Abstract: The invention relates to a lumbar support comprising a plurality of pneumatically operated chambers (11-14) for adjusting the curvature of a seat back, wherein the lumbar support comprises two outer chambers (11, 12) and two central chambers (13, 14) in the longitudinal direction of the seat back, wherein the two central chambers (13, 14) are arranged over one another perpendicularly to the longitudinal direction of the seat back between the two outer chambers, wherein each outer chamber has an air connection to one of the two central chambers.

Abstract: A lumbar support to be integrated in a seat frame is proposed, in particular in a seat frame for a motor vehicle seat, the lumbar support comprising a correspondingly bent guide wire (4) onto which a plurality of finger-like support elements (6) made from plastics and extending transversely to the lumbar support are injection moulded. Bracing wires (8, 10) for fastening a seat cover or seat upholstery, as well as a transverse wire (12) for the automatic actuation of a head restraint, can also be attached to the guide wire (4) by overmouldings (9, 11, 13). All plastics components can be made in a single step with the aid of a suitable injection mould.

Abstract: The invention relates to a support with adjustable arch, especially a lumbar support for seats, in particular motor vehicle seats and chair back rests as well as for any type of bed, the structure of which comprises an arching element and an adjustment device for setting and readjusting the arching of the arching element.

Abstract: An apparatus for adjusting the arching of a resiliently flexible support element (4) for supporting the pelvic and/or lumbular vertebrae in a back rest of a seat including an arching mechanism comprising a spring and an operating mechanism. According to the invention the spring (20, 35; 21, 38) is included in the force transmission tract for adjusting the arching. Preferably a spring (20, 35) is fitted between one end of the support element (4) and the force transmission member of the arching mechanism and/or a spring (21, 38) is fitted to the free end of the force transmission member of the arching mechanism behind the operating mechanism.

Abstract: Arching mechanism, for instance for backrests of seats, medical or orthopaedic apparatus or casings and the like, with a pressure element wherein at least one traction element connected with a tensioning mechanism engages, which, when the mechanism is actuated can produce bulging by preserving a relative elevation of apex of the convexity; the arching mechanism can comprise a frame with inserted pressure elements actuatable by adjusting device(s), whereby frame segments are length-variable pressure elements; traction elements provided with tensioning mechanism can engage a slitted, overlapping or bellows-like bulging body for the opening and closing of these areas, which produces a curving of the bulging body in a predetermined direction or directions.