Keyboard spring return mechanism

Details Keyboard spring return mechanism Keyboard spring return mechanism

1980-03-24

1982-12-21

Hix, L. T.

Music

Instruments

General features

84433, G10C 312

Patent

active

043642977

ABSTRACT:
A keyboard mechanism for musical instruments which includes a key return spring made from resilient wire bent to form a pair of flexure spring arms connected by a bight. The arms have elbow bends. The ends of the arms have wrist bends, and are trapped in apertures formed in the frame of the instrument. The bight is trapped in one of a plurality of notches on the outer surface of the key. The spring is located close to the fulcrum of the key, in order to reduce the moment arm and spring deflection, both of which contribute to undesirable force build-up.

REFERENCES:
patent: 2913949 (1959-11-01), Lidblom
patent: 3026760 (1962-03-01), Fauser
patent: 3175451 (1965-03-01), Klann
patent: 3306152 (1967-02-01), Klann
patent: 3330176 (1967-07-01), Schwartz et al.
patent: 3413885 (1968-12-01), van der Lely
patent: 3447414 (1969-06-01), Lo Duca
patent: 3657459 (1972-04-01), Peterson
patent: 3935784 (1976-02-01), Koepke
patent: 4068552 (1978-01-01), Allen
patent: 4128035 (1978-12-01), Erickson et al.

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