本机构为同步倾仰底盘，拥有4档锁定，具有回力安全保护功能，拉线A可使底盘自由升降；拉线C可调节座和背的角度，座的角度为$0\sim 8^{\circ }$ ，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4档力度可调；拉线G可调节滑板滑动，滑动距离为58mm (可选76mm)。

Synchronized mechanism with backrest return prevention safety function and 4 locking positions: Cable paddle A is for seat height, Cable paddle C is for seat and back movement. The seat angle is in the range of $0\sim 8^{\circ }$ and back angle is $90\sim {110}^{\circ }$ . Paddle F is for quick spring tension shift in four steps, and Cable paddle G is for seat slider movement within a 58mm's travel (optional 76mm).