Winding mechanism of blind

Abstract

A winding mechanism mounts at head rail of blind and includes lines each wrapped around a bottom stiffener strip and the head rail, a cord wound around cord reel and having at least one loop wrapped around a bight section of the line, a first drum coupled to the cord reel by gear, a second drum, and an S-shaped tape spring interconnected the first and second drums, the spring adapted to exert a force to support the drapery material. In a downward pulling of the stiffener strip the cord reel rotates to release each line and the cord with one worm section of the spring being further wound and the other worm section thereof being loosened for reaching a balance with the blind. An upward pulling of the same has an opposite effect. The drapery material is able to stay at any position in response to stopping the cord reel.

1 . A winding mechanism mountable at a groove of a head rail of a blind, the blind further including a bottom stiffener strip and a sheet of drapery material coupled between the head rail and the stiffener strip, comprising: 
 a cord reel provided on the head rail;    a line having one end tied off at a first position of the stiffener strip, passed one side of the sheet of drapery material, the head rail, and the other side of the sheet of drapery material, and having the other end tied off at a second position of the stiffener strip, the other end of the line formed as a bight section proximate the cord reel;    a cord wound around the cord reel and coupled to the bight section of the line;    a first drum rotated with the cord reel;    a second drum;    a tape spring interconnected the first drum and the second drum, the spring including two worm sections together formed an S, the spring adapted to exert a force to support the weight of the sheet of drapery material wherein in a downward pulling of the stiffener strip the cord reel rotates to release the line and the cord for lowering the sheet of drapery material with one worm section being further wound and the other worm section being loosened as a counterweight of the sheet of drapery material so as to reach a balance, thereby maintaining the sheet of drapery material at any one of a plurality of positions from a fully raised position to a fully lowered position in response to stopping the cord reel; and    a retaining member including an elongate seat engaged with a bottom surface of the stiffener strip, and two upwardly curved snapping edges along front end rear edges of the seat for clamping the stiffener strip;    wherein in an upward pulling of the stiffener strip the cord reel rotates in an opposite direction to wind the line and the cord for lifting the sheet of drapery material with one worm section being loosened and the other worm section being further wound as a counterweight of the sheet of drapery material so as to reach a balance, thereby maintaining the sheet of drapery material at any one of a plurality of positions from the fully raised position to the fully lowered position in response to stopping the cord reel.    
   
   
       2 . The winding mechanism of  claim 1 , wherein the cord reel comprises a first gear and the first drum comprises a second gear meshed with the first gear such that the cord reel and the first drum are adapted to rotate in opposite directions.  
   
   
       3 . The winding mechanism of  claim 1 , wherein the spring is adapted to control the cord reel.  
   
   
       4 . The winding mechanism of  claim 1 , further comprising a gear interconnected the first drum and the cord reel.  
   
   
       5 . The winding mechanism of  claim 1 , further comprising a plurality of spaced guide rollers disposed in the groove and two holes formed on a bottom of the groove, and wherein the guide rollers are coupled together by winding the cord therearound, and two ends of the cord are adapted to pass the holes.  
   
   
       6 . The winding mechanism of  claim 1 , wherein the line is wound in a direction opposite to that of each of the worm sections.  
   
   
       7 . The winding mechanism of  claim 1 , further comprising a case for receiving the cord reel, the first drum, and the second drum therein.  
   
   
       8 . A winding mechanism mountable at a groove of a head rail of a blind, the blind further including a bottom stiffener strip and a sheet of drapery material coupled between the head rail and the stiffener strip, comprising: 
 a cord reel provided on the head rail;    lines each having one end tied off at a first position of the stiffener strip, passed one side of the sheet of drapery material, the head rail, and the other side of the sheet of drapery material, and having the other end tied off at a second position of the stiffener strip, the other end of the line formed as a bight section proximate the cord reel;    a cord wound around the cord reel and having at least one loop wrapped around the bight section;    a first drum rotated with the cord reel;    a second drum; and    a tape spring interconnected the first drum and the second drum, the spring including two worm sections together formed an S, the spring adapted to exert a force to support the weight of the sheet of drapery material;    wherein in a downward pulling of the stiffener strip the cord reel rotates to release the lines and the cord for lowering the sheet of drapery material with one worm section being further wound and the other worm section being loosened as a counterweight of the sheet of drapery material so as to reach a balance, thereby maintaining the sheet of drapery material at any one of a plurality of positions from a fully raised position to a fully lowered position in response to stopping the cord reel; and in an upward pulling of the stiffener strip the cord reel rotates in an opposite direction to wind the lines and the cord for lifting the sheet of drapery material with one worm section being loosened and the other worm section being further wound as a counterweight of the sheet of drapery material so as to reach a balance, thereby maintaining the sheet of drapery material at any one of a plurality of positions from the fully raised position to the fully lowered position in response to stopping the cord reel.    
   
   
       9 . The winding mechanism of  claim 8 , further comprising a retaining member including an elongate seat engaged with a bottom surface of the stiffener strip, and two upwardly curved snapping edges along front end rear edges of the seat for clamping the stiffener strip.  
   
   
       10 . The winding mechanism of  claim 8 , wherein the cord reel comprises a first gear and the first drum comprises a second gear meshed with the first gear such that the cord reel and the first drum are adapted to rotate in opposite directions.  
   
   
       11 . The winding mechanism of  claim 8 , wherein the spring is adapted to control the cord reel.  
   
   
       12 . The winding mechanism of  claim 8 , further comprising a gear interconnected the first drum and the cord reel.  
   
   
       13 . The winding mechanism of  claim 8 , further comprising a plurality of spaced guide rollers disposed in the groove and holes formed on a bottom of the groove, and wherein the guide rollers are coupled together by winding the cord therearound, and two ends of the cord are adapted to pass the holes.  
   
   
       14 . The winding mechanism of  claim 8 , wherein each line is wound in a direction opposite to that of each of the worm sections.  
   
   
       15 . The winding mechanism of  claim 8 , further comprising a case for receiving the cord reel, the first drum, and the second drum therein.