Longitudinal adjustment device in a vehicle seat, especially for two-door motor vehicles

Claim 1

A longitudinal adjusting device on a motor vehicle seat having a seat part and a seat back, wherein the seat back is connected by adjusting hardware to the seat part and is configured to be tilted adjustably with respect to the seat part and to be flipped forward after releasing an arresting device, wherein the longitudinal adjusting device comprises: movable rails on which the seat part is fastened, the moveable rails configured to slide in guide rails permanently attached to the vehicle, wherein at least one of the movable rails has a locking device configured to releasably lock the moveable rail on the guide rail; the locking device having a positioning device configured to allow a return of the seat to a previously selected longitudinal position; the positioning device comprising a positioning disc with a set of locking teeth and an arresting lever having a toothed segment engaging the locking teeth in a selected position of the seat, wherein the arresting lever is fixedly positioned relative to the movable rail and is configured to be disengaged from the locking teeth to allow rotation of the positioning disc during longitudinal adjustment of the seat; a spring-loaded winding drum positioned coaxially to the positioning disc and configured to allow the seat part to slide forward by intermediate action of a tension member attached to the seat part or to the guide rail; the winding drum having a stop and the positioning disc having a counter stop, wherein the stop is configured to limit a reverse rotation of the winding drum caused by the counter stop of the positioning disc; the positioning device comprising a spiral connecting link; and a link block guided in the spiral connecting link and being located between the stop of the winding drum and the counter stop of the positioning disc; the link block being configured to allow rotation of the winding drum.