Snap-on, screw off cap and container neck
US5267661A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 1992 |
| Grant date | Dec 7, 1993 |
| Priority date | — |
| Expiry date | Jan 31, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D2577/205
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A tamper-evident, snap-on, screw-off closure is used with a specially shaped container neck. The neck has at least one first helical thread on an upper neck stretch portion, and at least one external ratchet tooth on a locking wall portion below the upper neck stretch portion. The closure has an upper skirt having at least one second helical thread mating with the first helical thread of the neck. A downward extending lower skirt portion includes an outer skirt portion and a shoulder extending inwardly from said outer skirt portion. A frangible section interconnects the shoulder and the upper skirt portion. At least one substantially vertical fin is formed upstanding from the shoulder, preventing upward deformation of the lower skirt portion without breaking the frangible section. The lower skirt portion has at least one internal ratchet tooth, and is formed with a line of weakness extending through the outer skirt portion and the shoulder. The lower skirt has a tear tab which, when pulled, fractures the lower skirt on a vertical line. Continued pulling on the tab sequentially fractures the frangible section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.