Patent ID: 9095908
Filing Date: 2015-08-04
Classification: A47H,B23B,B23Q,E06B,Y10T

Abstract:
1. A window covering assembly, comprising: a drive element extending a length from a first end to a second end; the drive element having at least one guide structure formed on or into an outer surface of the drive element; wherein the at least one guide structure includes at least one clockwise helical groove; wherein the at least one guide structure includes at least one counterclockwise helical groove; wherein the at least one clockwise helical groove and the at least one counterclockwise helical groove periodically intersect one another along a length of the drive element; a first drive attachment element having a corresponding first structure that communicates with one or more of the at least one guide structure to move the first drive attachment element axially along the drive element when the drive element is rotated about a longitudinal axis of the drive element; wherein at least a portion of the drive element is hollow; and wherein the outer surface of the drive element has a circular cross-sectional shape.