| 摘要 |
PROBLEM TO BE SOLVED: To prevent a saddle receiving the load from a supported body from being simply separated and dropped from the upper end face of an upper end bracket and to permanently guarantee its reutilization. SOLUTION: The saddle 3 is held by the upper end bracket 25 forming the upper end section of a jack section 2 extended when pressure oil is fed from a pressure oil feed/discharge section 1 and shrunk when the fed oil is recovered into the pressure oil feed/discharge section 1. A jack point A1 formed on the lower end face of the supported body A is faced to a guide groove formed on the upper end face of the saddle 3. The saddle 3 is cast into a block having a truncated pyramidal shape so that the area of its lower end face is made larger than the area of the upper end face.
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