Tamper evident closure with tear out tab integrally molded without slides
US4986430A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 29, 1990 |
| Grant date | Jan 22, 1991 |
| Priority date | — |
| Expiry date | May 29, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D41/3428
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A tamper evident closure is integrally molded in a straight draw mold with a tear out tab extending laterally outward adjacent a slot in the free edge of the closure skirt and connected to the skirt by flexible, frangible bridges. After the closure is removed from the straight draw mold, the tear out tab is rotated about the flexible, frangible bridges into the slot and is retained therein by bevelled engagement ribs along the side edges of the tear out tab which snap over and engage the side edges of the slot. A radially inwardly directed projection on the tear out tab engages the conventional transfer bead on a container, and remains engaged thereby as the closure is unthreaded, thus, producing an axial force which fractures the bridges. The tear out tab then slides free of engagement with the edges of the slot and separates leaving a visual indication of prior removal of or tampering with the closure. If an attempt is made to reinsert the tear out tab in the slot, the torn ends of the fractured bridges extend laterally outward to provide an indication of the tampering.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.