US4048926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safe
Assignee: John D Brush and Co Inc
•
Filing: 1976-01-12
•
Granted: 1977-09-20
•
Expires: 1996-01-12
Abstract
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° C for one hour in an ambient atmosphere of about 927° 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.
Inventors
- 👤 John D. Brush, Jr.
- 👤 George M. Burgess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:52
CPC Classifications
E; E05; E05G; E05G1/00; E05G1/02; E05G1/024; E05Y; E05Y2600/00; E05Y2600/50; E05Y2600/54
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
245 words
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.
Claim 2
Dependent Claim
245 words
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.
Claim 3
Dependent Claim
25 words
The safe of claim 1 wherein said resin material is formed in two layers respectively overlying said insulation material of said box and said door.
Claim 4
Dependent Claim
11 words
The safe of claim 1 wherein said resin material is thermoplastic.
Claim 5
Dependent Claim
31 words
The safe of claim 1 wherein said resin material overlies the exterior surfaces of said box where said resin is burnable at temperatures less than said temperature of said ambient fire.
Claim 6
Dependent Claim
18 words
The safe of claim 1 wherein said resin material forms a liner for said interior of said box.
Claim 7
Dependent Claim
31 words
The safe of claim 5 wherein said resin material overlies the exterior surfaces of said box where said resin is burnable at temperatures less than said temperature of said ambient fire.
Claim 8
Dependent Claim
20 words
The safe of claim 1 wherein said resin material overlies inner and outer surfaces of said box and said door.
Claim 9
Dependent Claim
62 words
The safe of claim 7 including a handle rotatable relative to said door, a tube extending through said door and rotatable with said handle, a lock bar mounted on said tube inside said door and rotatable with said tube, and recesses in the interior of said box for receiving the ends of said lock bar in a locked position of said door.
Claim 10
Dependent Claim
18 words
The safe of claim 8 including a bushing formed of said resin material to extend around said tube.
Claim 11
Dependent Claim
22 words
The safe of claim 8 wherein said door has an opening extending through said tube to vent the interior of said box.
Claim 12
Dependent Claim
61 words
The safe of claim 8 wherein said door has an arc-shaped recess, a lock pivots with said handle in said recess, said recess includes an enlargement area in the region of one end of said arc shape, and said lock has a bolt removably extendable into said enlargement area to hold said handle and said lock bar in said locked position.
Claim 13
Dependent Claim
19 words
The safe of claim 11 including a disk movable with said handle and said tube and overlying said recess.
Claim 14
Dependent Claim
62 words
The safe of claim 1 including a handle rotatable relative to said door, a tube extending through said door and rotatable with said handle, a lock bar mounted on said tube inside said door and rotatable with said tube, and recesses in the interior of said box for receiving the ends of said lock bar in a locked position of said door.
Claim 15
Dependent Claim
61 words
The safe of claim 13 wherein said door has an arc-shaped recess, a lock pivots with said handle in said recess, said recess includes an enlargement area in the region of one end of said arc shape, and said lock has a bolt removably extendable into said enlargement area to hold said handle and said lock bar in said locked position.
Claim 16
Dependent Claim
19 words
The safe of claim 14 including a disk movable with said handle and said tube and overlying said recess.
Claim 17
Dependent Claim
22 words
The safe of claim 15 wherein said door has an opening extending through said tube to vent the interior of said box.
References Cited (Backward Citations)
GB153998A
Cited
US1547721A
Cited
DE496511C
Cited
US1895594A
Cited
US2492422A
Cited
US2554399A
Cited
US3559594A
Cited
US3855741A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |