| 摘要 |
<p>The flexible hose has -shaped threads(1) which consist of flat projecting parts (1A), flat roots of threads (1B) and slopes (1a) vertical to the axis of the hose which bear the cylindrical stress. Internal grooves are shut down with strip materials (3) to provent the edges of the grooves from being worn out while fluid flows inside the hose. Strip materials are laid one upon another in some range so that the internal grooves remain shut when the hose is elongated or contracted.</p> |
