Door alarm

Details Door alarm Door alarm

1988-10-17

1990-07-17

Shoap, Allan N.

Signals and indicators

Alarms

Burglar

116 6, 116155, G08B 1308

Patent

active

049414240

ABSTRACT:
A sonic alarm device is provided for signalling the opening of a door which is hingedly mounted adjacent the edge on a door frame for swinging movement about an upright hinge axis into and out of a closed position. The door alarm is mounted in the interior of the door. The door alarm comprises a housing for the alarm, an isolator inside of the housing, wherein the isolator supports a sonically activated device. A spring holder is mounted within the isolator, and spring is mounted on the spring holder in a position horizontal to the door. When the door is in a closed position, the spring is pushed back into the interior of the housing; the spring is designed to be released when the door is opened. A hammer actuator is contacted by the spring when the door is opened, and a hammer is struck by the hammer actuator when the door is opened. The hammer then contacts a sonically actuated device to cause the device to produce an audible sound.

REFERENCES:
patent: 386164 (1888-07-01), Sanderson
patent: 515260 (1894-02-01), Smith
patent: 517869 (1884-04-01), Lawlor
patent: 667799 (1901-02-01), Shore
patent: 929590 (1909-07-01), Hartwell
patent: 1296982 (1919-03-01), Lohrens
patent: 1398362 (1921-10-01), Cook
patent: 1419738 (1922-06-01), Klomfass
patent: 1567921 (1925-12-01), D'Almaforte
patent: 2760460 (1956-08-01), Short
patent: 3013523 (1961-12-01), Phillips
patent: 3895599 (1975-07-01), Berkowitz
patent: 4523184 (1985-06-01), Abel
patent: 4567846 (1986-02-01), Kurtz

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