| US 7,591,735 B2 | ||
| Golf club head | ||
| Hideo Matsunaga, Saitama (Japan); Wataru Ban, Saitama (Japan); and Hideo Shimazaki, Tokyo (Japan) | ||
| Assigned to Bridgestone Sports Co., Ltd., Tokyo (Japan) | ||
| Filed on May 18, 2006, as Appl. No. 11/435,984. | ||
| Claims priority of application No. 2005-351281 (JP), filed on Dec. 05, 2005. | ||
| Prior Publication US 2007/0129168 A1, Jun. 07, 2007 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. A63B 53/04 (2006.01) | ||
| U.S. Cl. 473—329 [473/332; 473/350] | 8 Claims |
| 1. An iron type go if club head comprising:
a head main body having a front surface side and a rear surface side;
a face plate fixed to the front surface side of said head main body to form a face surface of said golf club head;
a cavity portion formed in said head main body, said cavity portion open to the front surface side and closed by the rear
surface side; and
a viscoelastic body inserted in a compressed state in a space formed by said cavity portion,
wherein said viscoelastic body is made by mixing a plurality of types of viscoelastic materials with loss coefficients temperature
dependences of which are different, and
wherein an axial edge on the front surface of a circumferential wall defining said cavity portion comprises:
a contacting portion that contacts a rear surface of said face plate; and
a non-contacting portion spaced apart from the rear surface of said face plate to form a gap between said non-contacting portion
and the rear surface of said face plate, the gap communicating with said cavity portion and allowing extension of the viscoelastic
body into itself.
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