Patent ID: 8025089

Claim:
A lifting system for a window covering comprising: a cradle; a drive shaft; a movable shaft disposed on said drive shaft and supported by said cradle, said movable shaft axially movable with respect to said drive shaft and movable axially and rotatably with respect to said cradle; said movable shaft defining a lift cord wrapping portion, an end portion, and a transition member extending between said lift cord wrapping portion and said end portion; a lift cord connected to said movable shaft such that raising of said window covering causes said lift cord to at least partially wrap around said lift cord wrapping portion of said movable shaft and lowering of said window covering causes said lift cord to at least partially unwrap from said lift cord wrapping portion of said movable shaft; wherein said lift cord is connected to said movable shaft to enable said transition member to facilitate migration of said lift cord from said drive shaft back to said lift cord wrapping portion of said movable shaft in order to untangle said lift cord after bird nesting as said window covering is raised or lowered.