Alarm circuit for monitoring removal of plug from electrical pow

Details Alarm circuit for monitoring removal of plug from electrical pow Alarm circuit for monitoring removal of plug from electrical pow

1976-05-17

1978-02-21

Swann, III, Glen R.

Communications: electrical

Systems

Call station

200 511, G08B 1314

Patent

active

040756173

ABSTRACT:
An alarm circuit for deterring the theft of electrical devices of the type normally plugged into an electrical power receptacle by providing an alarm signal whenever the electrical plug associated with the electrical device has been removed from the receptacle. The alarm circuit comprises an electrical power receptacle having hot, neutral and ground female contacts adapted to receive an electrical plug having corresponding electrical contacts, the receptacle also including a switch for connecting the neutral conductor to the ground conductor upon insertion of at least one of the male contacts associated with the plug. An indicating circuit in association with the receptacle provides an alarm signal when the electrical plug is removed from the receptacle.

REFERENCES:
patent: 3090948 (1963-05-01), Cremer
patent: 3408643 (1968-10-01), Sliman
patent: 3411150 (1968-11-01), Schulein
patent: 3786502 (1974-01-01), Stendig et al.

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