Patent ID: 7717154
Filing Date: 2010-05-18
Classification: E06B

Abstract:
1. A window coverings, comprising at least: an upper elongated member; a lower elongated member spaced from the upper elongated member at a lower position; a slat assembly which has slats and a lift cord means and an upper end of the slat assembly fastened to the upper elongated member and a lower end of the slat assembly fastened to the lower elongated member; a lift cord winding and releasing control means located on the upper elongated member; a first lift cord to control the lower elongated member to be extended downwards in a constant fashion having one end fastened to the lift cord winding and releasing control means and other end threading through the upper elongated member; and a second lift cord to control the lower elongated member to be retracted upwards in a staged fashion having one end fastened and wound around the lift cord winding and releasing control means and other end threading through the upper elongated member; wherein the lift cord winding and releasing control means includes a ratchet and gear set wound by the lift cord means, an auxiliary gear set wound by the second lift cord, a movable member and a driving gear respectively disposed between the ratchet and gear set and the auxiliary gear set, the driving gear is moved by the movable member to engage with the ratchet gear set and the auxiliary gear set to enable the ratchet and gear set rotating with the auxiliary gear set simultaneously.