Electrical connectors including power failure warning means

Details Electrical connectors including power failure warning means Electrical connectors including power failure warning means

1977-11-16

1979-05-15

Caldwall, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

340663, G08B 2100

Patent

active

041550820

ABSTRACT:
An audible warning device is integrated within an electrical connector in the form of a mains plug or mains adaptor to produce an audible warning in the absence of the mains supply. The plug or adaptor may incorporate further circuits for producing distinctive warnings should the power supply be subsequently reconnected, and also should the voltage of an internal battery powering the device drop below a predetermined value. In the case of an adaptor, the device has such internal connections that a warning will be produced if the power supply plug becomes disconnected from the adaptor, the adaptor from the power supply socket, or both.

REFERENCES:
patent: 3383522 (1968-05-01), Appelbeck et al.
patent: 3670246 (1972-06-01), Gately
patent: 3801974 (1974-04-01), Aitken
patent: 3851322 (1974-11-01), Compoly et al.
patent: 3976986 (1976-08-01), Zabroski
patent: 4001803 (1977-01-01), Lombardo

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