Class / Patent application number | Description | Number of patent applications / Date published |
473289000 | Particular correlated shaft flexural characteristic | 17 |
20080234065 | GOLF CLUB - This invention provides a wood type golf club including a shaft, a grip at one end of the shaft, and a head at the other end of the shaft, wherein a mass m (g) of the golf club and a length L (cm) from a grip side end of the golf club to a barycentric position of the golf club satisfy m×L=2.55×104 (g·cm) and m×L | 09-25-2008 |
20080242438 | Golf shaft, golf club, and production method for golf shaft - A golf shaft includes: a hollow tubular structure; and a gradient structure in which an amount of retained austenite is increased from an approximate center in a thickness direction of the hollow tubular structure to a surface of the hollow tubular structure. | 10-02-2008 |
20080305882 | Golf Club Head and Method of Manufacturing - A system and method relate to methods for matching a set of golf club shafts for a set of golf clubs. Other embodiments are disclosed herein. | 12-11-2008 |
20090005189 | Golf club shaft tuner - A moveable shaft insert assembly about 13 to 18 inches long weighing less than 50 grams is inserted into a hollow golf dub shaft wherein the depth of insertion of the shaft insert assembly may vary from about 1 to 10 inches. Changing the location of the shaft insert assembly allows a player to change the flex of the shaft and thereby optimize the performance of the club dynamics for that player for that day. The shaft insert is held in place by friction between the shaft and the shaft insert assembly. So shaft flex fitting can be administered by a player with or without coaching, and can be revisited at any time by a simple adjustment The shaft inserts are useful on all hollow shaft clubs, and can be retrofitted to existing clubs without removing the grip. | 01-01-2009 |
20090069109 | Golf club shaft | 03-12-2009 |
20090131193 | METHODS, APPARATUS, AND SYSTEMS TO CUSTOM FIT GOLF CLUBS - Embodiments of methods, apparatus, and systems to custom fit golf clubs are generally described herein. Other embodiments may be described and claimed. | 05-21-2009 |
20090239677 | GOLF-CLUB SHAFTS HAVING SELECTABLE-STIFFNESS TIP REGIONS, AND GOLF CLUBS COMPRISING SAME - The subject golf clubs have a shaft and clubhead. The shaft has a tip-end coupled to the clubhead, a butt-end, a reduced-EI portion located adjacent the tip-end, and a remaining portion extending between the butt-end and the reduced-EI portion. The portions are coupled together at an interface. The remaining portion exhibits a respective rate of stiffness reduction as a function of distance from the butt-end. The reduced-EI portion is typically shorter than and has less stiffness than the remaining portion. A stiffener is coupled to the shaft, such as in the reduced-EI portion, to add stiffness locally. The reduced-EI portion exhibits a respective rate (which can be zero) of stiffness reduction as a function of distance toward the tip-end. These rates can be similar or different. The interface can exhibit a greater rate in stiffness reduction than the other portions. The stiffeners can be user-selectable, from a kit supplied with the club, for example. The clubhead can be removable from the shaft to facilitate stiffener exchange. | 09-24-2009 |
20100041492 | GOLF CLUB SHAFT WITH HIGH BALANCE POINT AND GOLF CLUB INCLUDING SAME - A golf club shaft having a weight distribution such that the balance point percentage is less than or equal to 44.50%. The weight distribution of the shaft allows for an increase in length and/or club head weight of a golf club while having a reduced impact on the swing weight. | 02-18-2010 |
20100160065 | Swingweight Adjusted Golf Club Shaft - An improved golf club shaft and corresponding golf club is disclosed. More specifically, a golf club shaft that is capable of minimizing or eliminating swingweight variations within a golf club despite being cut down to various different lengths to accommodate the length and heads of a set of irons is disclosed. The shaft may have an internal wall profile of variable thickness to adjust for various weight and center of gravity variations of a golf club shaft as it is being cut down in length. | 06-24-2010 |
20100167833 | SHAFT SET FOR GOLF CLUBS AND CLUB SET INCLUDING THE SAME - A shaft set includes plural shafts used for wood-type golf clubs each having a length of 40 inches to 48 inches. Among the plural shafts, a shaft used for a longer club has a smaller amount of change Δ1 in bending stiffness in a section from 600 mm to 800 mm from a tip of the shaft. Among the clubs using the plural shafts, the amount of change Δ1 in bending stiffness decreases at a constant rate in a range of 0.7×10 | 07-01-2010 |
20110070968 | DEVICE FOR STIFFENING A GOLF CLUB SHAFT - A device for stiffening a golf club shaft which includes a strip of material configured to engage the exterior of the golf club shaft. The longitudinal axis of the strip may be configured to extend in a direction parallel to a longitudinal axis of the golf club shaft when the strip engages the golf club shaft. The strip may be configured to increase the stiffness of a portion of the golf club shaft when the strip engages the portion of the golf club shaft. The strip may include longitudinal fibers configured to extend in a direction parallel to a longitudinal axis of the golf club shaft when the strip is engaged to the exterior of the golf club shaft. An associated method for fitting a golf club with a shaft stiffening device is also described. | 03-24-2011 |
20110077097 | GOLF-CLUB SHAFTS HAVING SELECTABLE-STIFFNESS TIP REGIONS, AND GOLF CLUBS COMPRISING SAME - The subject golf clubs have a shaft and clubhead. The shaft has a tip-end coupled to the clubhead, a butt-end, a reduced-EI portion located adjacent the tip-end, and a remaining portion extending between the butt-end and the reduced-EI portion. The portions are coupled together at an interface. The remaining portion exhibits a respective rate of stiffness reduction as a function of distance from the butt-end. The reduced-EI portion is typically shorter than and has less stiffness than the remaining portion. A stiffener insert is inserted into the shaft, such as in the reduced-EI portion, to add stiffness locally. The reduced-EI portion exhibits a respective rate (which can be zero) of stiffness reduction as a function of distance toward the tip-end. These rates can be similar or different. The interface can exhibit a greater rate in stiffness reduction than the other portions. The stiffeners can be user-selectable, from a kit supplied with the club, for example. The clubhead can be removable from the shaft to facilitate stiffener exchange. | 03-31-2011 |
20110151988 | PERFORMANCE ENHANCED GOLF CLUB SHAFTS - A plurality of two or more golf club shafts designed to optimize the performance of a specific shaft with respect to a specific golf swing is disclosed herein. More specifically, the present invention discloses a plurality of two or more golf club shafts wherein a dramatic difference in torque can be achieved by two golf club shafts within the same weight classification regardless of the flex of the shaft. A plurality of golf club shafts in accordance with the present invention may generally a difference in weight-to-torque ratio of greater than about 1.5 and a difference in butt-frequency-to-torque ratio of greater than about 8.0 between any two golf club shafts within the plurality of golf club shafts. | 06-23-2011 |
20110256948 | MULTIPLE FLEX SHAFT METHOD AND SYSTEM FOR GOLF CLUBS - Embodiments of multiple flex shaft systems are disclosed herein. Other examples and related methods are also presented herein. | 10-20-2011 |
20110312435 | GOLF-CLUB SHAFTS HAVING SELECTABLE-STIFFNESS TIP REGIONS, AND GOLF CLUBS COMPRISING SAME - The subject golf clubs have a shaft and clubhead. The shaft has a tip-end coupled to the clubhead, a butt-end, a reduced-EI portion located adjacent the tip-end, and a remaining portion extending between the butt-end and the reduced-EI portion. The portions are coupled together at an interface. The remaining portion exhibits a respective rate of stiffness reduction as a function of distance from the butt-end. The reduced-EI portion is typically shorter than and has less stiffness than the remaining portion. The reduced-EI portion exhibits a respective rate (which can be zero) of stiffness reduction as a function of distance toward the tip-end. These rates can be similar or different. The interface can exhibit a greater rate in stiffness reduction than the other portions. | 12-22-2011 |
20120322572 | Multiple Flex Shaft Method and System for Golf Clubs - Embodiments of multiple flex shaft systems are disclosed herein. Other examples and related methods are also presented herein. | 12-20-2012 |
20130296065 | GOLF-CLUB SHAFTS HAVING SELECTABLE-STIFFNESS TIP REGIONS, AND GOLF CLUBS COMPRISING SAME - The subject golf clubs have a shaft and clubhead. The shaft has a tip-end coupled to the clubhead, a butt-end, a reduced-EI portion located adjacent the tip-end, and a remaining portion extending between the butt-end and the reduced-EI portion. The portions are coupled together at an interface. The remaining portion exhibits a respective rate of stiffness reduction as a function of distance from the butt-end. The reduced-EI portion is typically shorter than and has less stiffness than the remaining portion. The reduced-EI portion exhibits a respective rate (which can be zero) of stiffness reduction as a function of distance toward the tip-end. These rates can be similar or different. The interface can exhibit a greater rate in stiffness reduction than the other portions. | 11-07-2013 |