| 摘要 |
The chair support comprises a supporting structure, a seat holder and a backrest holder. The seat holder is connected by means of a first swivel joint with the supporting structure and by means of a second swivel joint with the backrest holder. At an arm or arm structure of the backrest holder extending in a direction towards the front end of the chair support where the seat user's legs will fit, a guide rod or link and the piston rod of a spring element are rotatably mounted by means of a third swivel joint, while at the other end of the chair support, the spring element is mounted by means of a holding bracket at a swivel joint supported in the supporting structure. At the spring element, there is provided an operating slide tappet or plunger for alternately blocking and allowing free movement of the spring element, which is operable by means of an operating or actuating mechanism composed of a rod and a two-armed angle lever mounted in the holding bracket and by means of an adjusting lever. Operatively associated with the adjusting lever is a locking mechanism which makes possible the blocking and free movement of the spring element using just the adjusting lever. |
