Closure with high energy button
US5016769A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 9, 1990 |
| Grant date | May 21, 1991 |
| Priority date | — |
| Expiry date | Jul 9, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D79/0087
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
This relates to a conventional type of closure having a central button which is normally provided with an "up" convex state and which is movable by a vacuum within an associated container to a "down" concave state. The button, as formed, has a zero or tensile stress state with the stress state changing to a compressive stress state when the button is drawn downwardly by a vacuum within the associated container. In accordance with this invention, the button has been reformed so that it is slightly flattened and this reforming has changed the zero or tensile stress state to a compressive stress state thereby providing the button with more stored energy when it is drawn downwardly by a vacuum within an associated container. This additional stored energy provides for a greater flipping action of the button which can be utilized to operate an irreversible tamper indicating system which may be applied to the button.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.