Communications: electrical – Systems – Call station
Patent
1974-05-07
1976-08-10
Swann, III, Glen R.
Communications: electrical
Systems
Call station
340256, G08B 1322
Patent
active
039744922
ABSTRACT:
An alarm system detects the electrical disconnection of electrical equipment such as an appliance which connects by a power plug to a power receptacle on an AC power line. The detection and alarm generating portion of this system is preferably located in a conventional AC power receptacle box and includes a power receptacle which accomodates a conventional power plug from the electrical equipment. When the detection and alarm system is active, a pair of switches is set upon insertion of the plug into the receptacle and, thereafter, if the plug is removed from the receptacle, the alarm is energized. In various embodiments of the invention, the alarm is also energized when any of the following events occur: 1. The power line from the plug to the electrical equipment is cut or is short circuited to ground. 2. The system in the receptacle box is mechanically disturbed. 3. AC power fails and the plug is removed from the receptacle or the power line from the plug to the electrical equipment is cut or short circuited to ground and/or the system in the box is mechanically disturbed.
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Dunn Robert T.
Swann III Glen R.
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