Progressive resistance lifting mechanism for a window covering
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United States of America Patent
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-
Feb 19, 2008
Grant Date -
N/A
app pub date -
Aug 3, 2004
filing date -
Aug 3, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A lifting mechanism is provided for a window covering which allows a bottom rail of the window covering to maintain a static position unless raised or lowered by a user. The lifting mechanism is included within either a top or bottom rail of the window covering. The lifting mechanism includes cords which pass from a rail including the lifting mechanism to a rail not including the lifting mechanism and about cord redirectors located within the rail including the lifting mechanism. The lifting mechanism includes spools and associated springs for gathering excess portions of the cord thereon. A progressive resister is coupled to the spools with the progressive resister providing different amounts of resistance to spool rotation depending on the amount of cord upon each spool.
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