Portable intrusion alarm

Details Portable intrusion alarm Portable intrusion alarm

1975-10-24

1977-11-22

Swann, III, Glen R.

Communications: electrical

Systems

Call station

2482261, 340283, G08B 1308

Patent

active

040598322

ABSTRACT:
A portable device for signaling the unauthorized movement of a closure member embodies an adjustable hanger bracket and an improved spring hinge construction which renders the device more sturdy, more reliable in operation and less expensive to manufacture. The alarm device also features a powerful buzzer powered by batteries in a unique holder.

REFERENCES:
patent: 3261010 (1966-07-01), Kardel
patent: 3270333 (1966-08-01), La Barber
patent: 3798627 (1974-03-01), Kaufman
patent: 3878539 (1975-04-01), Gooding

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