Limit switch

Details Limit switch Limit switch

1980-03-06

1981-10-13

Shepperd, John W.

Electricity: circuit makers and breakers

Limit switch

200153T, 200153V, 200330, 200340, H01H 316

Patent

active

042950171

ABSTRACT:
A limit switch wherein a first spring means for actuating a push-button of selfcontained micro-switch and a second spring means only which engages an operating means for absorbing an over-travelling stroke of the operating means which receives an external operating force are both disposed inside a limit switch housing. In normal non-actuating position, respective biasing forces of the both spring means are balanced so that the second spring means restrains the first spring means from engaging the push-button but, upon application of the operating force through the operating means to the second spring means, the restraint of the first spring means is released due to a resilient bowing of the second spring means so as to have the push-button actuated by the biasing force of the first spring means, and the second spring means continues to further bow for absorbing the over-travelling.

REFERENCES:
patent: 2236680 (1941-04-01), Fry
patent: 2431747 (1947-12-01), Fry
patent: 2454341 (1948-11-01), Repka
patent: 3390242 (1968-06-01), Koepko
patent: 3427420 (1969-02-01), Geremia et al.

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