Abstract: A golf club has a shaft with a proximal end and a distal end. A golf club head is attached to the distal end of the shaft. The head has a leading ball-striking face, and a trailing edge with a striking axis defined generally perpendicular to the striking face and a transverse axis defined generally parallel to the striking face. The head includes a polymer insert having a transversely extending face portion and a generally cylindrical portion extending rearwardly therefrom along the striking axis. The face portion has a transverse width greater than the generally cylindrical portion. A metal shell has a body portion surrounding the cylindrical portion and a perimeter ridge extending around the perimeter of the face portion of the polymer insert such that the perimeter ridge of the metal shell and a face portion of the polymer insert cooperate to define the ball-striking face of the golf club head.

Abstract: A lightweight, convenient training device includes a rigid, elongated member having first and second ends, and a clamping mechanism used to adjustably then rigidly secure the member at its first end to a golf club, including a putter, preferably to the shaft at a point just below the hand grip. So positioned, the second end of the member may then be comfortably positioned in the user's armpit to stabilize the swing, with the adjustability of the clamping mechanism ensuring compliance with various grip styles and lie angles. In the preferred embodiment, the elongated member includes a bend near the first end to prevent contact with the user's hands, and the clamping mechanism includes means for adjusting the elongated member along two degrees of freedom with respect to the golf club shaft.

Abstract: A golf swing trainer includes a sensor responsive to axial forces and a sensor responsive to lateral forces disposed in electrical communication with an alarm circuit. The training device is responsive to velocity and attitude of the golf club and is operative to provide a user-detectable signal if an improper swing is executed. An alarm is actuated when a predetermined lateral force is exceeded and a predetermined axial force is not exceeded.

Abstract: A system for stacking metal sheets onto a pallet positioned on a conveyor oriented in a complex angle. Positioning of side gates and stops defining the stacking area is accomplished automatically so that the system may be easily adapted to sheets of different sizes.