Safety monitor

Details Safety monitor Safety monitor

1985-11-14

1990-06-05

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

340539, 340686, G08B 2300

Patent

active

049317725

ABSTRACT:
A radio frequency transmitter is adapted to be worn by a worker in a confined space. The transmitter includes a manual switch and a mercury switch which, when tilted by reason of the worker getting out of his normal work position, closes to cause the transmitter to emit a signal which is received by a receiver positioned outside of the confined space. The receiver closes a switch to put the coil of a relay across a power supply. The relay closes two switches, one being an alarm switch which causes energization of a strobe light and a siren; the other establishes a holding circuit by-passing the receiver actuated switch. The holding circuit includes an interrupt switch to turn off the alarm. There is a time delay in the relay circuit to avoid false alarms. Once the alarm is sounded, termination of the radio frequency signal alone will not stop the alarm; the switch in the holding circuit must also be opened.

REFERENCES:
patent: 3588858 (1971-06-01), Denuth
patent: 3866204 (1975-02-01), Barkley
patent: 4359723 (1982-11-01), Cohen
patent: 4468656 (1984-08-01), Clifford et al.

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