Method and apparatus for deforming reformable tubular pipe liners
US4863365A · kind A · utility
35Cited by
5References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 27, 1987 |
| Grant date | Sep 5, 1989 |
| Priority date | — |
| Expiry date | Jul 27, 2007 |
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 juxt posing 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.