Safes – bank protection – or a related device – Wall and panel structures – closures and closure adjuncts – Walls and panels
Patent
1973-11-26
1978-07-18
Taylor, Dennis L.
Safes, bank protection, or a related device
Wall and panel structures, closures and closure adjuncts
Walls and panels
109 495, 109 23R, 220444, E04B 202, B65D 2518
Patent
active
041008600
ABSTRACT:
A shipping container overpack for safe transportation of radioactive and other hazardous materials provides a leakproof receptacle for containing and protecting the material to be shipped against accidental release and dispersal into the surrounding environment. The receptacle is of conventional size and shape for shipping containers and has spaced inner and outer shells with a layer of foamed polyurethane occupying the space therebetween to provide sealing, insulation and reinforcement. The polyurethane foam is rigidly compressible and adheres to and reinforces the spaced inner and outer shells to provide a stress skin structure. Gusset plates are secured to the inner surface of the outer shell in covering relation to the corners and edges, defining a reinforcing framework of triangular cross-section tubular elements. Relatively rigid polyurethane foam is containd within the tubular elements to add further reinforcement and redundant sealing capacity.
Penetration is resisted by making the outer shell of relatively ductile metal adapted to deform and absorb energy rather than permit penetration. Deformable slip plates back up large flat areas of the outer shell, providing increased resistance to penetration. Orifices are provided in the outer shell so that the effects of excessive heat applied to the outer shell, as by a surrounding fire, are reduced by formation of a gas, caused by heat decomposition of the polyurethane foam, flowing in a layer just under the outer shell to provide insulation and carry off heat, with the expulsion of such gases through the orifices being of sufficient force to ensure that combustion of the expelled gases takes place a spaced distance from the outside shell.
A method of fabricating the receptacle is disclosed in which a liquid isocyanate is mixed with a liquid curing agent and a liquid blowing agent and poured into the space between the inner and outer shell. The reaction of the curing agent with the isocyanate generates heat sufficient to vaporize the blowing agent causing the foam to be formed and cured in place. The heat sink effect of the metal shells reduces the foaming action thereat so that the foam material is of higher average density adjacent to the shells than it is is remote from the shells.
The receptacle is formed in sections and is provided with a gasket for sealing the material to be shipped therewithin. In one form of the invention, the receptacle has the usual fittings and is of the size and shape of a conventional shipping container, of the type used for carrying cargo in seagoing vessels, and is formed with a box-like section and a lid section hinged thereon. In another form of the invention, the receptacle is cylindrical shaped to accommodate a conventional lead radiation shielding container, and is transected medially of its length to provide access.
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Gablin Kenneth A.
Hansen Larry J.
Nuclear Engineering Co., Inc.
Taylor Dennis L.
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