Multiple key with invisible hinge

Details Multiple key with invisible hinge Multiple key with invisible hinge

1984-03-05

1985-11-19

Marcus, Stephen

Electricity: circuit makers and breakers

Liquid contact

Time delay

200 5A, 200340, H01H 312

Patent

active

045544263

ABSTRACT:
A printed circuit keyboard of the type comprising a face plate (10) having apertures through which keys (11) project, a resilient silicone rubber pad (12) having convex dimples (15) which engage the bases (14) of the keys, and a printed circuit board (13) having key pad contacts (16) which are bridged by the electrically conductive concave inner surface of a corresponding dimple when a key is depressed is improved by joining two or more keys together with a common base. When one key is depressed the others act as a hinge. This improves key pad contact since the hinge action causes the key to always come down the same way. This also improves the key "feel" since the hinge action will not allow the key to wobble on its descent. Embodiments of two, three and four keys joined with a common base are disclosed.

REFERENCES:
patent: 3691324 (1972-09-01), Brantingson
patent: 3800104 (1974-03-01), Lien et al.
patent: 4029916 (1977-06-01), Chu
patent: 4190748 (1980-02-01), Langford
patent: 4256931 (1981-03-01), Palisek

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