Stopper rod

Metallurgical apparatus – Means sealing or opening aperture in vessel – By means plugging aperture

Reexamination Certificate

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Details

C222S597000, C222S602000

Reexamination Certificate

active

06913730

ABSTRACT:
There is provided a refractory mono-block stopper of substantially cylindrical configuration having an upper end, a lower end and an axial bore extending downwardly from the upper end, means being provided in the axial bore at a distance d from the upper end for attachment of the stopper to a lifting mechanism, the stopper being divided into three portions (A,B,C); a first portion (A) extending from the upper end towards the lower end until a distance greater than d, a second portion (B) extending from the first portion (A) towards the lower end and a third portion (C) extending from the second portion (B) and comprising a stopper nose ending at the lower end of the stopper. The stopper of the invention is characterized in that the average section of the second portion (B) is lower than the section of the first portion (A) and the highest section of the third portion (C) is higher than the lowest section of the second portion (B).The stopper of the invention has a significantly reduced weight without any observable loss of strength. It is also noted that since the profile of the stopper can be kept symmetrical around its axis, the stopper does not require extra handwork to be removed from the mold.

REFERENCES:
patent: 4610436 (1986-09-01), LaBate et al.
patent: 4706944 (1987-11-01), Lee
patent: 5024422 (1991-06-01), Fishler
patent: 5259596 (1993-11-01), Ruffaldi
patent: 0625391 (1994-11-01), None
patent: 1 160 030 (2001-05-01), None
patent: 2210305 (1989-06-01), None

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