Deformable crank for windscreen wiper mechanism, comprising an oblong quadrilateral hole

摘要

The invention relates to a crank ( 14 ) which is intended for the windscreen wiper mechanism of a motor vehicle. The inventive crank is of the type that comprises a horizontal body ( 16 ) having a first end ( 14 a) which is linked in rotation to a wiper arm and a second end ( 14 b) which is articulated to a connecting rod. The aforementioned body ( 16 ) comprises: a segment ( 22 ) which can be deformed in order to adjust the distance between the ends ( 14 a, 14 b) of the crank ( 14 ), and a longitudinal oblong hole ( 24 ) which divides the aforementioned segment ( 22 ) into two deformable longitudinal branches ( 26 ) which are symmetrical in relation to a centre line of said segment ( 22 ). The invention is characterised in that the oblong hole ( 24 ) takes the form of a quadrilateral with two essentially-perpendicular diagonals (E 1 , E 2 ), the larger diagonal (E 1 ) extending along the main axis (C) of symmetry of the segment ( 22 ) and intersecting the small diagonal (E 2 ) at the midpoint thereof.