ADJUSTING DEVICE FOR LONGITUDINAL ADJUSTMENT OF A VEHICLE SEAT

A rail assembly for longitudinal adjustment of a vehicle seat comprises a lower rail () and an upper rail () movable relative to the lower rail, and a movable support member () disposed between the lower rail () and the upper rail (), wherein the lower rail () comprises a stopper () disposed at a predetermined position of the lower rail (), and the movable support member () comprises a base () for supporting the upper rail () on the lower rail () and a coupling member () for releasably coupling the movable support member () with the upper rail (). The coupling member () can be displaced relative to the base. Movement of the movable support member () relative to the lower rail () in the longitudinal direction is stopped by the stopper () at the predetermined position, and displacement of the coupling member () relative to the base () is controlled by the position of the upper rail (), for controlling a coupling and decoupling of the movable support member () to the upper rail ().