Patent ID: 8919416

Claim:
An apparatus for raising and lowering a covering member of a window covering, wherein the apparatus is received close to or in a headrail of the window covering, the apparatus comprising: a sliding base having a coupling portion, wherein the sliding base is moved between a first position and a second position in the headrail; a first biasing device having a first string, a first reel, and at least one first biasing member, wherein the first string has an end fastened to the sliding base and is wound around the first reel; the first biasing member is deformed by the first reel to provide a first recovering force, and the first recovering force moves the sliding base toward the first position; a connecting device having a connecting portion in association with the coupling portion of the sliding base, wherein the connecting device is moved between a third position and a fourth position in the headrail; the third position is closer to the first position than the fourth position, and the fourth position is between the first position and the second position; and a second biasing device having a second biasing member, wherein the second biasing member provides a second recovering force to move the connecting device toward the third position; wherein the connecting portion of the connecting device disengages the coupling portion of the sliding base when the sliding base is moved toward the second position from the first position and arrives at the fourth position, and the connecting portion of the connecting device engages the coupling portion of the sliding base when the sliding base is moved toward the first position from the second position and arrives at the fourth position.