Patent attributes
A window curtain may include a top track, at least a sliding unit, and a plurality of shades, and the top track has at least two track rods sleeved together, which reduces the packaging and shipping costs. Each of the track rods is hollow to form a channel therein, and the channel comprises two vertical guide tracks. The sliding unit comprises a plurality of first sliding bases formed in parallel, and each of the first sliding bases other than the innermost one is connected to a second sliding base. Each of the second sliding bases comprises a pulley support, and each of the pulley supports has at least a pulley set installed thereon. The pulley sets are adapted to slide along the track rods through the guide tracks which have no height difference so as to improve the smoothness of sliding movement of the pulley sets.
