System for detecting an alarm

Details System for detecting an alarm System for detecting an alarm

1983-06-23

1985-08-20

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

340511, G08B 2100

Patent

active

045367515

ABSTRACT:
A system for detecting an alarm for emergency situations of a door or a window of a building or house in a predetermined guard area, comprising: an alarm circuit, including a plurality of alarm switch units for detecting emergencies and a resistor and a capacitor connected between first contacts and second contacts of the alarm switch units; and an alarm device, including a detecting circuit for detecting voltage changes of a predetermined measuring point, a pulse oscillator for generating a pulsating voltage, and a transistor for repeatedly turning on and off the current in response to the pulsating voltage applied from the pulse oscillator.

REFERENCES:
patent: 4170005 (1979-10-01), Duke
patent: 4361833 (1982-11-01), Allgood
patent: 4441100 (1984-04-01), Galloway

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