Visual burglar alarm

Details Visual burglar alarm Visual burglar alarm

1976-04-02

1977-08-09

Queisser, Richard C.

Signals and indicators

Alarms

Burglar

116114K, 337207, G08B 1308

Patent

active

040403815

ABSTRACT:
A visual burglar alarm in the form of a mechanism for indicating that a door has been opened at least once during the absence of the occupant and therefore that caution should be exercised by the occupant in entering the room closed off by the door; the mechanism includes a tubular housing having a constriction narrowing a portion of the bore, means for attaching the tubular housing upright at the upper margin of a door, a magnet loosely held in the bore above the constriction, a non-magnetic shank extending down from the magnet and loosely passing through the constriction, and means for causing the magnet to adhere at the door jamb when thrust up from below by pressure on the lower end of the shank, so that when the door opens the magnet falls and gives indication of intrusion.

REFERENCES:
patent: 2600581 (1952-06-01), Schenendorf
patent: 3448620 (1969-06-01), Ryan
patent: 3516036 (1970-06-01), Lea
patent: 3915112 (1975-10-01), Forester

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