Electronic security device

Details Electronic security device Electronic security device

1978-03-30

1979-11-27

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

331 65, 340514, G08B 1326

Patent

active

041763483

ABSTRACT:
An electronic security device includes an insulated loop shaped antenna which capacitively couples to any objects which intrude into a zone surrounding the antenna. The loop shape allows the antenna to be placed onto a doorknob of the room to be secured, and the insulation prevents electrical contact-bounce between the antenna and the doorknob. A detector circuit connects to the antennna and generates output signals indicating the amount of capacitive coupling. An alarm circuit connects to the detector circuit and sounds an audible alarm for a predetermined time interval when the coupling as indicated by the output signals implies that an object has intruded into the zone. A test circuit connects to the alarm circuit for temporarily decreasing the time interval of the alarm in response to a manually activated switch to allow the security device to be tested prior to being fully activated.

REFERENCES:
patent: 3761912 (1973-09-01), Stettner et al.
patent: 3784848 (1974-01-01), Hamilton
patent: 4083022 (1978-04-01), Nijman
patent: 4091371 (1978-05-01), Mason, Jr. et al.

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