A window covering is provided according to the present application, to achieve automatic extending or retracting of a window covering curtain. The window covering includes: a rotating shaft for extending and retracting control, a wound sheet spring and a cord winding box. The extending and retracting of the window covering curtain is achieved by winding the curtain pull cord via the cord winding box, and the force transmission between the wound sheet spring and the cord winding box is achieved by gear transmission. A spring wound sheet is provided inside the wound sheet spring. One proper wound sheet spring is chosen according to the weight of the window covering curtain to allow the window covering curtain to maintain a balance state of force without under the effect of an external force, to fix the extending or retracting state of the window covering curtain.

A window covering is provided according to the present application, to achieve automatic extending or retracting of a window covering curtain. The window covering includes: a rotating shaft for extending and retracting control, a wound sheet spring and a cord winding box. The extending and retracting of the window covering curtain is achieved by winding the curtain pull cord via the cord winding box, and the force transmission between the wound sheet spring and the cord winding box is achieved by gear transmission. A spring wound sheet is provided inside the wound sheet spring. One proper wound sheet spring is chosen according to the weight of the window covering curtain to allow the window covering curtain to maintain a balance state of force without under the effect of an external force, to fix the extending or retracting state of the window covering curtain.

In one aspect, a headrail assembly for a covering for an architectural structure includes a headrail and a tilt wand coupled to the headrail. The tilt wand includes a proximal end and a distal end spaced apart from the proximal end. The tilt wand is movable relative to the headrail between an operating position at which the tilt wand is suspended relative to the headrail at the proximal end of the tilt wand and a stowed position at which a portion of the tilt wand extending between the proximal and distal ends of the tilt wand is supported relative to the headrail. In addition, the headrail assembly includes a rail clip configured to couple the tilt wand to the headrail when the tilt wand is at the stowed position. The rail clip includes retention structure configured to retain the portion of the tilt wand relative to the headrail.

In one aspect, a headrail assembly for a covering for an architectural structure includes a headrail and a tilt wand coupled to the headrail. The tilt wand includes a proximal end and a distal end spaced apart from the proximal end. The tilt wand is movable relative to the headrail between an operating position at which the tilt wand is suspended relative to the headrail at the proximal end of the tilt wand and a stowed position at which a portion of the tilt wand extending between the proximal and distal ends of the tilt wand is supported relative to the headrail. In addition, the headrail assembly includes a rail clip configured to couple the tilt wand to the headrail when the tilt wand is at the stowed position. The rail clip includes retention structure configured to retain the portion of the tilt wand relative to the headrail.

A slat angle adjustment device for a window blind includes a casing, a transmission unit, and a driving rod. The casing has a flange inside. The transmission unit has a first worm shaft and a second worm shaft. The first and second worm shafts are rotatably disposed in the casing and meshed with each other. The driving rod has a flexible wing at an outer surface thereof. When assembled, the driving rod is inserted into the casing through a bottom hole of the casing. During the insertion of the driving rod, the flexible wing is compressed by the flange. Once the flexible wing passes through the flange, the flexible wing is restored and engaged with the flange. By this way, a consumer doesn't adjust repeatedly the assembly angle of the driving rod so as to reduce assembly time and increase assembly convenience.

A slat angle adjustment device for a window blind includes a casing, a transmission unit, and a driving rod. The casing has a flange inside. The transmission unit has a first worm shaft and a second worm shaft. The first and second worm shafts are rotatably disposed in the casing and meshed with each other. The driving rod has a flexible wing at an outer surface thereof. When assembled, the driving rod is inserted into the casing through a bottom hole of the casing. During the insertion of the driving rod, the flexible wing is compressed by the flange. Once the flexible wing passes through the flange, the flexible wing is restored and engaged with the flange. By this way, a consumer doesn't adjust repeatedly the assembly angle of the driving rod so as to reduce assembly time and increase assembly convenience.

A Venetian blind includes a plurality of slats arranged between a headrail and a bottom rail. Two rotary drums are disposed in two brackets mounted in the headrail and connected with each other through a transmission shaft. A first drawing member is connected with one rotary drum, and a second drawing member is connected with the other rotary drum. When the first drawing member is pulled downward, the rotary drums are rotated from a first position to a second position, such that the ladder cords are driven by the rotation of the rotary drums to tilt the slats to a closed position. When the second drawing member is pulled downward, the rotary drums are rotated from the second position to the first position, such that the ladder cords are driven by the rotation of the rotary drums to tilt the slats to an open position.

A Venetian blind includes a plurality of slats arranged between a headrail and a bottom rail. Two rotary drums are disposed in two brackets mounted in the headrail and connected with each other through a transmission shaft. A first drawing member is connected with one rotary drum, and a second drawing member is connected with the other rotary drum. When the first drawing member is pulled downward, the rotary drums are rotated from a first position to a second position, such that the ladder cords are driven by the rotation of the rotary drums to tilt the slats to a closed position. When the second drawing member is pulled downward, the rotary drums are rotated from the second position to the first position, such that the ladder cords are driven by the rotation of the rotary drums to tilt the slats to an open position.

A venetian blind includes a top frame receiving a coiling and uncoiling mechanism for folding and unfolding slats. An adjusting mechanism is mounted to the top frame for adjusting a tilt angle of each slat and includes two pivotal casing. Each of two ends of each pivotal casing includes two opposite outer sides to which two ladder strings are disposed, respectively. Each ladder string has a lower end extending through and secured to each slat. Two side strings are wound around the coiling and uncoiling mechanism. Each side string has a lower end extending through each slat and fixed to the bottommost slat. Each side string is hooked by an actuating member to extend through a spacing between two pegs parallel to an axial direction of each tube. Each actuating member interlocks with an associated pivotal casing to move in unison in a circumferential direction.

A slat angle adjusting mechanism for a window blind includes a shell, a worm gear rotatably disposed in the shell, and a rotationally driving unit rotatably disposed in the shell and including combinable first and second rotationally driving shafts. The first rotationally driving shaft is located in the shell and has a worm portion engaged with the worm gear, a cone-shaped abutting portion and an embedding portion with non-circular cross-section, which are connected with the worm portion in order. A top end of the second rotationally driving shaft is located in the shell and has an axial hole with non-circular cross-section and two opposite fastening portions each formed at a terminal end thereof with a hooking claw. As a result, the first and second rotationally driving shafts are combinable by the consumer, preventing themselves and the slats from damage during packaging and transportation.