Communications: electrical – Systems – Call station
Patent
1974-01-03
1976-04-20
Caldwell, John W.
Communications: electrical
Systems
Call station
340216, 340224, 340310R, G08B 1710, G08B 108, H04M 1104
Patent
active
039522946
ABSTRACT:
An emergency alarm system for detecting smoke in remote areas and for transmitting an indication of detected smoke, either via communications channels already within a facility being protected or by way of telemetry to an alarm indicating device. A fault detector is also provided for indicating when any component of the system becomes defective or otherwise nonfunctional. More specifically, a plurality of smoke detectors of the ion chamber type are positioned at strategic points within a facility to be protected. When any one of the smoke detectors is appropriately activated by smoke, an output in the form of a time duration modulated ultrasonic signal is generated, which is coupled via telemetry or communications channels within the facility being protected to a responder unit which is provided at a central location. If the generated signal persists longer than a predetermined time, an alarm indicator is energized to indicate that smoke is present at one of the smoke detectors. If a fault occurs, such as when one of the smoke detectors becomes disconnected, no ultrasonic signal will be generated and transmitted over the communications channels and, accordingly, a slave timer in the responder unit will not be appropriately deactivated, thereby causing a signal which energizes a fault indicator.
REFERENCES:
patent: 3697984 (1972-10-01), Atkinson et al.
patent: 3778796 (1973-12-01), Honda
Emerson Frank W.
Novacek George J.
Caldwell John W.
General Time Corporation
Myer Daniel
LandOfFree
Smoke detection alarm system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Smoke detection alarm system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Smoke detection alarm system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1590601