Thermostatic torque responsive clutch

Claim 1

A CLUTCH ASSEMBLY FOR INTERMITTENLLY OPERATING A COOLING UNIT FOR AN INTERNAL-COMBUSTION ENGINE, COMPRISING A DRIVE SHAFT PROVIDED WITH MALE THREADS AND POWERED BY SAID ENGINE; A NUT ON SAID SHAFT LIMITEDLY ROTATABLE AND AXIALLY DISPLACEABLE WITH REFERENCE TO SAID SHAFT, SAID NUTHAVING FEMALE THREADS MATING WITH SAID MALE THREADS FOR AXIALLY DISPLACING SAID NUT FROM A NORMAL POSITION TOWARD AN OFF-NORMAL POSITION UPON RELATIVE ROTATION OF SAID NUT AND SAID SHAFT IN A PREDETERMINED DIRECTION; A ROTARY BODY CONCENTRIC WITH SAID SHAFT; FORCE-TRANSMITTING MEANS INCLUDING AN AXIALLY YEILDABLE RESILIENT LINKAGE CONNECTING SAID BODY WITH SAID NUT AT LEAST IN POSITONS OTHER THAN SAID NORMAL POSITION FOR JOINT ROTATION THEREWITH; A DRIVEN MEMBER COAXIAL WITH SAID SHAFT AND SAID BODY, SAID DRIVEN MEMBER BEING COUPLED WITH SAID COOLING UNIT, SAID DRIVEN MEMBER AND SAID BODY BEING PROVIDED WITH CONFRONTING ANNULAR CONTACT SURFACES SPACED FROM EACH OTHER IN SAID NORMAL POSITION OF SAID NUT AND BEARING UPON EACH OTHER WITH INCREASING PRESSURE UPON PROGRESSIVE DISPLACEMENT OF SAID NUT TOWARD SAID OFF-NORMAL POSITION FOR FRICTIONAL ENTRAINMENT OF SAID DRIVEN MEMBER WITH A TORQUE DEPENDING UPON THE AXIAL POSITION OF SAID NUT; AND CONTROL MEANS RESPONSIVE TO CHANGES OF AMBIENT TEMPERATURE IN THE VICINITY OF SAID ENGINE FOR EXTERING UPON SAID NUT AN AXIAL FORCE FOR SHIFTING SAID NUT INTO AND OUT OF SAID NORMAL POSITION WITH REFERENCE TO SAID SHAFT, SAID THREADS HAVING A PITCH ANGLE LARGE ENOUGH TO ENABLE RELATIVE AXIAL DISPLACEMENT OF SAID NUT AND SAID SHAFT BY SAID FORCE.