Patent ID: 7287570

Claim:
A window covering assembly comprising: a head rail, said head rail having a first end and a second end; a bottom rail; at least one lift cord running through the head rail and the bottom rail; a window covering extending between the head rail and the bottom rail, said window covering operatively connected to the lift cord, and said window covering having a length extending between at least a portion of said first end and said second end; a lift system for raising and lowering said window covering, including an element that biases the bottom rail to move in an upward direction; a rotatable drive shaft operable to raise or lower the window covering upon rotation, said rotatable drive shaft extending a distance between said first end and said second that is at least as long as said length of said window covering; and a wrap spring operatively engaged with the lift system, the wrap spring configured to selectively prevent or permit raising and lowering of said window covering.