End closure with improved openability
US6024239A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 3, 1997 |
| Grant date | Feb 15, 2000 |
| Priority date | — |
| Expiry date | Jul 3, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D2517/5097
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
The present invention provides a stay-on-tab end closure having a displaceable tear panel defined by a frangible score with a sloping segment and a non-frangible hinge segment. A curvilinear bead is formed entirely in an exposed area of the central panel formed by a void region of the tab webbing. The nose of the tab has a generally asymmetric shaped outer edge with a second portion extending further over the tear panel toward the curvilinear transition zone of the score. The invention further provides a tab with an asymmetrical thickness, with a thickened portion adjacent the second scoreline segment, and further provides a bead segment positioned under a side portion of the tab nose adjacent the second segment of the score. The present invention also provides an end with a hinge region of the tab adapted to bend at a hinge line, the hinge line intersecting the central longitudinal axis of the tab at an oblique angle. The invention also provides a stepped profile of the panel outer edge with substantially parallel countersink walls and a chuck wall angularly extending from below the panel height.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.