Portable intrusion alarm

Details Portable intrusion alarm Portable intrusion alarm

1982-10-20

1984-03-06

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340689, G08B 1314

Patent

active

044357010

ABSTRACT:
A portable alarm includes a battery, a horn connected across the terminals of the battery, a position sensitive switch and a double pole, double throw magnetic latching relay, all mounted within a housing having an unstable base. The first coil, first relay switch and the position sensitive switch are connected in series with one another and in parallel with the battery. The second coil, second relay switch and silencing switch are connected in series with one another and in parallel with the battery. The horn and third relay switch are connected in series with one another and in parallel with the battery. Tipping the housing closes the position sensitive switch which energizes the first coil to open the first relay switch and close the second and third relay switches. Opening the first relay switch immediately de-energizes the first coil. However closing the third relay switch completes the circuit between the battery and the horn to sound the alarm. To silence the alarm the user must upright the alarm to open the position sensitive switch and actuate the silencing switch. This energizes the second coil to open the second and third switches to both shut off the horn and de-energize the second coil.

REFERENCES:
patent: 3345627 (1967-10-01), Herst et al.
patent: 3614763 (1971-10-01), Yannuzzi
patent: 3710371 (1973-01-01), Whalen et al.
patent: 4264899 (1981-04-01), Menzies et al.

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