US 4,048,926 AGranted

Safe

AssigneeJohn D. Brush & Co., Inc.

InventorsJohn D. Brush, Jr., George M. Burgess

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Abstract

A safe has a self-sealing jamb where the door confronts and fits together with the box. This is done by forming the confronting surfaces in the jamb region of a resin material and making the jamb region non-linear in cross section and long enough in cross section so that after an outer portion of the resin material is burned off in a fire, a charred residue and a plasticized portion of the resin material remain in the jamb region to seal the door to the box around the jamb region for substantially preventing heat conduction or passage of hot gasses through the jamb region to the interior of the box. The safe can also be formed in a resin mold for the box and the door with the mold remaining in place when the safe is used. The mold is preferably filled with a non-flammable, thermal insulating material having a substantial volume of chemically bonded water and made thick enough to maintain the interior of the box below 180.degree. C for one hour in an ambient atmosphere of about 927.degree. C. The box then lacks any external metallic shell so that the molded insulating material is exposed directly to the ambient atmosphere after the exterior resin casing is burned off in a fire. This also improves the heat resistance of the safe.

Claims16

Dependent claims

A fire-resistant safe for protecting stored contents from ambient fire, said safe having a box and a door formed of a thermal insulating material and having a jamb region that is non-linear in cross section where a peripheral region of said door confronts and fits together with a region around an opening in said box, and said safe comprising:

a. the space between said insulating material of said box and said door in said jamb region being substantially filled with a resin material overlying said insulating material, said resin material being combustable at temperatures substantially less than the temperature of said ambient fire;
b. said resin material being substantially thermally non-conductive and arranged to provide means for substantially preventing conduction of heat from said ambient fire through said jamb region to the interior of said box;
c. said space between said insulating material of said box and said door in said jamb region being thin enough relative to the length of said non-linear cross section to provide means for protecting an inner portion of said resin material in said jamb region from combustion in said ambient fire;
and
d. said resin material providing means for substantially sealing said jamb region against passage of hot gases from said ambient fire into said interior of said box, said sealing resulting from a charred resin residue adjacent said unburned inner portion of said resin material after said ambient fire burns away an outer portion of said resin material.

2 more elements

Dependencies are inferred from the claim text.