Stopper rod

Details Stopper rod Stopper rod

2011-06-14

2011-06-14

Kastler, Scott (Department: 1733)

Metallurgical apparatus

Means for melting or vaporizing metal or treating liquefied...

With means to discharge molten material

C222S602000

Reexamination Certificate

active

07959853

ABSTRACT:
Stopper rod having an elongated body of refractory material, a passageway extending longitudinally in the body from an end thereof which is uppermost in use, a carrier rod having a part fixedly received in the passageway and a further part outside of the passageway for attachment to a lifting device for the stopper rod. The passageway has an enlarged part which defines a sealing surface spaced from the end of the body, an insert around the carrier rod having at least a part thereof received in the enlarged part, a retention element on the carrier rod, and an expandable element disposed between the insert and the retention element. The material of the insert has a co-efficient of thermal expansion no greater than that of the carrier rod. Expansion of the expandable element, in use, is greater than that of the carrier rod.

REFERENCES:
patent: 5024422 (1991-06-01), Fishler et al.
patent: 5303905 (1994-04-01), Pohl et al.
patent: 5681497 (1997-10-01), Labod
patent: 6026997 (2000-02-01), Kremer et al.
patent: 6464116 (2002-10-01), Hanse
Patent Abstracts of Japan, vol. 006, No. 033 (M-114), Feb. 27, 1982 & JP 56 148452 A (Nippon Kokan KK <NKK>), Nov. 17, 1981 (abstract).

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