Golf clubs

Abstract

Golf clubs, of putter and wood-type especially, each include an attachment between shaft and club head which is of a compliance to allow the club head to behave more closely as a ‘free-body’ in providing vertical gear-effect when striking the ball. The compliance is related to freeing the club head for rotation about an axis 35 which extends through the center of mass 31 with an orientation perpendicular to the shaft axis 37 in a plane parallel to the shaft axis 37 and containing the heel-toe axis 34 through the center of mass 31. In this regard, the compliance about axis 35 is not less than the force-couple bending compliance of a length of 1000/K, or 3000/K, or more preferably 10000/K, millimetres of the shaft measured from the tip-end. The rotational axis 35 is spaced by less than 0.33 K millimetres, or not more than 4,25 or less than 2 millimetres, from the shaft axis 37. The center of mass 31 is located not less than 10 millimetres, and preferably not less than 15 millimetres, behind the impact face, and is not more than 13 millimetres, and preferably not more than 10 millimetres, above the sole of the club. The spacing DD between the shaft-attachment 38 and the rotational axis 35 is less than 2 K millimetres or preferably less than K millimetres.

Dependencies are inferred from the claim text.