Patent ID: 7093644
Filing Date: 2006-08-22
Classification: E06B

Abstract:
1. A window covering assembly comprising: a head rail; a bottom rail; a window covering between the head rail and the bottom rail; a pair of cords connecting the head rail, the bottom rail, and the window covering; a lifting mechanism associated with the bottom rail comprising: a main body; a pair of cord spools rotatably mounted on the main body, each of the cord spools connected to one of the pair of cords; a drum rotatably mounted on a central portion of the main body, the drum in rotatable engagement with the pair of cord spools; and a pair of coil springs connected to the drum, the coil springs each being biased to rotate the drum which rotates the cord spools to wind the each of cords onto one of the spools; and a locking mechanism to releasably secure the cords in position.