Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices
Patent
1976-01-02
1977-09-20
Broome, Harold
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Automatic circuit-interrupting devices
335174, H01H 7510, H01H 7706, H01H 8104
Patent
active
040500390
ABSTRACT:
A magnetic trip assembly for use in a device such as an electric circuit breaker. The magnetic trip assembly includes a magnet and an armature arranged with respect to the magnet to coact with a pole face of the magnetic member which is in a plane normal to the magnetic plane of the magnetic member. An electrical load conductor is coupled to the magnetic member and establishes together with the magnetic member a magnetic field for closure of the armature in response to specified, excessive values (short circuit or overload values) of current passing through the load conductor. When the armature is operated to its closed position, a first portion of an actuating and latch member abutting against the armature is caused to move, in turn causing a captive, generally-cylindrical portion of the actuating and latch member to rotate. Rotation of the second portion of the actuating and latch member causes a latch release element extending from the second portion to withdraw, or become unlatched, from the latch mechanism of the circuit breaker, causing the breaker to trip and to thereby protect a load circuit connected with the load conductor.
The magnetic trip assembly in accordance with the invention contains a small number (five) of components, all of which are simple in design and easily fabricated and assembled together. Further, the use of an armature and actuating and latch member in conjunction with a pole face of the magnetic member which is normal to the magnetic plane of the magnetic member results in a substantial mechanical advantage between the armature and the actuating and latch member, thereby producing a definite and positive tripping action by the actuating and latch member.
REFERENCES:
patent: 2673264 (1954-03-01), Cole
patent: 3296564 (1967-01-01), Cellerini
patent: 3421123 (1969-01-01), Johnson et al.
patent: 3487343 (1969-12-01), Myers et al.
patent: 3548358 (1970-12-01), Klein
Broome Harold
Nealon Elmer J.
O'Malley Norman J.
Xiarhos Peter
Zinsco Electrical Products
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