Patent ID: 7546866
Filing Date: 2009-06-16
Classification: E06B

Abstract:
1. A window blind assembly comprising: a headrail having a longitudinal axis; a bottom rail suspended below said headrail; a window covering material extending between said headrail and said bottom rail, said window covering material having an upper end attached to said headrail and a lower end attached to said bottom rail; a traversable tube mounted in said headrail, said tube having first and second ends and extending in a direction substantially parallel to the longitudinal axis of said headrail; a threaded support rod secured to said headrail adjacent the first end of said tube, said threaded support rod being threadably coupled with the first end of said tube for providing traversing motion to said tube along the longitudinal axis of said headrail; and a spring motor secured to said headrail adjacent the second end of said tube, said spring motor including: drive gears in communication with the second end of said tube for selectively rotating said tube; a storage drum; an output drum; an elongated spring connected to said storage and output drums, wherein said storage and output drums rotate along respective axes that are substantially parallel to the longitudinal axis of said headrail; a first power plate having first and second circular openings; and a second power plate having first and second openings, said first and second power plates having opposing posts for assembling said first and second power plates together so that the respective first openings of said assembled power plates are aligned with one another and the respective second openings of said assembled power plates are aligned with one another, wherein said storage drum has bearing surfaces on opposite ends thereof engagable with the first openings of said assembled power plates for supporting rotation of said storage drum, said output drum has bearing surfaces on opposite ends thereof engagable with the second openings of said assembled power plates for supporting rotation of said output drum, and said first power plate has an exterior surface including a stub shaft and said output drum includes one of the drive gears integrally formed therewith, the one of the drive gears passing through the second opening of said first power plate.