Intrusion alarm

Details Intrusion alarm Intrusion alarm

1980-05-22

1982-07-20

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

200 6162, 200 6193, 340572, G08B 1312

Patent

active

043408842

ABSTRACT:
An intrusion alarm comprised of a retractible cord having a releasable member attached to one end of the cord. The releasable member can be held at one side of an entry way such as a door way, holding the cord extended. A retractor mounted at the other side of the entry way so as to retract the cord when the releasable member is released, such as by the opening of a door. The alarm includes a power source and a signal, these being operatively connected to sound an alarm when the releasable member is released. The releasable member may be such as a magnet, and it can also be used as a switch to connect the power supply to the signal.

REFERENCES:
patent: 882570 (1908-03-01), Liaci
patent: 914173 (1909-03-01), Norpoth
patent: 2780689 (1957-02-01), La Cavera
patent: 2897307 (1959-07-01), Johnston
patent: 3175207 (1965-03-01), Hewitt, Jr.
patent: 3450852 (1969-06-01), Rhodes
patent: 3887909 (1975-06-01), Beiswenger et al.
patent: 4271405 (1981-06-01), Kitterman

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