Torque limiting device

Claim 1

A TORQUE LIMITING MECHANISM FOR USE IN COMBINATION WITH SPROCKETS, SHEAVES, PULLEYS, GEARS AND THE LIKE, COMPRISING A CYLINDRICALLY-SHAPED HUB HAVING A LONGITUDINAL BORE THERETHROUGH AND A PLURALITY OF LONGITUDINAL GROOVES ON THE EXTERNAL SURFACE AND ANNULAR ABUTMENT MEANS ON THE EXTERNAL SURFACE OF SAID HUB, A THREADED PORTION ON THE EXTERNAL SURFACE OF SAID HUB SPACED FROM SAID MEANS, A PAIR OF ANNULAR PRESSURE PLATES WITH A CENTER OPENING ON SAID HUB DISPOSED BETWEEN SAID MEANS AND SAID THREADED PORTION AND HAVING FRICTION MATERIAL ON THEIR INNER SIDE SURFACES AND LUG MEANS EXTENDING INTO SAID LONGITUDINAL GROOVES, A DISC-SHAPED DRIVE PLATE ROTATABLY MOUNTED ON SAID HUB BETWEEN SAID PRESSURE PLATES, A RING MEMBER THREADEDLY RECEIVED IN PREDETERMINED POSITION ON SAID THREADED PORTION AND HAVING THREE THREADED HOLES THERETHROUGH WITH ENLARGED OUTER END PORTIONS, AN ANNULAR RESILIENT MEANS INTERDISPOSED BETWEEN SAID ABUTMENT MEANS AND THE ADJACENT PRESSURE PLATE, AND ADJUSTMENT SCREWS IN THE HOLES OF SAID RING MEMBER FOR ENGAGING THE ADJACENT PRESSURE PLATE, EACH OF SAID SCREWS HAVING A HEAD SEATING AGAINST SAID RING IN THE OUTER PORTION OF THE RESPECTIVE HOLE IN SAID RING FOR DETERMINING THE TORQUE REQUIRED TO CAUSE RELATIVE ROTATION BETWEEN SAID PAIR OF PRESSURE PLATES AND SAID DRIVE PLATE.