| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a hydraulic operation device allowing confirmation of the state of liquid pressure from the outside without increasing points requiring airtightness of a liquid, that is, without increasing the probability of leakage of the liquid. <P>SOLUTION: This hydraulic operation device is provided with: a high-pressure accumulator 9 for accumulating a high-pressure liquid for operating a driving piston of the hydraulic operation device connected to a switching part 1 of a breaker; a cylindrical conical spring group holding force for always keeping the liquid pressure in the accumulator 9 at high pressure by acting on a stored- energy piston 11 in the accumulator 9; and a spring stored-energy movable plate 12 gearing with the stored-energy piston 11 between the stored-energy piston 11 and the spring group 16. The device is so structured that a pointing needle 17 is fixed to the movable plate 12 and the pointing needle 17 points a separately installed indication plate 18 with the state of the liquid pressure described. <P>COPYRIGHT: (C)2003,JPO</p> |
