A shielding device for opening and closing a shielding member by rotation of a winding shaft, the shielding device including a speed controller configured to control an automatic movement speed of the shielding member, wherein the speed controller includes: a housing containing a viscous fluid; and a moving member contained in the housing and configured to move by rotation of the winding shaft, and the speed controller is configured so that resistance the moving member receives from the viscous fluid varies with movement of the moving member, is provided.

A shielding device for opening and closing a shielding member by rotation of a winding shaft, the shielding device including a speed controller configured to control an automatic movement speed of the shielding member, wherein the speed controller includes: a housing containing a viscous fluid; and a moving member contained in the housing and configured to move by rotation of the winding shaft, and the speed controller is configured so that resistance the moving member receives from the viscous fluid varies with movement of the moving member, is provided.

A ladder strap structure installable on high/low rail includes two vertical straps, multiple horizontal straps and a polygonal control drum. Multiple perforations are formed on the vertical straps at equal intervals. A securing bolt is passed through the perforations of the vertical straps to secure the ladder strap on the polygonal control drum. By means of selecting the perforations positioned at different heights, the ladder strap can be secured on the polygonal control drum according to the height of the high/low blind rails so that the application range of the ladder strap is widened.

A ladder strap structure installable on high/low rail includes two vertical straps, multiple horizontal straps and a polygonal control drum. Multiple perforations are formed on the vertical straps at equal intervals. A securing bolt is passed through the perforations of the vertical straps to secure the ladder strap on the polygonal control drum. By means of selecting the perforations positioned at different heights, the ladder strap can be secured on the polygonal control drum according to the height of the high/low blind rails so that the application range of the ladder strap is widened.

A skew adjustment mechanism is used for adjusting the length of a lift cord on a window covering. The lift cord extends from a lift spool at a first end to an anchor drum at a second end. A cord wrap post is provided between the lift spool and the anchor drum so that the lift cord can be wrapped around the cord wrap post to provide friction between the lift cord and the cord wrap post when the lift cord is taut in order to reduce the amount of holding force that is needed to prevent the anchor drum from rotating.

A skew adjustment mechanism is used for adjusting the length of a lift cord on a window covering. The lift cord extends from a lift spool at a first end to an anchor drum at a second end. A cord wrap post is provided between the lift spool and the anchor drum so that the lift cord can be wrapped around the cord wrap post to provide friction between the lift cord and the cord wrap post when the lift cord is taut in order to reduce the amount of holding force that is needed to prevent the anchor drum from rotating.

A tilt mechanism for a blind includes a spool, two transmission shafts, two transmission sleeves and a driven shaft. The spool has an inner gear. Each transmission shaft has an assembling portion and a gear. The gears are engaged with the inner gear. The transmission sleeves are respectively engaged with the assembling portions of the transmission shafts, and each transmission sleeve has an outer surface and a worm gear located at the outer surface thereof. The driven shaft has a teeth portion, and the teeth portion is engaged with the worm gear. The transmission shafts and the transmission sleeves are simultaneously rotatable by being driven by the spool, and the driven shaft is rotatable between a start position and a stop position along an operating direction by being driven by the transmission sleeves.

A tilt mechanism for a blind includes a spool, two transmission shafts, two transmission sleeves and a driven shaft. The spool has an inner gear. Each transmission shaft has an assembling portion and a gear. The gears are engaged with the inner gear. The transmission sleeves are respectively engaged with the assembling portions of the transmission shafts, and each transmission sleeve has an outer surface and a worm gear located at the outer surface thereof. The driven shaft has a teeth portion, and the teeth portion is engaged with the worm gear. The transmission shafts and the transmission sleeves are simultaneously rotatable by being driven by the spool, and the driven shaft is rotatable between a start position and a stop position along an operating direction by being driven by the transmission sleeves.

A horizontal blind includes a fixing frame, more than one slat control unit and more than one cord winding unit. The fixing frame is mounted on an upper side of a window. The bottom section of the fixing frame has a connection face for connecting with the slat control unit. The slat control unit includes a fixing seat securely connected with the bottom section of the fixing frame and a controlling polygonal barrel received in the fixing seat. The controlling polygonal barrel is connected with a ladder belt to control the rotation of the slats into a horizontal state or a vertical state to shade the sunlight. The cord winding unit is disposed under the fixing seat, including a cord restriction seat, a cord reel passing through the cord restriction seat and a movable conic tube movably fitted on the cord reel for winding the pull cord thereon.

A skew adjustment mechanism is used for adjusting the length of a lift cord on a window covering. The lift cord extends from a lift spool at a first end to an anchor drum at a second end. A cord wrap post is provided between the lift spool and the anchor drum so that the lift cord can be wrapped around the cord wrap post to provide friction between the lift cord and the cord wrap post when the lift cord is taut in order to reduce the amount of holding force that is needed to prevent the anchor drum from rotating.