Formation of a curl in a unitary closable container
US7942028B2 · kind B2 · utility
19Cited by
18References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 16, 2008 |
| Grant date | May 17, 2011 |
| Priority date | — |
| Expiry date | Dec 27, 2029 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D19/12
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Disclosed is a device and method for forming a curl in a closable container. A process of forming a pre-curl is used, which is followed by a second separate step of forming the completed curl. The two-step process provides for higher tolerances with respect to the shape of the curl that allows the curl to be used as a sealing surface for a recloseable metal bottle. A three-step process provides for even greater tolerances and reduces longitudinal forces by completing the curl using lateral forces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.