Patent ID: 7997648

Claim:
An adjustment device for a seat depth adjustment of a motor vehicle seat comprising: a seat back; an underframe; a seat pan carried by the underframe; the seat pan comprising a seat part, a supporting plate slidably connected to the seat part via a guide in a longitudinal direction, a rear region of the seat pan formed by the seat part and a front region of the seat pan formed by a front edge of the supporting plate; the seat part and the supporting plate are displaceable with respect to each other in the longitudinal direction, wherein when displacing the seat part and the supporting plate with respect to each other the distance between the rear region of the seat pan and the front region of the seat pan is adjusted between a position of shortest seat length of the seat pan and a position of greatest seat length; a covering extending over the seat pan, the covering comprising a border, the border moves relative to a front edge of the supporting plate when the seat pan is adjusted between the position of shortest seat length of the seat pan and the position of greatest seat length; and an electric gear motor including a pinion; wherein the seat part comprises a first gear plate, the supporting plate comprises a second gear plate, the guide includes a left profile and a right profile on one side of the guide, the profiles being formed on the first gear plate and are integral with the first gear plate and, on another side of the guide, includes a left counterprofile and a right counterprofile that are formed on the second gear plate and are integral with the second gear plate, the left and right counterprofiles contacting and mating with the left and right profiles respectively, a toothed rack defining teeth is associated with each counterprofile and is arranged in a same plane as each counterprofile and extends in a same direction of each counterprofile, and the teeth of the toothed racks face each other, the teeth of each of the toothed racks are integral with the associated counterprofile, each toothed rack is in engagement with a gear wheel and each toothed rack is drivingly connected to the pinion of the gear motor.