three， free to stop gas spring (friction type air spring， air spring) is mainly used in the kitchen furniture， medical equipment and other fields. among the characteristics between the free type gas spring and lockable gas spring it: any position and can not stop at the stroke of external structure of any need 求购压簧， but no additional locking force. mainly through the controller (or pull handle) to achieve the effect of. can also be achieved through the expansion of the piston rod. when usinvalid.

六、阻尼器（damper）在汽车和医疗设备上都用得比较多，其特点是阻力随着运行的速度而改变。可以明显的对相连的机构的速度起缓冲作用。阻尼器主要用于起缓冲作用 压簧，它的大特点是气弹簧的力随着运动速度的变化而变化。当引导气弹簧的力的作用点运动的比较快时期弹簧的阻力就明显增大，而当作用点运动很慢时，阻力则几乎没有。阻尼器主要应用在洗衣机、电冰箱

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