Portable alarm for entry detection

Details Portable alarm for entry detection Portable alarm for entry detection

1979-08-07

1981-04-28

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

200 6152, 340689, 340693, G08B 1308

Patent

active

042648998

ABSTRACT:
A portable alarm consists of a unit which emits an alarm signal when it is tilted to a predetermined extent from its upright position, and having a base support which will support the unit in a condition of unstable equilibrium, and a stay which, when the unit is stood substantially upright near to a door, for example, may be rested against the door to impart stability to the unit, which will fall from the upright position and emit the alarm signal if the door is opened to move the stay.

REFERENCES:
patent: 3488651 (1970-01-01), Brenner
patent: 3601729 (1971-08-01), Hierta

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