Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Masanori Yabu0
Date of Patent
August 29, 2006
0Patent Application Number
107668360
Date Filed
January 30, 2004
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A hollow metal club head comprises a face portion whose front surface defines the club face, and a turnback wall extending backward from the circumferential edge of the face portion, wherein a head volume is in a range of not less than 440 cc, a height of the club face is in a range of from 55 to 85 mm, and a surface area of the club face is in a range of from 4000 to 6500 sq. mm. In a front end zone of the turnback wall and a peripheral zone of the face portion which are adjacent to each other through a junction between the turnback wall and the face portion, the ratio Rf/Rh of a zone rigidity Rf=(Ef×tf3) of the peripheral zone to a zone rigidity Rh=(Eh×th3) of the front end zone is in a range of from 4.0 to 12.0.
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