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，调节手柄A可使底盘自由升降；手柄E可调节座的起始角度，可调节2个位置，分别为前倾$3^{\circ }$ 和后仰$1^{\circ }$ ；手柄C可调节座和背的角度，座的角度为$1\sim 9^{\circ }$ ，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；手柄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: Paddle A is for seat height, Paddle E is for Seat initial angle adjustment, the seat initial angle is $3^{\circ }$ forward and $1^{\circ }$ backwards. Paddle C is for seat and back movement. The seat angle is in the range of $1\sim 9^{\circ }$ and back angle is $90\sim {110}^{\circ }$ . Paddle F is for quick spring tension shift in four steps, and Paddle G is for seat slider movement within a 58mm's travel (optional 76mm).