Keyboard switch

Details Keyboard switch Keyboard switch

1981-11-23

1983-11-29

Shepperd, John W.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200346, H01H 312, H01H 1352

Patent

active

044182570

ABSTRACT:
An improved switch assembly is disclosed having particular application as part of a key in a computer keyboard. The switch includes first and second pairs of spaced apart electrical contacts, the first pair extending above the second. A conductive and resilient diaphragm is disposed over both pairs of contacts physically contacting only the first. A deformable generally bell shaped actuator member is disposed over the diaphragm, the walls of the actuator member being tapered in thickness so as to buckle upon the application of a known vertical force. Actuator means are provided to deform the actuator member in response to the activation of the switch by a user, thereby forcing the diaphragm to physically contact the second electrical contact completing a circuit.

REFERENCES:
patent: 3780237 (1973-12-01), Seeger et al.
patent: 3879593 (1975-04-01), Larson
patent: 3932722 (1976-01-01), Obata et al.
patent: 3973091 (1976-08-01), Kaminski
patent: 4129758 (1978-12-01), Gilano et al.
patent: 4163125 (1979-07-01), Boulanger
patent: 4180711 (1979-12-01), Hirata et al.

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