Patent ID: 6695712
Filing Date: 2004-02-24
Classification: A63B

Abstract:
A golf club set comprising a plurality of golf clubs having different identification numbers, whereineach of said plurality of golf clubs has a golf club head and a shaft connected to said golf club head; each of sail golf club heads has an ellipsoid of inertia with its center at a center of gravity; when said ellipsoid of inertia is virtually cut with a plane passing through the center of gravity of said golf club head and being parallel to a face surface, a major axis of a plane ellipse appearing on its cut surface forms an angle of &thgr; with an intersecting line of said cut surface and a ground surface; the major axis of said plane ellipse extends upward and away from the ground surface as it approaches a toe part; said angle &thgr; is not smaller than 0.5Â° and not larger than 9.5Â°; an aspect ratio a/b defined by a ratio &agr; length &agr; of the major axis to length b of a minor axis of said plane ellipse is not smaller than 1 and not larger than 4; said angle &thgr; of each of the plurality of golf club heads increases successively with an approximately constant ratio according as the identification number of said golf club increases; and said aspect ratio a/b of said plurality of golf club heads decreases successively or remains approximately equal according as said identification number increases.