Patent ID: 7828039

Claim:
A window shade for a window of a motor vehicle comprising: a rotatably supported wind-up roller shaft; a window shade material having first and second parallel edges, the first edge of the window shade material being attached to the wind-up roller shaft; a first drive device for rotating the wind-up roller shaft in a wind-up direction; a pull rod attached to the second edge of the window shade material, the pull rod including at least one guide groove extending in a longitudinal direction of the pull rod, wherein the guide groove has a cross-sectional shape including a groove chamber and a groove slot, the groove slot having an open width smaller than an open width of the groove chamber; two holding levers each of which is supported via a respective bearing such that the respective lever can pivot about a respective pivot axis that extends perpendicular to a longitudinal axis of the wind-up roller shaft; a second drive device coupled to the holding levers for moving the holding levers from a first position in which the pull rod is adjacent to the wind-up roller shaft to a second position in which the pull rod is farther removed from the wind-up roller shaft; wherein each holding lever is hingably connected to a respective sliding element, the sliding element including a head and a bracket that extends from the head, said bracket of each sliding element being connected as a hinge to a respective one of the holding levers, the head sitting in and at least partially surrounded by the groove chamber of the at least one guide groove in the pull rod and the bracket sitting in the groove slot so that the respective sliding element can move in the at least one guide groove, each sliding element including a lubricant reservoir that is formed in the head of the sliding element that sits in the groove chamber; and said head of each sliding element having a length relative to a direction parallel to the longitudinal extent of the guide groove that is at least two times greater than a largest cross sectional dimension of the groove chamber.