Method for mechanically expanding elliptical tubes
US5604982A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 1995 |
| Grant date | Feb 25, 1997 |
| Priority date | — |
| Expiry date | Jun 5, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/53122
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An elliptical cross section tube of novel construction that is capable of being expanded by a conventional conical tool of the type used to expand round cross section tubes. The tube is also reinforced by integral internal webs. The unexpanded tube cross section has concave lengthwise channels and concave internal webs that are all internally tangent to a circle representing a cross section of the expansion tool's conical head. As the head of the tool is pushed through the tube, it pushes the channels out into the fin hole while flattening the webs. The tube is thus mechanically bonded to the tube, and is left with a pair of internal reinforcing webs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.