US 11,686,153 B2
Top-down bottom-up window covering
Lin Chen, Taichung (TW)
Assigned to Nien Made Enterprise Co., Ltd., Taichung (TW)
Filed by Nien Made Enterprise Co., Ltd., Taichung (TW)
Filed on May 11, 2021, as Appl. No. 17/317,874.
Claims priority of application No. 202023152965.2 (CN), filed on Dec. 24, 2020.
Prior Publication US 2022/0205320 A1, Jun. 30, 2022
Int. Cl. E06B 9/90 (2006.01); E06B 9/76 (2006.01)
CPC E06B 9/90 (2013.01) [E06B 9/76 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A top-down bottom-up window covering, comprising:
a headrail;
a middle rail, which is movably provided below the headrail;
a bottom rail, which is movably provided below the middle rail;
a covering structure provided between the middle rail and the bottom rail;
a first rotating shaft, which is provided at the headrail and is adapted to receive or release a first cord, wherein an end of the first cord is fixed at the middle rail;
a second rotating shaft, which is provided at the headrail and is adapted to receive or release a second cord, wherein an end of the second cord is fixed at the bottom rail;
a lifting control structure provided at the headrail and adapted to control the first rotating shaft or the second rotating shaft to rotate;
a pre-stress unit, which is provided at the headrail and is concurrently movable along with the first rotating shaft; and
a one-way clutch, which is located between the first rotating shaft and the lifting control structure;
wherein, when the middle rail is pulled upward by the first cord, the one-way clutch is in an engaged state for keeping a link between the first rotating shaft and the lifting control structure;
when the middle rail is not pushed and not pulled upward by the first cord, and the bottom rail is lifted, the one-way clutch is in the engaged state for keeping the link between the first rotating shaft and the lifting control structure;
when the middle rail is pushed upward, the one-way clutch is in a disengaged state for breaking the link between the first rotating shaft and the lifting control structure, and a driving force provided by the pre-stress unit drives the first rotating shaft to receive the first cord.