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 window blind, wherein each ladder tape thereof includes two longitudinal cords, plural bearers and plural limiting members. The longitudinal cords each have an end connected to a deflecting mechanism disposed on the upper rail. The bearers are disposed between the two longitudinal cords for respectively supporting the slats. The limiting members include a first limiting member and a second limiting member neighboring thereto. The first limiting member has an end disposed on one of the longitudinal cords and includes a first slat-through portion located between two ends thereof passing through a first through hole of a first slat. A first linking loop is formed after the first slat-through portion passes through the first through hole. The second limiting member passes through the first linking loop for keeping the first through hole threaded through by one of the first limiting member and the second limiting member.

A window blind includes a headrail and a covering structure provided below the headrail. The covering structure includes multiple slats, which can be turned, lifted, and lowered. A driving module is immovably provided in the headrail and includes a power unit. A modulation assembly includes an adjustment member which is drivable to drive an adjustment cord assembly, turning the slats. A block and tackle system is provided in the headrail, and includes a movable member, which is drivable by the power unit to optionally reciprocate in a longitudinal direction of the headrail. A lifting cord assembly is connected to the block and tackle system, and extends out of the headrail to be fixedly connected to a bottom of the covering structure. When the movable member reciprocates in the longitudinal direction, the lifting cord assembly is driven to lift or lower the covering structure.

A curtain hanging assembly that consists of a curtain assembly able to effect horizontal opening and closing of curtains, and includes two elastic motor units provided with elastic feedback. Interactive dynamics between the two elastic motor units, through linear linkage, respectively cause torque forces produced to be in mutual opposition, enabling the let down area of the curtains to be naturally fixed at any height position.

In one or more arrangements, a power efficient remote control system is presented. The remote control system has a touch based interface having a plurality of touch sensitive sensors. The remote control system is configured to operate in an active mode in response to user input and operate in a background mode in response to inactivity. In the active mode, a control circuit of the remote control system is configured to monitor touch activity by sampling signals from outputs from a plurality of touch sensitive sensors individually. In the background mode, power is saved by electrically connecting outputs of the plurality of touch sensitive sensors together and monitoring touch activity by sampling a signal from the connected outputs of the plurality of touch sensitive sensors together.

A covering for an architecture opening has a horizontal movable rail supported by cords, with a variety of configurations which allow the movable rail to be moved up and down while concealing the cords.

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 panel includes a panel frame for pivotally supporting louvers. The panel frame includes two vertical planks, two transverse planks and four connectors. Each of the vertical planks includes two ends. Each of the transverse planks includes two ends. Each of the tracks is formed on a corresponding one of the vertical planks. Each of the connectors includes a vertical strip, a horizontal strip, two flank strips and two crooks. The vertical strip is connected to a corresponding one of the ends of a corresponding one of the transverse planks in a detachable manner. The horizontal strip is connected to a corresponding one of the ends of a corresponding one of the vertical planks in a detachable manner. The flank strips extend on two sides of the vertical strip. The crooks extend toward each other from the flank strips, and render the track smoothly movable toward horizontal strip between two flank strips.

An electric curtain includes an upper beam, two curtain ropes, a curtain body and a lower beam. The upper beam includes a rotating shaft, a pivotal member, two rope winders, a controller and a wireless control unit installed inside the controller. The wireless control unit has the technical feature of receiving and matching with a wireless transmission communication protocol originated from the external, thereby allowing the electric curtain to achieve the effect of establishing the most optimal electrical conduction and wireless communication transmission between the two based on the external wireless transmission communication protocol selected and matched.

An actuating system for a window shade includes a control module actuatable for adjusting a shading structure of the window shade. The control module includes a wand having a hollow interior, a flexible operating element extending outside the wand at a first end thereof, a handle coupled to the operating element and disposed at a second end of the wand, the handle being operable to pull the operating element for actuating the control module, and an anti-winding guard of an elongate shape, the operating element, the handle and the anti-winding guard being movable in unison relative to the wand. The anti-winding guard is configured to extend outside the wand between the handle and the second end of the wand when the handle moves away from the second end of the wand.