Patent ID: 7988565
Filing Date: 2011-08-02
Classification: A63B

Abstract:
1. A hollow golf club head comprising: a sole part, wherein the sole part has a first groove forming part and a second groove forming part which have a recessed outer surface and a protruding inner surface; the first groove forming part and the second groove forming part have a front-back directional length; and a distance between the first groove forming part and the second groove forming part in a toe-heel direction increases in a direction toward a back of the head; the sole part further comprising: a plurality of sets of the first groove forming part and the second groove forming part, wherein the sole part is absent of any other groove forming parts between the first groove forming part and the second groove forming part of a first set of the plurality of sets, and wherein the sole part is absent of any other groove forming parts between the first groove forming part and the second groove forming part of a second set of the plurality of sets.