Golf club
A recess portion is formed on a front side of a head body, and a gel is placed in the recess portion. A face member is fixed on the head body so as to seal the gel in the recess portion. Thus, the gel can be certainly provided on the rearward of the face, whereby a hitting force (striking force) can be improved, while a sound generated when hitting a golf ball can be reduced. The sealed gel sticks to the recess portion without forming any space in a condition that it is pressed therein. Thus, the sound generated when hitting a golf ball can be made uniform, ensuring the transmission of a force for hitting a golf ball.
1. A golf club comprising a head and a shaft, said head having a face, while said shaft being connected to one side of said head, wherein:
said head comprises a face member having said face and a head body with said shaft to be connected thereto;
a recess portion is formed on a front side of said head body for placing a gel therein; and
said face member is fixed on said head body so as to seal said gel in said recess portion,
wherein said gel is formed as a sheet, formed so as to have a front side essentially of the same shape as that of said recess portion, and to have a thickness slightly larger than a depth of said recess portion under atmospheric pressure, whereby said face member is brought to the front side of said recess portion and fixed to the head body so as to seal said gel in said recess portion with the gel being pressed therein.
2. The golf club according to claim 1 , wherein
said face has a degree of hardness greater than or equal to H R C 45, and
wherein said gel is a silicon-based gel having a penetration ratio of about 50–200 according to JIS K2530-1976 under a 50 g load, and in which 25–50 percent by weight of a plurality of hollow and fine spheres made of an organic material is mixed.
3. The golf club according to claim 1 , wherein a thickness of said gel under an atmospheric pressure is greater than 1.0 mm.
4. The golf club according to claim 2 , wherein a thickness of said gel under an atmospheric pressure is greater than 1.0 mm.
5. The golf club according to claim 1 , wherein a Young's modulus of said gel over a thickness thereof is less than 30 to 1500 kPa/mm.
6. The golf club according to claim 2 , wherein a Young's modulus of said gel over a thickness thereof is less than 30 to 1500 kPa/mm.
7. The golf club according to claim 3 , wherein a Young's modulus of said gel over the thickness thereof is less than 30 to 1500 kPa/mm.
8. The golf club according to claim 4 , wherein a Young's modulus of said gel over the thickness thereof is less than 30 to 1500 kPa/mm.