A ladder tape device for a venetian blind includes a U-shaped fixing base fixed in a head rail of the venetian blind, a ladder tape retainer with opposite ends placed on corresponding two side-panels of the fixing base, a plurality of ladder tapes with a top end of each ladder tape passing through the fixing base and being wound on the ladder tape retainer, and a limiting cover buckled on the top end of the fixing base, an inner wall of the limiting cover and an outer wall of the top end of the ladder tape retainer are separated by a predetermined distance to form a ladder tape limiting space.

The present invention relates to a blind blade assembly for solar photovoltaic power generation including solar cells installed on one side thereof to enable solar photovoltaic power generation. In the blind blade assembly of the present invention, solar cells are provided in a prefabricated form, allowing the solar cells to be replaced and repaired individually. The blind blade assembly for solar photovoltaic power generation according to the present invention includes a blade frame 210 provided with a mounting groove 211; a plurality of solar cell panels 220 disposed in the longitudinal direction in the mounting groove 211; and fixing members 230 for connecting electrodes 223 between the solar cell panels 220 and for fixing seams.

The present invention relates to a biconical variable force transmission self-balancing lifting curtain, including a plurality of curtain sheets, a bottom rail, a traction rope, a lifting control piece and a variable force output structure, wherein the variable force output structure includes a first pull rope, a second pull rope, a variable force spring, a first conical reel and a second conical reel. Through the variable force spring in the variable force output structure, in the ascending process of the lifting curtain, a gradually-increased elastic force is provided; and further, two biconical reels are utilized, whereby the relationship of force arms at two ends is changed, and the elastic force of the variable force spring is amplified enough to balance the gradually-increased tensile force of the traction rope on the lifting control piece.

The present invention relates to a biconical variable force transmission self-balancing lifting curtain, including a plurality of curtain sheets, a bottom rail, a traction rope, a lifting control piece and a variable force output structure, wherein the variable force output structure includes a first pull rope, a second pull rope, a variable force spring, a first conical reel and a second conical reel. Through the variable force spring in the variable force output structure, in the ascending process of the lifting curtain, a gradually-increased elastic force is provided; and further, two biconical reels are utilized, whereby the relationship of force arms at two ends is changed, and the elastic force of the variable force spring is amplified enough to balance the gradually-increased tensile force of the traction rope on the lifting control piece.

A follower arrangement, operatively coupled to a plurality of slats of a blind assembly via a flexible cord, for raising and lowering the plurality of slats via the flexible cord, may include a housing defining a first opening therethrough, a ferromagnetic or paramagnetic counterweight to act against a weight of the plurality of slats of the blind assembly to reduce forces required to be applied to the follower arrangement to raise or lower the slats, and at least one magnet received within the first opening defined through the housing and magnetically attached to the counterweight to magnetically secure the housing to the counterweight.

A motorized window blind includes a top rail, a bottom rail, a plurality of slats assembled between the top rail and the bottom rail, and a control device received in the bottom rail so as to control movement of the slats. The control device includes a transmission unit, a motor, a first cord, a second cord and a power supply. The power supply provides electric power to the motor which is connected to the transmission unit. The first and second cords are respectively connected to the transmission unit, and extend through the slats, and are connected to the top rail. The transmission unit is driven by the motor to lift and lower the slats. The control device includes a detection unit and an angle detection member. The slats are lowered when the detection unit detects the power supply is low. The angle detection member angularly controls the salts status.

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.

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.

A box for a system for opening and closing a communication route between two separate areas, the system including separation means suitable for allowing and preventing, respectively, at least partially, crossing of the route by light, may include: a box body configured to accommodate a movement unit of the system; and support elements for the movement unit. The box body may have a major extension direction. The box body may be defined by support and closing profiles, both extending along the direction. The support profile may define at least one upper, lower, and connecting wall. The closing profile may define a closing wall. The closing profile may be removably fixable to the support profile for closing the box body. When the closing profile is fixed to the support profile, a distance between the closing wall and the connecting wall may be less than or equal to 20 millimeters.

A box for a system for opening and closing a communication route between two separate areas, the system including separation means suitable for allowing and preventing, respectively, at least partially, crossing of the route by light, may include: a box body configured to accommodate a movement unit of the system; and support elements for the movement unit. The box body may have a major extension direction. The box body may be defined by support and closing profiles, both extending along the direction. The support profile may define at least one upper, lower, and connecting wall. The closing profile may define a closing wall. The closing profile may be removably fixable to the support profile for closing the box body. When the closing profile is fixed to the support profile, a distance between the closing wall and the connecting wall may be less than or equal to 20 millimeters.