Vehicle window heater control device

Details Vehicle window heater control device Vehicle window heater control device

1974-10-29

1976-03-16

Miller, J. D.

Electric heating

Microwave heating

Tunnel furnace

219203, 219492, H02H 4732

Patent

active

039448932

ABSTRACT:
The specification discloses a control device for an automotive window heater energized by an alternator having a field winding and comprising a manual switch terminal, an ignition terminal, a battery terminal, indicator terminal, field winding terminal and a ground terminal; a first normally open relay having a winding and a first normally open armature switch; a triggerable switch device electrically in series with said first relay winding between said ignition terminal and ground; a trigger circuit for said triggerable switch electrically disposed between ground and said manual switch terminal; a timing circuit including a chargeable condenser; a second relay having a winding and a second normally open armature switch; and a voltage responsive switch responsive to a voltage greater than a predetermined value and electrically in series with said winding of said second relay between ground and said indicator terminal; said first and second relay switches when closed connecting said indicator terminal respectively to said battery terminal and said field winding terminal.

REFERENCES:
patent: 3624354 (1971-11-01), Heidorn
patent: 3790745 (1974-02-01), Levin
patent: 3858027 (1974-12-01), Phillips

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