Novel cord retracting-releasing apparatus

Abstract

A novel cord retracting-releasing apparatus, including a conical reel set and a drive wheel set, where the conical reel set includes a first cone pulley and a second cone pulley that rotate co-axially, one end of a first pull cord is connected to a curtain retracting-releasing controller, the other end of the first pull cord is fastened to a large-head end of the first cone pulley, one end of a second pull cord is connected to a reel in the drive wheel set, and the other end of the second pull cord is fastened to a small-head end of the second cone pulley. The conical reel set is provided with two cone pulleys toward a same direction and automatically balance the force of the change in the arm of the pull cord on the cone pulley.

1 . A novel cord retracting-release apparatus, comprising a conical reel set and a drive wheel set, wherein the left end of the conical reel set is connected to a curtain retracting-releasing controller by using a first pull cord, and the right end of the conical reel set is connected to the drive wheel set by using a second pull cord;
 the conical reel set comprises a first cone pulley and a second cone pulley that configured to rotate co-axially towards a same direction, one end of the first pull cord is connected to the curtain retracting-releasing controller, the other end of the first pull cord is fastened to a large-head end of the first cone pulley, one end of the second pull cord is connected to a reel in the drive wheel set, the other end of the second pull cord is fastened to a small-head end of the second cone pulley, and a winding direction of the first pull cord on the first cone pulley is opposite to a winding direction of the second pull cord on the second cone pulley;   the conical reel set further comprises a fixed base and a rotation shaft, the rotation shaft penetrates through axis centers of the two cone pulleys, and the rotation shaft is detachably mounted on the fixed base by using an assembly member; and   the middle part of the assembly member is provided with a round hole, and the rotation shaft rotates in the round hole, the assembly member comprises a first assembly member and a second assembly member, a stopper is disposed at a side of a chute of each of the two assembly members, a hook is disposed at a bottom of each of the two assembly members, after the assembly member is slid to a right position in the assembly slot, the stopper abuts against a bump in the assembly slot, and the hook is snap-fastened to a bottom of the assembly slot.   
     
     
         2 . (canceled) 
     
     
         3 . (canceled) 
     
     
         4 . The novel cord retracting-releasing apparatus according to  claim 1 , wherein the fixed base is provided with an assembly slot, and the assembly member is slidably connected to the assembly slot through chutes at two sides. 
     
     
         5 . (canceled) 
     
     
         6 . The novel cord retracting-releasing apparatus according to  claim 1 , wherein a nut groove is disposed at the round hole of the first assembly member, a nut is fixed in the nut groove, an external thread section is disposed at one end of the rotation shaft, and the external thread section is connected to a thread of the nut. 
     
     
         7 . The novel cord retracting-releasing apparatus according to  claim 1 , wherein a small-head end of the first cone pulley and the small-head end of the second cone pulley are each provided with a knot hole, large-head ends thereof are each provided with a knot notch, and the knot hole and the knot notch are each used to fix a line end of a pull cord. 
     
     
         8 . The novel cord retracting-releasing apparatus according to  claim 1 , wherein the fixed base is provided with two wheel grooves configured for disposing a cone pulley, middle bottoms of the wheel grooves are each provided with a first fixed pulley, the first pull cord is wounded on one of the first fixed pulleys and then is wound on the first cone pulley, and the second pull cord is wound on the other of the first fixed pulleys and then is wound on the second cone pulley. 
     
     
         9 . The novel cord retracting-releasing apparatus according to  claim 8 , wherein bottoms at two ends of the fixed base are each provided with a second fixed pulley, and the first pull cord and the second pull cord are each wound on the second fixed pulley at a corresponding side. 
     
     
         10 . The novel cord retracting-releasing apparatus according to  claim 1 , wherein the drive wheel set comprises a reel, a winding wheel, and an unwinding wheel that are meshed sequentially, the reel is configured to wind an end of the second pull cord, the unwinding wheel is wound with a variable-force volute spring, and a winding direction of the second pull cord on the reel is the same as a winding direction of the variable-force volute spring on the winding wheel; and
 an end in the variable-force volute spring is fixed to the unwinding wheel, and an end outside the variable-force volute spring is fixedly connected to the winding wheel.