JPH0242307Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of a head for a golf club.
In particular, it provides an excellent alternative to wood heads.

In the past, persimmon trees were mainly used for golf heads, but due to their dimensions, persimmon trees that can be used as heads are very small and difficult to obtain, and since they are made of wood, they are easily affected by moisture, making it difficult to use them. There are also concerns about poor balance and the occurrence of cracks, and in recent years, the use of carbon or glass fiber reinforced plastics has been considered.

However, the specific gravity of carbon or glass fiber reinforced plastics is higher than that of persimmon wood, and golf clubs that use heads that can be molded from such plastics have the problem of being unbalanced towards the head side. It has been proposed to reduce the weight of the head by embedding a foam core with a low specific gravity.

Incidentally, the position of the center of gravity in a golf club head is an important factor that influences the directionality of the head, and it has been known to provide a center of gravity adjustment layer between the soul plate and the head body.

However, in the head in which the foam core is embedded as described above, even if the height of the foam core is changed, the volume of the foam core can be kept constant by changing the cross-sectional area of the foam core. It is possible to reduce the weight of the head without being constrained by
By changing the height of the foam core, the position of the center of gravity of the head can be changed, and as a result, both the balance and the position of the center of gravity of the head can be adjusted. However, when the outer contour of the head is fixed and the height of the foam core is high or the cross-sectional area is large,
Since the wall thickness of the head body (fiber-reinforced plastic part) is thinner and lacks mechanical strength against impact, there is a problem in adjusting the center of gravity that requires the dimensions of a foam core. It is advantageous to provide a separate center-of-gravity adjustment layer, without relying on this.

The fiber-reinforced plastic head for a golf club according to the present invention was devised based on such an idea, and is a golf club head in which a foam core is provided within a fiber-reinforced plastic outer shell and a soul plate is attached to the foam core. The club head is characterized in that a center of gravity adjustment layer having a higher specific gravity than the foam core is interposed between the foam core and the soul plate in contact with the soul plate, and the soul plate is fixed to the center of gravity adjustment layer with pins. It is configured to do this.

The present invention will be explained below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a head outer cover made of carbon or glass fiber reinforced plastic, in which a core loading hole 11 is provided. 2 is a foam core loaded into the core loading hole 11, 3 is a metal soul plate, and 4 is a center of gravity adjustment layer, which is made of a material with a higher specific gravity than the foam core 2, and the soul plate 3 and the foam core 2 is interposed between.

To manufacture this head for a golf club, for example, the head outer cover 1 is molded, the foam core 2 is
and the center of gravity adjustment layer 4 are fixed with an adhesive, and the center of gravity adjustment layer 4 and the soul plate 3 are fixed with a pin to integrate the foam core 2, the center of gravity adjustment layer 4, and the soul plate 3, and then this integration is performed. The foam core 2 of the product is loaded into the hole 11 of the head jacket 1 and bonded together with an adhesive. As the pin, a taper pin, a pin with a protrusion as shown in FIG. 2, a screw, a screw, a bolt, etc. can be used.

In the above, carbon or glass fiber with a length of 0.2 to 35 mm is used for the fiber-reinforced plastic of the head outer cover 1, and epoxy resin or polyester resin is used for the plastic, and the fiber amount is 5 to 60 mm. % by weight can be used.

For the foam core 2, hard urethane foam, vinyl chloride foam, ABS foam, EVA foam, styrene foam, etc. can be used.

The above-mentioned Primics is used for the center of gravity adjustment layer 4, but its specific gravity is usually different from the specific gravity of the head envelope 1.

In Fig. 1, the distance of the center of gravity of the head outer cover 1 from the lower surface of the soul plate, the distance of the center of gravity of the foam core 2, the distance of the center of gravity of the soul plate 3, and the distance of the center of gravity of the center of gravity adjustment layer 4 are respectively X ₁ and X ₂ . ，
If X ₃ and X ₄ are the weight of the head outer cover 1, the weight of the foam core 2, the weight of the soul plate 3, and the weight of the center of gravity adjustment layer 4 are respectively W ₁ , W ₂ , W ₃ , and W ₄ , then the total The _{center of} gravity _distance X is: X= _X1W1 + _X2W2 + _X1W3 + _X4W4 / _W1 + _W2 + _{W3 + W4} .

Therefore, the entire center of gravity position O can be adjusted by adjusting the thickness or weight of the center of gravity adjustment layer 4.

However, even if there is no center of gravity adjustment layer,
Adjustment of the center of gravity position is possible by adjusting the specific gravity or dimensions of the foam core, but variations in the pore size of the head jacket, and therefore the thickness of the head jacket, are unavoidable, and the Severe impairment becomes a problem. However, according to the present invention, there is no such problem,
You can easily adjust the center of gravity.

In addition, the thickness and specific gravity of the layer contribute to the adjustment of the center of gravity position of the head by the above-mentioned center of gravity adjustment layer in a certain relationship, and the specific gravity is set to be the same as that of the head outer cover, and adjustment is made only by the layer thickness. You can also do that.

FIG. 2 shows another embodiment of the present invention, in which the soul plate 3 is connected between the soul plate 3 and the center of gravity adjustment layer 4.
The soul plate 3 and the foam core 2 are fixed by the pins 31 provided in the
It is reinforced by needles 32, . . . provided at 1, .

As described above, according to the present invention, in a golf club head made of fiber-reinforced plastic, not only the weight of the head but also the center of gravity can be easily adjusted by maintaining the thickness of the fiber-reinforced plastic jacket sufficiently, and the balance can be improved. It is possible to provide a golf club head made of fiber-reinforced plastic that is excellent not only in properties but also in directionality. In addition, the center of gravity adjustment layer (manufactured by Premix) is in contact with the soul plate and both are fixed with screws, etc., so the soul plate can be bent and reinforced by the center of gravity adjustment layer, which allows the soul plate to be made thinner, making the head even thinner. Lighter weight can be achieved.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are explanatory diagrams each showing an embodiment of a golf club head according to the present invention. In the figure, 1 is a fiber-reinforced plastic outer jacket, 2 is a foam core, 3 is a soul plate, and 4 is a center of gravity adjustment layer.

Claims (1)

[Scope of utility model registration request] In a golf club head in which a foam core is provided in a fiber-reinforced plastic outer shell and a soul plate is attached to the foam core, a center of gravity adjusting layer having a specific gravity higher than that of the foam core is provided between the foam core and the soul plate. interpose in contact with the plate,
A fiber-reinforced plastic golf club head characterized by a soul plate fixed to the center of gravity adjustment layer with pins.