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Friction at the jack and knuckle interface in a grand piano eliminated

  • US 20050284279A1
  • Filed: 06/29/2004
  • Published: 12/29/2005
  • Est. Priority Date: 06/29/2004
  • Status: Active Grant
First Claim
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1. 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 buttons 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 said 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.

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