| 摘要 |
In the swivel chair a seat frame and a backrest frame are articulated so as to move and tilt together against the force of a spring, it being possible to fix the relative inclination of the seat and the backrest in a plurality of positions. The complete mechanism for releasing, adjusting, and locking the inclination of the seat frame and the backrest frame, for releasing the height adjustment and for setting the spring force of the tilt is accommodated within a supporting column that is bent to form an obtuse angle. At its lower end, this supporting column encloses a base column that accommodates a pneumatic spring and is able to slide and swivel, and at its upper end it is connected with a horizontal cross tube that extends perpendicularly to it; this cross tube houses the tilt shafts for both the seat frame and for the backrest frame. The tilt shaft of the backrest frame is made up of two torsion bars, each of which is fixed with a longer, angled spring arm within a tube of the lower portion of the backrest frame and abuts with a shorter spring arm on a stop that is so configured as to be adjustable and is located within the upper end of the supporting column. |
