Window regulator mechanism for a vehicle

Claim 1

A window regulator mechanism for raising and lowering a curved window pane of a motor vehicle having a door inner panel, comprising a horizontally extending guide rail attached to said window pane, a horizontally extending auxiliary guide rail attached to said door inner panel, a base plate attached to said door inner panel, a regulator arm pivotally connected at its one end to said base plate through a pivot shaft mounted on said base plate and carrying at its other end guide roller rollably received in said guide rail, said regulator arm including an extension having a sliding surface, an auxiliary regulator arm pivotally connected to said regulator arm and carrying at its both ends guide rollers rollably received in said guide rail and said auxiliary guide rail respectively, driving means mounted on said base plate and operatively connected to the one end of said regulator arm for actuating the same to raise and lower said window pane, and a guide ridge provided on said base plate between said pivot shaft and said driving means and having the general shape of an annular segment, a spring washer disposed between said regulator arm and said base plate about said pivot shaft, said spring washer holding said regulator arm at a height from said base plate, at the pivot connection thereto, which is different from the height of said guide ridge, the sliding surface of said extension of said regulator arm being held by said spring washer in sliding contact with said guide ridge, whereby the distance between the center of said pivot shaft and a point of sliding contact between said sliding surface of said extension and said guide ridge varies in dependence on the angular position of said regulator arm, and the other end of said regulator arm moves in a path substantially parallel to the curvature of said window pane.