Portable mechanical burglar alarm

Details Portable mechanical burglar alarm Portable mechanical burglar alarm

1989-11-15

1991-06-11

Yasich, Daniel M.

Signals and indicators

Alarms

Burglar

116 86, 116157, G08B 1308

Patent

active

050223402

ABSTRACT:
A portable mechanical burglar alarm for monitoring doors and windows includes a base plate having a back surface provided with a plurality of suction cups for releasable securement adjacent a door or window. A pair of bells are secured in spaced relation on a front surface of the base plate and a pivotal oscillating clapper arm is disposed therebetween. A spring powered bell ringing mechanism is enclosed by a housing on a front surface of the base plate. A trigger mechanism within the housing is operative to actuate the bell ringing mechanism upon disengagement of an adjustable abutment stop member from contact with a door or window frame upon opening of the door or window. A retaining mechanism within the housing prevents unauthorized resetting of the trigger mechanism subsequent to activation, to prevent the ringing bells from being silenced.

REFERENCES:
patent: 452597 (1891-05-01), Davis
patent: 568532 (1896-08-01), Hauser
patent: 589540 (1897-09-01), Towler
patent: 1445974 (1923-02-01), Rycraft
patent: 1854126 (1932-04-01), Ferguson
patent: 1859345 (1932-05-01), Schantz
patent: 2193452 (1940-03-01), Gauthier
patent: 3921564 (1975-11-01), Murray
patent: 3926140 (1975-12-01), Bargiel
patent: 3960105 (1976-06-01), Ring
patent: 4067289 (1978-01-01), Joyner, Jr.

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