Continuous Patents (Class 84/252)
  • Patent number: 7550659
    Abstract: A keyboard apparatus includes: a plurality of keys; a plurality of hammers; a first supporting portion; a second supporting portion; an interlocking mechanism. The interlocking mechanism conveys weight of the hammers respectively to rear portions of the keys, and causes an upward movement of the hammers, when front portions of the keys are depressed and the rear portions of the keys are swung upward. The interlocking mechanism is configured so as to maintain correspondence relations between depression speeds of the keys and moving speeds of the hammers within a range of inclinedable angles in which the keys are swingable when the front portions of the keys are depressed.
    Type: Grant
    Filed: June 26, 2007
    Date of Patent: June 23, 2009
    Assignee: Kabushiki Kaisha Kawai Gakki Seisakusho
    Inventor: Yoshiaki Shimoda