Patent ID: 7814958

Claim:
A roll-up window shade for a motor vehicles comprising: a rotatably seated winding shaft; a shade sheet having a rectangular shape and having a first edge fastened to the winding shaft; a pull rod that is connected to a second edge of the shade sheet remote from the winding shaft; said pull rod being movable between a retracted position adjacent said winding shaft and a sheet shade extended position away from said winding shaft; first and second guide rails that run parallel to one another on either side of shade sheet when the shade sheet is in an extended position, each guide rail including an undercut guide groove whose cross-section includes a guide chamber and a guide slot; and first and second piping members with the first piping member extending in the guide chamber of the first guide rail and the second piping member extending in the guide chamber of the second guide rail, each piping member being compression and tension resistant and substantially cylindrical; said first and second guide rails each having an inlet edge that runs at an incline to a longitudinal axis of guide rail at an end of the respective guide rail adjacent to the winding shaft, and said first and second guide rails being spaced apart from each other a distance less than a width of shade sheet such that upon movement of said pull rod from retracted to said extended position the shade sheet is forced by the inlet edges to wrap around the piping member in frictional engagement therewith; and each said piping member being connected to the pull rod in a compression resistant manner such that said pull rod is operable for pushing the pull rod to said shade sheet extended position with the shade sheet in such wrapped condition.