Patent ID: 7948338

Claim:
An electromagnetic switch comprising: a hollow cylindrical switch case with a bottom and an open end; an exciting coil disposed within said switch case and working as an electromagnet when being energized; a stationary core disposed inside said exciting coil in abutment with the bottom of said switch case; an annular magnetic plate with a circular center hole, said magnetic plate being disposed within said switch case closer to the open end of said switch case than said exciting coil and working as a portion of a magnetic circuit; a movable core disposed in alignment with said stationary core to be moved by magnetic attraction, as produced by said exciting coil, through the center hole of said magnetic plate inside said exciting coil in an axial direction of said switch case; a resinous cover including a bottom portion and a hollow cylindrical portion, the hollow cylindrical portion having a first end continuing to the bottom portion of said resinous cover and a second end opposite the first end, said resinous cover being joined to said switch case with the first end being in abutment with an inner periphery of the open end of said switch case and the second end being in abutment with one of end surfaces of said magnetic plate which is away from said exciting coil to define a contact chamber between itself and said magnetic plate; a first terminal bolt retained in the bottom portion of said resinous cover, said first terminal bolt having a first fixed contact disposed within the contact chamber; a second terminal bolt retained in the bottom portion of said resinous cover, said first terminal bolt having a second fixed contact disposed within the contact chamber; a movable contact disposed within the contact chamber, said movable contact being to be moved by motion of said movable core to establish and block electrical connection between the first and second fixed contacts selectively; and an electronic control circuit working to control energization of said exciting coil, said electronic control circuit being disposed between said exciting coil and said magnetic plate.