Tamper-evident cap having plural diameters
US4815620A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 25, 1987 |
| Grant date | Mar 28, 1989 |
| Priority date | — |
| Expiry date | Sep 25, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D2401/35
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A plastic cap for a container neck formed with upper and lower external locking beads has a top disk from which depends an upper outer skirt having an upper internal locking bead and a larger diameter lower skirt having a lower internal locking bead. Between the skirt sections is an outward extending flange which is weakened by a notch cut in its outer corner to form a circumferential line of weakness. When the cap is seated on the neck the upper and lower beads inter-engage, the cap cannot be removed without evidence of tampering. To fracture the flange at the line of weakness, in one form of the invention, a tear tab depends from the lower edge of the skirt and a curved score line at the upper end of the tear tab extends up from the lower edge of the skirt to the level of the line of weakness. Pulling the tab tears the skirt at the curved score line and around the line of weakness, removing all or a sufficient portion of the lower skirt and its lower internal locking bead. In another form of the invention, a tear tab connected to the lower skirt extends upward, displaced outward of the lower skirt and the latter is weakened in a substantially vertical score line extending up from…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.