Overload limit clutch

Claim 1

IN AN OVERLOAD PROTECTION DEVICE, A DRIVING SHAFT, A DRIVEN SHAFT ROTATABLY MOUNTED ON SAID DRIVING SHAFT IN COAXIAL RELATION THERETO FOR RECIPROCATION IN A DIRECTION PARALLEL TO ITS AXIS AND RELATIVE TO SAID DRIVING SHAFT, A RADIAL PLANE SURFACE FORMED ON SAID DRIVING SHAFT IN A PLANE PERPENDICULAR TO ITS AXIS, A RADIAL PLANE SURFACE FORMED ON SAID DRIVEN SHAFT IN A PLANE PERPENDICULAR TO ITS AXIS, SAID PLANE SURFACES BEING OPPOSED TO ONE ANOTHER, AND INDEPENDENTLY ROTATABLE BALL RACE MOUNTED BETWEEN SAID PLANE SURFACES AND INCLUDING A PAIR OF PARALLEL FACES LOCATED ADJACENT THE PLANE SURFACE OF SAID DRIVING SHAFT AND SAID DRIVEN SHAFT RESPECTIVELY, SAID BALL RACE INCLUDING A PLURALITY OF APERTURES CUT THERETHROUGH PARALLEL TO THE AXIS OF SAID SHAFT AND LOCATED ON TWO DIFFERENT RADII MEASURED FROM THIS AXIS, A BALL MOUNTED IN EACH OF SAID APERTURES, A PLURALITY OF SPHERICAL RECESSES CUT INTO SAID PLANE SURFACES CORRESPONDING IN NUMBER TO THE NUMBER OF BALLS AND LOCATED ON ONE PLANE SURFACE AT ONE OF SAID RADII AND LOCATED ON THE OTHER PLANE SURFACE AT THE REMAINING ONE OF SAID RADII, THE DEPTH OF SAID RECESSES BEING LESS THAN THE RADIUS OF THE BALLS AND THE THICKNESS OF SAID BALL RACE BETWEEN SAID FACES BEING EQUAL TO THE DIFFERENCE BETWEEN THE BALL DIAMETER AND THE DEPTH OF SAID RECESSES, AND MEANS OPERATIVELY CONNECTED BETWEEN SAID DRIVING SHAFT AND SAID DRIVEN SHAFT NORMALLY ADAPTED TO URGE SAID PLANE SURFACES TOWARD ONE ANOTHER.