Keyboard switch

Details Keyboard switch Keyboard switch

1982-09-30

1984-11-27

Scott, J. R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200159B, 200306, H01H 1370

Patent

active

044852797

ABSTRACT:
A keyboard switch includes upper and lower substrates spaced from each other by a spacer having a plurality of spaces in which upper and lower contacts respectively on the upper and lower substrates are placed, respectively. An insulating sheet is sandwiched between the lower substrate and a base plate and has a plurality of slits aligned respectively in vent holes in the base plate and the lower substrate for preventing substantial passage therethrough of dirt or dust while allowing air to flow therethrough.

REFERENCES:
patent: 3898421 (1975-08-01), Suzumura
patent: 4046975 (1977-09-01), Seeger, Jr.
patent: 4249044 (1981-02-01), Larson
patent: 4365130 (1982-12-01), Christensen
patent: 4400595 (1983-08-01), Ahumada

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