| 摘要 |
PROBLEM TO BE SOLVED: To perform a designated function without increasing total size and weight. SOLUTION: In a hydraulic jack extending a jack part 2 when hydraulic fluid is supplied from a hydraulic fluid supplying and discharging part 1 and contracting the lack part 2 when hydraulic fluid is collected from the jack part 2 to the hydraulic fluid supplying and discharging part 1, the jack part 2 includes a pantograph body formed in a foldable pantograph shape and a hydraulic cylinder 22 folding the pantograph body, the hydraulic cylinder 22 forms a telescopic shape which has a ram body 22b inserted in a cylinder body 22a as a lower member in such a manner that the same can rise and set and includes a rod body 22c as an upper body inserted in the ram body 22b as a cylinder in such a manner that the same can rise and set, and an upper end of the ram body 22b is linked to a lower side of the pantograph body and an upper end of the rod body 22c gets into contact with an upper end part of the pantograph body from the most folded state of the pantograph body to a state close to the most folded state of the pantograph body.
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