| 摘要 |
PROBLEM TO BE SOLVED: To provide a jack device compactly formable in low bulk, reducing cost, and easy in maintenance, in the jack device used for a press machine requiring a high speed in low thrust and high thrust at a low speed, and using a two-way delivery type pump means, that is, a direct drive volume control (DDV) system fluid source without using a power unit composed of a pump and a control valve. SOLUTION: This jack device is composed of a double cylinder 2, a first valve means 3, a second valve means 4 and a two-way delivery type pump means 5. Large and small two cylinders A and B are particularly formed as the double cylinder 2 by double combining the inside and outside. The two-way delivery type pump means 5 is singly formed by arranging the first valve means 3 and the second valve means 4, and the first and second valve means 3 and 4 are arranged in an external part of the double cylinder 2. COPYRIGHT: (C)2007,JPO&INPIT
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