Fail-safe relay system

Details Fail-safe relay system Fail-safe relay system

1979-07-24

1981-07-21

Miller, J. D.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

340507, 340552, 192129R, 361175, H01H 4732

Patent

active

042801648

ABSTRACT:
A fail-safe relay system for use in infrared security barriers or other apparatus producing a sensing signal so as to control the de-activation and permit the re-activation of an interconnected device; such as a machine press. The relay system uses two relays with contacts in series in conjunction with electronic circuitry. Safe-start operation for preventing reactivation of the interconnected device if any unsafe condition exists, including failure of either pair of relay contacts to open when an unsafe condition is sensed, is also accomplished.

REFERENCES:
patent: 3412292 (1968-11-01), Forbes
patent: 3660731 (1972-05-01), Darrow
patent: 3704396 (1972-11-01), MacDonald
patent: 3761738 (1973-09-01), Kay et al.
patent: 3836828 (1974-09-01), Siggel
patent: 3858095 (1974-12-01), Friemann et al.
patent: 3953770 (1976-04-01), Hayashi
patent: 4075961 (1978-02-01), Harris
patent: 4130764 (1978-12-01), Darrow

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