US2854767A - Fine grade planer device - Google Patents

Description

Oct. 7, 1958 R. w. SMITH FINE GRADE PLANER DEVICE 4 Sheets-Sheet 1 Filed Oct. 6, 1954 Fill.

INVENTOR Rondo/pl? W Smith M E ATTORNEYS ATTORNEYS Oct. 7,- 1958 R. w. SMITH FINE GRADE PLANER DEVICE Eiled Oct. 6, 1954 Oct. 7, 1958 RAN; SMITH 2,854,767

FINE GRADE PLANER DEVICE Filed 001;. e, 1954 Y 4 sneets-sneet 3 INVENTOR Edda/pf? W Sm/fh I ATTORNEYS Oct. 7, 1958 R. w. SMITH FINE GRADE PLANER DEVICE 4 Sheets-Sheet 4 Filed Oct. 6, 1954 INVENTOR Randal ATTORNEYS United States Pati I FINE GRADE PLANER DEVICE Randolph W. Smith, Dallas, Tex., assignor of one-third to W. F. English and one-third to Clifford W. English Application October 6, 1954, Serial No. 460,682

6 Claims. (Cl. 37-108) This invention is concerned with a planer machine for cutting, shaping and grading the surface of the bed of a street, road, runway, taxi strip, loading ramp or other surface, preparatory to laying pavement, or other surface covering, thereon. a

Before applying pavement to the surface of a roadbed, or other like surface, it is necessary to shape such surface to the proper contour and to plane it smooth.

It is customary to crown the surface of a roadbed or street, and to incline the curves thereof with a subtially flat surface.

In preparing the surface of a landing strip, taxi strip, loading ramp, or parking area, it is necessary to plane the surface fiat.

In any event, the surface must be perfectly smooth before'applying pavement. The surfaces of roadbeds and streets are shaped with crowns of varying heights, the crown being the height of the middle line of the road or the like, above the lower edges of side rails or forms on which the planer machine runs.

Streets, roads, runways and the like are also made of varying widths.

It is therefore desirable that the planer machine, employed in cutting and shaping the surface to be paved, be capable of quick and easy adjustment in width, height and in the contour of the blades thereon, to make it quickly adjustable to varying conditions mentioned above.

The present invention is intended to satisfy these requirements.

It is customary to mount the planer machine on rails (which are usually concrete pouring forms) extending along each side of the roadbed, or the like, by means of wheels which run upon the rails, and the height of the planer is adjusted to cut the proper crown on the roadbed, and the blades thereon are angularly adjusted in or der to cut the desired surface contour. I

' Planer devices heretofore employed have usually been pulled by a tractor, employing ahitch. i

In cutting the surface of a roadbed or the like with a planer, it is usually necessary to make repeated passes over the surface being planed in order to get it perfectly smooth, and planed to the desired contour. In performing this operation, it has been the practice to jack up the planer frame with relation to the wheels, by means of a jack provided on the planer. This operation is diflicult and time consuming.

In some instances, rather than take the time to jack'the frame up, the operator has merely backed the planer over the surface being planed, without raising the blades, thus gouging and damaging the surface already planed, making repeated repasses necessary.

It was often the case that in backing the planer for making another pass, the rails were turned over or the wheels jumped the rails, necessitating the readjustment of the planer and the remounting of the rails.

The present invention contemplates a planer attachment;

which may be mounted to a conventional motor grader 2,854,767 Patented on. '7, 1958 so that it may be raised and lowered by the conventional power means provided on the motor grader, to permit it to be quickly positioned on the side rails and quickly picked up from the rails, and to permit quick and repeated repasses along the grade, thus eliminating the danger of damaging the gradealready worked and turning over the rails.

It is therefore a primary object of this invention to provide a planer for planing and conditioning the surface of roadbeds, and the like, which may be detachably mounted to the mold board of a standard m'otor grader, so that it may be raised and lowered by conventional power means mounted on the motor grader to permit the planer to be quickly positioned on the side rails and quickly removed from the side rails and quickly picked up from the rails and moved backward with the motor grader to permit quick and repeated repasses along the grade without damaging the surface of the roadbed, and eliminating the danger of displacing or turning over the rails.

A further object of this invention is to provide quick and accurate means on a planer device for adjusting the angle of the individual blades thereon, in order to set the blades for cutting the desired contour of the grade.

A still further object of this invention is to provide quick and simple means for adjusting the height of the blades to provide for cutting the desired height or crown of a grade.

Another object of this invention is to provide a frame for a planer made of telescoping sections whereby the width of the frame may be varied to conform to the predetermined width of a roadbed :or other surface to be planed.

Still another object of this invention is to provide quick and simple means for adding or decreasing the number of individual blades carried on the frame of a planer when the frame is adjusted in width. Other and further objects of this invention will become apparent upon reading the detailed specification hereinafter following, and by referring to the drawings annexed hereto and made a part hereof.

A suitable embodiment of my invention is shown in the attached drawings, in which: I

Fig. I is a front perspective view of the planer device Fig. II is a front elevational view of the planer device mounted for movement on conventional side rails or forms extending along the sides of a roadbed, or the like.

Fig. III is a top plan view of the planer device mounted on side rails extending along the sides of a roadbed, or the like.

'Fig. IV is an end elevational view of the planer device illustrating the adjustability of the frame thereof, with reference to the flanged wheels at each end thereof.

Fig. V is a cross-sectional view taken along the line VV of Fig. H.

Fig. V1 is a cross-sectional view taken along the line VIVI of Fig. II.

Fig. VII is a fragmentary perspective view showingone of the pockets attached to the rear side of the central tubular frame member for receiving the lower corner of a mold board, attached to a motor grader.

Fig. VIII isa fragmentary perspective view showing the adjustable mounting of an individual planer blade attached to the front side of the central tubular frame member.

Fig. IX is a fragmentary front elevational view of an end of the planer device showing the adjustable mounting for one of the flanged wheels, and one of the skids on which the planer device may be mounted when not in use, or when being transported.

Fig. X is a perspective View of the skid.

Fig. XI is a rear perspective view of the mountin bracket for mounting selected numbers of blades on an end section of the telescoping frame for the planer device.

Fig. XII is a fragmentary top perspective view of one of the hook assemblies mounted on the top side of the central frame section, having a hook thereon engageable with the top edge of the mold board on a, motor grader for securing the planer device to the mold. board.

Numeral references are employed to designate thefvar i-j ous parts shown in the drawings, and lil e numerals designate like parts throughout the various figures of the drawings.

Referring, first, to Fig. I, the planerdevice, constituting the subject of this-invention, is shown attached. underneath the frame of a conventional motor grade be tween the front and rear wheels of the motor grader.

The motor grader 10. has a conventional mold board 11 attached thereto, said mold board 11 being secured to a standard mold board mounting circle 12, attached to the frame of the motor grader, in the usual and customary way.

The circle 12 is arranged to be raised and lowered by means of conventional hydraulic rams 13, carried by the frame of the motor grader. Each of the rams 13 has a piston actuated rod- 14 extending therefrom arranged to be extended and retracted by hydraulic power, and the outer ends of the rods 14 are attached to the mounting circle 12, so that upon retraction of the rods 14, the circle 12, mold board 11, and the planer. device carried thereby, may be raised, and such elements may be lowered upon extension of the rods 14.

The main frame for the planer-device includes a central tubular section 16 and end tubular sections 17 and 18, the end, sections 17 and 18 being slidably and telescopically arranged with relation to the central tubular section 16. Thereby, the length of the main frame for the planer device may be adjusted by sliding the end sections 17 and 18 with relation to the central section 16.

After the length of the frame has been adjusted, the sections 16, 17 and 18. may be attached together in fixed relationship by means of conventional dowel pins 15, which extend through the adjoining frame sections and are held in place by means of set screws b, which threadedly extend through the head lugs 15a, and engage the pins 15. End sections 17 and 18 preferably have a plurality of longitudinally spaced holes. 15c therein to receive the dowel, pins 15 so as to, permit telescoping adjustment of end sections 17 and 18 with, relation to the center section 16. i

A pair of spaced pockets 19. are secured on the rear outer side of the central tubular section 16 below the longitudinal axis of the frame member 16. The detailed construction of one of thepockets19 isshownin Fig. VII, which includes a side wall 20 welded to the frame section 16, and an angled bottom 21 weldedtothe side wall 20 and to the undersideof the frame member 16. The lower corners of the mold board 11 are arranged to disengageably enter the oppositely disposed pockets. 15' in the manner illustrated in Fig. VI.

The upper edge of the mold board 11 is attached to the central frame member 16 by means of spaced hook assemblies, one of which is shown in detail in Fig.;Xll, and generally indicated by. the numeral 22.

portion 27 thereon which is threadedly engaged with a nut 28, said nut being secured to the inner face of the hook head 32. An adjusting nut 29- is fixed to the bolt 4 in order to provide a wrench-engaging surface for turning the bolt 25.

The hook head 32 includes a bill portion 30. The inner side 31 of the bill portion is curved to substantially the contour of the mold board 11, so that when the hook head 32 is engaged with the upper side of the mold board blade, in the manner shown in Fig. VI, the bill 30 of the hook will conform to the outer side thereof as it is engaged therewith.

It will be seen that when the lower corners of the mold board 11 are inserted and engaged in the pockets 19, the hooks may be pivoted about the pivot pin 24 to engage the hook heads 32 with the upper side of the mold board. Each hook head 32 may then be adjusted into tight engagement with the upper side of the mold board by turning the adjusting bolt 25 in a direction to shorten the distance between the hook head- 32 and the associated pivot pin 24 as the threads 26 and 27 are turned through the pivot pin 24 and nut 28, respectively.

The planer device is thus securely attached to the mold board 11, and may be moved upwardly and downwardly therewith by actuation of the hydraulic rams 13 provided on the motor grader 10.

When so mounted, the planer device is suspended underneath the frame of the motor grader and is movable with the motor grader, and may be transported thereby.

It will be apparent that the planer device can be. attached to the mold board on any type of motor grader, the motor grader 10 shown herein being merely illustrative.

A. plurality of individual. planer blades 35 are adjustably mounted in side-by-side relationship along the front side of the. central tubular frame section 16, and the blades 35 are so mounted that they may be individually adjusted. in angular position, in the manner which will he hereinafter described. The blades 35 are adjustably mounted to a flat mounting plate 36, which is welded to the front side of the central tubular frame section 16, and the plate 36 is coextensive with the length of the tubular section 16.

Each of the blades 35 includes a shank portion 37 of lesser width than the cutting edge of the blade. (See Figs. VI and VIII.) Each blade 35 is suspended to a pair of L-shaped brackets 38, welded to the mounting plate 36, by means of a pair of rods 39' welded at one end to the shank 37. Each of the adjusting rods 39 has threaded portions 40 at the upper end thereof which detachably extend through holes in the brackets 38. Ad

justing nuts 41 and 42 are threadedly engaged about the The hook assembly 22 includes a pair of spaced cars.

23 welded to the upper side of the frame member 16', and.

threaded portions 40 on the upper and lower sides of the brackets 38, respectively.

The shank 37 of each blade 35 is adjustably carried between a pair of spaced angled. lugs 45, which are welded to the outer'side of the mounting plate 36. The pair of lugs 45 provide oppositely disposed grooves 46 in which the opposite edges of the shank 37 of the blade 35 is disposed. The shank 37 is loosely disposed in the grooves 46, there being sufficient space between the outer edges of the shank 37 and the inner edges of the grooves 46 to permit the shank to be angularly cocked in the grooves 46. This arrangement permits the angular disposition of the blade 35 to be varied and adjusted.

Each blade 35 is mounted in the same manner as de scribed above.

The blade 35 may be adjusted in height by adjustment of the nuts 41 and 42. on the rods 39 to move the shank up or down in the lugs 45. The angular disposition or slant of the blade 35 may also be adjusted and varied by adjustment of the nuts 41 and 42 on the rods 39. For

instance, if it is desired that the left end of the blade 35,.

shown in Fig. VIII, be raised, the nuts 41 and 42 may be so adjusted as to raise the left rod 39, thus raising.

the left side of blade 35,, and disposing the blade 35 at an angular position, withrelation to the mounting plate ,The blades 35 are shown in Fig. II as being so adjusted at such angular disposition as to provide a curved cutting edge for cutting and planing a rounded contour on the surface of a roadbed, or the like.

The blades 35 may also be adjusted so that the cutting edges thereof are in horizontal alignment in order to cut and plane a flat surface. In fact, the blades may be varied in contour to cut a surface from flat to a rounded crown of six inches or more.

At each end of the planer device is disposed a wheel mounting and adjusting assembly, both of which assemblies are exactly the same in construction, and operation and a description of one such assembly will sutfice for both.

Such end assembly includes an elongated box-shaped frame 49 which is welded or otherwise securely affixed to the tubular end sections 17 or 18 of the main frame.

A pair of spaced wheel adjusting brackets 50 are secured to the upper, inner side of the box member 49 by means of welding or other suitable means of attachment. The upper edge of each of the adjusting brackets 50 is arcuate in shape and a plurality of adjusting holes 51 are arranged in spaced relationship about the upper edge of each of the brackets 50. The bolts 52 are arranged to pass through the holes 51 and through the lever arms 53, in order to provide for fixing the levers 53 in selected positions after adjustment of the main frame of the planer device in height, in the manner which will be hereinafter explained.

The lower end of each of the levers 53 is secured to a shaft 54, which shafts 54 rotatably extend through the box member 49 and are each rotatably mounted on the bearings 55 and 56, secured in opposite sides of the box member 49. An eccentric crank arm 57 is secured to the inner end of each of the shafts 54, and the outer end of each of the crank arms 57 is attached to an axle 58 on which the flanged wheels 59 are rotatably disposed. The flanged wheels 59 are arranged to engage and roll upon conventional side rails 60, extending along the opposite sides of the roadbed or other surface being planed. The side rails 60 are usually forms used for retaining concrete when poured.

The main frame of the planer device may be raised and lowered by movement of the levers 53. The movement of one of the levers 53 causes its associated crank arm 57 to arcuately move about the longitudinal axis of the shaft 54, thus arcuately carrying with it the wheel 59, thereby raising or lowering the wheel. The entire main frame of the planer device may be raised or lowered with relation to wheels 59 by moving the levers 53 in proper direction to raise or lower the wheels at each end to a substantially common level.

After the frame of the planer device has been adjusted to the desired height to cut the desired crown on the roadbed, or other surface being worked, the lovers 53 may be fixed in relationship to the brackets 50 by passing the bolts 52 through the levers 53 and through the holes 51 in the brackets 50.

By way of illustration, one of the wheels 59 is shown in Fig. IV as being in maximum raised position, and the other of the wheels 59 is shown as being in maximum lowered position. It will be understood, however, that in actual operation each pair of wheels 59, on opposite ends of the planer device, will normally be in the same horizontal plane.

In any event, the wheels at each end of the planet device may be adjusted to a selected height, and in relative angular disposition, within the range of adjustment provided by the levers 53 and brackets 50.

A blade 63 is attached as a part of each of the end assemblies. Each blade 63 is adjustably mounted to the tubular end sections 17 and 18 at each end of the frame of the planer device in the manner hereinafter described.

. An angled mounting plate 64 is welded to the front side bolts 66 adjacent the upper and lower faces, respectively,

of the dogs 68. I

The blade 63 may be adjusted in angular position by adjusting the nuts 69 and 70 on the bolts 66, in order to adjust the angular disposition of the blade 63 to cut the desired contour of the surface of a roadbed or other surface to be planed. I Each blade 63, at opposite ends of the planer device,

is constructed and mounted in exactly the same way, and

the above description applies to both.

A removable and interchangeable blade mounting frame is provided for removable attachment to the tubular end sections 17 and 18 of the main frame. The detailed construction of such blade mounting frame is shown in Fig. XI and designated generally as 73. Such frame includes a face plate 74 having spaced, substantially C- shaped, straps 75 welded, or otherwise securely attached, to the inner side thereof. Each of the straps 75 is comprised of spaced side members '76, and the curved engaging rods 77 are pivotally'attached between the lower outer ends of the sides 76 of straps 75 by means of pivot pins 78. The rods 77 may be pivoted outwardly about the pins 78 to allow one of the tubular end sections 17 or 18 to be inserted between the opposite legs of the straps 75, and the rods 77 may then be engaged about the end section 17 or 18 by passing the upper ends of the rods 77 between the upper outer ends of the spaced side members 76 and secured in place by threading the nuts '80 downwardly on the bolts 77 against the lugs 79, which lugs are engaged with the upper edges of the straps 75. Thus, the frame 73 is detachably mounted to the end sections 17 or 18.

The blade mounting frame 73 is secured against rotatational movement with relation to the end section 17 or 18 by means of a dowel pin 82 which passes through sleeve 81 Welded to one of the side members 76 of the strap 75, and through the end frame member 17 or 18. The dowel pin 82 is fixed in relationship to the sleeve 81 by means of a set screw 83.

Frame 73 is arranged to adjustably and removably carry one or more blades 85. Each of the blades 85 includes a shank portion 86 to which is welded a pair of adjusting pins 87. Pairs of spaced and angled mounting lugs 88 are secured to the outer side of the face However, the pairs of wheels 59 at opposite ends of I the planer device may be positioned on different levels in order to cause the main frame of the planer device to slant from one end to the other. This adjustment may be necessary where the surface of a roadbed may be sloped from one side to the other. 7

Also, the wheels in each pair of wheels 59, at opposite ends'of the planer device, could be adjusted on different levels in order to adjust the pitch of the blades 35, 63 and 85 on the planer device.

plate 74. The upper ends of the adjusting pins 87 are threaded and freely pass through holes 93 in the lugs 88. Adjusting nuts 89 and 90 are threadedly engaged with the upper ends of the bolts 87 on opposite faces of the lugs 88.

The shank 86 of each of the blades 85 is loosely carried in pairs of guide brackets 91, secured to the outer side of the face plate 74. The guide brackets 91 are exactly the same in construction as the angled lugs 45,

hereinbefore described. Sufficient clearance is provided between the edges of the shank 86 of blade 85 and the inner edges of the guide brackets '91 to permit the shank 86 to be cocked in a diagonal position with relation to the guide brackets 91, in order to permit the blade 85 to be adjusted in angular position in the manner shown in Fig. I'X. Such adjustment may be made by adjust,- ing the, nuts 89 and 911 to raise or lower the, opposite, edges of the shank 8.6..

In the embodiment shown, herein, eachof the detachable blade mounting frames 73, at each'end of the planer device, is shown carrying three. blades85. This is merely illustra ive, and. it. will be apparent that, the frame 73 may be m de of such length as. to carry any desired number of blades 85, in order to accommodate any length of adjustment of the end sections 17 and 18.

For instance, itmay be desired to telescope the end sections 17 andf18 with, relation to the. central section 16 of the. main frame, so. that the end. sections will ac.- commodate only one blade. In such event, the; blade mounting frame 73. will. be made of such length as to carry only one: blade and the. blade 85, carried thereby, will bev disposed; in side-by-side relationship between a blade 35. and a blade 63. y

It is contemplated that each of the blades'35 and 85 will be made in one. foot widths, and, it is further contemplated that the standard equipment for eachplaner device will include detachable frames 73 to accommodate different numbers of blades 85, so that the adjustment in width of the cutting face of the planer device may be varied from one foot to any number of feet. desired.

Such adjustment in width may be accomplished by simply telescoping or expanding the end sections 17 and 18 with relation to the central section 16 and attaching blade mounting frames 73. to end-frame sections 17 and 18, carrying the. desired number of blades 85.

It is desirable to mount theplaner device on skidswhen not in use, or when it is beingtransported.

A suitable form of skid is shown in Fig. X, and generally indicated by the numeral 94. Such skid includes a. flat base plate 95 arranged to rest upon the ground or other supporting surface, and the outer ends of the base 95 are turned upwardly to provide inclined wings 96. Spaced vertical side members 97 are secured to the upper side of the base 95 by means of reinforcing braces 98 welded to the base 95 and to the outer sides of the vertical side members 97. A web 99- is secured between the vertical side members 97, and such web 99 has a pair of spaced bolt holes 100 therethrough. The upper ends of the vertical sides 97 are extended above the web 99 to provide a pocket. 102 in which the box member 49 may rest, and the box member 49 may be secured to the skid 94 by passing the bolts 101- through the holes 100 in the web 99.

In order to mount the planer device on the skids, the planer device is lifted by hydraulic power on the motor grader and the wheels 59 at each end of the planer device are raised by actuating the levers 53 to the position shown in Fig. IX. One of the skids is placed in position under each of the box members 49 at each end of the planer device. The planer device is lowered, and the box members 49 are guided into the pockets 1 32, and secured to the skids 94 by the bolts 101. The planer device may then be detached from the motor grader and left supported on the skids 94, and it may be lifted onto a truck bed, or other transporting vehicle, where it may rest upon the skids 94.

The operation and function of the planer device is believed to be apparent from the foregoing description. it is attached to the mold board 11 on a motor grader by positioning the mold board over the pockets 19 and lowering the mold board until the lower corners of the mold board enter the pockets 19. The books 32 are then engaged with the upper edge of the mold board 11 and adjusted into firm engagement therewith, in the manner hereinbefore described. The planer device may then be lifted by hydraulic power on the motor grader and transported to the desired place of use, over aroadbed or other surface to be planed and shaped. The planer device may then be lowered until the flanged wheels 59 engage the 8.] rails 60 at each side of the roadbed, or other surface being worked, and the proper height of the main frame of the planer device may be adjusted to cut the desired crown of the roadbed' or other surface, by actuating and adjusting the 1evers53, in the manner hereinbefore described. v

The angular disposition of the blades 35, and 63, may be adjusted to cut the. desired contour of the roadbed', in the manner already described; and the width of the planer device may be adjusted by telescoping or expanding the tubular end frames 17 and 18 with relation to the central tubular frame 16 Detachable blade mounting frames 73,v carrying suitable numbers of blades 85, may be mounted on the tubular end sections 17 and 18.

After such adjustments, the planer device is in position to cut the surface to, be planed and shaped.

The motor grader may be moved forward with, the blades 63, 35 and 85' in penetrating contact with the surface being planed, As, it, moves forward, the top of, the surface is shaved off by the blades to the contour and depth at which the planer device, is set.

When it, is, desired. that another pass be made over the surface being planed, the entire planer device may be lifted from the rails 60 by'the hydraulic power on the motor grader, and the motor grader may be backed up and the planer device, may be again lowered until the wheels 59 are in contact with rails 69. The planer device-may then. be, again moved forward to cut and plane any irregularity in the surface previously gone. over. Repeatedpasses may thus be made until the surface is perfectly smooth and shaped to. the correct contour.

When it is, desired to remove the planer attachment from the roadbed or other surface being worked, it is merely necessary to. pick up the entire planer device by the hydraulic power on themotor grader, and it may be. transported to a desired place where it may be mounted on the skids. 9.4. The books, 32. may be detached from the. mold board 11, and the mold board may be raised to disengage. it from the pockets 19. The motor grader is then in condition to be used for its customary purposes.

Thus, I have provideda planer device which may be quickly and easily adjusted in height, to cut the desired crown on a. roadbed, or other surface, which may be quickly and easily adjusted in width, and which has blades thereon which may be quickly and easily adjusted to cut the. desired contour of the surface to be planed, and. in which the, desired number of blades may be attached. at the ends as the width of the planer device is adjusted.

I have provided. a planer device which can be detachably mounted to the mold board of a motor grader and which can be raised, lowered and transported by the motorgrader, so that it may be raised above the surface being planed and. disengaged from the side rails when it. is moved backward for making, repasses over the surface being planed; thereby eliminating the dangers of gouging and damaging the surface and turning over the side rails, as the planer device is moved backward.

It will be-apparent that other and further forms of my invention may bedevised without departing from the spirit and. scope of the appended claims.

I claim:

1. In a planer device, a main frame comprised of a central tubular section and end tubular sections telescopically arranged with relation to the central section; a plurality of planer blades carried by the central section; a blade frame detachably secured to each end section, said blade frame including a face plate with spaced straps thereon arranged to embrace the end tubular member; means. to secure the. straps in place about the end tubular member; and a plurality of planer blades adjustably carried by the face plate.

2. In a planer device arranged to be attached to a motor grader having a mold board thereon, an elongated. tubular frame comprised of a central tubular. section and.

end tubular sections telescopically arranged with relation to the central section; a plurality of planer blades adjustably carried by the central section; a plurality of planer blades adjustably carried by the end sections; means on the rear side of the central tubular section located below the longitudinal axis of said section arranged to receive the lower edge of the mold board; means for attaching the mold board to the said central tubular section in such position; and power means on the motor grader arranged to raise and lower the mold board and the frame.

3. A planer device arranged to be attached to a motor grader having a mold board thereon including, an elongated tubular frame comprised of a central tubular section and end tubular sections telescopically arranged with relation to the central section; a plurality of planer blades adjustably secured to the front side of the central section, a plurality of planer blades adjustably carried by the front side of the end sections, and arranged in horizontal alignment with the blades on the central section; the said mold board embracing the rear arcuate side of the central tubular section with the lower edge of the mold board extending below the longitudinal axis of the said central tubular section; and means for detachably securing the central section to the mold board in such position; and power means on the motor grader arranged to raise and lower the mold board and the frame.

4. A planer device arranged to be attached to a motor grader having a mold board thereon including, an elongated tubular frame comprised of a central tubular section and end tubular sections telescopically arranged with relation to the central section; a plurality of planer blades adjustably secured to the front side of the central section, a plurality of planer blades adjustably carried by the front side of the end sections; a pair of pockets on the rear side of the central section arranged to receive the lower corners of a mold board; adjustable attaching means attached to the central frame section and arranged to be engaged with the top edge of a mold board.

5. A planer device arranged to be attached to a motor grader having a mold board thereon including, an elongated tubular frame comprised of a central tubular section and end tubular sections telescopically arranged with relation to the central section; a plurality of planer blades adjustably secured to the front side of the central section, a plurality of planer blades adjustably carried by the front side of the end sections, and arranged in horizontal alignment with the blades on the central section; a pair of pockets on the rear side of the central section arranged to receive the lower corners of a mold board; a pair of adjustable hooks pivotally attached to the upper side of the central section and engageable with the top side of the mold board; a pair of flanged wheels on each end of the frame; and means to adjust the relative height between the wheels and the frame.

6. A planer device arranged to be attached to a motor grader having a mold board thereon including, an elongated tubular frame comprised of a central tubular section and end tubular sections telescopically arranged with relation to the central section; a plurality of planer blades adjustably secured to the front side of the central section, a plurality of planer blades adjustably carried by the front side of the end sections; a pair of pockets on the rear side of the central section arranged to receive the lower corners of a mold board; and means for detachably securing said central tubular section to the mold board after the corners of the mold board have been inserted in the pockets.

References Cited in the file of this patent UNITED STATES PATENTS 1,543,223 McVeety June 23, 1925 1,678,113 Gustafson July 24, 1928 1,768,663 Carr July 1, 1930 1,849,754 Darrow Mar. 15, 1932 1,926,397 Mosel Sept. 12, 1933 1,995,629 Baker Mar. 26, 1935 2,224,084 Mills et a1 Dec. 3, 1940 2,310,396 Clinkscales Feb. 9, 1943 2,416,401 Meisenburg Feb. 25, 1947 2,616,193 Toepfer et a1 Nov. 4, 1952 2,662,311 Chattin Dec. 15, 1953 FOREIGN PATENTS 133,010 Sweden Sept. 25, 1941

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