Method and apparatus for ensuring safe operation of electric ove

Details Method and apparatus for ensuring safe operation of electric ove Method and apparatus for ensuring safe operation of electric ove

1997-04-14

2000-06-20

Lefkowitz, Edward

Communications: electrical

Condition responsive indicating system

Specific condition

340524, 340664, 521732, 318265, 318266, 318469, G08B 2100

Patent

active

060782633

ABSTRACT:
The sudden unrolling of an motor driven overhead door is a hazardous occurrence. The invention provides a method of detection and warning of a damaged counterbalance mechanism or other defect in the door lifting assembly. The amperage readings of the drive motor are observed to increase between 5% and 30%, above that of normal operation when the function of the counterbalance assembly or similar drive assembly component is compromised. The method is reduced to practice as a number of alternative electronic circuits which are placed between the line power source and the drive motor. The circuit senses the motor amperage draw and compares the reading with a preset threshold value. Upon the sensed value exceeding the threshold value, a warning is broadcast. This method alerts one of undue strain on a damaged lifting assembly prior to its catastrophic failure.

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