JPH0323256Y2 - - 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 head of a golf wood club with an outer shell made of (abbreviated as FRP), we have improved the impact resistance by devising the mounting structure of the sole plate that is fixed to the sole surface of the head body. This is to prevent the material from falling off.

Conventionally, in this type of wood club head, as illustrated in FIG. 1, the outer shell of the head body 1 is made of FRP2, and the sole surface 1a is provided with a sole plate made of a metal material such as brass or aluminum alloy. In addition to adjusting the weight of the head body 1, the sole can be prevented from external force by fixing the head body 1 with screws 4, or by fitting and fixing it into the recess 21 formed in the FRP outer shell 2, as shown in FIG. It has a structure in which the surface 1a is protected.

However, with such a conventional structure, in the former case, when a lateral force (in the direction of ball hitting) is applied to the sole plate 3 due to inertia caused by the impact when the ball is hit, the outer shell of the head body 1 is formed.
Since the FRP 2 has a thin structure, even if the length of the screw 4 is increased, the screw retention effect by the FRP 2 cannot be expected to be large, and the sole plate 3 is likely to fall off after long-term use. In addition, due to the molding of the head body 1, for example, the shape of the head body 1 may be
When the core is hollow-molded when the outer shell is molded using FRP2, or when the foamed synthetic resin that will serve as the core material is injected into the hollow core after the FRP outer shell is molded, a large amount of If a hole with a certain diameter is made, it is necessary to attach a sole plate to the sole surface 1a of the head body 1 for reinforcement, but it is not enough to simply attach a sole plate to cover up the hole.
A shearing force acts on the joint surface between the FRP outer shell and the sole plate, and the FRP outer shell is not significantly reinforced by the sole plate. On the other hand, in the latter case,
Although it has the effect of reinforcing the outer shell against impact resistance due to lateral forces, the entire circumference of the sole is not covered because it is fitted into the FRP outer shell, so it cannot be expected to have a protective effect on the outer peripheral edge of the sole surface 1a of the head body. There were various problems such as not being able to do it.

This invention was aimed at solving the above-mentioned conventional drawbacks, and its gist is that it includes a head body made of an FRP outer shell and a sole plate attached to the sole surface of the head body. A recess formed by a single circular hole is formed in the center of the sole surface of the head body by penetrating the FRP outer shell, and a cylindrical truncated part is formed to protrude from the recess corresponding to the back surface of the sole plate. The sole plate is attached by fitting the convex portions and fixing the sole plate with a screw that is screwed through the FRP outer shell at a position spaced apart from the convex-concave fitting portion between the convex portion and the concave portion. It is characterized by improving its strength and preventing it from falling off.

Next, this invention will be explained based on the embodiment shown in FIG. 3 and subsequent figures.

As shown in FIGS. 3 and 4, numeral 10 in the figures is the head body of the golf wood club according to this invention. The head body 10 has a hollow core or a core material 11 made of foamed synthetic resin or the like as in the illustrated embodiment.
The outer shell has a shell structure made of FRP12. A recess 13 consisting of one circular hole is formed in the center of the sole surface 10a of the head main body 10 so as to pass through the FRP outer shell 12. Alternatively, a sole plate 14 made of a metal material such as an aluminum alloy is attached.

On the back surface of this sole plate 14, that is, on the back surface corresponding to the inner surface facing the FRP outer shell 12 of the head main body 10, there is a recess 13 consisting of a circular hole formed in the center of the sole surface 10a of the head main body 10. A cylindrical trapezoidal convex portion 15 is located at a position corresponding to
is integrally formed in a protruding manner, and the convex portion 15 is tightly fitted into the concave portion 13, and the sole plate 14 is placed at a position spaced apart from the concave-convex fitting portion between the convex portion 15 and the concave portion 13. FRP
Screws 16, 16 that penetrate and are screwed into the outer shell 12
It has a structure in which it is firmly fixed.

According to the above-mentioned configuration according to this invention, for example, for convenience in molding the head body 10, a recess 13 consisting of a circular hole having a large diameter is formed through the FRP outer shell of the sole surface 10a of the head body 10. Even if the sole plate 14 is fixed to this recess 13, the sole plate 14
Since the cylindrical truncated convex portion 15 provided on the back side of the head body is filled by fitting into the concave and convex portions, the sole surface 10a of the head main body
The sole plate 14 can be attached while supplementing the strength of the FRP outer shell.

In the explanation of this invention based on the above-mentioned embodiments, the structure of the sole plate was explained as being made of a metal material such as brass or an aluminum alloy. This does not necessarily indicate that the sole plate should be formed using a metal material, but if a metal material is used in a part necessary to meet the functional requirements of the sole plate, such as protecting the underside of the head or adjusting the weight, The effects of this invention can also be obtained by using a composite structure made of two types of metal and synthetic resin, using fiber-reinforced synthetic resin as necessary for the remaining parts.

As explained above, according to this idea,
Since the sole plate is attached to the sole surface of the head body made of an FRP outer shell by fitting the sole plate into a convex-concave shape, the concave-convex fitting part of the two prevents the sole plate from shifting in the lateral direction due to inertia due to the impact when the ball is hit. Movement can be suppressed, and even if the FRP outer shell is thin, the installation strength can be increased, and the recesses such as holes are filled with protrusions made of metal on almost the entire circumference. , Even if there are holes in the outer shell, the overall state is almost the same as that of a continuous shell, so the reinforcing effect of the outer shell is improved, making it possible to prevent the sole plate from falling off like in the past, etc. It has excellent practical effects.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the essential parts of an example of a conventional golf club, Fig. 2 is a sectional view of the essential parts of another similar example, and Fig. 3 is an embodiment of the golf club according to the invention. FIG. 4 is a sectional view of the main parts shown, and FIG. 4 is a perspective view of the sole plate. 10...Head body, 10a...Sole surface, 11...
Core material, 12...FRP outer shell, 13...recess, 14...sole plate, 15...protrusion, 16...screw.

Claims (1)

[Claims for Utility Model Registration] A head body made of an FRP outer shell, a sole plate attached to the sole surface of the head body, and a circular hole formed in the center of the sole surface of the head body. A concave portion is formed by penetrating the FRP outer shell, and a cylindrical trapezoidal convex portion formed to protrude corresponding to the back surface of the sole plate is fitted into this concave portion, and the convex portion and the concave portion are fitted into the concave portion. 1. A head structure for a golf club, characterized in that the sole plate is fixed to the FRP outer shell by a screw that is screwed through the FRP outer shell at a position apart from the outer shell.