Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices
Patent
1978-12-08
1981-09-08
Broome, Harold
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Automatic circuit-interrupting devices
335 27, 335207, H01H 7302, H01H 7330
Patent
active
042887674
ABSTRACT:
An automatic magnetic switch comprising an over-load or short-circuit protection means and a manual magnetic switch installed in the switch casing. A magnetic control means is contained in a sub-casing of the switch. The manual magnetic switch has a conductive plate with an electrical contact fixedly mounted in its casing and another conductive plate, generally rigid and inflexible, has an electrical contact mounted thereon for pivoting or sliding movement. Permanent magnets, one on the movable plate, and one outside the casing urge the movable plate to a contact engaging position when the outside magnetic member is brought proximate to the casing, and a spring is used to restore the movable plate to its non-engaging position when the outside magnetic member is moved away from the casing. The magnetic control means of said embodiment has a T-lever actuatable by protection means, and a control lever having a second magnet mounted thereon corresponding to a first magnet on the T-lever, a pair of first and second control parts being mounted on a coupling arm of the control lever to lock in first and second stop recesses of a control rod to thereby control the movement of the outside magnet away from or towards the switch casing.
REFERENCES:
patent: 3852692 (1974-12-01), Moorman
patent: 3930213 (1975-12-01), Richards
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