Patent ID: 8242866

Claim:
A sealed cased magnetic switch, which includes a sealed container with one side opened, a fixed electrode air-tightly attached to the side opposite to the opened side of the sealed container, a movable contactor movable to a position at which it is brought into contact with the fixed electrode and to a position at which it is separated from the fixed electrode, a driving shaft supporting the movable contactor and being movable along with the movable contactor, a movable core coupled with the driving shaft so as to be movable together, a fixed core installed to face the movable core, a bobbin accommodating the fixed core and the movable core in the interior of a hollow thereof, a coil wound around the bobbin, a yoke installed near the coil to form a magnetic path, and an iron plate forming the magnetic path along with the yoke and installed at an upper portion of the bobbin, the sealed cased magnetic switch comprising: a first contact pressure spring having one end supported by the movable contactor and applying an elastic force to the movable contactor to provide a contact pressure in a direction in which the movable contactor is brought into contact with the fixed electrode; a spring seat member supporting the other end of the first contact pressure spring and fixedly installed on the driving shaft; and a second contact pressure spring having a diameter larger than that of the first contact pressure spring and applying an elastic force at an outer position in a radial direction compared with the first contact pressure spring to the movable contactor in a direction in which the movable contactor is brought into contact with the fixed electrode, wherein one end of the second contact pressure spring is supported by the movable contactor and the other end of the second contact pressure spring is supported by the iron plate.