Fail-safe control circuit

Details Fail-safe control circuit Fail-safe control circuit

1985-11-12

1988-05-17

Ruggiero, Joseph

Boots, shoes, and leggings

303 92, 364426, 371 68, 371 71, G06F 1116, G05B 902

Patent

active

047455420

ABSTRACT:
A fail-safe control circuit which requires that all control units produce control signals to operate a controlled device. The control units receive a feedback signal used for comparing with the control signal. When the control signal and the feedback signal do not match, a power supply interruption or disagreement signal causes a relay to disconnect power to the controlled device placing the controlled device in a fail-safe state.

REFERENCES:
patent: 3829668 (1974-08-01), Noumi et al.
patent: 3882406 (1975-05-01), Graves et al.
patent: 4096990 (1978-06-01), Strelow
patent: 4198678 (1980-04-01), Maatue et al.
patent: 4270168 (1981-05-01), Murphy et al.
patent: 4400792 (1983-08-01), Strelow
EP Search Report 85308263.

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