Induced nuclear reactions: processes – systems – and elements – Seal arrangements
Patent
1985-10-10
1987-11-17
Kyle, Deborah L.
Induced nuclear reactions: processes, systems, and elements
Seal arrangements
376264, 138 89, 220323, G21C 1306
Patent
active
047073233
ABSTRACT:
A closure for an inclined duct having an open upper end and defining downwardly extending passageway. The closure includes a cap for sealing engagement with the open upper end of the duct. Associated with the cap are an array of vertically aligned plug members, each of which has a cross-sectional area substantially conforming to the cross-sectional area of the passageway at least adjacent the upper end of the passageway. The plug members are interconnected in a manner to provide for free movement only in the plane in which the duct is inclined. The uppermost plug member is attached to the cap means and the cap means is in turn connected to a hoist means which is located directly over the open end of the duct.
REFERENCES:
patent: 3672403 (1972-06-01), Wilson
patent: 3698592 (1972-10-01), Nelson
patent: 4425944 (1984-01-01), Heuckelbach et al.
patent: 4470946 (1984-09-01), Vassalotti et al.
patent: 4519519 (1985-05-01), Meuschke et al.
DeLarvin Clark E.
Field Harry B.
Hamann H. Fredrick
Klein Richard L.
Kyle Deborah L.
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