Patent ID: 7129403

Claim:
A grand piano action comprising a flange carrying a hammer shank carrying a piano hammer and a knuckle; a jack being carried by a wippen lever; a capstan screw on the piano key supporting said wippen lever; an arm of said jack opposing an escapement let off button; a vertically oriented portion of said wippen lever carrying a double ended spring; said wippen lever carrying a regulating screw, the first end of said spring supporting a repetition lever, the second end of said spring being in a hole along said regulating screw; the top of said jack having a projection, said projection acting against said knuckle by a counter weight carried by said jack; said capstan screw on said piano key being positioned on said piano key at a selected distance from the distal end of said wippen lever for a selected amount of friction between said jack and said knuckle; the lesser said distance the lesser said friction between said jack and said knuckle the greater said distance the greater said friction between said jack and said knuckle; said capstan screw positioned on said piano key under said distal end of said wippen lever eliminating completely said friction between said jack and said knuckle.