Method of manufacturing lateral header extensions
US4680845A · kind A · utility
11Cited by
2References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 31, 1986 |
| Grant date | Jul 21, 1987 |
| Priority date | — |
| Expiry date | Jan 31, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49446
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An aluminum header tube having a plurality of integral and regularly spaced lateral extensions is formed according to a method which includes the steps of forming stubs for the extensions, inserting a tool through each stub and into the interior of the header tube, sizing each stub to reduce its inside and outside diameter and, while maintaining the clamp, withdrawing the tool through the stub to cause metal to flow outwardly, thus raising or lengthening the stub to the desired degree.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.