Overhead door lift system

Details Overhead door lift system Overhead door lift system

2008-03-18

2008-03-18

Johnson, Blair M. (Department: 3634)

Flexible or portable closure, partition, or panel

Plural strip, slat, or panel type

With mounting or supporting means

C016S401000, C242S602100

Reexamination Certificate

active

07343958

ABSTRACT:
A garage door cable drum is disclosed for a sectional overhead door of a type having a substantially non-linear lift-weight to lift-height characteristic. The drum includes a generally spiral cable groove having a variable minor radius. The groove minor radius at any intermediate point along the groove is sized to provide a lift-cable moment arm that yields a corresponding cable lift force that is slightly less than an instantaneous lift weight of the garage door at any intermediate door elevation.

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