Plastic drum closure
US5971189A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 23, 1997 |
| Grant date | Oct 26, 1999 |
| Priority date | — |
| Expiry date | Jun 23, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D39/084
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A closure assembly for a shipping and storage drum where the drum includes an internally threaded plastic outlet for receipt of the closure assembly includes a plastic closure having a generally cylindrical main body portion which is externally threaded and which constitutes the leading edge of threaded engagement into the outlet. Disposed at the upper end of the main body portion and integral therewith is an annular, peripheral flange the underside of which is shaped with an annular groove which is designed to receive an elastomeric gasket. The annular groove has an outwardly inclined outer wall and a generally cylindrical inner wall. The gasket is held in position as part of the closure by an interference fit between the inside surface of the gasket and the inner cylindrical wall of the groove. The plastic outlet of the shipping and storage drum includes a generally cylindrical raised rib and outward thereto and concentric therewith a generally cylindrical raised wall. Upon full threaded engagement of the closure into the outlet, the raised rib presses into the central area of the elastomeric gasket and the upper surface of the closure is seated within the raised wall and is belo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.