Patent ID: 7591735
Filing Date: 2009-09-22
Classification: A63B

Abstract:
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.