Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1995-05-12
1997-08-05
Mullen, Thomas
Communications: electrical
Condition responsive indicating system
With particular system function
340506, 340514, 340524, 340292, 340333, 364184, 364187, G08B 2900
Patent
active
056546912
ABSTRACT:
The present invention provides an auxiliary backup device of burglary alarm system, connected with an alarm output and an auxiliary power output of a burglary control panel and an alarm device, comprises in combination an electrical circuit having a relay means and a DC power source. The relay means comprises a diode connected in parallel with an operating coil which induces a normally opened switch and also a normally closed switch. The two terminals of the diode are connected to the auxiliary power output of the control panel. The normally opened switch is coupled in series with the alarm output of the control panel and the input of the alarm device, such as an audible and visual warning devices. The output of the DC power source is connected in series with the normally closed switch and the input of the alarm device. Accordingly, when the control panel works normally that the voltage of the auxiliary power output of the control panel is high, the normally opened switch is induced to close and the normally closed switch is induced to open. Thus, the alarm output of the control panel is connected directly to the input of the alarm device. If the control panel and wiring are vandalized, the auxiliary power output losses its voltage or power. Then, the normally opened switch open and the normally closed switch close. At that time, the DC power source energizes the alarm device.
REFERENCES:
patent: 4698621 (1987-10-01), Masot
patent: 5296750 (1994-03-01), Bozeman
patent: 5412542 (1995-05-01), Maudy
Chan Raymond Y.
Mullen Thomas
Pope Daryl C.
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