Apparatus for preventing air from contacting molten metal during discharge through a sliding closure unit
US4576317A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 2, 1984 |
| Grant date | Mar 18, 1986 |
| Priority date | — |
| Expiry date | Aug 2, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D41/28
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A sliding closure unit includes at least two refractory plates having therethrough discharge openings, the plates abutting on respective planar sliding surfaces. A generally U-shaped recess is formed in each sliding surface, each recess including a pair of free arms extending toward the other recess. The recesses are dimensioned such that, when the plates are in the open position thereof, the arms of the recesses overlap, thereby forming a connected recessed area encircling the discharge openings. One of the plates has therethrough a channel opening into the recessed area and adapted to be connected to a vacuum source, thereby making it possible to prevent air from contacting molten metal being discharged through the discharge openings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.