JPH0246224B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a golf club head made of a metal material and having a hollow portion inside.

Traditionally, this type of hollow metal head has been formed by casting, which causes variations in head weight and does not result in a constant head weight. Therefore, in order to maintain a constant head weight, the weight of the head after casting is set in advance to be lighter than the desired weight, and particulate lead is placed in the lower part of the hollow part of the head. The remaining hollow part is filled with polyurethane foam resin to reinforce the relatively thin head and to fix the lead, and by adjusting the amount of lead,
The head weight was being adjusted. Such head weight adjustment is necessary in order to select an appropriate head for various club lengths, balances, shaft materials, etc.

However, although the lead is temporarily fixed by the polyurethane foam resin, due to the presence of the foam,
The fixation was not reliable, and when the golf club was used repeatedly, the lead could move inside the hollow part of the head, which caused unpleasant noises during play. .

In view of the above points, an object of the present invention is to provide a head of a golf club in which metal particles for weight adjustment are securely fixed to the head in order to prevent the phenomenon of generating unpleasant sounds. .

Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of a hollow metal head 1, which includes a sole 2, a neck 3, a ball-striking surface 4, and the like.
have. As shown in FIG. 2, this hollow metal head 1 consists of an upper head body 7 consisting of a relatively thick ball-hitting surface 4 and a top surface 5 and having a hollow portion 6 therein, and a sole plate 8. . These upper head body 7 and sole plate 8 are formed by casting,
The hollow metal head 1 is formed by fixing a sole plate 8 to the open end of the hollow portion 6 of the upper head body 7.

To adjust the weight of the hollow metal head 1, first insert an arbitrary amount of high-density metal particles 10 such as lead, tungsten, or zinc into the hollow part 6 through the shaft insertion hole 9 of the neck 3, and A non-foaming synthetic resin 11 such as epoxy resin, polyurethane foam resin, acrylic resin, or polyester resin flows through the shaft insertion hole 9 and is impregnated between the metal particles 10 to form the synthetic resin 1.
This is done by curing 1. Therefore, the surface of the metal particles 10 is coated with the synthetic resin 11 without forming any voids between the metal particles 10,
It is flatly fixed to the inner wall of the sole 2 of the hollow metal head 1. Thereafter, a foamed resin, typically a polyurethane foamed resin, is flowed into the remaining portion of the hollow portion 6 through the shaft insertion hole 9 to cause a foaming action, and the foamed resin body 12 fills the remaining hollow portion. 6 to reinforce the hollow metal head 1.

In this way, the metal particles 10 for weight adjustment are made of non-foaming synthetic resin 1 that easily gets between the particles 10.
Since the cover is fixed at step 1, the fixation is ensured.

In the above embodiment, the metal particles 10 were flatly fixed to the inner wall of the sole 2 of the hollow metal head 1, but as in another embodiment shown in FIG.
The center of gravity of the head is adjusted so that the metal particles 10 are unevenly distributed on the inner wall of the sole 2 near the ball hitting surface 4, and the metal particles 10 are fixed with a synthetic resin 11, and the center of gravity is brought closer to the ball hitting surface and the sole surface and the sweet spot is moved below the head. It is also possible to do it at the same time.

In addition, after adjusting the head weight using the above method, if further weight adjustment or center of gravity balance adjustment becomes necessary, as shown in FIG. 4, the sole plate 8 A screw receiving hole 13 is formed in the
Correction can be made by selecting and screwing into this screw receiving hole 13 an appropriate screw from among various weight correction screws 14 having different weights.

The present invention is constructed as described above, and in particular, metal particles are coated and fixed on any part of the inner wall of the hollow part of a hollow metal head with a non-foaming synthetic resin impregnated between the particles, and the remaining hollow parts are fixed. Since the part is filled with foamed resin, the metal particles for weight adjustment can be securely fixed in the head, and it is possible to provide a golf club head that does not have the risk of producing unpleasant noises during play unlike conventional ones. It is.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a sectional view of the same embodiment, and FIGS. 3 and 4 are sectional views showing other embodiments. 1...Hollow metal head, 6...Hollow part, 10...
...Metal particles, 11...Non-foaming synthetic resin, 12
...Foamed resin body.

Claims (1)

[Scope of Claims] 1 Metal particles 10 are coated and fixed on any part of the inner wall of the hollow part 6 of the hollow metal head 1 with a non-foaming synthetic resin 11 impregnated between the particles 10, and the remaining hollow A golf club head in which a portion 6 is filled with a foamed resin body 12. 2. The golf club head according to claim 1, wherein the metal particles 10 are fixed to the inner wall of the sole 2 of the hollow metal head 1 near the ball hitting surface 4. 3. The golf club head according to claim 1 or 2, wherein the metal particles 10 are high-density particles of lead, tungsten, or zinc. 4 The non-foaming synthetic resin 11 is epoxy resin, polyurethane resin, or acrylic resin,
or a golf club head according to claim 1, which uses polyester resin. 5. The golf club head according to claim 1, wherein the foamed resin body 12 is made of polyurethane foamed resin.