Electrical key contact

Details Electrical key contact Electrical key contact

1981-06-04

1983-12-13

Shepperd, John W.

Electricity: circuit makers and breakers

Electric switch details

Actuators

200 5A, 200308, 235145R, H01H 918, H01H 1314

Patent

active

044206666

ABSTRACT:
A key contact set includes a plurality of electrical key contacts having key buttons, and includes a cover plate with a plurality of key openings through which the respective key buttons project. The key openings and the key buttons each have the shape of a segment of a circle, an ellipse, or a similarly shaped figure. The marking associated with each key is provided on the cover plate in the complementary segment of the circle, ellipse, or other figure. The portion of the cover plate surrounding each key is preferably bent forwardly or rearwardly from the main plane of the cover plate to define a curved surface, and each key button preferably is provided with a service surface having substantially the same radius of curvature as the bent portion of the cover plate.

REFERENCES:
patent: 1337217 (1920-04-01), Gillingham
patent: 2459862 (1949-01-01), Avery
patent: 4024368 (1977-05-01), Shattuck
patent: 4128889 (1978-12-01), Ojma et al.
patent: 4184321 (1980-01-01), Tarusawa
patent: 4292510 (1981-09-01), Hild

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