Abstract: A spindle drive for a lumbar support in a backrest structure of a motor vehicle seat includes two gliders guided on a carrier of the lumbar support. Each glider is connected to a spindle nut which is engaged with an associated thread section of a spindle. The thread sections have threads of opposite thread pitch, so that the gliders are movable in opposite directions and pivot towards and away from the carrier supporting bails of a supporting device hinged to the carrier and being adjustable substantially perpendicular to the carrier. At least one of the spindle nuts partly encompasses the spindle and can be clipped onto its associated thread section of the spindle.

Abstract: A backrest structure for a motor vehicle seat includes a rest frame forming the supporting structure of the backrest. The rest frame includes at least two longitudinal struts running in the longitudinal direction of the backrest. The backrest structure also includes a lumbar support arranged on the front side of the rest frame for supporting the back region of a motor vehicle occupant. The lumbar support includes a transverse traverse being adjustable along the longitudinal struts with a height adjusting device, to which a support device is hinged and is adjustable with a depth adjusting device substantially perpendicular to the transverse traverse. The lumbar support further includes a retaining device supporting the transverse traverse and extending substantially in the longitudinal direction of the backrest and receiving the height adjusting device.

Abstract: A backrest structure for a motor vehicle seat is provided. The backrest structure having a rest frame forming the supporting structure of the backrest, which rest frame comprises at least two longitudinal struts running in the longitudinal direction of the rest, a lumbar support arranged on the front side of the rest frame for supporting the back region of a motor vehicle occupant having a transverse traverse being adjustable along the longitudinal struts by means of a height adjusting device, to which a support device is hinged and is adjustable by means of a depth adjusting device substantially perpendicular to the transverse traverse. A retaining device supporting the transverse traverse and extending substantially in the longitudinal direction of the rest and receiving the height adjusting device.

Abstract: A spindle drive for a lumbar support in a backrest structure of a motor vehicle seat having a rest frame forming the supporting structure of the backrest and having the lumbar support arranged at the front side of the rest frame for supporting the back region of a motor vehicle occupant having a carrier to which a supporting device adjustable substantially perpendicular to the carrier is hinged, which supporting device comprises two supporting bails extending perpendicular to the longitudinal direction of the rest, which supporting bails are pivotably hinged to the carrier about an axis extending in the longitudinal direction of the rest and are pivotable towards and away from the carrier by means of the spindle drive. The spindle drive comprising two gliders guided on the carrier, which are connected to a spindle nut, which are engaged with thread sections of a spindle having two threads of opposite thread pitch, so that the gliders are movable in opposite directions and pivot the supporting bails.