| 摘要 |
PCT No. PCT/NO96/00290 Sec. 371 Date Jun. 22, 1998 Sec. 102(e) Date Jun. 22, 1998 PCT Filed Dec. 17, 1996 PCT Pub. No. WO97/23705 PCT Pub. Date Jul. 3, 1997A hydraulically-operated hoist is disclosed. The hoist includes a plurality of hydraulic piston/cylinder arrangements, each having an upper end. Two guide rails are disposed in parallel with the hydraulic piston/cylinder arrangements. A self-aligning yoke is connected between the upper ends of the hydraulic piston/cylinder arrangements and is raised and lowered along the two guide rails by the hydraulic piston/cylinder arrangements. The yoke comprises a beam with the two ends. An arm is connected to each end of the beam, extends obliquely upward from the beam, and terminates in a remote end rotatably connected to the upper ends of the hydraulic piston/cylinder arrangements. At least two sheaves are rotatably connected to the beam, each of which are capable of running its own wire line.
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