Patent ID: 7585231
Filing Date: 2009-09-08
Classification: A63B

Abstract:
1. A golf club shaft, comprising a torsional rigidity holding layer made of thermosetting resin including reinforcing fibers diagonally crossed in the longitudinal direction of said shaft and a UD flexural rigidity holding layer made of thermosetting resin including reinforcing fibers aligned in parallel in the longitudinal direction of said shaft, characterized in that said torsional rigidity holding layer includes a UD torsional rigidity layer and a plain weave fabric layer formed by winding like a shaft-shape a plain weave prepreg obtained by impregnating a plain weave fabric having mutually-woven warps and wefts with thermosetting resin and curing the prepreg in such a way that said warps and wefts are diagonally crossed in the longitudinal direction of said shaft, and a triaxial fabric layer formed by winding like a shaft-shape a triaxial fabric prepreg obtained by impregnating a triaxial fabric which has first warps inclined to wefts and second warps diagonally crossing with the first warps and has a structure where these warps and wefts are woven by alternately passing through upsides and downsides of yarns with thermosetting resin in such a way that said wefts become parallel with or vertical to the longitudinal direction of said shaft and curing the prepreg, and characterized in that said UD torsional rigidity holding layer, plain weave fabric layer, triaxial fabric layer, and UD flexural rigidity holding layer are laminated in this order.