| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a hydraulic jack that can appropriately prevent the jet of hydraulic operating fluid. <P>SOLUTION: The hydraulic jack is configured to put an upper rod 5 into/out of a lower rod 5 by changing the amount of the hydraulic operating fluid to be supplied into the lower rod 5. In this hydraulic jack, an oil storing notch part 22 is formed to be recessed outside along an upper edge of an inner peripheral surface of the lower rod 5, and the hydraulic operating fluid adhered to an outer peripheral surface of the upper rod 5 is stored in the oil storing notch part 22 of the lower rod 5, and the stored hydraulic operating fluid can seal a gap 23 between a cylinder part 8 of the lower rod 5 and a cylinder part 8 of the upper rod 5. Consequently, when extending and shrinking the hydraulic jack 1, the hydraulic operating fluid stored in the oil storing notch part 22 can prevent the jet of the hydraulic operating fluid, which stays inside the rod 5, upward through the gap 23, and the periphery of the hydraulic jack 1 can be kept clean. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
