Burglar alarm

Details Burglar alarm Burglar alarm

1979-09-17

1981-05-26

Goldberg, Gerald

Signals and indicators

Alarms

Burglar

116 5, 116152, 116215, G08B 1308

Patent

active

042691362

ABSTRACT:
A gong or bell attached to a door such that when a thief breaks open the door, a ball or like object having a rod extending therethrough and resting on a ledge which projects from the top of a frame for the door, falls along the rod as the ball or like object is pushed with the door out of a slot in the ledge and rings the gong or bell by striking it and a spring which prevents muffling of the sound.

REFERENCES:
patent: 713782 (1902-11-01), MacDonald
patent: 1003636 (1911-09-01), Mohler
patent: 1483708 (1924-02-01), Bell
patent: 1868742 (1932-07-01), Gatter
patent: 4203383 (1980-05-01), Hill

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