US3045765A - Reversible disk plow - Google Patents

Description

July 24, 1962 R. E. cox ET AL REVERSIBLE DISK PLOW 4 Sheets-Sheet 1 Filed Dec. 7, 1960 IN VEN TORS- ROBERT E. COX

JAMES F. SULLIVAN AT RNEYS July 24, 1962 R. E. cox ET AL 3,045,765

REVERSIBLE DISK PLOW Filed Dec. 7, 1960 4 Sheets-Sheet 2 INVENTORS. ROBERT E. CO

JAMES F. SUL AN ATTORNEYS July 24, 1962 Filed Dec. '7, 1960 FIG.5

R. E. COX ET AL REVERSIBLE DISK PLOW 4 Sheets-Sheet 5 INVENTORS. ROBERT E. COX

JAMES F. SULLIVAN y 1962 R. E. COX ET AL 3,045,765

REVERSIBLE DISK PLOW Filed Dec. 7, 1960 4 Sheets-Sheet 4 I88 I88 I97 I97 |9| 195 I96 I l9l r I86 I86 l8! FIG. 6 I82 I82 [940 l94b f 52 INVENTORS.

ROBERT E. COX

JAMES F. SULLIVAN BY United States Patent 3,045,765 REVERSIBLE DISK PLOW Robert E. Cox, Rock Island, and James F. Sullivan, East Molme, 111., assignors to Deere & Company, Moline, 11]., a corporation of Delaware Filed Dec. 7, 1960, Ser. No. 74,273 16 Claims. (Cl. 172-212) The present invention relates generally to agricultural implements and more particularly to disk plows of the tractor carried reversible type.

The objects and general nature of the present invention is the provision of a reversible disk plow of the integral or tractor carried type and a plurality of disks supported on a swingable beam that can be swung from the right hand plowing position to the left hand plowing position, and vice versa, with new and improved means for supporting the swingable end of the disk-carrying beam, which beam also includes means for automatically changing the angle of the disk standards in the swingable beam, whereby, in either plowing position, the disks are disposed at the proper angle relative to the direction of travel.

More specifically, it is a feature of this invention to provide a reversible disk plow in which the laterally swingable disk-carrying beam is mounted for movement about a generally vertical axis located well towards the rear of the beam, with the front end of the lateral swingable beam supported on a laterally swingable pivoted bar, movement of which is utilized to bring the disks to the proper angle wherever the beam is reversed.

A further feature of this invention is the provision of new and improved means for automatically reversing the rear furrow wheel so as to secure the necessary amount of lead to maintain the correct width of cut and to keep the plow running straight in either right hand or left hand plowing position. More specifically, it is a feature of this invention to provide means for producing an accelerated movement of the rear wheel at the terminal portion of each reversal, link and lever means being provided on or connected with the reversible diskcarrying beam for this purpose.

A further feature of this inventionis the provision of new and improved scraper means associated with the reversible rear furrow wheel and operating automatically and correctly in either position of the rear furrow wheel.

These and other objects and advantages of the present invention will be apparent to those skilled in the art after a consideration of the following detailed description, taken in conjunction with the accompanying drawings in which:

FIG. 1 is a perspective view of a reversible disk plow in which the principles of the present invention have been incorporated.

FIG. 2 is a fragmentary perspective of the front portion of the plow, showing the disk beam supporting means.

FIG. 3 is a fragmentary perspective view of the rear furrow wheel, showing the automatically reversing scraper means associated therewith.

FIGS. 4 and 5 are fragmentary plan views of the rear wheel reversing means, showing the right and left hand plowing positions, respectively.

FIG. 6 is a face view of the disk scraper means of this invention.

FIG. 7 is a rear view of an auxiliary land wheel attachment for the rear furrow wheel.

Referring first to FIG. 1, the reversible disk plow of this invention is shown for purposes of illustration as carried by a conventional farm tractor, represented by a generally conventional 3-point linkage 20, which is shown as comprising a pair of lower tension links Zl,

an upper link 22 and lift links (not shown) connecting the lower links 21 with power-lift arm means (not shown) carried by the tractor and operated by power derived from the tractor for raising and lowering the implement. The front ends of the upper and lower links 21 and 22 are connected with the tractor through ball joint connectors or the like, and the rear ends of the links 21 and 22 carry similar ball joint connectors by which the links are connected to a coupling frame 23 to which the reversible disk plow of this invention is adapted to be connected in generally rigid relation. The coupler frame per se does not form any part of this invention and it sufl'ices to note that the coupler frame 23 includes lower hooks 24 and an upper hook section (not shown) and is similar to the coupler shown in US. Patent 2,979,- 137, issued April 11, 1961, to C. H. Hess. The reversible disk plow in which the principles or the present invent-ion have been incorporated is indicated in its entirety by the reference numeral 25.

The plow 25 includes a main frame 26 that is made up of a pair of generally fore-and-aft extending flat bars 27, the rear ends of which are shaped to extend rearwardly in converging relation and apertured to receive bolts 28 that fasten the bars 27 to a rear casting 29. The latter is provided with a rear vertical sleeve section 31 in which the vertical spindle 32 of the rear furrow wheel unit 33 is received, being vertically adjustable relative to the casting by means of clamp collars 34. The furrow wheel is indicated at 35 and per se is of usual construction. The wheel 35 is mounted for rotation on an axle member 36 that is square in section and disposed for lateral adjustment in a yoke 37 that is fixed, as by welding, to the lower or outwardly disposed portion 32a of the spindle member 32. The lower end portions 32a of the spindle 32 is shaped so as to dispose the wheel 35 at an angle relative to a vertical fore-and-aft extending plane.

The forward portion of the rear casting member 29 includes a vertical sleeve section 39 bored to receive a vertical shaft 4-1 that at its lower end is fixed to a laterally swingable beam 45, the shaft 41 being connected to the beam 45 adjacent the rear end of the latter. The beam 45 is made up of a pair of flat bars 4-3 apertured to receive a plurality of bolts 49 by which a plurality of disk standard bracket castings 50 are fixed in place in generally fore and aft spaced apart relation between the bars 48. The bolts 49 also fix a spacer block 51 in between the bars 48. A furrow opener 52 in the form of a disk is journaled for rotation through suitable bearing means and associated parts on the lower end of each of the disk standards 53 which is rockably disposed in the associated bracket casting 50 Fixed to the upper end of the rear disk standard 53 is a double armed member 54 having generally outwardly disposed apertured bifurcated portions 55 that receive associated angling links 56. The forward disk standard is indicated at 53a and also includes a double armed member 54a having generally outwardly disposed bifurcated portions 55a to which the links 56 are connected, as by pivot members 58. Similar pivot members 58 connect the links 56 to the rear arms 55.

The frame 26 at its forward portion includes a transverse structure 59 that is made up of an upper bar 60 to which rearwardly extending plates 61 and downwardly extending plates 62 are welded. The forward ends of the main frame bars 27 are turned downwardly, as at 63. Bolts 64 and 65 fix the frame bars 27 to the plates 6-1 and The latter are reenforced by a cross rod 66. The frame 26 also includes a central transverse structure 67 whichincludes an upper angle 68 rigidly connected at its ends to the frame bars 27 by a pair of bracket plates 69 fixed thereto by bolts 70. Spaced below the angle 68 is a cross channel 71 that is fixed to the frame 26 by angle brackets 72. The frame 26 also includes a central fore and aft extending structure 74 that includes a pair of bars 75 fixed at their rear ends to the rear. casting 29 (FIG. 1) by the bolts 28. The beam or sub-frame 45 is swingable between right and left hand positions, the rear portions of the beam or subframe bars 48 being bolted, as at 81, to an apertured casting 82 that is secured to and forms a part of the vertical spindle or shaft 41. The means supporting the forward portion of the laterally swingable beam or subframe 45 from the forward portion of the frame 26 will now be described.

A supporting bar 85 is carried for lateral swingable movement by the frame 26 and has its forward end slidably disposed between the angle 68 and the channel 71, as best shown in FIG. 2. The rear of the bar member 85 is provided with an opening to receive a pivot bolt 86 carried by a support bar bracket 87 fixed between the frame bars 75 by bolts 88 and 89. The bracket 87 is in the nature of a channel having a plurality of openings 91 in any one of which the pivot bolt 86 may be disposed. The pivot bolt 86 is located an appreciable distance ahead of the pivot shaft 41 carried by the bracket casting 29. The supporting bar 85 extends forwardly between and beyond the angle 68 and channel 71, which latter supports the forward portion of the bar 85. The forward standard-receiving arm member 54a is formed with a sleeve section 93 that slidably receives front end of the supporting bar 85, as will best be seen in FIG. 2. Thus, while the rear portion of the beam or subframe 45 is supported through the main pivot 41 and the associated rear frame casting 29, the forward portion of the beam 45 and associated parts are supported through the arm 54a by the laterally swingable supporting bar 85, the latter being carried on the frame 26 by the channel 71. The bar 85 slides along the channel 71 when the beam 45 is swung from one side to the other side.

The beam 45 is swung between right and left hand plowing positions by power means that preferably takes the form of hydraulically operated cylinder 100' having a piston rod 101 that is swingably connected with an arm 102 that forms the part of a bell crank 103 that is rigidly fixed to the upper end of the beam pivot shaft 41, as best shown in FIG. 1. The other arm 104 of the bell crank extends generally rearwardly and is formed with a bifurcated section 105 that is apertured to receive a pin 106 by which an axle arm 107 is swingably connected therewith. As best shown in FIGS. 4 and 5, the axle arm 107 has an extension 108 fixed integrally therewith, and the outer portion of the extension 108 is apertured to receive a pin 109 by which the extension 108 is pivotally connected to one end of a link 110, the other end of which pivotally receives a stud or pin 111 located on the adjacent portion of an L-shaped bracket 112 that is fixed by bolts 28 to the inner portion of the frame 26. It will be seen from FIGS. 4 and that the pin or stud 111 is disposed rearwardly and toward the right side of the pivot or spindle 41. The purpose of this arrangement will be explained below.

The arm 107 is formed with a channel section 115 in which a short bar 116 is pivotally mounted, as at 117, the fianges of the channel section 115 being spaced apart so that the bar 116 has limited movement in a generally horizontally plane longitudinally of the arm 107. The arm 107 is formed with an outer transverse section 119 that passes over the bar 116 and carries a pair of adjusting set screws .121 and associated lock nuts, whereby the position of the bar 116 and the arm 107 may be adjusted laterally. The rear end of the bar 116 carries a depending rod 125 that extends downwardly through the slotted portion 126 of an arm 127 that is clamped rigidly to the upper end of the rear wheel spindle 32 as best shown in FIG. 1. Fluid under pressure is directed to and received from the unit 100 by a pair of hose lines 130, the lines being connected into the hydraulic system of the tractor, which is conventional so far as the present invention is concerned.

The front end of the hydraulic unit is resiliently connected with an upwardly extending bracket 131 by means of an elongated shaft or rod member 132 that is slidably received in a fore-and-aft extending sleeve section 133 forming a part of the bracket 131. The latter is bolted at 134 and 135 to the front cross bar 59. The rear end of the rod member 132 carries an eye in which a detachable pin 137 is disposed and by which the rod 132 is connected with the power cylinder 100. Cushioning springs 140 are disposed at opposite ends of the sleeve 133 and are mounted on the rod 132, being retained in place, respectively, by an abutment 141 on the rear end of the rod and by a pair of lock nuts 142 threaded on the forward end of the rod 132. The purpose of these springs is to cushion the action of the power unit 100, and, more specificialy, to absorb any excess of movement of the power unit 100 over the required to shift the beam 45 from one position to another.

The adjustable means defining the right and left hand positions of the beam 45 will now be described.

Referring to FIG. 2, a plurality of openings 152, 153 and 154 are formed in the horizontal flange portion at each end of the angle 67, and the channel 71 is similarly apertured, forming means to receive stop bolts 155 that optionally may be taken out of the openings in which they are disposed, as shown in FIG. 2, and placed in other sets of openings 152, 153 or 154. The two stop bolts 155, each of which carries a bushing disposed between the channel 71 and the angle 67, serve as stops determining the extent of lateral movement of the beam 45 and the associated supporting bar 85 in either the right hand position or the left hand position. Obviously, when the bolts 155 are disposed in the outermost openings, as shown in FIG. 2, the beam 25 and bar 85 are permitted to swing laterally to the maximum extent, thereby providing for a greater width of out than is provided when the stop bolts 155 are disposed in other openings. For example, the narrowest width of cut is provided when the bolts 155 are disposed in the openings 154.

A disk angle adjustment is also provided, according to the present invention. First, it will be seen from FIGS. 1 and 2 that since the bolt 86 is ahead of the vertical axis defined by the spindle shaft 41, about which the beam 45 swings, and by virtue of the fact that the bar 85 is disposed in the sleeve section 93 of the forward arm 54a (FIG. 1), whenever the beam 45 is shifted between the right andleft hand plowing positions, the arm 54a experiences an angular displacement that is greater than the angular displacement experienced by the beam 45. Angular displacement of the arm 54a is transmitted by the links 56 to the rear arm 54. Thus, when the beam 45 is shifted from one position to the other, the disks 52 are angularly shifted through an extent greater than the angle through which the beam 45 is shifted. It is this disk angle that is capable of being adjusted, according to this invention, and which will now be described.

As best shown in FIG. 2, the support bar 85 is connected for swinging movement about the pivot bolt 86, the latter being located at the rearmost opening in the spacer channel member 87. If it should be desired, for example, to swing the disks into a position of noticeably smaller angle with respect to the forward direction of travel, the pivot bolt 86 may be disposed in either the intermediate or the forwardmost opening 91 so that when the beam 45 is reversed from one position to the other, the bar 85 will experience a greater angular displacement, with corresponding greater angular displacement of the associated disks, thus swinging them into a position of smaller angle relative to the direction of travel. This may be desirable, for example, when the plow is used in sandy soil, in which penetration is no problem or in heavy trash, wet ground and rocksoils where it is desirable to have the disks roll more freely. Generally speaking, however, disposing the bolt 86 in the rearmost position will give satisfactory results under most conditions, and the disks will penetrate hard ground and will revolve freely enough for most conditions. It is to be noted, also, that generally the pivot bolt 86 is placed in the intermediate or rearmost opening in the spacer channel 87 when the width-of-cut determining bolts 155 are placed in the outermost openings 152, and the bolt 86 is disposed in one or the other of the intermediate or forward openings 91 when the width-of-cut determining bolts 155 are disposed in certain of the laterally inner openings, such as 153 or 154.

The coupler frame 23, FIG. 1, is adapted to have the lower hook portions 24 engaged with the laterally outwardly extending studs 161 carried at the lower ends of the vertical frame bar portions 63, the lower end of the frame bar vertical portion 62 also carrying a similar stud (not shown). The hook section (not shown) at the upper central portion of the coupler frame 23 is adapted to be connected with a hitch bracket 163 that is bolted to the front portion of the frame 26 through a generally horizontal tie plate 164 (FIG. 2) that is secured, as by bolt 165, to a frame block 166 that is bolted in between the forward portions of the frame bars 75. The forward portion of the tie plate 164 is also bolted to the central portion of the transverse frame bar 59.

As will be seen from FIGS. 4 and 5, the length of the slot 126 and the effective radius of action of the arm or bar 116 are so proportioned that the rear furrow wheel 35 is swung through an angle such as is necessary to have the wheel disposed in the right position of lead, both for right-hand plowing and left-hand plowing. It will be seen that the action of the link 110 is to impart additional angular displacement to the arm 107 over and above that experienced by the arm 103 that is fixed directly to the vertical spindle shaft 41 to which the diskcarrying beam 45 is fixed. For example, where the beam 45 swings through an angle of about 50, which is ample so far as bringing the disks 5 2 to the desired positions is concerned, the link 110 and the arm 107 are so arranged that the arm 127 that is fixed to the rear wheel spindle 32 is shifted through an angle of around 200, thus assuring that the rear furrow wheel will have the necessary amount of lead in either position of operation.

The extent of the swinging of the rear wheel 35 when the beam 45 is reversed may be varied, as desired, by

shifting the position of the arm 116 relative to the arm 107, which may be done by loosening the bolt 117 and sliding the bar 116 to different positions longitudinally of the arm 107. The slot 170 (FIGS. 4 and 5) in the arm 107 accommodates the above adjustment. Also, the slot 126 in the steering arm 127 accommodates different positions of the bar 116 in the arm 107.

According to this invention and as best shown in FIGS.

1 and 6, new and improved scraper means is provided for each of the disks 52. A scraper supporting bracket 181, generally of L-shaped configuration, has a vertical leg connected by bolts 182 to the lower portion of the associated disk bearing standard 183, the same bolts serving to bolt the disk bearing standard to the lower portion of the associated disk spindle, 53 or 53a. The horizontal portion 184 of each scraper support bracket 181 extends forwandly and carries a stud 186 on which a scraper shank clamp 187 is pivoted for movement about a generally transverse axis. Each member 187 includes a vertical socket section 188 in which the upper or vertical portion of a scraper shank 189 is disposed. The generally vertical position of the scraper shank clamp may be adjusted by loosening set screws 191 and then shifting the shank 189, after which the latter are tightened to retain the adjustment desired. The lower end of the scraper shank is bent downwardly and rearwardly toward the disk and rockably receives a scraper blade 194, a clip 199 welded to each blade forming a generally vertical sleeve means rockably receiving the lower end of the shank 189. The scraper means 194 is held on the shank 189 by a cotter pin 195 or other suitable means. As best shown in FIG. 6, the lower end of each of the scraper blades is curved so as to fit snugly against the associated disk 52. The scraper blade 194 is held against the face of the disk 52 at all times by means of a spring 196, one end of which is anchored to a bracket 197 that is welded to the horizontal arm of the scraper support bracket 181. The other end of each spring 196 is connected to a lug 198 formed on the associated shank clamp member 187. Thus, even though the lower edges of the blades 194 may wear away in use, each spring 196 pivots the associated clamp member 187 so as to hold the blade continually against the face of the disk, for each blade 194 is permitted to swing about the lower end of the scraper shank 189 so that each blade fits snugly against the face of the disk notwithstanding any pivoting of the scraper shank clamp member 187.

Thus, by virtue of the construction just described, each disk scraper is free to swing :bodily toward and away from the face of the associated disk, and each scraper is also free to swing about a generally vertical axis as defined by the spindle 189. For example, if the disk 52 is rotated in the direction of the full line arrow shown in FIG. 6, pressure due to adhering soil on the disk tends to swing the lower edge of the blade 194a against the disk face, while the other scraper blade 194i) is free to swing away from the face of the disk so that any soil that is not scraped off by the blade 194a may easily pass underneath the other disk blade 194k. Similarly, if the disk 52 is rotated in the direction of the dotted line arrow, soil pressure holds the disk blade 194-b against the face of the disk while the other scraper lblade 194a is swingable away from the face of the disk to pass any adhering soil or the like that is not scraped off by the disk blade 1941;.

Referring now to FIG. 3, scraper means 200 is provided for the rear furrow wheel 35, which normally carries a wheel weight 201 having a generally conoidal periphery 202. A scraper arm bracket 205 is fixed by set screws, one of which is shown at 206, to the wheel end of the laterally adjustable square shaft 36. The bracket 205 includes a vertical socket section 208 that is apertured to receive a generally vertical scraper arm 209 carrying a horizontal portion 210 at its upper end, the horizontal portions lying well above the wheel 35.

A scraper block 215, preferably in the form of a casting that is generally of inverted V-formation, is swingably supported on the horizontal portion 210 of the bracket 209, being held in place by a pair of cotters 216. Opposite edge portions of the scraper block 215 are tapped so as to receive a pair of scraper blades 218 in the proper position. The lower edges 219 of the scraper blades 218 are disposed so as to fit snugly against the conoidal portion 202 of the wheel weight 201. The blade 218 is slotted at 221 to receive fastening bolts 222, and by loosening the latter, the blade 218 may be positioned on the scraper block 215 so that when the wheel rotates in one direction, as indicated by the arrow in FIG. 3, one of the scraper blades 218 is brought against the conoidal portion of the wheel weight 201 by the pressure of the soil adhering to the wheel weight edge 202, while the other blade 218 is spaced slightly away from the wheel weight 201, as indicated at S in FIG. 3. The scraper block 215 is freely pivoted to the upper end of the scraper arm 210 so that when the rear furrow wheel is reversed and rotates in the other direction the other scraper blade is brought against the edge of the wheel blade and the first blade is moved away there from. Thus, the scraper means automatically reverses whenever the rear furrow wheel reverses.

The generally horizontal portion 210 of the scraper arm 209 is made long enough and is apertured to reoeive a cotter 216, so that a second scraper means may be mounted on the scraper arm 210 in case a second or auxiliary wheel weight (201a, FIG. 7) is carried on the other side of the wheel 35. Such auxiliary wheel 7 weight preferably would be substantially identical with the wheel weight 201 shown in FIG. 3.

For use in soft and sandy soil conditions, where the rear furrow wheel 35 does not have suflicient flotation to keep the disks from penetrating too deep, we provide an auxiliary gauge wheel unit (FIG. 7) that includes a gauge wheel 220 substantailly identical with the rear furrow wheel 35 described above and other parts, such as the Wheel weights 201 and 201a mentioned above. In- FIG. 7, however, the gauge wheel 220 is shown as having a relatively short axle 220a fixed to the lower end of a generally vertical bar 223. The bar 223 is vertically adjustable in clamp means 224 carried at the outer end of a laterally extending square bar 225 having welded to the outer end thereof a plate 226 that forms a part of the clamp means 224. The inner end of the square bar 25 is bolted to a yoke casting 228 that includes upper and lower lugs 229 that are formed to receive the rear furrow wheel spindle 32, the latter having a keyway 232 and the lugs 229 carrying suitable cooperating means whereby the casting 228 is fixed rigidly against rotation relative to the spindle 32. The lugs 229 are disposed at opposite sides of the sleeve section 31 of the rear frame casting 29 and suitable set screws or other means (not shown) serve to fix the yoke member 228 to the rear furrow wheel spindle 32 in different vertical positions.

When the rear furrow wheel 35 is reversed, the gauge wheel 220 is also reversed from one side to the other so that in either position of plowing the gauge wheel 220 runs on the unplowed land.

While we have shown and described above the preferred structure in which the principles of the present invention have been incorporated, it is to be understood that our invention is not to be limited to the particular details shown and described above, but that, in fact, widely different means may be employed in the practice of the broader aspects of our invention.

What we claim, therefore, and desire to secure by Letters Patent is:

1. In a reversible disk plow, the improvement comprising a generally fore-and-aft extending frame having a transversely disposed supporting structure, a. beam pivotally connected with said frame for lateral swinging about a generally vertical axis located at a point spaced from said transverse structure, a supporting member pivotally connected with said frame for lateral swinging about a generally vertical axis spaced from said first mentioned axis, and said member being supported by said transversely disposed supporting structure, and a part slidably mounted on said member and supportingly connected with said beam.

2. In a reversible disk plow, the improvement comprising a generally fore-and-aft extending frame having a transversely disposed supporting structure, a beam pivotally connected with said frame for lateral swinging about a generally vertical axis located at a point spaced from said transverse structure, a supporting member pivotally connected with said frame for lateral swinging about a generally vertical axis spaced from said first mentioned axis, and said member being supported by said transversely disposed supporting structure, a plurality of disk standards rockably carried by said beam in a generally vertical position, furrow opening disks carried by the lower end of said standards, arms fixed to the upper ends of said standards, means interconnecting said arms to cause them to move together, and means connecting said supporting member with said arms for swinging the latter when said beam is swung between a right hand plowing position and a left hand plowing position, said means including a part slidably mounted on said member and supportingly connected with said beam.

3. In a reversible disk plow, a supporting frame having a transverse section adjacent one end, a swingable beam pivotally supported by a portion of said frame for movement relative thereto about a generally vertical axis, a supporting member carried at one end by said transverse section and pivoted at its other end to said frame at a point between said axis and said transverse section, a generally vertical disk standard connected with said swingable beam and shiftable relative to said beam for movement about a generally vertical axis, and means connected with said supporting member for shifting said disk standard when said beam is swung from one position to another.

4. In a reversible disk plow, a supporting frame having a transverse section adjacent its front end, a swingable beam pivotally supported adjacent its rear end by a portion of said frame for movement relative thereto about a generally vertical axis, a supporting member carried adja, cent its forward end by said transverse section and pivoted at its rear end to said frame at a point between said axis and said transverse section, a plurality of generally vertical disk standards rockably carried by said swingable beam, link means interconnecting said standards for causing them to rock together, and a part slidably associated with said supporting member and connected with said link means for rocking said disk standards when said beam is swung from one position to another.

5. In a reversible disk plow, a supporting frame, a swingable beam pivotally supported by said frame at a point thereon forward of the rear end thereof and swingable between right and left hand plowing positions, a plurality of oscillata ble disk standards rockably carried by said swingable beam, and means responsive to swinging of said beam to rock said standards, said last mentioned means including means connected between said frame and said beam for supporting the forward end of the latter.

6. In a reversible disk plow, the improvement comprising a generally fore-and-aft extending frame having a transversely disposed supporting structure, a pair of transverse vert-ically spaced apart bars, a beam pivotally connected with said frame for lateral swinging about a general-1y vertical axis located at a point spaced rearwardly from said transverse structure, a supporting member pivotal-ly connected with said frame for lateral swinging about a generally vertical axis spaced rearwardly of said transverse structure and forwardly of said first mentioned axis, the forward end of said pivoted supporting member being disposed between said transverse bars and supported thereby, a plurality of disk standards rockably carried by said beam in a generally vertical position, a part slidably mounted on said member and supportingly connected with said beam, said part moving angularly with said supporting member when the latter and said beam swing laterally relative to said frame, and standard-adjusting means connecting said part with said standards.

7. In a reversible disk plow, the improvement comprising a generally fore-and-aft extending frame having a transversely disposed supporting structure, a beam pivotally connected with said frame for lateral swinging about a generally vertical axis located at a point spaced from said transverse structure, a supporting member pivotally connected adjacent one end with said frame for lateral swinging about a generally vertical axis spaced from said first mentioned axis and supported adjacent its other end by said transverse structure, and a part slidably mounted on said supporting member and adapted to support the forward end of said beam.

8. In a reversible disk plow, a generally fore-and-aft extending main frame, a disk-carrying beam connected with said main frame for generally laterally swingable movement about a generally vertical axis disposed adjacent the rear end of said beam, a plurality of disks, means swingably connecting each disk with said beam for movement about a generally vertical axis, disk-swinging means connected to swing all of said disks simultaneously relative to said beam, a support bar pivoted adjacent its rear end to said main frame for movement relative thereto in a generally horizontal plane about a generally vertical axis disposed forwardly of said first-mentioned axis, means serving as a transverse bar carried by said main frame and slidably receiving and supporting the front end portion of said support bar, means carried on the front portion of said disk-carrying beam for slidably receiving the front portion of said support bar, whereby the latter supports the forward portion of said beam, and means connecting said disk-swinging means with said support bar whereby angular displacement of the latter incident to swinging of said beam swings said disks through an angle greater than the angle of displacement of said beam.

9. Ina reversible disk plow, the improvement comprising a generally fOTB-aHd-aft extending main frame, a rear furrow wheel swingable laterally between right and left hand plowing positions, a disk supporting beam swingable laterally between right and left hand plowing positions, an arm fixed to swing angularly with said beam and extending general-1y rearwardly, a bar pivoted at its forward portion to the rear portion of said arm, means connecting the rear portion of said bar with said rear furrow wheel, and means connected between said bar and said frame for imparting angular movement to said rear furrow wheel and said bar in excess of the angular movement of said beam and arm, said last mentioned means including pivotal link means.

10. In a reversible disk plow, the improvement comprising a generally fore-and-aft extending main frame, a rear furrow wheel swingable laterally between right and left hand plowing positions, a disk supporting beam swingable laterally between right and left hand plowing positions, a first arm fixed to swing angularly with said beam and extending generally rearwardly, a second arm pivoted to the rear end of said first arm and connected with said frame whereby when said beam is swung from one side to the other of the main frame said second arm is given an increased angular acceleration, a bar slidably connected with said second arm and having an end extending beyond the rear end of said second arm, and means connecting the rear end of said bar with said rear furrow wheel, whereby said rear furrow wheel is reversed by reversal of said beam.

11. In a reversible disk plow, a main frame, a beam swingable on the main frame from side to side, through a given angular extent, a hydraulic ram having one end connected with said beam to swing the latter, said ram having a normal extent of retracting and extending movement in excess of that required to shift said beam from one side to the other, and means anchoring the ram to said frame, including resilient means yieldable to accommodate said excess movement of said ram, said ramanchoring means including a bracket attachable to said main frame, a member slidable in said bracket and connected with one end of said ram, said resilient means including a pair of springs disposed on said member at each side of said bracket, and abutment means connecting said springs at their outer ends with said slidable member.

12. In a reversible disk plow, a main frame, a laterally swingable beam carried by said frame, one or more disks carried by said beam, said disk or disks rotating in one direction when the beam is swung into one position and in the opposite direction when the beam is swung into its other position, and scraper means for each disk, including a pair of pivoted scraper supports each swingable toward and away from the associated disk, a scraper blade carried by each scraper support, and means mounting one scraper support at one side of a vertical plane passing through the axis of the disk and separate means mounting the other scraper support at the other side of said plane.

13. In a reversible disk plow, a reversible disk-supporting member, a generally vertically disposed disk standard carried by said member, a rotatable disk carried by the lower portion of said standard, a pair of scraper brackets fixed to opposite sides of said standard, a pair of elements pivotally secured about a generally horizontal axis to said brackets, a pair of scraper blades pivotally carried by said elements respectively, one blade on each side of a vertical plane passing through the axis of said disk, and resilient means connected between each bracket and the associated blade for urging the lower portion of the latter against said disk, one blade performing the scraping action when the disk rotates in one direction and the other blade performing the scraping action when the disk rotates in the other direction.

14. In a reversible disk plow, a main frame, a rear furrow wheel spindle rotatable in a genera-11y vertical sleeve carried by said frame, a rear furrow wheel journaled on the lower end of said spindle, an arm fixed rigidly to said spindle above said furrow wheel and extending generally landwardly from the spindle, and a land wheel journaled on the outer end of said arm.

15. In a reversible disk plow, a main frame, a rear furrow wheel spindle rotatable in a generally vertical sleeve carried by said frame, a rear furrow wheel journaled on the lower end of said spindle, a land wheel support fixed rigidly to said spindle above said furrow wheel and extending generally landwardly from the spindle, said land wheel support including sections disposed above and below the sleeve carried by said main frame and substantially in contact therewith, and a land wheel journaled on the outer end of said land wheel support.

16. In a reversible disk plow, the improvement comprising a generally fore-and-aft extending main frame, a rear furrow wheel swingable laterally between right and left hand plowing positions, a disk supporting beam swingable laterally between right and left hand plowing positions, an arm fixed to swing angularly with said beam and extending generally rearwardly, a bar pivoted at its forward portion to the rear portion of said arm, means connecting the rear portion of said bar with said rear furrow wheel, and means connected between said bar and said frame for imparting angular movement to said bar in excess of the angular movement of said beam and arm, said last mentioned means including a link pivoted adjacent one end to said main frame at a point spaced from the axis of swinging of said beam, and means pivotally connecting said link adjacent its other end to said bar at a point spaced from the axis of pivotal connection of said bar with said arm.

References Cited in the file of this patent UNITED STATES PATENTS 793,715 Deere July 4, 1905 805,368 Lundin Nov. 21, 1905 2,546,554 McElroy Mar. 27, 1951 2,600,359 Coviello June 10, 1952 2,672,801 Barrett Mar. 23, 1954 2,675,749 Pursche Apr. 20, 1954 2,723,612 Morkoski Nov. 15, 1955 2,724,313 Jennings Nov. 22, 1955 2,732,781 Coviello Ian. 31, 1956 2,824,505 Coviello Feb. 25, 1958 2,900,033 Coviello Aug. 18, 1959 2,949,161 Campbell Aug. 16, 1960 FOREIGN PATENTS 18,947 Australia .t of 1934 168,023 Arustralia Aug. 14, 1956 802,368 Great Britain Oct. 1, 1958

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