| 摘要 |
<p>PURPOSE:To reduce a shock caused by lowering the title device and stopping at a desired position, by absorbing the shock with a resilient oil hose provided between an oil hydraulic pump and an oil hydraulic cylinder. CONSTITUTION:When top plate 1 of the title device is lowered, electromagnetic valves 7 and 8 are opened while an oil hydraulic motor 5 remains inactive. A piston of a single action oil hydraulic cylinder 4 is pressed down under the weight of the top plate 1, etc., and oil in the hydraulic cylinder 4 is flowed through the electromagnetic valve 7, an oil hose 6 and the other electromagnetic valve 8 to an oil tank (not shown in a figure). The top plate 1 is then stopped to rest at a desired position by closing the electromagnetic valve 8. Since oil flow in the hose 6 near the electromagnetic valve 7 does not suddenly but slowly stops owing to the elasticity of the hose 6, the top plate 1 is gently stopped and a shock to a body lying on the top plate 1 is thus lessened.</p> |
