Overhead door lift system
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United States of America Patent
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-
Mar 18, 2008
Grant Date -
N/A
app pub date -
Apr 4, 2005
filing date -
Apr 4, 2005
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
First Claim
Family
International Classification(s)
Cited Art Landscape
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