Keyboard switch assembly with multiple isolated electrical engag

Details Keyboard switch assembly with multiple isolated electrical engag Keyboard switch assembly with multiple isolated electrical engag

1977-06-10

1979-08-14

Scott, James R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200 86R, 200159B, 200275, H01H 1370

Patent

active

041646347

ABSTRACT:
A switch assembly includes an array of switches arranged on a substrate having a conductive pattern on a surface thereof defining a plurality of switch contacts. An apertured spacer is disposed adjacent the surface with an aperture being positioned in opposed relationship to each switch contact. A multi-conductive contact material is disposed to provide switch closure when forced through an aperture in the separator into engagement with a switch contact at a large number of separate conductive engagement regions. In one arrangement the multi-conductive contact material is a fine mesh woven wire screen stretched taut adjacent the separator while in another arrangement it is a uniaxially conducting material having a high density of parallel, spaced conductors extending perpendicular to the surface.

REFERENCES:
patent: RE28365 (1975-03-01), Brave
patent: 1775755 (1930-09-01), Forman
patent: 1776992 (1930-09-01), Brockman
patent: 3056005 (1962-09-01), Larson
patent: 3165606 (1965-01-01), Cooper
patent: 3396252 (1968-08-01), Serizawa et al.
patent: 3699294 (1972-10-01), Sudduth
patent: 3723673 (1973-03-01), Clary et al.
patent: 3745287 (1973-07-01), Walker
patent: 3830991 (1974-08-01), Du Rocher
patent: 3860771 (1975-01-01), Lynn et al.
patent: 4090045 (1978-05-01), Marsh

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