Opening for injecting a protective gas into a casting tube
US4519438A · kind A · utility
6Cited by
1References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 13, 1983 |
| Grant date | May 28, 1985 |
| Priority date | — |
| Expiry date | May 13, 2003 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF27D3/16
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A casting tube 8 of a refractory material comprises at its upper end a series of openings for the injection of a protective gas, for example argon, to create an atmosphere which protects the incoming molten metal against oxidation and cools the walls of the casting tube. The injection openings are grooves 11 formed in an upper frustoconical part of the casting tube, whose outer surface defines a fixing collar. These grooves are interconnected by an annular passage 12.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.