Key switch mechanism and membrane actuator

Details Key switch mechanism and membrane actuator Key switch mechanism and membrane actuator

1989-04-28

1990-06-05

Recla, Henry J.

Electricity: circuit makers and breakers

Solid contact

Membrane type

200408, 200521, 200341, H01H 110

Patent

active

049316060

ABSTRACT:
A switch activator is described which is a unitary molded plastic molded coil spring and a pivot plate which pivots to act on a membrane switch when the coil spring buckles under load. The buckling of the spring is controlled by the relative placement of the axis of the spring and a pivot surface around which the top portion of the spring pivots as the spring buckles. The cross section of the spring member is limited in size so as to prevent the forming of a solid column upon compression, while at the same time accommodating the needs for molten plastic flow in the spring during molding.

REFERENCES:
patent: 4118611 (1978-10-01), Harris
patent: 4479040 (1984-10-01), Denley et al.
patent: 4528431 (1985-07-01), Coleman, III
patent: 4553009 (1985-11-01), Van Zeeland et al.
patent: 4859820 (1989-08-01), Gotfryd et al.

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