Burglar alarm for door knob

Details Burglar alarm for door knob Burglar alarm for door knob

1977-01-31

1978-07-11

Yusko, Donald J.

Communications: electrical

Condition responsive indicating system

Specific condition

200 6145R, G08B 1308

Patent

active

041005392

ABSTRACT:
A burglar alarm apparatus is provided with a housing adapted to slide over a door knob for actuation upon rotation or attempted rotation of the door knob. An insert is provided for insertion into the housing which has a protruding suction cup so that the door knob burglar alarm can be converted for use on windows or sliding glass doors or the like. The burglar alarm has a sensor switch of the platform and ball type, which is resettable and may be turned off by a single switch knob.

REFERENCES:
patent: 3175207 (1965-03-01), Hewitt, Jr.
patent: 3327300 (1967-06-01), Birrenkott
patent: 3725892 (1973-04-01), Faltico

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