Foldable window blind

Abstract

A foldable window blind includes a cord-winding device, a foldable curtain suspended from the cord-winding device, two vertical rows of positioning members, and a counterweight device. The cord-winding device includes a rail, a spool unit, and two pull cords suspended from the rail and biased to be wound on the spool unit. Each of the positioning members is sleeved movably on a corresponding one of the pull cords, and is fastened to the curtain. The counterweight device is fastened to a lower end of the curtain, and is movable upwardly to an upper limit position so as to fold the curtain to form a plurality of curtain folds. When the counterweight member is disposed at the uppermost position, a lower end of the counterweight device is located below lower ends of the curtain folds.

1 . A foldable window blind comprising: 
 a cord-winding device including a rail, a spool unit disposed on said rail, and two spaced-apart pull cords suspended from said rail and biased to be wound on said spool unit;    a foldable curtain suspended from said cord-winding device and having an upper end fastened to said rail, said curtain being disposed in front of said pull cords;    a positioning unit including two symmetrical vertical rows of positioning members that are disposed behind said curtain and that are aligned respectively with said two pull cords, each row of said positioning members being arranged one above the other, each of said positioning members being sleeved movably on a corresponding one of said pull cords and being fastened to said curtain; and    a counterweight device including two vertical supporting rods spaced apart from each other along a horizontal direction and fastened to a lower end of said curtain, said supporting rods being interconnected fixedly, said counterweight device being movable upwardly relative to said rail to an upper limit position so as to fold said curtain to form a plurality of curtain folds in front of said counterweight device, each of said curtain folds being arranged one behind the other such that each of said positioning members is disposed between two adjacent ones of said curtain folds, said counterweight device having a lower end that is disposed below lower ends of said curtain folds when said counterweight device is disposed at said uppermost position.    
     
     
         2 . The foldable window blind as claimed in  claim 1 , wherein said curtain is made of a fabric, said foldable window blind further including a vertical row of spaced-apart horizontal suspended rods that are attached fixedly to said curtain.  
     
     
         3 . The foldable window blind as claimed in  claim 1 , wherein a position of each of said positioning members relative to said curtain is adjustable.  
     
     
         4 . The foldable window blind as claimed in  claim 3 , wherein each of said positioning members is generally S-shaped, and has a front half portion hooked removably on said curtain, and a rear half portion sleeved movably on the corresponding one of said pull cords.  
     
     
         5 . The foldable window blind as claimed in  claim 4 , wherein said curtain includes a vertical row of interconnected horizontally extending bamboo strips.  
     
     
         6 . The foldable window blind as claimed in  claim 1 , wherein each of said supporting rods has a plurality of holes formed therethrough that are arranged one above the other, said holes in one of said supporting rods being aligned respectively with said holes in the other of said supporting rods, a lowermost one of each vertical row of said positioning members extending into a selected one of said holes in a corresponding one of said supporting rods so as to allow for adjustment of a length of said curtain located under said lowermost one of each vertical row of said positioning members.  
     
     
         7 . The foldable window blind as claimed in  claim 1 , wherein said counterweight unit further includes a horizontal counterweight rod interconnecting fixedly lower ends of said supporting rods.  
     
     
         8 . The foldable window blind as claimed in  claim 7 , wherein said counterweight unit further includes a horizontal connecting rod interconnecting fixedly upper ends of said supporting rods, lower ends of said pull cords being fastened to said horizontal connecting rod.