Closure mechanism with gas seal

USRE33036E · kind E · reissue

Assignees

• Didier-Werke AG · DE
• Voest-Alpine · AT

Inventors

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

Key dates

• Filing date: Nov 25, 1987
• Grant date: Aug 29, 1989
• Expiry date: Nov 25, 2007

Classification

• Technology area (CPC —): General

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.