Closure system with extendable tamper band bonded to container
US4844272A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 28, 1988 |
| Grant date | Jul 4, 1989 |
| Priority date | — |
| Expiry date | Nov 28, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/7158
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A closure system includes a container and a closure comprising a cap having a cylindrical skirt with internal threads, an annular tamper band having an inside diameter larger than the outside diameter of the skirt forming an annular gap therebetween, and flexible bridges joining the tamper band to the free end of the cap skirt. The bridges have angularly spaced end segments extending radially outward and radially inwardly from the skirt and tamper band respectively, and an intermediate segment extending arcuately around the gap between the end segments. The closure is integrally molded with the bridges and tamper band extending radially outward in a common plane transverse to the central axis of the cap. The bridges flex to allow axial extension of the tamper band for bonding to a shoulder or transfer bead on the container. Unscrewing of the cap fractures the bridges, preferably at a section of reduced cross-section provided by notches at the intersection of the bridges with the cap skirt. The set of the resilient bridges causes them to spring against the container shoulder or transfer bead upon fracturing to provide a positive visual indication of opening or tampering with the clo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.