| 摘要 |
PURPOSE:To make the horizontal support of a machine body sure and simple as well as the support itself better in stability, by operating adjacent two jack cylinders simultaneously with one selector valve controlled. CONSTITUTION:Two oil feeding ports 28 and 29 corresponding to outrigger cylinders 12-15 and jack cylinders 8-11 are installed in first-fourth selector valves 19-22 respectively. Also a second oil feeding port 30 for each of these jack cylinders 8-11 is installed in each of selector valves 19-22. In addition, at a position (c) of a selector, two oil feeding ports 29 and 30 are interconnected with each other. And, two each of oil feeding ports 29 and 30 in each of these selector valves 19-22 are connected to each of jack cylinders 8-11 via each of interconecting duct lines 31-38 so as to feed a jack cylinder commensurate to a selector valve being set at the (c) position and adjacent one more jack cylinder with oil. |
