Steel drum
US4921116A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1988 |
| Grant date | May 1, 1990 |
| Priority date | — |
| Expiry date | Sep 13, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S72/715
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A high strength metallic drum is disclosed having an high internal volume for given external dimensions. The drum is divided into annular top, middle and bottom drum sections. Each drum section has a constant diameter, with the diameters of the top and bottom drum sections being larger than the diameters of the middle drum section. A pair of swedge rolling hoops are provided at the boundaries between adjacent sections to give the drum rigidity. A first one of the rolling hoops joins the top and middle sections while the second rolling hoop joins the middle and bottom sections. Each swedge rolling hoop has a gripping surface that extends outwardly from the middle drum portion to facilitate handling the drum. The maximum diameters of the swedge rolling hoops are larger than the diameters of each of the sections they join. In a preferred 55 gallon drum embodiment, the top and bottom sections have the same diameter and the swedge rolling hoops are mirror images of each other. The maximum diameter of the swedge rolling hoops are in the range of three quarters of an inch to one inch greater than the diameter of the middle drum section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.