The present invention provides an under-structure of a blind apparatus. An under-structure of a blind apparatus according to an embodiment of the present invention includes: a first bar that holds the lower end of a screen; a plug that is coupled to an end of the first bar and has a first through-hole at the center; a second bar that receives the first bar and has a slit through which the screen comes out; a cover that is fixed to an end of the second bar and has a second through-hole communicating with the first through-hole; and a wrench plug that is coupled to the outside of the cover and is fitted in the first through-hole through the second through-hole to transmit torque.

The present invention provides an under-structure of a blind apparatus. An under-structure of a blind apparatus according to an embodiment of the present invention includes: a first bar that holds the lower end of a screen; a plug that is coupled to an end of the first bar and has a first through-hole at the center; a second bar that receives the first bar and has a slit through which the screen comes out; a cover that is fixed to an end of the second bar and has a second through-hole communicating with the first through-hole; and a wrench plug that is coupled to the outside of the cover and is fitted in the first through-hole through the second through-hole to transmit torque.

In one aspect, a roller shade assembly for an architectural opening may generally include a first roller, a second roller and a looped shade extending around the first and second rollers, The looped shade may include at least one outer shade web forming a continuous loop around the rollers. In addition, the roller shade assembly may include an inner shade web configured to be wrapped around the first roller or the second roller such that the inner shade web is positioned within the continuous loop. The inner shade web may be coupled to the outer shade web(s) at a location along an inner perimeter of the continuous loop. Additionally, rotation of the first roller and/or the second roller in an unwinding direction may result in the inner shade web being unwound from the first roller or the second roller along the inner perimeter of the continuous loop.

In one aspect, a roller shade assembly for an architectural opening may generally include a first roller, a second roller and a looped shade extending around the first and second rollers, The looped shade may include at least one outer shade web forming a continuous loop around the rollers. In addition, the roller shade assembly may include an inner shade web configured to be wrapped around the first roller or the second roller such that the inner shade web is positioned within the continuous loop. The inner shade web may be coupled to the outer shade web(s) at a location along an inner perimeter of the continuous loop. Additionally, rotation of the first roller and/or the second roller in an unwinding direction may result in the inner shade web being unwound from the first roller or the second roller along the inner perimeter of the continuous loop.

A window covering can be configured to facilitate height adjustment of window covering material. In some embodiments, a wand may be utilized to help control adjustment of the position of the window covering material. For instance, in some embodiments a roller may be rotated via use of a wand to effect adjustment of the window covering material.

A window covering can be configured as roll-up shade. The window covering can have a plurality of clips that are configured to be moveable from a first position in which the clips engage window covering material and a second position at which the clips do not engage the window covering material. When the clips are in the second position, the window covering material is manually adjustable from between a fully extended position to a retracted position. When the window covering material is moved to a retracted position, the lower portion of the window covering material may be rolled up upon height adjustment to form a roll of the window covering material. After the adjustment of the window covering material, the clips can be moved to their first position to engage the unrolled material to maintain a position of the rolled up material.

A window covering can be configured as roll-up shade. The window covering can have a plurality of clips that are configured to be moveable from a first position in which the clips engage window covering material and a second position at which the clips do not engage the window covering material. When the clips are in the second position, the window covering material is manually adjustable from between a fully extended position to a retracted position. When the window covering material is moved to a retracted position, the lower portion of the window covering material may be rolled up upon height adjustment to form a roll of the window covering material. After the adjustment of the window covering material, the clips can be moved to their first position to engage the unrolled material to maintain a position of the rolled up material.

A retractable curtain system is provided and includes a curtain support system, a curtain, and a retraction system. The curtain support system includes a pair of outer walls and an upper frame to provide a curtain receiving space. The curtain covers the curtain receiving space and includes a first non-transparent panel and transparent panel connected to the first non-transparent panel. The retraction system is connected to the curtain to lower and raise the transparent panel.

A retractable curtain system is provided and includes a curtain support system, a curtain, and a retraction system. The curtain support system includes a pair of outer walls and an upper frame to provide a curtain receiving space. The curtain covers the curtain receiving space and includes a first non-transparent panel and transparent panel connected to the first non-transparent panel. The retraction system is connected to the curtain to lower and raise the transparent panel.

A retractable window covering for natural illumination of building interiors by redirecting the incident daylight at angles that promote its deeper penetration into the interior space. The window covering comprises an optically transmissive, flexible polymeric sheet having reflective surfaces incorporated into its material and configured to redirect at least a portion of light propagating through the sheet towards a desired direction. The window covering is operable from a closed to an open position so as to increase or decrease the amount of redirected and/or admitted light.