Snap action thermostatic control

Claim 1

A THERMOSTAT FOR CONTROLLING THE HEATING ELEMENT OF AN ELECTRIC HEATING INSTALLATION COMPRISING A BASE HAVING AN UPPER SURFACE AND A LOWER SURFACE, SWITCH MEANS INCLUDING SEPARABLE CONTACTS MOUNTED ON SAID LOWER SURFACE OF THE BASE FOR CONTROLLING THE HEATING ELEMENT, A TEMPERATURERESPONSIVE MEANS MOUNTED ON THE SAID UPPER SURFACE OF THE BASE, SAID TEMPERATURE-RESPONSIVE MEANS HAVING A BIMETALLIC ELEMENT AND A SNAP MEMBER, SAID BIMETALLIC ELEMENT ACTUATING SAID SNAP MEMBER INTO A FIRST OR A SECOND SNAPPED POSITION IN ACCORDANCE WITH TEMPERATURE CHANGES ABOUT THE BIMETALLIC ELEMENT, MEANS EXTENDING THROUGH THE BASE CONNECTING SAID SNAP MEMBER TO ONE OF SAID CONTRACTS TO OPEN THE CONTACTS AS THE TEMPERATURE ABOUT THE BIMETALLIC ELEMENT INCREASES TO MOVE SAID SNAP MEMBER INTO ITS FIRST POSITION AND TO CLOSE THE CONTACTS WHEN THE TEMPERATURE ABOUT THE BIMETALLIC ELEMENT DECREASES TO MOVE SAID MEMBER INTO ITS SECOND POSITION, MANUALLY OPERABLE MEANS SUPPORTED ON THE UPPER SURFACE OF THE BASE ENGAGEABLE WITH SAID BI-METALLIC MEMBER AND EFFECTIVE TO VARY THE OPERATION CONDITION OF SAID BI-METALLIC ELEMENT AND SNAP MEM-