Provided is a cord-penetrating component for use with a window shade having a top rail, a reeling unit and a cord. A bottom wall of the top rail has a through-hole penetrable by the cord. The reeling unit is disposed in the top rail and has a top plate and a bottom plate. A reeling wheel for reeling in the cord is disposed between the top and bottom plates. The cord-penetrating component is disposed on bottom wall of the top rail and protrudes from top side of the bottom wall. Ratio of vertical distance between bottom side of the top plate of the reeling unit and top side of the bottom plate of the reeling unit to vertical distance between top side of the cord-penetrating component and top side of the bottom wall of the top rail is 25:1. A window shade using the cord-penetrating component is further provided.

A controller assembly includes a housing, first and second tube units, and first and second runners. Each of the first and second runners slides on a respective one of the first and second tube units when the respective one of the first and second tube units is driven to rotate. In response to sliding of the first runner to bring the first runner into abutment with the second runner, the first runner is prevented from sliding over the second runner, whilst impeding rotation of the first tube unit. In response to sliding of the second runner to bring the second runner into abutment with the first runner, the second runner is prevented from sliding over the first runner, whilst impeding rotation of the second tube unit.

A winding assembly and a retractable curtain, which may adjust the tensile force of a cord. The winding assembly of the retractable curtain comprises a fixing seat and a winding shaft rotatably disposed on the fixing seat, wherein a threading hole and guiding holes are opened in the fixing seat for the cord to pass through successively; there is a plurality of guiding holes opened in different positions of the fixing seat, and the threading hole is located between the outer wall of the winding shaft and the plurality of guiding holes. The outer wall of the winding shaft tilts outward gradually along the axis thereof, and the threading hole is opened on a part of the fixing seat corresponding to one end of the winding shaft with a larger outer diameter.

A lift cord spool assembly may be used in a motorized window treatment. The lift cord spool assembly may include a spool, a housing, and an end cap. The spool may be configured to windingly receive a lift cord of the motorized window treatment. A diameter of the spool may taper by approximately 0.5 degrees from the first end to an opposed second end. The housing may be configured to surround the spool. The end cap may be configured to attach to the housing, for example, such that the spool is retained within the housing. The end cap may include an inner surface, a shoulder, an aperture, and a guide. The guide may be configured to push the lift cord onto the spool as the lift cord is wound onto the spool. The guide may define a gradual slope around a circumference of the shoulder.

A cord wrapping mechanism converts linear motion to circular motion for use in coverings for architectural openings. The cord is guided onto a spool.

A window covering in accordance with the invention includes a gearbox assembly comprising a controller incorporated into the gearbox, a motor incorporated into the gearbox, and an external sensor is provided to provide external inputs to the controller in the gearbox assembly. The external sensor may include a security sensor, a temperature sensor, a light sensor, an audio sensor, a smoke detector, a carbon monoxide detector, or a humidity sensor. The controller is further configured to relay sensor information to a remote HVAC system or security system.

A double-layer cord rolling device includes a driving unit, and a cord rolling unit disposed under the driving unit. The driving unit has an upper base, two torsion spring gears rotatably disposed in the upper base and engaged with each other, and a torsion spring connecting the two torsion spring gears. The cord rolling unit has a lower base connected with the upper base, two cord rolling wheels disposed in the lower base in a way that they are capable of rotating synchronously and coaxial with the torsion spring gears respectively, and two lift transmission cords connected to the two cord rolling wheels respectively. A transmission shaft is employed to connect a torsion spring gear and a corresponding one of the cord rolling wheels, enabling them to rotate synchronously.

A detachable cord rolling device includes a cord rolling unit and an auxiliary driving unit. The cord rolling unit has a first base where first and second torsion spring gears engaged with each other are disposed. A first torsion spring is disposed between the first and second torsion spring gears. The auxiliary driving unit has a second base where third and fourth torsion spring gears engaged with each other are disposed. The second base is detachably disposed on the first base of the cord rolling unit. The third torsion spring gear and the first torsion spring gear of the cord rolling unit are connected by a transmission shaft, thereby rotatable synchronously. As a result, the cord rolling unit of the invention can be used individually, or combined with the auxiliary driving unit by the transmission shaft for increasing the rolling force of the cord rolling unit.

A unidirectional wire take-up mechanism includes a fixing seat, a reel, a spindle, a unidirectional bearing, a bearing sleeve, a damping bounce member, and a positioning shaft. When the curtain is pulled down, the unidirectional bearing is locked, and the reel links the spindle through the bearing sleeve to rotate counterclockwise. When the spindle is rotated, the spindle and the damping bounce member generate a frictional force to form a damping effect, thereby providing a reaction force when the wire is released and offsetting part of the gravity of the curtain and effectively slowing down the speed and impact force when the curtain falls. When the curtain is rolled up, the reel links the bearing sleeve to rotate clockwise relative to the spindle, and the spindle and the damping bounce member have no relative movement, and the rotation has no resistance.

A retracting means comprises a synchronizing wheel group and transmission assemblies, the transmission assembly at each side being connected with a winding assembly; each transmission assembly comprises a first bevel gear and a second bevel gear which are engaged with each other, and the first bevel gear is connected with at least one synchronizing wheel; each winding assembly comprises a fixing seat, a winding shaft and a transmission shaft, the transmission shaft is connected with a corresponding second bevel gear, the winding shaft passes though and is coaxial with the transmission shaft, the outer wall of the winding shaft tilts outward gradually along the axis of the transmission shaft.