| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an elevating device capable of suppressing the generation of dust.SOLUTION: An elevating device includes: a piston rod; a first piston 11 fixed on an outer periphery of the piston rod; a first cylinder tube 12 for defining a first pressure chamber R1 above the first piston 11; a second piston 21 coupled to an upper end of the first cylinder tube 12; a second cylinder tube 22 for defining a second pressure chamber R2 above the second piston 21; a first communication hole 3a for communicating a lower end side of the piston rod and the first pressure chamber R1; a second communication hole 21a for communicating the first pressure chamber R1 and the second pressure chamber R2; and a work supporting portion 50. When water pressure is supplied to the first pressure chamber R1, the water pressure is supplied to the second pressure chamber R2, and with the expansion of the second pressure chamber R2, the second cylinder tube 22 is elevated. When the second cylinder tube 22 is elevated to an elevation end, the first cylinder tube 12 and the second cylinder tube 22 are elevated with the expansion of the first pressure chamber R1.</p> |
