Self lubricating bearing

Claim 1

A SELF-LUBRICATING BEARING FOR ATTACHEMENT TO THE SAMSON POST OF A PUMPING JACK INCLUDING A WALKING BEAM COMPRISING: (A) A COLLAR ATTACHED TO SAID WALKING BEAM, (B) A BEARING SLEEVE EXTENDING THROUGH SAID COLLAR AND HAVING ENDS EXTENDING SUBSTANTIALLY EQUIDISTANT OUTWARDLY AND HAVING A PLUG ANCHORED AT SUBSTANTIALLY THE LONGITUDINAL CENTER THEREOF FORMING CYLINDERS ON EACH SIDE OF SAID PLUG, (C) MEANS ATTACHING SAID BEARING SLEEVE TO SAID COLLAR TO ROTATE THEREWITH, (D) PISTONS IN SAID CYLINDERS FORMING COMPARTMENTS FOR LUBRICANT IN SAID CYLINDERS OUTWARDLY OF SAID PISTONS, (E) HOUSING SECURED TO SAID SAMPSON POST HAVING CLOSED ENDS FOR THE ENDS OF SAID BEARING SLEEVE, THE OTHER ENDS OF SAID HOUSING ENGAGING AGAINST SAID COLLAR, THE INNER DIAMETER OF SAID HOUSINGS BEING GREATER THAN THE OUTER DIAMETER OF SAID BEARING SLEEVE AND HAVING A SPACE BETWEEN THE ENDS OF SAID BEARING SLEEVE AND THE ENDS OF SAID HOUSINGS, (F) BUSHINGS HAVING INNER AND OUTER SURFACES PRESSED INTO SAID HOUSING AND SURROUNDING SAID BEARING SLEEVE OUTWARDLY OF THE COLLAR, (G) MEANS URGING SAID PISTONS TOWARD THE CLOSED ENDS OF SAID HOUSINGS, AND (H) MEANS IN SAID BUSHINGS AND SAID HOUSINGS FOR PASSAGE OF LUBRICANT FROM SAID COMPARTMENTS THROUGH SAID SPACES AT THE ENDS OF SAID BEARING SLEEVE TO THE OUTER SURFACE OF SAID BEARING OUTWARDLY OF SAID COLLAR.