Intrusion alarm system

Details Intrusion alarm system Intrusion alarm system

1981-03-31

1983-05-31

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340528, 340648, G08B 1320, G08B 1308

Patent

active

043863426

ABSTRACT:
An alarm system comprises a blower driven by an electric motor, the blower being fitted to the premises to be protected and serving to blow air into the premises. With all doors and windows shut the blower supplies a steady flow of air, the flow rate depending on the nature of the blower and how fast air can leak out of the premises around doors and windows, through air vents etc. The current drawn by the motor is constant in these circumstances and is monitored. When entry is made to the premises, by opening a door or window, the air flow rate increases and the load on the motor changes. This is reflected in a change in the current drawn by the motor and the blower can blow air from the premises, air entering around doors and windows etc.

REFERENCES:
patent: 3289192 (1966-11-01), Davey
patent: 3833895 (1974-09-01), Fecteau
patent: 3934239 (1976-01-01), Mason et al.
patent: 3947838 (1976-03-01), La Forge, Jr.

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