Interlock means for switch enclosure

Details Interlock means for switch enclosure Interlock means for switch enclosure

1976-12-02

1978-10-03

Schaefer, Robert K.

Electricity: circuit makers and breakers

Interlocking

Between plural switches

H01H 922

Patent

active

041186079

ABSTRACT:
An electric switch mounted within an enclosure having a hinged cover is manually operated from outside the enclosure by a handle mechanism secured to the enclosure. The cover is provided with a single aperture near the edge thereof remote from the cover hinges, with this aperture providing clearance for the U-shaped operating handle of the mechanism when the cover is closed and also providing clearance for a catch which holds the cover closed. The mechanism also includes a defeatable cover interlock to prevent opening of the cover when the switch is closed, and a defeatable switch interlock to prevent closing of the switch when the cover is open. Each interlock comprises a flat member biased to an active position by a U-shaped wire spring, positioned for cooperation with different arms of the operating handle, and mounted for movement in planes perpendicular to the cover when the latter is closed. A formed wire loop pivotally mounted to the housing of the handle mechanism is provided to receive a padlock to lock the cover closed.

REFERENCES:
patent: 3213224 (1965-10-01), Mrenna
patent: 3229056 (1966-01-01), Turnbull
patent: 3801765 (1974-04-01), Hodgson
patent: 3980845 (1976-09-01), Gryctko

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