| 摘要 |
A window curtain assembly includes a foldable curtain have one end attached to a tubular mounting frame so that a handle on the other end of the curtain can be pulled to extend the curtain across the window. The curtain is retracted to a folded condition by a tension spring located within the tubular frame. A tractive tying line has two parallel runs extending along the curtain surface into the tubular frame. Segments of the line extend back and forth around a system of pulleys located within the frame. Two of the pulleys are connected to one end of the spring, so that the spring is able to draw the two pulleys along the frame. The tractive line is drawn into the tubular frame to move the curtain to its folded state.
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