A mechanical device comprises a master wheel assembly, one or multiple slave wheel assemblies, a control rod, a shaft assembly, as well as multiple pairs of cord holders and cords. The master and slave wheel assemblies are connected by a shaft assembly and are mounted at front edge of a top slat of a Venetian blind. One end of the paired cords is tightened to master and slave wheel assemblies, and the other end is tightened to a user-selected slat that divides the blind into an upper and a lower region. Manipulating the control rod causes master and slave wheel assemblies to tilt slats in the lower region of the blind without interfering slats in the upper region. Combining with operation of slat-adjusting system of Venetian blinds, this device can selectively tilt slats in lower and upper regions of Venetian blinds for privacy and natural lighting adjustments.

A mechanical device comprises a master wheel assembly, one or multiple slave wheel assemblies, a control rod, a shaft assembly, as well as multiple pairs of cord holders and cords. The master and slave wheel assemblies are connected by a shaft assembly and are mounted at front edge of a top slat of a Venetian blind. One end of the paired cords is tightened to master and slave wheel assemblies, and the other end is tightened to a user-selected slat that divides the blind into an upper and a lower region. Manipulating the control rod causes master and slave wheel assemblies to tilt slats in the lower region of the blind without interfering slats in the upper region. Combining with operation of slat-adjusting system of Venetian blinds, this device can selectively tilt slats in lower and upper regions of Venetian blinds for privacy and natural lighting adjustments.

A venetian blind includes an upper beam, a lower beam, and multiple slats arranged between the upper and lower beams and each having a through hole and a slot communicating with the through hole. Two ladder tapes link the upper and lower beams and each have a first warp, a second warp, a plurality of wefts connected between the first and second warps and supporting the slats. One of the ladder tapes has a plurality of second ring portions passing through the through holes through the slots. A first lifting cord is provided adjacent to the first warp of one of the ladder tapes, and a second lifting cord is provided adjacent to the second warp of one of the ladder tapes and passes through the second ring portions of one of the ladder tapes. As such, the present invention is structurally simple and easy to be assembled.

A venetian blind includes an upper beam, a lower beam, and multiple slats arranged between the upper and lower beams and each having a through hole and a slot communicating with the through hole. Two ladder tapes link the upper and lower beams and each have a first warp, a second warp, a plurality of wefts connected between the first and second warps and supporting the slats. One of the ladder tapes has a plurality of second ring portions passing through the through holes through the slots. A first lifting cord is provided adjacent to the first warp of one of the ladder tapes, and a second lifting cord is provided adjacent to the second warp of one of the ladder tapes and passes through the second ring portions of one of the ladder tapes. As such, the present invention is structurally simple and easy to be assembled.

A blind is arranged such that minimal force is required to rotate the tilt drum to tilt the slats from the fully open to the fully closed position and back, with each of the front and rear tilt cables sharing the load nearly equally throughout the entire path from the fully open to the fully closed position and back.

A blind is arranged such that minimal force is required to rotate the tilt drum to tilt the slats from the fully open to the fully closed position and back, with each of the front and rear tilt cables sharing the load nearly equally throughout the entire path from the fully open to the fully closed position and back.

A venetian blind includes a headrail, a bottom rail, a first pull cord, and a second pull cord. Two ladder cords are provided between the headrail and the bottom rail. The ladder cords each have a first warp, a second warp, a plurality of wefts connected with the first and second wefts and supporting slats, and a plurality of first loops connected with the first warp. The slats each have a perforation passing through the top and bottom surfaces of the slat and penetrated by the first loop, and a recess provided at one of the inner and outer edges of the slat. At least one of the first pull cord, the second pull cord, the first warp, and the second warp is positioned in the recesses of the slats. As such, the venetian blind of the prevent invention can achieve an effect of automatic alignment of the slats.

A venetian blind includes a headrail, a bottom rail, a first pull cord, and a second pull cord. Two ladder cords are provided between the headrail and the bottom rail. The ladder cords each have a first warp, a second warp, a plurality of wefts connected with the first and second wefts and supporting slats, and a plurality of first loops connected with the first warp. The slats each have a perforation passing through the top and bottom surfaces of the slat and penetrated by the first loop, and a recess provided at one of the inner and outer edges of the slat. At least one of the first pull cord, the second pull cord, the first warp, and the second warp is positioned in the recesses of the slats. As such, the venetian blind of the prevent invention can achieve an effect of automatic alignment of the slats.

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.

The present disclosure describes roll-up coverings of custom length and/or width for architectural openings, and a method of assembling the same. The custom covering includes at least one outer elongate tape, at least one inner elongate tape, and a plurality of slats. The tapes preferably have lengths along central longitudinal axis extending between first ends and second ends of the tapes that are selected to correspond to the custom length of the covering. The slats are preferably transverse to, spaced apart along, and coupled to the tapes at any desired location along the tape lengths to achieve desired spacings of the slats, thereby providing a subassembly of custom length. The slats may have lengths extending between first ends and second ends of the slats, orthogonal to the central axis of the tapes, and selected to provide a custom width of the subassembly.