Golf clubhead

• US 20030064823A1
• Filed: 09/19/2002
• Published: 04/03/2003
• Est. Priority Date: 09/28/2001
• Status: Active Grant

• Current Assignee: SRI Sports Limited (Sumitomo Rubber Industries Limited)
• Original Assignee: SRI Sports Limited (Sumitomo Rubber Industries Limited)
• Inventors: Yamamoto, Akio
• Granted Patent: US 7,018,303 B2
• Time in Patent Office: Days
• US Class Current: 473/329
• CPC Class Codes: A63B 53/04 Heads
• CPC Class Codes: A63B 53/0408 characterised by specific dimensions, e.g. thickness
• CPC Class Codes: A63B 53/045 Strengthening ribs
• CPC Class Codes: A63B 53/0458 with non-uniform thickness of the impact face plate
• CPC Class Codes: A63B 53/0466 wood-type
• CPC Class Codes: A63B 53/047 iron-type
• CPC Class Codes: A63B 60/00 Details or accessories of golf clubs, bats, rackets or the like
• CPC Class Codes: A63B 60/52 with slits

Abstract

A golf clubhead comprises a face portion having a back surface which is provided around a center region with at least two annular grooves so that the face portion is provided with at least two annular thin parts each being thinner than the center region and at least one rib part between the thin parts, whereby the rebound performance and durability of the face portion can be improved.

Claims

1. A golf clubhead comprising a face portion having a back surface, said back surface provided around a center region thereof with at least two annular grooves so that said face portion is provided with at least two annular thin parts each being thinner than the center region and at least one rib part between the thin parts.

2. A golf clubhead according to claim 1, wherein

said face portion is further provided with a rib part around the annular thin part which is outermost in said at least two annular thin parts.

3. A golf clubhead according to claim 1, wherein

said center region has a oval shape having the center at a clubface center,

a minor axis of at least 10 mm extending in a crown-sole direction, and

a major axis of at least 20 mm extending in a toe-heel direction.

4. A golf clubhead according to claim 1, wherein

in said at least two annular thin parts, each thin part is thinner than the thin part inwardly adjacent thereto.

5. A golf clubhead according to claim 1, wherein

the thickness of the face portion changes smoothly in between at least two annular thin parts and at least one rib part.