Abstract: An adjustable seat for a motor vehicle including a substantially horizontal seating element, on a rear part of which is articulated a back. An adjusting device adjusts the position of the seating element of the seat relative to the vehicle structure and locks and unlocks the adjusting device. A reinforcing device, separate from the adjusting device, absorbs at least part of the impact loads provoked by a longitudinal shock, in particular at the front of the vehicle so that, at the time of impact, the deformation of the adjusting device is reduced, thereby reducing the tilting movement, in particular forward, of the adjustable seat about a rocking axis with global transverse orientation.

Abstract: The invention concerns an adjustable seat (10) for motor vehicle comprising a substantially horizontal seating element (14) of the rear part of which is articulated a back (16), a device for adjusting (21) the position of the seating element (14) of the seat (10) relative to the vehicle structure and means for locking and unlocking the adjusting device (21). The invention is characterized in that it comprises reinforcing means (56), separate from the adjusting device (21), which absorb at least part of the impact loads provoked by a longitudinal shock, in particular at the front of the vehicle so that, at the time of impact, the deformation of the adjusting device (21) is reduced, thereby reducing the tilting movement, in particular forward, of the adjustable seat (10) about a rocking axis with global transverse orientation.