Pneumatic piano action

Details Pneumatic piano action Pneumatic piano action

1977-08-25

1979-05-08

Franklin, Lawrence R.

Music

Instruments

Stringed

84237, 84240, 84440, G10C 316

Patent

active

041529677

ABSTRACT:
An action for a piano type musical instrument in which the hammer striking force is produced by the reaction of a pneumatic piston. For the grand piano embodiment, the hammer pivot is carried by the key-lever and the piston is connected to the hammer butt such that when the instrument is played the resistance of the piston raises the hammer into the musical string. A similar action is shown for the upright piano. In each case the hammer is propelled into the string with a velocity proportional to key-lever velocity and the escape, check and repetition parts of conventional actions are made unnecessary by the inherent properties of the pneumatic piston.

REFERENCES:
patent: 1148719 (1915-08-01), Sandell
patent: 1680039 (1928-08-01), Hammond

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