The invention relates to an operating mechanism for a cordless window covering such as a roller blind, comprising at least one substantially stationary inner shaft which is connectable to the fixed world and at least one axially rotatable drive shaft configured for driving and thereby lowering and/or raising the window covering. The system is in particular configured to provide controlled operation of a cordless window covering.

The present discloses an automatically locked retractable protective door sill, including a retractable curtain assembly, a scroll assembly, an upper fixing base and a lower fixing base, a dial mechanism and a locking mechanism are arranged in the upper fixing base, the locking mechanism includes a hydraulic rod capable of retracting at a fixed time, and the hydraulic rod is connected to the dial mechanism; the sliding base is connected to the hydraulic rod, and the hydraulic rod drives the sliding base and drives the linkage base to reset automatically, so the automatic locking of the locking mechanism is achieved, and then the scroll assembly is locked. The whole device has a simpler structure and more convenient operation, the dial button may be manually pushed to return for locking after not reaching the set time, so as to prevent children opening the door sill during an automatic locking process.

The present invention relates to a device for preventing bending of a lower rotary rod and wrinkling of fabric in double blind without a string. More specifically, while a lower case is moved downwardly by the force of a handle portion (250) being pulled, a pair of rollers and a lower rotary rod are rotated. The rollers having a smaller diameter than the lower rotary rod prevent the lower rotary rod from rising and at the same time offset the load while rotating in close contact with double fabric (240), and thus prevent bending of the lower rotary rod or wrinkling of the fabric.

A roller blind assembly includes a blind roller, a clutch assembly that includes a bracket engagement member, and a pre-torsioned spring assembly that includes a spring. The pre-torsioned spring assembly is positioned in an interior cavity of the blind roller, and exerts a torque proportional to a preset torsion of the spring to promote rotation of the blind roller relative to the bracket engagement member. Rotation of the blind roller relative to the bracket engagement member in a first direction decreases torsion in the spring while rotation of the blind roller relative to the bracket engagement member in a second direction increases torsion in the spring. The pre-torsioned spring assembly is preferably selected from a group of at least two pre-torsioned spring assemblies, each spring assembly having a different spring preset torsion.

The present disclosure concerns a roller blind limiter assembly comprising a support-engaging member, a limit screw and a limit nut threadedly engaged therewith, operatively connectable to a roller blind tube and travelling along the screw upon extension and retraction of a blind, wherein, in use, the limit nut abuts a winding stopper of the limit screw when the blind reaches upper and/or lower end positions. The roller blind limiter assembly is configurable in a locked configuration wherein the limit screw is fixedly mountable to the roller blind support, and an unlocked configuration wherein the support-engaging member is pivotable about the longitudinal direction with respect to the limit screw. The present disclosure also concerns a roller blind mechanism and a roller blind system comprising such a limiter assembly, and a method for adjusting an end position of a roller blind.

A tensioner for use with an architectural-structure covering including an operating element (e.g., a cord, a chain, or the like) is disclosed. The tensioner selectively securing a position of the operating element relative to the tensioner. In one embodiment, the tensioner includes a body, a slider, a bearing, and an optional biasing member. The body may include a first body member coupled to a second body member. The slider is movably positioned within the body between first and second positions to selectively enable movement of the operating element relative to the tensioner. The bearing includes a projection for coupling to the second body member to prevent the second body member from being decoupled from the first body member. In this manner, when the bearing is enclosed within the body, a user cannot readily open the body (e.g., a user cannot readily separate the first and second body members).

An operating system for an architectural covering is provided. The operating system allows at least three modes of operation of an architectural covering. A transmission may be included between an input assembly and an output drive member, and the transmission may be selectively engaged to place the operating system into one of the at least three modes of operation. The operating system may include a first drive section including an input, a second drive section including an output, and a control mechanism arranged to selectively lock an element of the first and second drive sections to control movement of the output of the operating system upon actuation of the input. A shift lock is also disclosed herein. In use, the shift lock operates to restrict shifting operation of the operating system from one operating mode to another.

The invention refers to a Locking device (200) for a pre-tensioning arrangement of a roller blind (2) or a venetian blind, comprising a sleeve (5) and a plug element (4) adapted to be inserted into the sleeve (5), a locking member (7) and a pin (6). The pin is adapted to be operated between a locking position and a releasing position. When set to the locking position the plug element (4) is prevented from being rotated in view of the sleeve (5). When set to the releasing position the plug element (4) is allowed to be rotated in view of the sleeve (5).

Examples herein describe systems and methods for securing an opening and disorienting an active shooter. A command device can send a deployment command to a zone in a building. In response, canopies in the zone can deploy a roll-up door made of Kevlar that electromagnetically locks shut. The canopies can include blindingly bright lights and deafening sirens that disorient the shooter. The doors can block off rooms or other areas of a school where children can huddle safely until the shooter is apprehended. Canopies without doors can also be used at some openings to disorient the shooter.

A roller blind assembly includes a blind roller, a clutch assembly that includes a bracket engagement member, and a pre-torsioned spring assembly that includes a spring. The pre-torsioned spring assembly is positioned in an interior cavity of the blind roller, and exerts a torque proportional to a preset torsion of the spring to promote rotation of the blind roller relative to the bracket engagement member. Rotation of the blind roller relative to the bracket engagement member in a first direction decreases torsion in the spring while rotation of the blind roller relative to the bracket engagement member in a second direction increases torsion in the spring. The pre-torsioned spring assembly is preferably selected from a group of at least two pre-torsioned spring assemblies, each spring assembly having a different spring preset torsion.