Keyboard switch

Details Keyboard switch Keyboard switch

1985-12-30

1987-03-24

Scott, J. R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200159B, 200292, H01H 106, H01H 1370

Patent

active

046527044

ABSTRACT:
An improved multiple circuit keypad switch of the type in which a rigid key having a shorting puck on its underside is supported over exposed traces of a printed circuit card by a flexible membrane so that the puck shorts designated exposed traces to close all circuits when the key is depressed, the improvement arising from the layout of the exposed traces in which individual circuits are arranged in concentric rings and the shorting puck contains shorting elements arranged in corresponding concentric rings.

REFERENCES:
patent: 4156802 (1979-05-01), Gilano et al.
patent: 4246452 (1981-01-01), Chandler
patent: 4287394 (1981-09-01), Hargita et al.
patent: 4297542 (1981-10-01), Shumway
patent: 4409450 (1983-10-01), Blades
patent: 4423294 (1983-12-01), Walser et al.
patent: 4472609 (1984-09-01), Lamm et al.

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