| 摘要 |
A wheeled vehicle includes a cylinder having a receiving chamber, a retractable piston rod movably mounted on the cylinder to support a bearing seat, and an anti-reverse safety device mounted on the cylinder to provide an anti-reverse effect to the cylinder. Thus, when the piston rod is pressed downward, the anti-reverse safety device provides an anti-reverse effect to the cylinder to prevent the fluid in the receiving chamber of the cylinder from flowing backward, so that the bearing seat is fixed at a normal position without being lowered down accidentally.
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