| 摘要 |
PCT No. PCT/SE84/00077 Sec. 371 Date Oct. 31, 1984 Sec. 102(e) Date Oct. 31, 1984 PCT Filed Mar. 5, 1984 PCT Pub. No. WO84/03478 PCT Pub. Date Sep. 13, 1984.The mounting of a thruster propeller unit in the bottom plating of a vessel is facilitated by the use of lifting lines, operable from within the vessel. Each line is made to pass a lock chamber adjacent to an opening in the bottom plating, outside the opening where the thruster propeller is to be fitted. The lock chamber includes a first, rigid tubular member, which is formed as the housing for a slide valve, as well as a second tubular member, which is resilient at least in the transverse direction. The two tubular members define a passage being substantially wider than the diameter of the lifting line. The second tubular member is at its top provided with a sealing sleeve which fits around the line. The locking chamber is connected to a source of compressed air, which makes it possible to maintain a pressure within the chamber balancing the pressure of the surrounding water. |
