| 发明名称 |
Method of manufacturing helically wound tubes and tubes manufactured by said method |
| 摘要 |
A typical embodiment of the invention produces helically wound tubes from strips of thin plate in which adjacent edges are provided with interlocking ribs that are folded over to form a compressed bead. A further rib is formed at the bead, the bead providing one of the sides of the new-formed rib.
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| 申请公布号 |
US4481978(A) |
申请公布日期 |
1984.11.13 |
| 申请号 |
US19790054479 |
申请日期 |
1979.07.03 |
| 申请人 |
WESTAFLEX-WERK L.U.F. WESTERBARKEY GMBH & CO. |
发明人 |
ESCANDELL, MANUEL |
| 分类号 |
B21C37/12;F16L11/16;(IPC1-7):F16L11/00;B21D39/03;B23P11/00 |
主分类号 |
B21C37/12 |
| 代理机构 |
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| 主权项 |
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