Golf club head
AssigneeSRI Sports Limited
InventorMasanori Yabu
Life of this patent
Estimating the term…
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.
Claims9
A hollow metal club head comprising a face portion whose front surface defines a club face for hitting a ball, and a turnback wall extending backward from a 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, a surface area of the club face is in a range of from 4000 to 6500 sq.mm, and 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 of the peripheral zone to a zone rigidity Rh of the front end zone is in a range of from 4.0 to 12.0, wherein
- Rh=Eh×th3
- Rf=Ef×tf3
- Eh is Young's modulus in GPa of the turnback wall in the front end zone,
- th is average thickness in mm of the turnback wall in the front end zone,
- Ef is Young's modulus in GPa of the face portion in the peripheral zone, and
- tf is average thickness in mm of the face portion in the peripheral zone.
Dependencies are inferred from the claim text.