Method for forming a plastic pipe
US3991150A · kind A · utility
10Cited by
2References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 20, 1975 |
| Grant date | Nov 9, 1976 |
| Priority date | — |
| Expiry date | Nov 20, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C57/045
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention relates to a method for providing a thermoplastic pipe with an inner groove, by subjecting a heat plasticized pipe to the action of some rotatably supported deforming rollers which are expanded and rotated by means of a mandril. A relative rotating motion between said deforming rollers and the pipe is maintained until the pipe is no longer permanently deformable and the relatieve rotating motion is maintained to strengthen the walls of said groove.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.