Method of manufacturing rectangular tube having stepped portion
US9757789B2 · kind B2 · utility
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13References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 28, 2014 |
| Grant date | Sep 12, 2017 |
| Priority date | — |
| Expiry date | Jun 11, 2034 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21K21/12
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method of manufacturing a rectangular tube having a stepped portion includes: forming V-shaped grooves on a rectangular tube at surfaces of an end thereof in a direction parallel to a longitudinal direction thereof; and pressing each of the surfaces having the V-shaped grooves formed thereon from outside to inside, whereby the end of the rectangular tube is radially reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.