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Action of grand piano

  • US 10,446,121 B1
  • Filed: 03/27/2019
  • Issued: 10/15/2019
  • Est. Priority Date: 03/28/2018
  • Status: Active Grant
First Claim
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1. An action of a grand piano, which operates in accordance with depression of a key to thereby cause pivotal motion of a hammer, including:

  • a wippen formed by a molded article of a synthetic resin and configured to pivotally move upward by being pushed up by the key subjected to key depression;

    a jack pivotally mounted to the wippen and configured to push up the hammer in accordance with pivotal motion of the wippen to cause the hammer to pivotally move upward; and

    a jack angular position-adjusting mechanism provided on the wippen so as to adjust an angular position of the jack,wherein the jack angular position-adjusting mechanism comprises;

    a support portion integrally formed with the wippen;

    an adjustment screw extending a predetermined length in a front-rear direction and screwed into the support portion such that the adjustment screw is movable forward and backward in the front-rear direction; and

    an abutment portion provided on a jack-side end of the adjustment screw, for defining the angular position of the jack by abutment with the jack.

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