Patent ID: 8485489

Claim:
A longitudinal adjustment mechanism supporting a seat, with a spindle guide nut that can move on a spindle, which can be driven by a worm gear with a bearing sleeve on each end of the worm gear, and with a multi-part casing that receives the worm gear and the spindle, characterized in that the multi-part casing has two casing sections made of plastic, which can be inserted into one another in the axial direction of the spindle, each casing section has a plate, from which bars protrude from a location on the plate on either side of said spindle, where the bars protrude in a direction toward the worm gear and parallel to the spindle, at least one of the casing sections comprise a bar arrangement comprising at least one bar having a u-shaped configuration that juts out to encompass one of the bearing sleeves of the worm gear by more than 180°, and the bar encompassing at least one bearing sleeve of the worm gear has an arch-shaped recess, the arch-shaped recess extends greater than 180° forming a circular opening, where the arch-shaped recess is situated between two end wedge openings, such that each end of the arch-shaped recess conclude as end wedge openings.