Electricity: circuit makers and breakers – Special application – Indicating instrument
Patent
1976-12-02
1978-10-03
Schaefer, Robert K.
Electricity: circuit makers and breakers
Special application
Indicating instrument
200308, 200 50A, H01H 922, H01H 916
Patent
active
041186087
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 operating handle and housing of the mechanism when the cover is closed and also providing clearance for a catch which holds the cover closed. A defeatable cover interlock prevents opening of the cover when the switch is closed, and a defeatable switch interlock prevents closing of the switch when the cover is open. The handle mechanism housing is provided with a front recess having a pivoted indicator member therein which is connected by a wire link to the cradle of the trip free contact operating mechanism. When the cradle is in its tripped position the indicator member is operated so as to be viewable through a transparent cover portion of the recess to indicate that opening of the switch resulted from fault conditions.
REFERENCES:
patent: 2420842 (1947-05-01), Schymik
patent: 3225170 (1965-12-01), Chabala
patent: 3296393 (1967-01-01), Rimmer
patent: 3801765 (1974-04-01), Hodgson
patent: 3896353 (1975-07-01), Burton
patent: 3916133 (1975-10-01), Bollinger
patent: 3980845 (1976-09-01), Gryctko
patent: 4011424 (1977-03-01), Ericson
Kussy Frank W.
Shaffer Howard R.
Feeney William L.
I-T-E Imperial Corporation
Schaefer Robert K.
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