Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1985-06-17
1986-10-21
Marcus, Stephen
Electricity: circuit makers and breakers
Liquid contact
Time delay
200335, H01H 1352
Patent
active
046187545
ABSTRACT:
A momentary membrane switch that includes not only a normally open set of electrical contacts but also a normally closed set of electrical contacts. In one embodiment, a downward force applied to the switch pivots an elongated, flat rocker, to close the normally open contacts and simultaneously open the normally closed contacts. Pivoting of the rocker is yieldably resisted by an overlaying resilient membrane, which forceably returns the rocker to its original position when the force is removed. In another embodiment, a downward force applied to the switch lowers the center of a special disk into contact with an underlying circuit board, to close the normally open contacts, and simultaneously deforms the disk's periphery upwardly, to open the normally closed contacts. Internal stress in the deformed disk returns the disk to its original position when the force is removed. The rocker and disk are both retained without any special attachment in a specially-sized aperture formed in a spacer located between the underlying circuit board and overlaying membrane.
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Luebke Renee S.
Marcus Stephen
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