US1660050A - Road grader - Google Patents

Description

Feb.7 21, 1928. 1,660,050

A. G. RONNING ET AL ROAD GRADER Filed July 18. 1924 4 Sheets-Sheet 1 u l l Feb. 21, 1928.

A. G. RONNING ET AL ROAD GRADER Filed July 1s. 1924 4 Sheeas-Sheei'l 2 Feb. 21, 192s. 1,660,050

A. G. RONNING ET AL ROAD GRADER "Filed July 18. 1924 4 sheets-sheet 5 PZ E #C ATTORNEY Feb. 21, 1928. 1,660,050

A. G. RONNING ET AL ROAD G RADER l Filed July 18. 1924 4 sheets-sheet 4v *mz3-137 Vzw om 1.90 o zal U 19o IN u l o a 6? 4 15a A d 1': l les 88 g l zw L:o o l? l86 o o O 0\@ Jaa -IQ 1E| W97 .91 rje, 1Km? IMA?!l 187 lg ll- ATTORNEY Famed Feb. 21, 1928.

UNITED STATES l 1,660,050 PATENT oF1-1c1-:.

ANDREAN G. RoNNING AND Anonrn n oNNING, or MINNEAPOLIS, MINNESOTA..

Roan GRADEN.

applic-timaY med July 1s,

This invention relates to grading machines and the primary object is to provide a grader' and a frame mounting therefor which renders it particularly adaptable for use in con- `nection with tractors of the well known object is to provide a container for surfacing material and means-for distributing or spreading such material either in advance or. rearwardly of the grader implement. These and a number of other objects are affected by the novel, ingenious and practical construction and arrangement of parts which will now be described and claimed, and which are all clearly and distinctly illustrated in the accompanying drawings, which form a partofthis specification, and' in which:

Fig. 1 is a side elevation of a complete l machine embodying thefprinciples of our in# vention, a portion of the container being broken away and some parts being omitted. Fig. 2 is a rear view of themachine as shown in Fig. 1.v

Fig. 3 is a front elevation of the front end 'of the machine.

Fig. 4 is a side elevation similar to Fig. 1, but showing certain modifications thereover.

Fig. 5 is aV top or plan view of the ma- `chine as shown 1n Fig. 4.

Fig. 6. is a side elevation of a preferred construction, showing" certain further modications inthe machine, and with end portions thereof broken away. 4

Fig. 7 isv al rear view of the machine shown in Fig. 6.

Fig. 8 is an enlarged detail sectional view as on the line 8.-8 in Fig. 5.

Fig. l9 is' an' enlarged fractional detail view of a certain -driving connection which will later be described in detail.

Fig. 10 is an 'enlarged detail section on the line. 10-10'in Fig. 6.

Fig. 11 `is a plan View .0f the grader de- 1924. Serial N0. 726,662.

vices proper, as seen about as on the line 11-11 in Fig. 6.

Fig. 12 is an enlarged detail plan view, showing the shaft 163 (with a central portion broken out), and the drive connections at its opposite ends, as seen when looking down upon these parts as shown in Figs. 6 and 7.

Referring to the drawings more particularly and by reference characters A designatesV a tractor unit of the F ordson type, to

which is secured and from which rearwardly extends an auxiliary frame B, a yokeC at the front end of the machine being substituted for the normal fore carriage or steering truck D of the tractor, so as to support the .front end of the tractor when the .fore carnage has been removed. The construction of the frame B, its application to-thef -tractor A, and themethod of operating the new machine which is thus formed, is ,illustrated and described in our co-pending ap- .plication Serial No. 717,511, which was filed on June 3rd,. 1924. In thatv case the` structure illustrated isconfined to one in which the front truck D of the tractor is removed and applied to the rear end of the auxiliary frame. This we have.y also shown in the present case, as in Figs. 6 and 7, but in Figs. 1, 2 and 4, the normal steering truck of the tractor is not utilized for any purpose, and the rear end of the frame B is supported by a. roller carriage E, which is more suited to a road working machine under certain 4circumstances. v

The construction and steering operation of the truck D, as shown in Figs. 6 'and 7, may be .briefly described as follows: The truck or carriage D consists of an axle 141 to the ends of which are secured, by thecustomary spindle membersD1, the steering wheels D2, which 4are-simultaneously angled lor turned by a connecting rod which 1s not here shown, but is shown as at 21' in our crank D6 (Fig. 6), or one similar to it, controlled by the hand wheel 33. When the truck D is used in the new arrangement, however, the -rod D* 1s extended forwardly,

and is actuated by the ciank D6 -througli the medium of an extension i'od D7, which is slidably secured to the franie B by brackets D8, and a connecting rod D9. The character D10 designates theusual'radius rod of the axle 141 and connects the axle with a frame member D11. As the axle is pivoted, as at D12, to the depending bolster D13 of the around-an idler pulley 31, and is then woundl frame, it will be seen that it may tilt, in the usual manner in a transverse plane, with respect to the machine, but will be held against rotation in a horizontal plane. It will also be noted that it is also a simple matter to steerl the wheels D2 by connecting them up with the normal steering apparatus of the tractor, with theaid of the mechanism we have just described.

Referring (now to Figs. 1 and 2 of the drawings, the numeral designates a yoke or frame in the arms of which are journaled the ends of a shaft 16, which carries a drum or roller 17; The yoke 15 is pivotally secured, for transverse tilting movement, by a pivot 18, -to a casting 19, which is journaled to rotate on a vertical center from the frame B, and which is provided with a worm gear 20 adapted to be actuated or. rotated by a worin 21, on a shaft 22. This shaft 22 l1 as aJ bevel pinion 23,which meshes with a similar pinion 24l on a vvertical shaft 25, which, with a handv wheel 26, forms the steering column. This steering column is arranged adjacent to a seat or support 27, near the rear end of the frame, so that the operator at this point may steer and control the machine and all its parts.

It may here be stated that the machines shown in Figs. 1, 2, 4 and 5' are provided with dual controls so that the entire machine may be controlled either from the tractor seat 28 or by an operator sittingfin the rear seat 27. In the manually steered device shown in Figs. 1 and 2, the steering can also be affected from the front or tractor -seat by means of a cable 29 which is Wound around a sheave 30 on thev shaft 25, passes around a spool 32 which is rotated by the normal tractor steering hand wheel 33.

In the manually controlled buit power steered device shown in Figs. 4, 5 and 8 the worm ring gear 20 is rotated by a worm 34 o na shaft 35, which is provided with a fi'ictioXwheel 36 adapted to frictionally engage a'disc/ 37 or a disc 38, depending upon the direction of rotation desired. The positionl of i,the wheel 36 is determined by a bell crank yoke 39 which is controlled either from the i front'steering column 40, by "a rod 41, or

:from the rear steering column 42 by a rod 43. The two'discs 37, 38 are secured on a shaft 44 which is continuously rotated by thejpower shaft 45 of the engine through 'the 'medium of bevel pinions 46, shaft 47 a worm 48 and a Worm gear 49.

carriesv a smallfrictional wheel 50, which is slidably keyed to it, and which continuously engages a disc 51 on an inclined shaft 52, the frictional resistance between the two wheels being adjustable by a lock nut device 53. The wheel is movable to or* to either side of the dead centervof the disc 51, by a forked member 54, controlled by Aa hand leve i 55,5through a :rodV 56. The shaft 52, by means of bevel pinions 57, rotates a shaft 58, of an endless carrier 59, the upper run of which is arranged to move in either direction over the floor of a container 61. Thus material within the container may bev motive power, so that it may be delivered -either forwardly or rearwardly of the grader, as may be desired, and as hausalready been set forth in the above mentioned application Ser. No. 717,511.

'The driving connection between the power shaft 45 ofthe engine and the carrier 59, asshowii in Figs. 1 and 2 is s omewhat simpliied, and consists of a pair of pinion driven shafts 62 and 63, thelatter of which has a friction roller 64 which is adjustably engageable with a disc 65, on the. shaft 58, by a fork 66 'on a rod 67. lThis rod 67 is slidable in bearings 68. At its front end it connects with a. hand lever 69, so that it can be regulated from the'front. seat 28, and it may also be regulated from the rear seat 27, by a lever 70, through a shaft 71 and an operating 'finger 72.

The usual clutch lever 73 and the gear shifting lever 74 of the tractor may also be controlled from the rear seat 27 by extension devices which are shown in Fig. 1, and will now be described. Thel c -lutch lever 73, which is pivoted as at 75 is d epressed by the foot of the operator (sitting inthe seat 28) before the-speed lever 74 may be shifted. It is connected by a cable 76 to the arm /77 of the shaft having a foot pedal 79 so that -when the pedal 7 S) is depressed by an operator in the seat 27 it will release the clutch the same as when the front lever 73 is pressed down. The lever 74 is also controlled from the rear seat by a slidably journal'ed shaft 80 having a handlever 81` at its rear end for turning and slidingthe shaft. The front ond of the shaft vhas a ingepiI 82 which universally engages a bracket 83', secured on the lever` 74; sothat by operating 'the hand lever 8l the lever'74 may be shifted either transversely or forth'f/and back, to affect, the de- A i A cured under the frame 84, 87, and rotatably adjustable with res ect thereto, is a circular supporting mem er 88, known as a cir-- cle, and under itis secured, bybrackets 89 and braces 90, the scraper blade'91a The ends of the beam 87 are suspended by link hooks 92, 93 from 'the arms 94, 95 at the rear ends of shafts 96, 97, respectively. The front ends of the shafts 96, 97 are provided `with worm pinions 98 which mesh with worms 99, which in turn are, actuated by hand wheels 100. Thus either or both ends of the .beam 87 maybe manually raised and lowered,'as desired, by actuating the hand`- wheels 100. l

In the machine shown in Figs. 4, and

8 the scraper frame is provided with a lifting or adjusting mechanism, which although .manually controlled (from either seat 27 or 28) is'power operated ,by the engine, as

follows :l The endsof the beam 87 are connected by links 101 and 102 to cranks 103 and 104' on respective shafts 105 .and 106. The shaft 106'hasa worm gear 107, meshing with a worm 108 on a shaft 109. The lower end of the Ashaft 109 has a friction roller 110 which is arran ed `'between to engage either of the discs 3 or 38. The roller is moved into engagement with either of the discs, as desired, by a bell crank member 111 which, in turn, is actuated by a link 112 and an arm 113 of a sleeve 114 which is journaled to the frame B. This sleeve is also provided with arms 115 and 116, the first of which is connected by a rod 117 to a rear (left). foot pedal 118, while the latter is 'connected by a rod 119 to a front (left) foot pedal 120.

Rotatably secured in the sleeve'114 and also journaled to the frame B, as at 121, is

a sha-ft 122 having three crank arms 123,

124 and .125. vThe crank arm 123 is con- 4 nected by a link rod 126 to -a front (right) foot pedal 127, thearm 125 is connected by a link rod 128 to a rear (right) foot pedal 129, and the arm 124 is connected by a link 130 to a bell crank levery131, which controls the 4position of a friction roller' 132, of a shaft 133, with respect to its engagement with either of the two friction discs 134 and 135l on the Ycontinuously rotated shaft 44. The upper end of theshaft 133 drives a worm gear 136 on the shaft 105, to raise and lower the right end of the beam` 87, as may be required.l It will thus bel obvious that the operation of the mechanism for controlling` the vertical position of the right end of the scraperl beam 87, by the action of either pedal 127 or 129, will be substantiall the same as the raising and lowering of t e left end of the beam bythe pedal 12o or 118. L

l The entire scraper fra-me may also be raised and lowered without changing the Working-angle of the blade 91 by Clutch hand levers 137 and 138, -which, by means of .by the scraper orother road working implement. Thus the angle of the scraper blade will be automatically adjustedto correspond to the angle or inclinationof the axle 141, and as the trucky or carriage vD d oes not roll 'over bumps or hollows in the road surface,

as do the traction wheels, its axle will have `a substantially uniform anglel at all times. This mechanism also co-op'erates with but does not in any way interfere with the manual adjusting mechanism for tilting the blade. as may be desired under various cir- Cumstances. The mechanism referred to consists of 'a pair of shafts 142 and 143 having respective cranks 144 and 145 at their rear ends'and keyed worm gears 146 and 147 at their front ends. The cranks 144 and 145 are connected by links 148 and 149 to the axle 141. Trunnioned upon-the shafts 142, 143,'and retained between the gears 146, 147 and bearing members 150,'are a pair of bell crank levers having substantially horizontal arms 151 and 152, connected by links or link hooks 153 and 154 to the Vends of the beam 87. The upstauding or normally vertical ,arms 155 and 156 of these bell crank levers are bifurcated, as shown, and

in themarejournaled shafts 157 and 158, having worms 159 and 160 which mesh with the gea-rs 146 and 147. Bevel pinions 161 or actuated by suitable hand wheels 166 and 167, through the medium of bevel pinions 1634..f It may herebe noted that the front end' of the shaft 163 (andzalso 174) is journaled and supported in a bearing eX- tension 163B of a bracket 163C, and that the rear part of the shaft is journaled and supported in a bearing extension 155A of the member 155. j f

In the operati/on of the mechanism immediately above described, it will be seen-that ywhen the right end (for'instance) of the axle 141 moves upwardly .it will raise' the crank 144 and cause all lthe parts 146, 159, 155, 155A, 157, 161 163 and 1.51 to rotate 0n the respective clutch locks 139 and 140, lock the A I i raise or lowerJthe entire blade or to increase or decrease its inclination, that result may be affected by operating either one or both of the hand wheels 166 or 167.' Thus, for instance, if the wheel 166 is rotated, it will correspondingly opera-te through' the shaft 163 and pinions 161 to rotate the worm 159 and cause it to crawl or move on the rigid gear 146, thus'causing the yoke arms -155 and 151 to turn on the shaft 1 142 and raise the link 153 of the scraper frame bar 87. Asl the shaft 163 is provided withfsuitable universal joints 165it will not interfere or bind when the worm 159, and its bearings, move in an arc over the worm gear 146.

The scraper or surfacing mechanism proper, as shown in Figs. 6. 7,v1() and `11, embodies certain additional features and modifications over that previously described, and will now be set. forth in detail.

The members 84, 87,88, 89, 90 and 91 have been previously mentioned, but instead of the casting 85 there is now substituted a4 casting 168, which is pivotally connected by a yoke 169 to the tractor A, and this yoke has a screw 170, regulated by a hand wheel 171. whereby the front ends of the draw bars 84 may be adjusted vertically, as may be desired.

The lower portion of the casting 168 is provided with two sets of perforat-lons 172 and 173,` which adjustably accommodate the pins 174 and 175 of a yoke 17 6'and a frame 177 lof a scarifier. 'The yoke 176 is rigidly secured to a hollow shaft or pipe 178, by bolts 179, and the shaft in turn is journaled in'the frame 177, so that the line of draft and the rotated position of the shaft 178 may be readily adjusted by replacing the pins 174, 175 to the perforations 172, 173, as may be required by the nature of the work to be done. The scarifier teeth' or implemerits 180 are secured to the pipe 178 by bolts 181, and the'vertical adjustment of the scarifier aswell 4as its horizontal stability is affected by a pair of adjustable bolts 182, secured at their upper ends to the frame bars 84. The teeth 180 consist of wedge shaped castings having renewable triangular edged plates 180a secured to their bottom faces so that the hard surface of the road may be readily plowed up and disintegrated.

A bar 183 is mounted in the vertical i flanges of the draw bars 84 and to it are pivotally connected the front ends of a pair of substantially L-shaped auxiliary draft beams 184, to the'lowe'r ends of which is adjust-ably secured a smoothing board 185. Rearwardlyof the board 185 is a heavy roller 186, which is connected to the beams 184 by suitable means such as links 187; The members `184185 are yieldingly pressed downwardly by springs 188, which are mounted on bolts 189 of the beams and spread the lower ends of the bolts ownwardly away 'from rearwardly extending brackets 190, secured on the transverse beam 87. J f

The main structure and the various modiications as above shown and described illustrate some of the lpractical embodiments of our invention. It is understood, however, that further modifications in the general design and structural-details may be resorted to, provided the same are within the scope of the appended claims. Having now illus- 'it-ratedv and described certain preferred embodiments of the invention, whatwe claim 1s:

1. The combination with a normal trac-l tor having its forecarriage removed, of an auxiliary frame extending forwardly to the front end of the tractor so as to support it, said frame having its rear end extended rearwardly of the tractor, a steering truck at' therear end of the frame, and a road working implement adjustably suspended under the rear portion of the frame and arranged to be drawn by the tractor.

2. The combination with av normal tractor having a main frame, traction wheels and a power member, and having its usual fore carriage removed; of an auxiliary frame extending rearwardly from the tractor and secured to its main frame so as to support it in an operative position when said fore carriage is removed, a steering carriage supporting the rear end of said auxiliary' frame means for steeringv the carriage, and an earth working implement adjustably suspended under the auxiliary frame. X 3. The combination with a normal tractor having rear traction wheels and having its forecarriage removed, of a frame rigidly secured to and extending rearwardly from the unit so as toy support its front end from whence said forecarriage has been removed, means for supporting the rear end of the. frame, an implement arrangedto be drawnbyI the traction unit, and means for adjustably connecting the implement to the frame.

4. The combination with a tractor unit having a main frame and rear drive wheels and having a drivers support, of a second frame secured to and extending rearwardly from the traction unit, anPimplement suspended from and under the frame, and means, operable from the drivers support, for adjusting the implement with respect to the fram los 5. The combination with a vehicle having `front and rear supporting wheels, of a transversely tiltable axle connecting the rear wheels, a transversely tiltable implement arranged forwardly of the rear wheels, andy 6. The combination'witha vehicle having front and rear supporting wheels, of a transversely tiltable axle connecting the rear Wheels, a transversel tiltable implement arranged forwardly o the rear wheels, means connecting the said axle with the implement whereby 'a tilting movement of the former will correspondingly tilt the latter, and manually controlled means for tilting the implement independently of the first mentioned means. f

7. A machine of the character described consisting of a frame, traction means at the forward end of the frame, -a carriage tiltably connected to and supporting the rear end of the frame, an implement arranged under the frame, and connected to the traction means, and means associated with the ca'rriage for controlling the transverse angular -position of the implement.

8. The combination with a tiltable road working implement supported by a frame and adapted to be drawn therewith over the road, of a carriage arranged rearwardly of the implement and tiltably connected tothe frame, and means associated with the carriage for tilting the implement;

9. The combmation with a tiltable road working implement supported by a. vehicle frameand adapted to be drawn therewith over a road, of a carriage arranged .rear- Vwardly ofthe implement and tiltably supporting the. frame, means mounted on the frame and associated withv the carriage for automatically and correspondingly tilting the implement with respect to the carriage, and means for manually controlling the tiltable\position of the implement irrespective of the position of the carriage.

10. The combination with a road machine or the like having a transversely tiltable earth workin blade, of means associated with the bla e, and, engageable with' the earth surface traversed by the blade, to automatically retain the blade in a parallel position with respect to the earth surface 'thus traversed, as the entire machine moves forward, said means including a carriage tiltably supporting the rear end of the machine.

11. The combination of a transversely tiltable earth engaging member adapted to be p drawn over the ground by a tractor unit arranged-in advance thereof, means associated -with the member and engageable with the ground surface rearwardly of the member,

, to constantly retain a predetermined pitch orvtransverse inclination of the member as it travels over the ground, and manually controlled means operable from the tractor unit for adjusting said predetermined pitch. 12. The combination in a machine of the character described,l of a frame, .traction means at the front end of the frame, steering means at the rear end of the frame and including a transverse tiltable axle, an implcment adjustably suspended under the frame and adapted to be drawn therewith by the tract-ion means, and an implement adjusting mechanism connected with the said axle of the steering means.

13. The combination with-a 'vehicle having a frame, of a carriage tiltably secured to and supporting the rear end of the frame, a fore carriage rigidly secured to the front end ofthe frame, an implement adjustably secured under the frame, and an adjusting mechanism controlled by therst mentioned carriage for adjusting the implement.

v14. The combination in a machine of the' character described, of a traction unit, a frame extending rearwardly therefrom and secured in rigid alignment therewith, a steering carriage supportingthe rear end of the frame and adapted to be controlled from the traction unit, an implement adjustably suspended under the frame to be drawn therewith by the traction unit, and an adjusting mechanism controlled fromv the traction unit foradjusting the implement.

ing carriage to the tractor whereby the operator of the tractor may steer said carriage.

16. The combination with a tractor having traction wheels supporting its rear endv tending rearwardly therefrom so as to sup-V 'f port and counterbalance the front end of the tractor,xsteerin0v means for supporting the rear end of the. adjustably arranged under the frame and arran ed to be drawn by the tractor.

1%. The combination with a tractor having traction wheels supportlng .its rear end, an auxiliary frame secured longitudinally of the tractor and extending rearwardly therefrom so as to support and counterbalance the front end of the tractor, steering means for supporting the rear end of the frame, a working unit arranged rearwardly of the tractor and connected with the draw bar ame, and an implement thereof, and means for vertically adjusting either side of the working unit with respectl to the frame.

18. A machine of the character described consisting in combination, of a tractor havinga main frame and supported atits rear on traction wheels, a second frame extending .rearwardly from the tractor and having a wheeled support at its rear end, means for supporting the front end of the tractor from the second frame, an earth working implement drawn by the tractor and adjustably associated with the second frame, and means for steering the machine.

19. The combination with a normal tractor `having rear traction wheels and having its normal steering carriage removed, of a frame secured to the tractor so as to support its front end from'whence the steering carriage has been removed, a steering carriage supporting the rear end of the frame, an implement adjustably associated with. the frame and adapted to be drawn therewith by the tractor, and means for operatively connecting the normal steering mechanism of y the tractor with said steering carriage.

earth working implement, and steering theV machine. l

21. The' combination inv a self-propelled` road machine, of a traction unit having laterally spaced traction wheels, a frame extending rearwardly from the `traction unit and having its front end carried.thereby,

. supporting means for the rear yend of the frame, said supporting means being transversely -tiltable with respect to the traction wheels, a grader blade arranged under the frame to be drawnv therewith and associated with the supporting means so as to be translversely tiltable therewith and with respect to the traction wheels, means for steering the machine, and means for manually adjusting the transverse inclination of the grader 22. In. a self propelled road machine, a frame, a traction unit supporting the front end of the frame, a carriage for supporting the rear end of the frame, said carriage being transversely tiltable with respect to the traction unit, a second frame arranged below the main frame and rearwardly of the traction unit, a transversely arranged cutting 1 blade carried by the second frame, a drivers support on the machine, and controls extending tothe drivers support for steering the ymachine and for adjusting the transverse inclination of the cuttingv blade.

23. In a 'self-propelled road machine, 'a frame, a traction unit supporting the front end 'of the'frame, a carriage for supporting the rear end of the frame, said carriage being transversely tiltable with respect to the i traction unit, a second frame'arranged below the main frame and rearwardly of the traction unit, a cuttingv blade adjustably carried by the second frame, and means for vertically adjusting either or both ends of the cutting blade. y

24. In a self-propelled road machine, the combination including a main frame, a traction unit supporting the front end of the `frame, a steering carriage comprising a pair of laterally spaced wheels for supporting the r'an ed below the main frame and rearwardly o the traction unit, said cutting blade being associated with the steering carriage so as to be transversely tiltable therewith with respect to the traction unit. v .25. In-a self-propelled road machine, the

combination including a main frame, a trac-` tion unit supporting the front endof the frame, a carriage for supporting the rear end of the frame and being transversely tiltable with respect to the traction unit,a second frame suspended underthe main frame andI rearwardly of the traction unit so as to be drawn thereby, a cutting blade carried by the second frame, and means for manually adjusting the transverse inclination of the cutting blade.

26. In a self-propelled road machine, a traction unit, av frame extending rearwardly from the`traction unit and havin its front end carried thereby, a cutting lade suspended transversely below the frame and ,rearwardly of the traction unit so as to be drawn together with the' frame thereby, a

8.5 vrear -end of the frame, a cutting blade arcarriage for supporting the rear end ofthe l frame and adapted to travel on the earth Asurface traversed by the cutting blade, and

means controlled by the carriage to automatically retain the cutting edge of they blade in a parallel position with respect to the earth surface thus traversed.

27. In a self-propelled road machine, a

traction unit, a :frame extending rearwardly from the traction unit and having its front end carried thereby, a cutting lade suspended transversely below the frame and rearwardly of the traction unit so as to be drawn thereby, a carriage for supporting the rear end of, the frame and adapted-to travel on the earth surface traversed by the cutting blade, means controlled bythe carwriage to automatically retain the cutting edge of the blade in a parallel osition with respect to theearth traversed yy the blade,

and means for manually adjusting the tra-nsverse inclination of the blade.`

28. In a self-propelled road machine, the combination includingfa traction unit'having a power element carried thereon and laterally spaced traction members driven thereby by the power element, a frame egitending rearwardly of the tractionunit and having its fore end carried thereby, a carriage supporting the rea-r end of the frame, said carriage being transversely tiltable with respect to the traction unit, a second frame suspended below the rst mentioned frame,

` tures.

'and adapted to be drawn therewith behind station on the machine, controls/extending to said station for adjusting the inclination of the cutting edge of the grader blade, and means for steering the machine.

In testimony whereof we affix our signa- I ANDREN G. RONNING. ADOLPH RONNING.

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