Keytop levelling mechanism

Details Keytop levelling mechanism Keytop levelling mechanism

1983-02-22

1984-02-21

Shepperd, John W.

Electricity: circuit makers and breakers

Electric switch details

Actuators

H01H 312

Patent

active

044332254

ABSTRACT:
A keytop levelling mechanism for use in conjunction with a keytop having a main portion and a stem portion cantilevered from the main portion, e.g., an L-shaped keytop. When pressed, the keytop actuates a keyswitch mounted on a circuit board. The levelling mechanism comprises a pair of lever arms joined at intermediate portions thereof by a pivot to form a scissors-like linkage. The scissors-like linkage is mounted between the stem portion of the keytop and the circuit board in a manner such that it collapses in scissor-like fashion when the keytop is pressed toward the circuit board. In this manner, the scissor-like linkage maintains the keytop level throughout its movement toward and away from the circuit board.

REFERENCES:
patent: 3144270 (1964-08-01), Bilancia
patent: 3741512 (1973-06-01), Olsson
patent: 3916150 (1975-10-01), Abernethy et al.
patent: 3940578 (1976-02-01), Pointon
patent: 4392037 (1983-07-01), Fleming

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