Patent ID: 7005597

Claim:
A switch device comprising: a case having a receiving part, at least a pair of contact plates arranged in the receiving part, a first rotor plate rotatably arranged and having a contact driving part for pressing at least one of the contact plates, a second rotor plate operatively coupled with the first rotor plate, a rotating shaft that journals the first and second rotor plates, a bimetal piece engaged with the second rotor plate for rotating the second rotor plate with the rotation of the rotating shaft, a heater for heating the bimetal piece, and an actuating shaft for rotating the rotating shaft, wherein, when the actuating shaft is actuated, the bimetal piece causes the first rotor plate to rotate through the second rotor plate with the rotation of the rotating shaft, to turn on the pair of contact plates, wherein, when the heater is heated to a predetermined temperature, the bimetal piece is displaced to cause the first rotor plate to rotate through the second rotor plate to turn off the pair of turned-on contact plates, and wherein, the first rotor plate and the second rotor plate are operatively coupled with each other with a torsion coil spring and when the first rotor plate is rotated, a reversing force from the torsion coil spring causes the contact driving part to engage with or disengage from the contact plates.