Golf club head

Details Golf club head Golf club head

2002-06-18

2004-04-13

Passaniti, Sebastiano (Department: 3711)

Games using tangible projectile

Golf

Club or club support

C473S349000

Reexamination Certificate

active

06719645

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a golf club head more particularly to a structure of the front of the golf club head being capable of improving the restitution coefficient and durability.
Japanese patent No.3225596 (Publication No.JP-A-5-317466) discloses a golf club head which, as shown in FIG.
9
(A), comprises a face-side member P
1
and a back-side member P
4
. These members P
1
and P
4
are fixed to each other by welding. The face-side member P
1
is made up of a face part P
2
and a part P
3
extending backward therefrom. These parts P
2
and P
3
are molded integral. The part P
3
extending backward has, as shown in FIG.
9
(B), a wedge-shaped cross section of which thickness is gradually decreased from the face side to the rear-side thereof to a value which is in a range of from 1.0 to 1.3 times the thickness of the back-side member P
4
. This structure is intended to avoid breakage of the junction of the face-side member P
1
and back-side member P
4
due to the impact at the time of ball striking.
In recent years, on the other hand, there is a great demand for golf club heads having a high restitution coefficient with respect to the stricken balls as well as durability.
SUMMARY OF THE INVENTION
It is therefore, an object of the present invention to provide a golf club head, in which the restitution coefficient is improved without sacrificing the durability.
According to the present invention, a golf club head comprises a main body and a face member attached to the main body, the face member comprising a main portion and an extended part, the main portion forming a ball striking face, wherein the extended part extending 5 to 30 mm backward from at least part of the edge of the ball striking face, and a thickness of the extended part being less than a thickness of the main portion.


REFERENCES:
patent: 4432549 (1984-02-01), Zebelean
patent: 5028049 (1991-07-01), McKeighen
patent: 5482279 (1996-01-01), Antonious
patent: 5518240 (1996-05-01), Igarashi
patent: 5755627 (1998-05-01), Yamazaki et al.
patent: 5967904 (1999-10-01), Nagai et al.
patent: 6193614 (2001-02-01), Sasamoto et al.
patent: 6228189 (2001-05-01), Oyama et al.
patent: 6322459 (2001-11-01), Nishimura et al.
patent: 6348013 (2002-02-01), Kosmatka
patent: 6354962 (2002-03-01), Galloway et al.
patent: 6443856 (2002-09-01), Galloway et al.
patent: 5-015620 (1993-01-01), None
patent: 8-280854 (1996-10-01), None
patent: 3225596 (2001-08-01), None

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