초록 ▼

A safe having a wall comprising spaced steel plates, a sheathing layer between the plates consisting of hard non-metallic grains of e.g., boron carbide, silicon carbide, boron nitride, diamonds, ceramic oxides and hard metallic grains of e.g., cast iron, metal carbides, nitrides, borides, and silici

A safe having a wall comprising spaced steel plates, a sheathing layer between the plates consisting of hard non-metallic grains of e.g., boron carbide, silicon carbide, boron nitride, diamonds, ceramic oxides and hard metallic grains of e.g., cast iron, metal carbides, nitrides, borides, and silicides, said grains being bound together and to said plates by a hard solder mass having a copper or nickel base. The sheathing layer contains 30-70% by volume of said non-metallic grains (having a grain size of 5 to 20 mm) and metallic grains (having a grain size of 1 to 6 mm) and from 70% to 30% of said hard solder. The ratio of said non-metallic to said metallic grains is 2-4 parts to 1 part by volume. A method for making the sheathing layer is also disclosed.

대표청구항 ▼

A wall element for safety structure such as safes comprsing two parallel spaced steel plates; a sheathing layer of hard granular material disposed between the plates; a hard solder mass between the grains of granular material binding them together and to the inner surfaces of said steel plates; char

A wall element for safety structure such as safes comprsing two parallel spaced steel plates; a sheathing layer of hard granular material disposed between the plates; a hard solder mass between the grains of granular material binding them together and to the inner surfaces of said steel plates; characterized in that the sheathing layer is formed from 30-70% by volume of said hard granular material present in the amount of two to four parts by volume of a non-metallic substance taken from the group consisting of diamonds, boron carbide, silicon carbide, boron nitride, and ceramic oxides to one part of a hard metallic substance taken from the group consisting of cast iron, metallic carbides, nitrides, borides and silicides, the remainder being said hard solder mass.