Patent ID: 8149077

Claim:
An electromagnetic operating device for a switch comprising: a fixed yoke formed in such a way that E-shaped yokes formed by laminating E-shaped magnetic steel sheets are arranged opposite each other with their projecting sections of the E-shape facing each other; square yokes formed by laminating magnetic steel sheets and having a ring-shaped core section and a projecting magnetic pole section are disposed on both outer sides of the E-shaped yokes; wherein the square yokes and the E-shaped yokes are integrally laminated with the E-shaped yokes being sandwiched between the square yokes; permanent magnets; a moving member for linearly moving a predetermined distance inside the fixed yoke; a rod connected to the moving member and penetrating the fixed yoke to project outward from both sides thereof; and coils disposed in the fixed yoke, wherein the moving member is moved by magnetic flux generated by supplying a current to the coils so as to abut the inner periphery of the fixed yoke, and the movement position of the moving member being held by the magnets, and a plurality of first through-holes that penetrate the magnetic steel sheets in a laminating direction of the sheets is provided in the fixed yoke, and first pins, whose diameter is smaller than that of the plurality of first-through-holes, and have end portions that are threaded and between the end portions, a middle portion that is not threaded, are inserted into at least two of the plurality of first through-holes to penetrate therethrough, so that the laminated steel sheets of the fixed yoke are fastened using the threaded portions of the first pins and the middle portion of the first pins being recessed from an exterior surface of the magnetic steel sheets in the laminating direction.