| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a multi-stage hydraulic jack constituted to generate high axial force by joining pressure receiving forces of pistons by arranging the plurality of pistons in series. <P>SOLUTION: An intermediate reaction force wall is mounted on an intermediate position in a cylinder, the pistons are mounted one-by-one on a plurality of cylinder chambers partitioned by the intermediate reaction force wall, a piston rod of one piston is penetrated through the intermediate reaction force wall to be connected with the other piston, a piston rod of the other piston is projected outside of the cylinder as an output shaft, an injection nozzle is mounted on a side wall of the cylinder to supply pressure fluid to a rear face of the piston to advance the piston, and further a second injection nozzle is mounted to supply the pressure fluid to a front face of the piston to retract the piston. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
