Vehicle seat including a pivoting backrest mounted by means of a device capable of withstanding high torques

A vehicle seat including a seat cushion and a backrest each equipped with a rigid framework, the backrest being mounted so that it can pivot with respect to the seat cushion about a horizontal axis of pivoting, the pivoting of the backrest being controlled by an adjustment mechanism which includes a rotary input member, a support member fixed to one of the two frameworks, termed first framework, and a rotary output member driving the other of the two frameworks, termed second framework, this output member having an axis of rotation parallel to the axis of pivoting of the backrest, wherein the axis of rotation of the output member of the adjustment mechanism is offset with respect to the axis of pivoting of the backrest, the output member driving the second framework via a linkage member which is mounted so that it can slide at least radially with respect to an axis chosen from the axis of pivoting of the backrest and the axis of rotation of the output member, the linkage member furthermore being mounted so that it can pivot about an axis parallel to the axis of pivoting of the backrest, the pivoting of the linkage member taking place with respect to either the output member or the second framework, the axis of pivoting of the linkage member being separated from the axis of rotation of the output member by a first distance, and the axis of pivoting of the linkage member being separated from the axis of pivoting of the backrest by a second distance which is greater than the first distance.