Patent · US Expired

Closure mechanism with gas seal

US4555050A · kind A · utility

11Cited by

4References

8Claims

0Family size

Assignees

Didier-Werke AG · DE
Voest-Alpine · AT

Inventors

Bernhard Schiefer · Pickering, CA
Herbert Bumberger · Linz, AT

Key dates

Filing date	Jul 8, 1983
Grant date	Nov 26, 1985
Priority date	—
Expiry date	Jul 8, 2003

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB22D41/502
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

A closure mechanism includes a conical discharge nozzle and a shielding tube fitted over the exterior of the discharge nozzle. A snug conical joint is formed by closely complementary conical surfaces of the discharge nozzle and the shielding tube. At least one ring-shaped seal is provided in such joint to prevent exterior air from entering between the discharge nozzle and the shielding tube into the interior of the shielding tube. The ring-shaped seal comprises an annular recess formed in one of the conical surfaces, thereby defining an annular chamber, and an inert gas filling such chamber.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.