Abstract: A racket string clamp including a plurality of wedges for being inserted into a hole extended through a game ball racket frame and for being wedged between the end portion of a game ball string and the surface of the racket frame defining the hole to secure the end portion of the string to the racket frame, and further including handle means including a plurality of handle members equal in number to the wedges and formed integrally therewith and for maintaining the wedges in a predetermined relationship with respect to each other, the wedges and handle means having inner surfaces providing in combination a passageway for receiving the string, the rearward portions of the handle members being formed integrally to provide a pivot about which the handle members and wedges pivot away from and toward each other in tweezer-like action, upon the handle members and wedges pivoting away from each other, the string is provided access to the passageway and upon the string being received within the passageway the handle

Abstract: Clamping apparatus extending through a passageway formed in the frame of a game ball racket for applying non-uniform clamping pressure to a length of a game ball string adjacent an end thereof to clamp the length of string to the game ball racket frame, the non-uniform clamping pressure is minimum at the forward or pulled end of the clamped length of string where the tensile stress produced in the clamped length of string due to stringing and play is maximum and which non-uniform clamping pressure increases to a maximum at the free or rearward end of the clamped length of string where the tensile stress therein is minimum; the tendency of the clamped length of string to rupture at the forward or pulled end of the clamped length of string where the tensile stress is maximum is reduced because the non-uniform clamping pressure applied by the clamping apparatus of the present invention is minimum at this critical point.

Abstract: Metal support apparatus including a plurality of structurally interrelated metal members with each metal member being of a predetermined configuration. Also disclosed is a metal (e.g. aluminum) platform tennis court including a plurality of such above-mentioned metal support apparatus on the deck or playing surface of the court, such metal deck or playing surface providing, over the entire area thereof, a more uniform deflection in response to the weight or force of a running player than a wooden playing surface or deck of a wooden platform tennis court.