Abstract: An arresting device in a longitudinally adjustable guide rail assembly for motor vehicle seats includes a shaft rotatably supported in a stationary bearing plate and driven by a stationary electromotor; the driving pinion of the electromotor is in mesh with an intermediate gear which is supported for free rotation on the shaft; a coupling disk is supported for joint rotation on the shaft and for an axial displacement between the bearing plate and the face of an intermediate gear. The bearing plate portion opposite the coupling disk is provided with a ring of arresting teeth and also the facing side of the intermediate gear is provided with a corresponding toothing. Both sides of the coupling disk are serrated and normally are urged by a cup spring into engagement with the arresting teeth of the intermediate gear.

Abstract: A seat component of an adjustable seat, particularly of a motor vehicle seat, is mounted on a base component for movement generally in the forward and rearward direction of the seat. A toothed rack is rigidly mounted on the seat component, and a pinion member is mounted on a driving shaft and meshes with the toothed rack. A driving element of a disk-shaped configuration is rigidly connected to the driving shaft and has a plurality of circumferentially distributed openings which receive corresponding tooth-shaped projections of the pinion member to entrain the pinion member for joint rotation with the driving shaft. The pinion member is displaceable axially of the driving shaft to engage the tooth-shaped projections in, and disengage the same from, the corresponding openings of the driving element.

Abstract: A hinged mount for vehicle seats having reclinable backrest includes a motor driven pivot axle connected to a setting shaft for the angular position adjusting and arresting device. The shaft supports for joint rotation an axially displaceable coupling disk having on each face thereof a ring of coupling teeth. The pinion of the driving motor is in mesh with an idling gear supported on the setting shaft and a cup spring urges the coupling disk into engagement with the idling gear. In the case of accidental rotation of the setting shaft caused by inertial forces acting against the backrest in the case of an accident, for example, the coupling teeth of the coupling disk slide on the toothing of the idling gear and the teeth on the other side of the disk engage an arresting ring which is secured to the reclinable mount part.