Golf club shaft and method of producing the same
An object is to achieve a golf club shaft and a method of producing the same, wherein the weight balance in the shaft longitudinal direction can be reproducibly and easily set and wherein the golf club shaft is produced at a low cost and has high durability. The golf club shaft includes a hollow-cylindrical shaft body made of fiber-reinforced resin and a weight-adding cylinder installed in a cylindrical space of the shaft body. At least a part of an outer diameter side of the weight-adding cylinder is embedded in an cylindrical embedded recess that is formed in an inner wall of the shaft body, wherein a grip-side cylindrical end surface of the weight-adding cylinder and a grip-side cylindrical end surface of the cylindrical embedded recess are in contact with each other.
1. A golf club shaft which includes a metal cylinder entirely made of a metallic material and a hollow-cylindrical shaft body that contains at least a part of said metal cylinder in a longitudinal direction thereof and is formed by thermally curing a plurality of uncured thermosetting resin prepregs wound around said metal cylinder,
wherein said metal cylinder is positioned in a portion of said hollow-cylindrical shaft body in a longitudinal direction thereof, and
wherein at least a part of an outer diameter side of said metal cylinder is embedded in an cylindrical embedded recess that is formed in an inner wall of said shaft body, wherein a grip-side cylindrical end surface of said metal cylinder and a grip-side cylindrical recess end surface of said cylindrical embedded recess are in contact with each other.
2. The golf club shaft according to claim 1 , wherein a tip-side cylindrical end surface of said metal cylinder is exposed with a shaft tip end surface of said shaft body.
3. The golf club shaft according to claim 1 , wherein a tip-side cylindrical end surface of said metal cylinder is in contact with a tip-side cylindrical recess end surface of said cylindrical embedded recess.
4. The golf club shaft according to claim 1 , wherein said metal cylinder is covered with a 0-degree prepreg layer which is positioned on said metal cylinder, and a long fiber direction of which is parallel to a shaft longitudinal direction of said golf club shaft.
5. The golf club shaft according to claim 1 , wherein said a contact length in a radial direction between said grip-side cylindrical end surface of said metal cylinder and said grip-side cylindrical recess end surface of said cylindrical embedded recess ranges from 0.05 mm to 0.5 mm.