Abstract: The invention relates to an adjustable motor vehicle seat with at least one of a horizontal seat adjustment, a seat height adjustment, a seat depth adjustment, and a seat back adjustment, as well as with a neck rest that is adjustable by an electric motor and guided by at least one sensor unit which is influenced by the size of the user, wherein the neck rest adjustment is controlled by an electronics unit which evaluates the sensor signals. An object of the present invention is to provide an economical vehicle seat which is independent of the level of equipment of the vehicle, wherein the neck rest is moved automatically in dependence on sensed parameters which take into account the body size of the user. This is achieved in that the electronics unit is mounted in the region of the neck rest which is adjustable by electric motor.

Abstract: An installation 10 for the longitudinal adjustment of a seat, especially of a motor vehicle seat which includes a top rail 30 supporting the seat, which is form-lockingly longitudinally displaceably guided on a coordinated bottom rail 44. A drive mechanism 12 with drive pinion 24 is connected with one of the two rails; the drive pinion 24 engages into a toothed rack 56 mounted at the other rail 44 and extending along the same. In order to establish with a simple structure an always reliable mutual engagement of the pinion and toothed rack, also in case of high loads caused by accidents, the other rail 44 is provided with a guide groove 98 for at least one guide bolt 92 mounted at the drive mechanism 14 or at the rail 30 within the area of the pinion 24.