本机构为自适应同步倾仰底盘，拥有4档锁定，具有回力安全保护功能，扳动手柄A可使底盘自由升降；拉动手柄A可调节座和背的角度，座的角度为$0\sim 3^{\circ }$ ,背的调节角度为$90\sim {120}^{\circ }$ ;旋转旋钮H,可实现背的范围调节，分别为${18}^{\circ }$ , ${24}^{\circ }$ 和 ${30}^{\circ }$ , 扳动手柄G可调节滑板滑动，最大滑动距离为58MM，拥有5档锁定。

Self weight adjusting synchronized mechanism with backrest return prevention safety function and 4 locking positions: Paddle A is not only for seat height adjustment but also for seat and back movement. The seat angle is in the range of $0\sim 3^{\circ }$ , and back angle is $90\sim {120}^{\circ }$ .Rotating knob H for different angle ranges ${18}^{\circ }$ , ${24}^{\circ }$ and ${30}^{\circ }$ . Paddle G is for seat slider movement within a 58mm's travel in 5 locking positions.