Patent ID: 8446239

Claim:
An electromagnetic switch comprising: a coil that generates an electromagnetic force when energized: a movable iron core that is movable in an axial direction of the coil; an electrical contact arrangement including a pair of fixed contacts electrically connected to an electrical circuit, and a movable contact adapted to electrically connect and disconnect the pair of fixed contacts in response to a movement of the movable iron core; and a resin shaft that transfers the movement of the movable iron core to the movable contact when the electrical contact arrangement is switched from a closed state to an open state, wherein the movable iron core includes a shaft insertion hole of a predetermined depth that extends in an axial direction of the movable iron core and has an opening in an end face of the movable iron core axially opposing the movable contact, the shaft insertion hole includes a step disposed at a specific position along the depth and extending in a circumferential direction of the hole, the shaft insertion hole further includes a shaft fixture section on a bottom side of the step and a shaft guide section on an opening side of the step such that an inside diameter of the shaft fixture section is smaller than an inside diameter of the shaft guide section, one axial end side portion of the shaft is press fit in the shaft fixture section so that an outer periphery of the shaft is engaged with an inner periphery of the shaft fixture section, the movable iron core includes a crimping portion projecting inwardly in an inside diameter direction of the shaft insertion hole from the whole periphery of the opening of the hole, and an outer periphery of the shaft is pressed against the crimping portion.