US Patent 10065538 Articulation mechanism and vehicle seat having such a mechanism

An articulation mechanism comprising first and second frames mounted in a rotatable manner with respect to one another and connected together by a gear controlled by an input member (11) actuating an eccentric cam mounted in a rotatable manner in a cylindrical housing integral with the first frame. The cam is formed of two cam parts that are elastically urged towards a position of maximum eccentricity and are movable towards a position of minimum eccentricity during actuation of the input member. A load-spreading washer is mounted in a rotatable manner with play in the cylindrical housing, parallel to the eccentric cam.