Window blind assembly

Abstract

A window blind assembly includes top and bottom fixing seats adapted to be fixed to a support and having a first engaging portion, a headrail, a bottom rail, and a blind unit. Each of the headrail and bottom rail includes a pair of first and second clamp plates having opposite inner faces, and protrusion-and-groove engagement surfaces formed on the inner faces. One of the first and second clamp plates further has a first retaining portion to engage the first engaging portion. The blind unit has top and bottom end portions. Each of the top and bottom end portions is clamped detachably between the inner faces and between the protrusion-and-groove engagement surfaces of one of the headrail and the bottom rail.

1 . A window blind assembly comprising:
 top and bottom fixing seats adapted to be fixed to a support, each of said top and bottom fixing seats having a base plate, and a first engaging portion projecting outwardly from said base plate;   a headrail and a bottom rail each including a pair of first and second clamp plates, said first and second clamp plates having opposite inner faces, and protrusion-and-groove engagement surfaces formed on said inner faces, one of said first and second clamp plates further having a first retaining portion to engage said first engaging portion; and   a blind unit made of a flexible material and having a top end portion, a bottom end portion, and an intermediate portion between said top and bottom end portions, each of said top and bottom end portions being clamped detachably between said inner faces and between said protrusion-and-groove engagement surfaces of one of said headrail and said bottom rail.   
     
     
         2 . The window blind assembly of  claim 1 , wherein said first engaging portion has a longitudinal first protrusion, and said first retaining portion has a longitudinal first groove to receive fittingly said first protrusion. 
     
     
         3 . The window blind assembly of  claim 2 , wherein said first protrusion includes two spaced-apart first spring plates that extend longitudinally to define a slot therebetween and that respectively have oppositely projecting butt ends, said first groove having a broad inner groove section and a narrow groove opening, said butt ends extending into said broad inner groove section through said narrow groove opening. 
     
     
         4 . The window blind assembly of  claim 1 , wherein said protrusion-and-groove engagement surfaces include two spaced-apart longitudinal second grooves formed on one of said inner faces, and two spaced-apart longitudinal second protrusions that project from the other one of said inner faces and that engage said second grooves, respectively. 
     
     
         5 . The window blind assembly of  claim 4 , wherein each of said second grooves has a broad inner groove section and a narrow groove opening, each of said second protrusions including two spaced-apart second spring plates that extend longitudinally to define a slot therebetween and that respectively have oppositely projecting butt ends, said butt ends of said second spring plates extending into said broad inner groove section of a respective one of said second grooves through said narrow groove opening of a corresponding one of said second grooves. 
     
     
         6 . The window blind assembly of  claim 1 , wherein said blind unit includes a plurality of elastic cords each having two opposite ends attached respectively to said top and bottom end portions and extending from said top end portion to said bottom end portion through said intermediate portion. 
     
     
         7 . The window blind assembly of  claim 6 , wherein said intermediate portion of said blind unit includes a plurality of folds each having a plurality of through holes for extension of said elastic cords therethrough. 
     
     
         8 . The window blind assembly of  claim 1 , wherein each of said headrail and said bottom rail further includes two end caps, each of which covers one of two opposite ends of said first clamp plate and one of two opposite ends of said second clamp plate.