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 $0\sim 5^{\circ }$ ，背的调节角度为 $90\sim {110}^{\circ }$ ；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 $0\sim 5^{\circ }$ , and back angle is $90\sim {110}^{\circ }$ , And Paddle G is for seat slider movement within a 58mm's travel in 5 locking positions.