Door burglar alarm system

Details Door burglar alarm system Door burglar alarm system

1978-04-20

1981-08-18

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

340541, 340542, 200 6164, 200 6167, 116 86, 49 13, 160 10, G08B 1308

Patent

active

042849802

ABSTRACT:
A door burglar alarm system having, preferably, a door movement intercepting component which may be moved easily in the direction of door movement by an opening motion of a door and which may be connected to a trigger mechanism to initiate an alarm signal in response to a predetermined distance having been traversed by the intercepting component, this intercepting component whereupon may provide a positive resistance prohibiting the further movement thereof in the direction of opening the door whereby the door is also prohibited from opening further.

REFERENCES:
patent: 487128 (1892-11-01), Reynolds
patent: 700652 (1902-05-01), Janke
patent: 1562589 (1925-11-01), Replogle
patent: 2691357 (1954-10-01), Owen
patent: 3312968 (1967-04-01), Kiefer
patent: 3541276 (1970-11-01), Lea
patent: 3727210 (1973-04-01), Hawkins
patent: 3798627 (1974-03-01), Kaufman
patent: 3968337 (1976-07-01), Cole
patent: 4123752 (1978-10-01), Novotny

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