Viscous fluid coupling drive

Claim 1

A CONTROL FOR VISCOUS FLUID COUPLING OF THE TYPE HAVING A CLOSED CONTAINER HAVING VISCOUS WORKING FLUID THEREIN AND A SEPARATOR DIVIDING SAID CONTAINER INTO A WORKING CHAMBER AND A FLUID RESERVOIR, SAID WORKING CHAMBER HAVING COOPERATING DRIVE AND DRIVEN MEMBERS THEREIN FOR DRIVING SAID CONTAINER, AN OPENING THROUGH SAID SEPARATOR FOR PERMITTING CONTINUOUS FLUID FLOW FROM SAID WORKING CHAMBER TO SAID RESERVOIR, A SECOND OPENING THROUGH SAID SEPARATOR FOR PERMITTING FLUID FLOW FROM SAID RESERVOIR TO SAID WORKING CHAMBER, SAID CONTROL INCLUDING A TEMPERATURE RESPONSIVE POWER ELEMENT SUPPORTED UPON SAID CONTAINER HAVING A HEAD PORTION EXTERIOR OF SAID RESERVOIR AND A BODY PORTION EXTENDING INTO SAID RESERVOIR, SAID POWER ELEMENT HAVING A PLUNGER DISPOSED FOR RECIPROCATORY MOTION WITH RESPECT TO SAID BODY PORTION IN RESPONSE TO VARIATION OF TEMPERATURE OF SAID HEAD PORTION, A VALVE NORMALLY EFFECTIVE TO BLOCK OFF SAID SECOND OPENING WHEN SAID POWER ELEMENT IS COLD, SAID VALVE HAVING A PLATE PORTION OVERLYING SAID SECOND OPENING AND A FOOT PORTION SEATED ON SAID SEPARATOR, SAID VALVE HAVING AN UPSTANDING ARM FORMED INTEGRALLY WITH SAID PLATE PORTION AND SAID FOOT PORTION, AND MEANS CONNECTING SAID PLUNGER TO SAID ARM FOR CAUSING PIVOTAL MOTION OF SAID VALVE ABOUT SAID FOOT PORTION IN RESPONSE TO RECIPROCATORY MOTION OF SAID PLUNGER.