| 发明名称 |
Pipe bell end having a thickened portion and apparatus for forming the bell end |
| 摘要 |
A bell end on a pipe of thermoplastic material has variable wall thickness in the axial direction, the maximum being where the inner wall acts as a sealing face. The bell end can be formed by upsetting the pipe wall into the cavity between a mandril and a shaping sleeve.
|
| 申请公布号 |
US4006757(A) |
申请公布日期 |
1977.02.08 |
| 申请号 |
US19750607770 |
申请日期 |
1975.08.26 |
| 申请人 |
POLVA NEDERLAND B.V. |
发明人 |
ACDA, PETRUS MARINUS;KARREMAN, JACOB |
| 分类号 |
B21D41/02;B21D19/00;B29C57/02;F16L9/00;F16L9/12;F16L21/02;F16L47/10;(IPC1-7):F16L9/00;F16L11/00 |
主分类号 |
B21D41/02 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
|
| 地址 |
|
