| 摘要 |
<p>The stud (1) has three symmetrical trapezoidal screw threads (6) provided adjacent to a right or left propeller, where the diameter of the stud is lower than thirty millimeters. A coating e.g. epoxy painting, enables sliding against the screw threads. The length of a tapping (2) of a pile section (3) is greater than the length of the stub, where the pile section axially emerges from a right of a transversal support surface (4). An independent claim is also included for an assembly formed by a stud and two pile sections.</p> |
