Patent ID: 6335113
Filing Date: 2002-01-01
Classification: H01H

Abstract:
A thermostat causing a movable contact to come in contact with a fixed contact to become in the on state and separating the movable contact from the fixed contact to become in the off state comprising:(a) a first laminated metal plate in which a plurality of metal layers having different rates of expansion are laminated, which separates the movable contact from the fixed contact and becomes in the off state when the ambient temperature exceeds the first off temperature, and which a thermal deformation force acts on in the direction which the movable contact comes in contact with the fixed contact when the temperature falls below the first return temperature; and (b) a second laminated metal plate in which a plurality of metal layers having different rates of expansion are laminated, which is disposed in such a position as to put the first laminated metal plate in the off and on positions, which thermally deforms in such a shape as to maintain the first laminated metal plate in the off position when the ambient temperature exceeds the second off temperature that is higher than the first off temperature, and which thermally deforms in such a shape as to return the first laminated metal plate to the on position when the temperature falls below the second return temperature that is lower than the first return temperature.