Communications: electrical – Land vehicle alarms or indicators – Of burglary or unauthorized use
Patent
1975-01-31
1977-01-04
Waring, Alvin H.
Communications: electrical
Land vehicle alarms or indicators
Of burglary or unauthorized use
340213R, 340276, 317 31, G08B 1900
Patent
active
040018199
ABSTRACT:
Combined intrusion detection and fire detection, or hazard detections, alarm system incorporating, for example, a plurality of intrusion, or first hazard, detection loop circuits and a plurality of fire, or second hazard, detection loop circuits, all of controlled resistance, operatively associated to a regulated voltage source. Integrated circuit operational amplifiers are operatively associated, or connected, with said detection loop circuits, or protective loops, as comparators to compare the voltage drop across said protective loops with reference voltages to provide sensing of variation in the voltage drop across the respective protective loop corresponding to a short or an open circuit condition having developed in the respective loop by detecting variance of the respective protective loop voltage drop relative to said reference voltages so that open and closed circuit detector devices may be and are connected within the same protective loop and mixed therein. Integrated circuit logic in this alarm system provides memory of the occurrences of security breaches, entry and exit delays, pulsating or steady alarm indication outputs to differentiate between hazard detections, for example, fire breach of security, intrusion breach of security or fire and intrusion breaches of security, and enunciator indication of breach, or breaches, of security in any one protective zone or in any combination of a plurality of said protective zones. Security alarm is also provided to assure correct and proper operation of the system, and individual intrusion protective loops may be and are selectively disabled without disabling the fire protective loop associated with the same protective zone. A protective loop includes a fixed terminating resistance and a pair of wires between said terminating resistance and the pair of terminals thereof so that normally closed alarm detector devices may be and are wired in series with said terminating resistance and normally open detector devices may be and are wired in parallel with said terminating resistance with the same pair of wires.
REFERENCES:
patent: 3754221 (1973-08-01), Stelter
patent: 3808534 (1974-04-01), Summers et al.
patent: 3813666 (1974-05-01), Gately
patent: 3836790 (1974-09-01), Becker
Glass Hyman F.
Waring Alvin H.
Wise Security Corporation
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