Patent ID: 7915509

Claim:
In a keyboard instrument having a case, a balance rail mounted within said case, a plurality of pivot pins vertically disposed along said rail, and a plurality of key levers each having a slot for receiving one of said pivot pins, said key levers disposed over said pivot pins through said slots, the improvement which comprises: A. a plurality of movable pivot bearings providing fulcrum points for said levers, each having a longitudinal port for receiving one of said pivot pins, each longitudinally slideably disposed over one of said pivot pins between one of said key levers and said balance rail, wherein the position of each of said pivot bearings is longitudinally adjustable in relation to one of said keys, one of said pivot pins, and said balance rail; and B. pivot bearing adjustment means mounted within said case and attached to said pivot bearings for longitudinally sliding said pivot bearings between said balance rail and said key levers to alter the fulcrum points of said key levers.