| 摘要 |
A propeller assembly (2), a so-called thruster, intended to be fitted to an opening (7) in a bottom part (1) of the shell structure of a watercraft, for example an offshore-platform, is provided with a mounting flange (9) which can be connected in a pressure tight fashion to the shell structure around the opening (7). To enable the assembly to be fitted and dismantled from outside the shell structure and beneath the surface of the water on which the craft floats without requiring the assistance of a diver there are used a plurality of lines (12) which can be connected to lifting devices in the watercraft and passed out through a corresponding number of line openings (13) located in the shell structure on one side of the assembly mounting opening (7), so that the ends of the lines can be connected to the line attachments (16; 37) on the assembly (2). These line attachments (16; 37) are so arranged on the mounting flange (9) of the assembly (2) that when the assembly is mounted and the mounting flange (9) connected to the shell structure (1) they are located in the line openings (13) and are accessible from inside the shell structure (1), thereby enabling the lines (12) and the line attachments (16; 37) to be mutually connected from inside the watercraft. The line attachments (16; 37) are provided with seal apparatus (18; 38) which, when the propeller assembly is mounted in position, close the line openings (13), while on the inside of the shell structure (1) adjacent each line opening (13) there is provided a sealing chamber (14,20; 47a, 47b) which surrounds the line opening and which is provided with a sealing lead-through for the line (12). |
