| 摘要 |
A pneumatic spring for use in absorbing an external force by compressing gaseous fluid trapped therein. The pneumatic spring includes internal valves for recharging and for relieving excessive pressure. In one form, the pneumatic spring comprises an outer housing defining an open-ended outer cylinder and an inner cylinder slidingly and sealingly positioned in the outer cylinder. The inner cylinder has a cylindrical side wall and end walls and a rod extends from the inner end wall of the outer cylinder through the inner end wall of the inner cylinder. A piston is fixed on the rod within the inner cylinder, thereby defining a first chamber between the inner end of the outer cylinder and the inner end wall on the inner cylinder and a second chamber between the piston on the rod and the outer end wall of the inner cylinder. The chambers are isolated from one another. Gaseous fluid under pressure is provided to each of the chambers independently of the other whereby when a force is applied to move the inner cylinder axially inwardly of the outer cylinder, the pressures in the two chambers are built up independently of one another. In another form, the pneumatic spring comprises an open-ended outer cylinder and an open-ended inner cylinder slidingly and sealingly positioned within the outer cylinder with the valves in the end wall of the outer cylinder.
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