Threshold plate door alarm

Details Threshold plate door alarm Threshold plate door alarm

1978-04-20

1980-02-12

Yasich, Daniel M.

Signals and indicators

Alarms

Burglar

42 1TB, G08B 1308

Patent

active

041877977

ABSTRACT:
A door alarm apparatus, for signaling when a door has been jimmied or otherwise set ajar, is provided having a member which may be propped or otherwise jammed against a door, this door being in the normally closed position, for activating an alarm connected to this member where the member may be positioned in a fixed and predetermined spatial relationship to the threshold plate of the door whereby an anchoring component part of the may slidably mate with an anchoring component affixed to the threshold plate.

REFERENCES:
patent: 11131 (1854-06-01), McDugall
patent: 61061 (1867-01-01), Fitzhugh
patent: 252095 (1882-01-01), Giles
patent: 718211 (1903-01-01), Lombard

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