Constant load snap switch with manual or automatic reset, stop a

Details Constant load snap switch with manual or automatic reset, stop a Constant load snap switch with manual or automatic reset, stop a

1982-12-27

1985-05-28

Marcus, Stephen

Electricity: circuit makers and breakers

Special application

Liquid or moisture responsive

200 67E, 335176, H01H 522

Patent

active

045202443

ABSTRACT:
A constant load and constant contact force snap-action switch having a normally-closed movable operate contact on a flipper blade which has a compression strip that snaps through an S-curvature to a reverse buckled state to trip the operate contact open. The flipper blade is coupled through an insulating cap to the leaf spring mounted movable alarm contact to close the latter at the same time. A return spring biased reset lever resets the operate contacts on depression down a first amount, opens the operate contact without closing the alarm contacts on depression down a second amount for stop purposes, and trips the operate contacts open on lifting upwards for test purposes. On reset, lost motion in the coupling cap knocks the alarm contact open if welded. A selector is settable to select any of three functions for the reset lever, (1) reset-stop-test, (2) auto reset stop, or (3) reset test.

REFERENCES:
patent: 2236680 (1941-04-01), Fry
patent: 2693520 (1954-11-01), Bruno
patent: 2708371 (1955-05-01), Pashby
patent: 2767270 (1956-10-01), Perkins
patent: 2971069 (1961-02-01), Good
patent: 3243548 (1966-03-01), Kjellman et al.
patent: 3383235 (1974-09-01), Hoshioka
patent: 3828151 (1974-08-01), Brunnell et al.
patent: 4211907 (1980-07-01), Troebel
patent: 4286132 (1981-08-01), Greenwald
patent: 4295017 (1981-10-01), Kashima et al.

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