Patent ID: 8992339
Filing Date: 2015-03-31
Classification: A63B

Abstract:
1. A golf club head having a face for hitting a golf ball, a shaft-inserting hole to attach a shaft and a hollow interior, said golf club head comprising a hollow head body and a gravity center adjuster fixed to said hollow head body, said gravity center adjuster comprising a first weight member and a second weight member having a lower specific gravity than said first weight member, said first and second weight members being provided in said hollow head body so that the locations thereof are interchangeable with each other, whereby a depth of the center of gravity which is a distance from the center of gravity of said head to a sweet spot of said face can be changed without substantially changing a distance of the center of gravity which is the shortest distance from an axial center line of said shaft-inserting hole to the center of gravity of said head, wherein the center of gravity of said first weight member is movable substantially on the circumference of a circle having a center that is an axial center line of said shaft-inserting hole by the interchangeable locations of said first and second weight members.