Communications: electrical – Systems – Call station
Patent
1975-03-14
1976-05-25
Caldwell, John W.
Communications: electrical
Systems
Call station
340282, 339 36, 200 50A, G08B 2100
Patent
active
039597903
ABSTRACT:
An appliance alarm device communicates between a wall receptacle having at least two receptacles and the end plug of a cord of an appliance. The appliance alarm device includes a housing having a movable front wall. A pair of male connectors each having a pair of prongs extend through the rear wall of the housing, wherein the prongs are adapted to be received in the sockets of the wall receptacle. A female receptacle is mounted in the interior chamber of the housing and is aligned with a large circular hole in a sidewall of the housing. An indicator light is contained in the other sidewall of the housing. A switching member having a movable contact arm and an alarm member are contained in the housing. A first series circuit consists of the first male connector, the alarm member and the switching member. A second series circuit consists of the second male connector and the female receptacle. A movable plate is slidably contained on the inside surface of the one sidewall above the large circular opening, wherein the plate moves up and down across the opening in front of the female receptacle. A mechanism is provided for controlling the movement of the plate which communicates with the movable contact arm of the switching member.
REFERENCES:
patent: 2916733 (1959-12-01), Hirsch
patent: 3192518 (1965-06-01), Sliman
patent: 3618065 (1971-11-01), Trip
patent: 3781857 (1973-12-01), Stenoig
Caldwell John W.
Lawrence Peska Associates Inc.
Nanfeldt Richard E.
Wannisky William M.
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