Device for remote surveillance of the current supply to an elect

Details Device for remote surveillance of the current supply to an elect Device for remote surveillance of the current supply to an elect

1990-09-14

1992-07-07

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

340635, 379 39, 324133, G08B 2100

Patent

active

051286572

ABSTRACT:
The present invention is concerned with a device for observing from a distance the change of mode in feed current by city current of an electrical appliance by means of a telephone line characterized in that it comprises: means for detecting the presence or the absence of city current to the feed terminals of the electrical appliance, control means, triggered by the detecting means when there occurs a change of mode in the feed of said electrical appliance, switch means, capable of placing the telephone line either in a first free position or in a second engaged position, the control means acting upon the switch means to reverse the position of the telephone line when the detecting means detect a change of mode in the feed of said electrical appliance by city current. (FIG. 1).

REFERENCES:
patent: 3922490 (1975-11-01), Pettis
patent: 4028688 (1977-06-01), Goleman
patent: 4777479 (1988-10-01), Hinckley

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