Tamper-evident rotor top
US5161713A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 23, 1991 |
| Grant date | Nov 10, 1992 |
| Priority date | — |
| Expiry date | Apr 23, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D47/265
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A tamper-evident end closure for dispensers, including a hermetically sea base, a rotor having a normally occurring unrestrained non-flat shape, and a rotatable connection between the rotor and the base to hold the rotor on the base in a substantially flat condition so it can rotate. The rotatable connection is achieved by employing an annular attachment ring, formed on the rotor snap-fit into an annular groove molded into the base. The annular attachment ring is connected to the rotor by a frangible web, which will break or tear when an attempt is made to separate the rotor from the base. Because the rotor is formed with a normally occurring non-flat shape, tearing or breaking of the frangible web will allow a portion of the rotor, normally held by the attachment ring, to spring or bend toward its natural shape. This unrestrained portion provides striking evidence of the tampering attempt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.