Golf club shaft and golf club

Abstract

A golf club shaft has a function of attenuating the vibration of the shaft at the time of impact and also having a function of stabilizing the struck ball. A shaft has an inner bias layer having a fiber direction that was inclined with respect the shaft axial direction and an outer bias layer having a fiber direction that is inclined with respect to the shaft axial direction in a direction opposite from that of the inner bias layer laminated as a fiber-reinforced resin layer, and a vibration-damping material sheet layer having a vertical-direction length of about 110 mm to about 150 mm disposed between the inner bias layer and the outer bias layer, with region of the position of the end of the grip attachment location as the rear end in the vertical direction.

1 . A golf club shaft comprising:
 resin layers, the resin layers comprising:
 an inner bias fiber-reinforced resin layer with reinforcing fibers aligned along the first direction that is inclined with respect to the shaft axial direction; 
 an outer bias fiber-reinforced resin layer the second direction that is inclined with respect to the shaft axial direction opposite to the first direction; and 
 a vibration-damping material sheet layer having a vertical-direction length of about 110 mm to about 150 mm, being interposed between the inner bias layer and the outer bias layer and being positioned at a range from about 55% to about 80% of the shaft length from a shaft tip. 
   
     
     
         2 . A golf club shaft according to  claim 1 , wherein the vibration damping material sheet layer is a polyester-based resin composition made of a polyester-based resin into which at least one of an electrically conductive material and a filler has been dispersed. 
     
     
         3 . A golf club shaft according to  claim 1 , wherein the layer made of the inner bias layer, the outer bias layer, and the vibration-damping material sheet layer is formed by laminating the inner bias layer prepreg sheet and the outer bias layer prepreg sheet with the vibration-damping material sheet interposed therebetween, and winding the laminate of the inner bias layer prepreg sheet and the outer bias layer prepreg sheet around a metal core. 
     
     
         4 . A golf club shaft according to  claim 3 , wherein the vibration-damping material sheet is disposed at a position of the beginning part of the winding of the inner bias layer prepreg sheet and the outer bias layer prepreg sheet around the metal core. 
     
     
         5 . A golf club shaft according to  claim 3 , wherein the vibration-damping material sheet is wound one turn around the metal core, and the laminate of the inner bias layer prepreg sheet and the outer bias layer prepreg sheet is wound four to six turns around the metal core. 
     
     
         6 . A golf club using a golf club shaft comprising a plurality of resin layers as the plurality of resin layers comprising an inner bias fiber-reinforced resin layer with reinforcing fibers aligned along the first direction that is inclined with respect to the shaft axial direction;
 an outer bias fiber-reinforced resin layer the second direction is that inclined with respect to the shaft axial direction opposite to the first direction; and   a vibration-damping material sheet layer having a vertical length of about 110 mm to about 150 mm, being interposed between the inner bias layer and the outer bias layer, and being positioned from about 235 mm to about 270 mm from a butt end of the shaft taken as the rear end in the vertical direction.   
     
     
         7 . A golf club using a golf club shaft comprising:
 resin layers, the resin layers comprising:
 an inner bias fiber-reinforced resin layer with reinforcing fibers aligned along the first direction that is inclined with respect to the shaft axial direction; 
 an outer bias fiber-reinforced resin layer with reinforcing fibers aligned along the second direction that is inclined with respect to the shaft axial direction opposite to the first direction; and 
 a vibration-damping material sheet layer having a vertical length of about 110 mm to about 150 mm, being interposed between the inner bias layer and the outer bias layer, and being positioned at a region of a position of the end of the grip attachment location is taken as the rear end in the vertical direction. 
   
     
     
         8 . A golf club according to  claim 6 , wherein the vibration-damping material sheet layer is a polyester-based resin composition made of a polyester-based resin into which at least one of an electrically conductive material and a filler has been dispersed. 
     
     
         9 . A golf club according to  claim 6 , wherein the layer made of the inner bias layer, the outer bias layer, and the vibration-damping material layer is formed by laminating the inner bias layer prepreg sheet and the outer bias layer prepreg sheet with the vibration-damping material layer sheet interposed therebetween, and winding the laminate of the inner bias layer prepreg sheet and the outer bias layer prepreg sheet around a metal core. 
     
     
         10 . A golf club according to  claim 9 , wherein the vibration-damping material sheet is disposed at a position of the beginning part of the winding of the inner bias layer prepreg sheet and the outer bias layer prepreg sheet around the metal core. 
     
     
         11 . A golf club according to  claim 9 , wherein the vibration-damping material sheet is wound one turn around the metal core, and the laminate of the inner bias layer prepreg sheet and the outer bias layer prepreg sheet is wound four to six turns around the metal core.