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，调节手柄A可使底盘自由升降；手柄C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$90\sim {110}^{\circ }$ ；手柄F可快速调节弹簧松紧，拥有5档力度可调。扳动手柄G可调节滑板滑动，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 for seat height adjustment, Paddle C is for seat and back movement. The seat angle is in the range of $0\sim 3^{\circ }$ and back angle is $90\sim {110}^{\circ }$ . Paddle F is for quick spring tension shift in 5 steps. Paddle G is for seat slider movement within a 58mm's travel in 5 locking positions.