Method and apparatus for heating the cylinder of a vehicle door

Details Method and apparatus for heating the cylinder of a vehicle door Method and apparatus for heating the cylinder of a vehicle door

1991-05-28

1992-10-06

Reynolds, Bruce A.

Electric heating

Heating devices

Combined with diverse-type art device

219202, 70431, 307 101, 307141, H05B 102

Patent

active

051534100

ABSTRACT:
A circuit is provided for activating a heating element to deice a lock cylinder of a door system. A handle switch is coupled to a door handle of the door system and is constructed to provide a signal when the door handle is moved in an unlatching position. The handle switch provides the signal so long as the door handle is in the unlatching position. The activator circuit measures the time that the door handle is in the unlatching position and, after the door handle has been in the unlatching position for a predetermined time interval, begins to provide electrical energy to the heating element. The activator circuit measures the time period that electrical energy is provided to the heating element and, after a predetermined interval, discontinues providing electrical energy to the heating element.

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patent: 4822976 (1989-04-01), Buranathanit
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