FIRE RESISTANT SAFE

• US 3,559,594 A
• Filed: 07/14/1969
• Issued: 02/02/1971
• Est. Priority Date: 07/14/1969
• Status: Expired due to Term

• Current Assignee: Walter N. Miller
• Original Assignee: Walter N. Miller
• Inventors: Miller, Walter N.
• Application Number:
  US04/841,284
• Time in Patent Office: 568 Days
• US Class Current: 109/84
• CPC Class Codes: E05G 1/024 Wall or panel structure

Abstract

A fire resistant safe, particularly for the storage of EDP records such as magnetic tapes, discs, microfilm and the like, wherein an inner storage area or repository is surrounded by at least three layers of heat resistant material, an outer layer of concrete, a middle layer of insulation such as urethane foam separated from the concrete by a polyethylene moisture shield and an inner layer comprised, at least in part, of Sodium Acetate Trihydrate which is a material with a heat fusion of 100 Btu per lb., a melting point in the range of 136-144* F. and a density of approximately 90 lbs. per cubic foot. Such a safe has been shown to maintain the temperature of its inner repository below 150* F. and the relative humidity of the repository below 85 percent for 4 hours when subjected to an external temperature of 2000* F.

Claims

2. A safe as in claim 1 wherein said insulation is urethane foam and said outer layer is concrete, and further including a moisture shield comprised of polyethylene disposed between said concrete and said urethane foam.

3. A safe as in claim 2 wherein said concrete has a thickness of approximately 4- 3/4 inches, said foam has a thickness of approximately 1- 1/2 inches and said inner layer has a thickness of approximately seven-eighths inch.

4. A safe as in claim 1 wherein said safe has a first set of outer doors and a second set of inner doors for access to said repository and wherein said outer doors are filled with concrete and said inner doors are filled with urethane foam.

5. A safe as in claim 1 wherein said safe is for storing EDP records and including means to store said EDP records.

6. A safe as in claim 1 wherein said inner layer is comprised solely of Sodium Acetate Trihydrate and including a container for holding said Sodium Acetate Trihydrate.

7. A safe as in claim 1 wherein said outer, middle, and inner layers surround said safe on the top, bottom and three sides.

8. A safe as in claim 1 wherein said outer layer is comprised of concrete.