Patent ID: RE41827

Claim:
An electromagnetic actuator comprising: a fixed core supported by a bottom wall of a housing made of magnetic material; a movable core arranged opposite to the fixed core via an air gap to drive a movable member; and a coil assembly comprising a bobbin supported by the housing to surround the fixed and movable cores, and a coil wound around the bobbin, wherein the movable member and the movable core are coupled by coupling means for adjusting the air gap between the fixed core and the movable core, wherein an adjustment operating hole through which the coupling means is adjusted is provided on the fixed core to be opened from outside the bottom wall of the housing, and wherein the coupling means comprises a connecting bolt integral with the movable member, and an adjustment nut mounted at a lower end portion of the connecting bolt for advancing and retreating movements relative to the connecting bolt through threaded engagement therebetween, wherein adjustment of a threaded position of the adjustment nut on the connecting bolt adjusts a position of the movable core relative to the fixed core.