Patent ID: 7307506

Claim:
A switch, comprising a body with a top opening and a switch member pivotably engaged with the top opening of the body, an extension extending from a first end of an underside of the switch member and a push rod extending from a second end of the underside of the switch member, a protrusion extending axially from a distal end of the push rod, a first terminal and a second terminal extending through a bottom of the body; and a contact plate being a curved flexible metal plate and having a first end fixed to the first terminal and a second end of the contact plate being a free end, a contact portion splitting from the contact plate and a first contact point connected to an underside of the contact portion, a free end of the contact portion located above a top surface of the contact plate and connected with a free first end of a spring member, a second end of the spring member connected to the contact plate, a through hole defined through the spring member, a second contact point connected to the second terminal and located beneath the first contact point on the contact portion, the second end of the contact plate and the free end of the contact portion being deformed in opposite directions when being heated, the extension of the switch member located above the second end of the contact plate and pressing the second end of the contact plate downward when the switch member is at “OFF” position, when the second end of the switch member is pushed downward to “ON” position, the spring member being pushed by the push rod to lower the first contact point to be in contact with the second contact point and the protrusion slipping into the through hole, a space defined between the push rod and an inner periphery of the through hole, when overloaded, the contact portion being deformed upward to move the spring member upward and the push rod extending through the through hole to allow the upward movement of the spring member to be completed.