SPRING BOX OF CORDLESS WINDOW COVERING AND FRICTION MECHANISM OF THE SAME
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United States of America Patent
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Issued Date -
Oct 19, 2017
app pub date -
Aug 31, 2016
filing date -
Apr 19, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
A spring box provided in one headrail of a window covering is disclosed, including a base, a post rotatably provided on the base to wind up a lifting cord, and a prestressing device which provides a pulling force to the post to rotate it in a predetermined direction. The spring box further includes a guiding member provided in the post to be rotated by the post, a movable member which moves along the guiding member in a non-rotating manner when the guiding member is rotated, and a friction member which is compressed and deformed to increase a friction between it and an inner wall of the post when the movable member is moved in a predetermined direction, providing a resistance effect to the rotation of the post, which makes one bottom rail of the window covering stay at a predetermined position.
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