A spring drive system for a cordless window shade includes multiple rotary drums respectively connected with suspension cords, and one or more springs respectively connected with the rotary drums. The rotary drums are operatively connected with each other, so that they can synchronously rotate to wind and unwind the suspension cords. Moreover, each of the rotary drums is connected with an end of one spring. The spring torque can act to sustain a bottom part of the window shade at any desired height, and drive rotation of the rotary drums to wind the suspension cords when the bottom rail is raised upward.

A spring box provided in one headrail of a window covering is disclosed, including a base, a post rotatably provided on the base to wind up a lifting cord, and a prestressing device which provides a pulling force to the post to rotate it in a predetermined direction. The spring box further includes a guiding member provided in the post to be rotated by the post, a movable member which moves along the guiding member in a non-rotating manner when the guiding member is rotated, and a friction member which is compressed and deformed to increase a friction between it and an inner wall of the post when the movable member is moved in a predetermined direction, providing a resistance effect to the rotation of the post, which makes one bottom rail of the window covering stay at a predetermined position.

An unequal-torque coil spring and a spring motor thereof which is adapted for a curtain set that can automatically fold back a curtain; the same provides a feedback torque that responds to different stages of a curtain-folding working process and generates various corresponding torque in response, as each of the different stages requires a different force. Consequently, the curtain can be folded back at a steady speed, and positionally fixed at any height when the curtain is lowered.

A power generating blind assembly for harnessing solar energy passing through a window includes a set of window blinds for mounting in a window. The set of window blinds includes an upper housing, a lower member and a plurality of slats. A plurality of solar cells is each positioned on a respective one of the slats to be exposed to sunlight passing through the window. An adjustment unit is integrated into the set of window blinds and the adjustment unit adjusts an angle of the plurality of slats. In this way the adjustment unit facilitates the plurality of solar cells to capture the maximum amount of solar energy.

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.

In an embodiment, a system for managing window blinds is provided. The system comprises an electronic device and an application stored on the device that when executed directs, based on a stored schedule, blinds for a first group of windows in a room in a structure to execute a first action. The system also directs, based on the schedule, blinds for a second group of windows in the room to execute a second action. The system also directs, based on the schedule, blinds for the first and second groups to take a third action. The actions comprise at least one of opening slats, closing slats, opening the blinds, and closing the blinds. The application transmits the directions to the groups via at least one of Internet connection, WiFi connection, and other wireless connections via an intermediary device and via Bluetooth and transmits via Bluetooth without intermediary device.

A control device of a cordless blinds assembly includes a bottom box and a rod unit which is received in the bottom box. The rod unit is cooperated with the operation unit in the bottom box. The operation unit is cooperated with a pawl which is engaged with or disengaged from a gear of the coil spring plate seat so as to control the operation of the blinds assembly without using any operation cord.

A cordless curtain is provided according to the present application, to simplify the way of winding a traction cord. The technical solution of a cordless curtain according to an embodiment of the present application includes a stretchable component, a movable guide-line sliding assembly, a guide-line fixing seat assembly and a traction cord. One end of the stretchable component is fixed, and another end of the stretchable component is connected to the guide-line sliding assembly; the position of the guide-line fixing seat assembly is fixed and the guide-line fixing seat assembly is connected to the guide-line sliding assembly via the traction cord.

A window shade includes a top box, a mediate bar, a bottom bar and a shade connected between the mediate bar and the bottom bar. A first scrolling unit and a second scrolling unit are located in the top box, and each are cooperated with a movable unit, a resilient member and a fixed member. The resilient member is connected between the movable unit and the fixed member. Each of the first scrolling unit and the second scrolling unit has a first roller and a second roller, and each of the movable unit has a third roller and a fourth roller. The first cords of the first scrolling unit are connected to the mediate bar. The second cords of the second scrolling unit extend through the mediate bar and are connected to the bottom bar. The first and second cords meet the requirements of a longer shade.

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.