US2147631A - Road grader - Google Patents

Description

Feb. 21, 1939.

F. E. ARNDT 2,147,631

" ROAD GRADER Original Filed Feb. 25, 1932 s Sheets-sheaf 1 /N VEN TOR 3 Sheets-Sheet 2 Feb. 21, 1939. FE ARNDT' I ROAD GRADER Original Filed Feb. 23, 1952 ATT'Y VENTOR Frank/1h E. Arnaf Feb. 21, 1939. F E ARNDT 2,147,631

" ROAD GRADER 7 Original Filed Feb. 23, 1932 3 SheetsSheet 3 I5 30 28 ra 34 (5) 32 al; 2 68 a 58 VVENTOR:

. Frank/in E. Arndf A T'Y Patented Feb. 21, 1939 UNITED. STATES ROAD GBADER Franklin E. Arndt, Gallon, Ohio, assignor w The Gallon Iron Works & Mfg. 00., a corporation of Ohio Application February 23, 1932, Serial No. 594,599 Renewed February 10, 1936.

42 Claims.

My invention relates to road graders and one of its objects is the provision of an improved and efiicient mechanism for adjusting a mold board for operation either on the horizontal surface of the roadway or in an upright position for the purpose of acting upon banks to cut material therefrom.

Other objects of the invention will appear hereinafter, the novel features and combinations being set forth in the appended claims.

In the accompanying drawings, Fig. 1 is an elevational view of a road grader embodying my improvements.

Fig. 2 is a rear view of the mold board adjusting mechanism with the frame of the vehicle omitted.

Fig. 3 is a plan view of the road grader shown in Fig. l.

Fig. 4 is a rear view of the road grader embodying my improvements and showing the mold board in position for operation on a bank at the side of the roadway.

Fig. 5 is an enlarged sectional view of a portion of the operating mechanism for shifting the mold board from its horizontal to its upright position.

Fig. 6 illustrates the elevated position of the mold board preparatory to moving it to its upright bank operating position; and

Fig. 7 shows the position of the mold board after being moved away from its bank operating position preparatory to restoring it to its horizontal position.

Referring to Fig. 1, 8 designates the frame of the road grader mounted on wheels 3, l0 and provided with the draw bar H and the yielding support [2 for the latter and the steering frame I3 connecting through a series of universally connected links l4 for operation by means of the wheel l5 by the operator standing on the 7 platform l6.

The mold board I! is pivoted ,at l8 to the supporting frame l9 which may be the usual circle adjustable on an upright axis on the frame 20. As illustrated in Fig. 2, the frame I9 may comprise the circle 2| and the depending arms 22, 22 which are pivoted at [8, 18 to the mold board ll. By means of a bolt at 23 extending through one of the perforations 24 in the rod 25 pivoted at 26 to the mold board I! the latter may be adjustably held onits pivots l8.

The frame 20 as shown in the plan view (Fig. 3) is an elongated triangular frame with its apex 23 at its forward end connected by the ball and socket joint 24 to the forward end of the frame 8 of the vehicle. The frame 8 is relatively narrow and elongated so as not to interfere with the shifting of the mold board from its horizontal position in the roadway to its upright position at either side of the grader.

Rigidly connecting the diagonal bars of the frame 20 is a transverse cross piece 20' to the ends of which are connectedby means of universal ball joints 21 and 28 the upright links 29 and 30. The upper ends of the links 29 and 30 are connected by means of the universal ball joints 3| and 32 to the crank arms 33 and 34 which are keyed to shafts 35, 36 extending from the worm gear casings 31 and 38. By means of reduction gearing illustrated at 39, 40 and 4|, 42, worms on the shafts 43, 44 may be rotated to operate the Worm wheels in the worm gear housings' 31, 38. Shafts 45, 46 may be connected by means of the universal joints 41, 48 to the extensible shafts 43, 50, which in turn are connected by means of universal joints 5|, 52 to the operating wheels 53, 54. It should be understood that the relatively sliding parts of shafts 49 and 50 cannot rotate relatively to each other and therefore when the wheels 53 and 54 are turned, rotary movement will be transmitted to the shafts 45, 46, as shown in Fig. 2, to operate the reduction gearing and in turn operate the worm gearing to turn the cranks 33, 34.

The wheels 53, 54 and their connections to the universal joints 21 and 28 are operative individually and independently of each other. By operating the wheel 53, the corresponding side of the circle 2| or the corresponding end of the mold board l'l may be lifted by turning the frame 20 on the ball and socket joint 24 as a pivot. By turning the wheel 54 the crank 34 may be turned to lift or lower the universal joint 28 and consequently turn the frame 20to adjust the elevation of the mold board ll. It must be seen that by means of the construction shown, the wheels 53 and 54 may be operated to adjust the elevation of the mold board I! at the surface of the roadway and also the inclination thereof. That is to say, when the machine illustrated is being used as a roadway grader, the wheels 53, 54 may be used to operate the connections and apparatus illustrated to adjust the inclination and elevation of the mold board.

Provision is also made for swinging the mold board from the position shown in Fig. 2 to the position in Fig. 6 to afford ample clearance for movement of the mold board from its horizontal position to its upright bank operating position. By means of the wheels 53, 54 the crank arms 33, 34 may be moved to their vertical positions shown in Fig. 6. The universal joints 3|, 32 will then occupy their uppermost positions. Now by rotating the wheel 55, the extensible shaft 56 may be rotated to turn the shaft 51 and thereby operate the bevel gearing 58 and the worm wheel mechanism 59 connected thereto, to rotate the shaft 60 to which is fixed the crank arm 6!. A link 62 is connected at one end by the universal joint 63 to the crank arm 6| and at the other end by means of the universal joint 64 to the cross piece 20' of the frame 20, which is swiveled by means of the ball and socket joint 24 to the forward end of the vehicle frame 8.

By referring to Fig. 6, it will be seen that when the wheel 55 is operated, the swinging of the crank arm 6| to its position as shown will swing the mold board upwardly off the road surface in accordance with the swinging movements of the links 29, 30 on their upper pivotal connections at 3|, 32 to the crank arms 33, 34.

As shown in Fig. 4, an upright frame 65 is rigidly connected to the vehicle frame 8. Secured rigidly to the frame 65 is a ring or circular frame 66, 66 for guiding an outer frame 61 to which are rigidly connected gear casings 31 and 38.

By means of the wheel 68, adjacent the platform [6, the shaft 63 may be rotated to transmit movement through the bevel gears 10 to the shaft H. The shaft TI is connected by means of the worm 13 to worm wheel 14 in the worm gear casing 15 as shown in Figs. 5 and 6.

The enlarged sectional view of Fig. 5 shows that the worm wheel 14 is connected by means of the shaft 16 to the pinion 11 mounted in the stationary bearings 18' on the circular frame 66. The pinion Tl meshes with the annular gear 18 on the inner side of the ring 61. It will be seen that when the wheel 68 is rotated, the mold board l1 may be shifted from its position shown in Fig. 6 to its position shown in Fig. 7. Then by operating the wheel 55, the mold board may be moved outwardly from its position shown in Fig. '7 to its bank cutting position shown in Fig. 4. The

height of the lower end of the mold board may be adjusted by turning the wheel 55 and its inclination may be adjusted by turning the wheel 68.

Between the rear axle l9 and platform I6 is mounted the usual wheel alining mechanism 80.

It should also be understood that the mold board may be adjusted to various laterally extending positions. For instance, when the mold board is in its horizontal position shown in Fig. 6, while extending to one side of the vehicle frame, it may be let down to the road surface by operating the cranks 33, 34 through a suificient angle for such purpose. In a similar manner the mold board may be shifted to the opposite side of the vehicle and operated, while extending laterally therefrom, at the road surface. The simplicity of the construction and the flexibility thereof enables the machine to be very efficiently operated in various adjusted road grading positions, as

annular gear I8. This axis of rotation extendslongitudinally of the vehicle frame and is fixed relative to the latter. The crank arms 33 and 34 may be moved to the upright position shown in Fig. 6 with the hangers 29 and 30 in parallelism to each other. Consequently, when the link 62 is pulled toward the right as viewed in Fig. 6 the mold board will be moved upwardly and laterally while its lower cutting edge will occupy horizontal positions at various elevations in parallelism to each other and parallel to the road surface. Therefore, whenever the upper pivotal connections between the hangers 29 and 30 and the crank arms 33 and 34 are at equal elevations the hangers 29 will be parallel to each other and constitute parallel motion mechanism for adjusting the lower cutting edge of the mold board to various elevations in parallelism to each other. When the mold board is in bank cutting position as shown in Fig. 7 and the pivotal connections 3| and 32 are equidistant from the outer or cutting edge of the mold board such cutting edge may be adjusted to various bank cutting positions in parallelism to each other. These operations may be effected because the pivotal axes of the crank arms 33 and 34 extend transversely of the main and tertiary frames. When the mold board is in the horizontal position shown in Fig. 6 and when it is in the upright position shown in Fig. 7 a line extending through the pivots 35 and 36 is parallel to the cutting edge of the mold board and parallel to a line extending through the pivots 21 and 28. Figs. 6 and 7 also show the pivots 3| and 32 in a transverse line parallel to the cutting edge of the mold board. Of course, the crank arms 33 and 34 may be operated independently of each other and may each be adjusted to various positions other than those shown in Figs. 6 and 7, but the parallel motion mechanism referred to has the advantage of enabling the mold board to be adjusted efiiciently for horizontal road grading surfaces and also moved to such an elevation as to enable the mold board to be moved to such an upright cutting position that its cutting edge will be entirely off to one side of the path of travel of the vehicle, as shown in Fig. 7. It should also be understood that the mold board may be moved to the opposite side of the machine to occupy'an upright cutting position with the cutting edge of the mold board spaced entirely beyond the path of travel of the vehicle. Furthermore, whether the mold board is in a bank cutting position at one side of the machine or at the other side thereof, the cutting edge may be adjusted to various positions of inclination and to various distances from the path of travel of the vehicle.

Obviously, those skilled in the art may make various changes in the details and arrangement of parts without departing from the spirit and scope of the invention as defined by the claims hereto appended and I wish therefore not to be restricted to the precise construction herein disclosed.

Having thus described and shown an embodiment of my invention, what I desire to secure by Letters Patent of the United States is:-

1. In a grader, the combination with a supporting frame, of a supplemental frame connected at its forward end to said supporting frame, a mold board mounted on said supplemental frame, a tertiary frame adjustably mounted on the main frame, and means for changing the position of said mold board from horizontal to upright by turning said tertiary frame.

2. In a grader, the combination with a supporting frame, of a supplemental frame adjustable relatively thereto, a mold board on said supplemental frame, means for supporting said supplemental frame for adjusting said mold board in elevation and. inclination and laterally, and mechanism for adjusting said supporting means on a single axis to move the mold board to an upright position.

3. In a road grader, the combination with a main frame, of a supplemental frame connected thereto for adjustment relatively thereto, a scraper mounted on said supplemental frame, lifting rods connected to said supplemental frame, worm and worm wheel lifting devices connected to said lifting rods, universal joints at the ends of said lifting rods, an operating wheel for each lifting device, connections between each wheel and its lifting device, means comprising worm and worm wheel mechanism for shifting said scraper laterally relatively to said supporting frame, and a one point operating mechanism for shifting the scraper to an upright position at one side of the grader.

4. In a road grader, the combination with a supporting frame, of a supplemental frame adjustably mounted thereon, a mold board on said supplemental frame, a tertiary frame, lifting mechanism connected between said tertiary frame and said supplemental frame, and means connected between said supporting frame and said tertiary frame to rotate the latter to change the position of said mold board from horizontal to upright.

5. In a road grader, the combination with a main frame, of a supplemental frame swiveled thereto to rotate on a longitudinal axis, a mold board mounted on said supplemental frame, a tertiary frame, an annular bearing for said tertiary frame, lifting mechanism between said tertiary frame and' said supplemental frame, means connected between said tertiary frame and said supplemental frame for shifting the mold board laterally relatively to said main frame, and means between said main frame and said tertiary frame for swinging said mold board from a horizontal position to an upright bank cutting position. a

6. In a grader, the combination with a main frame, of a supplemental frame adjustable relatively thereto, a mold board mounted on said supplemental frame, mechanism for lifting the mold board to a position spaced above the road surface to provide ample clearance for movement to upright position, and means for moving said mold board about a single axis relatively to said main frame to upright position for bank cutting.

7. In a bank cutting machine, the combination with a main frame, of a supplemental frame, a cutting blade on said supplemental frame, a tertiary frame, adjusting connections between said tertiary frame and said supplemental frame,

means for adjusting said tertiary frame to vary the inclination of said cutting blade in upright position, and means operating through said-adjusting connections to adjust the distance of said cutting blade from said main frame.

8. In a grader, the combination with a travelling supporting frame, of a supplemental frame swivelled thereto, a mold board carried by said supplemental frame, a tertiary frame adjustably mounted on said supporting frame, adjustable supporting connections between said tertiary frame and said supplemental frame, and means for adjusting said tertiary frame to move said mold board to an upright bank cutting position.

9. In a grader, the combination with a supporting frame, of a supplemental frame adjustably mounted on said supporting frame, a scraper 1 blade on said supplemental frame, means comprising hangers pivoted at their lower ends to said supplemental frame for adjusting the elevation and inclination of said scraper blade, means connected to said supplemental frame for varying the elevation of said scraper blade while the said hangers remain in parallelism with their upper ends at equal elevations, and a rotary frame for carrying said last-named means.

10. In a grader, the combination with a supporting frame, of a supplemental frame, a mold board carried by the supplemental frame, spacedapart hangers pivotally connected to said supplemental frame, means comprising crank arms pivoted'on axes extending transversely of said supporting frame and pivotally connected to the upper ends of said hangers to operate the latter to adjust said supplemental frame and said mold board, means pivotally connected to said supplemental frame to swing the latter while supported by said hangers, and an adjustable tertiary frame for carrying said supplemental frame and the parts connected thereto.

11. In a grader, the combination with a main frame, of a supplemental frame, a mold board on said supplemental frame, spaced-apart hangers pivotally connected at their lower ends to said supplemental frame, means comprising crank arms pivotally connected to the upper ends of said hangers for operating the latter, means for swinging the supplemental frame while said hangers are in parallelism and the upper ends thereof are at equal elevations to effect variation in elevation of said mold board to various positions in parallelism to each other, and means for adjusting said swinging means to opposite sides of a vertical plane extending through the center line of the machine.

12. In a road grader, the combination with a main frame, of a supplemental frame, a mold board carried by said supplemental frame,'

spaced-apart hangers, means for operating said hangers and capable of supporting said supplemental frame for adjustment of said mold board in elevation to various positions in parallelism to each other, mechanism for effecting such adjustment while said hangers remain in parallelism to each other, and an adjustable tertiary frame for supporting as a unit said supplemental frame and the parts connected thereto.

13. In a road grader, the combination with a main frame, of a supplemental frame, a mold board carried by said supplemental frame, spaced-apart hangers pivotally connected to said supplemental frame, means pivotally connected to said hangers for operating the same, means for moving said supplemental frame to adjust said mold board to various positions in parallelism to each other while said hangers remain parallel to each other, and additional means for adjusting as a unit said supplemental frame and the parts connected thereto.

14. In a road grader, the combination with a main frame, of a supplemental frame, a mold board on said supplemental frame, spaced-apart hangers pivotally connected to said supplemental frame, means pivotally connected to said hangers for operating the same, means for moving the mold board endwise to various positions in par allelism to each other while said hangers are parallel to each other, and additional means for shifting said mold board while the latter remains main frame, of a supplemental frame, a mold board carried by said supplemental frame, spaced-apart hangers pivotally connected to said supplemental frame, means pivotally connected to said hangers for operating the same independently of each other, means pivotally connected to said supplemental frame to effect adjustment of said mold board to various positions in parallelism to each other while said hangers are parallel to each other, and a rotary tertiary adjustable frame for carrying said supplemental frame and the parts connected thereto.

16. In a road grader, the combination with a main frame, of a supplemental frame, a mold board on said supplemental frame, spaced-apart hangers pivotally connected to said supplemental frame, means comprising crank arms pivoted on axes extending transversely of the main frame and pivotally connected to said hangers for operating the latter, means pivotally connected to said supplemental frame for adjusting the mold board, and an adjustable tertiary frame for carrying as a unit said supplemental frame and the parts connected thereto.

17. In a road grader, the combination with a main frame, of a supplemental frame, a mold board on saidsupplemental frame, and mechanism rotatable on a horizontal longitudinal axis for shifting the supplemental frame and said mold board from a position extending laterally of the road surface to an upright position with the cutting edge of the mold board outside of the path of travel of said supporting frame.

18. In a road grader, the combination with a wheel-supported main frame, of a supplemental frame, a mold board on said supplemental frame and adapted to occupy a road grading position, mechanism for supporting said mold board in a position extending laterally of the road surface or in an upright position with its cutting edge entirely off to one side of the path of travel of said main frame, and means for adjusting the supplemental frame to change the position of the mold board from its first-named position to its said upright position, said adjusting means comprising mechanism for first lifting the mold board along vertical lines and then moving the same along arcuate lines.

19. In a road grader, the combination with a vehicle comprising a main frame, of 'a supplemental frame, a mold board on said supplemental frame, means for adjusting the height of the mold board while its lower cutting edge remains parallel to the road surface, mechanism for supporting said mold board for rotary adjustment to a bank cutting position entirely beyond one side of the path of travel of the vehicle, and rotatable means for effecting adjustment of the mold board from an elevated horizontal position to its upright bank cutting popsition.

20. In a bank sloping machine, the combination with a vehicle comprising a supporting frame, of a mold board, mechanism for supporting said mold board in an upright bank cutting position with its cutting edge entirely outside of the path of travel of the vehicle, and means for adjusting the position of said mold board relative to such path of travel with its cutting edge in various positions in parallelism to each other.

21. In a grader, the combination with a vehicle comprising a supporting frame, of a mold board, mechanism for supporting said mold board to occupy positions with its cutting edge entirely beyond either side of the path of travel of the vehicle as well as various intermediate positions in parallelism to each other, and means for adjusting said mold board to such parallel positions as those aforesaid.

22. In a grader, the combinatiori with a vehicle comprising a supporting frame, of a supplemental frame, a mold board on said supplemental frame, means for adjusting the height of the mold board, mechanism for effecting lateral shifting of the mold board, and means for bodily rotating the supplemental frame and said mold board together with said adjusting means and shifting mechanism on a horizontal longitudinal axis to efiect adjustment of the mold board to upright bank cutting position.

23. In a grader, the combination with a vehicle comprising a supporting frame, of a mold board, mechanism for supporting said mold board for arcuate adjustment on a fixed axis relative to said supporting frame, and means for effecting such arcuate adjustment to move the mold board to upright bank cutting position from a road grading position.

24. In a grader, the combination with a vehicle comprising a supporting frame, of a mold board, mechanism for supporting said mold board for adjustment relative to the road surface to be graded beneath the macline, means for effecting such adjustment, and means for rotating bodily the mold board to an upwardly extending bank cutting position on a longitudinal axis fixed relative to said supporting frame.

25. In a bank cutting machine, the combination with a main frame, of a supplemental frame, a cutting blade mounted on said supplemental frame, means for adjustably supporting said cutting blade in upright position for bank cutting operations, single actuating means, and mechanism operable by said single actuating means for shifting said blade in one continuous movement from such upright position to a position under said main frame for transportation.

26. In a road grading machine, the combination with a vehicle, of a frame pivotally connected at one end to said vehicle, a blade carried by said frame, vertically adjustable members mounted on said vehicle, connecting means between said members and the free end of said frame, and means for moving the rear end of the frame laterally of the vehicle when said vertically adjustable members are in their highest positions and thereby move said blade to an inclined bank-sloping position at one side of the vehicle.

27. In a bank-sloping machine, the combination with a vehicle, of a frame connected at one end to said vehicle for adjustment relative thereto, a cutting blade carried by said frame, means for supporting said frame for adjustment of said blade in elevation and laterally relative to the vehicle, mechanism for moving the said 'frame relatively to the vehicle to effect such adjustment of said blade in elevation and laterally relative to the vehicle to provide ample clearance from the road surface for movement of the blade to banksloping position, and mechanism for effecting ad-- justment of the cutting blade to bank-sloping position at one side of the machine while such blade is supported in such adjusted position for clearing the road surface.

28. In a bank-sloping machine, the combination with a portable supporting frame, of a supplemental frame adjustably mounted thereon, a mold-board on said supplemental frame, a rotary frame on said first-named frame, connecting means between said rotary frame and said supplemental frame for adjustably supporting said mold-board relative to the road surface, and mechanism for rotating said rotary frame to impart movement through said connecting means to said supplemental frame to adjust the mold-board to bank-sloping position at one side of the machine.

29. In a bank-sloping machine, the combination with a traveling supporting frame, of a supplemental frame swiveled thereto,-a mold-board carried by said supplemental frame, a tertiary frame adjustably mounted on said supplemental frame, adjustable supporting connections between said tertiary frame and said supplemental frame, and means for adjusting said tertiary frame together with'said supporting connections and said supplemental frame and mold-board as a unit to effect adjustment of the mold-board to banksloping position.

30.'In a bank-cutting machine, the combination with a portable main frame, of a drawbar connected at its front end to said main frame for free movement relatively thereto, a blade carried by the rear end of said drawbar, means for elevating the rear end of the drawbar and shifting it laterally of the vehicle to adjust the blade to a laterally shifted position under the supporting frame and elevated above the road surface, and mechanism for effecting movement of theblade from such laterally shifted and elevated position ..nder the supporting frame to an inclined bankcutting position at one side of the vehicle.

31. In a road grader, the combination with a a vehicle, of a frame flexibly connected to said vehicle, a blade carried by said frame, vertically adjustable members mounted on said vehicle, links connecting said members and the free end of said frame, means including a crank arm rotatable about a horizontal axis and a link connecting the outer end of said crank arm and said frame for moving the free end of said frame laterally while supported by said links and the connection between said frame and said vehicle, a rotary frame mounted on said vehicle and connected to said vertically adjustable members and to said crank arm to support the same for bodily rotary movement in unison, and means for rotating said frame to shift the blade to bank-sloping position at one side of the vehicle.

32. In a bank-cutting machine, the combination with a portable main frame, of a drawbar supported at its front end upon said main frame forfree movement relative thereto, a blade carried by the rear end of said drawbar, spaced-apart adjustable means to support the drawbar for laterally swinging movement relatively to the main frame and for adjustment in elevation relative to the road surface, means. for effecting variation in elevation of the grader blade relative to the road surface, mechanism for laterally shifting the blade while underthe main frame, and mechanism for effecting movement of the blade from its elevated laterally shifted position under the main frame to an inclined bank-cutting position at one side of the main frame.

33. In a bank-cutting machine, the combination with a portable main frame, of a drawbar supported at its front end upon said main frame for free movement relatively thereto, a blade carried by the rear end of said drawbar, means comprising cranks rotatable in planes extending longitudinally of said main frame for adjusting the elevation of said blade relative to the road surface, mechanism comprising a crank rotatable in a plane extending transversely of said main frame for shifting the blade laterally of said main frame while supported under the same, and

mechanism for revolving the rear end of said drawbar to effect adjustment of the mold-board from its laterally shifted elevated position under the main frame to an inclined bank-cutting position at one side of the main frame.

' 34. In a road grader, the combination with a vehicle comprising front and rear supporting wheel means interconnected by a main frame supported by said wheel means, of a drawbar frame, means attaching the front end of said drawbar frame to said vehicle for pivotal movement, an earth working tool carried by said drawbar frame, mechanism for adjusting said drawbar frame and tool relative to said main frame comprising adjustable hang rod means connected to opposite sides of said drawbar 'frame, a tertiary adjustable frame movable along an arc of a circle encircling said main frame,

and laterally shifting mechanism pivotally connected to said tertiary frame and to said drawbar frame and adjustable as to effective length to vary the distance between the points of pivotal connection of said laterally shifting mechanism to said tertiary frame and said drawbar frame.

35. In a road grader, the combination with a vehicle comprising front and rear supporting wheel means interconnected bya main frame supported by said wheel means, of a drawbar frame, means attaching the front end of said drawbar frame to said vehicle for pivotal movement, an earth working tool carried by said drawbar frame, mechanism for adjusting said drawbar frame and tool relative to said main frame comprising adjustable hang rod means connected to opposite sides of said drawbar frame, a tertiary frame adjustably mounted on said main frame, adjustable laterally shifting mechanism interconnecting said tertiary frame and said drawbar frame, said laterally shifting mechanism being rigid in. any adjusted position, and operating mechanism operable from an operator's station for adjusting the effective length of said laterally shifting mechanism.

36. In a road grader, the combination with a vehicle comprising front wheel means, rear wheel means, and a main frame interconnecting said means and supported thereby, of a drawbar frame, means attaching the front of said drawbar frame to said vehicle for free pivotal movement, an earth working tool carried by said drawbar frame, mechanism for adjusting said tool and drawbar frame relative to said main frame comprising, a'tertiary frame of arcuate shape movable along an arc of a circle which encircles said main frame, bearing means on said main frame supporting said tertiary frame for arcuate adjustment, a rack on said tertiary frame, pinion means cooperating with said rack to adjust said tertiary frame relative to said main frame, a mechanism comprising a link interconnecting said tertiary frame and said drawbar frame, and means for adjustably supporting said drawbar frame from said main frame including hang rods.

37. In a road grader, the combination with a vehicle comprising front wheel means, rear wheel means, and a main frame interconnecting said means and supported thereby, of a drawbar frame, means attaching the front of said drawbar frame to said vehicle for free pivotal movement, an earth working tool carried by said drawbar frame, mechanism for adjusting said tool and drawbar frame relative to said main frame comprising, a tertiary frame of arcuate shape movable along an arc of a circle which encircles said main frame, bearing means on said main frame supporting said tertiary frame for arcuate adjustment, mechanism comprising a link interconnecting said tertiary frame and said drawbar frame, and means for adjustably supporting said drawbar frame from said main frame including a hang rod which is attached to said tertiary frame.

38. In a road grader the combination with a vehicle comprising front wheel means, rear wheel means, and a main frame interconnecting said means and supported thereby, of a drawbar frame, means attaching the front of said drawbar frame to said vehicle for free pivotal movement, an earth working tool carried by said drawbar frame, mechanism for adjusting said tool and drawbar frame relative to said main frame comprising, a tertiary frame of arcuate shape movable along an arc of a circle which encircles said main frame, bearing means on said main frame supporting said tertiary frame for arcuate adjustment, mechanism comprising a link interconnecting said tertiary frame and said drawbar frame, and means for adjustably supporting said drawbar frame from said main frame including hang rods.

39. In a road grader, the combination with a vehicle comprising front wheel means, rear wheel means, and a main frame interconnecting said means and supported thereby, of a drawbar frame, means attaching the front of said drawbar frame to said vehicle for free pivotal movement, an earth working tool carried by said drawbar frame, mechanism for adjusting said tool and drawbar frame relative to saidmain frame comprising, a tertiary frame of arcuate shape movable along an arc of a circle which encircles said main frame, bearing means on said main frame supporting said tertiary frame for arcuate adjustment, operator controlled mechanism for locking said tertiary frame on said bearing means, mechanism comprising a link interconnecting said tertiary frame and said drawbar frame, and means for adjustably supporting said drawbar frame from said main frame including hang rods.

40. In a road grader, the combination with a vehicle comprising front wheel means, rear wheel means, and a main frame interconnecting said means and supported thereby, of a drawbar frame pivotally attached at its front end to said vehicle, an earth working tool carried by said drawbar frame, means including adjustable hang rod mechanism for adjustably supporting the opposite sides of said drawbar frame from said main frame, a tertiary frame mounted on said main frame, and laterally shifting means comprisingextensible mechanism having a. pivotal connection to said tertiary frame and having another pivotal connection to said drawbar frame, said laterally shifting mechanism being adjustable to vary and rigidly maintain the distance between said points of pivotal connection thereof, the pivotal connection to said tertiary frame shifting when said tertiary frame is adjusted.

41. In a road grader, the combination with a vehicle having front and rear wheel means and an interconnecting main frame supported thereby, of a drawbar frame pivoted at its front end to said vehicle, adjustable hang rod mechanism for adjustably supporting the rear end of said drawbar frame from said vehicle, a tertiary frame mounted for arcuate adjustment on said main frame and having thereon a pivot point which moves through an arc of a circle when said tertiary frame is adjusted, and laterally shifting mechanism adjustable as to effective length pivotally connected to said pivot point and to said drawbar frame, said laterally shifting mechanism being rigid in any adjusted position.

42. In a road grader, the combination with a vehicle having front and rear wheel means and an interconnecting main frame supported thereby, of a drawbar frame pivoted at its front end to said vehicle, adjustable hang rod mechanism for adjustably supporting the rear end o said drawbar frame from said vehicle, a tertiary frame mounted for adjustment on said main frame and having thereon a pivot point which moves through an arc of a circle when said tertiary frame is adjusted which circle surrounds said main frame, and mechanism comprising a link

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