A reeling device for a window covering is disclosed, including a base having a perforation, an end cap, and a rotating member engaged to the base. The rotating member is rotatable around an axis, and has a body portion having a first end and a second end. An end of the lifting cord is engaged to the body portion near the first end, while another end passes through the perforation and winds around the second end. The end cap is engaged to the first end and is rotatable, which includes a tapered sleeve and a tubular body fitting around the body portion to cover a cord segment engaged to the body portion; the tapered sleeve is connected to the tubular body, and an outer diameter thereof decreases in a direction away from the first end. Such structure is helpful to control a lifting cord to smoothly operate a shade material.

A covering for an architectural opening including a first rail, a second rail moveable relative to the first rail, a third rail moveable relative to the first rail, and a lift assembly coupled to the first rail. The lift assembly includes a first drum rotatable about a first axis, a second drum rotatable about a second axis; a first lift cord coupled between the first drum and the second rail, and a second lift cord coupled between the second drum and the third rail. The first drum is offset from the second drum, and a portion of the first drum overlaps a portion of the second drum along a third axis that is perpendicular to the first axis and the second axis.

A one-way driving mechanism for a cordless window blind essentially includes two volute spring gears, which are meshed with each other, and a volute spring connected between the volute spring gears. The volute spring gears each meshes with a cord gear. Each of the cord gears is connected with a cord, which is encircled with a single loop by a clutch wheel. Each clutch wheel is provided therein with a position-securing member.

A scrolling unit for electric blinds includes a top box. An electric motor and a scrolling unit are located in the top box. The electric motor includes a shaft, a plate extends axially from the shaft. The scrolling unit includes a rotary part, and the plate is inserted into a slit defined axially in the rotary part. Two ropes are spirally wrapped to the rotary part. Multiple frames are located in the top box and separate the ropes apart. The diameter of the shaft of the electric motor is different from the diameter of the rotary part. The ropes are spirally wrapped to the rotary part and do not tangle with each other.

A top-down bottom-up window covering includes a first beam and a second beam, which are sequentially provided below a fixture, and a covering material connecting the first beam and the second beam. A first lifting structure is installed in the first beam, and a second lifting structure is installed in the second beam. The first lifting structure is adapted to operate as the first beam is being controlled to move toward or away from the fixture, and the second lifting structure is adapted to operate as the second beam is being controlled to move toward or away from the fixture. Whereby, the top-down bottom-up window covering can be easily assembled and maintained.

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 curtain cord retracting and releasing device includes a reel for winding a cord, a power mechanism, and a transmission mechanism for transmission between the power mechanism and the reel to drive the reel to rotate to retract or release the cord. The transmission mechanism includes two meshed external gears with the same structure. A center distance of the external gears is a fixed value, and one external gear is connected to an output shaft of the power mechanism and the other is connected to the reel. The external gears are non-circular gears with a radius of curvature of a pitch line gradually increasing. A gear tooth corresponding to a node with a smallest radius of curvature on the pitch line and a gear tooth corresponding to a node with a largest radius of curvature on the pitch line are transitioned by a curved surface.

A driving mechanism for curtain cord winding reels includes a driving module, and first and second transition shafts mounted to two sides of the driving module. The driving module includes a base, a power member assembled in the base, and a middle shaft connected to the power member and mounted to two sides of the base. Two ends of the middle shaft extend out of the sides of the base and form a first shaft hole and a first axis. The first and second transition shafts are mounted to the ends of the middle shaft. An end of the first transition shaft connected to the middle shaft forms a second axis. An end of the second transition shaft connected to the middle shaft defines a second shaft hole. Cross sections of the first and second shaft holes, the first and second axes are matched with one another, and are non-circular.

An arrangement for securing an end cap onto a rail of a covering for an architectural opening includes an elongated rail extending in a longitudinal direction and an end cap having a slightly arcuate shape when at rest. At least one post projects inwardly from the end cap into the rail to contact a surface that is fixed relative to the rail to secure the end cap to the rail in a flattened condition. When the end cap is coupled the rail, the arcuate shape of the end cap is flattened out.

A window blind includes a headrail, a covering assembly including a plurality of slats and a bottom rail, a lifting mechanism including a driving module and a lift cord assembly operably connected to the driving module, a tilt mechanism adapted to drive the slats to rotate, and an auxiliary unit provided between the tilt mechanism and the lifting mechanism. The lift cord assembly is connected to the bottom rail for expanding or folding the covering assembly. The covering assembly is in a first state when each and every one of the slats is substantially parallel to each other and correspondingly rotatable by the tilt mechanism, and is in a second state otherwise. When the covering assembly is in the second state, the auxiliary unit is drivable by the tilt mechanism to make the lifting mechanism further release the lift cord assembly, changing the covering assembly into the first state again.