Keyboard having sudden trip tactile effect keys

Details Keyboard having sudden trip tactile effect keys Keyboard having sudden trip tactile effect keys

1979-11-20

1981-08-25

Shepperd, John W.

Electricity: circuit makers and breakers

Liquid contact

Time delay

200 67R, H01H 2140, H01H 1322

Patent

active

042861292

ABSTRACT:
The invention relates to a keyboard having sudden trip tactile effect keys.
Such a keyboard comprises a flexible and conducting foil stamped with protuberances, each of them having a central upper flat part, with an area less than the area of the base of the protuberance, and a lateral part, connecting the central part to the base of the protuberance, and comprising or not substantially flat counter-shapes, which is deformed and touches a contact zone of a printed circuit placed therebelow, when a pressure is exerted on the central part.
These keyboards find applications in remote-control boxes or else in pocket calculating machines.

REFERENCES:
patent: 3728509 (1973-04-01), Shimojo
patent: 3898421 (1975-08-01), Suzumura
patent: 3908109 (1975-09-01), Studebaker
patent: 3932722 (1976-01-01), Obata et al.
patent: 4190748 (1980-02-01), Langford
patent: 4195210 (1980-03-01), Punds et al.

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