JPH0241003Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a golf club head commonly known as a head or a driver, in particular, by making the inside of the head body hollow, filling this hollow part with foamed synthetic resin, and adding weights on the toe and heel sides. This invention relates to an adjustable golf club head.

Golf club heads, commonly known as wood, are made of synthetic resin mixed with reinforcing fibers instead of natural wood such as persimmon, or made of light metal, from the viewpoint of quality stability and ease of material supply. is beginning to be used.

However, since the specific gravity of synthetic resins or light metals as mentioned above is considerably higher than that of persimmon, etc., a golf club head made of synthetic resin or light metal may have the same external shape and weight as a golf club head made of natural wood. To do this, the inside is hollowed out from the sole side, and the opening on the sole side is closed with a sole plate made of aluminum alloy, brass, etc., and the inside of the closed hollow is made to prevent moisture from entering. The structure is filled with foamed synthetic resin for weight adjustment.

By the way, when filling a synthetic resin such as polyurethane into the hollow part of the head body as described above and foaming and hardening it, it is necessary to attach a sole plate to the head body in advance to prevent the foamed synthetic resin injected into the hollow part from leaking outside. The hollow part must be closed off. For this reason, conventional foamed synthetic resin is injected into the hollow portion using a shaft attachment hole formed in the neck of the head body.

However, using the shaft mounting hole of the net as an injection port for foamed synthetic resin means that the synthetic resin will also be foamed and hardened inside the shaft mounting hole.
The disadvantage is that removal of the cured foamed synthetic resin is troublesome and time-consuming.

Therefore, as shown in Japanese Patent Application Laid-Open No. 51-106528,
A method has been proposed in which the sole plate is temporarily attached by some means without being screwed, and foamed synthetic resin is injected into the screw hole using the screw hole, and then screwed, but this method has the following problems. There is.

In other words, since the head body made of synthetic resin or light metal is integrally molded using a mold, the depth of the step formed to embed the sole plate in the sole of the head body may vary. For this reason, even if the sole plate is fitted into the stepped part and screwed in, there will be a partial step at the boundary between the sole plate and the sole part, and this step will have to be cut with a grinder etc. during the finishing process of the head body. must be removed. However, when the sole plate and the stepped portion of the sole part are cut with a grinder or the like, the sole part and the sole plate are heated to a considerable temperature by the cutting heat.
There is a problem that the foamed synthetic resin that has hardened in contact with the sole part and sole plate partially melts, creating a gap in the hollow part and causing the filled foamed synthetic resin to wobble. There is a risk that the resin will block the hole and cause problems in threading the screw.

Further, in this type of club head, it is impossible to set the weight and the weight balance between the toe and heel portions unless the volume and shape of the hollow portion are changed.

This idea was devised in view of the above points, and its purpose is to attach the sole plate to the head body having a hollow part, and after finishing the sole surface including the sole plate, to form a foam compound into the hollow part. To provide a golf club head in which resin can be easily injected without affecting the assembly of head components, and weight and weight balance can be easily adjusted.

In order to achieve the above object, the golf club head of this invention has a weight which communicates with a hollow part on the toe and heel side of the sole part other than the part covered by the sole plate of the head body and which also serves as an inlet for injection of foamed synthetic resin. A mounting hole is formed, and a weight adjustment member is screwed into the mounting hole in a removable manner.

Hereinafter, specific embodiments of this invention will be described based on the drawings.

Figures 1 and 2 show an example of a golf club head according to this invention, and 1 is a head body integrally molded from a synthetic resin mixed with reinforcing fibers such as carbon or a light metal such as aluminum alloy; This head body 1 is formed with a hollow portion 3 that opens toward the sole portion 2, and this hollow portion 3 is used to reduce the weight of the head body 1 and adjust the weight balance. A fitting step 5 that matches the outline of the sole plate 4 that closes the opening 3a of the hollow portion 3 is formed in the sole portion 2, and after the sole plate 4 is fitted into the fitting step 5, the sole plate 4 (not shown) is fitted into the fitting step 5. By screwing the tapping screw into the pilot hole 6 provided in the sole part 2, the sole plate 4
is integrally fixed to the head body 1. In addition, the sole surface including the boundary 5a between the sole plate 4 and the stepped portion 5 after the sole plate 4 is attached is finished by grinding, etc. Part 2
It is designed to remove the difference in level between the two.

Further, in the toe 1a and heel 1b side portions 2a, 2b of the sole portion 2 other than the portion covered by the sole plate 4, there are weight attachment holes 8a that communicate with the hollow portion 3 and also serve as injection ports for the foamed synthetic resin 7. ,8
b are drilled respectively, and each weight mounting hole 8
Female threads 9a, 9b are carved into the inner wall surfaces of a, 8b, and each weight mounting hole 8a, 8b has a weight adjustment hole for adjusting the weight of the head body 1 and the weight balance between the toe 1a and the heel 1b. The members 10a and 10b are screwed together in a removable manner.

In the golf club head constructed as described above, when the synthetic resin is foamed and hardened in the hollow portion 3, the sole plate 4 is fitted into the step 5 of the sole portion 2 of the head body 1 as described above. ,
After fixing with tapping screws, etc., the entire sole surface including the sole plate is finished. Next, after injecting a predetermined amount of foamed synthetic resin 7 such as polyurethane into the hollow part 3 closed by the sole plate 4 through one or both of the weight attachment holes 8a and 8b, the weight adjustment member 10a of the desired weight, 1
0b into the respective weight mounting holes 8a and 8b. Foamed synthetic resin 7 injected into hollow part 3
is foamed and cured at room temperature (20 to 25° C.), thereby saturating the inside of the hollow portion 3 with the foamed synthetic resin.

In addition, when adjusting the weight of the head body 1 or the weight balance between the toe side and the heel side according to the player's height, weight, physical condition, etc., the weight adjustment members 10a and 10b whose individual weights are set in advance are used. All you have to do is select one and screw it into each weight mounting hole 8a, 8b.

As the weight adjustment member 10a, there is one shown in FIG. 3, among which the weight adjustment member 10a shown in FIG. 3 is molded from brass, and the weight adjustment member 10a shown in FIG. The weight of these decreases from a to c. Further, FIG. 4 shows an example of the weight adjusting member 10b, and FIG.
The one shown in b is molded from brass, and the one shown in c is entirely made of aluminum. The weight of these becomes lighter as you go from a to c.

As described above, according to the golf club head of this invention, the weight mounting hole communicating with the hollow part is formed on the toe and heel side of the sole part other than the part covered by the sole plate of the head body. It becomes possible to inject the foamed synthetic resin into the hollow part by using this method, which makes the injection work of the foamed synthetic resin easy and has good workability, and also eliminates the above-mentioned drawbacks of the conventional method. In addition, a weight adjustment member with a preset weight can be selectively attached to each weight attachment hole that also serves as injection of foamed synthetic resin, so the weight and weight balance of the head body can be adjusted to suit the player. It has an effect that can be adjusted.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing an example of the golf club head according to this invention, Fig. 2 is a bottom view of the golf club head according to this invention with the sole plate removed, and Figs. It is an explanatory view showing an example of the weight adjustment member applied to the invention. 1... Head body, 1a... Toe, 1b... Heel, 2... Sole part, 3... Hollow part, 4... Sole plate, 5... Step part, 8a, 8b... Weight mounting hole, 10a , 10b... Weight adjustment member.

Claims (1)

[Scope of utility model registration request] In a golf club head equipped with a head body having a hollow part whose main purpose is to reduce weight, and a sole plate attached to close the hollow part, the toe and the sole part of the head body other than the part covered by the sole plate are Each weight mounting hole is formed on the heel side to communicate with the hollow part and also serves as an injection port for the foamed synthetic resin, and a weight adjustment member is removably screwed into each weight mounting hole. Golf club head.