Self-contained burglar alarm system - includes impact detector and door opening detector mounted in small case fixed to door

Abstract

Abstract The burglar alarm has a contact (1) which actuates an impervisory timer (2). The timer (2) actuates an inhibition circuit of a detected impact memory circuit (8) of an impact detector (7). The timer (2) also actuates a memory circuit (9) of a door opening detection circuit (6). The door opening memory circuit (9) and the impact memory circuit (8) actuate an opening timer (10) which itself actuates a timer (11). The timer (11) controls and regulates the sequential operation duration of a siren (13) and zero resets the memories (8, 9) when there are no signals from the opening and impact detectors, (6, 7).

Inventors

No inventors recorded.

Bibliographic Details