| 摘要 |
<p>The support comprises an outer tube fixed to the platform, a cylinder tube inside the outer tube which is also fixed to the platform, a hydraulic hose connected to the cylinder tube, an inner tube movably mounted inside the outer tube, a compression spring between the cylinder tube and inner tube for applying a downward force to the latter and a piston rod inside the cylinder tube for pushing the inner tube upwards when the hydraulic hose is pressurized. The inner tube is raised relative to the outer tube when the pressure in the hose is increased and lowered when the pressure is reduced.</p> |
