Disclosed herein is a window covering having adjustable securement mechanisms that are operable to secure at least a portion of the window covering at a certain location once the window covering has been manipulated. As described, the window covering includes a panel and at least one guide coupled to a first side of the panel. The window covering also includes at least one sliding securement mechanism coupled to the guide. The at least one sliding securement mechanism is operative to move along the guide and secure at least a portion of the panel at different positions along the guide.

A translatable roller shade system having: elongated first and second tracks positioned in parallel adjacent each other with the tracks each having a channel with a downward-facing slot extending along the track between the first and second ends of the roller shade system; and first and second roller shades each having a tube, a shade wrapped on the tube, first and second roller brackets that support the tube at each end of the tube, and a length adjuster that connects between the tube and at least one roller bracket to enable adjustment of the roller shade between a lowered and raised positions. The first and second roller shades are supported from above by the respective first and second tracks for translational movement relative to the tracks and each other such that the roller shades can be moved left or right along the tracks between fully overlapped and minimally overlapped positions.

Disclosed herein is a window covering having adjustable securement mechanisms that are operable to secure at least a portion of the window covering at a certain location once the window covering has been manipulated. As described, the window covering includes a panel and at least one guide coupled to a first side of the panel. The window covering also includes at least one sliding securement mechanism coupled to the guide. The at least one sliding securement mechanism is operative to move along the guide and secure at least a portion of the panel at different positions along the guide.

An electrostatically controllable optical device is provided, comprising: a transmissive substrate (101); a single transmissive electrode (102) arranged on a surface of said substrate; a transmissive dielectric layer (103) arranged on said electrode; and a flexible roll-up blind (104) attached to said dielectric layer, said flexible roll-up blind comprising a flexible electrode (106) and a flexible optically functional layer (105) provided on said flexible electrode, said flexible roll-up blind having naturally a rolled configuration and being capable of unrolling in a roll-out direction in response to an electrostatic force. At least one of said transmissive electrode, said transmissive dielectric layer, said flexible electrode and said flexible optically functional layer is adapted with respect to its shape, size, and/or position relative to another one of said transmissive electrode, said transmissive dielectric layer, said flexible electrode and said flexible optically functional layer, to allow partial unrolling but prevent complete unrolling of said flexible roll-up blind.

The electrostatically controllable optical device provides improved switching reliability, and is relatively simple to manufacture.

A buffering device capable of lower-limit position adjustment includes a fixed sleeve, a constricting spring, an adjustment ring, a sleeve base, and a lower-limit position defining base. An external force can be applied to the adjustment ring to push one of the two end portions of the constricting spring toward the other such that the constricting spring is elastically loosened and no longer tightly wound around the outer periphery of the fixed sleeve. The pushed end portion then sequentially pushes the sleeve base and the lower-limit position defining base in a rotating manner such that an inner tube of a roller blind is moved in an axial direction with respect to the lower-limit position defining base. By adjusting the distance between the lower-limit position defining base and an upper-limit position defining base along a threaded section of the inner tube, the lower-limit position of the roller blind can be adjusted.