Alarm and safeguard system

Details Alarm and safeguard system Alarm and safeguard system

1996-01-16

1998-03-10

Swann, Glenn

Communications: electrical

Condition responsive indicating system

Specific condition

52 1, 52750, 169 23, 169 61, 340515, 340516, 340540, 340587, G08B 1706, G08B 2100

Patent

active

057266379

ABSTRACT:
A set of first and second detecting units detects an emergency. First and second pseudo-emergency generating units generate a pseudo-emergency for the first and second detecting units. A driving unit alternately drives the first and second pseudo-emergency generating units. An abnormality detecting unit detects operation of the first and second detecting units detecting the pseudo-emergency from the first and second pseudo-emergency generating units, the abnormality detecting units performing a predetermined indication when thus-detected operation is abnormal. An emergency detection outputting unit, in an emergency, outputs an emergency detection signal in response to reception of emergency detection signals from both the first and second detecting units.

REFERENCES:
patent: 4518952 (1985-05-01), Tanaka et al.
patent: 4595914 (1986-06-01), Siegel
patent: 5172099 (1992-12-01), Glaser
patent: 5544716 (1996-08-01), White

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