Safety device

Details Safety device Safety device

1982-09-28

1985-06-18

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

Identifying or correcting improper counter operation

371 62, 377 16, G06F 1128, G06F 1546

Patent

active

045244499

ABSTRACT:
Safety device between a system for the control of a safety actuator and a logic circuit for controlling the actuator.
The device comprises sequential circuit for the transmission of logic signals supplied by the control system to the logic circuit, sequential checking circuit for applying to the logic circuit actuator release signals in the case of a failure of the contol system or of the tansmission circuit, the transmission of signals between the system and the logic circuit being carried out after checking the no-failure of the transmission circuit.

REFERENCES:
patent: 3786433 (1974-01-01), Notley et al.
patent: 3795800 (1974-03-01), Nimmo
patent: 3919533 (1975-11-01), Einolf et al.
patent: 4023109 (1977-05-01), Shreve
patent: 4090173 (1978-05-01), Sibley
patent: 4408328 (1983-10-01), Wakai

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