Method and apparatus for doming can bottoms
US4989434A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 9, 1989 |
| Grant date | Feb 5, 1991 |
| Priority date | — |
| Expiry date | Aug 9, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D22/16
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
This invention provides method and apparatus for reshaping the bottom wall of an aluminum can body wherein a mold member having a generally cylindrical outer surface having a longitudinal axis and a contoured bottom surface is mounted for rotation in a support structure and an aluminum can body having a generally cylindrical sidewall having a longitudinal axis and an integral bottom wall is secured on the mold member so that an annular portion of the bottom wall contacts at least an annular portion of the contoured bottom surface and the longitudinal axes thereof coincide. As the mold member and the can body are rotated, resilient forces are applied to the bottom wall using a tool member having a spherical surface which is moved in a diametrical linear direction across the bottom wall to reshape the bottom wall into conformation with the contoured bottom surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.