Grands Patents (Class 84/26)
Connections to piano action (Class 84/27)
  • Compact device for adjusting piano key touch weight
    Patent number: 7847173
    Abstract: A series of adjustable springs, rigidly suspended above the keys of a piano, provides a downward force which reduces the effort needed to depress the keys. Precise adjustment of the series, and its attachment to the piano are facilitated through the use of existing fastener hardware within the conventional piano architecture.
    Type: Grant
    Filed: May 18, 2009
    Date of Patent: December 7, 2010
    Assignee: Pitchlock Inc.
    Inventor: Marvin Scott Jones