Preloaded pivot joint

Claim 1

A JOINT ADAPTED TO TRANSMIT ENDWISE MOVEMENT IN A LINKAGE WHILE ACCOMMODATING MISALIGNMENT OF THE LINK PARTS UNDER HEAVY LOAD WHICH COMPRISES A PIN HAVING AN ENLARGED HEAD ON THE END THEREOF PROVIDING A BEARING SURFACE ACCOMODATING ROTATION OF THE PIN ABOUT ITS OWN AXIS AND AN AXIAL RECESS IN THE END OF THE HEAD SURROUNDED BY A RIM, A SOCKET HAVING AN APERTURE RECEIVING THE PIN FREELY THERETHROUGH AND A CHAMBER RECEIVING THE HEAD OF THE PIN, A HIGH DENSITY LINEAR ETHYLENE COPOLYMER BEARING BLOCK IN THE SOCKET ENVELOPING SAID HEAD, A HIGH DENSITY LINER ETHYLENE COPOLYMER PLUG IN SAID AXIAL RECESS OF THE HEAD AND PROJECTING THEREFROM, A CLOSURE PLATE FOR THE SOCKET DEFORMING SAID BEARING BLOCK AND PLUG AND FLOWING THE MATERIAL THEREOF OVER THE RIM OF THE HEAD AND INTO CONFORMITY WITH SAID PLATE, AND GREASE TRAPPED BETWEEN THE HEAD AND BEARING BLOCK AND BETWEEN THE HEAD AND PLUG BY THE DEFORMED PORTION THEREOF FOR FACILITATING ROTATION OF THE PIN IN THE BEARING BLOCK TO MAINTAIN A CONSTANT TURNING TORQUE FOR THE JOINT.