Balanced window blind having a spring motor for concealed...

Details Balanced window blind having a spring motor for concealed... Balanced window blind having a spring motor for concealed...

E - Fixed Constructions

06

B

E06B 9/32 (2006.01) E06B 9/322 (2006.01)

Patent

CA 2424195

A window blind includes a head rail, a bottom rail, and an expandable window covering. A pair of pull cords interconnect the head rail, the bottom rail and the expandable window covering. A spring motor includes a drive drum, a pair of cord spools, a spiral spring, and a friction imposing mechanism. The drive drum is mounted rotatably on the head rail. Each of the cord spools is mounted to rotate with and is disposed on a respective side of the drive drum, and is connected to a respective one of the pull cords. The spiral spring provides a biasing force acting on the drive drum. The friction imposing mechanism provides a friction force acting on one of the drive drum and the pull cords. The biasing force and the friction force cooperate to retain the bottom rail at a desired vertical distance relative to the head rail.

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