Molded plastic tamper-proof cap with pull ring and tearable membranes
US4320861A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 12, 1980 |
| Grant date | Mar 23, 1982 |
| Priority date | — |
| Expiry date | May 12, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D47/061
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A tamper-proof cap for a container closure device for providing a visual indication of any tampering and tampering attempts with the container closure device includes an annular body portion, a pull ring portion detachably joined to the annular body portion, a tear-out strip portion joined to the pull ring portion and a pair of connecting membranes disposed between the tear-out strip portion and the annular body portion. The annular body portion includes an enclosing wall, an inwardly extending lid section joined to a top edge of the enclosing wall, and an outwardly extending lip section joined to a second opposite edge of the enclosing wall. The inwardly extending lid section is annular in shape and defines a center opening. The pull ring portion is detachably joined to the inner edge of this center opening by three reduced-thickness membrane sections which can be easily torn under nominal manual force. The connection between the pull ring portion and the tear-out strip portion remains intact, yet as additional force is applied upwardly and outwardly on the pull ring portion in the direction of this tear-out strip portion, the connecting membranes begin to tear thereby separating …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.