Inverted Jack Patents (Class 84/248)
  • Piano action with articulated jack
    Patent number: 6232537
    Abstract: A piano keyboard apparatus has an action assembly that includes a four bar linkage having four pivotably connected bars including a whippen pivotably connected to a repetition lever. An articulated jack has a lower link pivotably connected to an upper link and the lower link is pivotably connected to the whippen.
    Type: Grant
    Filed: June 1, 2000
    Date of Patent: May 15, 2001
    Assignee: Baldwin Piano & Organ Company
    Inventor: Thomas E. Kimble