System for detecting an alarm
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United States of America Patent
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Aug 20, 1985
Grant Date -
N/A
app pub date -
Jun 23, 1983
filing date -
Jun 30, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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