BRIDGESTONE SPORTS CO., LTD. Patent applications |
Patent application number | Title | Published |
20160074710 | GOLF BALL - The invention provides a golf ball having a core and a cover of one layer or a plurality of layers, the core being formed of a material molded under heat from a rubber composition which includes (A) a base rubber, (B) an organic peroxide, and (C) water and/or a metal monocarboxylate. The product P×E of the difference P (mol/m | 03-17-2016 |
20150379388 | GOLF BALL INCORPORATING IC CHIP - A golf ball includes an RFID tag provided with an IC chip and an antenna. A protective layer surrounds the outer periphery of the RFID tag. A core surrounds the outer periphery of the protective layer. A cover surrounds the outer periphery of the core. The protective layer is formed by a material having a hardness equal to or more than 30 in Shore D. Further, the diameter of the protective layer is 3 to 30 millimeters, and the outer shape of the protective layer has an approximately spherical shape. | 12-31-2015 |
20150375050 | GOLF BALL AND METHOD OF MANUFACTURE - In a golf ball having a core and a cover of one or more layer encasing the core, an outermost layer of the cover is molded of a thermoplastic material selected from the group consisting of polyurethane, polyurea and mixtures thereof, and the surface of the cover is treated with a polyisocyanate compound that is free of organic solvent. A method of manufacturing the golf ball is also described. Such golf balls are endowed with an excellent spin performance and scuff resistance, in addition to which productivity of the golf balls is high. | 12-31-2015 |
20150375048 | GOLF BALL HAVING OVAL DIMPLES - A golf ball includes oval dimples arranged on the surface thereof. Each of the oval dimples has a long diameter DL and a short diameter DS in a planar shape thereof, a relationship between the long diameter and the short diameter being defined as a following formula (1). | 12-31-2015 |
20150368452 | GOLF BALL MATERIAL AND GOLF BALL - A golf ball material includes (A) one, two or more resin ingredients selected from among olefin-unsaturated carboxylic acid random copolymers, olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester random copolymers, and metal ion neutralization products of these copolymers, (B) one two or more resin ingredients selected from among polyethylenes, ethylene-vinyl acetate copolymers and polyesters, and (C) the specific agent for compatibilizing components (A) and (B). | 12-24-2015 |
20150367178 | MULTI-PIECE SOLID GOLF BALL - In a multi-piece solid golf ball having a core formed of a center core encased by an envelope layer, a cover having a plurality of dimples on its surface, and one or more intermediate layer disposed between the core and the cover, the center core and the envelope layer are each made of an elastic material, the radius r (mm) of the center core satisfies the condition 5≦r≦15, and the core has a cross-sectional hardness profile that satisfies specific conditions. This golf ball has an increased distance and a soft feel at impact, and also is able to prevent a decline in the durability to cracking. | 12-24-2015 |
20150360099 | GOLF CLUB HEAD - A golf club head of this invention includes a face portion, first and second interchangeable members, a first attachment portion from which the first and second interchangeable members are detachable, and a second attachment portion from which the first and second interchangeable members are detachable. The first interchangeable member is a reinforcing member that abuts against the rear surface of the face portion and restricts deformation of an abutment portion when the member is attached to the first attachment portion. The second interchangeable member is a member that does not abut against the rear surface of the face portion when the member is attached to the first attachment portion. | 12-17-2015 |
20150360091 | GOLF CLUB HEAD - A golf club head of this invention is a wood type golf club head including a face portion, a crown portion, and a sole portion. A plurality of grooves arrayed in the vertical direction of the face portion are formed in the face portion. The depth of the plurality of grooves is less than 0.025 mm. When pitches between, out of the plurality of grooves, grooves adjacent in the vertical direction of the face portion are represented by P | 12-17-2015 |
20150352416 | GOLF CLUB AND SHAFT - The present invention provides a golf club shaft. The shaft is made of a fiber reinforced resin. When a position 100 mm apart from a distal end of the shaft is represented by P | 12-10-2015 |
20150352413 | GOLF CLUB HEAD MANUFACTURING METHOD - A method for manufacturing golf club head includes: preparing a head blank for an iron type golf club head, the head blank having a recess serving as a measure of polishing or grinding at least in a portion of a sole part of the head blank; and polishing or grinding the head blank according to the recess. | 12-10-2015 |
20150306468 | CONTACT STATE OBSERVATION APPARATUS OF GOLF BALL AND CONTACT STATE OBSERVATION METHOD OF GOLF BALL - A contact state observation apparatus of golf ball can observe the contact phenomenon between a golf ball and a golf club which has been conventionally hidden and unobservable. The contact state observation apparatus of golf ball includes: launching means for launching a golf ball | 10-29-2015 |
20150258388 | MULTI-PIECE SOLID GOLF BALL - In a multi-piece solid golf ball having a core, an intermediate layer and a cover, the ball and the intermediate layer have respective surface hardnesses which are set so as to satisfy a specific relationship. Also, the respective initial velocities measured for the core, a sphere composed of the core over which an envelope layer and the intermediate layer have been formed (intermediate layer-encased sphere) and the ball are set so as to satisfy a specific relationship. In addition, the hardness relationship between the surface and the center of the core has been adjusted in a specific range. This golf ball is able to exhibit an excellent flight performance not only when struck by mid head-speed golfers, but even when struck by low head-speed golfers, in addition to which it has both a good feel at impact and an excellent durability to repeated impact. | 09-17-2015 |
20150133234 | GOLF CLUB HEAD - A golf club head of this invention includes a sole portion and a face portion. The golf club head includes a metal member that forms the face portion. The surface of the metal member includes a plurality of score lines, and undulations continuously formed in the up-down direction of the face portion. The pitch between adjacent apexes of the undulations exceeds 3 mm. The score lines are formed at the apexes of the undulations. | 05-14-2015 |
20150119162 | GOLF CLUB - A golf club includes a shaft; a head mounted to the tip end of the shaft; a grip mounted to the butt end of the shaft; a first vibration damping member arranged on the head side of the shaft; and a second vibration damping member arranged on the grip side of the shaft. The first range of the shaft in which the first vibration damping member is arranged includes a position of the shaft corresponding to the top end of the hosel of the head and has a length of 25 to 250 mm in the longitudinal direction of the shaft. The second range of the shaft in which the second vibration damping member is arranged includes a position of the shaft corresponding to the tip end of the grip and has a length of 150 to 250 mm in the longitudinal direction of the shaft. | 04-30-2015 |
20150102521 | GOLF BALL MANUFACTURING METHOD - A method of manufacturing golf balls having a core and a cover of at least one layer encasing the core includes, when molding the cover, blending a thermal antioxidant into the cover stock in a plurality of divided portions. This method is able to minimize deterioration and discoloration of the cover stock, enabling golf balls of stable quality to be obtained. In addition, it is able to facilitate the use of reclaimed material, enabling environmentally and economically efficient production to be carried out. | 04-16-2015 |
20150065268 | GOLF BALL - The invention provides a golf ball having a core and a cover of one layer or a plurality of layers, the core being formed of a material molded under heat from a rubber composition which includes (A) a base rubber, (B) an organic peroxide, and (C) water and/or a metal monocarboxylate. The product P×E of the difference P (mol/m | 03-05-2015 |
20150038266 | MULTI-PIECE SOLID GOLF BALL - In a multi-piece solid golf ball having a core with a two-layer construction consisting of an inner layer and an outer layer and having also, over the core, a cover of two or more layers that includes an intermediate layer and an outermost layer, the core inner layer is formed primarily of a specific thermoplastic elastomer, the core outer layer is formed of a rubber material, and both the hardness relationship between the core inner layer and the core outer layer and the hardness relationship between the intermediate layer and the outermost layer are optimized. This golf ball allows even amateur golfers who do not have a high head speed to impart sufficient deformation to the ball and thus achieve an excellent flight performance and a comfortable feel at impact, and also has an excellent durability. | 02-05-2015 |
20150038249 | SYSTEM, METHOD, AND APPARATUS FOR MEASURING GOLF CLUB DEFORMATION - Provided is a system for measuring golf club deformation that can easily measure golf club deformation during a golfer's golf swing as usual. A measurement system ( | 02-05-2015 |
20150018125 | MULTI-PIECE SOLID GOLF BALL - In a multi-piece solid golf ball which has a core with a two-layer structure composed of an inner layer and an outer layer, and has over the core a cover of two or more layers that includes an intermediate layer and an outermost layer, the core inner layer is formed primarily of a specific thermoplastic elastomer, the core outer layer is formed of a rubber composition consisting primarily of a rubber material, and the hardness relationship between the core inner layer and the core outer layer and the hardness relationship between the intermediate layer and the outermost layer have been optimized. This golf ball has an excellent flight performance on full shots with a driver (W#1) and also has good controllability in the short game and a good durability. | 01-15-2015 |
20140371004 | SOLID GOLF BALL - The invention provides a solid golf ball which has a core of at least one layer and a cover of at least one layer. At least one layer of the core is formed primarily of polybutadiene and includes at least 0.05 part by weight of a polyurethane resin powder having an average particle size of not more than 2 mm per 100 parts by weight of rubber component. At least one layer of the cover is formed primarily of polyurethane. | 12-18-2014 |
20140357427 | SELECTION SUPPORT APPARATUS AND SELECTION SUPPORT METHOD - A selection support apparatus acquires a plurality of types of characteristic data representing a swing characteristic of a testing golfer based on a test shot result of a golf club. The apparatus calculates each of recommended values for the testing golfer in association with a plurality of types of characteristic values that characterize a component of a golf club based on the plurality of types of characteristic data. The apparatus selects, based on the recommended values and component information representing a correspondence between components and the plurality of types of characteristic values, a recommended component from components listed in the component information. | 12-04-2014 |
20140357426 | SELECTION SUPPORT APPARATUS AND SELECTION SUPPORT METHOD - A selection support apparatus acquires a plurality of types of characteristic data representing a swing characteristic of a testing golfer based on a test shot result of a golf club. The apparatus determines a swing type of the testing golfer out of swing types classified in advance based on at least one of the plurality of types of characteristic data. The apparatus calculates a recommended value for the testing golfer in association with a characteristic value that characterizes a component of a golf club based on at least one of the plurality of types of characteristic data. The apparatus selects, based on the swing type of the testing golfer, the recommended value, and component information representing a correspondence between components, the swing types, and the characteristic value, a recommended component from the components listed in the component information. | 12-04-2014 |
20140357393 | GOLF SWING CLASSIFICATION METHOD, GOLF CLUB SELECTION METHOD, GOLF SWING CLASSIFICATION DEVICE, AND GOLF SWING CLASSIFICATION SYSTEM - Provided is a golf swing classification method that is capable of optimizing selection of a golf club. A golf swing classification method when a golf club hits a golf ball according to the present invention includes the steps of: acquiring acceleration in at least a single point on the golf club or in at least one point that follows the single point during the golf swing; and mapping a behavior of the golf club based on a time period from a time point when an absolute value of the acceleration is at a maximum to a time point when the golf club hits the golf ball. | 12-04-2014 |
20140335974 | MULTI-PIECE SOLID GOLF BALL - A multi-piece solid golf ball has a core, an envelope layer encasing the core, an intermediate layer encasing the envelope layer, and an outer layer which encases the envelope layer and has formed on a surface thereof a plurality of dimples. The core is made of an elastomer. The envelope layer is formed of an inner envelope layer and an outer envelope layer, and the intermediate layer is formed of an inner intermediate layer and an outer intermediate layer. Letting the average hardness of the core be expressed by the following formula: average core hardness (Shore D)=[core surface hardness (Shore D)+core center hardness (Shore D)]/2, the outer layer has a hardness (Shore D) which is higher than the average core hardness and each of the envelope layers and the intermediate layers is softer than the outer layer. | 11-13-2014 |
20140335973 | IRON TYPE GOLF CLUB HEAD - An iron type golf club head includes: a main body portion having a face surface and a sole surface; a backward bulging section provided at a lower back section of the main body portion, the bulging section including: an upper surface side recess formed to extend downward from the upper surface of the backward bulging section; and a lower surface side recess formed to extend upward from the lower surface of the backward bulging section; and a hosel portion connected to the main body portion, wherein the upper surface side recess and the lower surface side recess are overlapped at least in part with each other in the perspective side view of the head when viewed from the toe side of the iron type golf club head. | 11-13-2014 |
20140274472 | MULTI-PIECE SOLID GOLF BALL - A multi-piece solid golf ball has a core, an envelope layer encasing the core, an intermediate layer encasing the envelope layer, and a cover which encases the intermediate layer and has formed on a surface thereof a plurality of dimples. The envelope layer is formed of an inner envelope layer, an intermediate envelope layer and an outer envelope layer. The inner, intermediate and outer envelope layers, the intermediate layer and the cover are each formed primarily of a resin material which may be of the same or different types, and the core is formed primarily of a rubber material. The golf ball has an excellent flight performance and also excellent controllability in the short game. In addition, it has a good feel on impact and an excellent scuff resistance. | 09-18-2014 |
20140274466 | GOLF BALL - The invention provides a golf ball having a core encased by a cover of one or more layer, which cover is formed of a material composed primarily of a thermoplastic polyurethane material and containing also a lubricant composed primarily of a montanic acid ester. Paint film adhesion is not adversely affected even when the mold temperature during injection-molding of the golf ball is raised to 60° C. or above. | 09-18-2014 |
20140265022 | GOLF BALL MANUFACTURING METHOD - This invention provides a method of manufacturing a golf ball composed of a core encased by a cover of at least one layer using an injection mold. The method includes the step of using, as a cover-forming material, a resin composition which is composed primarily of a thermoplastic polyurethane material and includes a lubricant composed primarily of a montanic acid ester, and also controlling the mold temperature of the injection mold within the range of 30 to 60° C.; and the step of injection-molding the resin composition over the core with the injection mold controlled to the foregoing mold temperature. | 09-18-2014 |
20140265017 | GOLF BALL MANUFACTURING METHOD - The invention provides a method of manufacturing golf balls by drying blending:
| 09-18-2014 |
20140256470 | MULTI-PIECE SOLID GOLF BALL - A multi-piece solid golf ball comprising a core, an envelope layer encasing the core, an intermediate layer encasing the envelope layer, and a cover which encases the intermediate layer and has formed on a surface thereof a plurality of dimples, wherein the core is made primarily of a rubber material and has a diameter of at least 31 mm, the envelope layer and intermediate layer are each made primarily of the same or different resin materials and the cover is made primarily of polyurethane; intermediate layer and cover have an optimized thickness relationship; the core, envelope layer, intermediate layer and cover have optimized hardness relationships; and the core surface and core center have a large hardness difference therebetween. The golf ball has excellent flight performance and controllability acceptable to professionals and other skilled golfers, while also having excellent durability to cracking upon repeated impact and excellent scuff resistance. | 09-11-2014 |
20140200100 | GOLF BALL - In a golf ball having a core and a cover of at least one layer, an outermost layer of the cover is formed to a specific thickness using a resin composition containing a light-harvesting fluorescent dye and a light-reflecting pigment. The golf ball is elegant and highly stylish, and moreover has an excellent visibility. | 07-17-2014 |
20140194221 | MULTI-PIECE SOLID GOLF BALL - A golf ball has a core, an envelope layer, an intermediate layer and a cover whose respective surface hardnesses have been set so as to satisfy certain specific relationships. In addition, the respective initial velocities measured for the core, a sphere composed of the core peripherally covered by the envelope layer (envelope layer-encased sphere), a sphere composed of the core peripherally covered by the envelope layer and the intermediate layer (intermediate layer-encased sphere), and the ball itself have been set so as to satisfy certain specific relationships. This golf ball is able to exhibit an excellent flight performance not only when struck by mid head-speed golfers, but even when struck by low head-speed golfers, in addition to which it also has a good feel at impact and an excellent durability to repeated impact. | 07-10-2014 |
20140187357 | GOLF BALL - The present invention, by forming the outermost layer of a golf ball cover from a specific resin composition that includes a thermoplastic resin and a color masterbatch having mutually similar specific gravities, provides a golf ball which is imparted with an excellent durability of markings thereon, a uniform and evenly colored appearance, and an excellent manufacturability. | 07-03-2014 |
20140187353 | MULTI-PIECE SOLID GOLF BALL - A multi-piece solid golf ball has a core, at least one intermediate layer and an outer layer. The core is formed of a single layer or of two or more layers. The interior hardness profile of the core is set in a specific range, and the relationship between the compressive deformations of the core and the golf ball under given loadings is set in a specific range. The outer layer is formed primarily of a thermoplastic polyurethane material, and has a material hardness that is set in a specific range. | 07-03-2014 |
20140187351 | MULTI-PIECE SOLID GOLF BALL - A multi-piece solid golf ball has a core, at least one intermediate layer and an outer layer. The core is formed of a single layer or of two or more layers. The interior hardness profile of the core is set in a specific range, and the relationship between the compressive deformations of the core and the golf ball under given loadings is set in a specific range. The outer layer is formed primarily of a thermoplastic polyurethane material, and has a material hardness that is set in a specific range. | 07-03-2014 |
20140187350 | GOLF BALL COMPOSITION AND GOLF BALL - The invention provides a golf ball composition containing an ionomer resin composition of: (A) one or more ionomer selected from the group consisting of an olefin-unsaturated carboxylic acid random copolymer and/or an olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester random copolymer, and a metal ion neutralization product of an olefin-unsaturated carboxylic acid random copolymer and/or a metal ion neutralization product of an olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester random copolymer; (B) a polyethylene; and (C) an organic peroxide. | 07-03-2014 |
20140187349 | GOLF BALL COMPOSITION AND GOLF BALL - The invention provides a golf ball composition containing an ionomer resin composition of: (A) one or more ionomer selected from the group consisting of an olefin-unsaturated carboxylic acid random copolymer and/or an olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester random copolymer, and a metal ion neutralization product of an olefin-unsaturated carboxylic acid random copolymer and/or a metal ion neutralization product of an olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester random copolymer; (B) a polyethylene; and (C) an organic peroxide. | 07-03-2014 |
20140185867 | ANALYSIS SYSTEM AND ANALYSIS METHOD - An object of the present invention is to enable accurate classification of golf swings. A data processing apparatus computes a state of motion of a golf ball on the basis of still images captured by an imaging unit. The data processing apparatus divides a golf swing identified by swing data acquired during a golf swing by a player into golf swing paths of a back swing, a down swing and a follow through, assigns a path in two-dimensional coordinates having a vertical axis and a horizontal axis to any two of these three golf swing paths, calculates an angle formed between the golf swing path and the horizontal axis, for each of the two golf swing paths, and classifies the golf swing on the basis of an angular difference between the respective angles thus calculated. The present invention can be applied to, for example, an analysis system for analyzing a golf swing. | 07-03-2014 |
20140175699 | MOLD FOR INJECTION-MOLDING A GOLF BALL, AND GOLF BALL MANUFACTUING METHOD - The invention provides a mold for injection-molding a golf ball, which mold has a cavity inner wall with a vertical diameter connecting both poles in a vertical direction thereof that is longer than a horizontal diameter connecting both poles in a horizontal direction thereof. A method of manufacturing golf balls using such a mold is also provided. The use of this mold eliminates molding problems that arise when molding the outermost cover layer of a golf ball, enabling the cover to be stably molded and also making it possible to easily and reliably obtain golf balls of high symmetry in which a cover of uniform thickness has been formed. | 06-26-2014 |
20140171222 | MULTI-PIECE SOLID GOLF BALL - In a multi-piece solid golf ball having a core, at least one intermediate layer encasing the core and a cover of at least one layer encasing the intermediate layer, each intermediate layer is formed primarily of a resin material and each layer of the cover is formed primarily of an ionomer resin. The cover has a Shore D material hardness of not more than 58, and the material hardness of the cover is higher than the material hardness of the intermediate layer. The intermediate layer and the cover have a combined thickness of not more than 2.1 mm. The cover has a smaller thickness than the intermediate layer, the ratio (a)/(b) of the cover thickness (a) to the intermediate layer thickness (b) being at least 0.5 and less than 1.0. | 06-19-2014 |
20140171221 | MULTI-PIECE SOLID GOLF BALL - In a multi-piece solid golf ball having a core, at least one intermediate layer encasing the core and a cover of at least one layer encasing the intermediate layer, each intermediate layer is formed primarily of a resin material and each layer of the cover is formed primarily of an ionomer resin. The intermediate layer has a Shore D material hardness of not more than 50 and the cover has a Shore D material hardness greater than 60, the material hardness of the cover being higher than the material hardness of the intermediate layer. The intermediate layer and the cover have a total thickness of not more than 2.2 mm. The cover has a larger thickness than the intermediate layer, the ratio (a)/(b) of the cover thickness (a) to the intermediate layer thickness (b) being at least 1.1 and not more than 2.0. | 06-19-2014 |
20140162806 | GOLF CLUB AND METHOD FOR ADJUSTING CHARACTERISTICS OF THE SAME - A golf club includes: a shaft; a head; and a shaft case, and a hosel column wherein: a threaded ring including a plurality of threads provided on an inner periphery of an inner hole of the threaded ring is provided on an upper side of a dividing member, the threads extending in an axis center direction of the inner hole; the shaft case includes a convex axis member provided at a top end of the shaft case; the convex axis member is inserted in the inner hole of the threaded ring, and any one of corner edges of the convex axis member and the convex threads connect with the threads of the threaded ring; and a bolt that is inserted into a bolt insertion hole provided to the dividing member from a sole side of the head is screwed into the shaft case. | 06-12-2014 |
20140162805 | GOLF CLUB AND METHOD FOR ADJUSTING CHARACTERISTICS OF THE SAME - A golf club includes: a shaft; a head; and a shaft case, a hosel column, wherein: the shaft case includes a convex axis member provided at a top end of the shaft case; the hosel column includes a plurality of concave threads that are provided on the lower side of a step face on an inner periphery of the hosel column; a flange member is provided at a back end of the shaft case, and a spacer is provided insertable and removable between the flange member and an upper end of the hosel column; a bolt holder is arranged to connect with the step face when the spacer is inserted between the flange member of the shaft case and the hosel column; and the bolt holder is arranged to connect with the upper ends of the concave threads when the spacer is removed. | 06-12-2014 |
20140155193 | GOLF CLUB HEAD - A golf club head includes: a face portion; a crown portion, furrows being formed on an interior surface of at least a part of the crown part in a mesh-like pattern; a side portion; a sole portion, at least a front part of the sole portion being made of metal, and furrows being formed on an interior surface of at least a part of the front part in a mesh-like pattern; and a hosel portion. | 06-05-2014 |
20140100059 | GOLF BALL - The invention provides a golf ball having a core and ah cover of at least one layer. The core has a cross-sectional hardness which, letting R (mm) be the radius of the core, A be the JIS-C hardness at a center of the core, B be the JIS-C hardness at a position R/3 mm from the core center, C be the JIS-C hardness at a position R/1.8 mm from the core center, D be the JIS-C hardness at a position R/1.3 mm from the core center, and E be the JIS-C hardness at a surface of the core, satisfies the formulas (1) D−C≧7, (2) C−B≦7, (3) (D−C)−(C−B)≧7, and (4) E−A≧16. | 04-10-2014 |
20140073461 | GOLF BALL - The invention provides a golf ball endowed with an improved distance and durability. The ball has a core and a cover, the core being formed of a rubber composition containing a base rubber, a co-crosslinking agent, a crosslinking initiator, a metal oxide and an organosulfur compound. The co-crosslinking agent is methacrylic acid, the metal oxide is zinc oxide, and the rubber composition contains the crosslinking initiator in an amount of from 1.2 to 5 parts by weight per 100 parts by weight of the base rubber. The finished ball has an initial velocity of at least 74.3 m/s. | 03-13-2014 |
20140073460 | GOLF BALL - The invention provides a golf ball endowed with an improved distance and durability. The ball has a core and a cover, the core being formed of a rubber composition containing a base rubber, a co-crosslinking agent, a crosslinking initiator and a metal oxide. The base rubber is a mixture of (A) polybutadiene with (B) styrene-butadiene rubber and/or isoprene rubber, the co-crosslinking agent is methacrylic acid, and the metal oxide is zinc oxide. The rubber composition contains the crosslinking initiator in an amount of from 1.2 to 5 parts by weight per 100 parts by weight of the base rubber. | 03-13-2014 |
20140073455 | GOLF BALL - The invention provides a golf ball endowed with an improved distance and durability. The ball has a core and a cover, the core being formed of a rubber composition containing a base rubber, a co-crosslinking agent, a crosslinking initiator and a metal oxide. The co-crosslinking agent is methacrylic acid. The core has a hardness profile in which, letting (A) be the JIS-C hardness at the core surface, (B) be the JIS-C hardness at a position 2 mm in from the surface toward the center of the core, (C) be the JIS-C hardness at a position 5 mm in from the surface toward the center of the core, (D) be the JIS-C hardness at a position 10 mm in from the surface toward the center of the core, (E) be the JIS-C hardness at a position 15 mm in from the surface toward the center of the core, and (F) be the JIS-C hardness at the center of the core, (A) to (F) have specific hardnesses. | 03-13-2014 |
20140073454 | GOLF BALL MANUFACTURING METHOD AND GOLF BALL - The invention provides a method of manufacturing golf balls having covers of very high transparency, which method includes, prior to formation of the cover, a preformed body fabricating step wherein a temperature-responsive pigment that responds to a change in temperature by developing a color is included in or coated onto the preformed body. In this way, a preformed body that matches the cover to be formed can be easily and reliably identified from among a plurality of types of preformed bodies stored at a temporary storage place. The invention also provides golf balls having a construction suitable for carrying out such a manufacturing method. The invention enables golf balls of excellent visibility and stylishness to be efficiently produced. | 03-13-2014 |
20140073452 | GOLF BALL AND GOLF BALL MANUFACTURING METHOD - When manufacturing golf balls having a structural component which is a molded and vulcanized material obtained by vulcanizing a rubber composition containing, as the essential ingredients, a base rubber and an unsaturated carboxylic acid or a salt thereof, the distinguishability of structural components such as cores can be enhanced by including also a soluble pigment within, and thereby coloring, the rubber composition. Moreover, vulcanized rubber powder obtained by rendering processing scrap and waste from such cores into powder can be easily decolorized by liquid washing to remove the pigment, thus enabling advantageous use of the vulcanized rubber powder as a compounding ingredient in the manufacture of other golf ball cores without affecting the color tone of the manufactured balls. | 03-13-2014 |
20140051527 | GOLF CLUB, SHAFT INSERTION DEPTH CHANGING METHOD AND SHAFT REPLACING METHOD - A golf club includes: a shaft; a head mounted on the leading end of the shaft; and a shaft case having a substantially cylindrical shape and fixed to the leading end of the shaft and inserted into a hosel formed in the head, the shaft case being fixed to the head by a bolt inserted from the sole side of the head, wherein the shaft case includes a small-diameter cylindrical portion on the leading end side thereof and a key portion formed on the outer peripheral surface of the small-diameter cylindrical portion, and multiple slits having different depths and engageable with the key portion are formed in the deep portion of the inside of the hosel, whereby, by changing the slits engageable with the key portion, the insertion depth of the shaft case into the hosel can be changed. | 02-20-2014 |
20140024478 | GOLF BALL - The invention provides a golf ball with a surface having a plurality of dimples formed thereon. Some or all of the dimples on the ball surface have a cross-sectional shape in which, letting a straight line passing through any one edge of the dimple and a foot of a perpendicular (pedal) dropped from an imaginary plane defined by a peripheral edge of the dimple to a deepest point of the dimple serve as a reference line, and establishing a plurality of specific regions on the reference line from the dimple edge as 0% to the pedal as 100%, the average depths of the dimple from the reference line in the respective established regions satisfy specific conditions. By reducing the air resistance during flight and thus enhancing the aerodynamic performance, this golf ball achieves a higher trajectory, enabling the ball to travel further. | 01-23-2014 |
20140024477 | GOLF BALL - The invention provides a golf ball with a surface having a plurality of dimples formed thereon. Some or all of the dimples on the ball surface have a cross-sectional shape in which, letting a straight line passing through any one edge of the dimple and a foot of a perpendicular (pedal) dropped from an imaginary plane defined by a peripheral edge of the dimple to a deepest point of the dimple serve as a reference line, and establishing a plurality of specific regions on the reference line from the dimple edge as 0% to the pedal as 100%, the average depths of the dimple from the reference line in the respective established regions satisfy specific conditions. By reducing the air resistance during flight and thus enhancing the aerodynamic performance, this golf ball achieves a higher trajectory, enabling the ball to travel further. | 01-23-2014 |
20140018194 | GOLF BALL METHOD OF MANUFACTURE AND GOLF BALL - The invention provides a method of manufacturing golf balls which includes the step of printing specific markings on the surface of a golf ball by pad printing. Prior to the printing step, the surface of the ball is subjected to heat and pressure treatment. | 01-16-2014 |
20140018191 | MULTI-PIECE SOLID GOLF BALL - In a multi-piece solid golf ball having a core, an envelope layer, an intermediate layer and a cover, the core is formed primarily of a thermoplastic elastomer, the envelope layer is formed of a rubber composition containing primarily a rubber material, the intermediate layer is formed of a resin composition containing primarily an ionomer, and the cover is formed of a resin composition containing primarily a urethane. The relationships among the specific gravities and the surface hardnesses of the respective layers are optimized. This golf ball enables an increased distance on full shots with a driver and improved controllability in the short game to be achieved, and also makes it possible to obtain a further reduction in the spin rate on full shots. | 01-16-2014 |
20140018190 | MULTI-PIECE SOLID GOLF BALL - In a multi-piece solid golf ball having a core, an envelope layer, an intermediate layer and a cover, the core is formed primarily of a thermoplastic resin and has a diameter of from 20 to 30 mm, the envelope layer is formed of a rubber composition containing primarily a rubber material and has a thickness of from 3 to 10 mm, the intermediate layer is formed of a resin composition containing primarily an ionomer, and the cover is formed of a resin composition containing primarily a urethane. Both the relationship among the specific gravities of the core, the envelope layer and the intermediate layer, and the relationship among the surface hardnesses of the core, the envelope layer, the intermediate layer and the cover are optimized. | 01-16-2014 |
20140018189 | MULTI-PIECE SOLID GOLF BALL - A multi-piece solid golf ball having a core, an envelope layer, an intermediate layer and a cover. The core is formed primarily of a thermoplastic resin and has a diameter of from 20 to 30 mm, the envelope layer is formed of a rubber composition containing primarily a rubber material and has a thickness of from 3 to 10 mm, the intermediate layer is formed of a resin composition containing primarily an ionomer, and the cover is formed of a resin composition containing primarily a urethane. Both the relationship among the specific gravities of the core, the envelope layer and the intermediate layer, and the relationship among the surface hardnesses of the core, the envelope layer, the intermediate layer and the cover are optimized. | 01-16-2014 |
20130344987 | HOLLOW GOLF CLUB HEAD AND METHOD OF MANUFACTURING THE SAME - This invention provides a hollow golf club head including a metal plate portion provided with thin and thick portions. A medium thick portion having an intermediate thickness between the thicknesses of the thin and thick portions is formed at the boundary portion between the thin and thick portions. The thin and medium thick portions are formed by the steps of pressing the metal plate portion to form a recess in one surface of the metal plate portion and a projection on its other surface, performing chemical milling of the recess and a portion surrounding it, and removing the projection by grinding. | 12-26-2013 |
20130337931 | GOLF CLUB HEAD - This invention provides an iron golf club head comprising a face surface with a plurality of scorelines formed in it, and an indicating portion which indicates at least the cross-sectional shape of the scoreline. | 12-19-2013 |
20130324298 | GOLF CLUB HEAD - This invention provides a hollow golf club head including a face portion, a crown portion, a sole/side portion which includes a sole portion and a side portion, and a weight member. The golf club head includes a recessed portion which is formed in the sole/side portion, and has an outer surface to which the weight member is attached, and a rib which is formed on the inner surface of the sole/side portion, and traverses the recessed portion across the peripheral edge defining the recessed portion. | 12-05-2013 |
20130324296 | GOLF CLUB HEAD - This invention provides a golf club head which includes a face portion, and has a volume of 400 cc or more. When the golf club head is disposed on a horizontal plane at a specific lie angle while the face portion is matched with the flight trajectory direction, and images of the face portion and the golf club head are projected onto a vertical plane from the front side of the face portion upon defining the flight trajectory direction as the projection direction, the area of a projected figure H of the golf club head is defined as HA, and the area of a projected figure F of the face portion is defined as FA. The golf club head satisfies 0.512-05-2013 | |
20130303304 | GOLF CLUB HEAD - According to an aspect of this invention, a golf club head includes: a head main body; and a weight material detachably mounted in a weight material mounting portion in the head main body, an external screw thread on the weight material meshing with an internal screw thread in the weight material mounting portion, wherein: the weight material comprises a head portion having the external screw thread and a rod portion which projects from the head portion; and the internal screw thread is provided on an entrance side and a cylindrical portion is provided on a deeper side for engagement with the rod portion in the weight material mounting portion. | 11-14-2013 |
20130303303 | MANUFACTURING METHOD AND GOLF CLUB HEAD - This invention provides a method of manufacturing a golf club head including a face surface. This manufacturing method includes a step of forming a plurality of recessed portions in the face surface, included in a first member, to extend in the toe-to-heel direction, a fixing step of fixing, to the recessed portions, second members which are formed by a material different from that of the first member, and fill the recessed portions, and after the fixing step, a scoreline forming step of forming at least one scoreline in each of the second members, while not forming the scoreline in a portion, between the recessed portions, of the face surface of the first member. | 11-14-2013 |
20130296077 | GOLF BALL - The invention provides a golf ball having a core and a cover of at least one layer. The cover includes an outermost layer and at least one intermediate layer interposed between the outermost layer and the core. The core has a cross-sectional hardness which, letting R (mm) be the radius of the core, A be the JIS-C hardness at the center of the core, B be the JIS-C hardness at a position R/3 mm from the core center, C be the JIS-C hardness at a position R/1.8 mm from the core center, D be the JIS-C hardness at a position R/1.5 mm from the core center, and E be the JIS-C hardness at the surface of the core, satisfies formulas (1) B−A11-07-2013 | |
20130296076 | GOLF BALL - The invention provides a golf ball having a core and a cover of at least one layer. The core has a cross-sectional hardness which, letting R (mm) be the radius of the core, A be the JIS-C hardness at a center of the core, B be the JIS-C hardness at a position R/3 mm from the core center, C be the JIS-C hardness at a position R/1.8 mm from the core center, D be the JIS-C hardness at a position R/1.5 mm from the core center, and E be the JIS-C hardness at a surface of the core, satisfies the formulas (1) B−A11-07-2013 | |
20130296075 | GOLF BALL - The invention provides a golf ball having a core and a cover of at least one layer. The cover includes an outermost layer and at least one intermediate layer interposed between the outermost layer and the core. The core has a cross-sectional hardness which, letting R (mm) be the radius of the core, A be the JIS-C hardness at the center of the core, B be the JIS-C hardness at a position R/3 mm from the core center, C be the JIS-C hardness at a position R/1.8 mm from the core center, D be the JIS-C hardness at a position R/1.5 mm from the core center, and E be the JIS-C hardness at the surface of the core, satisfies formulas (1) B−A11-07-2013 | |
20130296074 | GOLF BALL - The invention provides a golf ball having a core and a cover of at least one layer. The core is formed of a rubber composition which includes a polybutadiene-containing base rubber, an unsaturated carboxylic acid and/or a metal salt thereof, an organic peroxide and sulfur, and for which the value of [sulfur (mol)÷available active oxygen content in organic peroxide] is at least 0.01 and not more than 0.019. | 11-07-2013 |
20130296073 | GOLF BALL - The invention provides a golf ball having a core and a cover of at least one layer. The core has a cross-sectional hardness which, letting D (mm) be the radius of the core, O be the JIS-C hardness at a center of the core, P be the JIS-C hardness at a position 25% of D from the core center, Q be the JIS-C hardness at a position 55% of D mm from the core center, and T be the JIS-C hardness at a position 85% of D from the core center, satisfies the formulas (1) P−O≦4, (2) Q−O≦5, and (3) T−Q≧10. | 11-07-2013 |
20130296072 | GOLF BALL - The invention provides a golf ball having a core and a cover of at least one layer. The core has a cross-sectional hardness which, letting (H | 11-07-2013 |
20130296068 | GOLF CLUB - According to an aspect of this invention, a golf club includes: a shaft; a head attached to a distal end of the shaft; a substantially cylindrical shaft case is secured to the distal end of the shaft; the shaft case is inserted into a hosel hole in the head; and the shaft case is fixed to the head by a bolt which is inserted from a sole side of the head, wherein: a stopper member is attached to an outer circumference of the shaft case so that an attaching position can be changed; the stopper member is in abutment with an upper end portion of a hosel; and an inserting depth of the shaft case into the hosel hole can be changed by changing the attaching position of the stopper member. | 11-07-2013 |
20130281226 | FORMING METHOD AND GOLF CLUB HEAD - This invention provides a method of forming a fine groove with a width smaller than that of a scoreline in a golf club head. The method according to this invention includes a first step of forming a base groove in a face surface as a base of the fine groove, and a second step of forming a recess in at least one side wall of the base groove to reduce the angle between this side wall and the face surface. | 10-24-2013 |
20130274032 | GOLF BALL - The invention provides, in a golf ball having a core, an intermediate layer and a cover, a golf ball which combines an intermediate layer formed of an ionomer resin material having a high degree of neutralization with a cover formed of a material that includes a first ionomer resin having a high unsaturated carboxylic acid content and a second ionomer resin having a low unsaturated carboxylic acid content. The golf ball is able to achieve a lower spin rate on full shots with a driver (W#1) without reducing the spin performance on approach shots in the short game, provides high levels of both flight performance and controllability, and also has a good feel at impact. | 10-17-2013 |
20130268254 | SWING SIMULATION SYSTEM, SWING SIMULATION APPARATUS, AND SWING SIMULATION METHOD - Provided is a swing simulation system capable of simulating a swing without amplifying errors contained in measured values on three-dimensional coordinates of a grip during the swing. The simulation system according to the present invention includes: at least two imaging devices for imaging identification features capable of identifying a closed virtual plane that follows a grip of a golf club during a swing; and a simulation apparatus for simulating a behavior of the golf club during the swing, based on position information on the virtual plane. | 10-10-2013 |
20130267347 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball having a solid core with a spherical first layer, a second layer encasing the first layer and a third layer encasing the second layer, and having also an intermediate layer and a cover which encase the solid core. The first to third layers of the solid core are each respectively formed of a rubber composition. The ball has optimized relationships among the cross-sectional hardness at the center of the first layer obtained by cutting the solid core in half, the surface hardnesses of the first to third layers, and the respective hardnesses of the intermediate layer and the cover. The golf ball has an increased distance on full shots with a driver and an improved controllability in the short game, and on full shots also confers an agreeable feel at impact characterized by a solid sensation that includes a soft touch. | 10-10-2013 |
20130260911 | GOLF CLUB SHAFT AND GOLF CLUB - A golf club shaft is formed by curing wound fiber-containing prepregs and has a tip side and a butt side. In an embodiment, the prepregs include pitch-based carbon fiber-containing prepregs with a low elastic modulus, which are wound on the tip side, and polyacrylonitrile (PAN) based carbon fiber-containing prepregs, which are wound in an outermost layer on the tip side. In another embodiment, the prepregs include low-elasticity carbon fiber-containing prepregs wound on the tip side, and high-elasticity carbon fiber-containing prepregs wound on the butt side. In yet another embodiment, the prepregs include low-elasticity carbon-containing prepregs, which are wound on the butt side, and high elasticity carbon-containing prepregs, which are wound on the tip side. | 10-03-2013 |
20130260910 | GOLF CLUB - A golf club includes a shaft and a head. The shaft has a torque of the entire length of the shaft of from 3 to 5°. In the torsional rigidity distribution of the shaft, an integrated value of the torsional rigidity on the grip end side of the shaft is at least 85% of the integrated value of the torsional rigidity of the entire length of the shaft. The head has a distance to the center of gravity of from 25 mm to 35 mm and has a gravity center angle of from 10° to 20°. | 10-03-2013 |
20130252765 | COLOR GOLF BALL - A colored golf ball satisfies the following conditions:
| 09-26-2013 |
20130237345 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball having a solid core encased by a cover of one, two or more layers, which ball has specific hardness relationships among various areas on a core cross-section obtained by cutting the solid core in half. The golf ball has a reduced spin rate on shots with a driver (W#1) and thus is able to achieve an increased distance. A good feel on impact can also be obtained. | 09-12-2013 |
20130237344 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball having a solid core encased by a cover of one, two or more layers, which ball has specific hardness relationships among various areas on a core cross-section obtained by cutting the solid core in half. The golf ball has both a reduced spin rate and a good initial velocity on shots, particularly when struck in a high head-speed range, and thus is able to achieve an increased distance. A good feel on impact can also be obtained. | 09-12-2013 |
20130225333 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball having a solid core, an inner cover layer and an outer cover layer, which outer cover layer has numerous dimples on a surface thereof. The ball is characterized by combining an inner cover layer and an outer cover layer that are each formed to specific material hardnesses and thicknesses with dimples which satisfy specific conditions. This multi-piece solid golf ball is able to substantially reduce the distance traveled by the ball when struck at a high head speed, while at the same time holding down the decrease in distance when struck at a low head speed. | 08-29-2013 |
20130225327 | GOLF BALL - The invention provides a multi-piece solid golf ball having a core of at least one layer, a cover of at least two layers which includes an inner cover layer and an outermost cover layer, and a plurality of dimples formed on a surface of the ball. The thickness and Shore D hardness of the outermost cover layer are set in specific ranges, the thickness and Shore D hardness of the inner cover layer are set in specific ranges, and the ball surface has, as expressed in the Lab color system defined by JIS Z-8730, a lightness L value of at least 89, an a value of at least 2 but not more than 10, and a b value of −20 or above. The multi-piece solid golf ball of the invention increases the reddish coloring of a white golf ball, thereby enhancing the stylishness of the ball and improving the way the ball looks and feels to the golfer when it is played. | 08-29-2013 |
20130217516 | GOLF BALL - A golf ball of the present invention includes: a core located in the center of the golf ball; a cover which surrounds the outside of the core and has a plurality of dimples on the surface thereof; and a coating layer located between the core and the cover. The coating layer is formed of a material having rubber elasticity. The μ hardness of the golf ball is preferred to be approximately 3.0 or more and the cover is preferred to have a hardness of approximately 50 or more in terms of Shore D hardness. The intermediate layer is preferred to have a hardness of approximately 40 to approximately 65 in terms of Shore D hardness, and the hardness of the cover is preferred to be higher than the hardness of the intermediate layer. | 08-22-2013 |
20130197138 | RUBBER COMPOSITION FOR GOLF BALL - Rubber composition for golf balls which includes: (A) a base rubber containing a polybutadiene having a cis-1,4 bond content of at least 60 wt %; (B) an unsaturated carboxylic acid and/or a metal salt thereof; (C) an anthranilic acid derivative of the general formula | 08-01-2013 |
20130196792 | SYSTEM FOR PROVIDING INFORMATION ON PLAYING GOLF - A system for providing information on playing golf includes: an input unit; a processing unit that receives input information from the input unit and calculates output information concerning playing golf; and a display unit portable by a golf player that displays the output information. The input information may be a current position of a golf ball of the golf player. The golf ball may include an RFID system storing information concerning the golf ball. The input unit may include a reading unit for reading the information stored in the RFID system without any contact from the golf ball, and the information read by the reading unit is shown on the display unit. The system may include a data receiver that receives information dispatched by other player via a network. The system may include a data transmitter that transmits information dispatched by the golf player via a network. | 08-01-2013 |
20130196790 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball having a solid core, an inner cover layer and an outer cover layer, which outer cover layer has numerous dimples on a surface thereof. The ball is characterized both in that the core and the inner cover layer are formed so as to have a specific deflection ratio therebetween, and also by the combination of an inner cover layer formed to a specific material hardness and thickness, an outer cover layer formed to a specific material hardness, and dimples which satisfy specific conditions. This multi-piece solid golf ball is able to substantially reduce the distance traveled by the ball when struck at a high head speed, while at the same time holding down the decrease in distance when struck at a low head speed. | 08-01-2013 |
20130196788 | GOLF BALL WITH RFID SYSTEM - A golf ball has a radio-frequency identification (RFID) circuit for storing ID information therein, the RFID circuit formed of conductive ink; and an antenna for communicating by using radio frequency signals, the antenna connected to the RFID circuit. The antenna may be formed of conductive ink or paste. The RFID circuit and the antenna may be formed on the surface of the golf ball. The golf ball may further include a core layer, a cover layer disposed on the outside of the core layer, and optionally, an intermediate layer disposed between the core layer and the cover layer. The core or intermediate layer has a groove on the surface thereof, and the RFID circuit and the antenna may be formed within the groove. | 08-01-2013 |
20130196785 | GOLF CLUB HEAD - This invention provides a golf club head to which a damping member is attached. The damping member is formed by combining a plurality of materials including at least a resin material and a damping alloy. Alternatively, the damping member is formed by combining a plurality of materials including at least a resin material and a magnetic material. | 08-01-2013 |
20130172461 | RUBBER COMPOSITION FOR GOLF BALL - The invention provides a rubber composition for golf balls which includes: (A) a base rubber containing a polybutadiene having a cis-1,4 bond content of at least 60 wt %; (B) an unsaturated carboxylic acid and/or a metal salt thereof; (C) an anthranilic acid derivative of the general formula | 07-04-2013 |
20130172120 | SOLID GOLF BALL - The invention provides a solid golf ball which has a core of at least one layer and a cover of at least one layer. At least one layer of the core is formed primarily of polybutadiene and includes at least 0.05 part by weight each of (I) a rubber powder obtained by granulating a rubber material containing methacrylic acid or a metal salt thereof and (II) a polyurethane resin powder per 100 parts by weight of rubber component. At least one layer of the cover is formed primarily of polyurethane. | 07-04-2013 |
20130172119 | SOLID GOLF BALL - The invention provides a solid golf ball which has a core of at least one layer and a cover of at least one layer. At least one layer of the core is formed primarily of polybutadiene and includes at least 0.05 part by weight each of (I) a rubber powder obtained by granulating a rubber material containing acrylic acid or a metal salt of acrylic acid and (II) a polyurethane resin powder per 100 parts by weight of rubber component. At least one layer of the cover is formed primarily of polyurethane. | 07-04-2013 |
20130172108 | SOLID GOLF BALL - The invention provides a solid golf ball having a core and a cover. The core is formed of a rubber composition containing a base rubber, a co-crosslinking agent, a crosslinking initiator and a metal oxide. The base rubber contains polybutadiene, a styrene-butadiene rubber and, optionally, an isoprene rubber. The co-crosslinking agent is methacrylic acid, and the rubber composition includes a specific waste material in the form of a powder. The core deflection and the cover material are optimized. Utilizing a waste material in a solid golf ball conserves resources and thus is beneficial to the global environment. Even during prolonged use, the golf ball maintains its basic performance attributes (feel, flight, durability) at a high level. | 07-04-2013 |
20130172107 | SOLID GOLF BALL - The invention provides a solid golf ball having a core and a cover. The core is formed of a rubber composition containing a base rubber, a co-crosslinking agent, a crosslinking initiator and a metal oxide. The co-crosslinking agent is methacrylic acid, and the rubber composition includes a specific waste material in the form of a powder. The core deflection and the cover material are optimized. Utilizing a waste material in a solid golf ball conserves resources and thus is beneficial to the global environment. Even during prolonged use, the golf ball maintains its basic performance attributes (feel, flight, durability) at a high level. | 07-04-2013 |
20130172106 | SOLID GOLF BALL - The invention provides a solid golf ball which has a core of at least one layer and a cover of at least one layer. At least one layer of the core is formed primarily of polybutadiene and includes at least 0.05 part by weight each of (I) a rubber powder obtained by granulating a rubber material containing acrylic acid or a metal salt of acrylic acid and (II) a polyurethane resin powder per 100 parts by weight of rubber component. At least one layer of the cover is formed primarily of polyurethane. | 07-04-2013 |
20130165268 | GOLF BALL MANUFACTURING METHOD AND GOLF BALL - A method of manufacturing golf balls having a solid core formed of a rubber composition and a cover of one or more layer encasing the core is disclosed. The method includes the steps of forming a solid core, treating a surface of the core with an aqueous solution containing a haloisocyanuric acid and/or a metal salt thereof, washing the surface of the surface-treated core, and covering the washed surface of the core with a cover material. The manufacturing method lowers the burden on the environment, and the golf balls thus obtained have a good feel when struck, a good scuff resistance and a high durability to impact. | 06-27-2013 |
20130158204 | RUBBER COMPOSITION FOR GOLF BALLS, AND METHOD OF MANUFACTURING GOLF BALLS - One-piece golf balls or golf ball cores are obtained by molding and vulcanizing a rubber composition which includes (A) a polybutadiene-containing base rubber and (B) methacrylic acid. By including in the rubber composition (C) from 0.1 to 0.5 part by weight of a maleimide per 100 parts by weight of component A, the vulcanization time during molding and vulcanization is shortened, which enhances productivity without altering the performance and properties of the molded and vulcanized material. | 06-20-2013 |
20130157784 | GOLF BALL - A golf ball of the present invention includes: a core located in the center of the golf ball; a cover surrounding the outside of the core and having plural dimples on the surface thereof; a paint layer surrounding the outside of the cover; and a top coat further surrounding the outside of the paint layer. The paint layer is formed of a material having rubber elasticity. The top coat may have a thickness of at most approximately 60 μm. A material for forming the paint layer has a first loss tangent, a material for forming the cover has a second loss tangent, and a difference Td between the first loss tangent and the second loss tangent may be at least approximately 0.05. | 06-20-2013 |
20130157783 | GOLF BALL - A golf ball of the present invention includes: a core located in the center of the golf ball; a cover surrounding the outside of the core and having plural dimples on the surface thereof; and a paint layer surrounding the outside of the cover. The paint layer is formed of a material having rubber elasticity. When the golf ball has a μ hardness and the paint layer has a JIS-C hardness, a ratio Sp of the JIS-C hardness of the paint layer with respect to the μ hardness of the golf ball is at most approximately 15. When the cover has a Shore D hardness, a ratio Sc of the Shore D hardness of the cover with respect to the μ hardness of the golf ball may be at most approximately 25. | 06-20-2013 |
20130157782 | GOLF BALL - A golf ball of the present invention includes: a core located in the center of the golf ball; a cover surrounding the outside of the core and having plural dimples on the surface thereof; and a paint layer surrounding the outside of the cover. The paint layer is formed of a material having rubber elasticity. The paint layer may have a thickness of at most approximately 100 μm. The paint layer may have a hardness of at most approximately 70 in terms of JIS-C hardness. The cover may contain ionomer resin. The cover may have a hardness of at least 40 in terms of Shore D hardness. | 06-20-2013 |
20130154156 | GOLF BALL MOLD AND GOLF BALL MANUFACTURING METHOD - A golf ball mold body having a plurality of mold parts with a parting surface defining a parting line along an equator and removably mating to form a cavity having an inner wall with dimple-forming protrusions, and a support pin extendable into and retractable from the cavity, the support pin extending into the cavity to support a center sphere. An end face of the support pin defines a portion of the cavity inner wall when the support pin is retracted. The support pin has a shape satisfying certain conditions, and the support pin and mold body have a gap therebetween set within a specific range. The invention minimizes formation of uneven flash caused by deflection or shifting of support pins, appearance defects caused by damage to the cavity inner wall and contamination by rubbing debris, and the life of the mold is extended. | 06-20-2013 |
20130150185 | GOLF BALL COMPOSITION AND GOLF BALL - A golf ball having a good rebound and excellent flight performance can be obtained using a golf ball composition which contains a diene polymer having an aluminum catalyst residue content of not more than 650 ppm. | 06-13-2013 |
20130150184 | GOLF BALL COMPOSITION AND GOLF BALL - A golf ball having a good rebound and excellent flight performance can be obtained using a golf ball composition which contains a diene polymer having a smallest molecular weight value of at least 3,000. | 06-13-2013 |
20130150183 | GOLF BALL COMPOSITION AND GOLF BALL - A golf ball endowed with a good rebound and an excellent flight performance can be obtained using a golf ball composition of good workability which contains a diene polymer having a peak top molecular weight (Mp) on a molecular weight distribution curve measured using gel permeation chromatography (GPC) of at least 40×10 | 06-13-2013 |
20130150182 | GOLF BALL COMPOSITION AND GOLF BALL - A golf ball having a good rebound and excellent flight performance can be obtained using a golf ball composition which includes a diene polymer containing not more than 1.5% of components having a molecular weight of 30,000 or less. | 06-13-2013 |
20130150181 | GOLF BALL COMPOSITION AND GOLF BALL - A golf ball having a good rebound and excellent flight performance can be obtained using a golf ball composition which includes a diene polymer having a molecular weight distribution (Mw/Mn) of less than 1.9. | 06-13-2013 |
20130150177 | GOLF CLUB HEAD - An iron golf club head according to this invention includes a head body and a face member. The face member includes a front portion forming portion which forms the front portion of a sole portion. The head body includes a sole forming portion thicker than the front portion forming portion. The end surface of the sole forming portion on the side of a face portion includes a lower region attached to the end surface of the front portion forming portion on the back side, and an upper region above the lower region. An elastic body is disposed in the gap between the upper region and the back surface of the face member. | 06-13-2013 |
20130150176 | GOLF CLUB HEAD AND ORNAMENT - This invention provides a golf club head to which an ornament is fixed. The ornament includes a cup-shaped metal shell member, a solid elastic body which has a mounting surface fitted in the golf club head, and fills the interior of the shell member, and an adhesive layer which bonds the inner surface of the shell member to the elastic body. | 06-13-2013 |
20130143689 | GOLF CLUB SHAFT AND GOLF CLUB - According to an aspect of this invention, there is provided a golf club shaft including a prepreg containing a carbon fiber, wherein the prepreg is winded and cured, and a winding thickness of the prepreg on a striking face is larger than a winding thickness of the prepreg on any other portion. | 06-06-2013 |
20130143688 | GOLF CLUB SHAFT - A golf club shaft has the bending rigidity distribution and the torsional rigidity distribution satisfying the following three relational formulas: 1) S | 06-06-2013 |
20130137530 | GOLF CLUB SHAFT AND GOLF CLUB - A golf club is formed by winding and hardening a plurality of prepregs. High specific gravity materials having a higher specific gravity than carbon fiber are arranged on the butt side of the golf club. Arrangement of the high specific gravity materials is achieved by winding a high specific gravity material containing prepreg containing carbon fiber and a higher specific gravity material than the carbon fiber. Alternatively, the arrangement of the high specific gravity materials may be achieved by winding another high specific gravity material containing prepreg containing a glass fiber. | 05-30-2013 |
20130137529 | FERRULE AND GOLF CLUB - A ferrule includes: an upper body which projects from an upper end face of a hosel portion; an inserted portion which is provided to project downwards from the upper body to be inserted into an interior of a hosel hole; and a groove which is provided circumferentially on an outer circumferential surface of the inserted portion, wherein a lower end portion of the inserted portion has a diameter which is smaller than that of an upper side of the inserted portion than the groove. | 05-30-2013 |
20130131277 | RUBBER COMPOSITION FOR GOLF BALL - The invention provides a rubber composition for golf balls which includes (A) a base rubber containing a polybutadiene having a cis-1,4 bond content of at least 60 wt %, (B) an unsaturated carboxylic acid and/or a metal salt thereof, and (C) a diphenylamine of the general formula | 05-23-2013 |
20130131243 | RUBBER COMPOSITION FOR GOLF BALL - The invention provides a rubber composition for golf balls which includes (A) a base rubber containing a polybutadiene having a cis-1,4 bond content of at least 60 wt %, (B) an unsaturated carboxylic acid and/or a metal salt thereof, and (C) a thiourea of the general formula | 05-23-2013 |
20130131242 | RUBBER COMPOSITION FOR GOLF BALL - The invention provides a rubber composition for golf balls which includes (A) a base rubber containing a polybutadiene having a cis-1,4 bond content of at least 60 wt %, (B) an unsaturated carboxylic acid and/or a metal salt thereof, and (C) a thiourea of the general formula | 05-23-2013 |
20130131236 | RUBBER COMPOSITION FOR GOLF BALL - The invention provides a rubber composition for golf balls which includes (A) a base rubber containing a polybutadiene having a cis-1,4 bond content of at least 60 wt %, (B) an unsaturated carboxylic acid and/or a metal salt thereof, and (C) a benzimidazole of general formula (1) or (2) below | 05-23-2013 |
20130131234 | RUBBER COMPOSITION FOR GOLF BALL - The invention provides a rubber composition for golf balls which includes (A) a base rubber containing a polybutadiene having a cis-1,4 bond content of at least 60 wt %, (B) an unsaturated carboxylic acid and/or a metal salt thereof, and (C) a benzimidazole of general formula (1) below | 05-23-2013 |
20130130833 | GOLF CLUB HEAD - A golf club head according to this invention includes a face portion, a crown portion having a shape which bulges out upward, and a sole portion. The crown portion includes a vibration promotion region and a surrounding region which surrounds the vibration promotion region. The vibration promotion region has a circular or elliptical shape, and is flatter than the surrounding region. | 05-23-2013 |
20130123045 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball having a solid core, at least one intermediate layer and a cover. The core has a hardness which gradually increases from a core center to a core surface, with the golf ball having specific values for the hardness difference between the core center and the core surface; the hardness difference (I)−(II) in JIS-C hardness units being not more than ±2; the (hardness of intermediate layer material)−(hardness of core surface); the (initial velocity of sphere composed of core encased by intermediate layer)−(initial velocity of core); the (deflection of sphere composed of core encased by intermediate layer)/(deflection of core); and the (hardness of cover material)−(hardness of intermediate layer material). | 05-16-2013 |
20130123039 | GOLF CLUB - A golf club includes a shaft and a head, the torque of the entire length of the shaft being in a range of 3 to 5°. From viewpoints of a torsional rigidity distribution of the shaft, an integrated value of the torsional rigidity on the grip end side of the shaft is 85% or less of the integrated value of the torsional rigidity of the entire length of the shaft. The head has a distance to the center of gravity of 40 to 48 mm and a gravity center angle of 22 to 30°. | 05-16-2013 |
20130116066 | SOLID GOLF BALL - The invention provides a solid golf ball which has a core of at least one layer and a cover of at least one layer. At least one layer of the core is formed primarily of polybutadiene and includes at least 0.05 part by weight of a polyurethane resin powder having an average particle size of not more than 2 mm per 100 parts by weight of rubber component. At least one layer of the cover is formed primarily of polyurethane. | 05-09-2013 |
20130109505 | GOLF BALL MANUFACTURING METHOD AND GOLF BALL | 05-02-2013 |
20130109498 | GOLF CLUB HEAD AND METHOD OF MANUFACTURING THE SAME | 05-02-2013 |
20130109497 | GOLF CLUB HEAD | 05-02-2013 |
20130108783 | GOLF BALL MANUFACTURING METHOD | 05-02-2013 |
20130102415 | GOLF CLUB HEAD AND MANUFACTURING METHOD FOR THE SAME - A golf club head manufacturing method, including: welding a first reinforcing piece with first thickness to a central portion between a toe and a heel, so as to extend along an edge of a face side of a sole part, the sole part being part of a lower part formed integrally with a side part; welding a second reinforcing piece of second, larger thickness to a central portion between the toe and heel so as to extend along the edge on the face side of the first piece; welding a face part to the first and second pieces from an inner space of the lower part; welding a hosel part to the lower and face parts; welding a crown part to the lower, face and hosel parts; and welding the lower and face parts together from the outside. | 04-25-2013 |
20130095955 | SOLID GOLF BALL - The invention provides a solid golf ball having a core and a cover, the core being formed of a rubber composition containing a base rubber, a co-crosslinking agent, a crosslinking initiator and a metal oxide. The base rubber is a mixture of polybutadiene and a styrene-butadiene rubber, the styrene-butadiene rubber having a styrene bond content of not more than 35 wt %. The co-crosslinking agent is methacrylic acid. The core deflection under specific loading and the VR value for dimples on the ball surface are set within specific ranges. | 04-18-2013 |
20130079179 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball having a core, a cover of at least one layer encasing the core, and a layer of paint applied to a surface of an outermost layer of the cover, wherein the outermost cover layer or an inner cover layer adjacent to the outermost layer is formed of a resin composition which includes:
| 03-28-2013 |
20130066603 | GOLF BALL AND MECHANICAL ANALYSIS OF THE SAME - The accuracy or computation speed of mechanical analysis of a golf ball using the finite element method is increased. In the mechanical analysis, a model representing the golf ball is prepared on a computer, and computation is made by the finite element method using elements and nodes. At this time, the elements are made solid elements of hexahedron, the aspect ratio of the shape of each element is set so as to be not lower than 1.0 and not substantially higher than 6.5, and nodes are provided on the sides and at the vertexes of the hexahedron of element. | 03-14-2013 |
20130045819 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball having a solid core, an inner cover layer and an outer cover layer, which outer cover layer has a plurality of dimples on a surface thereof. In the golf ball, the hardness relationship between the inner cover layer and the outer cover layer, the ratio of deflection between the solid core and a sphere composed of the solid core encased by the inner cover layer, and the dimple conditions are all optimized. This multi-piece solid golf ball is able to substantially reduce the distance traveled by the ball when struck at a high head speed, while at the same time holding down the decrease in distance when struck at a low head speed. | 02-21-2013 |
20130029787 | MULTI-PIECE SOLID GOLF BALL - A multi-piece solid golf ball has a core, an envelope layer encasing the core, an intermediate layer encasing the envelope layer, and an outer layer which encases the intermediate layer and has formed on a surface thereof a plurality of dimples. The core is made of an elastomer. The envelope layer is formed of an inner envelope layer and an outer envelope layer, and the intermediate layer is formed of an inner intermediate layer and an outer intermediate layer. The outer layer has a hardness which is higher than the average core hardness, and each of the envelope layers and the intermediate layers is softer than the outer layer. | 01-31-2013 |
20130017903 | GOLF CLUB HEADAANM TAKECHI; TakaharuAACI Minato-KuAACO JPAAGP TAKECHI; Takaharu Minato-Ku JP - A golf club head of an iron type includes a face plate part for hitting a ball, which has a cavity part on the back side thereof; a sole part; a hosel part for connecting the head to a shaft; a viscoelastic body made to adhere to the back face of the face plate part, the viscoelastic body including a board-shaped part located on the back face of a central portion of the face plate part and extending parts extending from the board-shaped part to the toe side and the heel side of the head; and a cover plate lapping over the viscoelastic body, the cover plate including a concavity for accommodating the board-shaped part of the viscoelastic body and concave lines for accommodating the extending parts of the viscoelastic body. The cover plate has an opening, and a part of the viscoelastic body is exposed through the opening. | 01-17-2013 |
20130005500 | PUTTER HEAD - A putter head includes a head main body and a face insert which is mounted in a face surface of the head main body and formed of viscoelastic body, the face insert having a plurality of slits extending in a direction of toe to heel on a front surface thereof. The face insert is formed of a layered body in which first viscolastic bodies and second viscoelastic bodies having a lower hardness than the first viscoelastic bodies are placed on one another alternately in a direction intersecting the face surface. The slits are formed by eluting the face surface side of the second viscolastic body. The slits are inclined upward in a depth direction from the front face of the face insert to the rear side. | 01-03-2013 |
20120329578 | MOLD FOR FORMING GOLF BALL AND GOLF BALL MANUFACTURED USING THE SAME - There are provided a mold for forming a golf ball, which allows a dimple formed near the equator of golf ball corresponding to the partition surface of upper and lower molds to be formed so as to have the same shape as that of a dimple formed in other regions, and a golf ball manufactured using this mold. The mold for forming a golf ball in accordance with the present invention includes at least two body parts, a cavity is formed within the mold by the joining of the at least two body parts, and in at least one of the body parts, a groove for forming a projecting land part which is ground after the formation of the golf ball is provided in a cavity wall surface adjacent to the whole circumference of a parting line formed by the joining. | 12-27-2012 |
20120322584 | METHOD FOR ARRANGING DIMPLES ON GOLF BALL SURFACE - A method for arranging dimples on a golf ball surface includes: determining an initial arrangement of dimples; dividing the surface of a golf ball into multiple equivalent unit regions; based on a dimple interval between two freely selected dimples within one of the unit regions, determining whether or not the two dimples are in an adjacent relationship to each other; and changing the positions of the two dimples corresponding to the dimple interval between the two freely selected dimples in the adjacent relationship, wherein determining of the adjacent relationship and changing of the position are repeated until the maximum interval, which is a maximum value of the dimple interval between two freely selected dimples in the adjacent relationship in the unit region, falls below a predetermined value. | 12-20-2012 |
20120322580 | GOLF CLUB HEAD - A hollow golf club head according to this invention includes a face portion, a crown portion, and a sole/side portion which includes a sole portion and a side portion. This golf club head includes a rib which extends from the toe side to the heel side in the sole portion, and a weight portion which is provided in the sole portion on the back side with respect to the rib, and increases the amplitude of vibration of the sole portion. The natural frequency of the first-order vibration mode of the sole portion is 2,500 Hz or more. A mass m (g) of the weight portion satisfies 1≦m<6. The rib has a quadrangular cross-sectional shape with a width b (mm) and a height h (mm), and 0.20≦b·h | 12-20-2012 |
20120322578 | GOLF CLUB HEAD - This invention discloses a golf club head which has a hollow shell structure and includes a face portion, a sole portion, a crown portion, a back portion, a toe-side side portion, and a heel-side side portion. A ratio R/H×100% is 5% to 20%, where R is the radius of curvature of the upper corner edge on which the face portion and the crown portion intersect with each other, and H is the maximum head height. | 12-20-2012 |
20120322577 | GOLF CLUB HEAD - A golf club head having a hollow internal structure, of which a face portion includes, on its internal surface, an intersection portion located in the central portion of the face portion, a C-shaped outer peripheral portion having an opening on the side of a hosel portion, four main ribs extending from the intersection portion up to an outer edge of the face portion, and an intermediate portion located between the intermediate portion and the outer peripheral portion and the hosel portion. The intermediate portion is divided to four areas by the four main ribs. The thicknesses of a toe side area and a heel side area are greater than the thickness of the outer peripheral portion, and the thicknesses of a crown side area and a sole side area are less than the thickness of the outer peripheral portion. | 12-20-2012 |
20120316008 | MULTI-PIECE SOLID GOLF BALL - In a multi-piece solid golf ball having a core, an envelope layer, an intermediate layer and a cover, the hardness profile at the core interior and the hardness relationships among the various layers are optimized. The ball is endowed with an excellent flight performance on shots with a driver and an excellent controllability in the short game that are acceptable to professionals and other skilled golfers. The ball also has a good feel at impact and an excellent scuff resistance. | 12-13-2012 |
20120316006 | GOLF CLUB, METHOD FOR ADJUSTING CHARACTERISTICS THEREOF AND METHOD FOR PRODUCING GOLF CLUBHEAD - A golf club includes: a partition plate portion provided within a hosel column; a spline ring in which a spline is provided on an inner circumferential surface of an inner hole being interposed between a distal end portion of a shaft case and the partition plate portion; the spline ring welded to the shaft case; a projecting shaft portion provided at a distal end of the shaft case; a spline provided on an outer circumferential surface of the projecting shaft portion; wherein: the projecting shaft portion is inserted into the inner hole; the spline of the projecting shaft portion and the spline of the spline ring are in engagement with each other; and a bolt which is inserted through a bolt passage hole provided in the partition plate portion from a sole side of the clubhead is screwed into the shaft case. | 12-13-2012 |
20120302378 | GOLF BALL - The invention provides a golf ball having, on a surface thereof, a plurality of circular dimples, a plurality of non-circular dimples, and a land area which is a non-dimple region composed of a plurality of arcuate first lands, each formed along an edge of one of the circular dimples, and a plurality of second lands, each arranged so as to bridge between two neighboring circular dimples and having a shape that is recessed at a center portion thereof. The non-circular dimples have an edge shape defined by a plurality of the first lands in combination with a plurality of the second lands. In this golf ball, by fashioning the lands on the ball surface into a unique shape, the surface area of the lands is minimized and the dimple surface coverage is made even larger, increasing the aerodynamic performance and thus enabling the ball to travel even farther. | 11-29-2012 |
20120302373 | GOLF BALL - The invention provides a golf ball which includes a core and a cover encasing the core, wherein the cover has a thickness of at least 1.3 mm but not more than 1.8 mm and a material hardness, expressed as the Shore D hardness, of not more than 58, the core has a deflection when compressed under a final load of 1,275 N (130 kgf) from an initial load state of 98 N (10 kgf) of at least 4.1 mm, the ball has a deflection when compressed under a final load of 1,275 N (130 kgf) from an initial load state of 98 N (10 kgf) of at least 3.8 mm, and the ratio of the core deflection to the ball deflection (core/ball) is at least 0.8 but not more than 1.2. The ball of the invention can be sufficiently deformed on shots with a driver, even when played by a low head speed golfer, allowing a good ball rebound to be obtained and thus resulting in an increased distance. The ball also has a good feel when played and a satisfactory durability. | 11-29-2012 |
20120302371 | GOLF BALL - The invention provides a golf ball which includes a core and a cover encasing the core, wherein the cover has a thickness of at least 0.1 mm but less than 1.3 mm, the core has a deflection when compressed under a final load of 1,275 N (130 kgf) from an initial load state of 98 N (10 kgf) of at least 4.1 mm, the ball has a deflection when compressed under a final load of 1,275 N (130 kgf) from an initial load state of 98 N (10 kgf) of at least 3.8 mm, and the ratio of the core deflection to the ball deflection (core/ball) is at least 0.8 but not more than 1.2. The ball of the invention can be sufficiently deformed on shots with a driver, even when played by a low head speed golfer, allowing a good ball rebound to be obtained and thus resulting in an increased distance. The ball also has a good feel when played and an excellent controllability on approach shots. | 11-29-2012 |
20120302369 | GOLF CLUB HEAD - A hollow golf club head according to this invention includes a face portion, a crown portion, and a sole portion, and is formed by connecting a plurality of shell members to each other. This golf club head includes a rib which is provided in the sole portion and used to adjust an impact sound. The plurality of shell members are divided using at least the rib as a boundary. The plurality of shell members include a rib forming shell member including a sole portion forming portion which forms part of the sole portion, and a rib forming portion which stands upright from the end of the sole portion forming portion and forms the rib. | 11-29-2012 |
20120292803 | GOLF BALL - In a golf ball composed of a core and one or more cover layer which encloses the core, at least one cover layer is made primarily of a thermoplastic polyurethane elastomer obtained by reaction curing a polyurethane undiluted solution which includes both a copolymeric polycarbonate polyol-containing polyol component and a polyisocyanate component. The golf ball has an improved scuff resistance, particularly an improved low-temperature scuff resistance. | 11-22-2012 |
20120283044 | GOLF CLUB, HEAD OF GOLF CLUB AND METHOD FOR ADJUSTING PROPERTIES OF GOLF CLUB - A golf club head with a leading end of a shaft mountable thereon, the golf club head includes: a head main body, formed with a hosel insertion hole; a hosel, formed with a shaft case insertion hole and removably mounted in the hosel insertion hole; and a shaft case, formed with a shaft insertion hole and removably mounted in the shaft case insertion hole. | 11-08-2012 |
20120283041 | GOLF BALL - The invention provides a golf ball having a core formed by vulcanizing a rubber composition and a cover composed primarily of a polyurethane material. The rubber composition of the core includes 100 parts by weight of a base rubber, from 10 to 40 parts by weight of an unsaturated carboxylic acid or a metal salt thereof, a peroxyketal (a) and a monophenol-type antioxidant (b), the weight ratio (a)/(b) of the peroxyketal to the monophenol-type antioxidant being from 5 to 50. The ball has an excellent discoloration resistance and an outstanding distance and feel on shots taken with a middle iron. | 11-08-2012 |
20120277032 | GOLF BALL - A golf ball has a plurality of dimples, wherein: (1) the dimples have a peripheral edge with a radius of curvature R from 0.5 mm to 2.5 mm; (2) the surface coverage SR of the dimples, expressed as a percentage of the surface area of a hypothetical sphere representing the ball if it had no dimples, is from 60% to 74%; and (3) the ratio ER of a collective number of dimples RA having a radius of curvature R to diameter D ratio (R/D) of at least 20%, divided by a total number of dimples N on the surface of the ball, is from 15% to 95%. This combination of features enables damage to the paint film on the surface of the ball to be minimized, improves the durability of markings on the surface of the ball, and prevents a decline in ball performance. | 11-01-2012 |
20120277025 | PRACTICE GOLF BALL - A practice golf ball with a core and a cover has, upon initial measurement, a deflection BH1 (mm) when compressed under a final load of 1,275 N from an initial load of 98 N and an initial velocity BV1 (m/s), and also has, when measured again after being left to stand for 350 days following initial measurement, a deflection BH2 (mm) when compressed under a final load of 1,275 N from an initial load of 98 N and an initial velocity BV2 (m/s), such that the difference BH2−BH1 is not more than 0.2 mm and the difference BV2−BV1 is not more than 0.3 m/s. The ball has excellent durability to cracking and durability of appearance, and also maintains a stable feel and flight performance over a long period of time. | 11-01-2012 |
20120277024 | PRACTICE GOLF BALL - A practice golf ball has a core and a cover. The core is made of a rubber composition which includes a base rubber, a co-crosslinking agent which is methacrylic acid, a crosslinking initiator and a metal oxide. The respective ingredients in the rubber composition are formulated in specific amounts, and the core has an optimized hardness profile. The cover includes a resin component which is composed primarily of polyurethane. The cover has a thickness of 0.3 mm to 1.9 mm, and a material hardness, expressed as the Shore D hardness, of 30 to 48. The respective deflections of the core and the ball under a specific load, and the relationship therebetween, are optimized. The volume ratio VR of dimples on the surface of the ball is optimized. | 11-01-2012 |
20120277023 | PRACTICE GOLF BALL - In a practice golf ball having a core and a cover encasing the core, the cover has a material hardness, expressed as the Shore D hardness, of from 30 to 57. The core has an initial velocity CV (m/s) and the ball has an initial velocity BV | 11-01-2012 |
20120277022 | PRACTICE GOLF BALL - A practice golf ball has a core and a cover. The core is made of a rubber composition which includes a base rubber, a co-crosslinking agent which is methacrylic acid, a crosslinking initiator and a metal oxide. The respective ingredients in the rubber composition are formulated in specific amounts, and the core has an optimized hardness profile. The cover is made of a resin component which is composed primarily of polyurethane. The cover has a thickness of 0.3 mm to 1.9 mm, and a material hardness, expressed as the Shore D hardness, of 30 to 57. The respective deflections of the core and the ball under a specific load, and the relationship therebetween, are optimized. | 11-01-2012 |
20120277021 | PRACTICE GOLF BALL - A practice golf ball has a core made of a rubber composition which includes a base rubber, a co-crosslinking agent, a crosslinking initiator and a metal oxide, and has a cover which encases the core and is made of a resin material. The co-crosslinking agent is methacrylic acid. The resin material has a breaking strength of 20 to 80 MPa and an elongation of 150 to 600%. The ball is endowed with the properties required of practice balls intended for long-term use, including better durability to cracking and durability of appearance than ordinary game balls, and also better durability to ball surface loss than the one-piece golf balls which are commonly used as practice balls. | 11-01-2012 |
20120277020 | PRACTICE GOLF BALL - A practice golf ball has a core and a cover. The core is made of a rubber composition which includes a base rubber, a co-crosslinking agent, a crosslinking initiator and a metal oxide. The base rubber is a mixture of polybutadiene with styrene-butadiene rubber and/or isoprene rubber, and the co-crosslinking agent is methacrylic acid. The core has a specific deflection under a specific load, and the ball has a specific initial velocity. The dimples on the surface of the ball have a volume ratio VR of from 0.95 to 1.7. | 11-01-2012 |
20120270681 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball having a solid core encased by a cover of one, two or more layers, the solid core including a spherical first layer, a second layer encasing the first layer and a third layer encasing the second layer. The first layer has a diameter of from 3 to 24 mm, and the third layer is formed of a rubber composition composed primarily of polybutadiene rubber. The ball has specific relationships between the cross-sectional hardness at the core center on a cut face when the solid core has been cut in half and the respective hardnesses of the first layer 1 mm inside an interface between the first layer and the second layer, the second layer 1 mm outside the interface between the first layer and the second layer, the second layer 1 mm inside an interface between the second layer and the third layer, the third layer 1 mm outside the interface between the second layer and the third layer, and the surface of the third layer. Such a golf ball has a high initial velocity when hit with a driver (W#1), and excessive spin receptivity on shots with a short iron is suppressed. As a result, an excellent flight performance is achieved, both on shots with a driver and on shots with a short iron. In addition, a good feel on impact can also be obtained. | 10-25-2012 |
20120270680 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball having a solid core encased by a cover of one, two or more layers, the solid core including a spherical first layer, a second layer encasing the first layer and a third layer encasing the second layer. The first layer has a diameter of from 3 to 24 mm, and the third layer is formed of a rubber composition composed primarily of polybutadiene rubber. The ball has specific relationships between the cross-sectional hardness at the core center on a cut face when the solid core has been cut in half and the respective hardnesses of the first layer 1 mm inside an interface between the first layer and the second layer, the second layer 1 mm outside the interface between the first layer and the second layer, the second layer 1 mm inside an interface between the second layer and the third layer, the third layer 1 mm outside the interface between the second layer and the third layer, and the surface of the third layer. Such a golf ball has both a reduced spin rate and a good initial velocity on shots, particularly when struck in a high head-speed range, and thus is able to achieve an increased distance, in addition to which it is also capable of having a good feel on impact. | 10-25-2012 |
20120270679 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball having a solid core encased by a cover of one, two or more layers, the solid core including a spherical first layer, a second layer encasing the first layer and a third layer encasing the second layer. The first layer has a diameter of from 3 to 24 mm, and the third layer is formed of a rubber composition composed primarily of polybutadiene rubber. The ball has specific relationships between the cross-sectional hardness at the core center on a cut face when the solid core has been cut in half and the respective hardnesses of the first layer 1 mm inside an interface between the first layer and the second layer, the second layer 1 mm outside the interface between the first layer and the second layer, the second layer 1 mm inside an interface between the second layer and the third layer, the third layer 1 mm outside the interface between the second layer and the third layer, and the surface of the third layer. Such a golf ball has a reduced spin rate on shots with a driver (W#1) and thus is able to achieve an increased distance, in addition to which the ball is able to obtain a good feel on impact. | 10-25-2012 |
20120270678 | MULTI-PIECE SOLID GOLF BALL - The invention provides a multi-piece solid golf ball having a solid core encased by a cover of one, two or more layers, the solid core including a spherical first layer, a second layer encasing the first layer and a third layer encasing the second layer. The first layer has a diameter of from 3 to 24 mm, and the third layer is formed of a rubber composition composed primarily of polybutadiene rubber. The ball has specific relationships between the cross-sectional hardness at the core center on a cut face when the solid core has been cut in half and the respective hardnesses of the first layer 1 mm inside an interface between the first layer and the second layer, the second layer 1 mm outside the interface between the first layer and the second layer, the second layer 1 mm inside an interface between the second layer and the third layer, the third layer 1 mm outside the interface between the second layer and the third layer, and the surface of the third layer. Such a golf ball has an increased initial velocity, particularly when struck in a high head speed range, enabling an increased distance to be achieved, in addition to which the ball is able to obtain a good feel on impact. | 10-25-2012 |
20120238377 | GOLF BALL - The present invention provides a multi-piece solid golf ball having a core, an envelope layer, an intermediate layer, and a cover, in this order, and has formed on a surface thereof a plurality of dimples. The core has a hardness which gradually increases from a center to a surface thereof, the hardness difference in JIS-C hardness units between the core center and the core surface being at least 15 and, letting (I) be the average value for cross-sectional hardnesses at a position about 15 mm from the core center and at the core center and letting (II) be the cross-sectional hardness at a position about 7.5 mm from the core center, the hardness difference (I)−(II) in JIS-C units being not more than ±2. The envelope layer, intermediate layer and cover have hardnesses which satisfy the condition: cover hardness>intermediate layer hardness>envelope layer hardness. | 09-20-2012 |
20120222574 | METHOD FOR PRINTING ON SPHERICAL OBJECT AND PAD TO BE USED THEREFOR - A method and apparatus for printing is provided. The method includes preparing a hollow printing pad having a transfer surface, the printing pad being configured so that when the transfer surface is pushed, the gas in the hollow part is released to the outside of the printing pad; transferring ink or paint in recesses formed on the surface of a printing plate to the transfer surface of the printing pad by applying the ink or paint onto the surface of the printing plate and by pressing the transfer surface of the printing pad against the surface of the printing plate; and transferring the ink or paint to the object to be printed by pressing the transfer surface of the printing pad against the object to be printed until at least the hemispherical portion of the object to be printed is wrapped by the transfer surface of the printing pad. | 09-06-2012 |
20120214617 | GOLF CLUB AND METHOD FOR ADJUSTING PROPERTIES THEREOF - A golf club is provided which includes: a head having a hosel having a hosel hole; a shaft; a shaft case having a shaft insertion hole to which one end of the shaft is inserted and configured to be inserted to the hosel hole; and a ring-shaped screw member configured to be screwed into one end of the hosel to fix the shaft case in the hosel hole, and to be fitted with an outer face of an one end of the shaft case so as not to contact with the shaft directly, wherein an axis of the shaft insertion hole is nonparallel to an axis of the hosel hole, and an inner face of the hosel hole and an outer face of the shaft case includes a triangular or more polygonal cross-sectional face that is perpendicular to the axis of the hosel hole. | 08-23-2012 |
20120208653 | GOLF CLUB AND METHOD FOR ADJUSTING CHARACTERISTICS OF GOLF CLUB - A golf club includes: a shaft; a head mounted on a leading end of the shaft; and a substantially cylindrical shaft case fixed to the leading end of the shaft, wherein: the shaft case is inserted into the tubular portion of the hosel of the head; the tubular portion includes a partition plate section in the lower portion thereof; a spacer is interposed between the leading end of the shaft case and partition plate section; the shaft case is unrotatably engaged with the spacer; the spacer and partition plate section respectively include stopper portions for preventing the rotation of the spacer; and a bolt inserted through bolt insertion holes respectively formed in the partition plate section and spacer from the sole side of the head is screwed into the shaft case, whereby the shaft case is fixed to the head. | 08-16-2012 |
20120190474 | GOLF CLUB, SHAFT INSERTION DEPTH CHANGING METHOD AND SHAFT REPLACING METHOD - A golf club includes: a shaft; a head mounted on a leading end of the shaft; and a substantially cylindrical shaft case fixed to the leading end of the shaft, wherein: the shaft case is inserted into a hosel of the head; the shaft case is fixed to the head by a bolt inserted from a sole side of the head; and a spacer is interposed between an upper end of the hosel and a flange portion formed in an upper portion of the shaft case or is removed therefrom to change an insertion depth of the shaft case into the hosel. | 07-26-2012 |
20120190469 | MEASUREMENT APPARATUS AND MEASUREMENT METHOD - A measurement apparatus includes a first Doppler sensor which outputs a first transmission signal and receives a first Doppler signal, that is the first transmission signal returned after being reflected by an impacting object, a timing detection unit that detects an impact timing which is a moment when an impacted object is impacted by the impacting object, an impacting object speed computing unit that computes a speed of the impacting object based on the first Doppler signals obtained from the detected impact timing to a timing before a predetermined period, and an imaging unit that images the impacted object immediately after the impact so as to be used for computing a motion state of the impacted object, based on the computed speed of the impacting object. | 07-26-2012 |
20120184395 | MULTI-PIECE SOLID GOLF BALL - A multi-piece solid golf ball has a core, an intermediate layer encasing the core, and a cover layer which encases the intermediate layer and has a plurality of dimples on an outer surface thereof. The intermediate layer is formed primarily of a material which includes specific amounts of a fatty acid and/or fatty acid derivative having a molecular weight of from 228 to 1500 and a basic inorganic metal compound capable of neutralizing un-neutralized acid groups per 100 parts by weight of a resin component composed primarily of a specific olefin-unsaturated carboxylic acid copolymer, and in which at least 82 mol % of acid groups in the above components are neutralized. The cover layer is formed of a thermoplastic resin composed primarily of an ionomer resin, and has a Shore D hardness of from 50 to 85. This invention makes it possible to achieve both an increased distance owing to a reduced spin rate, and also an improved durability. | 07-19-2012 |
20120184392 | PUTTER HEAD - A putter head includes a head main body having a recess portion in a face surface of the putter head, and a face insert disposed in the recess portion. The face insert has a slit extending upward from a bottom face thereof In the bottom face, the slit may extend from the vicinity of a toe-side end thereof to the vicinity of a heel-side end thereof A bottom end of the slit may be located on a rear edge of the face insert. A ceiling face of the slit may be in a shape of an arch from the toe side to the heel side. The slit may be filled with a viscoelastic material. | 07-19-2012 |
20120184390 | IRON GOLF CLUB HEAD - An iron golf club head includes a hosel part embedded member installed in a hosel part thereof, a sole part embedded member installed in a sole part thereof, and a top part embedded member installed in an upper portion of a face part of thereof. In a shank part (neck part) connecting the hosel part to the body part, a connecting embedded member for connecting the hosel part embedded member to the sole part embedded member is installed. These embedded members are covered with a synthetic resin layer. The hosel part embedded member and the connecting embedded member each are preferably made of a metal. | 07-19-2012 |
20120166149 | SIMULATION METHOD FOR EVALUATING A GOLF CLUB HEAD - A simulation method for evaluating the aerodynamic performance of a golf club head uses arithmetic operations executed by a computer to analyze air flow around the head of a golf club when the club is swung, and thereby estimates the aerodynamic forces which act on the club head. Because the aerodynamic properties of a golf club head are evaluated without relying on experimental evaluations using physical prototypes, this method enables the efficient development of golf clubs. | 06-28-2012 |
20120165478 | RUBBER COMPOSITION FOR GOLF BALLS - The invention provides a rubber composition for golf balls which includes (A) a base rubber containing a polybutadiene having a cis-1,4 bond content of at least 60 wt %, (B) an unsaturated carboxylic acid and/or a metal salt thereof, and (C) two or more organic peroxides which include (C-1) an organic peroxide having a one-minute half-life temperature of 145 to 185° C. and (C-2) an organic peroxide having a one-minute half-life temperature of 110 to 135° C. | 06-28-2012 |
20120165475 | RUBBER COMPOSITION FOR GOLF BALLS - The invention provides a rubber composition for golf balls which includes (A) a base rubber containing a polybutadiene having a cis-1,4 bond content of at least 60 wt %, (B) an unsaturated carboxylic acid and/or a metal salt thereof, and (C) two or more organic peroxides which include (C-1) an organic peroxide having a solubility parameter (SP) of 9 or less and (C-2) an organic peroxide having a solubility parameter (SP) of 10 or more. The golf ball rubber composition of the invention enables a high-quality molded and crosslinked product having a suitable hardness and a high resilience to be obtained. | 06-28-2012 |
20120165470 | RUBBER COMPOSITION FOR GOLF BALLS - The invention provides a rubber composition for golf balls which includes (A) a base rubber containing a polybutadiene having a cis-1,4 bond content of at least 60 wt %, (B) an unsaturated carboxylic acid and/or a metal salt thereof, and (C) two or more organic peroxides which include (C-1) an organic peroxide other than a diacyl peroxide and (C-2) an organic peroxide which is a diacyl peroxide. | 06-28-2012 |
20120165143 | TENNIS BALL FELT AND TENNIS BALL - To provide a tennis ball felt which has less occurrence of creases at the time of forming a tennis ball. According to one embodiment, a tennis bass felt, which is covered on a core of a tennis ball, includes: a base fabric formed of stretchy material; and fibers fixed with the base fabric. | 06-28-2012 |
20120161363 | GOLF BALL MOLD AND GOLF BALL MANUFACTURING METHOD - The invention provides a golf ball mold that includes a mold body configured as a plurality of mold parts which have at least a parting surface that defines a parting line at a golf ball equator and removably mate to form a cavity having an inner wall with a plurality of dimple-forming protrusions thereon, and a support pin which has an end face with a plurality of dimple-forming protrusions thereon and is extendable into and retractable from the cavity. The support pin extends into the cavity to support a center sphere and, when in a retracted state, the end face thereof defines a portion of the inner wall of the cavity. The end face of the support pin includes a pole of the cavity and has a peripheral edge which intersects a parallel of latitude at 10 degrees from the pole. | 06-28-2012 |
20120157235 | MULTI-PIECE SOLID GOLF BALL - A multi-piece solid golf ball has a core, at least one intermediate layer encasing the core, and a cover of at least one layer encasing the intermediate layer. The core is formed of a base rubber, and the intermediate layer and cover are each formed of a resin material. The intermediate layer has a thickness (a) and the cover has a thickness (b) such that the ratio a/b is from 0.7 to 1.9, and the core has a diameter (c) such that the ratio c/a with the intermediate layer thickness (a) is from 23 to 38. The intermediate layer has a material hardness (Shore D) of from 42 to 76, and the cover has a material hardness (Shore D) of from 41 to 69. The ball satisfies the following relationship: cover material hardnesscore surface hardness, and wherein a Shore D hardness at the core surface minus a Shore D hardness at the core center is not more than 17 units. This golf ball has an improved flight performance and a good, solid feel on impact. | 06-21-2012 |
20120157234 | MULTI-PIECE SOLID GOLF BALL - A multi-piece solid golf ball has a core, at least one intermediate layer encasing the core, and a cover of at least one layer encasing the intermediate layer. The core is formed of a base rubber, and the intermediate layer and cover are each formed of a resin material. The intermediate layer has a thickness (a) and the cover has a thickness (b) such that the ratio a/b is from 0.7 to 1.9, and the core has a diameter (c) such that the ratio c/a with the intermediate layer thickness (a) is from 23 to 38. The intermediate layer has a material hardness (Shore D) of from 54 to 76, and the cover has a material hardness (Shore D) of from 47 to 69. The ball satisfies the following relationship: cover material hardnesscore surface hardness. This golf ball has an improved flight performance and a good, solid feel on impact. | 06-21-2012 |
20120157233 | MULTI-PIECE SOLID GOLF BALL - A multi-piece solid golf ball has a core, an envelope layer encasing the core, an intermediate layer encasing the envelope layer, and an outer layer which encases the envelope layer and has formed on a surface thereof a plurality of dimples. The core is made of an elastomer. The envelope layer is formed of an inner envelope layer and an outer envelope layer, and the intermediate layer is formed of an inner intermediate layer and an outer intermediate layer. Letting the average hardness of the core be expressed by the following formula: | 06-21-2012 |
20120157229 | GOLF CLUB HEAD AND METHOD OF MANUFACTURING THEREOF - A clubhead of a golf club which is a metallic hollow clubhead includes: a face portion; a crown portion; a hosel portion; and a lower part including a sole portion and side portions, wherein: the hosel portion and the crown portion are welded to the lower part; and the lower part is pressed out of a material plate and is thereafter subjected to a chemical polishing so that a thickness of the lower part varies by position. | 06-21-2012 |
20120157226 | PUTTER HEAD - This invention provides a putter head comprising a head body and a face insert mounted on a face surface of the head body. Slits are vertically aligned in multiple stages so as to extend in the face insert in a toe-to-heel direction. A depending portion is provided in the slit on a side of the face surface so as to reduce a vertical dimension of the slit. The slit is filled with a viscoelastic material. | 06-21-2012 |
20120157220 | GOLF CLUB SHAFT SELECTION DEVICE - A golf club shaft selection device includes: a plurality of synthetic resin or metallic tube members which are adapted to be wound individually around a plurality of areas of a golf club shaft which result when the golf club shaft is so divided along the length thereof, wherein one or two tube members in the plurality of tube members are fixed around the shaft so as to change a stiffness value and kick point of the shaft at the areas around which the tube members are wound. | 06-21-2012 |
20120149495 | GOLF CLUB HEAD - A golf club head is provided that includes a face part formed of a metallic material. The face part includes a thick-walled portion centrally located in the face part and configured as an elliptical or circular shape having depressions on two opposite sides thereof, and an outer peripheral portion located on the outer periphery thereof. The thick-walled portion includes a central portion having a first thickness which is greatest in the face part; a first ridge surrounding the central portion and having a second thickness less than the first thickness; and a first valley located between the central portion and the first ridge and having a third thickness less than the second thickness. The outer peripheral portion includes two first areas respectively adjacent to the two depressions of the thick-walled portion and having a fourth thickness less than the third thickness. | 06-14-2012 |
20120149494 | HOLLOW GOLF CLUB HEAD - This invention provides a hollow golf club head comprising a face portion, a crown portion, a sole portion, a side portion, and a hosel portion. A crown projecting portion in which the crown portion partly projects upward is formed at a position including a face center in the face-side region of the crown portion, and the thickness of the crown projecting portion gradually decreases toward the back. | 06-14-2012 |
20120142450 | GOLF CLUB HEAD - This invention provides a hollow golf club head including a face portion, a crown portion, and a sole/side portion including a sole portion and a side portion. This golf club head includes a rib which extends from the toe side to the heel side in the sole portion, and a weight portion which is provided in the sole portion on the side of the face portion with respect to the rib or the back side with respect to the rib, and increases the amplitude of vibration of the sole portion. | 06-07-2012 |
20120136464 | GOLF SWING CLASSIFICATION METHOD, SYSTEM, DEVICE, AND PROGRAM - An object of the present invention is to provide a golf club classification method capable of classifying a golf swing precisely. Specifically, the present invention provides a classification method comprising steps of: partitioning the golf swing of the golfer into golf swing trajectories of a back swing, a down swing, and a follow through so as to determine a stable point in the golf swing trajectories as an origin for any two of the trajectories and to assign a two dimensional coordinate to the two golf swing trajectories; determining straight lines connecting each of one point selected within each of the two golf swing trajectories and the origin; calculating angles between each of the determined straight lines and the horizontal line respectively for the two golf swing trajectories; and classifying the golf swing based on a difference between the calculated angles. | 05-31-2012 |
20120129629 | GOLF BALL - A golf ball includes, as a constituent element thereof, a molded and crosslinked product obtained from a rubber composition containing (A) a base rubber which includes a polybutadiene having a cis-1,4 bond content of at least 60 wt %, (B) an unsaturated carboxylic acid and/or a metal salt thereof, (C) an organosulfur compound, (D) one or more organic peroxide selected from the group consisting of peroxyketals and/or dialkyl peroxides, and (E) one or more organic peroxide selected from the group consisting of hydroperoxides. In the golf ball, the value obtained by subtracting a center hardness of the molded and crosslinked product from a surface hardness thereof, expressed as the JIS-C hardness, is at least 20. The golf ball has a reduced spin rate on shots with a driver and therefore is able to follow a reliable trajectory that does not tend to dip or to rise in a high arc, enabling an increased distance to be achieved. | 05-24-2012 |
20120129624 | GOLF CLUB GRIP - A golf club grip having a double construction includes a cylindrical inside layer part made of a first rubber having a first hardness, and a cylindrical outside layer part made of a second rubber having a second hardness lower than the first hardness, which part covers the cylindrical inside layer part. The cylindrical inside layer part has a length 1 to 4 cm longer than the length of a half of the entire length of the grip. The cylindrical inside layer part is provided with a plurality of longitudinal projecting strips formed on the outer peripheral surface thereof, and the plurality of longitudinal projecting strips extend from the proximal end side of the cylindrical inside layer part to a portion of 70 to 80% of the entire length of the cylindrical inside layer part along the axis line direction of the cylindrical inside layer part, and are formed at fixed intervals in the circumferential direction. The cylindrical outside layer part is provided with a plurality of circumferential grooves, which are formed at fixed intervals in the axis line direction, on the outer peripheral surface of a portion covering a portion of the cylindrical inside layer part in which the longitudinal projecting strips are formed. The cylindrical outside layer part is provided with a plurality of longitudinal grooves formed on the outer peripheral surface on the distal end side of the circumferential grooves. | 05-24-2012 |
20120122614 | COLORED GOLF BALL - In a colored golf ball having a core, a cover of two or more layers encasing the core, and a coat of paint applied to a surface of an outermost layer of the cover, the outermost cover layer is formed of a resin composition which includes (a) a thermoplastic resin, (b) a fluorescent color-containing color pigment and/or dye, and (c) titanium oxide. A layer adjoining an inner side of the outermost layer is formed of a resin composition containing a resin. The colored golf ball has an excellent rebound and weatherability, and also is endowed with a high brightness and a sense of quality and elegance. | 05-17-2012 |
20120122609 | GOLF BALL MATERIAL AND GOLF BALL - A golf ball material composed of a polymer material that contains spherical inorganic particulates, which is well adapted for use in at least one component of a golf ball composed of one or more layers. The golf ball material of the invention improves the flight performance of golf balls compared with polymer materials containing amorphous inorganic particulates. | 05-17-2012 |
20120108360 | MULTI-PIECE SOLID GOLF BALL - A multi-piece solid golf ball is composed of a solid core encased by a cover of one or more layer, which solid core has an inner core layer and an outer core layer. The inner core layer is formed primarily of a thermoplastic resin, and has a cross-sectional hardness difference of within ±5 between any two points on a cross-section obtained by cutting the inner core layer in half. The outer core layer is formed of a rubber composition made primarily of polybutadiene rubber. The solid core has a diameter of from 35 to 42 mm. The ball has specific relationships between the hardness of the inner core layer 1 mm inside a boundary between the inner core layer and the outer core layer, the hardness of the outer core layer 1 mm outside the boundary, and the surface hardness of the outer core layer. | 05-03-2012 |
20120100933 | MULTI-PIECE SOLID GOLF BALL - A multi-piece solid golf ball has a core, an envelope layer encasing the core, an intermediate layer encasing the envelope layer, and a cover which encases the intermediate layer and has formed on a surface thereof a plurality of dimples. The envelope layer is formed of an inner envelope layer, an intermediate envelope layer and an outer envelope layer. The inner, intermediate and outer envelope layers, the intermediate layer and the cover are each formed primarily of a resin material which may be of the same or different types, and the core is formed primarily of a rubber material. The cover has a material hardness which is the same as or lower than the core center hardness. One of the inner layers has a material hardness which is higher than either or both of the cover material hardness and the average core hardness (defined as the arithmetic mean of the core surface hardness and the core center hardness). The golf ball, even when used by those golfers among professionals and skilled amateurs who, on striking a ball with a driver, tend to generate shots having a rather low spin rate and a low launch angle, has an excellent flight performance and also excellent controllability in the short game that are acceptable to such users. In addition, it has a good feel on impact and an excellent scuff resistance. | 04-26-2012 |
20120100932 | MULTI-PIECE SOLID GOLF BALL - A multi-piece solid golf ball has a core, an envelope layer encasing the core, an intermediate layer encasing the envelope layer, and a cover which encases the intermediate layer and has formed on a surface thereof a plurality of dimples. The envelope layer is formed of an inner envelope layer, an intermediate envelope layer and an outer envelope layer. The inner, intermediate and outer envelope layers, the intermediate layer and the cover are each formed primarily of a resin material which may be of the same or different types, and the core is formed primarily of a rubber material. The cover has a material hardness which is higher than the core center hardness. One of the inner layers has a material hardness which is higher than either or both of the cover material hardness and the average core hardness (defined as the arithmetic mean of the core surface hardness and the core center hardness). The golf ball lowers the spin rate on full shots with a driver, increasing the distance traveled by the ball, and has a good controllability, maintaining a straight path particularly on full shots. In addition, it has a good feel on impact and an excellent scuff resistance. | 04-26-2012 |
20120095148 | GOLF BALL MATERIAL, GOLF BALL AND METHOD FOR PREPARING GOLF BALL MATERIAL - A golf ball material composed of (A) an oxygen-containing inorganic metal compound in the form of a particulate or a master batch capable of neutralizing at least some of the acid groups in an acid-containing polymer blend, (B) one or more polymer selected from among diene polymers, thermoplastic polymers and thermoset polymers, and (C) an acid-containing polymer is prepared by mixing component A in a blend of components B and C. The golf ball material has a good heat resistance, flowability and processability, and can be used to produce high-performance golf balls having durability, scuff resistance and optimal hardness without a loss of rebound. | 04-19-2012 |
20120088599 | PUTTER HEAD - This invention provides a putter head comprising a head body and a face insert mounted on a face surface of the head body. A notched portion is provided in a rear surface of the face insert to extend upward from a lower end portion. | 04-12-2012 |
20120083574 | GOLF BALL MATERIAL, GOLF BALL AND METHOD FOR PREPARING GOLF BALL MATERIAL - The invention provides a golf ball material composed of an ionomeric resin composition obtained by melt-blending under applied heat one or more compounds selected from among UV/EB-curable materials with, in the presence of a peroxide, a non-ionomeric thermoplastic resin and an ionomeric resin; or of an ionomeric resin composition obtained by using, instead of the ionomeric resin, an acid-containing polymer base of the ionomeric resin and subjecting the acid-containing polymer composition similarly prepared by melt-blending under applied heat to an acid-neutralizing reaction with a metal ionic species. Methods for preparing such a material, and golf balls which include as a component therein a molding made of the golf ball material are also provided. The golf ball material has a good thermal stability, flow and processability, and can thus be used to obtain high-performance golf balls endowed with an excellent abrasion resistance, scuff resistance, durability and flexibility without a loss of rebound. | 04-05-2012 |
20120083357 | GOLF CLUB SHAFT AND GOLF CLUB THEREWITH - A golf club shaft has a length of a shaft of 1050 mm to 1170 mm and a sum of flexural rigidities at positions 150 mm, 200 mm and 250 mm from a front end of the shaft of A | 04-05-2012 |
20120077624 | GOLF BALL AND METHOD OF IMPROVING GOLF BALL PERFORMANCE - A golf ball having a polymer layer that has been subjected to impregnation treatment with an isocyanate and/or isothiocyanate-containing olefin compound exhibits at least one improved golf ball attribute, such as scuff resistance or spin performance, compared with an original golf ball that has not been treated by impregnation. | 03-29-2012 |
20120072184 | GOLF BALL AND METHOD FOR DESIGNING SAME - A golf ball includes noncircular dimples having smooth bottom surfaces; a method for designing the golf ball is disclosed. A noncircular dimple D | 03-22-2012 |
20120071272 | GOLF BALL - The invention provides a golf ball in which an intermediate layer formed of a highly neutralized resin mixture obtained by using two nonionic resins of differing weight-average molecular weights and breadths of molecular weight distribution (weight-average molecular weight/number-average molecular weight) as the base resin and adding thereto an organic acid or a metal salt thereof and a basic inorganic metal compound capable of being neutralized is combined with a cover formed of an ionic resin having a weight-average molecular weight in a specific range and a breadth of molecular weight distribution (weight-average molecular weight/number-average molecular weight) in a specific range. The golf ball material of the invention has an excellent rebound and durability. | 03-22-2012 |
20120065949 | GOLF BALL ESTIMATE SIMULATION METHOD - When an air stream is made to flow into a virtual airflow space set up by computer and the velocity, direction and pressure of the air stream flowing around a rotating golf ball model are calculated for each cell of a grid, by setting an airflow stabilization time during which computation proceeds without rotation of the golf ball model until the air stream that flows into the virtual airflow space ceases to be influenced by the initial air stream and stabilizes, then rotating the golf ball model at a given spin rate once the airflow stabilization time has elapsed and calculating the velocity, direction and pressure of the air stream for each grid cell, the computational time can be greatly shortened without lowering accuracy, enabling coefficients of lift and coefficients of drag to be easily calculated from the velocity, direction and pressure of the air stream for each grid cell. | 03-15-2012 |
20120064997 | CLUBHEAD OF IRON GOLF CLUB - A clubhead of an iron golf club includes: a head main body including a face portion and a hosel portion; a back member including a sole surface and a back surface; and a fixing member configured to detachably fix the back member to the head main body. | 03-15-2012 |
20120064994 | GOLF CLUB HEAD - A face member of a golf club head includes first and second main ribs disposed inside thereof. The first main rib is extended from a crown side to a sole side and the second main rib is extended from a hosel side to a toe side of the sole. The first and the second main ribs intersect with each other at an intersection portion. Additionally, a first groove is provided from the intersection portion of the rib toward the sole side, and a second groove is provided from the intersection portion of the rib toward the toe side. | 03-15-2012 |
20120046129 | GOLF BALL - The invention provides a golf ball having a core, a cover of at least one layer formed over the core, and a plurality of dimples on a surface of an outer layer of the cover. The ball has a coat of paint at the dimples, and non-dimple areas of the ball surface lack a coat of paint, leaving the outer cover layer exposed. The outer cover layer is formed of a material having a material hardness (Shore D) of less than 60. The dimples have a surface coverage (SR) of from 70 to 85%. | 02-23-2012 |
20120035002 | COLORED GOLF BALL - In a colored golf ball having a core, a cover of at least one layer encasing the core and a coat of paint applied to a surface of an outermost layer of the cover, the outermost cover layer is formed of a resin composition which includes (a) a thermoplastic resin, (b) a color pigment or dye, (c) titanium oxide, and (d) a lubricant. The resin composition has a total light transmittance of at least 1.0 but not more than 40, and a diffuse transmittance of at least 1.0 but not more than 40. The paint coat contains a polarizing pigment. The ball has an excellent visibility and stylishness and, in spite of being pastel-colored, is endowed with an appearance that is lustrous and elegant. | 02-09-2012 |