| 摘要 |
A saw-teeth type hydraulic jack 1000 according to the present invention has a cylinder body 100 in which a hydraulic pressure room 300 is provided and a stand 10 which stands the cylinder body 100 to be inclined to a base. A spool valve 500 is mounted on the hydraulic pressure room 300. A movable holding member 40 is connected to a rod 540 of the spool valve 500 and an opposite holding member 60 is provided in the cylinder body 100 to the opposite side. A plurality of teeth 41 and 61 is formed on the movable holding member 40 and the opposite holding member 60 in their ends. The teeth 41 and 61 have a shape of saw-teeth and each of line connecting the teeth 41 and 61 forms circular arcs S1 and S2, respectively. |
