JPH07112041A - Golf club head - Google Patents

Abstract

PURPOSE:To increase the inertia moment of the golf club head of a wood type and to improve the directivity of a hit ball by forming the sole part, crown part and main body part of the head respectively of separate materials and forming the main body of a material having the largest sp.gr. CONSTITUTION:The sole part 2, crown part 3 and main body part 4 constituting the other parts of the golf club head which internally has a hollow part 1 or is packed with a packing material in this hollow part 1 are respectively formed of the separate materials. At this time, the main body part 4 is formed of the material having the largest sp.gr. The main body part 4 may be increased in the thickness on its lateral peripheral surface to distribute the weight on the periphery. A stainless steel, titanium alloy or copper alloy, magnesium alloy, etc., are used as the material to form this main body part 4. The crown part 3 is formed of the material having the smallest sp.gr., for example, a synthetic resin material and the sole part 2 is formed of aluminum, its alloy, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood type golf club head, and more particularly to a golf club head having a hollow portion inside or a filling material filled in the hollow portion.

[0002]

2. Description of the Related Art In traditional wood type golf club heads made of Persimmon, the main body is made of Persimmon, and the interior of the main body is filled with lead to balance the center of gravity in order to prevent abrasion of the sole. For this, a metal sole plate was fitted, and a face insert was attached to the face surface for reinforcement. The body is not hollow, but is a block of persimmon tree cut out. In addition to such a Persimmon head, it is made of metal material or synthetic resin material,
There is also a hollow head or a hollow head filled with a filler, that is, a head called a metal head or a carbon head. The metal head is usually made entirely of the same material such as stainless steel or titanium, and the carbon head is also made entirely of a synthetic resin material containing carbon fibers, but the length of the reinforcing fibers mixed only in the face part is changed. It was
Recently, a face part made of a different material has been developed.

As compared with the Persimmon head, the metal head and the carbon head are hollow inside, so that the moment of inertia of the head can be made larger than that of the Persimmon head without increasing the weight of the head. The moment of inertia is a force that resists the action of a moving object when it receives an action from the outside and tries to keep a constant movement. In general amateur golfers, the one with a large head inertia moment is off. Even if a center hit occurs, there is little head blurring and the directionality is improved.

In the metal head and the carbon head, the head inertia moment can be increased as described above, but most of them are made of the same material except for the face. Therefore, in order to increase the inertia moment, the entire shape must be increased. Then, the means of making it thin or thickening the surrounding wall without changing the shape was adopted.

[0005]

The conventional means for increasing the moment of inertia is not yet sufficient, and if the overall shape is enlarged and the wall thickness is reduced, a strength problem occurs, and even if the wall thickness is partially increased. If the thickness is too thick, the weight of the head will increase and the balance of the golf club will be poor, or it will be difficult to shake it off. On the contrary, if the thickness is not so great, it will not contribute much to the increase of the moment of inertia.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a golf club head having a large moment of inertia and excellent directionality.

[0007]

In order to achieve the above-mentioned object, the present invention is a wood type golf club head having a hollow portion inside or filled with a filler in the hollow portion. The crown portion and the body portion forming the other portion are formed of different materials, and the material forming the body portion is formed of a material having the highest specific gravity.

[0008]

In the present invention, the main body, the sole, and the crown are made of different materials, and the material of the main body has the highest specific gravity. Therefore, even if the ball hits the toe side, the head shake is small. The directionality of the hit ball is improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

In the embodiment shown in FIG. 1, a sole portion 2, a crown portion 3 and a main body portion 4 constituting the other portion having a hollow portion 1 inside are formed of different materials. The hollow portion 1 may be filled with a filler such as a lightweight foamed resin. Although not shown, the face surface may be made of a material different from that of the main body portion 4. At least the sole portion 2, the crown portion 3, and the main body portion 4 are formed of different materials, and the main body portion 4
The material forming the is formed from the material having the highest specific gravity. The main body portion 4 includes the side peripheral surface of the head. It is also possible to increase the thickness of the side peripheral surface and distribute the weight around the periphery. As a material for forming the main body portion 4, stainless steel, titanium alloy, copper alloy, magnesium alloy or the like can be used. A synthetic resin material is suitable for the crown portion 3.
Further, as the sole portion 2, aluminum or its alloy, which has a smaller specific gravity than the material forming the main body portion 4, is suitable. The crown portion 3 is preferably made of a material having the smallest specific gravity. When a fiber reinforced resin is used as the crown portion 3, it is adhered to the main body portion 4. Also the sole part 2
In this example, the main body 4 was screwed,
It can be attached to the main body portion 4 by means such as welding or fitting.

Although FIG. 2 shows the shape of the sole portion 2, it is not limited to such a shape.

The body 4 is made of stainless steel (7.8 g / cm ³ ).
The used is carbon fiber reinforced resin (1.5 g / cm ³⁾ as a crown portion 3, an aluminum (2.7 g / cm ³⁾ as sole portion 2, the face length is relatively long volume of about A 190 cc head was manufactured. The head weight is lighter than that of a head made of only a stainless material of the same volume, and the head can be shaken off sufficiently. When hitting a ball with such a head, the ball flew straight, even if the ball hits the toe side. Similarly, the direction was also good when hitting the ball on the heel side. Further, if the head has the same weight as the head made of only stainless steel, the volume can be increased.

[0013]

As described above, according to the present invention, the sole portion, the crown portion, and the body portion are formed of different materials, and the material forming the body portion is formed of the material having the highest specific gravity. , The moment of inertia becomes large, and the directionality of the ball is good even if the sweet spot is removed when hitting the ball.

[Brief description of drawings]

FIG. 1 is a sectional view showing a preferred embodiment of the present invention.

FIG. 2 is a perspective view showing a sole portion.

[Explanation of symbols]

 1 Hollow part 2 Sole part 3 Crown part 4 Body part

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Tetsuya Miyajima 3-6-6 Nihonbashi, Chuo-ku, Tokyo Bridgestone Sports Co., Ltd. (72) Inventor Shigeru Watanabe 3-6-6 Nihonbashi, Chuo-ku, Tokyo Bridgeton Sports Within the corporation

Claims (2)

[Claims] 1. A wood type golf club head having a hollow portion inside or a filling material filled in the hollow portion, wherein a sole portion, a crown portion, and a main body portion constituting the other portion are made of different materials. The golf club head is characterized in that the material for forming the main body is made of a material having the highest specific gravity. 2. The golf club head according to claim 1, wherein the material forming the crown portion is formed of a material having the smallest specific gravity.