| 摘要 |
<p>An air hoist comprising a support member, which houses a bolt and carries a fixed nut screwing onto the bolt through balls, a piston rotatably fitted in the support member through a seal, a drum-cylinder which is slidably put on the piston with another seal therebetween and forms a pressure chamber between its head and the piston, and a passage through which pressurized fluid is introduced and discharged from the pressure chamber, whereby the drum-cylinder rotatingly advances by the action of the bolt-nut-ball assembly to take up the wire rope when the pressurized fluid is introduced into the pressure chamber, and reversingly retreats, under the influence of the self-weight of the load, to pay off the wire rope when the pressurized fluid is discharged therefrom.</p> |
