Abstract: An assembly for incorporation in a seat back to provide adjustable lumbar support comprises a platform element suspended by tension springs in a seat frame to support the cushioning of a back rest. The platform element has elongate lateral rails between which extend transverse wires that provide the platform support. A Bowden cable is linked between respective portions of each of the rails to apply a force of longitudinal compression, whereby the rails are caused to be hinged outwardly at an articulation point to vary the lumbar support provided by the transverse wires.

Abstract: A frame for an automobile seat or a domestic seat comprises a base frame; a pad which consists of a series of parallel cords and a series of parallel cross-wires, and is suspended over the base frame; spring elements having torsion parts secured to the cords of the pad; and an edge frame mounted above the base frame on limbs of said spring elements which extend upwardly and outwardly from the side edge regions of the pad and are secured at their upper ends to said edge frame. The spring elements have lengths which may be anchored on said pad or on said base frame, and spring elements of both forms may be employed.