| 摘要 |
The vertically adjustable swivel-chair supporting column with an upright tube (1) located on the foot and with a support tube (2) telescopically movable in the latter and intended for receiving the chair seat part is provided with a lockable length-adjusting element (21) which is installed between the two tubes (1, 2) and the pull-out length of which can be adjusted in steps. The length-adjusting element (21) connected to a tube (1, 2) fixed on the same side as the foot and extendable on the same side as the seat carries, at the distal end (2.1) of the support tube (2), a guide member (22), in which is retained a linkage member (41, 42) intended for controlling the pull-out length of the supporting column. The length-adjusting element (21) is centered and supported by means of a spring intermediate piece (23) on the fixed end (1.1) of the upright tube (1). |
