Method and apparatus for forming container end panels
US4713958A · kind A · utility
57Cited by
8References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1986 |
| Grant date | Dec 22, 1987 |
| Priority date | — |
| Expiry date | Oct 30, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D51/44
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method of forming container end panels includes first forming the bottom outer panel and then preliminarily forming the chuckwall and countersink radius by pulling material from the peripheral edge area with a punch core. The countersink radius is finally formed by partially retracting the punch core from the radius while holding the chuckwall to wrap some of the material in the radius upwardly. The apparatus includes an outer punch core with a tapered nose which preliminarily forms the chuckwall and countersink radius and then is retractable from the radius while holding the wall during final forming of the radius.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.