Electric safety switch circuitry

Details Electric safety switch circuitry Electric safety switch circuitry

1976-04-15

1977-09-13

Goldberg, Gerald

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361195, H01H 4700

Patent

active

040486664

ABSTRACT:
In an electric safety switch circuit for use in apparatus having at least one safety switch for detecting at least one abnormal condition of the apparatus, switching elements are connected between a power source and the apparatus. The voltage of the main power source is transformed to a lower voltage and the switching elements are opened or closed by control circuitry in the low voltage circuit. The at least one safety switch is connected to the voltage transformer and the control circuitry such that the actuation of the at least one safety switch upon detection thereof of an abnormal condition actuates the control circuitry to open the switching elements and disconnect the apparatus from the power source.
In one embodiment a primary switch is interconnected between the power source and the electric safety switch circuit, and in a modified embodiment the primary switch is connected in the electric safety switch circuit itself. The reduction in the voltage and current in which the primary switch and/or the at least one safety switch are interconnected results in improved reliability, durability, and operating life of the electric circuit as well as providing commensurate decreases in the cost of the electric circuit.

REFERENCES:
patent: 2375229 (1945-05-01), Klemperer
patent: 2882456 (1959-04-01), Koch
patent: 2962633 (1960-11-01), Raymond
patent: 3662227 (1972-05-01), Morrison et al.

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