Electromagnetic actuator used for keyboard musical instrument

Details Electromagnetic actuator used for keyboard musical instrument Electromagnetic actuator used for keyboard musical instrument

1994-10-04

1996-04-09

Dougherty, Thomas M.

Music

Instruments

Automatic

84107, G10F 102

Patent

active

055063691

ABSTRACT:
An electromagnetic actuator unit is provided over a keyboard of a piano, and each of the electromagnetic actuators of the electromagnetic actuator unit has a solenoid coil wound on a bobbin and a plunger for pushing down one of the keys, wherein the gravity exerted on the plunger is smaller than a recovery force of the key or a return spring coupled to the plunger is provided outside of the bobbin for smoothly moving the plunger without influences of the magnetic field produced by the solenoid coil.

REFERENCES:
patent: 893710 (1908-07-01), Crippen
patent: 1504531 (1924-08-01), Thomson et al.
patent: 4206677 (1980-06-01), Ramsey
patent: 4216694 (1980-08-01), Ramsey et al.
patent: 4338847 (1982-07-01), Brennan
patent: 4513652 (1985-04-01), Muramatsu et al.
patent: 4843936 (1989-07-01), Murakami et al.

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