Cable drum construction of door lift mechanism for multiple horizontal panel garage door with disproportionally heavy top portion
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United States of America Patent
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Sep 8, 2015
Grant Date -
Feb 28, 2013
app pub date -
Nov 10, 2011
filing date -
Aug 23, 2011
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Abstract
A cable lift mechanism for a multi panel, overhead garage door includes a drum having a spiral groove comprised of two adjacent sections that are generally coaxial with the longitudinal axis of the cable drum. The groove or grooves in a first section adjacent the attachment end of the cable to the drum have a lesser radius than the remaining grooves of the second section of the drum which have substantially equal radii of greater diameter than the first section radii. As a consequence, initial torque associated with lifting of a garage door is increased to lift a heavier upper or top panel or panels of a multi-panel garage door.
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