Hollow housing case for sheathing and electromagnetically shielding electrical apparatus

Claim 1

A hollow case for sheathing and electromagnetically shielding electric apparatus, comprising a sheet of electrically conducting plate which has one insulating surface outside and an opposite non-insulating surface inside, wherein said conducting plate is deformed into a hollow form; said case including a connecting part which enables said non-insulating surfaces at both ends of said conducting plate to face and contact with each other, so that said non-insulating surfaces are in firm surface-to-surface contact; wherein said connecting part is a bent portion which is formed at one end of said conducting plate and which has an innermost section and an outermost section, said one end being bent back outwardly such that said insulating surface is arranged inside said bent portion; and wherein the other end of said conducting plate is set on said bent portion such that it overlaps said outermost section and such that the non-insulating surfaces at both ends face and contact each other; concentrically arranged holes formed in said bent portion and said other end where said non-insulating surfaces face and contact each other, said holes comprising an inserting hole formed in said other end, a guide hole formed in the outermost section of said bent portion, and a staking hole formed in the innermost section of said bent portion; and at least one fastening member contained within said holes and fastening said facing non-insulating surfaces together, one end of the fastening member having a portion bearing against the insulating surface of said other end of said conducting plate and the other end of the fastening member being contained in the staking hole without protrusion into said hollow form, and wherein the diameter of the inserting hole is not smaller than the diameter of the guide hole; the diameter of the guide hole is approximately the same as the diameter of the fastening member; and the diameter of the staking hole is larger than the end of the fastening member which is contained therein.