Windshield wiper device with a non-circular sweeping motion

In a windshield wiper device with a non-circular sweeping motion, for vehicles, comprising a blade which has a composite motion comprising an alternating oscillation about an axis of rotation combined with a movement of translation, such that the windshield wiper blade describes a first path during an outward movement stage of the oscillation from a first angular end position to a second angular end position, and a second path, which differs from the first path, during a return movement stage thereof from the second end position to the first end position, the improvement comprising, a drive mechanism for causing the longitudinal ends of the windshield wiper blade and the windshield wiper blade between said ends to describe paths having the shape of a curved and flattened figure 8 whose concave area faces the axis of rotation, with the point of intersection of the lobes of the flattened 8 being disposed substantially in the axis of the vehicle, and the ends of the lobes being substantially tangential to the angular end positions of the windshield wiper blade, and wherein said drive mechanism comprises, a main windshield wiper arm which carries, at a location remote from the axis of rotation, a rocker arm articulated on the main arm for movement about a first transverse axis which is substantially parallel to the surface to be cleaned, said windshield wiper blade being articulated to said rocker arm for movement about a second transverse axis substantially parallel to said first transverse axis, an auxiliary arm articulated on the rocker arm, generally between said two transverse axes, said auxiliary arm controlling the rocker arm movements to cause a displacement of the windshield wiper blade in a direction substantially parallel to its longitudinal direction, in which the movements of the main arm and the auxiliary arm are angularly offset such that, in the two angular end positions of the main arm and in the median position of this arm, the two articulations of the auxiliary arm and the main arm occupy a relative median position in the longitudinal direction of the main arm, whereas these two articulations move, during the outward stage, through a relative end position for a position of the main arm disposed between the first angular end position of the main arm and its substantially median position, and during the return stage from said second end position, the articulations pass through the relative end position for a position of the main arm disposed between the second angular end position of the main arm and its substantially median position.