Electromagnetic switching relay

摘要

An electromagnetic relay having a switching sensitivity alterable under the influence of an external magnetic field. The relay comprises a coil form made from an insulating material. A plurality of pole-shoes, also acting as relay contacts, are mounted in the coil form. A plurality of ferromagnetic inlays which exhibit magnetic lines of force are mounted in the coil form so that each one of the inlays is associated with a corresponding one of the pole-shoes. When the inlays are mounted, the magnetic lines of force exhibited by these inlays are not perpendicular to the corresponding pole-shoes. A magnetic insulating region is formed by the coil form for partially insulating the pole-shoes from the lines of magnetic force exhibited by the corresponding inlay. The relay contains a substantially flat ferromagnetic armature which is switched into one of two positions in response to an excitation coil which is sensitive to an electrical current. When the relay is rotated relative to an external magnetic field, the components of the magnetic lines of force exhibited by the inlays vary, resulting in a corresponding variation in the switching sensitivity of the armature. A bearing assembly containing recesses in the form of a biconcave lens are also provided for mounting the armature.