Patent ID: 7096918
Filing Date: 2006-08-29
Classification: E06B

Abstract:
1. A winding device for a window blind, comprising: a headrail extending in a longitudinal direction; a winding drum extending in the longitudinal direction, mounted on said headrail, operable so as to rotate relative to said headrail, and having a threaded drum portion, and a smooth drum portion extending from said threaded drum portion; a pull cord that extends through said headrail, and that is secured to said smooth drum-portion of said winding drum; a carriage member threadedly engaging said threaded drum portion, and movable along said threaded drum portion in a first axial direction when said winding drum is rotated in a first rotational direction so as to wind said pull cord on said smooth drum portion of said winding drum, and in a second axial direction opposite to the first axial direction when said winding drum is rotated in a second rotational direction opposite to the first rotational direction so as to unwind said pull cord from said smooth drum portion of said winding drum; and a guide member coupled to said carriage member so, as to be co-movable therewith, and having a distal end distal from said carriage member, and connected to and in sliding contact with said pull cord so as to guide said pull cord such that winding turns of said pull cord on said smooth drum portion of said winding drum are formed adjacent to one another without overlapping.