Key device for electronic keyboard musical instrument

Details Key device for electronic keyboard musical instrument Key device for electronic keyboard musical instrument

1988-10-11

1990-01-02

Hix, L. T.

Music

Instruments

General features

G10C 312

Patent

active

048905330

ABSTRACT:
An improved key device for an electronic keyboard musical instrument of the type having a fulcrum and a chassis each mounted on a support, and having a key pivotably mounted on the fulcrum, is further provided with a rotor rotatably coupled to the chassis. A first end of the rotor is in contact with an after-fulcrum rear end of the key. A key-returning spring is arranged to couple the rotor and the chassis. A rotation shaft member is fastened to the chassis, the rotor having a recessed portion for receiving the rotation shaft member whereby the rotor is rotatable relative to the rotation shaft member. A heavy mass portion is fastened to a second end of the rotor, the first and second ends of the rotor being on opposite sides of a rotational center of the rotation shaft member. A stopper is mounted on the chassis for suppressing vibrations of the rotor generated when the key is depressed.

REFERENCES:
patent: 4217803 (1980-08-01), Dodds
patent: 4375179 (1983-03-01), Schwartz et al.
patent: 4667563 (1987-05-01), Wakuda et al.

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