Concrete security structures and method for making same
AssigneeThe Mosler Safe Company
InventorHarry J. Wurster
Life of this patent
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Abstract
A concrete security structure such as a money safe, vault, or the like, is provided with unique burglar-proof qualities. The security structure includes a hardened concrete composition which possesses torch or high temperature resistance without flaking, spalling or exploding, and superior resistance to attack by means of burglary tools such as hammers, chisels, drills, cutting implements or the like. The security concrete is derived from a moldable uniform mixture which comprises granular temperature resistant aggregates, reinforcing filaments, an expansive cement and water. A method for making safes or vaults is provided by supplying a castable aqueous mixture of ingredients into a metallic shell, casing or mold and permitting the mixture to cure.
Claims11
A safe or vault structure including a self-stressed cured concrete having enhanced resistance to attack by burglar means including torch resistance without flaking, spalling or exploding and resistance to attack by hammers, chisels, drills and cutting implements, derived from a moldable uniform mixture comprising
- about 120 to about 190 parts silica sand aggregates,
- about 40 to about 65 parts metal fibers for torch-tip destruction and reinforcement of said cured concrete,
- about 80 to about 175 parts expansive cement containing a portland cement and an expansive component in an amount at least sufficient to compensate for the shrinkage of said portland cement and to impart expansive and self-stressed properties to the portland cement when said component is hydrated upon curing, and
- about 30 to about 75 parts water to provide a workable moldable mixture, said mixture of ingredients having a slump of about 5.5 to about 6.5 inches and wherein said cured concrete provides said enhanced resistance to attack by said burglar means.
A method of making a safe or vault concrete structure having enhanced resistance to attack by burglar means including torch resistance without flaking, spalling or exploding and resistance to attack by hammers, chisels, drills and cutting implements, which comprises
- mixing about 120 to about 190 parts silica sand aggregates, about 40 to about 65 parts reinforcing metal filaments for torch-tip destruction and reinforcement of said concrete structure, about 80 to about 175 parts expansive cement and about 30 to about 75 parts water to provide a workable moldable mixture, said mixture of ingredients having a slump of about 5.5 to about 6.5 inches,
- casting said mixture into a container, and
- curing said mixture in said container to form said concrete structure having said enhanced resistance to attack by said burglar means.
A vault or safe door comprising a metal casing and a liner for said casing comprising a cured concrete resistant to attack by heat and implements including torch resistance without flaking, spalling or exploding and resistance to attack by hammers, chisels, drills and cutting implements derived from a moldable aqueous composition containing
- about 120 to about 190 parts silica sand aggregates,
- about 40 to about 65 parts metal fibers for torch-tip destruction and reinforcement of said cured concrete,
- about 80 to about 175 parts expansive cement containing a portland cement and an expansive component in an amount at least sufficient to compensate for the shrinkage of said portland cement and to impart expansive and self-stressed properties to the portland cement when said component is hydrated upon curing, and
- about 30 to about 75 parts water to provide a workable moldable mixture, said mixture of ingredients having a slump of about 5.5 to about 6.5 inches and wherein said cured concrete provides said enhanced resistance to attack by said burglar means.
A door or wall for a vault or safe comprising a body of cured concrete resistant to attack by heat and implements including torch resistance without flaking, spalling or exploding and resistance to attack by hammers, chisels, drills and cutting implements, derived from a moldable aqueous composition containing silica sand aggregates having a sieve analysis of no more than about 15% remaining on a 20 mesh screen and no more than 5% passing a 30 mesh screen, steel fibers for torch-tip destruction and reinforcement of said cured concrete on the order of about 1/2 to about 11/2 inches in length and having a diameter at the most about 0.3 inch and a Type K expansive cement component, said ingredients proportioned in amounts on the order of about 120 to 190 parts sand, about 40 to about 65 parts metal fibers, about 80 to about 175 parts Type K expansive cement and about 30 to about 75 parts water, said mixture of ingredients having a slump of about 5.5 to about 6.5 inches and wherein said cured concrete provides said enhanced resistance to attack by said burglar means.
Dependencies are inferred from the claim text.