Abstract: An arrangement in a chair (1), having an adjustable chair back (2) and a neck support (3), characterized in that the arrangement comprises a device (12, 15) which influences the shape of the chair back (2) in dependence of the inclination of the chair back (2). The chair provides a pronounced support for the user's lower back when the chair back (2) is in an erected sitting position, whereas the device (12, 15) renders a gradually decreasing support of the user's lower back when said chair back (2) is lowered rearwardly towards a lying position. The lumbar region support (6) co-operates with a system for regulating the neck support (3) and the return thereof to a normal position each time the chair back (2) arrives at an extreme upper or lower position.

Abstract: The invention relates to a device in a chair, especially an adjustable chair (1aa) having an articulation means (7) between a seat member (3) a back rest member (8a), so as to allow an alteration of the angular position therebetween, the alteration taking place by a pivoting said back rest member (8a) around a pivoting point (8) whilst said seat member (3) is displaced along a predetermined sliding path. The invention is characterized in that the device comprises one or more curved sliding means (1), the radius of curvature (R) of said sliding means (1) or the center (4) thereof being arranged in accordance with given functional properties of said chair (1aa), which in turn means that for example an increase of the tangential angle (.alpha.

Abstract: A chair provided with frictional coupling means for use in adjusting the relative angular position of the seat and the back thereof relative to each other.