The present disclosure belongs to the field of spring roller shutters, and particularly relates to a spring roller shutter with adjustable function, which comprises a spring assembly in a drum, an adjusting assembly and a limiting assembly, wherein one end of the drum includes a concentric adjusting cylinder, the adjusting cylinder is connected with an output end of the spring assembly, one end of the adjusting cylinder away from the drum includes a fixed shell, the fixed shell includes a cavity with an opening facing the adjusting cylinder, the one end of the adjusting cylinder slides in the fixed shell, and the adjusting assembly and the limiting assembly are in the fixed shell, thereby achieving the benefit of adjusting the maximum withdrawal height of the curtain.

A roller shade comprising a roller tube, a shade material attached to the roller tube, and a shade drive unit adapted to rotate the roller tube to lower or raise the shade material. The shade drive unit comprises a spring adapted to counterbalance the shade drive unit, a spring carrier, and a spring fastener. The spring carrier comprises a cylindrical barrel, wherein one of the first and second ends of the spring is concentrically positioned over the cylindrical barrel of the spring carrier. The spring fastener comprising a body having a curved bottom surface adapted to be positioned over one of the first and second ends of the spring and attached to the cylindrical barrel of the spring carrier.

A roller shade comprising a roller tube, a shade material attached to the roller tube, and a shade drive unit adapted to rotate the roller tube to lower or raise the shade material. The shade drive unit comprises a spring adapted to counterbalance the shade drive unit, a spring carrier, and a spring fastener. The spring carrier comprises a cylindrical barrel, wherein one of the first and second ends of the spring is concentrically positioned over the cylindrical barrel of the spring carrier. The spring fastener comprising a body having a curved bottom surface adapted to be positioned over one of the first and second ends of the spring and attached to the cylindrical barrel of the spring carrier.

A kit of parts for assembling a control assembly for a roller blind includes a plurality of driven parts each having a tubular body with a different diameter and/or profile adapted to be inserted into and drivingly engage a respective roller blind tube. The kit further includes a plurality of mounting parts each having an outer face incorporating a different arrangement of securing formations adapted to be engageable with a respective mounting bracket, and a drive part including (i) a housing adapted to be coupled with any one of the mounting parts and (ii) a drive rotatingly mounted within the housing and adapted to be coupled with any one of the driven parts.

A curtain hanging assembly that consists of a curtain assembly able to effect horizontal opening and closing of curtains, and includes two elastic motor units provided with elastic feedback. Interactive dynamics between the two elastic motor units, through linear linkage, respectively cause torque forces produced to be in mutual opposition, enabling the let down area of the curtains to be naturally fixed at any height position.

A rotary positioning adjustment device and a curtain with the same are provided. The rotary positioning adjustment device includes a shaft sleeve (303) and a connecting rod (1). A reel (304) is fixedly connected with an end of the connecting rod (1); a fixed seat (305) is sleeved on the connecting rod (1); the reel (304) is arranged in the fixed seat (305); and a power storage assembly is installed in the shaft sleeve (303). The power storage assembly includes a power input piece (300), a second torsion spring (301) and a power output piece (302); a first support leg (315) of the second torsion spring (301) is connected in a hooked mode with one side of an input block (314) of the power input piece (300), and a second support leg (316) of the second torsion spring (301) is connected in a hooked mode with the other side of the input block (314). The rotary positioning adjustment device further includes a first torsion spring (310). The up and down adjustment and positioning of the curtain are achieved by the second torsion spring (301) and the first torsion spring (310), and the stability is high.

A rotary positioning adjustment device and a curtain with the same are provided. The rotary positioning adjustment device includes a shaft sleeve (303) and a connecting rod (1). A reel (304) is fixedly connected with an end of the connecting rod (1); a fixed seat (305) is sleeved on the connecting rod (1); the reel (304) is arranged in the fixed seat (305); and a power storage assembly is installed in the shaft sleeve (303). The power storage assembly includes a power input piece (300), a second torsion spring (301) and a power output piece (302); a first support leg (315) of the second torsion spring (301) is connected in a hooked mode with one side of an input block (314) of the power input piece (300), and a second support leg (316) of the second torsion spring (301) is connected in a hooked mode with the other side of the input block (314). The rotary positioning adjustment device further includes a first torsion spring (310). The up and down adjustment and positioning of the curtain are achieved by the second torsion spring (301) and the first torsion spring (310), and the stability is high.

A retractable door sill, including: a mounting base, the mounting base including an upper fixing base and a lower fixing base; a rotating drum, the rotating drum being arranged between the upper fixing base and the lower fixing base, a partition cloth, a torsion spring being configured to make the rotating drum rotate in one direction around its axis, the rotating drum wind up the partition cloth; and an adjusting device, the adjusting device comprising an adjusting rod and an adjusting mechanism, one end of the torsion spring being connected to the rotating drum, the other end of the torsion spring being connected to the adjusting rod of the adjusting device, the adjusting mechanism being configured to enable the adjusting rod to rotate unidirectionally around its own axis, and the adjusting rod being configured to change a torsional deformation of the torsion spring through its own rotation.

A retractable door sill, including: a mounting base, the mounting base including an upper fixing base and a lower fixing base; a rotating drum, the rotating drum being arranged between the upper fixing base and the lower fixing base, a partition cloth, a torsion spring being configured to make the rotating drum rotate in one direction around its axis, the rotating drum wind up the partition cloth; and an adjusting device, the adjusting device comprising an adjusting rod and an adjusting mechanism, one end of the torsion spring being connected to the rotating drum, the other end of the torsion spring being connected to the adjusting rod of the adjusting device, the adjusting mechanism being configured to enable the adjusting rod to rotate unidirectionally around its own axis, and the adjusting rod being configured to change a torsional deformation of the torsion spring through its own rotation.

A desired range of lift force to raise a window shade is used to select the window shade hardware such as, for example, the optimal LAM. A desired lift force may be 5 pounds for ADA compliance. However, if the user wants to exert less effort to lift the window shade, the user may request an increased lift force of 6 or 7 pounds. Therefore, if a lift force range between 3-8.5 pounds is desired, the system selects the optimal LAM to maintain and guarantee that the lift force required to operate the shades will not exceed the desired range of between 3-8.5 pounds.