US2008161124A1PendingUtilityA1

Wood golf club head

Assignee: BRIDGESTONE SPORTS CO LTDPriority: Dec 27, 2006Filed: Oct 31, 2007Published: Jul 3, 2008
Est. expiryDec 27, 2026(~0.4 yrs left)· nominal 20-yr term from priority
Inventors:Ryota Kajita
A63B 53/0466A63B 53/0412A63B 53/0408
50
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Claims

Abstract

A wood club head includes: a face portion; and a sole portion, wherein: a distance between a point of intersection where a perpendicular which passes through the position of the center of gravity of the club head intersects a horizontal line which passes through a leading edge in such a state that a sole of the club head sits flat properly and the leading edge, that is, a depth of the center of gravity VZG is defined as below: VZG<0.7159×(loft angle)+11.78; and VZG>face maximum height×tan(loft angle); a surface shape of the face portion is formed into a cylindrical curved surface having only a bulge radius; and a depth of the club head from the leading edge to back end is 60 mm or more.

Claims

exact text as granted — not AI-modified
1 . A wood club head comprising:
 a face portion; and   a sole portion, wherein:   a distance between a point of intersection where a perpendicular which passes through the position of the center of gravity of the club head intersects a horizontal line which passes through a leading edge of the face portion in such a state that the sole portion of the club head sits flat properly and the leading edge, that is, a depth of the center of gravity VZG is defined as below: VZG<0.7159×(loft angle)+11.78; and VZG>face maximum height×tan(loft angle);   a surface shape of the face portion is formed into a cylindrical curved surface having only a bulge radius; and   a width of the club head, which is horizontal distance of the leading edge to the back end, is 65 mm or more and 100 mm or less.

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