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，调节A手柄可使底盘自由升降；手柄C可调节座和背的角度，座的调节角度为$0\sim {10}^{\circ }$ ，背的调节角度为$90\sim {115}^{\circ }$ ；手柄F可调节弹簧松紧，拥有4档力度调节；手柄G可调节滑板滑动，滑动距离为58mm。

Synchronized mechanism with backrest return prevention safety function and 4 locking positions: Paddle A is for seat height, paddle C is for seat and back movement. The seat angle is in the range of $0\sim {10}^{\circ }$ and back angle is $90\sim {115}^{\circ }$ . Paddle F is for quick spring tension shift in four steps. Paddle G is for seat slider movement within a 58mm's travel.