Abstract: The invention relates to a chair (1), in particular an office chair, with a backrest (3) which is connected in an articulated manner to a mount (33) by means of a backrest mount (2) and has an adjustable lumbar support (4) and also a seat surface (12) which is attached to the mount (33), so that the inclination position of the backrest (3) and the adjustment position of the lumbar support (4) are coupled to one another by means of a coupling element (10) in such a way that a tilting movement of the backrest (3) towards the rear causes the adjustment position of the lumbar support (4) to change, in particular causes the lumbar support (4) to relax, and a tilting movement of the backrest (3) towards the front likewise causes the adjustment position of the lumbar support (4) to change, in particular causes the lumbar support (4) to tense.

Abstract: A chair, especially an office chair, has a base and a seat disposed thereon as well as a backrest. The seat and the backrest are supported such that they can be pivoted about horizontal axes in a coordinated manner, and at least one gas spring is provided for damping the pivoting movement and for attaining a restoring action.

Abstract: A chair has a seat and a back rest supported by a back rest support to be vertically adjustable, the back rest support being connected, on the one hand, to the back rest and, on the other hand, to the seat. In order, firstly, to enable a simple and elegant vertical adjustment and, secondly, to design the back rest and the seat to be suitable for packaging and, therefore, for dispatch, the back rest support is telescopically composed of an inner and an outer support member, and an interlocking device for the detachable interlocking of the two support members in varying positions, relative to one another, is provided on the back rest support.

Abstract: An activating device for the release tappet of a longitudinally adjustable gas spring. The device is shiftable parallel to the longitudinal axis of the gas spring between a fixed and a release position, and comprises an activating lever fixable in two end pistons. A device connecting the piston of the gas spring with a first housing part of the activating contrivance is effected so that a release tappet projects into a first housing part by means of a ball beneath the release tappet. A second housing part is located beneath the first housing part and the ball in contact therewith. A pivotably stored activating lever section is provided with angularly transposed, coordinated recesses of different depths.

Abstract: In a gas spring arrangement, comprising a gas spring disposed between two elements which are pivotable in relation to one another around a pivot axis, which damps the pivot movement, and a mechanical arrangement with an activating lever for the releasable adjustment of the pivot movement, especially for the adjustment of the inclination of the backrest of office chairs, it is provided, on the one hand, to make possible a simple damping of the pivotal movement of the backrest support part relative to the seat carrier and, on the other hand, to make possible the easily operable yet still secure locking of this pivotal movement, that the gas spring (19) is fastened between two transverse struts (bolts 23, 27), each disposed on an element (seat carrier 4, backrest support 7) parallel to the pivot axis (6), that the mechanical adjustment means (29) has a sheath part (31) and a pistion part (30) longitudinally movable in the sheath part (31), that both the sheath part (31) and the piston part (30) are each connecte