Overload protection device of a press type switch

An overload protection device of a press type switch comprising:

• a main body formed as a hollow rectangular case, a press button being installed at the top thereof, at least one resilient element being disposed beneath said press button;
• at least two conductive plates composed of a first and a second conductive plate, said first conductive plate having a conductive boss while said second conductive plate is connected to a conductive strip to whose bottom a conductive nodule opposite to said conductive boss of said first conductive plate is fitted;
• a push-pull element being pivotably connected to said press button while the bottom end thereof is able to push and pull the free end of said conductive strip, thereby forming a press type switch;
• wherein a slide groove consisting of a plurality of curved crossed slide rails is arranged on the inner wall of the rear side of said main body within the bouncing range of the free end of said conductive strip, and said slide groove is directed from the highest first locating position (A) downwards in a curved way to the lowest first turning position (A′), and then directed upwards in a curved way to a second locating position (B), and said second locating position (B) is situated lower than the first locating position (A), and then slide groove is directed upwards in a curved way to a second turning position (B′) after intersecting said second slide rail, and then returns from the second turning position (B′) upwards to the first locating position (A) so that said slide groove in 8-shape is formed, and a stepped drop side is respectively formed at the connection and the cross positions between every two slide rails;
• and
• wherein said push-pull element has a cross bar beneath, and the end thereof is disposed in said slide groove, and a resilient piece exerts a resilient force on said slide groove at rear side of said main body.