| 摘要 |
The chair support comprises a supporting structure, a seat holder and a backrest holder. The seat holder is pivotably or swivelably connected by means of a first swivel joint with the supporting structure and by means of a second swivel joint with the backrest holder. The backrest holder possesses an arm or arm structure and a substantially flat-surfaced hollow tube which is fitted and fastened in a holding support of the arm. The arm or arm structure projecting into about the middle of the chair support between the first and the second swivel joint is connected with a third swivel joint by means of guide rods or links which are supported at the supporting structure by means of a fourth swivel joint. A first spring element engages at the third swivel joint and a second spring element engages at the supporting structure. Both spring elements are releasable and blockable by means of operating or actuating rods. In spite of the space-saving and simple construction of the chair support, the usual seating comfort of such chairs is offered. |
