Patent ID: 6227617
Filing Date: 2001-05-08
Classification: B60N

Abstract:
A lumbar support for a seat back, in particular a seat back of a motor vehicle seat, the lumbar support comprising:a forward-bowed support plate (1) that is height-adjustable, moving upward and downward on guide organs that are fixable fixed with respect to the seat back, and that is also variable in its curvature by a tension bracket that can be lengthened or shortened by a first drive motor, where the tension bracket consists of upper and lower bracket regions (3a; 3b) acting on upper (1a) and lower end regions (1b) of the support plate (1), respectively, each said bracket region having thread regions of opposite handedness pointing toward one another which are externally engaged by a common rotatable sleeve (11) with appropriately designed meshing areas, characterized in that a first drive motor (10) is fixed to a gear case (2) arranged behind the support plate (1), and the first drive motor (10) drives gear wheels of a first gearbox, the first gearbox having a final gear wheel (13a) standing in engagement with the common rotatable sleeve (11), which has inside thread regions of opposite handedness.