Closure mechanism with gas seal

Details Closure mechanism with gas seal Closure mechanism with gas seal

1987-11-25

1989-08-29

McDowell, Robert

Dispensing

Molten metal dispensing

Flow controllers or assists

164437, 222606, 295332, B22D 4108

Patent

active

RE0330361

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.

REFERENCES:
patent: 3502134 (1970-03-01), Orehos
patent: 3651825 (1972-03-01), Sury
patent: 4290589 (1981-09-01), Luhrsen et al.
patent: 4429816 (1984-02-01), Thrower
patent: 4456157 (1984-06-01), de Jong

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