Power failure alarm

Details Power failure alarm Power failure alarm

1976-07-19

1978-02-14

Caldwell, Sr., John W.

Communications: electrical

Systems

Call station

340253C, 340326, 340371, 340400, G08B 2100

Patent

active

040742458

ABSTRACT:
An alarm device for connection between an electric appliance and a power source to provide an audible and visual signal of a power failure. The device includes a first circuit in series with the appliance and power source containing an electro-magnet holding a spirally wound spring hammer in spaced relation to a gong. Upon occurrence of a power failure, the electromagnet is deactivated, releasing the hammer which strikes the gong. Simultaneously, a second circuit in parallel to the first having a switch spring-biased to an open position in the path of movement of the hammer and connected to a light is closed by the hammer. Upon restoration of power, the light is activated to indicate the occurrence of the power failure. A post connected to the free end of the hammer is used to reset the device by returning the hammer to the influence of the electromagnet, also enabling the spring-biased switch to reopen, upon the restoration of power.

REFERENCES:
patent: 1194571 (1916-08-01), Swan
patent: 2681443 (1954-06-01), Caulk, Jr.
patent: 2820892 (1958-01-01), Spangler

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