Patent Publication Number: US-2018044979-A1

Title: Window curtain control device

Description:
BACKGROUND OF THE INVENTION 
     1. Fields of the Invention 
     The present invention relates to a window curtain control device, and more particularly, to a window curtain control device that is operated with less effort to control lifting or lowering movement of the window curtain. 
     2. Descriptions of Related Art 
     The conventional window curtain control devices are disclosed in U.S. Pat. No. 7,398,815 and U.S. Pat. No. 7,487,817. Both of the patents discloses a top box, a curtain and a bottom rail, wherein the curtain is located between the top box and the bottom rail, and the bottom rail is connected to the lower end of the curtain. A scrolling member and a fixed part are respectively located in the top box. A movable part is movably located between the fixed part and the scrolling member. The driving rope has one end fixed to the movable part and the other end extends through the top box. The tension rope has one end fixed to the fixed part, and the other end wraps around the fixed part and the movable part. When the bottom rail is pushed upward or pulled downward, the driving rope and the tension rope are cooperated to each other to lift or lower the curtain. 
     However, when the curtain is positioned at a higher position where the bottom rail is located at the higher position, the user may not easily hold the bottom rail and controls the curtain. Besides, the position that the curtain is moved cannot be precisely controlled by simply moving the bottom rail. 
     The present invention intends to provide a window curtain control device which has an operation portion extending from the driving rope which is easily operated, and the operation portion does not wrap children playing around. 
     SUMMARY OF THE INVENTION 
     The present invention relates to a window curtain control device and comprises a top box having a room therein, and a fixed part and a scrolling member are respectively positioned on two ends of the room. A curtain is connected to the top box, and a bottom rail is connected to the lower end of the curtain. A movable part is movably located between the fixed part and the scrolling member. A tension rope has one end fixed to the fixed part, and the other end of the tension rope wraps around the fixed part and the movable part. A driving rope has one end fixed to the movable part and the other end of the driving rope includes an operation portion which extends through the top box. The curtain is moved by operating the operation portion. 
     The advantages of the present invention are that the curtain is moved by operating the operation portion of the driving rope. 
     The operation portion is a hanging section of the driving rope which has simplified structure and does not wrap children. 
     The tension rope wraps around the movable part eight laps while the driving rope wraps around the movable part one lap, such that when the operation portion is moved one centimeter, the curtain moves eight centimeters. 
     The present invention will become more apparent from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows the top box of the curtain control device of the present invention; 
         FIG. 2  shows the fixed part, the movable part and the scrolling member in the top box of the curtain control device of the present invention; 
         FIG. 3  is a partial cross sectional view to show the curtain control device of the present invention installed to a window curtain, and 
         FIG. 4  shows that when the operation portion is pulled, the curtain lifts. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to  FIGS. 1 to 4 , the window curtain control device of the present invention comprises a top box  10 , and a curtain is connected to the top box  10 . A bottom rail  20  is connected to the lower end of the curtain. The top box  10  includes a room  12  defined therein. A fixed part  14  and a scrolling member  15  are respectively positioned on two ends of the room  12 . A movable part  13  is movably located between the fixed part  14  and the scrolling member  15 . 
     A tension rope  11  has one end fixed to the fixed part  14 , and the other end of the tension rope  11  wraps around the fixed part  14  and the movable part  13 , and extends through the top box  10  and connected to the bottom rail  20 . A driving rope  16  has one end fixed to the movable part  13  and the other end of the driving rope  16  extends through the top box  10  and comprises an operation portion  17  which is a section of the driving rope  16  and hangs below the top box  10 . The curtain is moved by operating the operation portion  17 . The operation portion  17  has a handle  18  connected to the distal end thereof. The tension rope  11  wraps around the movable part  13  eight laps while the driving rope  16  wraps around the movable part  13  one lap. 
     The users operates the operation portion  17  to control the movement of the curtain, and this is convenient for the users. 
     As shown in  FIGS. 1, 3 and 4 , the operation portion  17  is a section of the driving rope  16  and hangs below the top box  10 . The operation portion  17  is simple and does not wrap children playing around. 
     As shown in  FIG. 3 , when the users want to lower the curtain, the operation portion  17  is pushed upward, the tension of the operation portion  17  is loosened, and the movable part  13  moves toward the fixed part  14 . The tension rope  11  lowered, and the curtain and the bottom rail  20  are lowered due to gravity. 
     As shown in  FIG. 4 , when the users want to lift the curtain, the operation portion  17  is pulled downward, the movable part  13  moves away from the fixed part  14 , and the tension rope  11  is lifted to lift the curtain. 
     The handle  18  is designed for convenience of operation to the operation portion  17 . 
     The operation portion  17  has a handle  18  connected to the distal end thereof. The tension rope  11  wraps around the movable part  13  eight laps while the driving rope  16  wraps around the movable part  13  one lap. Therefore, when the operation portion  17  is moved one centimeter, the curtain moves eight centimeters. This saves effort of the users. 
     While we have shown and described the embodiment in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.