| 摘要 |
A telescopic pneumatic device includes an outer cylinder, an inner cylinder disposed in the outer cylinder and having a cylinder wall defining a gas chamber, a piston mounted in the gas chamber, a piston rod connected to the piston, two flow passages formed in the cylinder wall, and a control valve operable to allow or interrupt fluid communication between a gas-controlling chamber section and a piston-receiving chamber section of the gas chamber. The inner cylinder is made of a rigid plastic material.
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