Method and device for producing a pipe
US8763250B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 13, 2007 |
| Grant date | Jul 1, 2014 |
| Priority date | — |
| Expiry date | Oct 26, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49398
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a method for producing a pipe (1) which is provided in its wall (2) and between its ends with at least one channel (4) which passes through the wall (2), in which method a plastic pipe preform (16) is blow-moulded, wherein a protrusion (17) is provided for the channel (4), this protrusion lining the pipe preform (16) and having inside dimensions which are larger than the outside dimensions of the channel (4), in which method the pipe preform (16) in its as yet unsolidified state is squashed in the region of the protrusion (17) in such a way that a rough channel (21) communicating with the interior (3) of the pipe (1) is formed for the channel (4), this rough channel being closed at its end remote from the interior (3) of the pipe and having, apart from the desired channel length (7), the outside dimension of the channel (4), and in which method the squashed pipe preform (16) in its solidified state is cut in the region of the rough channel (21) in such a way that the channel (4) is then open and has the desired channel length (7).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.