US1160686A - Gang-plow. - Google Patents

Description

1. B. BARTHOLUMEW.

GANG PLOW. i APPLICATION FlLED lULY 2 1912.

` Patented Nov. 16, 1915.

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1. B. BARTHOLOMEW.

.GANG PLOW.

APPLICATION FILED IuLY 2. I9'I2.

Patented Nov. 16, 1915.

2 SHEETS-SHEET 2.

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JOHN B. BARTHGLOMEV, 0F PEOLRA, ILLINGIS, ASSIGNOR TO AVERY COMPANY, OF PEOPLI., LLINOS, A CORPORATION 0F ILLINOIS.

GANG -PLV @riginal application filed November 29, i910, Serial No. 594,727.

Serial No. 707,255.

paratus comprises an engine or tractor, and

a` draft frame trailing behind it andflexibly connected thereto, this frame being so mounted and supported in relation to the ground surface that the plowbeam-attaching points will be held in substantially fixed positions in relation to tie ground surface when the apparatus is at work. Each plow unit is secured to the draft frame in such way that the important parts of the unit, such as the body and the beam, will be so held at all times that they can vibrate vertically in arcs which are fixed in relation to the connecting points on the frame. 'lhe plowing mechanisms of the class referred to are in contradistinction to those of the class in which there were several points of flexible union between the beam and theframe;

,here always being an overhanging supportv connected to the unit at a point near the plow body, and intended to lift or lower the body, and there generally being also a link system interposed between the front end of ,the beam proper and the draft frame, the

link or links beingconnected to the front end of the beams by one set of pivot devices, and the front end of the link or links being connected by another set of pivot devices, the front endr of the beam proper being allowed to move vertically bodily in relation to the frame and sometimes to move laterally.

ln a plow of the sortto which the present invention relates, the plow unit comprises a beam which, when at work. is rigid in relation to the plow body, and is secured to the draft frame by a device furnishing` a single pivot abutment around which the beam and the body swing vertically, as aforesaid. in fixed ares, and the supiiorting of the body at any one of its several working lines (optionally predetermined) and its lifting verilcally to points Aabove the ground are ac- Specication of Letters Patent..

Patented liloun i6, illld.

Divided and this application filed July 2,

complished by meansI of a wheel connected to the beam and located relatively7 near the body whereby it is adapted to take the down pressure from the suction of the body when at work and from its gravity when it is ele- `vated for transportation.

T he object of the invention is to provide in a plow of the class set forth means whereby the plowing unit can be lifted in a xed arc about the aforesaid single/pivot abutment by means of power transmitted'direetly from a ground wheel and applied to effect relative movement between the vunit and the ground wheel thereof.

This application constitutes a division of my co-pending application for gang plows` Serial No. 594,741, filed November 29, 1910;

The form of my invention which l prefer as now advised is shown in the accompanying drawings in which,

Figure l is a plan view of a gang plow and the rear end of a tractor to which the plow is connected by draft devices; Fig. 2 is a left side elevation of the same with the exception that only one of the individual plows is shown, the others being omitted to avoid confusion; Fig. 3 is a view similar to Fig. 2, but with the plow raised from the ground; Fig. et is a rear elevation of the clutch mechanism which constitutes a part of the power lifting device; Fig. 5 is a ver tical section on the line of lFig. il; Fig. 6 is a diagrammatic side view of the lifting cams showing their spaced relation to each other; Fig. 7 is a detail view of the upper part of the shank of one of the individual plows.

Referring in detail to the construction illustrated, l designates the main frame of the plow as an entirety. Ilhis frame is roughly triangular in. outline and consists of a side bar 2 having an oblique forward extension 2, an obliquely disposed bar 3 which is connected by a block l with the oblique bar 2, and an obliquely disposed bar 5 extending from the rear end of the side bar forward to the oblique bai-'3. ri brace bar (l extends from the left forward corner of the frame to the oblique bar 5. All of the frame bars are rigidly connected as by rivets or bolts. The frame is supported from the ground by wheels there being a front wheel i' mounted on a` swinging yoke or carrier said carrier having at its front end a vertical trunnion -9 :mounted in the block 4 of the frame. 1n addition there are wheels and l1 mounted upon a transverse axle 12 which is mounted at one end in a bearing bracket 13 on the frame bar 2 and at its other end in a bearing` bracket 14 which is carried by a rearward extension -of the frame bar 3.'

In the present construction 1 have shown a gang, made up of four individual pows or plowing units 15, 16, 17, and '18. ach of these units preferably consists of a beam or a hole through which is passed' one of the able with respect to the unit.

'securingbolts 24, a slot 25 through whichv the other securing bolt 26 passes.

27 is a spring clip which has a sliding en- ,sagement with a shoulder 22S/formed on the front of the plow shank and which is held 'in positionbya stud bolt 29 and a. coiled spring; 30 interposed between the head of said bolt and the clip. The upper end of the-clip is formed with` a hook 30a which overlies a crossV bolt 31 carried by the plow beam bars 19,20.' The spring pressed clip serves to holdthe plow body in itsnormal upright position when the resistance ,to the advance of the plow is normal, but when an obstruction such as a rock or the like is struck the abnormal resistance causes the spring clip to give way and permits the plowlbodyv to swing, downward and rearward about the securing bolt 24. The front ends of'the beam bars 19 and 2O are preferably spaced apart as shown in Fig. 1, and

pivotallysecured to a rod. or pin S2 which is `carried by brackets 33, 34:, which in turn are secured to a bar 3 5 `which is bent as shown to'form offsets to receive said brackets. rlhe individual plow thus connected to the main frame is 4free to swing vertically but is held against swinging laterally and against tipping or winging.

Each plow unitis provided with a gage and lifting wheel 36 which is vertically mov- In order to permit vertical movement or adjustment,

eachwheel is mounted .upon a standard 37 which .is arranged tol slide. vertically in bracket 38 carried by the beam bar 19.

Suitable devicesvare provided on the beam Vand connected with the wheel for moving the wheel relatively to the beam and therebyJ- lifting'theunit as a whole upon the wheel'fas'a'support. Of the mechanism shown 39 is a bell crank or lever fulcrumed at 4Q on -a bracket 41 and connected at its forward 'end bya link 42 to the standard 37. A hand screw 43 is mounted in' the rear end of theA lever 39vs0 as to bear upon one of the beam bars of the plow. ,The lever 39 carries an upright extension 39 to which is adjustably connected a link '-'lal that extends forward to actuating devices which are presently to be described.

L15 is a coil spring which is secured at one end to the lever extension 39a and at its other end to one ofthe plow beam portions.

Whenthe front end of the lever 3f) is raised throwing the wheel 36 to its uppermost position, which position is determined by the Contact of the screw 13 with the plow beam said wheel serves as a gage wheel. By throwing the `front end of' the lever 39 downward it will be seen that the wheel 39 is forced downward relative to the plow beam, or to speak more accurately, the plow beam is raised relatively to the wheel and as the wheel rests upon the ground the plow body is thus lifted from the soil.

Each of the individual plows are con structed and arranged as has been described and to provide for the lifting oi? the plows in succession 1 provide a suitable power mechanism which, in the preferred i'orin, is actuated by Irround wheel traction. The mechanism which 1 have shown and which 1 prefer is connected to transmit the power of the main trame ground wheels to the lever 39; but it will be understood that as concerns this feature of my invention there can be variation. As shown a short transverse shaft 46 is mounted in bearing brackets or standards i7 and 48, these brackets being carried by the trame bars 2 and 5 respectively. On this shaft 46 is mounted a clutch mechanism which comprises parts as follows: 49 is a sproclut wheel which is rigid with a serrated wheel 50, the two turningV loosely on the sha lt 46. Adjacent thel wheel 5() is a disk 5l which is keyed to the shaft 4.6, and is a pawl or dog which is pivoted at 53 to theI disk This dog carries at one end a roller 511' which is adapted to be swung,y into engagement with the teeth oi the serrated wheel 50. On the other end of .the dog 52 is formed a shoulder 52a having a, function which will presently be stated. 55 is a spring` interposed between an abutment on the disk 51 and the dog said spring tending to swing the roller z into engagement with the teeth of the wheel 50.

The bearing standard 118 carries a pivot pin 56 upon which is mounted a lever 57, the said lever being?r thus disposed adjacent the disk 51 and movable in fixed relation to the draft frame. The lower end of the lever carries a laterally extending lugr 58 which extends across the plane of the disk 51 into the plane of the dog The lower end of the lever 57 is notched to receive the end of a spring, 59, the other end of which is adjustably secured to a lug 48 on the standard 48. The spring 59 draws the lower arm of the lever 57 toward the shaft 46 and presses lue Liconsa 51. Normally the lug 58 lies in a notch 51a .formed in the disk 51. The lever 57 has an upward extension 60 to which is connected a cord 61 which can be extended forward to a point where it may conveniently be grasped by a person on the tractor. On the axle 12 directly beneath the sprocket wheel 49 is secured a sprocket wheel 62 and this is connected by means of a sprocket chain 63 to the wheel 49 so that the latter is constantly driven when the axle is turning. The parts are normally in the position shown in Fig. 5, the lug 58 being in engagement with the dog 52 and serving to press said dog against the action of the spring 55 into the position shown so that the roller 54 is entirely out of engagement with the serrated wheel 50. lff now the cord 61 is pulled forward the lower arm of the lever 57 is swung rearwardly so as to raise the lug 58 out of the notch 51a and out of engagement with the dog 52. The dog 52 when freed from the pressure of the lug 58 is swung by the spring 55 to bring the roller 54 into engagement with the serrated wheel 50. rlhe rotation of the latter wheel is then transmitted through the dog 52 to the disk 51 thus causing said disk to turn with the shaft. The pull on the cord having been relieved after the engagement of the clutch, the lower end of lever 57 is again swung forward under the action of the spring 59 so that the lug 58 rides upon the edges of the disk 51 as the latter rotates. s the revolution of the disk 51 nears its end, the shoulder extension 52 of the dog 52 engages the lug 58 so that the dog begins to swing upon its pivot 53 and thenas the notch 51 of the disk 51 comes opposite the lug 58 the latter is snapped forward, thus causing the dog to be swung to its initial position with the roller 54 entirely out ofaengagement with the' serrated wheel 50. ln this manner the movement of the disk 51 and therefore of the shaft 46 is stopped precisely at the end of a single revolution.

' 64 is a sprocket wheel keyed or otherwise rigidly secured to the shaft 46 and this wheel is connected by meansof a sprocket chain G5 to a sprocket wheel GG which is fast on a transverse shaft 67, this shaft being rotatably supported in bearing standards 68, 69. In the construction shown the diam eter of the sprocket wheel 64 is one half that of the wheel 6G and it will be seen therefore that when the shaft 46 is given a single revolution by the action of the clutch mechanisln which has been described, the shaft 67 'n ill be given a half revolution.

0n the shaft 67 is mounted a series of cams 70, 71, 72 and 73, one of said cams being disposed approximately in line with each of the individual plows. Adjacent each cam. is arranged a lever arm 74 which is pivoted at its lower end to a bracket 7 5 on the main frame. This lever is adjustably connected at its upper end to the front end of the link or rod tl which at its other end is connected to the plow lifting lever 39. Each of the lever arms 74 carries a roller 7G in a position to bear upon the adjacent cani.

Each of the cams referred to is formed on its forward edge or side with an outwardly and rearwardly curving surface 77 which I shall refer to as the active surface. This surface merges with a neutral circular or cylindrical surface 78, and the rear edge of the cam is substantially radial. All of the cams are formed alike but they are spaced angularly from each other as shown in Fig. the cam which is associated with the forward plow 18 being farthest ahead. The spacing of the cams is determined by the distance one plow is in advance of another and by the diameter of the wheels 10, 11, and the ratios of the gears between the wheel axle 12 and the shaft (3, the spacing being such that the several cams come into action one after another so that the plows are lifted from the ground at points in the same transverse line. It will be seen that when the shaft 67 is rotated the active parts 77 of the cams press against the rollers 7G and cause the lever 71 to swing forvv ard and thus the lifting levers 3S) are swung so as to lift the individual plows on their respective gage wheels 36. As the rollers 76 one after another ride outward on the active faces 77 of their respective cams they pass upon the neutral cylindrical surfaces 78 of said cams and are thus automatically held forward so as to hold the ph ws in their elevated positions. ll'n other words the actuating devices for the plow lifting means are non-overhauling7 when said devices have been moved into their positions corresponding to the elevated postions of theplows. Furthermore, the length and relative angular arrangement of the cylindrical surfaces 78 of each of the cams is such that at the end of a half revolution of the shaft 67 the several rollers 76 rest upon the intermedia-te points of the said cylindrical surfaces 78 of the respective cams with said surfaces extending a substantial distance on either side of the rollers 78; so there is no precise point or dead center at which the cam shaft must be stopped in order to set-ure the automatic locking action of the actuating devices.

To lower the plows it is only necessary to trip the clutch mechanism thus causing one revolution of the shaftati and a half revolution of the shaft G7. During this half revolution of the shaft G7 the neutral faces 78 of the cams are moved one after another, beginning with the cam 70, past their respective rollers 7G, thus allowing one after another of the levers 74 to swing rearward under the action of the weight 0f the plOwS the springs 45.

In the drawings I have indicated diagrammatically the rear end of a tractor having wheels 80, 80, mounted on an axle 8l,

and having a body or framework 82. The

plow frame can be connected to the ltractor in any suitable manner, but I prefer to employ crossed chains 83, 83, arranged as shown in Figs. l and 2.

rlhe operation or handling of the plow will be readily understood from the description which I have given. end ofu the furrows the engineer or driver of the tractor has only to pull forward on the cord 61 so as to trip the clutch mechanism whereupon the 'cam shaft 67 is given a half revolution vduring which the cams are swung forward so as to lift the plows from the ground one afteranother in the manner described and to sustain them in their elevated positions. The machine having been turned the driver can again lower the plows one after the other by simply pulling on the cord 6l as before, thus again tripping the clutch mechanism and causing a second half' revolution of the camshaft G7 during which the plows are again lowered in succession. By adjusting the connections of the links lf-l to the lever arms 74e and 39a the height to which the plows are lifted can be varied within certain limits. And by adjusting the hand screw 43 the depth of the cut can be varied as has been explained.

It will be seen that the mechanism which I provide embodies more than the mere conception, more or less vaguely entertained, of employing power devices for lifting the plows instead of manually operated devices. I provide means to prevent the movement of the plow body below a certain predetermined depth, that is, prevent its bottom working line from being more than a predetermined distance below the ground contacting line of the wheel 36 and yet permit the power devices, at any instant, to imme iately press downward the wheel 36, or, in other words, to raise the plow body in relation `to that wheel, it being understood tliat the vertical movements of these two parts, the wheel and the body, are relative, and ytherefore the wheel can be described as moving downward in relation to the body, or the body as moving upward in relation to the wheel. In manually actuated or hand-lever mechanisms, the wheel and the body requirev a lock supplemental to the hand lever proper, which lock will prevent relative movement of either the wheel in both directions or of thebody in both directions. ln my construction there is a lock or Arriving at the insonne stop'acting in one direction only, that is lo uy, acting to prevent the body from descending below 'a predetermined line, or to prevent the wheel from relatively rising above a predetermined line, while the, body is at the same time free to move in one direction and thewheels :free to move in another direction, and because of this the power mechanism is free to :nitonratically press the wheel downward or lift the body upward. And the final abutment or tln'if. point around which these relative moyen c place is the abutment provided by fixed hinge uniting the beam to frame. rIhc train of power transn vices is so arranged that their extreu t l antw. of action or eficiency are at a prodcor .nu Y but fixed, distance; for example, from 'ine roller 76 the distance through the lover i' "pho link -l-l, the arm 39 and the lever 3S) to citi the axis at 4i() of the latter lever or the thrust point at ft2, is a ixod distance (after the parts have been adjusted and set) at all times, and therefore the lifting action ,in the plow unit is always the saine, and the ph v body will always be lifted, at any liftin ,elevated to a higher or a lower point (who it is at its highest elevation) as may be dosired; such adj nstment being allowed by the row of pivot receiving apertures in the har or lever Tlf for connecting thereto the link ell. lllhen the link is cbnnected to the lever at points relatively distant from the pivotal coin'iection at 75, the rod l-l and the lever Flr) will be drawn backward farther and 1the plow body will be lifted higher upon the wheel, and vire versa. Where the. apparatus is being transported over an uneven or broken surface, it is necessary to lift [he bodies to higher points in order to havel them always clear the ground. llhcrc, howevcl', it is possible to carry tht-ni with the plow points nearer to the surface, it is pre l'- erable to shorten the vertical distance of the lift so that they will ride more steadily. Again, I provide means vfor varying (he relations of tln` parts in such way that when it is necessary more power can be exerted by the lever 35) in lifting the body. rlhe link or chain all can be connected to the lever -ltl at various radial distances. lllhen they aro connected at a longer radial distance thc motion of the lever 3S) at each lifting art-ion will be slightly slower than when the conu nection is made at a shorter radial distance, but there will be a corresjmnding increase in i power, a matter becoming necessary where insonne heavy soil or tough sod lies above and is pressing down upon the plow body, requiring that the hard soil shall be broken or the sod layer torn loose before the body can escape above the surface.

The connecting devices between the lever` 'Tet on the main frame and the lever 39 on the beam can be so connected as to provide some looseness. Such an adjustment; is indicated in Figs. 2 and 3 where the linlr delis shown as being pivoted to the lever 74; at the intermediate pivot hole in the lever. This looseness is found sufficient on the one hand to permit the beam to move downward to some extent below its predetermined normal horizontal plane without causing such tension on the lever 39 as to press the wheel 36 down to any material extent, and on.' the other hand, slack or looseness is not sulficiently great to -prevent the power devices from practically immediately exerting tension through the transmitting train to effect an instant pick up of the beam and body on the wheel. A sufficient variation, as required by circumstances, can be insured in this respect bythe provision made for varying the point of attachment of the draft train to the lever 39. By ascertaining the proper amount of lost motion and slackness in a draft train such as that herein shown Iand then attaching the united parts of the train at the proper points a sufliciently wide range in the vertical movements of the plow beams can be provided for, .particularly where the land is approximately level throughout to avoid the lifting of the body out ofthe ground by pressure on the wheel, whether the beam descends to a limited extent from or lies above its normal plane.

TyWhat l claim is:

l. The combination of a draft frame detachably and flexibly connectible with a tractor, ground wheels upon which the frame is supported, a trailing plowing unit having at its front end a vertically fixed transverse horizontal pivotal connection with the frame, a vertically adjustable ground wheel normally carrying the unit in fixed relation. to the ground, and a ground .wheel actuated power transmitting train connected to move the adjustable ground wheel downward with respect to the unit and thereby lift the unit, the said train having all of its parts connected and mounted in definite predetermined relationship to the draft frame and the unit, whereby the lifting of the unit is definitely and fixedly related to the rotation of the actuating ground wheel.

2. The combination of a draft frame detachably and flexibly' connectible with al tractor, ground wheels upon which the frameis supported, a trailing plowing unit having at its front end a vertically fixed transverse horizontal pivotal connection with the frame, a vertically adjustable ground wheel normally carrying the unit in, fixed relation to the ground, and a ground wheel actuated power transmitting train connected to move the adjustable ground wheel downward with respect to the unit and thereby lift the unit, the said train having all of its parts connected and mounted in definite predetermined relationship to the draft frame and the unit, whereby the lifting of the unit is definitely and fixedly related to the rotation of the actuating ground wheel, and the said' train comprising a clutch having means for automatically disengaging it after the lifting of the unit.

3. The combination of a draft frame detachably and flexibly connectible with a tractor, ground wheels upon which the frame is supported, a trailing plowing unit having at its front end a vertically fixed transverse horizontal pivotal connection with the frame,- a vertioallv adjustable ground wheel normally carrying the unit vin fixed relation to the ground, and a power transmitting train actuated byy a ground wheel of the draft frame and connected with the adjustable ground wheel to move it downward with respect to the unit and thereby lift the unit, the said train having all .of its parts-connected and mounted in definite predetermined relation- Ship to the draft frame and the unit, Whereby the lifting ofthe unit is definitely and fixedly related to the rotation of the said draft frame ground wheel.

4:. The combination of a draft frame detachably and Hexibly connectible with a tractor, ground w ieels upon which the frame is supported, a trailing plowing unit having at its front end a vertically fixed tranverse horizontal pivotal connection with the frame, a vertically adjustable ground wheel normally carrying the unit `in fixed relation to the ground, and a power transmitting train actuated by a ground wheel of the draft frame and connected with the adjustable ground wheel to move it downward' with respect to the unit and thereby lift the unit, the said train having all of its parts connected and mounted in definite predetermined. relationship to the draft frame and the unit, whereby the lifting of the unit is definitely and lixedly related to the rotation of the said draft frame grounyd wheel, and the said train comprising a clutch having means for automatically disengaging it after the liftin of the unit.

5. The combination of a draft frame detachably and flexibly connectible with a. tractor, ground wheels upon which the frame is supported, a trailing plowing unit-having at its front end a vertically fixed transverse horizontal pivotal connection with the frame, a vertically adjustable ground wheeln normally carrying the unit in fixed relation to the ground, and a ground wheel actuated power transmitting train connected to move the adjustable ground wheei downward with respect to the unit and thereby lift the unit, the said train having all of its parts connect- A ed and mounted in definite predetermined relationship to the draft frame and the unit, whereby the lifting of the unit is definitely and fixedly related to the rotation of the-actuating ground wheel, and the said train being optionally adjustable to vary the extent of movement of the adjustable wheel with respect to the unit.

t6.'Tl1e combination of a draft frame-detacha bly and flexibly connectible with a tractor, ground wheels upon which the frame is supported, a trailing plowing unit having its front end a vertically fixed trans-- verse horizontal pivotal connection with the frame, a vertically adjustable ground wheel normally carrying t-he unit in fixed relation Vto the ground, the said ground wheel being freely movable downward with respect to the unit upon the application of power, an adjustable stop for'limiting the movement of the ground wheel'u ward with respect to the unit to determine tiie depth of plowing, and a ground wheel actuated power transmittin a train connected to movev the adjustable ground wheel downward with respect to the unit and thereby lift the unit, the said train having all of its parts connected and mounted in definite predetermined relationship to the draft frame and the unit, whereby the lifting of the unit is definitely and ixedly related to the rotation of the actuating ground wheel.

7. The combination of a draft frame detachably and flexibly connected with a trac-v tor, ground wheels upon which the frame is supported, a trailing plowing unit having at its front end a vertically fixed transverse horizontal pivotal connection with the frame, a vertically adjustable ground wheel normally carrying the unit in fixed relation to the ground, the said ground Wheel being freely movable downward with respect to the unit upon the application of power, an adjustable stop for limiting the movement of the ground wheel upward with respect to the 'unit to determine the depth of plowing, and a ground wheel actuated power transmitting train connected to move the adjustable ground wheel downward with respect to the unit and thereby lift the unit, the said train having all of its parts connected and mounted in definite predetermined re! 'lationship to the draft frame and the unit, whereby the lifting of the unit is definitely and fixedly related to the rotation of the actuating ground wheel, and the said train being optionally adjustable to vary the extent of movement of the adjustable wheel with respect to the unit. i

8. The combination of a draft frame detachably and flexibly connectible with a tractor, ground wheels upon which the frame is supported, a trailing plowing unit having at its front end a vertically fixed transverse horizontal pivotal connection with the frame, a vertically adjustable ground wheel normally carrying the unit in fixed relation to the ground, and a power transmitting train connecting a ground wheel of the draft frame with the said adjustable ground wheel and comprising an element mounted on the draft frame and movable in fixed relation thereto, the said train serving to move the adjustable ground wlieels downward with respect to the unit to li t it.

9. The combination of a draft frame detachably and flexibly connectible with a tractor, ground wheelsiupon which the frame is supported, a trailing plowing unit having at its front end a vertlcally fixed transverse horizontal pivotal connection with the frame, a vertically adjustable ground wheel normally carrying the unit in fixed relation to the ground, and a power transmitting train connecting a ground wheel of the draft Iframe with the said adjustable ground wheel and comprisirg an element mounted on the draft frame and movable in fixed relation thereto and also comprising devices between the said frame mounted element and the said adjustable ground wheel which have one of their points of connection adjustable, the said train serving to lift the unit by moving the adjustable ground wheel downward with respect thereto through one distance or another according to the adjustment of the aforesaid point of connection.

10. The combination of a draft frame detachably and. flexibly connectible with a tractor, ground wheels upon which the frame is entirely supported, a trailing plowing unit having at its front end a vertically fixed transverse horizontal pivotal connection with the frame, a vertically adjustable ground wheel normally carrying the unit in fixed relation to the ground, the said ground wheel being freely movable downward with respect to the unit upon the application of power, anl adjustable stop for limiting the movement of the ground wheel upward with respect to the unit to determine the depth of plowing, and a power transmitting train connecting the ground wheels of the draft frame with the said adjustable ground wheel to move the latter downward with respect to the unit thereby lifting thek said unit and comprising an element mounted on the draft frame and movable in fixed relation relatively thereto.

11'. The combination with the plow frame adapted to be fiexibly connected to a tractor, of a plow unit having a beam hinged to the frame, a plow body vibiating vertically in fixed arcs, a body supporting wheel fixed against movement in one direction with ref spect to the body but freely movable rela` per ada-pied to be llexibly connected lo a tractor,

of a plow unilJ having beam hinged to the frame, plow body vibrating vertically in fixed arcs, a body supporting ground wheel movable freely downward relatively 'to the wopar power transmitter having .one its paris movably mounted on the beam and pivoially connected lio she wheel and having other parl? niovably mounted on the blow :ii'enie and connected with the parl; on lille beam, a power shairon the plow raniefor actiiaiing the said Second part of the transmitter, and e traction wheel-on the plowfranie l'lor actuating; lplie said shaft.

w' The combination with the plow 'frame le). adagterl lo be liexibly conneeted to a tractor, of a plow unit having a beam hinged to the frame, a plow body vibrating vertically in fixed eres, a sripporling wheel movable f freely downward relatively to the body, a

lever rounled on the beam and pivotally Conner.u d to the wheel, an adjustable atop for lirniiing; ille motion of the lever inthe direcion oppoeite to abat necessary to lift the plow power devices on the plow ranie inoerniittingly connected operalzively with the said lever.

le. The combination with the plow frame adaped to be Hexibly connected to a tractor, oi' the plow unit having a beam hinged to the frame, a plow body vibrating vertically in 'fixed arcs, a body supporting wheel carried by che beam and freely movable relaiively to the body in one direction, a stop 'for limiting` the movement 'of the wheel in the opposile direction, a power transmitter on lle plow frame, a power transmitter on the beam pivot-ally connected to the wheel, a

connecting device between the said powerl tranemit-ters, a. power mechanism on the plow frame interiniti'ingly connected operatively with the second aforesaid transmit-ter, and a traction wheel on the plo-w frame for actin ating the power mechanism.

l5. The combination of a plow frame nioinited in substanlially fixed relationship to the ground and adapted to be flexibly connected io a tractor, a plow beam connected to the frame for movement abone a fixed transverse-axis, the blow body on the beam, a vertically movable ground-engaging wheel adjacent the body, e lever pivoted on vthe beam and pivotally connected with the ground wheel, a power mechanism on the plow frame, power transmitting devices connected -'co the power mechanisi'n and adjustably connected to the said lever, and means lior varying the movement of the lever relative to che beam.

ln testimony whereof, alllx my signature,

lin presence of two witnesses.

JOHN B. BARTHULOlll'EVV.

A. L. GREGORY.

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