Method of making a spanner
US9463503B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Dec 23, 2014 |
| Grant date | Oct 11, 2016 |
| Priority date | — |
| Expiry date | Jan 23, 2035 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21K5/16
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method of making a spanner comprises the steps of preparing a flat metal blank, forging and pressing a part of the metal blank to form a head and a shank whose width is smaller than a width of the head, pressing the head to form a first arch-shaped part, pressing a shank end of the shank to expand the shank end and then form a second arch-shaped part, and pressing the head and the shank end again to remove redundant scrap projecting from the first arch-shaped part and the second arch-shaped part and also punch finished holes in the head and the shank end respectively, thereby completing the finished spanner. Accordingly, the method reduces the waste of the material and the processing cost, decreases the use frequency of high-cost machines and promotes the processing efficiency by using the flat metal blank.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.