referring particularly to fig1 a metal base 1 , which may conveniently be a length of steel channel , has a hole 2 ( see also fig6 ) symmetrical with its vertical center line and , in the model shown , nearer the lower end of the channel . see also fig5 . the hole is sized to receive with a good fit , one end of a length of steel tube 3 welded to the channel in position such that its longitudinal axis is normal to the base of the channel . brace bars 4 , 5 , 6 and 7 are welded at their respective ends to the base and the forward end of tube 3 , as clearly shown upon fig1 to rigidify the assembly and afford a very strong pivot bearing with axis normally extending in the horizontal , fore - and - aft direction . holes 8 , fig5 through the base of channel 1 , afford means by which the hitch may be bolted to the drawbar of an agricultural implement . referring in particular to fig6 a length of steel tube 9 is sized for a smooth bearing or rotational fit in and along tube 3 . at its left end as viewed in this figure , tube 9 has a ring or collar 10 welded or threaded thereto . a rectangular plate 11 has a hole centrally therethrough to receive with a smooth fit , the right end of tube 9 , as viewed upon fig9 . the plate and tube are welded together . rings or collars 12 and 13 also fitting on and about tube shaft 9 , are welded thereto and to the plate on respective sides thereof . four equiangularly - spaced reinforcing bars 32 , 33 , 34 and 35 extend radially of ring or tube section 13 and are welded to them , to effect a strong and rigid element or part . thus as will be noted , the integrally - connected parts 9 and 11 are journaled in tube 3 , for rotation as a unit about the axis of tube 9 , which axis is normally horizontal and in the fore - and - aft direction . one or more grease nipples , not shown , are threaded into apertures in tube 3 and facilitate lubrication of the bearing surfaces between 3 and 9 . plate 11 has first and second bearing lugs or trunnions 14 and 15 welded thereto in horizontally - spaced parallel relation . as shown upon fig1 these lugs or trunnions are fixed to the forward side of the plate in symmetrical relation upon opposite sides of the common axis of tubes 3 and 9 . brace bars such as 16 and 17 for lug 14 , fig1 are welded to the lug and plate . corresponding bars for lug 15 are identified at 18 , 19 , fig4 . see also fig1 . the lugs are pierced by transversely - aligned holes 20 and 21 , ( fig4 ), which form bearings to receive a pivot bolt 22 secured in position by nut 23 and washer 24 to mount for pivotal movement about a normally transverse horizontal axis , a yoke or clevis generally identified at 25 , noting fig7 in particular . this yoke comprises a section of tubing 26 of a length to have a smooth fit between trunnion lugs 14 , 15 , and an internal diameter receiving bolt 22 , also with a smooth fit . as seen upon fig7 the yoke also includes a metal strap 27 of essentially the same width as the length of tube 26 and bent therearound through 180 ° and welded thereto to form a pair of forwardly - directed , vertically - spaced arms pierced at their forward ends with holes 28 , 29 defining a vertical axis . when the tractor is backed until its drawbar 31 enters between the forwardly - projecting arms of yoke 25 so that the hole therein is aligned with holes 28 , 29 , bolt 30 is passed downwardly through the three holes to couple the tractor to the implement &# 39 ; s drawbar or plate indicated at i , fig1 and 3 . use of the invention will be generally clear from the foregoing description . when the tractor and implement in service are connected as aforesaid and rest on an essentially horizontal surface , they are coupled for universal swiveling or relative pivoting , first about a vertical axis defined by bolt 30 , secondly about a horizontal transverse axis defined by bolt 22 , and thirdly about a horizontal fore - and - aft axis defined by the axis of tubular shaft 9 . thus the two machines are connected to accommodate angular movements between them , about three mutually - normal axes so that all couples and bending moments which might otherwise bend or break parts or interfere with smooth operation thereof are eliminated . also noted is that all parts of the novel hitch are formed of readily obtainable steel shapes and forms such as channels , tubing , straps , bars and bolts . thus machining and grinding are avoided and only welding is necessary to unite the parts into an extremely powerful hitch , long - lived and reliable in operation and relatively inexpensive to fabricate . it is of interest to note that in the present invention the pull of the tractor results in pure tension in drawbar 31 . this is converted to shear in pin 30 . the arms of yoke 25 are in tension equal to the shear in the bolt and is again converted to shear in bolt 22 , then to tension in lugs 14 , 15 and shaft 9 . as all resultant forces in shear and tension are equal and pass in a straight line from tractor to implement , the correct cross - sectional areas are readily computed for adequate strength while at the same time avoiding excessive cross sectional dimensions . due to the foregoing facts , bending moments which might otherwise unduly stress the hitch , are avoided . as modifications and changes in shape , size and relation of assembled component parts are possible , the foregoing disclosure is to be taken in an illustrative rather than a limiting sense . it is within the purview of this invention , to make tubes 3 and 9 of high carbon or case hardened steel to enhance the strength and wearing qualities thereof . in the claims , for clarity in pointing out the invention , the terms &# 34 ; horizontal &# 34 ;, &# 34 ; vertical &# 34 ;, &# 34 ; normal &# 34 ;, etc ., refer to the position of the parts of the hitch when connected between a tractor and implement resting upon a substantially plane horizontal surface , and are not to be interpreted as limiting the hitch to use in a position with its defined axes in a fixed relation with the horizontal and vertical . the term &# 34 ; fore - and - aft &# 34 ;, &# 34 ; forward &# 34 ; and &# 34 ; rearward &# 34 ; relate to the horizontal direction of travel when the tractor is pulling the implement straight ahead .