Electromagnetic switching relay

An electromagnetic relay having a switching sensitivity alterable under the influence of an external magnetic field, said relay comprising:

• a coil form made from an insulating material;
• a plurality of pole-shoes mounted in said coil form, said pole-shoes, also, acting as relay contacts;
• a plurality of ferromagnetic inlays which exhibit magnetic lines of force, each one of said inlays being associated with a corresponding one of said pole-shoes, said inlays being mounted in said coil form so that the lines of force are not perpendicular to the corresponding pole-shoe;
• a magnetic insulating means formed by said coil form for partially insulating said pole-shoes from the lines of force exhibited by said corresponding inlay;
• a substantially flat ferromagnetic armature mounted for transverse rotation within said coil form, said armature operable in a first position for providing a conductive path between a number of pole-shoes and in a second position for providing a conductive path between a different number of pole-shoes;
• and
• excitation coil means, surrounding a portion of said coil form and said armature, said coil means being sensitive to an electrical current for switching said armature to at least one of said two positions, wherein, upon rotation of said relay relative to said external magnetic field, the components of the lines of force exhibited by said inlays vary, resulting in a corresponding variation in the switching sensitivity of said armature, wherein said plurality of pole-shoes is four pole-shoes arranged in pairs, and said plurality of inlays is two inlays which are permanent magnets both polarized in the same direction each one of said two inlays being associated with a corresponding pole-shoe in one of said pole-shoe pairs, and further comprising a third permanent magnet positioned between the pole shoes of said other pole-shoe pair, said third permanent magnet being polarized in a direction opposite to the direction of said permanent magnets.

An electromagnetic switching relay having a switching sensitivity alterable under the influence of an external magnetic field, said relay comprising:

• a coil form made from an insulating material;
• a plurality of pole-shoes mounted in said coil form, said pole-shoes, also, acting as relay contacts;
• a plurality of ferromagnetic inlays which exhibit magnetic lines of force, each one of said inlays being associated with a corresponding one of said pole-shoes, said inlays being mounted in said coil form so that the lines of force are not perpendicular to the corresponding pole shoe;
• a magnetic insulating means formed by said coil form for partially insulating said pole-shoes from the lines of force exhibited by said corresponding inlay;
• a substantially flat ferromagnetic armature mounted for transverse rotation within said coil form, said armature operable in a first position for providing a conductive path between a number of pole-shoes and in a second position for providing a conductive path between a different number of pole-shoes;
• and
• excitation coil means, surrounding a portion of said coil form and said armature, said coil means being sensitive to an electrical current for switching said armature to at least one of said two positions, wherein, upon rotation of said relay relative to said external magnetic field, the components of the lines of force exhibited by said inlays vary, resulting in a corresponding variation in the switching sensitivity of said armature, further comprising a square-shaped extension projecting laterally from each side of said armature within a plane defined by the flat portion of said armature, and a pair of bearings formed in said coil form, each having a recess in the form of a profile of a biconcave lens for rotatably mounting one of said extensions.