US2247464A - Road grader - Google Patents

Description

July 194% F. E.' ARNDT 2,247,464

y ROAD GRADER u v Filed Feb. 2, 1953 5 sheets-sheet 1 July l, 1941. F E. ARNDT 2241464 ROAD GRADER Filed Feb. 2, 1953 5 sheets-sheet 2 e7 89 A /a/ F. E. ARNDT July l, 1m.,

ROAD GRADER Filed Feb. 2, 1935 5 Sheets-Sheet 3 F. E. ARN DT july l, 1941'.

` ROAD GRADER F. E. ARNDT ROAD GRADER July n, w41.

, 1935 5 Sheets-Sheet 5 Filed Feb. 2

Patented July l, 1941 ROAD GRADER Franklin E. Arndt, Galion, Ohio, assigner to The Galion Iron Works and Manufacturing Company, a corporation of Ohio Application February 2, 1933, Serial No. 654,901

20 Claims.

My invention relates to road building apparatus and one of its objects is the provision of improved and efficient fluid-pressure motor mechanism for effecting various adjustments in a road grading machine.

Ano'ther object of the invention is the provision of improved and emcient self-contained power-operated mechanism for moving a mold v board in a-road grading machine from a hori- Zontal position :to a :high lift or bank sloping position.

A further object of the invention is the provision of improved adjustable connections between the rear end of lthe drawbar and the rear portion of the supporting framework in a road grading machine to enable the extent of lateral shift of the mold board to be increased.

Another object of the invention is the provision of improved connecting mechanism in a road grading machine between the drawbar and the supporting framework to strengthen the support of the mold board when operating in bank sloping position.

Another object of the invention is the provision of fluid-pressure operated mechanism for shifting a mold board laterally relatively to the supporting framework in a road grading machine.

A further object of the invention is the provision of improved fluid-pressure steering mechanism for a vehicle, particularly in a road grading machine.

Another object of the invention is the provision of improved sup-porting means for flexible huid-pressure hose adjacent the steering post of 1" Another object of the invention is the provision of open framework combined with supporting and adjusting mechanism for a mold board in a road grading machine to enable the operator rto view 'at all times the action of the vmold board `on the road surface.

A further object of the invention is the pro- V vision of meansv for varying the elevation of the front end of the drawbar in a road grading machine relative to the framework thereof to assist in adjusting the elevation of the mold board when in horizontal position and to afford ample clearance between the mold bpard and the framework when the mold board is ,moved to a bank sloping position.

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 elevation of a road grading machine embodying my improvements;

Fig, 2 is a `plan view of the structure shown in Fig. 1;

Fig. 2a is a perspective view of the latch mechanism embodied in the connections between the rear` end of the drawbar and the rear portion of the machine frame;

Fig. 3 is a rear elevation of the machine shown in Fig. 1;

Fig. 4 is an elevational View, partly in section, taken on the line 4 4 of Fig. 1 looking in the direction of the arrows;

Fig, 5 is a plan View of the machine shown in Fig. 1 with the mold; board shifted to its maximum extent from one side of the machine;

Fig. 6 is a diagrammatic front elevational View of the mold board supporting mechanism shown in plan in Fig. 5;

Fig. 7 is a plan view of the road grading miachine with the mold board adjusted to its bank sloping position;

Fig. 8 is a diagrammatic front elevational view of the supporting mechanism for the mold board when in bank sloping position;

Fig. 9 is a diagrammatic view of the pump and hydraulic. motors and the piping therefor; and

Fig. 10 is a view representing the internal combustion engine connected to a hydraulic pump.

The machine shown in Figs. 1 and 2 comprises the vehicle frame I I mounted on the front wheels I2, I2 and rear wheels I3, I3. The frame II comprises longitudinal spaced-apart beams I4, It which are rigidly connected by the tubular cross-pieces I5, I6, Il and I8.

As shown in Fig. 4 the forward ends o f the beams I4, I4 are connected by a U-shaped yoke I9 which rests upon a supporting frame *20 having depending channel irons 2|, 2I secured at their lower ends to the axle-tree 22 on the ends of which are pivoted ai; 23, 23 the axles for the front wheels I2, I2. These axles are provided with vertical arms 24, I2li to the upper ends of ser 2s at s4', ss'.

which is pivoted the cross-piece 25. Between one of the channel irons 2| and one of the arms 24 is pivotally connected a hydraulic motor comprising a cylinder 26 and a piston rod 21. The cylinder 26 is pivoted at 26 to one of the channel irons 2l and the piston rod 21 is pivoted at 28 to the remote vertical arm 24. As hereinafter explained, the hydraulic motor comprising the cylinder 26 is double acting in that the liquid flows into and out of the cylinder on both sides of the piston therein and therefore when the leaning of the wheels I2 is adjusted, they may be locked in adjusted position by closing the Valve controlling the flow of the liquid in the cylinder 26. v

Figs. 1 and 2 illustrate a pull type grader having a vehicle tongue 29 secured at 39 to the vertical post 3|, the upper end of which is journaled at 32 to the frame 29 and the lower end of which is journaled at 33 to the front axle-tree 22.

A cross-piece 34 secured to the tongue 29, as shown in Fig. 2, provides at its ends pivotal supports at 35, 36 for the cylinders 31V, 38 of hydraulic motors comprising piston rods 31', 38',

the rear ends of which are pivoted at 49, 4I to the front aXle-tree22. While in some instances one double acting hydraulic motor comprising a cylinder, a piston,'and'a piston rod may be employed, I prefer to use two hydraulic motors symmetrically arranged as shown in Fig. 2.

As shown in Figs. 1 and 2, a cross-plate 42 is secured to the upper sides of the forward ends of the side beams I4, I 4 and secured to this plate 42 and depending therefrom is a vertical fixed bearing rod 43, the lower end of which'is provided with a retaining cap 44 as shown in Fig. 4. When the hydraulic steeringmechanism is operated the frame 29 turns on a vertical axis at the center of the bearing 43.

Secured to the bottom of the plate 42 concentric with the bearing rod 43 is a gear housing 44. When the rcrank 45 is operated, worm gearing on shaft 45 and in the housing 44 turns the screw 46 in the nut 41 to which is pivoted at 48, 48

the yoke 49 which in turn is journaled at 58 to the front end of the drawbar 5I; It will thus be seen' that by turning thexcrank 45 the front end of the drawbar may be elevated or lowered relative to the frontv end of the main frame 4I I;

Secured to the top of the plate 42 is a socket 52 in which is mounted a vertical post 53` which may be held rigidly in vertical position by lateral braces one of which is shown at 54 in Fig. 1 secured toone of the beams I4.

To the top of the post 53 is swivelled at 55 a connecting member 56 the forward end of which is pivoted at 51 to a supporting plate 58. The forward end of the plate 58 is secured by means 4of the loop 59 to a spring 68 which is connected at its front end to the tongue 29, Clips 6I, 6I

- are relied on to secure the four flexible conduits 62, 63 and 64, 65 to the plate 58. The conduits 62, 63 are-connected to the ends of the cylinders 31 and 38 at 62', 62 and-63', 63. The conduits 64 and 65 are connected to the ends of the cylin- Mounted on a cross-piece 66 on the forward portion of the frame II are two valves 61 vand 68, the valve 61 controlling the ow of liquid in the conduits 64 and 65 and the valve 68 controlling the flow of Vliquid in the conduits'62 and 63, The valves 61 and 68 are connectedrby means `of universalY joints 69 and 1I) to longitu- CII portion of the frame where they are connected by means of universal joints one of which is shown at 13 in Fig. 1, to operating cranks each movable along a gauge secured to the framework 14 at the operators platform 15 The crank 16 may be connected to the rod 12 for actuating the Valve 68 which controls the steering of the machine. As shown in Fig.V 3 thecrank 16 is associated with the gauge 11,'the ends of which may be provided with limit stops 18, 18 which indicate wide open positions of the valve 68. In a similar manner the crank 19 may be connected to the rod 1I for actuating the Valve 61 to control the leaning of `the front wheels I2. The crank 19 may be associated with the gauge 88 which is provided with limit stops 8|, 8| to indicate the wide-open positions of the Valve 61.

It should be particularly understood that the leaning of the front wheels by means of the hydraulic motor mechanism shown in Fig. 4 may be taken advantage of to cooperate with the steering of the machine by means ofthe front wheels, to counteract the tendencyof the, mold-board during operation along the road surface'to shift the front end of the machine sidewise,` For instance, if the mold-board is in the position-shown in plan in Fig. 2, the tendency will be during operation, for the front endof Vthe Vmachine to be shifted laterally to that side where thefrontend of the mold-board is located. By leaning the tops of the front wheels toward the4 right as viewed in Fig. 4, the lower` edges of the `rims of the front wheels will be in positions `to digjor cut into the roadwayAand Vcounteract the v-tendencyfof the mold-board to Ashift thefrontend of the machine sidewisef- Furthermore, by means of the hydraulic motors 31,7387 thefront Wheels may be steered toward lthe left as viewed by the operator at the rear end-ofthe machine and thus assist the leaning of the front wheels in counteracting the tendencylof -themold-board to. shift the front end of the machine sidewise. Moreover, the operator at his single station at the rear end of the machine has under his direct observation, the operation of the .mold-board and the steering of the machine and the VVarious adjustments may be made by theoperator so asto effect locking of the Various parts in adjusted positions including the front wheels, thereby greatly lessening the tendency of the front wheels as a unit to swerve sidewiseY onA the .Vertical axis 32, the hydraulic motors 31, 38 being inlveryecient positions to resist swerving of theffront Wheel unit on ,the axis32evenwhen one wheel or the otherrides over` an obstructionor irregularity in the roadway. l, v l l,

Secured rigidly to the rear ends ,of `thelongitudinal beams I4, is a cross supporting'structure 82 comprising angle irons 83, 83 as=shown in Fig. 3 and the cross-piece 84 shown in Fig. 2.` VGuides are provided at.85, 86 for the transversevmembers 81, 81 of the rear wheel supporting frame, The axles88, 88 for the rear wheels I3,v I3 are pivoted at 89, 89 to the en dsofvthe frame 81. Secured to the rear wheel axlesiare vertical crank arms 98, 99 the upper. end Ogf Whichv are pivotedat 9|, 9| to the'cross-piece 92. A A

A vertical bracket iplate 93 is, secured tothe frame 81 and to its..1.lpl0er,end at 94 is pivoted a cylinder 95 of a hydraulic motor comprising a piston rod 96 the outer end of Which is pivoted at 9| to the upperend of `the crank arm 96 at the dinal rods 1I .and.12 which extend'toglthe rear 75 left-hand side of the Vmachine as Viewed from the rear (Fig, 3). Theliydraulic motor comprising the cylinder 951is doubleA acting'in thatthe the frame 81.

liquid flows to and from the cylinder 95 on both sides of the piston therein and the controlling valve is such that when it is closed the crank arms 90, 90 will be locked in adjusted positions. The leaning of the rear wheels may therefore be adjusted by means of the hydraulic motor comprising the cylinder 95 and locked in adjusted position.

In order to shift the rear end of the frame II relatively to the rear wheels, a hydraulic motor comprising a cylinder 91 is pivoted at 98 to a bracket 99 which is secured to the frame 81. The piston rod which is `connected to the piston that moves in the cylinder 91, is pivoted at its outer end at IOI to a gear wheel |02 meshing with the rack bars |03 and |04. The upper rack bar |03 is secured to the machine frame and the lower rack bar |04 is Vsecured to It can readily be seen that when the piston in the cylinder 91 is locked, the rack bars |03 and |04 are relatively stationary and therefore the gearwheel |02 is locked against rotation. The hydraulic motor comprising the cylinder 91 is double acting and controlledjby valve mechanism so that when the piston rod |00 is moved relatively to the cylinder 91, the rear end of the main frame will be shifted laterally relatively to the rear Wheels |3, by the gear |02 rolling on the rack |04 and driving the rack I 03. When the piston in the cylinder 91 is locked, the pivotal axis at |0| will be stationary relative to the cylinder 91. The rack bars |03 and |04 will not interfere at anytime with the operation of the rear wheel leaning mechanism because when the vertical arms 9|) are rccked in either direction the racks |03 and |04 will remain stationary.

Referring now to the road working implement comprising a mold board or scrapper |05 and the structure for supporting the same, it will be seen that the drawbar 5| comprises spacedapart members |06 and |01 which diverge rearwardly andhave secured to the rear portions thereof a supporting circular guide |08 for supporting and guiding the circle frame |09 on which the mold board |05 is mounted. By

means of gearing I|0 connected by shafts and universal joints I I2, to the wheel I I3 at the operators station, the circle |09 and the mold board |05 may be adjusted angularly relative to the path of travel of the road grading machine,

By` means of the pull handle `||4 connected by the rod I|5 to the latch mechanism ||6, the

4tion, which apparatus is self-contained vand power-operated so that the actual work necessary to move the mold board to the desired adjusted positions is done by power-operated mechanism under thecontrol of the operator.

It should be understood that the circular guide frame |08 is rigidly secured to the longitudinal members |06 and |01 of the drawbar 5| and therefore this circular frame |08 moves bodily with the drawbar and the mold board" `member |6| thereof.

ceiving the latch mechanism |63. circular frame comprising the cross-piece |60 |05 moves bodily with the guide frame |08 and the drawbar 5|.

To the diametrically opposite sides of the circular guide frame |08 are connected by means of universal joints II1 and ||8 the lower ends `oi extensible hanger rods ||9 and |20.

" length of the hanger has been adjusted. While in Fig. 1 I have made provision for two different lengths of the hanger I9 it should be understood that there may be more than two holes |23 if desired.

The upper ends of the hangers ||9 and |20 are connected by means of the universal joints |24 and |25 to the crank arms |26 and |21 which extend laterally from the longitudinal rockshaits |28 and |29. The rockshafts are mounted in suitable bearings |30, |3| and |32, |33 on the tops of the beams I4, I4 and spaced above the same a suflcient distance to afford ample clearance between the cranks |26 and |21 and the main frame II when such cranks are swung downwardly.

To the rear ends of the rockshafts |28 and |29 are connected the laterally extending crank arms |34', |34 which are connected at their outer ends by means of universal joints |35, |36 to the upper ends of the piston rods |31, |38 which extend downwardly into the cylinders |39 and |40 of hydraulic motors mounted on opposite sides of the rear portion of the frame II as shown in Fig. 2. The lower ends of the cylinders |39 and |40 are pivoted at |4I, |42 to brackets |43 depending from the beams I4.

The hydraulic motors comprising the cylinders |39 and |40 are preferably double acting and provided with valves for controlling the flow of liquid to and from the cylinders on opposite sides of the pistons therein. Consequently when the mold board has been adjusted it may be locked in adjusted position to prevent undue vibration thereof during road working or bank cutting operations.

The mold board may be shifted laterally relatively to the frame II by means of the hydraulic motor comprising the cylinder |44 and the connections between the same and the rear end of the drawbar 5|. The upper end of the cylinder |44 is pivoted at |45 to a bracket |46 mounted on the cross-tube |1 as shown in Figs. 1 and 2. IIhe piston rod |41 is connected to a rack bar |41' which is guided by a roller |48 and which meshes with the pinion |49 secured to a shaft journaledin the cross-piece |50. Thelower end of this shaft is secured to a gear |5 which meshes with the transverse rack bar |52. The rack bar |52 is supported by and guided along the transverse rail |52 secured to the lower sides of the beams I4 as shown in Fig. l.

`Between a pair of lugs |53 is pivoted at |54 on a horizontal axis, a clevis |55 and the latter is pivoted on an upright axis to a rod |56 which is adapted to slide in a longitudintl guide |51 onv the bottom of the plate |58. The plate |58 is pivoted at |59 to the cross-piece |60 of a semicircular frame, at the center of the arcuate This arcuate member is providedwith four or more notches |62 for re- The semii in Fig. 2a. Y

:andthe-'arcuate member ISI, is pivoted at 1164,

|55 to the rear ends of the members |56 andi |01 -of the drawbar 5|.

The latch mechanism |63 is shown in perspective in Fig. 2a. On top of the rear end of the `5 plate |58 is secured a guide framel |66 comprising fixed guide blocks |81, |68 along which is The handle is frame |85, and a collar |13 on theouter end of therod holds the spring |1| in the position shown '.It yshould be understood' that no labor :need be lexercised bythe operatorpin shifting the` moldfboard laterally. 'Ihe latch |69 may be easily released manually by pulling the handle Y|111V rearl wardly. Then by operating the hydraulic motor comprising the cylinder |44, the latch mechanism may be moved transversely of the frame of"the,125n y rEach .motor r1s, independently. controlled so that v thecrank yarm |26jmay be moved through a small machine until the latch |69 is snapped-into'the next notch by the spring I'H. By again releasing the latch the rack bar |52 may beshifted by hydraulic lpower until the latch snaps into the lastnotch, whereupon the rear end ofY the draw-f 30.

barhwill be rigidly connected to the rack bar |52. Then upon reversing the hydraulic motor comprising the cylinder i 44, the latch mechanism will effect movement .of the mold board laterally to its maximum extent when the piston in the cylinder |44 reaches the limit of its stroke.

The hydraulic motor |44 being double acting, the shifting gearing will be locked in adjusted position when the valve connected to the cylinder |44 is closed. The connections between the rear end' 40V of the drawbar and the hydraulic motor |44 are such asto securely hold the mold board in adjusted lateral position. It should be understood that the mold board by reason of the plurality of the notches |82 may be adjusted to a correspond-i 4.3`

l o n suitable supporting framework at the rear end ing plurality of lateral positions on either side of the frame of the machine.

Fig. 5 is a plan view of the road grader with the mold board adjusted to one of its extreme lateral positions While horizontal, as shown in Fig. 6,1

the latter being a diagrammatic front elevational l view to show the relative positions of the front and rear wheels when adjusted as shown in Fig. VV5 and the relative positions of the hangers and the front crank arms |26 and |21. yAs shown in"55 Fig. 6 kthe tubular member |14 may be longer than the tubular member |15 so that the hangers H3. and |25 may be extended to different 'lengths to facilitate lateral shifting of the mold .i lugs |53 and |53" secured to the. rack bar |52` n when the :mold

near the ends of the latter. board is about to be shifted to the right-hand sidelof the machine as shown in Fig. 5 the slide rod`|56 is connected -to the lugs |53, Whereas if the mold board isabout to be shifted to the left, 70

. hand side of the machine, the slide rod |56 is connected to the lugs |53. This adjustment may easily be made by releasing the latch |63 and swinging the plate |58 on its pivot |59, it .I being understoodthat all of the labor necessary; 75.

l lever |82 (Fig. 3). .|84 are similarly connected to valves 2||, 2|2

tonshiit-themo1d; board .1 laterally is performed bythe hydraulic motor |44.

inasmuch as itis desirable to use the shorter tubesjmay behdetachable 'at the universal joints |24 and |25 and therefore are interchangeable.

Foruinrstance, the tubes |14 and |15 may be eX- changed whenrthc mold board is to be moved to the left-handside of the machine and then up tQxflUlglQmflg .Positionhg- Aftershiftingjhe `mold board to its extreme lateralposition such as that shown in Fig. 5, the

1 atcjlkv |83 is retained in position and the hydraulicmotor |44 is locked. By releasing the pins in thetubes .|314 and |15, the crank arms |26 and |2l1may beadjuste'd by the hydraulic motors |39 .andl'|40.unti1.the" hangers I l and |28 are adjusted to. they desired lengths and the pins. |23 re'lfinserted Vto hold the hangers at the adjusted lengths.-` 'Ihen by operating the motors |39 and Y|4|l .in opposite directions the crank arms |25 and |21 may each be rotated in an anti-clockwise direction` as rvievved from the operators station.

angle fromthe position shown in Fig. 6 to the po- .sition shown in Fig. 8 and the crank arm |21 the connections `between the rear end of the drawbar and the machine or vehicle frame, to

.hold the mold board in rigid adjusted position relative to the machine frame. This position is h preferably such as to direct the materialV that is cut fromV the bank, tothe space between the paths of travel of the rear Wheels, as shown in Fig. 8. However, the mold board may be shifted to a still higherkposition to direct the material outside of the path of the adjacent rear wheel.

The internallcombustion engine |18 4and the pump Y|11 to which it is connected, are mounted of the beams I4, |4, as shown in Figs. 1 and 3. The fluid-'pressure medium such as oil is drawn from the supply tankV |13 by the pump |11 and forced through the various pipes or conduits shown in Fig. 9. The valves for the respective Y hydraulic motors are each located adjacent the same andoperated by connections extending to operating levers Within reach of the operator on the platform 15 at the rear end of the machine.

. The rear leaning Wheel motor 85 is provided with a valve |19 operable by the connections |88 to the actuating lever |8| (Fig. 1). In a similar manner the rear shifting motor 91 may be controlled by a valve-283 connected to the operating The operating levers |83 and whichv control the mold board tilting motors |39 and |48. Y`By means. of the lever |85 and the connections between the same and the valve |85,

the drawbar shifting motor |44 may be con- 'lOllfL Y -f The operation of the various adjustments by means of'thehydraulic motors may best be und'erstood by referring to the piping diagram in Fig; 9. When the vehicle tongue 29 is in its fcent'ral position sho-wn in Fig. 2 and it is desiredv to turn the front axle-tree 22, the motors and 38 are operated in opposite directions. By means of ,the lever 16 (Fig. 3) the valve 68 may be moved to its full line position shown in Fig. 9.

The engine |16 is intended to be operated to continuously drive the pump |11. Liquid will be Withdrawn from the supply tank |18 through the suction pipe |81 by the pump |11, and forced by the latter through the conduits |88, |89, |90, through the valve 88 into the pipe 62 and thence into the steering cylinder 31 back of the piston therein, and through the pipe |9| into the steering cylinder 38 ahead of the piston therein. When the pistons in the cylinders 31 and 38 move in opposite directions, liquid Will be forced therefrom through the conduits |92 and 63 and thence through the valve 68 into the pipes |93, |94, back to the supply tank |18. When the valve 68 is closed the pistons in the cylinders 31 and 3B Will be locked against movement in either direction. When the valve 68 is moved to its dotted line position the ovv to and fromY the cylinders 31 and 38 will be reversed and consequently the iront axle-tree 22 Will be vturned in the opposite direction.

By means: of the lever 19 (Fig. 3) the valve 61 may be opened to the full line position shown in Fig. 9, whereupon liquid will be' forced from the pipe |90 through the valve 61 into the pipe 64 and thence into the front wheel leaning cylinder 26 on that side of the piston therein to Which the piston rod 21 is connected. The piston will move to draw inwardly the piston rod and the liq'uid Will be forced out of the rear end of the cylinder 26 into the pipe 65 and through the valve 61 into the pipe |91 and thence through the pipes |93 and |94 back to the tank |18. By moving the valve 61 to its dotted line position the operation of the motor 26 may be reversed. By closing the valve 61 `the piston rod 21 will be locked in adjusted position `against movement in either direction. By means of the motor 26 the leaning of the front Wheels |2 may be adjusted and locked in adjusted position.

The leaning of the rear Wheels I3 is adjusted by means of the motor 95 which is controlled by the valve |19 to which the lever |8| (Figs. 1 and 3) is connected. When the valve |19 is in its full line position as shown in Fig. 9 liquid will be forced from the pump through the pipe |98 and valve |19 into the pipe |99 back o-f the piston in the cylinder 95. At the same time the liquid flows from the front end of the cylinder 95 through the pipe 200, valve 19 and pipes 20| and 202, back to the tank |18.

The motor 91 for shifting the rear end of the machine frame relatively to the rear Wheels, is controlled by `the valve 203 to which the lever |82 is connected. When the valve 203 is in its full line position as shown in Fig. 9 liquid Will be forced through the valve into the pipe 204 and the cylinder 91, back of the piston therein. At the same time liquid ovvs from the cylinder into the pipe 205, valve 203 and pipes 206 and 202, back to the tank |18. Both of the valves |19 and 203 may be moved to their respective dotted line positions to reverse the motors controlled thereby and each motor may be locked in adjusted position, by closing its controlling valve.

The mold board shifting motor |44 is controlled by the valve |86 to which the actuating lever |85 (Fig. l) is connected. is in its full line position liquid will be forced from the pipe |90 into the pipe 201, the valve |86 and the pipe 208, into the cylinder |44, back uid will be forced from the other end Of the Cyl- When this valve inder |44 into the pipe 209, through the valve |86 into the pipe 2| 0, and thence back to the tank |18.

The lifting hangers are operated by the motors |39 and |40 to which are connected the controlling valves 2|| and 2|2 respectively actuated by the levers |83 and |84. When the valve 2|| is in its full line position liquid will be forced from the pipe |98 into the pipe 2|3 and through the valve 2|| into the pipe 2|4 and thence into the cylinder |39 ahead of the piston therein. At the same time liquid will be forced out of the rear end of the cylinder |39 into the pipe 2|5 and through the valve 2|| into the pipe 2|6 back to the tank l'|8.`

In a similar manner When the valve 2|2 is in its full line position liquid will now from the pipe |98 into the pipe 2|1 and through the valve 2|2 into the pipe 2|8, and into the cylinder |40 back of the piston therein. At the same time the liquid ovvs from the piston |40 into the pipe 2|9 and through the valve 2|2 into the pipe 220 Which is connected to the suction pipe' |31. When the valves 2 |I and 2|2 are moved to their dotted line positions the motors |39 and |40 may be reversed and when these valves are closed both motors are locked.

It should be particularly noted that the supply side of the pump |11 is connected directly to each of the hydraulic motors. With respect to the pump |11 the motors 26, 95, 91, |39, |40 and |44 are connected in parallel to each other. The motors 31 and 38 considered as a pair or group are also connected across' the Ipump |11 in parallel With the other motors but the pistons of the motors 31 and 38 valways operate in reverse directions so as vto properly effect steering as indicated in Figs.` 2, 5 and '1.

A pipe 22| connects the pipe 220 to the suction pipe |81. The pump |11 may therefore draw liquid from the return flow pipe 202 or from both return pipe 202 and the tank |18. It is desirable to keepall of the pipes completely lled vvithv liquid at all times and the pipes are therefore preferably so` arranged `that there Will be no drainage by gravity into the tank |18 from any of the return pipes.

Thecapacity of the pump |11 is preferably such as to enable the operator to effect the operation of a plurality motors at theY same time.

For instance, he may control the leaning of thel front and rear wheels at the same time by means of the motors 26 and 95. Furthermore, he may in adjusting the mold board to a high lift or `bank cutting lposition, operate the motors |39,

direction of the arrow 224 to prevent stalling of ,any valve is opened there will be an immediate response in the operation of the motor to which it is connected, the controlling valves being adjacent to the motors, as shown in Figs'. l and 2.

`When the mold board is operating in bank cutting position there is a tendency for themold board when it meets with an obstruction or unusually hard material to move outwardly away from the machine frame while at the same time it is being thrust rearwardly. 'Ihe tubular guide |51 `therefore tends to slide off the slide rod |56. When the lugs |53 are midway between the ends of the raclk bar l 52, as shown in Fig. 2, the latch may vhave to be placed in the last notch |52, whereas when the lugs 53 and |53 are located near the ends of the rack `bar |52, the latch |63 may be located in a notch |52 nearer the center line of the drawbar It will thus be seen that the angle between the center line of the drawbarV extending through the pivot |59 and the center line of the plate |53 extending through the same center, may be made greater when the end lugs |53 and |53" are used, and consequently for a given high lift position of the mold board harder work may be performed in bank sloping position while maintaining all of the parts of the apparatus properly connected and without subjecting them to undue strain.

While I have shown a p-ull type grader, it should be understood that my improvements are also applicable to a road grader of the self-propelled type embodying an internal combustion engine as the power plant connected to the :rear traction wheels.

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

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

1'.Y In a road grader, the combination with a wheel supported frame, of spaced-apart longitudinal rock shafts, a drawbar flexibly connected at its forward end to said frame, a road-working implement carried by said drawbar, radial crank armsextending laterally from said rock shafts, spaced-apart hangers pivotally connected at their ends to said crank arms and said drawbar, means between said frame and said drawbar for shifting the road-working implementlaterally relatively to said frame, spacedapart hydraulic motors pivotally connected at their lower'ends to said frame, operating connections between the upper ends of said hydraulic motors and said rock shafts, and means for effecting operation of said hydraulic motors to actuate thehangers for co-operation with said shifting means to adjust the position of the road-working implement relative to the frame and the road surface.

2. In a road grader, the combination with a wheel supported frame, of longitudinal 'rock shafts journaled to said frame to occupy spacedapart positions, crank arms extending radially and laterally from the front ends of said rock shafts, a road-working implement, a drawbar flexibly connected at its forward end to said frame vand carrying said road-working implelment, spaced-apart upright hangers pivotally connected at their upper ends to said cran'k arms and pivotally connected at their lower endsto said drawbar, two hydraulic motors one connected between the frame and one of said rock shafts and the other connected between said frame and' the other rock shaft, and means for controlling' the operation of 'said hydraulic motorsto operatesaid hangers individually to elect adjustment of the road-working implement and lock the same in adjusted position.

3. In a road grader, the combination with a Wheel supported frame, of longitudinal rock shafts journaled to the sides of said frame and having radial arms extending laterally from the ends thereof, a road-working implement, extensible hangers connected by universal joints at their ends to the forward crank arms and to said road-working implement,V separate hydraiilic motors connected at their upper ends by universal joints to the rear crank arms and connected at their lower ends by pivots to said frame, and means for effecting the operation of said hydraulic :motors individually and the locking thereof in adjusted positions.

4. In a road grader, the combination/with a wheel supported frame, of a drawbar having its front end pivotally connected to said frame, a road-working implement carried by said drawbar, and means comprising spaced apart rack bars connected' by a gear for shifting laterally the rear end of the frame together with said road working implement relatively to the rear wheels of the machine.

5. A road working machine comprising the combination with a supporting frame, of a roadworking implement, a drawbar pivotally connected at its forward end to said frame, a hydraulic motor mounted on said frame longitudinally thereof and comprising a reciprocating piston, and mechanism connected between said motor and the rear end of said drawbar to enable rectilinear movement of said piston to effect shifting of said rear end laterally and thereby move the road-working implement laterally of said frame.

6. A road working machine comprising a supporting frame having spaced-apart longitudinal beams connected by a tubular cross-brace, of a drawbar p-ivotally connected at its front end to said frame, a road-working implement carriedY by said drawbar, a transverse rack-bar connected to the rear end of said drawbar and mounted on said frame to slide laterally relatively thereto, a hydraulic motor comprising a piston in a cylinder pivotally connected at. one end to said tubular cross-brace, a rack bar connected to said piston to reciprocate bodily therewith at right angles to said first-named rackbar, and gearing between said reciprocating! rack-bar and said transverse rack bar to effect lateral shifting of the road-working implement.

'7. In a road working machine, the combination with a wheel supported frame, of a drawbar pivotally connected at its forward end to said frame, a road-working implement carried by said drawbar, .a transverse rack ,bar connected to the rear end of said drawbar and mounted on, said frame to move laterally thereof, and means comprising an additional rack bar connected to said transverse rack bar to shift the same together with the rear end of said drawbar laterally of said frame and thereby secure lateral adjustment of said road-working implement relative to said frame. l

8. A road grading machine `comprising a vehicle frame, a drawbar pivotally connected at its front end to said vehicle, a road-working implement carried by said drawbar, a rack bar, guides for supporting said rack bar for sliding movement transversely of said vehicle frame, mechanism comprising another rack bar extending longitudinally of said frame and connected t0 Said transverse rack bar to effect shifting',v

thereof in'said. guides and relatively .to said frame, and a connection between said transverse rack |bar and the rear end of said drawbar to transmit movement of said rack bar to said roadwonking implement to eect adjustment of th latter relative to said frame. i

9. A road working machine. comprising the combination with a vframe, of arroad-working implement mounted on said frame, a laterally shifting -connection between the frame and said road-Working implement and comprising gear-` ing, and a `hydraulic. reciprocating motor mounted on said frarne` and connectedto said gearing to actuate `the same and thereby effect lateral shifting of the road-working implement combination with a vehicle `having va supporting frame, of a road-working implementcarried by said frame for adjustment laterally of the ve-` hicle, and means comprisinga reciprocating hydraulic motor connected at one end to saidY frame and at the other end to gearing connected to said road-working implement to shift the latter laterally of said frame and hold the same in adjusted position while said motor acts as a strut to resist back pressure during operation of said road-working implement.

11. In a road grader, the combination with a Wheel supported frame, of longitudinal shafts journaled to the sides of said frame and having arms extending radially from the ends thereof, a drawbar connected to said frame, a road-working implement mounted on said drawbar, extensible hangers connected pivotally to said drawbar and also connected pivotally to two of the said arms on opposite sides of said frame, separate reciprocating hydraulic motors connected between said frame and the other two arms on opposite sides of said frame, and means for effecting operation of said hydraulic motors individually and the locking thereof in adjusted positions.

12. In a road grader, the combination with a wheel supported frame, of a drawbar flexibly connected at its forward end to said frame, a moldboard carried by said drawbar, space'dapart hangers connected to said drawbar, spaced-apart longitudinal rock shafts connected to said hangers, upright reciprocating fluidpressure motors connected to said rock shafts, laterally shifting mechanism connected to said drawbar, .a reciprocating fluid pressure motor connected to said laterally shifting mechanism to actuate the same, and means for controlling said motors to effect lateral shifting of said moldboard and adjustment thereof in elevation and inclination relative to the vertical.

13. In a road working machine, the combination with a vehicle, of a road working implement, a drawbar for carrying said road working implement, spaced-apart extensible hangers at the sides of said frame and connected at their lower ends to said drawbar, spaced rock shafts at the sides of said frame and connected to the upper ends of said hangers, two reciprocating hydraulic motors one connected to one of said rock shafts and the other connected to the other roclk shaft, means for controlling said motors individually, a laterally shiftable device at the rear portion of said frame and spaced rearwardly from the rear end of said drawbar, an extensible connection extending rearwardly from said drawbar to said laterally shiftable device, said connection being pivoted to the rear end of said drawbar o-n a horizontal axis-and means for actuating said laterally shiftable device in co-operation with said motors connected `to hangers of adjusted lengths to secure adjustment of the road working implement in elevapressure motors connected to said rock shafts for individual actuation thereof, a laterally shiftable device mounted on'said frame, flexible connections extending rearwardly from said drawbar to said laterally Vshiftable device, `a pump mounted o-n said frame, an engine mounted Von' said frame and connected' to said pump to operate the same, means for shifting said device laterally relatively to said frame to effect lateral shifting of said moldboard, and operator-controlled means for connecting the pump to either fluid pressure motor to effect adjustment of the moldboard in elevation and in inclination transversely of the roadway.

15. In a road working machine, the combination with a vehicle frame, of a drawbar flexibly connected at its forward end to said frame, spaced-apart hangers pivoted at their lower ends to the free end portion ofsaid drawbar, spacedapart rock shafts mounted on said frames and each having laterally extending arms at their ends, the arms at the forward ends of said rock shafts being pivoted to the upper ends of said hangers, reciprocating uid pressure motors pivotally connected at their lower ends tosaid frame and pivotally connected at their upper ends to the arms .at the rear ends of said shafts, a moldboard carried by said drawbar, and means for controlling said motors to effect lifting and lowering of said hangers individually to adjust the elevation and inclination of the moldboard relative to the roadway.

16. In a road grader, the combination with a wheel supported frame, of spaced-apart longitudnal rock shafts mounted thereon, a drawbar flexibly connected at its forward end to said frame, a road-working implement carried by said drawbar, crank arms extending radially from said rock shafts, spaced-apart hangers pivotally connected at their ends to said crank arms and said drawbar, means between the said frame and the rear end of said drawbar for shifting the road-working implement laterally relatively to said frame, reciprocating hydraulic motors pivotally connected to said frame and to said crank arms, and means for effecting operation of said hydraulic motors to actuate the hangers for co-operation with said laterally shifting means to adjust the position of the road-working implement relative to the frame and the road surface.

17. In a road grader, the combination with a wheel supported frame, of longitudinal rock shafts journaled to said frame to occupy spacedapart positions, crank arms extending radially from the said rock shafts, a road-Working implement, a drawbar flexibly connected at its forward end to said frame and carrying said road-working implement, spaced-apart upright hangers pivotally connected at their lower ends to said drawbar and pivotally connected at their Sil upper ends to 'twoiof said crank arms one onA one rock-'shaft and the'other on the other rock'shaft.'

ofVr said hydraulic lmotors individually to effect adjustment of the road-working implement and the locking of the same in adjusted position.

185A road-working machine comprising a supporting frame,A of a road-working implement adjustably-mounted thereon, arrack bar mounte'd v"on said frame and connected to said road- Working implement, an additional rack bar, a duid-pressure motor connected between said frame'and said additional rack bar, and gearingbetween said rack bars to effect upon operation'of the motor the adjustment of the roadworking 'implement relative to said frame by shifting said first-named rack bar relatively toisaid frame.

19.In aroad-working machine the combination with a Yvehicle of a road-working implement adjustably mounted thereon a laterally shiitabl'e Vdevice.""mounted on'said frame and! connected t Esaid' 'road-'Working implement a 1-e-"V ciprocatingniotor operable in a; direction transversely. of' said-'laterally shiftable device, and operating connections between said motor and said device for effectingshifting of the latter laterally of the franieupon operation of said motor 'to `adjust said `road-working implement relative tor-'saidframn` f 20. In a 'device 'of the class'described, the comable mem'berto eiect adjustment o'f the latter` relative to said'vel'licle:`

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