Patent ID: 8138872

Claim:
A contact device comprising: a first yoke having a substantially U-shape; a second yoke bridged over both ends of the first yoke; a spool wound with a coil disposed between the first yoke and the second yoke; a movable iron core is inserted into a center hole of the spool in a reciprocating manner; and a contact mechanism unit formed above the second yoke driven with a drive shaft having a lower end fixed to the movable iron core, which reciprocates based on excitation and demagnetization of the coil, and an upper end projecting out from an upper surface of the second yoke; wherein an insertion hole communicating to the center hole of the spool and through which the movable iron core reciprocates is formed in the first yoke, and an entirety of an annular auxiliary yoke including an insertion hole communicating to the insertion hole of the first yoke and through which the movable iron core reciprocates is provided at a lower surface of a base of the first yoke.