Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1989-03-03
1990-07-24
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340531, 340539, 340546, 340541, 340555, 340693, 370 40, 370 44, G08B 1900, H04M 1100
Patent
active
049437992
ABSTRACT:
A portable alarm system includes a compact portable sealed housing having an electronic alarm control circuit therein. An electrical a.c. cord supplies power to the control circuit and plugs into the housing. A telephone jack connects a telephone circuit to a dialer circuit within the control circuit. A digital key pad is secured to the housing and has a plurality of switches actuable exteriorly of the housing whereby to program the control circuit by a lessor person and for actuating or deactuating the control circuit by a lessee user person. A receiver circuit is also provided in the housing and is connected to the control circuit. One or more wireless infrared detectors are detachably secured to the housing and positioned to detect moving objects within an environment to be protected. The detectors have infrared transmitters, of different frequencies, and transmit alarm signals to the receiver. The receiver has a first channel which is responsive to a first detector and is connected to the control circuit through a delay circuit so that the control circuit only switches to an alarm state to generate an alarm code on the telephone line after a predetermined time delay. The second channel of the receiver has no delay circuit. A siren is connected to the control circuit and secured to the housing to generate an audible local alarm upon activation of the control circuit to the alarm state.
REFERENCES:
patent: 4560978 (1985-12-01), Lemelson
patent: 4602246 (1986-07-01), Jensen
patent: 4742336 (1988-05-01), Hall et al.
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