Draft arm, float-non-float, sway-non-sway, and leveling adjustment

Claim 1

IN A DRAFT ARM ASSEMBLY FOR COUPLING AN IMPLEMENT TO A TRACTOR HAVING ROCKSHAFT JOURNALLED FOR ROTATION IN THE TRACTOR FRAME, A PAIR OF DRAFT ARMS, AND MEANS COUPLING SAID DRAFT ARMS TO THE OPPOSITE ENDS OF SAID ROCKSHAFT FOR MOVEMENT THEREWITH; THE IMPROVEMENT WHEREIN EACH OF SAID COUPLING MEANS COMPRISES A HOUSING FIXEDLY SECURED TO THE ROCKSHAFT FOR MOVEMENT THEREWITH, PIVOT MEANS COUPLING THE DRAFT ARM TO SAID HOUSING FOR PIVOTAL MOVEMENT RELATIVE TO THE HOUSING ABOUT A HORIZONTAL AND A VERTICAL AXIS, FIRST MEANS MOUNTED IN SAID HOUSING FOR ADJUSTABLY POSITIONING SAID DRAFT ARM AT A SELECTED REST POSITION OF ROTATIVE ADJUSTMENT ABOUT SAID HORIZONTAL AXIS, AND SECOND MEANS OPERABLE IN A FIRST POSITION IN ENGAGEMENT WITH SAID FIRST MEANS TO LOCK SAID SHAFT ARM AGAINST ROTATION ABOUT SAID HORIZONTAL AXIS FROM SAID REST POSITION AND OPERABLE IN A SECOND POSITION TO PERMIT ROTATION OF SAID DRAFT ARM ABOUT SAID HORIZONTAL AXIS TO AND FROM SAID REST POSITION.