Twist open closure having inclined frangible membrane
US8016159B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 7, 2008 |
| Grant date | Sep 13, 2011 |
| Priority date | — |
| Expiry date | Apr 19, 2030 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D2251/023
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A closure for a container having an opening includes a base cap and an overcap that form a chamber adjacent the opening which is sealed from the contents of the container by a frangible membrane having an inclined line of weakness and by a hinge member having a pocket extending downward adjacent lower and upper terminuses of the line of weakness. The overcap includes a cutting member received within the pocket that severs the line of weakness upon substantial rotation of the overcap with respect to the base cap. A pushing member may cooperate with a cam member to deflect open the membrane upon severance. The pocket may include a stop for the cutting member. The base cap may include a cylindrical structure having an upwardly inwardly projection member to form a seal with an thickened upper portion of the overcap skirt to protect against penetration into the chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.