Window blind assembly with a releaseable curtain-drawing mechanism

Abstract

A window blind assembly includes a top rail, a drawable curtain, and a releasable curtain-drawing mechanism. The drawable curtain has an upper section hung from the top rail, and a lower section extending downwardly from the upper section. The releasable curtain-drawing mechanism includes a pull cord for drawing up and lowering the drawable curtain, and at least one connecting unit for connecting releasably the pull cord to the lower section of the drawable curtain. The connecting unit includes a first engaging component connected to the pull cord, a second engaging component connected to the lower section of the drawable curtain, and an engaging mechanism disposed on the first and second engaging components for providing an engagement force therebetween to interconnect releasably the first and second engaging components.

1 . A window blind assembly comprising:
 a top rail;   a drawable curtain that has an upper section hung from said top rail, and a lower section extending downwardly from said upper section; and   a releasable curtain-drawing mechanism including a pull cord for drawing up and lowering said drawable curtain, and at least one connecting unit for connecting releasably said pull cord to said lower section of said drawable curtain, said connecting unit including
 a first engaging component connected to said pull cord, 
 a second engaging component connected to said lower section of said drawable curtain, and 
 an engaging mechanism disposed on said first and second engaging components for providing an engagement force therebetween to interconnect releasably said first and second engaging components; 
   wherein the engagement force is sufficient to bear the weight of said drawable curtain so as to maintain connection between said first and second engaging components and thus between said pull cord and said lower section of said drawable curtain when said drawable curtain is lowered from said top rail; and   wherein said pull cord is released from said lower section of said drawable curtain when a pulling force that is sufficient to release said first engaging component from said second engaging component is applied to said pull cord while said drawable curtain is in a fully drawn up state.   
     
     
         2 . The window blind assembly as claimed in  claim 1 , wherein:
 said pull cord includes a pair of connecting sections disposed behind said drawable curtain and spaced apart from each other in a left-right direction; and   said curtain-drawing mechanism includes a pair of said connecting units, each of said connecting units connecting one of said connecting sections of said pull cord to said lower section of said drawable curtain.   
     
     
         3 . The window blind assembly as claimed in  claim 2 , wherein said engaging mechanism of each of said connecting units includes an annular recess part formed on one of said first and second engaging components, and an annular protrusion part formed on the other one of said first and second engaging components for engaging said annular recess part. 
     
     
         4 . The window blind assembly as claimed in  claim 3 , wherein, for each of said connecting units:
 said first engaging component includes a first base wall, a first surrounding wall extending from said first base wall, and a first hanging ring for coupling with a corresponding one of said connecting sections of said pull cord; and   said second engaging component includes a second base wall, a second surrounding wall extending from said second base wall and defining a space into which said first surrounding wall of said first engaging component extends, and a second hanging ring for coupling with said lower section of said drawable curtain.   
     
     
         5 . The window blind assembly as claimed in  claim 4 , wherein said first surrounding wall is formed with said annular protrusion, and said second surrounding wall has an inner wall surface formed with said annular recess part. 
     
     
         6 . The window blind assembly as claimed in  claim 4 , wherein:
 said first surrounding wall extends downwardly from said first base wall, and said first hanging ring is connected to said first base wall and projects upwardly therefrom; and   said second surrounding wall extends upwardly from said second base wall, and said second hanging ring is connected to said second base wall and projects downwardly therefrom.   
     
     
         7 . The window blind assembly as claimed in  claim 1 , wherein said engaging mechanism includes a resilient binding component for binding together said first and second engaging components. 
     
     
         8 . The window blind assembly as claimed in  claim 1 , wherein said engaging mechanism includes an annular recess part formed on one of said first and second engaging components, and an annular protrusion part formed on the other one of said first and second engaging components for engaging said annular recess part. 
     
     
         9 . The window blind assembly as claimed in  claim 8 , wherein said engaging mechanism further includes a resilient binding component for binding together said first and second engaging components. 
     
     
         10 . The window blind assembly as claimed in  claim 9 , wherein:
 said second engaging component defines a space into which said first engaging component extends, and is formed with a groove extending parallel to an axis of said second engaging component, and a plurality of annular positioning recesses that surround and are spaced apart along the axis of said second engaging component, and that are intersected by said groove; and   said resilient binding component is retained in a selected one of said annular positioning recesses.   
     
     
         11 . The window blind assembly as claimed in  claim 1 , wherein:
 said first engaging component includes a first base wall, a first surrounding wall extending from said first base wall, and a first hanging ring for coupling with said pull cord; and   said second engaging component includes a second base wall, a second surrounding wall extending from said second base wall and defining a space into which said first surrounding wall of said first engaging component extends, and a second hanging ring for coupling with said lower section of said drawable curtain.   
     
     
         12 . The window blind assembly as claimed in  claim 11 , wherein said engaging mechanism includes a resilient binding component for binding together said first and second engaging components. 
     
     
         13 . The window blind assembly as claimed in  claim 12 , wherein:
 said second surrounding wall is formed with a groove extending parallel to an axis of said second engaging component, and a plurality of annular positioning recesses that surround and are spaced apart along the axis of said second engaging component and that are intersected by said groove; and   said resilient binding component is retained in a selected one of said annular positioning recesses.