Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1980-06-18
1981-12-22
Little, Willis
Electricity: circuit makers and breakers
Liquid contact
Time delay
200 5A, 200292, 29622, H01H 900, H01H 1302
Patent
active
043072755
ABSTRACT:
A membrane switch construction and method for making same. A plate of relatively rigid, flat material is coated with an insulative cover and electrical conductors are formed thereon. A membrane of flexible, plastic material with conductors formed on the underside thereof overlies the plate. A non-conductive spacing means interposed between the conductors has holes in register with the conductors. The spacing means normally holds the conductors in spaced, non-contacting relation. The conductors are movable through the holes in the spacing means in response to pressure on the exterior of the membrane. One or the other or both of the sets of conductors may comprise two tiers of conductors separated by an isolation layer of non-conductive material. Holes are appropriately positioned in the isolation layer to permit access to the buried tier of conductors. Interconnect holes may also be provided in the spacing means to permit electrical connection between the conductors, thus forming a multi-layer conductive system.
REFERENCES:
patent: 3594684 (1971-07-01), Miller
patent: 4028509 (1977-07-01), Zurcher
patent: 4143253 (1979-03-01), Wagner et al.
Bierhuizen Philip
Larson Willis A.
Van Zeeland Anthony
Little Willis
Oak Industries Inc.
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