Push button mechanism with locking device for two stable positio

Details Push button mechanism with locking device for two stable positio Push button mechanism with locking device for two stable positio

1981-01-29

1983-01-04

Little, Willis

Electricity: circuit makers and breakers

Liquid contact

Time delay

33328, H01N 920

Patent

active

043673830

ABSTRACT:
A push-button mechanism, for example, for a telephone instrument of the type which from a first stable initial position of the push-button is locked in a second stable position when depressed and returns to the initial position when again depressed. The push-button mechanism contains a push-button, a rectangular body part and a cover which includes contact elements. A locking device inside the cover consists of a movably disposed plate one surface of which is constructed with a cavity in the form of a heart-shaped cam and with a concave-convex elevated part in the center of the cavity. A ball is located in a groove in the lower part of the push-button and runs along the outline of the heart-shaped cam and along the edges of the elevated part when the button is depressed.

REFERENCES:
patent: 3411376 (1968-11-01), Weber et al.
patent: 3629526 (1971-12-01), Lewis
patent: 4238653 (1980-12-01), Brandt

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