Electricity: circuit makers and breakers – Multiple circuit control – Multiple switch
Patent
1985-05-30
1986-07-22
Scott, J. R.
Electricity: circuit makers and breakers
Multiple circuit control
Multiple switch
200 86R, 200159B, H01H 1370
Patent
active
046021353
ABSTRACT:
The present invention is directed to an improved membrane switch of the kind comprising a polymeric overlay, which is generally planar and containing designated switch areas thereon for manual operation by pressure. The switch is formed from several layers of conductive and nonconductive materials. Specifically, the switch includes a pair of electronic switch circuit leads disposed in noncontacting proximity. A substantially planar circuit completing layer formed to correspond with the pair of switch circuit leads is formed from conductive material and disposed and spaced array substantially parallel to the switch circuit leads. A nonconductive spacer is disposed, in one preferred embodiment, between the electric circuit and the circuit completing layer, with the spacer having a plurality of apertures therein of a selected density sufficient to provide a selected touch pressure. In another preferred embodiment, the substantially planar circuit completing layer is omitted, and the pair of electronic switch circuit leads are instead disposed in separate planes and are separated by the spacer, such that manual pressure on the switch will contact one circuit lead with the other circuit lead through the apertures in the spacer.
REFERENCES:
patent: 3699294 (1972-10-01), Sudduth
patent: 4017697 (1977-04-01), Larson
patent: 4085302 (1978-04-01), Zenk et al.
patent: 4317013 (1982-02-01), Larson
patent: 4365130 (1982-12-01), Christensen
patent: 4385215 (1983-05-01), Lemberg
patent: 4471177 (1984-09-01), Doughty
patent: 4525606 (1985-06-01), Sudo
Scott J. R.
Ward Robert M.
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