本机构适用于气压式升降系统，调节A手柄可使底盘自由升降，旋转E手柄可调整底座初始角度，调节角度为$-4\sim 5^{\circ }$，调节手柄D可使底座在${20}^{\circ }$范围内摆动，调节手柄B可使椅背在一定范围内摆动，椅背采用背板，当座的初始角度为$5^{\circ }$时，背的调节角度为$89\sim {107}^{\circ }$。手柄F能调节底盘前后滑动，滑动范围64.8MM，拥有6档锁紧状态。

Heavy duty Independent seat and back movement . Paddle A is for seat height adjustment, E is for seat initialized angle adjustment from $-4\sim 5^{\circ }$,D can adjust seat movement in the range of ${20}^{\circ }$, paddle B is for back movement. When seat initialized angle is $5^{\circ }$, its back angle is $89\sim {107}^{\circ }$. Paddle F is for seat slider movement with a 64.8mm's travel , in 6 locking positions.