Double safety thermostat having movable contacts disposed in both ends of a resilient plate

A double safety thermostat comprising a first stationary plate having a first terminal disposed in one end and connected to an external circuit and a first stationary contact disposed in the other end, a second stationary plate having a second terminal disposed in one end and connected to the external circuit and a second stationary contact disposed in the other end, a resilient plate having a first movable contact disposed in one end and a second movable contact disposed in the other end, a center support member for supporting said resilient plate at the center portion of said resilient plate, a thermally responsive member having a curvature of a shape thereof varying when a first predetermined set temperature is exceeded, and a plurality of clraws for engaging said thermally responsive member with said resilient plate, said first stationary plate, and resilient plate and said second stationary plate being electrically disposed in series to one another, the strength of a spring on the side of said first movable contact of said resilient plate being weaker than the strength of a spring on the side of said second movable contact, said first stationary and movable contacts and said second stationary and movable contacts being in contact with each other, respectively, in a lower temperature than said first set temperature, said first movable contact being separated from said first stationary contact when said first set temperature is exceeded, said movable contact being separated from said second stationary contact when said first movable contact is welded to said first stationary contact and said first set temperature is exceeded, wherein the strength of the spring on the side of said first movable contact of said resilient plate is made weaker than the strength of the spring on the side of said second movable contact by substantially narrowing a width of said resilient member on the side of said first movable contact, and by providing ribs or rims in said resilient plate.