Importance

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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 the opposite rail, about cord redirecting tension sensors along the cord. The lifting mechanism includes spools and associated springs for gathering excess portions of the cord. A progressive resister is coupled to the spools to provide different amounts of resistance to spool rotation depending on the amount of cord upon each spool. The tension sensors sense cord tension and lock the cord when only tension associated with gravity is sensed and release the cord when elevated or reduced tension associated with lifting or lowering the bottom rail is sensed.

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First Claim