Abstract: The chair according to the invention has a seat, a backrest, a support frame, and at least one S-shaped leaf spring. The S-shaped leaf spring at a first section is fastened to the support frame, the seat is mounted at a second section, and the backrest is mounted at a third section. A first curvature is provided between the first and second sections, so that in a neutral position of the chair the first section and the second section are situated essentially in parallel to one another and are spaced apart, and the third section adjoins the second section via a second, opposite curvature. A compressible spacer that is displaceably guided in the longitudinal direction of the first section is provided between the first and the second section.

Abstract: A chair includes a deformable seat shell forming a seat part and a backrest, and further includes a frame, the seat part being connected to the frame by means of a first pivot joint and the backrest being connected to the frame by means of a second pivot joint, the pivot joints allowing a twisting of the seat part and of the backrest relative to the frame caused by a deformation of the seat shell. The second pivot joint is connected to the backrest centrally in relation to the transverse direction of the chair.

Abstract: A chair includes a deformable seat shell forming a seat part and a backrest, and further includes a frame, the seat part being connected to the frame by means of a first pivot joint and the backrest being connected to the frame by means of a second pivot joint, the pivot joints allowing a twisting of the seat part and of the backrest relative to the frame caused by a deformation of the seat shell. The second pivot joint is connected to the backrest centrally in relation to the transverse direction of the chair.

Abstract: The invention relates to a chair with a seat, a base support and a backrest, wherein the seat is mounted on the base support so as to be pivotable about a first pivoting axis and the backrest is mounted on the seat so as to be pivotable about a second pivoting axis. The two pivoting axes are arranged so as to be displaceable relative to one another in order to be able to change the seat depth.

Abstract: The invention relates to a chair with a seat, a base support and a backrest, wherein the seat is mounted on the base support so as to be pivotable about a first pivoting axis and the backrest is mounted on the seat so as to be pivotable about a second pivoting axis. The two pivoting axes are arranged so as to be displaceable relative to one another in order to be able to change the seat depth.