초록 ▼

A roll-up shade is doubled and its ends suspended from a head rail that is mounted above a window. One end is attached to a roller tube and the other end is attached to a stationary tube, with a bight being formed between the tubes. A first sheet is defined from the bight to the roller tube and a se

A roll-up shade is doubled and its ends suspended from a head rail that is mounted above a window. One end is attached to a roller tube and the other end is attached to a stationary tube, with a bight being formed between the tubes. A first sheet is defined from the bight to the roller tube and a second sheet is defined from the bight to the stationary tube. A weighty rod is positioned in the bight to cause the bight to sag away from the head rail, and a shade guide surrounds the rod to guide the shade. With this structure, the roller tube can be rotated to pull up the first sheet and raise the bight or to lower the first sheet with bight, with the second sheet (i.e., the sheet that is directly attached to the stationary tube) remaining unmoving above the bight. The shade is patterned such that when the shade is raised and lowered, the relative motion between the two sheets causes the shade to alternatingly assume high and low opacity configurations. The roller tube can be motorized if desired.

대표청구항 ▼

[ What is claimed is:] [1.] A window covering, comprising:a roller tube;a holder;a shade having opposed first and second ends, the first end being engaged with the roller tube and the second end being engaged with the holder such that the shade forms a bight between its ends;a rod disposed in the bi

[ What is claimed is:] [1.] A window covering, comprising:a roller tube;a holder;a shade having opposed first and second ends, the first end being engaged with the roller tube and the second end being engaged with the holder such that the shade forms a bight between its ends;a rod disposed in the bight;a hollow shade guide forming a channel, the channel being open along a slit, the rod being parallel with the guide and being advanceable through the slit and disposed in the channel; anda lift mechanism coupled to the roller tube to selectively rotate the roller tube and thereby move the shade between a raised position, wherein the bight is closely juxtaposed with the holder, and a lowered position, wherein the bight is distanced from the holder.