| 摘要 |
PCT No. PCT/SU84/00058 Sec. 371 Date Jun. 26, 1986 Sec. 102(e) Date Jun. 26, 1986 PCT Filed Nov. 2, 1984 PCT Pub. No. WO86/02624 PCT Pub. Date May 9, 1986.A hoisting apparatus comprising a hydraulic cylinder (1) a piston (3) whereof is connected to a load-handling attachment via a pliable member (6) which passes through a sealing device (9) that is located outside the cylinder (1) and consists of two consecutively arranged chambers (10, 11) separated by seals (12, 13, 14). The chamber (10) next to the cylinder space is filled with a sealing fluid whose viscosity is higher than the viscosity of the hydraulic fluid and the other chamber (11) is connected to a separator (18) adapted to separate the hydraulic fluid from the sealing fluid and to feed them to the space (4) of the hydraulic cylinder and the chamber (10) of the sealing device (9), respectively. |
