Safety interlock circuit with diagnostics requiring no extra...

Details Safety interlock circuit with diagnostics requiring no extra... Safety interlock circuit with diagnostics requiring no extra...

2007-03-20

2007-03-20

Trieu, Van T. (Department: 2612)

Communications: electrical

Condition responsive indicating system

C340S520000, C340S524000

Reexamination Certificate

active

11125896

ABSTRACT:
A safety interlock circuit wherein the safety interlock switches can report their status. Signal generators associated with the safety interlock switches produce status signals that are transmitted on the wiring of the safety interlock circuit. The present invention is ideal for retrofitting current installations because no additional wiring is required for carrying the status signals.

REFERENCES:
patent: 4146884 (1979-03-01), Kurn
patent: 4638299 (1987-01-01), Campbell
patent: 5039940 (1991-08-01), Johnson et al.
patent: 5233323 (1993-08-01), Burkett et al.
patent: 5805074 (1998-09-01), Warren et al.
patent: 6417582 (2002-07-01), Dold et al.
patent: 2729480 (1979-01-01), None
patent: 4221916 (1994-01-01), None

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