Abstract: A golf club comprising an elongated shaft with a lower end for attachment of the club head. The club head comprises a hosel portion for connection of the head to the shaft end, and a main body portion which comprises an enclosed outer wall and a hollow interior chamber. The club further involves the presence of molded material which fills the hollow chamber of the head, this molded material comprising a flexible synthetic plastic foam which bonds to the inner wall surfaces. The manufacturing method involves the filling of the chamber with the foam whereby the foam forms within the chamber. This method may involve the mixing of an aromatic isocyanate with a polyether polyol prior to introduction of the mixture into the chamber. The mixture, which forms a flexible polyurethane foam with the desired bonding characteristics, may be introduced through an axial bore defined by the hosel which opens into the interior of the chamber. The method is preferably applied to the manufacture of metal club heads.

Abstract: A fitting golf club for determining the flexibility of a golf club shaft, the club including an elongated shaft having one shaft end portion adapted to be grasped in a person's hands and an opposite shaft end portion with a golf club head attached. An indicia bearing screw head is adjustable between a plurality of different positions. Mechanisms associated with the adjustable head are operative responsive to the centrifugal force applied upon swinging of the fitting golf club. The mechanisms include a weight pivotally mounted within the head on an axis perpendicular to the shaft and parallel with the swing direction, the weight being movable between an armed position adjacent the upper side of said head to a released position adjacent the lower side of said head. The optimum shaft flexibility for the person being tested is determined by the position of adjustment of the adjustable head when compared with the time of release of the weight.