Golf club shaft and golf club

Abstract

A golf club shaft is formed by curing wound fiber-containing prepregs and has a tip side and a butt side. In an embodiment, the prepregs include pitch-based carbon fiber-containing prepregs with a low elastic modulus, which are wound on the tip side, and polyacrylonitrile (PAN) based carbon fiber-containing prepregs, which are wound in an outermost layer on the tip side. In another embodiment, the prepregs include low-elasticity carbon fiber-containing prepregs wound on the tip side, and high-elasticity carbon fiber-containing prepregs wound on the butt side. In yet another embodiment, the prepregs include low-elasticity carbon-containing prepregs, which are wound on the butt side, and high elasticity carbon-containing prepregs, which are wound on the tip side.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This Application claims priorities from Japanese Patent Application No. 2012-075703 filed Mar. 29, 2012, Japanese Patent Application No. 2012-075704 filed Mar. 29, 2012, and Japanese Patent Application No. 2012-075705 filed Mar. 29, 2012, which are incorporated herein by reference in their entirety.BACKGROUND OF THE INVENTION[0002]The present invention relates to a golf club shaft, more particularly to a fiber reinforced resin-made golf club shaft, and to a golf club including the fiber reinforced resin-made golf club shaft.[0003]As shown in FIG. 2, a golf club 1 includes a shaft 3, which is mounted to a head 2. A grip 4 is provided on a trailing edge side (i.e., butt side) of the shaft 3. As shown in FIG. 3, in mounting the shaft 3 to the head 2, an epoxy-based adhesive 5 or the like is applied to a leading edge of the shaft 3, the shaft 3 is inserted into a hozel hole 6 of the head 2 and then the adhesive 5 is cured. FIGS. 2 and 3 illust...

AI Technical Summary

Benefits of technology

The present invention provides a golf club shaft with low-elasticity carbon fibers on the butt side and high-elasticity carbon fibers on the tip side. This results in a more stable and satisfactory appearance when hitting the ball at a high speed. The configuration allows for deformation of the shaft to occur across the entire shaft instead of just the tip, resulting in more consistent and accurate hit ball trajectories.

Problems solved by technology

In addition, if pitch-based carbon fibers having a fiber diameter larger than that of PAN-based carbon fibers are used, the surface of the fibers may become hairy when the shaft is ground to adjust the diameter of the shaft, which may result in degraded appearance of the shaft.

Therefore, it becomes less easy for a player of less power to swing a golf club with such a shaft.

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