JP2949691B2 - Golf club head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In a wood golf club head made of Persimmon, which has been used for a long time, the main body is formed of persimmon, and the inside of the main body is filled with lead to maintain a balance. A metal sole plate was fitted for the purpose, and a face insert was attached to the face surface for reinforcement. The body is not hollow, but is a lump of persimmon wood. In addition to such persimmon head, it is made of metal material or synthetic resin material,
Some are hollow or hollow and filled with a filler, that is, a metal head or a carbon head. The metal head is usually formed entirely of the same material such as stainless steel or titanium, and the carbon head is also formed entirely of a synthetic resin material containing carbon fibers. Was.
Also, recently, a face portion formed of a different material has been developed.

[0003] Compared with the persimmon head, the metal head and the carbon head are hollow, so that the moment of inertia of the head can be made larger than that of the persimmon head without increasing the head weight. The moment of inertia is a force that, when a moving object is acted upon from the outside, resists the effect and tries to keep a constant movement.For general amateur golfers, the one with the larger head moment of inertia is off. Even in the case of a center hit, the head is less shaken and the directionality is improved.

In a metal head or a carbon head, the head moment of inertia can be increased as described above. However, most of the head and the head are made of the same material except for the face. Means of reducing the thickness and increasing the peripheral thickness without changing the shape have been adopted.

[0005]

The conventional means for increasing the moment of inertia is not yet sufficient. If the entire shape is made large and the wall thickness is reduced, a strength problem occurs. If the thickness is too large, the head weight increases and the balance as a golf club deteriorates, or it becomes difficult to shake off the golf club. Conversely, if it is not too thick, it does not contribute much to an increase in the moment of inertia.

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

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a wood type golf club head having a hollow portion inside or a hollow portion filled with a filler. The crown portion and the main body constituting the other portions are formed from different materials, respectively, and the material forming the main body is formed from the material having the highest specific gravity.

[0008]

According to 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 largest specific gravity. The direction of the hit ball is improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments 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 other portions having a hollow portion 1 therein 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 4. At least the sole portion 2, the crown portion 3, and the main body portion 4 are formed of different materials, respectively.
Is formed from the material having the largest specific gravity. The main body 4 includes a side peripheral surface of the head. By increasing the thickness of the side peripheral surface, weight can be distributed to the periphery. Stainless steel, titanium alloy, copper alloy, magnesium alloy, or the like can be used as a material for forming the main body 4. The crown portion 3 is preferably made of a synthetic resin material.
Further, as the sole portion 2, aluminum or an alloy thereof having a lower specific gravity than the material forming the main body portion 4 is preferable. It is desirable to use a material having the smallest specific gravity for the crown portion 3. When a fiber reinforced resin is used for the crown 3, the crown 3 is adhered to the main body 4. In addition, sole part 2
In this example, the main body 4 was screwed,
It can be attached to the main body 4 by means such as welding or fitting.

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

The main 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 weight of the head is lighter than that of a normal head made of only the same volume of stainless steel material, and the head can be sufficiently shaken off. When hitting the ball with such a head, the ball flew straight, even if the ball hit the toe. Similarly, the direction was good when hitting the ball on the heel side. If the weight is the same as that of the head made of stainless steel alone, the volume can be increased.

[0013]

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

[Brief description of the 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]

 DESCRIPTION OF SYMBOLS 1 Hollow part 2 Sole part 3 Crown part 4 Main part

──────────────────────────────────────────────────続 き Continued on the 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 Bridgestone Sports (56) References JP-A-2-21882 (JP, A) JP-A-5-57034 (JP, A) JP-A-4-75567 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) A63B 53/04 A63B 53/06

Claims (2)

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