Patent ID: 7572193
Filing Date: 2009-08-11
Classification: A63B

Abstract:
1. A golf club head comprising: a face portion having a front face forming a club face and a rear face facing a hollow; a sole portion extending backward from the face portion and having an inner surface facing the hollow and an outer surface forming an undersurface of the head, the sole portion provided with a tubular part having a hole that forms a socket; and a weight member secured in the socket, wherein the tubular part protrudes from the inner surface of the sole portion into the hollow, the sole portion is provided on the outer surface with at least one stiffening groove so that said at least one stiffening groove forms at least one stiffening rib on the inner surface of the sole portion, and the stiffening groove is partially included in a vicinity zone which is defined as extending 10 mm from the socket, wherein said at least one stiffening groove is a toe-side groove and a heel-side groove each not connected to the socket, the heel-side groove extends towards a heel side from a starting point within the vicinity zone while curving towards a club face side, and the toe-side groove extends towards a toe side from a starting point within the vicinity zone while curving towards a club face side.