Active tension device for a window covering
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United States of America Patent
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Apr 26, 2011
Grant Date -
Aug 20, 2009
app pub date -
Feb 19, 2008
filing date -
Feb 19, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A tension device that prevents a window covering from operating properly until the tension device is installed. The tension device incorporates a drive wheel, casing, anchoring arm and drive stud. The drive stud has two sections, one keyed and one cylindrical. Before the tension device is installed, the keyed section of the drive stud engages the drive wheel and the casing, thereby preventing them from rotating relative to each other. When the tension device is installed, the drive stud must be inserted into the anchoring arm causing the keyed section of the drive stud to disengage the drive wheel and thereby allow the drive wheel to rotate relative to the casing.
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