Method and apparatus for deforming reformable tubular pipe liners
US5342570A · kind A · utility
34Cited by
9References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 9, 1990 |
| Grant date | Aug 30, 1994 |
| Priority date | — |
| Expiry date | Aug 9, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C63/343
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method producing deformed pipe liners from continuously extruded thermoplastic material by collapsing and bending deformable portions of the tube toward a back-up portion thereof and without elongation to maintain diameter and wall thickness, and apparatus to carry out said method and characterized by at least one back-up roller and at least one shaping roller folding the deformable portion along a line of symmetry and juxtaposing a fold of the tube to the back-up portion, all at raised temperature followed by reduced temperature on a rail conforming to the deformed tube configuration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.