Winding mechanism of blind

Abstract

A winding mechanism mounts at a groove of a head rail of a blind and comprises a cord wrapped around a bottom stiffener strip and the head rail, a rope roller, a rope wound around the rope roller and coupled to the cord, a first roller coupled to the rope roller by gear, a second roller, and an S-shaped spring interconnected the first and second rollers, the spring adapted to exert a force to support the drapery material. In a downward pulling of the stiffener strip the rope roller rotates to release the rope 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 rope roller.

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 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;    a rope roller;    a rope wound around the rope roller and coupled to the cord;    a first roller rotated with the rope roller;    a second roller; and    a spring interconnected the first roller and the second roller, 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 rope roller rotates to release the rope 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 rope roller, and    in an upward pulling of the stiffener strip the rope roller rotates in an opposite direction to wind the rope 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 rope roller.    
   
   
       2 . The winding mechanism of  claim 1 , wherein the winding mechanism further comprises 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.  
   
   
       3 . The winding mechanism of  claim 1 , wherein the rope roller comprises a first gear and the first roller comprises a second gear meshed with the first gear such that the rope roller and the first roller are adapted to rotate in opposite directions.  
   
   
       4 . The winding mechanism of  claim 1 , further comprising a plurality of second rope rollers coupled to the spring.  
   
   
       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 rope is wound in a direction opposite to that of each of the worm sections.  
   
   
       7 . The winding mechanism of  claim 1 , comprising a case for receiving the rope roller, the first roller, and the second roller therein.