K. K. ENDO SEISAKUSHO Patent applications |
Patent application number | Title | Published |
20140094324 | GOLF CLUB - Three cylindrical concaves (reduced thickness portions) are formed in the intermediate portion between the centering so as to be spaced apart each other in the direction of the axis of the shaft inserting hole. The cylindrical concaves are formed to have an inner diameter of 11.3 mm that is larger than the inner diameter at the centering portions by removing the thickness of the hosel portion from its inner diameter of the centering portions towards outer side. The summed lengths of the bottom surfaces (peripheral surfaces) of the cylindrical concaves in the direction of the axis of the shaft inserting hole is 12 mm, thus reducing weight of the hosel portion by 3.03 g compared with conventional hosel portions. The reduced weight can be reallocated, to the sole portion. The gold thus produced in less expensive and has a reduced weight of the hosel. | 04-03-2014 |
20130143690 | GOLF CLUB HEAD AND METHOD FOR MANUFACTURING THE SAME - The present invention provides a golf club improved in ball hitting sound and ball hitting feeling and its manufacturing method. First, low-carbon steel is subjected to press processing of hot forging to form portions of irregularity on the face on a side of a hitting surface. Then, when there are projecting portions in the portions of irregularity, only the projecting portions are subjected to press processing of cold forging to crush the projecting portions to be flat. Then, the surface is slightly smoothed by machining to be flat and crystal grains at the portions of irregularity and the area therearound are pressed to be fined, thereby enhancing the hardness and forming fiber flows parallel to the hitting surface. A part of the hardened face becomes harder than the hardness of a base material before press processing by 10% or more within a range of 1 mm in a depth. | 06-06-2013 |
20130102412 | GOLF CLUB HEAD - A golf club having an increased moment of inertia and improved ball-hitting directionality is provided. A metal hollow golf club head comprises: a face portion; a crown portion; and a sole portion, and when the golf club has a lie angle of 60° with its club head volume being within 470 cm | 04-25-2013 |
20120214612 | IRON GOLF CLUB AND METHOD FOR MANUFACTURING THE SAME - An iron golf club is one made of metal material, which is manufactured integrally through press working and gives dedication to improvement of golf club design. The head ( | 08-23-2012 |
20110201448 | IRON GOLF CLUB AND METHOD FOR MANUFACTURING THE SAME - In order to sharpen and harden a corner portion of a score line edge portion of an iron golf club having a plurality of score lines on a face surface within a prescribed range, heat input is implemented on an edge portion of a groove through laser irradiation after the groove is machined and, as a result, the edge portion is hardened and melted to form a rounded corner R. The hardness is set at a Vickers hardness value (HV) of at least 350. The corner R forms a part of a contour line of the edge portion and this contour line is formed to exist between a first circle that contacts the face surface and a side surface of the groove and has a radius of 0.010 inches (0.254 millimeters) and a second circle that is concentric with the first circle and has a radius of 0.011 inches (0.2794 millimeters). | 08-18-2011 |
20100226698 | TUBE AND METHOD FOR MANUFACTURING THE SAME - A tube having enhanced durability and a method for manufacturing the same are provided, in which the tube has fine irregularities formed on the outer peripheral face or inner peripheral face at a substantially constant interval by way of a simple process. | 09-09-2010 |
20090176596 | WEDGE TYPE GOLF CLUB INCLUDING PITCHING WEDGE, APPROACH WEDGE AND SAND WEDGE - There is provided a golf club capable of giving a strong backspin to a golf ball. A shaft is connected to a head formed with score lines on a face surface thereof. A height from a sole face of the head or a horizontal plane flush with the sole face is formed greater than a radius of a golf ball. An upper protrusion and a lower protrusion are provided spacedly rearwardly of upper and lower portions of the head, respectively. By providing the center of gravity of the head in an upper portion than the center of the golf ball, backspin can be accelerated by a gear effect generated at the time of hitting the golf ball. Further, the height of up to the center of gravity of the head is freely adjustable. | 07-09-2009 |
20090023513 | IRON GOLF CLUB - An iron golf club for enhancing the gear effect and accelerating backspin of a ball. The head, which comprises a face part having a ball-hitting surface, a sole part having a ground-contact plane in the bottom portion of the head, a top part, and a hosel part, is configured such that the rigidity on the ground-contact plane side of the bottom portion is lowered by either providing the portion with a cavity or changing its material. Further, the vertical moment of inertia of the head is reduced by disposing a weight in the location of the center of gravity of the head. When the length of the hosel part is 50 mm or longer, the value of the moment of inertia becomes less than 800 g·cm | 01-22-2009 |