Screening And Cleaning Patents (Class 84/64)
  • Valve device especially for pneumatically operated player pianos and organs
    Patent number: 3990340
    Abstract: A valve device, especially for pneumatically operated pianos and organs, in which the valve device is interposed between a source of suction and pneumatic actuators for the keys of the instrument and under the control of a perforated paper strip. The valve of the present invention is particularly characterized in being readily disassembled for adjustment and service and replacement of parts if necessary.
    Type: Grant
    Filed: June 4, 1975
    Date of Patent: November 9, 1976
    Assignee: Kimball International, Inc.
    Inventors: Richard R. Mills, Richard Hebeisen