Warning device and receptacle adaptor

Details Warning device and receptacle adaptor Warning device and receptacle adaptor

1976-11-12

1978-06-27

Waring, Alvin H.

Communications: electrical

Systems

Call station

200 511, G08B 1302

Patent

active

040978435

ABSTRACT:
A warning device, and a receptacle adaptor, the former being connectable between an electrical appliance and power source, for warning of a power interruption to the appliance, and including the receptacle adaptor having a reciprocable spring-biased pin in a channel, communicable with a micro-switch and an appliance plug grounding prong, for activating an alarm when the prong is withdrawn from the channel.

REFERENCES:
patent: 2931019 (1960-03-01), Walters
patent: 3192518 (1965-06-01), Sliman
patent: 3537095 (1970-10-01), Cones
patent: 3596019 (1971-07-01), Koester
patent: 3794989 (1974-02-01), Manley et al.
patent: 4009474 (1977-02-01), Eller

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