| 摘要 |
Elastical member (4, 14) and a method to apply this into a conduit (3, 13) with an open or a closed cross-section, at which the elastical member (4, 14) adapted in the conduit is brought to exert forces at a right angle upon the walls of the conduit (3, 13), and to remove the elastical member (4, 14) from the conduit (3, 13), so that its exerting of forces upon the walls is abolished, at which a pulling force is attached in the longitudinal direction of the elastical member (4, 14) causing an increased stress by which a tension will be caused in its longitudinal direction and a contraction will be caused in its cross-direction, so that the cross-section of the elastical member (4, 14) will be smaller than the cross-section of the conduit (3, 13), and by which the elastical member (4, 14) can be brought into, respectively out from the conduit (3, 13) with no or a low friction against the walls of the conduit (3, 13). |
