| 摘要 |
PURPOSE:To arbitrarily set a rod by forcibly opening and closing a relief valve by means of a lever, by a method wherein the pressure accumulating 6 chamber of an accumulator is connected to the oil chamber on the contraction side of the rod of a cylinder body, end is connected to an oil chamber on the expansion side through a relief valve opened at a set value or more. CONSTITUTION:A cylinder body 1 is partitioned into an oil chamber 5 on the expansion side and an oil chamber 4 on the contraction side by means of a piston rod 3. The gas chamber, filled with a gas pressure, of an accumulator 9 is partitioned from a pressure accumulating chamber 11 by means of a free piston 10. The pressure accumulating chamber 11 is communicated with the oil chamber 4 on the contraction chamber of the rod, and when the oil pressure of the oil chamber 5 on the expansion side of the rod is increased to a value higher than a given oil pressure, the oil chamber 5 on the expansion side is connected to the pressure accumulating chamber 11 through a relief valve 14 opened against the force of a spring 19. The relief valve 14 is formed such that it is forcibly opened through control of a lever 24. This constitution enables setting of the rod to an arbitrary position, and permits absorption of an overload even when the rod is present at either of the expansion side and the contraction side. |
