Conduit making machine with diameter control and method
US3940962A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 9, 1974 |
| Grant date | Mar 2, 1976 |
| Priority date | — |
| Expiry date | May 9, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21C37/128
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A machine and method for making spiral pipe from a continuous strip of sheet metal including a corrugating mill which forms corrugations in the strip and drives it through a three-roll bending mill which bends the strip into helical convolutions and guides adjacent edges thereof into an interlocking relationship and a pair of lock up rolls for crimping the interlocked edges of the convolutions into a continuous seam, which rolls are manually or automatically adjustable radially relative to the pipe axis whereby its diameter may be accurately controlled. Adjustment of said rolls radially inwardly effects a diameter increase whereas adjustment outwardly decreases the diameter of the pipe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.