Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1978-01-03
1981-06-02
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
With particular system function
340506, 340508, 340527, 340531, 340533, 340535, 340541, 340547, 340548, 340549, 3403091, 200 6118, 335207, G08B 1312, G08B 2900
Patent
active
042714052
ABSTRACT:
In an alarm control system for protecting a premises, a four conductor bus line leading from a master control station is extended about the interior perimeter of the premises. Sensors positioned near each port of entry to be monitored are connected in parallel relationship to the bus line, as is at least one remote station for manually arming, disarming or activating the system. Each sensor comprises a biased reel carrying line secured to window, door, screen, or the like. Disturbance of a sensor causes a magnetically responsive switch therein to generate a pulse triggering circuitry within the control station to activate the desired alarm device for a predetermined period of time. The system then resets automatically to an armed or ready condition to continue protecting the premises against subsequent intrusions. Preferably, the lines in the sensors are of a thermoplastic material so that the system is also activated by abnormally high temperature in the event of fire. If desired, one or more key operated switches can be connected to the bus line to arm or disarm the system from the exterior of the premises.
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Caldwell Sr. John W.
Crosland Donnie L.
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