Golf club

Abstract

The golf club includes a shaft, a golf club head equipped with a face portion and a hosel portion having an attachment hole for insertion of the shaft, and a support member attached to an opening portion of the attachment hole and formed into a cylindrical shape covering the outer circumferential surface of the shaft. The shaft includes a hollow shaft body and a sheet-like reinforcing layer constituted by low-elasticity fibers and arranged in the shaft body, the reinforcing layer being arranged at a position corresponding to at least the support member. The attachment hole includes a support portion having an inner diameter for supporting the outer circumferential surface of the shaft, and an engaging portion continuous with the support portion, having a larger inner diameter than the support portion, and open to the outside in an opening of the attachment hole.

1 . A golf club comprising:
 a shaft;   a golf club head equipped with a face portion and a hosel portion having an attachment hole for insertion of the shaft; and   a support member attached to an opening portion of the attachment hole and formed into a cylindrical shape covering an outer circumferential surface of the shaft,   wherein the shaft includes a hollow shaft body formed by stacking a plurality of sheet-like layers, and a sheet-like reinforcing layer constituted by low-elasticity fibers and arranged radially inward of a thickness center of the shaft body, the reinforcing layer being arranged at a position corresponding to at least the support member,   the attachment hole includes a support portion having an inner diameter for supporting the outer circumferential surface of the shaft, and an engaging portion continuous with the support portion, having a larger inner diameter than the support portion, and open to the outside in an opening of the attachment hole, and   the support member includes a ring-shaped inner portion configured to be fitted into the engaging portion of the attachment hole, and a ring-shaped outer portion configured to be coupled to the inner portion and come into contact with a peripheral edge of the opening of the attachment hole.   
     
     
         2 . The golf club according to  claim 1 , wherein the reinforcing layer is formed using carbon fibers or glass fibers, and has a tensile modulus of 20 ton/mm 2  or less. 
     
     
         3 . The golf club according to  claim 1 , wherein the reinforcing layer is arranged at an inner circumferential surface of the shaft body. 
     
     
         4 . The golf club according to  claim 1 ,
 wherein the hosel portion is formed using a metal material, and   the support member is formed using a resin material.   
     
     
         5 . The golf club according to  claim 1 ,
 wherein the engaging portion of the attachment hole is formed into a tapered shape whose inner diameter increases as the engaging portion extends to an opening side of the attachment hole, and   the inner portion of the support member is formed into a tapered shape whose outer diameter decreases as the inner portion extends away from the outer portion in an axial direction, so as to correspond to the engaging portion.