Grand piano action
OwnerGary M. Levinsoninventor
Life of this patent
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Abstract
Within each action of a grand piano there are certain wood surfaces which rub against other surfaces. These interfaces create friction, which adversely affects the playability of the piano. In order to reduce and overcome this friction, strips of fluorocarbon resin, having an extremely low coefficient of friction, are adhered to those wooden surfaces within the action which come into contact with other surfaces.
Claims24
A method of making a reduced friction action for a grand piano of the type which includes a repetition lever, key means for actuating said repetition lever and a knuckle, said method comprising the step of adhering a strip of film of a low friction polymeric material to that surface of said repetition lever which comes into contact with a surface at the knuckle when a key of said grand piano is struck to lower the friction between said surface and said repetition lever, to increase the responsiveness of the action, and to improve the longevity of the action.
A method of making a reduced friction action for a grand piano of the type which includes a jack, key means for actuating said jack and a knuckle, said method comprising adhering a strip of film of a low friction polymeric material to those surfaces of said jack which come into contact with the surface of the knuckle when a key of said grand piano is struck to lower the friction between said knuckle and said jack, to increase the responsiveness of said action and to improve the longevity of said action.
A method of making a reduced friction action for a grand piano of the type which includes a jack;
- a repetition lever, key means for actuating said jack and repetition lever, and a knuckle, said method comprising the steps of adhering strips of film of a low friction polymeric material to those surfaces of the jack and repetition lever which come into contact with the surface of the knuckle when a key of said grand piano is struck to lower the friction between the knuckle, and the jack and repetition lever, to increase the responsiveness of said action and to improve the longevity of said action.
In a reduced friction action for a grand piano of the type which includes a jack, a repetition lever, key means for actuating said jack and lever, a hammer, a tender, a let off regulating screw, and a knuckle, said key means comprising a plurality of keys, the improvement comprising a strip of film of a low friction polymeric material disposed on the surface of the jack which comes into contact with a surface on the knuckle when one of said keys of said grand piano is struck to lower the friction between said jack and said knuckle, to increase the responsiveness of said action and to improve the longevity of said action.
Dependencies are inferred from the claim text.