Method and apparatus for forming drum closure
US4972568A · kind A · utility
9Cited by
3References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 1, 1989 |
| Grant date | Nov 27, 1990 |
| Priority date | — |
| Expiry date | Aug 1, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49986
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method for forming a threaded dispensing opening for a cylindrical drum container having a generally flat circular closed bottom, a generally flat circular closed top, and a cylindrical side wall comprising the steps of forming an aperture in the drum top and drawing the drum metal adjacent the aperture upwardly to define an upwardly extending annular shoulder. The shoulder is then compressed downwardly to thicken the shoulder and a female threaded portion is formed on the inside of the annular shoulder which is receptive of a threaded closure member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.