| 摘要 |
PURPOSE:To be well suitable for a positioning and support member, by a method wherein the pressure accumulating chamber of an accumulator is connected to an oil chamber on the contraction side of a rod through a first check valve and to an oil chamber on the expansion side of a rod through a second check valve. CONSTITUTION:Since, when first and second check valves 10 and 12 are opened by means of a lever 24, a pressure accumulating chamber 6 is communicated to an oil chamber 11 on the contraction side of a rod and an oil chamber 13 on the expansion side of a rod, a rod 3 is moved to the expansion side or the contraction side according to an external force applied. In this case, according to the difference in a collection area of a piston 2, the oil chamber of the pressure accumulating chamber 6 is exerted as an assist force on the expansion side of a rod. With the first and second check valves 10 and 12 closed by means of the lever 24 after the rod 3 is moved to an arbitrary position, the oil chamber 11 on the contraction side of a rod and the oil chamber 13 on the expansion side of a rod are shut off and brought into a locked state, and thereby the rod 3 is secured to an arbitrary position. |
