Patent ID: 8863812

Claim:
A window blind assembly comprising: a securing seat including two sidewalls that are spaced apart from each other, and a bottom wall that interconnects said sidewalls and that cooperates with said sidewalls to define an accommodating space; a blind unit disposed below said bottom wall of said securing seat; at least one blind control device for bringing said blind unit to fold upwardly and unfold downwardly relative to said securing seat, and including a winding unit that is disposed in said accommodating space, and two cords, each of said cords being wound on said winding unit and having a linking segment that is coupled to said blind unit; and two cord guiding devices interposing said at least one blind control device; wherein each of said cord guiding devices includes a wheel holder mounted in said accommodating space of said securing seat, and at least one guiding wheel, said wheel holder including a resilient arm unit that resiliently abuts against said sidewalls of said securing seat so as to mount said wheel holder in said accommodating space, and two holder walls that are connected to said resilient arm unit and that are opposite to each other, each of said holder walls being formed with at least one engaging groove that has a substantially circular receiving portion and a constricted portion connected to said receiving portion, said constricted portion serving as an entrance to said engaging groove and having a dimension that is smaller than said receiving portion, said at least one guiding wheel including two axle portions, each of which extends in a front-to-rear direction and is rotatably received in said receiving portion of said at least one engaging groove in a corresponding one of said holder walls after passing through said constricted portion of said at least one engaging groove, and a cord winding portion which interconnects said axle portions and permits winding of said linking segment of a corresponding one of said cords thereon, a radial diameter of each of said axle portions being equal to a radial diameter of said receiving portion, and greater than a width of said constricted portion in a sideways direction perpendicular to the front-to-rear direction.