Patent ID: 7235030

Claim:
A step down gear train, for an adjusting device of an automotive vehicle seat, comprising: an output shaft that rotates about an output axis, a housing that is rotatable relative to the output shaft, a toothed washer having a circumferential first toothed surface, an eccentric that is rotatably disposed on said output shaft and has an eccentric driving surface which is offset relative to the output axis by an eccentricity, the eccentric comprising a driving region, an annular gear comprising a circumferential second toothed surface, a circumferential third toothed surface and an eccentric driven surface cooperating with the driving surface, a gearwheel comprising a circumferential fourth toothed surface, said first toothed surface of the toothed washer and said second toothed surface of the annular gear meshing together in a first angular position and forming a first nutating gear having the eccentricity and the third toothed surface of the annular gear and the fourth toothed surface of the gearwheel meshing together in a second angular position that is offset by 180 degrees relative to the first angular position with respect to the output axis and forming a second nutating gear also having the eccentricity, wherein there is provided a driver member that is connected to the ouput shaft and a driver surface that is formed in the gearwheel and configured to cooperate with said driver member and configured to provide a non-rotatable, releasable connection between the driver member and the gearwheel.