Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices
Patent
1979-08-02
1981-05-12
Broome, Harold
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Automatic circuit-interrupting devices
335 45, 335176, H01H 7174
Patent
active
042675391
ABSTRACT:
A circuit breaker comprising a solenoid coil, an armature actuatable by the coil and a magnetizable frame carrying the coil enclosed with a case comprising two abutting half-cases. A time delay device comprising a tube of non-magnetic material within which is a movable magnetizable core and with which the coil cooperates to actuate the armature after a time delay period upon predetermined energization of the coil. The tube has a pole piece at one end and the armature has an attractable portion which moves toward said pole piece on predetermined overload conditions, the core being biased toward the end of the tube away from the pole piece. An adjustable cam is carried between said half-cases. Said attractable portion of the armature being biased by a spring into engagement with said cam and away from said pole piece. Said cam being rotatable to vary the air gap between said pole piece and said attractable portion of the armature, whereby the trip point of the circuit breaker may be varied.
REFERENCES:
patent: 2934620 (1960-04-01), Middendorf
patent: 3329913 (1967-07-01), Camp
patent: 3831120 (1974-08-01), Powell et al.
patent: 3855557 (1974-12-01), Gryctko
Broome Harold
Denny, III Joseph G.
Heinemann Electric Company
Patane Peter J.
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