Patent ID: 9353570
Filing Date: 2016-05-31
CPC Classification: E06B

Claim Text:
1. A cordless retractable shade comprising: a rotatable roller; a shade material operably connected to the roller, wherein the shade material is wrappable about and unwrappable from the roller for retraction and extension of the shade material, respectively; a biasing component operably connected to the roller and configured to exert a variable biasing force on the roller in a retraction direction to at least counterbalance a weight of that portion of the shade material that is unwrapped from the roller, wherein the biasing component is configured to apply greater amounts of force to the roller as greater amounts of the shade material are unwrapped from the roller; a non-rotatable shaft positioned within the roller; and a nut mounted onto the non-rotatable shaft and keyed to the roller such that rotation of the roller translates the nut along a length of the non-rotatable shaft, wherein at an end point of travel of the shade material into an extended position, the nut engages a stop disposed on the non-rotatable shaft to restrict retraction of the shade material and wherein the nut is disengaged from the stop by movement of the roller in the retraction direction.