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Safes and similar security structures

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专利汇可以提供Safes and similar security structures专利检索，专利查询，专利分析的服务。并且A slab or panel for use in a safe or similar structure comprises a layer of material resistant to drilling and other forms of mechanical attack backed by a layer of material, preferably graphite, which melts and vaporizes but does not substantially react exothermically with oxygen at the temperatures generated by a thermic lance, i.e., of the order of 3,000* C. The melting and vaporization involves the provision of such large amounts of latent heat thus taking several times as long to burn a hole through the slab. The material for resisting mechanical attack preferably comprises nuggets of heard material in a ductile metal matrix and a convenient form of construction there is a single layer of this material and a single layer of the vaporizable material. The vaporizable material is preferably in the form of blocks of triangular section fitted into compartments defined by metallic spacing members supported between a pair of steel plates.，下面是Safes and similar security structures专利的具体信息内容。

权利要求

1. A safe having at least one wall including a slab comprising a continuous face layer, said face layer being of drill-resisting material and comprising nuggets having at least the hardness of fused alumina embedded in a ductile metal matrix, a backing layer of material which melts and vaporizes but does not substantially react exothermically with oxygen at temperatures of the order of 3,000* C., and means additional to said face layer for supporting said backing layer behind said face layer.

2. A slab according to claim 1, comprising a single layer of drill-resisting material and a single layer of vaporizable material.

3. A slab according to claim 1 in which said vaporizable material is graphite.

4. A slab according to claim 1 in which said face layer comprises a ductile metal matrix and nuggets of hard material in said metal matrix.

5. A safe having at least one wall including a slab comprising a continuous face layer, said face layer being of drill-resisting material, and a backing layer, said backing layer including metallic spacing members defining at least in part a plurality of compartments of regular cross section, and a plurality of bars of a material which melts and vaporizes but does not substantially react exothermically with oxygen at temperatures of the order of 3,000* C., said bars being of corresponding cross section to said compartments and being located in said compartments.

6. A slab according to claim 5, in which said blocks are of triangular cross section and said spacing members are inclined to a plane perpendicular to the surface of said backing layer.

7. A slab according to claim 6, including a pair of steel plates forming the outer sides of said compartments, said spacing members being supported by said plates.

8. A slab according to claim 7 in which said spacing members are securEd to said steel plates at a spacing of approximately eight inches.

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