A rotary chair has an upright support column provided with an internally arranged gas spring device controlled by a valve. A seat has a lower supporting shell and an upper shell connected with the lower shell and adapted to be provided with upholstery. In the interior space surrounded by the shell are located transmission linkages one of which operates the valves of the gas spring and the other of which effects tiltable displacement of a backrest unit mounted on the seat. Pushbuttons are accessible at the exterior lower side of the lower shell and are connected with the linkages so as to operate the same when depressed.
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