JPH0317898Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is based on fiber-reinforced plastics (hereinafter referred to as
Regarding the structure of the neck part of a wood club head for golf with an outer shell made of FRP (abbreviated as FRP), an improvement is made to the reinforcing fiber arrangement of the FRP outer shell that constitutes the neck part of the head body into which the club shaft is inserted and fixed. This is intended to improve the adhesion to the club shaft, the bending rigidity of the neck portion, and the tensile rigidity in the circumferential direction.

Conventionally, in this type of wood club head, the outer shell of the head body is made of carbon fiber reinforced plastics (hereinafter abbreviated as CFRP) using carbon fibers woven in a hollow weave as reinforcing fibers.
A shaft insertion hole is formed in the neck portion of the head body, and a metal or
Some are made by inserting a club shaft made of CFRP and fixing it with adhesive.

However, in such a conventional structure, since the reinforcing fibers that make up the FRP outer shell of the head body are woven in a hollow weave, it is necessary to use multiple reinforcing fibers, especially in the cylindrical neck part. When stacking and laminating, the whole is laminated so that it is wound in both right-handed and left-handed directions with a spiral fiber arrangement around the shaft axis, which makes it possible to increase the bending rigidity contribution of the neck part. On the other hand, the fiber reinforcement effect in the circumferential direction of the shaft is insufficient, and the tensile strength and elasticity in the circumferential direction of the neck are likely to be insufficient. Furthermore, among the reinforcing fibers that are arranged along the shaft axis direction, such as obliquely, those located near the shaft axis are disadvantageous in terms of bending rigidity because they are close to the neutral axis when the neck bends and deforms. When the active surface of the inner circumferential surface of the shaft insertion hole formed in the neck part was milled to improve adhesion to the club shaft, the reinforcing fibers that were laminated and wound in a spiral pattern were damaged and the stiffness contribution ratio was reduced. It has the disadvantage that it tends to cause a decrease in

This invention is aimed at solving the above-mentioned conventional drawbacks, and will be explained below based on the illustrated embodiment.

As shown in FIGS. 1 and 2, numeral 1 in the figures is the head body of the golf wood club according to this invention. The head main body 1 is composed of a core material 2 made of, for example, foamed synthetic resin, and an FRP outer shell 3 having a plurality of layered structures and coated around the core material 2, and has a shaft in its neck portion 1a. An insertion hole 4 is formed, and a club shaft 5 is inserted and fixed into the shaft insertion hole 4 by an adhesive film a.

Consists of the neck portion 1a of the head main body 1.
The FRP outer shell 3 has a fiber-reinforced structure formed by laminating a plurality of reinforcing fibers, and the innermost reinforcing fibers on the inner peripheral wall side of the shaft insertion hole 4 are made of glass fiber. It constitutes a plastic layer (hereinafter abbreviated as GFRP layer) 31, and its fiber arrangement is arranged almost along the circumferential direction of the shaft, while the innermost GFRP layer 31
The reinforcing fibers to be laminated on the outside of the shaft are made of a single bag-weave carbon fiber or a composite fiber of carbon fiber and glass fiber, and have a fiber arrangement that can be spirally wound from both the right and left directions around the shaft axis.
It constitutes the CFRP layer 32.

Therefore, according to the above-mentioned configuration according to this invention, the FRP outer shell is attached to the neck part of the head body, and the inner layer part made of GFRP which uses glass fibers as reinforcing fibers and has fibers arranged in the circumferential direction of the shaft axis. The carbon fibers of the hollow weave are used as reinforcing fibers to form an integral structure with the outer layer of CFRP, which has a fiber arrangement spirally wound around the shaft axis. Tensile rigidity and strength can be improved, cracking of the neck portion can be prevented, and since the inner circumferential wall of the shaft insertion hole is formed of GFRP, adhesiveness with the club shaft can be improved. Also, when machining the shaft insertion hole on the active surface,
Since the innermost circumferential layer is made of GFRP with fibers arranged in the circumferential direction, even if the reinforcing fibers are slightly damaged, the outer reinforcing fibers wound in a spiral pattern will not be damaged, and the stiffness contribution ratio is lower than that of conventional ones. can prevent a decline in
Furthermore, the reinforcing fibers of CFRP along the shaft axis direction are located further away from the shaft axis through the inner GFRP layer, which improves the bending rigidity of the neck, which has excellent practical effects. It is something.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a wood club head for golf according to this invention, and FIG. 2 is an enlarged sectional view taken along the line of FIG. 1. 1...Head body, 2...Core material, 3...FRP outer shell,
31...GFRP inner layer, 32...CFRP outer layer, 4...
Shaft insertion hole, 5...club shaft.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In the neck portion of the club head, which is made of an FRP outer shell made of multiple layers of reinforcing fibers, the reinforcing fibers on the innermost periphery of the shaft insertion hole through which the club shaft is inserted and bonded. 1. A wood club head for golf, characterized in that reinforcing fibers are arranged in a spiral direction and outer reinforcing fibers are arranged in a spiral manner. (2) In the wood club head for golf according to claim 1 of the utility model registration, reinforcing fibers are wound spirally around the outside of the FRP shell and are arranged in both right-handed and left-handed directions. A head characterized by: (3) Scope of utility model registration claims, paragraph 1 or 2
3. The wood club head for golf according to any one of Items 1 to 9, wherein the innermost reinforcing fibers are glass fibers, and the outer reinforcing fibers are carbon fibers.