Window Blind Assembly

Abstract

A blind assembly includes a head box, an axle, a lift lock, a blind, a tube set, a rod and an effort-saving unit. The axle is located in the head box. The lift lock is provided on the head box. The blind includes a bottom rail and at least one rope. The rope is inserted through the lift lock and tied to the bottom rail at an end. The tube set is connected to the head box. The rope is located in the tube set. The rod is inserted in the tube set. The effort-saving unit for connecting the rope to the rod so that the bottom rail is lifted as the rod is pulled.

1 . A blind assembly including
 a head box;   an axle located in the head box;   a lift lock located in the head box;   a blind including:
 a bottom rail; and 
 at least one rope inserted through the lift lock and tied to the bottom rail at an end; 
   a tube set connected to the head box;   a rod inserted in the tube set; and   an effort-saving unit for connecting the rope to the rod so that the bottom rail is lifted as the rod is pulled.   
     
     
         2 . The blind assembly in accordance with  claim 1 , wherein the tube set includes a first tube connected to the head box and a second tube connected to the first tube, wherein the rod extends beyond the second tube. 
     
     
         3 . The blind assembly in accordance with  claim 2 , wherein the effort-saving unit is located in the second tube. 
     
     
         4 . The blind assembly in accordance with  claim 3 , further including a cap fit in an end of the second tube and formed with an aperture through which the rod is inserted, thus avoid pivoting of the rod in the second tube. 
     
     
         5 . The blind assembly in accordance with  claim 3 , wherein the second tube includes a first shell and a second shell joined to the first shell so that the effort-saving unit is located in the second tube. 
     
     
         6 . The blind assembly in accordance with  claim 5 , wherein the first shell includes two ribs formed on an external side, wherein the second shell includes two grooves defined in an internal side for receiving the ribs, thus joining together the first and second shells. 
     
     
         7 . The blind assembly in accordance with  claim 5 , wherein each of the first and second shells includes a hook formed thereon, wherein the first tube includes two slots defined therein for receiving the hooks of the first and second shells, thus joining together the first and second tubes. 
     
     
         8 . The blind assembly in accordance with  claim 5 , wherein each of the first and second shells includes a lip formed thereon, wherein the lips of the first and second shells together form an annular structure for easy insertion into the first tube. 
     
     
         9 . The blind assembly in accordance with  claim 5 , wherein the effort-saving unit includes:
 a frame movably located in the second tube;   upper and lower movable pulleys supported on the frame; and   a belt sequentially wound on the lower movable pulley, and tied to the second tube at an end and tied to the rod at another end;   wherein the rope is wound on the upper movable pulley and tied to the head box at another end.   
     
     
         10 . The blind assembly in accordance with  claim 9 , wherein the effort-saving unit includes a stationary pulley secured to the second tube, wherein the belt is further wound on the stationary pulley. 
     
     
         11 . The blind assembly in accordance with  claim 10 , wherein the effort-saving unit includes another stationary pulley secured to the second tube, wherein the belt is sequentially wound on the stationary pulleys and the lower movable pulley. 
     
     
         12 . The blind assembly in accordance with  claim 10 , wherein the second shell includes a pin formed thereon for supporting the stationary pulley. 
     
     
         13 . The blind assembly in accordance with  claim 12 , further including a restraining element located against the stationary pulley, wherein the second shell includes two hooks formed thereon for hooking the restraining element. 
     
     
         14 . The blind assembly in accordance with  claim 1 , further including:
 a grip provided around the rod; and   a lock unit movable between a locking position for locking the grip to the rod and a releasing position for allowing movement of the grip along the rod.   
     
     
         15 . The blind assembly in accordance with  claim 14 , wherein the lock unit includes:
 a button provided on the grip; and   a lock including a first section pivotally connected to the grip and a second section abutted against the button so that the lock is moved to the releasing position from the locking position as the button is pushed.   
     
     
         16 . The blind assembly in accordance with  claim 15 , wherein the first section of the lock includes an aperture through which the rod is inserted, wherein the edge of the aperture is abutted against the rod when the lock is in the locking position. 
     
     
         17 . The blind assembly in accordance with  claim 15 , wherein lock unit includes a compression spring compressed between the first section of the lock and an internal portion of the grip so that the lock is biased toward the locking position by the compressed spring. 
     
     
         18 . The blind assembly in accordance with  claim 14 , wherein the lock unit includes a lock including a first section pivotally connected to the grip and a second section inserted through the grip so that the lock is moved to the releasing position from the locking position as the second section of the lock is pushed. 
     
     
         19 . The blind assembly in accordance with  claim 18 , wherein the first section of the lock includes an aperture through which the rod is inserted, wherein the edge of the aperture is abutted against the rod when the lock is in the locking position. 
     
     
         20 . The blind assembly in accordance with  claim 18 , wherein lock unit includes a compression spring compressed between the first section of the lock and an internal portion of the grip so that the lock is biased toward the locking position by the compressed spring.