USRE22019E - Controlling mechanism fob agricul - Google Patents

Description

T. BROWN Feb. 10, 1942.

CONTROLLING MECHANISM FOR AGRICULTURAL mrmunu'rs Original Filed Sept. 30. .1939 4 Sheets-Sheet 1 regardless of movement of both Reiasued Feb. 10, 1942 CONTROLLING MECHANISM FOR AGRICUL- TUBA!- IMPLEMENTS Theophilus Brown, Moline,

. 8: Company, Mollne, 111.,

Illinois Original No. 2,249,807,

for reissue September 26, 1941,

56 Claims.

The present invention relates generally to agricultural implements and more particularly to tractor mounted tools of the ground working type such .as plows, listers and the like. More particularly, the present invention is concerned with agricultural machines in which the depth of operation of the tool or tools is controlled by a gauge wheel and in which the tractor is provided with power lift mechanism for raising the tools into transport position.

The object and general natureof this invention is the provision of means controlled by the tractor power lift mechanism for controlling the working depth of the tool. Heretofore, so far as I am aware, the tractor power lift mechanism has been employed solely to raise the tool into transport position or lower it into working position. A feature of this invention-is the provision of an agricultural machine having power lift mechanism so connected with the implement gauging means that the first or initial range of raising movement serves to raise the tool or tools relative 'to the gauge wheel while the remaining raising movement of the power lift mechanism serves to raise or lift both the tool and the gauging means out of contact with the ground. More spe- IlL, assignor to Deere a corporation of dated July 22, 1941, Serial No. 297,330, September 30, 1939. Application Serial No.

cifically, the present inventionhas for its object the provision of means for controlling the depth of implement tool means by means of a power lift mechanism of the double acting hydraulic type which can be moved to and locked in any intermediate position as well as in a completely raised orcompletely lowered position, and in this connection it is a further feature of the present invention to employ a .hydraulic double acting power lift so that the'lower part of the lift is used to 'control the depth while the upper part of the lift is utilized for raising the implement into its transport position.

Another feature of the present invention is the provision of means for controlling the depth of an integral implement. such as a plow, by means of the tractor power lift mechanism"which is connectedto a gauge wheel or other unit arranged to follow the ground independently of the tractor and operatively connected therewith so that the power lift connections maintain the plow beam and gauge wheel in the desired adjusted relation, the gauge wheel and the tool beam relative to the tractor. Hence,

while the power lift mechanism on the tractor is operatively connected. first, to position the gauge wheel relative to the tool means to determine the depth of operation thereof and, second to raise both the tool means and the gauge wheel of! the downward movement relative to the the gauging means thereof ground, yet the gauge wheel in normal working position remains in adjusted relation with respect to the tool means and can follow inequalities of the ground traversed with the consequence that the depth of plowing remains uniform. So far as I am aware, it is broadly new to provide an implement of this kind which is gauged, no from the tractor, but from the ground surface, yet has its depth of operation controlled by mech-' anism on the tractor, which mechanism is also arranged to raise the unit into its transport position.

One specific feature of the present invention resides in the provision of a single member on the tractor operatively connected through a first linkage for adjusting thedepth of operation and then operative through a related linkage to raise the tool into transport position, each linkage so constructed and arranged that each is permitted to perform its prescribed function, without interference from the other. In other words, the power lift connections are so arranged that during the depth adjusting range the gauge wheel is moved downwardly relative to the tool beam and in the lifting range of the tool beam is raised but the gauge wheel is prevented from further tool beam,to

any material extent.

Another important feature of the present invention is the provision of means associated with a hydraulic lift mechanism for automatically returning the implement to a given operating depth, which can be adjusted, after the implement and has been raised into lifted or transport position. Briefly, according to the present invention, such means includes an operating membe for the hydraulic power lift valve, with a. part mounted for adjustment thereon and operatively connected with the lowerin mechanism whereby when the plow or other tool has been lowered to a given point relative to the gauge wheel, the hydraulic power lift controlling valve is automatically returned to a position locking the hydraulic mechanism against further movement.

. These andother objects and advantages of the present invention will Figure 1 is a perspective view of the rear end of a tractor having a hydraulic lift of the double acting locking type and serving as the propelling the following the latter and the unit for a plow of the integral type having an adjustable gauge wheel which is operatively connected with the tractor power lift mechanism so that the latter may be utilized for gauging the depth of operation of the tool and also raising gauge wheel into transport position;

Figure 2 is a side view of the machine shown in Figure 1, the plow being illustrated in a deep plowing position;

Figure 3 is a view similar to Figure 2, showing the plow in shallow plowing position, Figures 2 and 3 showing the amount of movement of the power lift mechanism utilized for the depth controlling operation;

Figure 4 is a view similar to Figures 2 and 3, showing the parts in their relative positions they occupy when the plow is'raised into its transport position;

Figure 5 is a fragmentary side tiew, showing the position of the depth controlling levers for shallow plowing but with the unit in its raised or transport position Figure 6 illustrates the application of the principla of thepresent' invention to a single bottom lister mounted on a tractor having a power lift of thehydraulic double acting locking type arranged to control the depth of operation and to raise the lister bottom and the gauging means simultaneously into transport position;

Figure 7 is a view similar to Figures, showing the parts in the positions they occupy when the lister is in a shallow plowing position;

Figure 8 shows the occupy when the unit is raised into transport position:

Figure 9 is a side view of a cultivating implement in which the principles of the present invention have been incorporated;

, Figure 10 is a view of the implement shown in Figure 9, with the tools disposed in their shallow orking position and with the power lift unit in a position to start raising both the tool means and the gauge wheel relative to the tractor;

Figure 11 shows the tool means and gauge wheel in their raised or transport position; and

Figure 12 is a fragmentary section taken on the line |2|2 of Figure 9.

ically actuating the valve into either of its fully raised or fully lowered positions has been omitted and the valve means arranged so that it may be moved into an intermediate position, locking the piston in any position in its cylinder against movement in a downward direction, along the lines of the hydraulic power lift shown in the patent to Harold Brown, No. 1,929,804, issued October 10, 1933. Obviously, of course, any other suitable form of power lift mechanism,'either doubleor single-acting, may be employed in the present invention, so long as such mechanism is of the type which may be raised or'lowered, as desired, or held in any intermediate position, in any suitable manner as by moving a valve lever, such as l2, from a neutral or locked position into either of two operative positions.

The integral implement chosen to illustrate the principles of the present invention embodies a plow including by hitch means 22 to the forward portion of the tractor and carrying at its rear end a plow bottom 23. According to the principles of the present invention the depth of operation of, the

parts in the positions they 7 Referring now to the drawings, more particularly to Figures 1-5, inclusive, the tractor which serves as an implement or supporting frame is indicated in its entirety by the reference numeral I and includes a frame 2, a motor 3 and a rear axle structure I, the latter includingaxle shafts 5 and 5 upon which the rear traction wheels I of the tractor are mounted. In Figure 1, the near rear wheel is removed so as to show the power lift connections. The power lift of the tractor is indicated generally by the reference numeral l0 and is of the hydraulic type which includes a rock shaft actuated by suitable hydraulic mechanism under the control of suitable valve means having a valve actuating arm I 2. Preferably, the hydraulic mechanism includes a pump drivenfrom the tractor motor, a double acting cylinder and piston arrangement for rocking the shaft II from one position to the other underthe control of the valve means at l2. The power lift mechanism indicated at I0 may take the general form of the power lift mechanism disclosed in ,my prior Patent 2,197,848, dated April 23, 1940, and this is the general form of hydraulic lift mechanism shown by way of illustration in the drawings, with the exception that the feature of automatplow bottom 23 is controlled by a gauge wheel 25 journaled for rotation on the rear end of a swinging link 26, the laterally directed forward end 21 of which is mounted for general vertical rocking movement and generally lateral shifting movement in a pair of vertical standards 28 and 29 which are connected in any suitable manner to a pair of brackets 3| and 32 secured, as at 33, to the rear axle of the tractor, preferably to the under side of the enlarged central portion of the rear axle housing 4. By virtue of this construction the gauge wheel 25 is attached to the tractor yet can follow variations of the ground surface independent of the tractor. Also, when the plow beam swings laterally, a small amount of which is permitted by the draft connections 22, the gauge. wheel 25 follows the plow beam since the end 21 can shift'laterally in the standards 23 and 29.

The position of the gauge wheel 25 relative to the p is controlled by connections therebetween which include a pair of toggle links or arms 35 and 35. The link or arm 351s pivoted to the beam 2| by a bolt the lower link or arm 35 is pivoted to the swinging link or crank axle 25 by means of a bolt or other means '39, preferably arranged on the axis of rotation of the gauge wheel 25. The two arms or links 35 and nected by means of a pin or other mean 4|, as best indicated in Figures 2 and 3. When the toggle arms or links 35 and 36 are-moved into collapsed position (Figure 2) the gauge wheel 25 is nearest the plow beam 2|, and hence the plow bottom 23is arranged for deep plowing. When the toggle arms or links 35 and 36 are extended (Figure 3) the gauge wheel 25 is farthest from the plow beam 2| and hence the plow bottom 23 is arranged for shallow plowing.

the. power lift mechanism I0, and is provided with three arm sections 5|, power lift arm 5| is connected by means of a link 54 to a bell crank 55 which consists of an arm a plow beam 2| connected or other means 31, and,

36 are pivotally intercon- 58 rigidly connected to a second arm 51, both being carried .on a transverse shaft 52 which is supported at its opposite ends in the upper ends of the vertical standards 28 and 29. The connecting link is pivotally connected at its ends, asat 5| and 52, to the power lift arm II and the upperendofthebellcrankarm". ThelowerendofthebellcrankarmlLshownatllainFlgure 1, plvotally receives the forward end of a link II, the rear end of which is connected by the pivotpin 4| tothetogglelinksor arms 35 and. It will be observed that the lower end 510 of the bell crank arm 51 is disposed closely adjacent the axis of theswinging crank axle section 21 for a purpose that will be explained below. As will be clear from Figure 1,- when the power lift mechanism Ills actuatedtoswingthearm 5| inone direction or the other, a thrust or a pull is trans-- mitted through the link- 54 and the bell crank 55 to the link 52, which swings the arm in one direction or the other and causes the lower link to raise or lower the rear end of the swinging link 28 and the attached gauge to the plow beam 2|.

The second arm 52 of the power lift bell crank 52 is provided or formed with a pair of yoke sections and which are spaced apart and receive a trunnion 61 therebetween; The member 61 is apertured and slidabl-y disposed about the upper end of a link 55. The upper end of the iatter is threaded and receives a pair of lock nuts II. The lower end of the link is .is formed or wheel 25 relative provided with a yoke" which is connected by a pivot 12 to the plow beam 2|. In the normal operating position, as shown in Figures 1 and 2, the. trunnion member 61 is disposed a substantial distance below the-lock nuts ll, which construction provides means in the form of a lost motion connection between 'the plow beam 2| and the power lift mechanism, which construction permits the plow beam 2| and the gauge wheel 25 connected therewith to rise and fall relative to the tractorabout the hitch connection 22 at the forward end of the plow beam'2l. Thus, the gauge wheel 25 determines the operative position of the plow bottom 22 independently of the position of the tractor. During this rising and falling movement of the plow beam 2| and the gauge wheel 25, the connecting link or crank axle 25 of the latter pivots about the section 21 which is supported for rocking movement on the tractor at the lower ends of the standards 28 and 29. Since the forward end of the link Bl, the longitudinal position of which determines the angularity of the toggle arms 35 and 25. and hence the position of the gauge wheel 25 relative to the plow beam 2|, is disposed closely adjacent the axis of the crank axle section 21, it will be seen that rising and falling movement of the gauge wheel will occasion very little change in position of the toggle arms 25 and 3|, and hence the operating depth of the plow bottom 22 is maintained substantially constant even though the -operator who usually rides on the seat '83, and

the hand lever 8| is connected by a link 85 to one arm of a small bell crank 85, the other arm of which is connected by a link 81 to the valve lever lift shaft II in the position it occupied at the moment the valve l2 was returned to its intermediate or locked position from a position providing for rocking the shaft II in one direction or the other. Preferably, the movement of the hand lever 8| forwardly, or in a clockwise direction as viewed in Figure 2, provides for a raising or clockwise movement of the rock shaft II, and similarly a rearward or anti-clockwise movement of the hand lever 8| operates the power lift valve means in such a way as to cause the power lift rock shaft II to be rocked in an anti-clockwise direction. 'As explained above, at any point the hand lever II can be returned to its intermediate or neutral position, locking the power lift shaft II in that position against further movement in either direction. v The operation of the mechanism so far described is substantially as follows:

Referring to Figure 2 where the plow bottom 22 is shown in its deep plowing position, and the valve controlling lever 8| in its intermediate or,

implement is free to pivot vertically about the hitch 22 relative to the tractor to follow inequalities in the ground surface and the position of the pivot at the-forward end of the link it closely adjacent the axis of the gauge wheel link section 21 prevents such movement of the implement relative to the tractor from aflecting the position 'of the gauge wheel 25 relative to the tool beam 2|. When it is desired to raise the plow; bottom 22 into a shallow plowing position, the valve lever 8| is moved forwardly, or in a clockwise direction as viewed in Figure 2. This opens the valve means I2 and causes the hydraulic power lift mechanism to rock the shaft II in a clockwise direction (Figures 2 and 3), and the corresponding movement of the power lift arm 5| exerts a thrust generally rearwardly through the link 54 to rock the bell crank 55 in a counter-clockwise direction (Figure 3), and thisexerts-aforward pull through the link fill which moves the toggle links or arms 35 toward their extended or straightened position and thrusting forwardly on the gauge wheel 25 to raise the plow beam 2| relative thereto, as shown inFigure 3. relative to the plow beam 2| to the desired extent, the operator returns the valve lever 8| to its neutral position, thereby locking the power lift shaft ,ll against further movement and thus holding thegauge wheel in its adjusted position relative to the plow beam 2|.

As shown in Figure 3, when the plow bottom 23 is raised to its shallowest position, the trunnion member 51 is raised by the corresponding movement of the power lift arm 52 up to but not in engagement with the nuts III at the upper end of the lifting link 89, there being clearance as shown at S to-permit the implement to move vertically relative to the tractor in following the when the gauge wheel is moved ground surface. Upon further actuation of the power lift shaft II in a clockwise direction, as by moving the valve lever 9| into or holding it in its raising position, the rear end of the power lift arm 52 will now move up into engagement beam 2| will be lifted into its raised or transport position, as shown in Figure 4. While the initial movement of the power lift arm 52, as from p the position shown in Figure 2 to the position shown in Figure 3, servesto lower the gauge wheel 25 relative to the plow beam 2|, so as to move the plow bottom 23 into a shallow plowing position, it will be seen that the continued upward movement of the power lift arm 52 to raise the implement into its transport position does not continue to move the gauge wheel 25 downwardly relative to the tool beam 2| as occurred during the initial movement of the arm 52. This result is secured in the following manner: In the, deep plowing position (Figure 2) the arm is disposed at an angle of something more than 90 degrees relative to the link 5|, and the latter in turn is disposed at an angle somewhat less than 90 degrees relative to the bell crank arm 56. However, after the first range of movement of the power lift rock shaft carries the trunnion member 81 up against the nuts HI and swings the arm 5| into a position movingthe gauge wheel 25 to its shallow plowing position, the arm 5| approaches a straight line position relative to the link 54, and as will be readily understood, this is a position in which further angular movement of the arm 5| relative to the link 54 oocasions only a small amount of movement of the bell crank 55, since the link 54 will not be shifted longitudinally except through a small amount. Further, in this position of the parts the toggle arms or links 35 and 26 also approach their straight line position, so that whatever small amount of movement of the bell crank 55 is occasioned by the movement of the power lift rock shaft H from the position shown in Figure 3 to the position shown in Figure 4 has only an insigniflcant or negligible effect upon the position of the gauge wheel 25 relative to the plow beam 2|. By comparing Figures 3 and 4, it will be seen that the gauge wheel 25 moves only slightly relative to the plow beam 2| while the latter has been lifted from its shallow plowing position (Figure 3) into its completely raised position (Figur 4).

It will be understood, of course, that the angular relations described above are merely examlink 26 and the tractor (Figure 2) to a position slightly forward thereof (Figure 3) during the movement Of the parts in the depth adjusting range, and further, that the point of pivotal connection between the forward end of the link 60 and the lower end 51a .of the bell crank arm 51 swings substantially through the pivot axis of the link 28. By virtue of this construction, the pivot points of the links 28 and 80 are so near together that swinging movement or the plow beam 2| about its hitch 22 at the forward end of the tractor in accommodating inequalities in the ground traversed will have substantiall no eifect upon the relation between the gauge wheel and the plow beam 2|, which relation is determined by parts carried, not on the plow beam itself but upon the tractor. This is an important feature 01' the present invention, namely, gauging the depth of operation'by means on the tractor but I permitting the gauging means and the earth working tool to have relatively free movement relative to the tractor. As will be readily understood, by moving the lever 9| rearwardly, the power lift rock shaft may be rocked from the position shown in Figure 4 to first lower the plow into operating position and then to cause the plary and that various changes may be made therein as required by the operating oharacteristics of the implement in which the adJusting and lifting connections are incorporated. The important feature is, as will be apparent, the arrangement of the parts whereby through the action of a single member, such as the power lift rock shaft II, the first range of movement thereof effects an adjustment of the Banging means. thereby moving a gauge wheel or the like relative to the tool beam 2|, and that a subsequent range of movement ,of said member serves to lift both the tool means andthe gauging means out of ground engaging position and into a transport 'position'(Figure 4) Further, it will be seen that in its range of movement, the lower arm 51 of the bell crank 55 swings from a position slightly tothe rear of the pivot connection between the tions in that position.

Ordinarily, the farmer desires to maintain a substantially constant depth of plowing througharm 5| to exert a pull on the link 54 and hence swing the bell crank 55 in a clockwise direction (Figures 3 and 4) thus permitting the plow bottom 23 to lower relative to the gauge wheel 25 to the desired operating depth. When the plow bottom 23 reaches the desired 'depth the valve lever. 8| may be returned to neutral position, which looks the power lift and gauging connecout the whole field, even though it is necessary to raise the plow to transport position (Figure 4) when turning around at the ends of the field. If necessary, the farmer can always return the plow bottom 23 to lowered position at exactly the depth desired by watching the plow and at the proper moment returning the valve lever II to its neutral position. However, according to the principles of the present invention, 1- provide ,meansassociated with the power lift mechanism and the controlling valve lever 9| therefor, so constructed and arranged that the mechanism may be so adjusted as to return automatically to the same depth without requiring an attention on the part of the operator other than first making the desired depth setting and then initiating the lowering of the implement, the mechanism then subsequently returning the valve means automatically to its locked position when the plow bottom 29 and/or gauge wheel- 25 occupy the desired relative position to secure the proper depth of operation as determined by the depth'setting.

Referring again to Figure 1, the valve adjusting lever 9| carries an extension 9| having serrations or ridges 92 over which the upper end of a lever 99 may be moved. The lever 92 is pivoted at 94 on the lever'll and carries a pin 96 on which the slotted end, as at 91, of the link 98 is received. The other endof the link 92, as shown at 99, is pivotally connected to the third arm of the power lift bell crank 50. The lever 93 serves as a depth setting member and carries a hand grip or handle II.

The function of the link 92 and associated parts is to act through the lever 93 to automatiposition,

, (dotted lines. Figure that the pin 99 occupies a position adjacent the upper and outer end 'of the slot 91. Also, in Figure 5, the lever 93 occupies a position close to the lever 9|, which corresponds to the adjustment of the parts for shallow plowing, as shown in Figure 3. Assuming that the farmer desires to return the implement from its raised. position (Figures 4 and 5) to its lowered position (Fig-' ure '3) he manually moves the valve lever 9| from its full line position in Figure 5 to its dotted line the depth setting lever 93 moving bodily with the lever 9| as permitted by the slot 91 accommodating the downward and rearward movement of the pin 99 therein. The rear movement of the lever 9I actuates the power lift valve means sdas to cause the rock shaft II to be rocked in a counter-clockwise direction (Figures 4 and 5), and the downward swinging movement of the arm 52 inconsequence thereof lowers the plow,

and at the same time the downward and for-- ward swinging movement of'the power lift arm 5I acts through the link 54 to position the gauge wheel 29 for shallow plowing (Figure 3). Further, and alsoat the same time, the forward and upward swinging movement of the arm 53 shifts the link 99 forwardly until the inner end of the slot 91 engages the pin 99. Further continued downward movement of the power lift shaft II and the' power lift bell crank 59 then exerts a thrust through the link 99 against the pin 99" until the lever 9I is automatically moved 'back into its neutral position (full lines, Figure 5),

' thereby locking the parts for plowing at the operating depth as determined by the position of the lever 93 on the lever 9|. If, instead of .being adjacent the hand lever 9|, the depth setting lever 93 is disposed in adjusted position, such as.

indicated in Figure 2 for deep plowing, it will be apparent that when returning the plow to operating position, the link 99 will be required to moveforwardly an additional amount before engaging the pin 99 and automatically returning the lever 9I to its neutral position. Hence, when the lever 93 is in the position shown in Figure 2, the power lift mechanism continues to lower the arm past the position shown in Figure 3, which action shifts the gauge wheel links and 39 to the position shown in Figure 2 before the lever 9| is automatically returned to its locked position. Therefore, according to the principles of the present invention, the operating position of the implement is automatically controlled by the setting of the lever". Preferably, the slot 91 is of sumcient length that 99 can move into its raised position (Figure 5) while the arm 9|, controlling the power lift valve mechanism, remains in its forward position setting of the lever 93on the sector 9|. This is for the purpose of preventing the movement of the power lift mechanism to raised position affecting the valve operating lever 9|, since it is.

preferable to have the plow raised to the same position, regardless of the depth setting of the lever 93. As disclosed in my prior patent, identifled above, the power lift mechanism will automatically stop in its fully raised position, independently of the position of the valve controlling lever 9I. However, if it is desired to automatically control the implement by moving the valve the power lift bell crank 3), regardless of the depthlever 9I automatically to a position when the bell crank 59 reaches its completely raised position (Figure 5), a second link, similar to the link 99, may be pivoted at 99 or some other part and slotted to receive a pin, similar to the pin 99 on the lever 93, mounted on the lever 9 I WhereLY, regardless of the'setting of the lever 93, the lever 9| will automatically be moved into neutral position when the bell crank member 99 on the powhave shown the present invention as applied to a single bottom tractor mounted lister. A lister sleeve member I93 of this general type is disclosed and claimed in the co-pending application of Walter H. Silver, Serial No. 296,925, filed Sept. 28, 1939. InFigures 6-8, the lister frame is indicated by the reference numeral I29 and consists of a pair of frame bars I2I and I22 extending generally longitudinally of the tractor I to which it attached by means of a pair of vertically depending bars I24 pivoted at their upper ends to the tractor frame bars 3 and secured at their lower ends to a transverse draft member in the form of an angle bar I25. Draft rods I29 extend forwardly from the cross bar I25 to the front portion of the tractor, and the frame bars I2I and .I22 are pivoted by means of pivot bolts I21 to brackets I29 which are .bolted, as at I29, to opposite ends of the cross bar I25. The pivot bolts I21 define a transverse pivot axisabout which the tool bar or beam structure I29 may swing generally vertically relative to the tractor I.

The reanends of the frame bars III and I22 converge rearwardly, as indicated at I2Ia and are bolted at I3I to the upper end of a lister bottom standard I32. A lister bottom I33 is secured to the lower end of the standard I32.

The gauging meansfor the implement shown in Figures 6-8 comprises a pair of crank axles I39 and I39 pivotally connected to the associated frame bars I2I and I22, respectively, and carrying gauge wheels I4I at their rear ends. Each of the crank axles I39 and I39 includes a laterally outwardly bent end I43 rocking movement in a bracket I44 secured, as by bolts or the like, to the associated frame bar, and similarly, each of the crank axles also includes a laterally inwardly bent end I49 on which and I22 adjacent the rear ends of the converging portions thereof. The pivot connection between the two arms or links I49 and I5I is indicated in Figures I and 9 by the reference numeral I51. A second arm I9I is fixed to the rock shaft I52 and at its outer end is pivoted to trunnions on a that is slidable on the upper end of a strut I94. is pivotally connected, as at I95, to a pair of angle brackets I99 which are bolted, as at I91, to the.

under side of the tractor rear axle housing. A stop "I is fixed to or formed on the strut I94 in a position to be engaged by the slidable memwhich is-received for The lower end of the latter ber I83 to enable the tool beam to be raised, as will be explained below. The arms NH and I8I constitute in effect, a bell crank of which the arms are sections connected, respectively, with the gauge wheel I and the strut I84.

In this form of the invention, the power lift mechanism III is, as in the form described above, so connected with the gauge wheel structure that vertical swinging movement of the tool beam relait possible for the latter to swingvertically, carrying with it the gauge wheel 28, but without having the movement of the plow beam and/or gauge wheel relative to the tractor, and the gauging and lifting connections carried thereby, introduceany variations in the position of the gauge wheel relative to the plow beam 2I. In the form of the invention shown in Figures 6-8, the connections for gauging and lifting include a flexible element trained about a sheave that rotates-about an axis coincident with the axis of the pivot bolts I2'l. Hence, the frame structure I is enabled to swing vertically, carrying with it the gauge wheels I, but the gau ing and lifting connec-' tions extending between the gauge wheel structure and the tractor do not cause the positions of the gauge wheels I relative to the frame structure to vary.

In this form of the-present invention an arm I88 is fixed to one endof the power lift rock shaft I I' and is connected by means of a flexible cable Ill, which is trained over a pulley I82 on the rear axle, a sheave I83 carried by the cross bar I28 and an idler sheave I84 on the frame bar I22, to an arm I 88 fixed to one end of the rock shaft I82 carried on the lister beam for rocking movement in the brackets I83. As best shown in Figure 8, the sheave I83, the axis of rotation ofwhich coincides with the pivot axis for the lister beam structure as defined by the pivot bolts I21, is carried by a bracket I ll bolted orotherwise fixed to the cross bar I28. Preferably, the sheave I83 is mounted for rotation on the bracket I8I by a pivot bolt I82. The idler sheave I84 is supported for rotation by a bracket I83 fixed in any suitable manner to the beam structure I 20. Since the sheave I88 is mounted'for rotation about the pivot axis of the lister beam or frame structure I28, it will be seen that rising and falling movements of the lister will not introduce any variations in the position of the gauge wheels relative to the lister frame. V

.The operation of the construction shown in Figures 6-8 is substantially the same as that describedabove in connection with Figures 1-5. In Figures 6-8, when the valve lever 8 I is moved forwardly the rock shaft II is rocked in a direction to raise the implement, namely, in a clockwise direction as viewed in Figure 8. This exerts a pull through the cable I8I and acts to rock the arm I88, also in a clockwise direction.. .This acts through the toggle arm or link I5I and exerts a downward thrust on the links I48 and thefassociated gauge wheels I, thereby raising the lister bottom I33 substantially to the position shown in Figure 7, which is the shallowest working posi- I same protection for the tion. The relation of the links is: and m is 6 such that at this point the shiftable sleeve member I83 is spaced as at S, from the stop flange III. If the valve lever or raised position, the power lift shaft II continues to rock in a clockwise direction and the pull exerted thereby, through the cable I8I against the arm I88 causes the outer end of the arm II to move the member I83 into engagement with the stop "I and react through the strut I84 and brackets I86 against the tractor to raise the lister beam structure I28 from the position shown in Figure 7 to the position shown in Figure 8. However, it will be noted from Figure! that the toggle arms or links I48 and lil are nearly in their straight line position, and hence the angular movement of the member I53, I88 necessary to raise the tool beam to the transport position shown in Figure 8 does not cause the gauge wheels I4I to move very much farther relative to the tool beam. In fact, the toggle links I48 and I5I serve to hold the gauge wheels I in a position slightly below the lister bottom I33 when the gauge wheels and the lister bottom are raised into theirtransport position, as shown in Figure 8. The wheels I thus are in a position to prevent the plow bottom point from digging into the ground if the tractor wheels should pass down into a depression. In this case the wheels I would engage the ground and momentarily lift the whole implement, as permitted by the slidable member I63. If desired the links 35, 38 and 88, 51 of Figures 1-5 may be arranged to provide this plow bottom 23 when raised. 4

When the tool beam reaches the position shown in Figure 8, the valve lever BI is returned to its intermediate or locked position. Thus, according to the present invention I provide suitable connections between the power lift arm I88 and moving any material extent relative to the tool beam being raised. The lister is lowered from its transport position into an operating position by moving the valve lever 8| the modification shown in Figures 1-5 and described above, and when the lister reaches the desired operating depth, the valve lever 8|, is returned to its intermediate or locked position which holds the gauge wheels and associated parts in their adjusted operating position. If desired, the automatically operating means for returning the valve lever 8| to intermediate po;- sition when the plow reaches a predetermined depth, such as is shown in Figures 1-5 and described above, may be employed in the construction illustrated in Figures 6-8. However, for purposes of clarity, such automatic means for returning the lister to' a predetermined operating position has been omitted from Figures -6-8.

Both of the agricultural implements described above have been in the nature of integral plows carried by the tractor at the rear thereof. However, the principles of the present invention are equally applicable to implements carried at the front of the tractor, such as, for example, culti- 8I is held in its forward rearwardly, as in both 'for; changing vators having gauging the operating depth of the cultivating tool or tools and adapted to be raised into in-' operative or transport position.

Referring now more. particularly 9-12, inclusive, the tractor l is shown as provided with one or more cultivator units, indicated by the reference numeral 200, supported by one or more-transverse draft beams 20L The latter extends outwardly from the forward portion of the tractor at each side thereof according to the usual arrangement of tools of this character. Rigidly secured to the draft beam 20l is one or more supporting members 203, depending upon the number of rigs 200 employed. Each supporting member 203 includes an upper section 204 in which a rock shaft 205 is carried and the lower section 206 in which the pivot 201 of a connecting link member 200 is received. An upper link 2l2 is disposed in substantial parallelism with the lower link 200 and is provided at its upper end with a screw threaded portion received in a socket 2B which is pivotally mounted on the rock shaft 205. The lower end of the link 212 is turned outwardly, as at MS, and is pivotally disposed in the upper end of a bracket 2|! forming a part of a shovel supporting member 2l0, the lower end of which is provided with aperture legs 2|! in which the lower end of the lower link 200 is disposed and connected thereto by a pivot pin 220 or other suitable means. A shovel unit 22! is adiustably secured to the member 2I8 by means of a bracket 222.

Also pivotally mounted on the end MB of upper link 212 is an L- haped bracket 221 carrying a sleeve 220 at its forward end in which the spindle 229' of a castering gauge wheel 230 is disposed, and the position of the gauge wheel 220 relative to the tool MI is controlled ,by means of a link 234 which is pivoted at its lower end 235 to the armor end, as-best shown in Figure l2,is bent later.- ally, as at 235, and pivotally received in a depth adjusting arm 240. The latter is fixed by a set screw or the like, as indicated at 2 in Figure 12, to the pivot shaft or rock shaft 205.

A cultivator rig of this general construction is disclosed and claimed in the Patent No. 1,962,- 349, issued'June 12, 1934, to Theodore W. Johnson, to which reference may be had if desired. As disclosed in said patent, the links 200, M2 and 234 are arranged in parallelism so that the tool 22l and its gauge ,wheel 230 may rise and fall relative to the tractor so as to follow free,- 1y any variations in the ground surface. Further, rocking of the arm or arms through the associated link 234 to change the position of the guage wheel 230 relative to the tool 22l. As more clearly shown in said patent, thepivotor rock shaft 205 carries as many arms 240 as there are cultivator rigs 200 at that side of the tractor.

According to the principles of the present invention, I provide means whereby the power lift mechanism l of the tractor may be utilized,

the depth adjustment of the gauge wheel or wheels 230 and for raising the cultivator rig or rigsinto transport position out of engagement with the ground. To this end, an arm 250 is suitably fixed at its'lower end to the rock shaft 205 and at its upper end carries a member 25! fixed, as'by collars 252 and 25211,

to the forward end of a power rear end of the latter is pivoted, as at 254, to an operating arm 255 fixed to the rock shaft ll of gauge wheelsor other means for.

to Figures the bracket 221 and at its upper mechanism l0. Where there are cultivator rigs at opposite sides of the tractor I, each end of the rock shaft ll may carry an arm 255 connected to the rod 253 to the associated rock shaft arm 250. According to the present invention, each of the adjusting arms 240 is formed with a lug 260 which, as best shown in Figure 12, extends laterally underneath the associated sleeve 2l3 to which the forward end of the link M2 is connected.

The operation of the implement shown in Figures 9-12 is similar to the implements described above. The power lift mechanism I0 is controlled by the hand lever 0l in the manner described above. When the hand lever 0| out of its neutral position into a forward position, the power lift arm wise direction (Figure 9), which exerts a thrust through the rod 253 on the arm 250. This'rocks the pivot shaft 205 in a clockwise direction, which exerts a rearward thrust through the link 234 against the gauge wheel bracket 221, raising the tool 22l relative thereto. Figure 9 shows the latter in a relatively deep ure 10 shows the relative when the power lift mechanism l0 has been actuated to act through the arms 250 and 240 to raise the tools to shallowest position, at which point the lug or lugs 260 are in a position ready to engage the sleeves 2|3 of the links 2l2. After this occurs, a further'forward movement of the the power lift rod 253 acts through the arm 250 and pivot shaft the position shown in Figure 9 240 willact lift link :53. 'The 205 to raise the cultivator rig or rigs intotheir lifted position, as shown in Figure 11. It will be seen, therefore, that the arm or arms 240 have two ranges of movement; first, in moving from to the position shown in Figure 10, the arm or arms 240 determine the position of the gauge wheel or wheels 230 relative to the tools, and second, when the arm or arms. 240 move from the position shown in Figure 10 to the position shown in Figure 11, both the tools and the gauge wheel or wheels are raised together out of ground engaging position. Preferably, the gauge wheels 230 are disposed to one side of the path of movement of the associated tool 22!, so that when the rig is raised, each gauge wheel may be disposed in a position alongside the associated tool. Like the form of the invention shown in Figures 6-8, the automatic valve controlling means shown in Figures 1-5 may, if desired, be employed in the construction just described for adjusting the depth of operation and automatically returning the tool or tools to the selected working position. It will also be'apparent that the means I have provided for gauging the depth of operation of tools, freely movable relative to the tractor, from the power lift mechanism of the tractor may be utilized with tools both at the tractor, as by combining the mechanisms shown in either of the first described two modifications erally speaking, the power lift shaft, or the arm' or arms connected therewith, forms a part which is operatively connected with the gauging means for first adjusting the same relative to the associated toolmeans and then raising both the tool to the means and the gauging means relative is moved 255 is rocked in a clock-- plowing position, and Figpositions of the parts front and rear of the tractor.

new.

While I have shown and described above the preferred means in which the principles of the So far as I am aware, this is broadly present invention have been incorporated, it

will be apparent to those skilled in the art that my invention is not'to be limited to the particular means shown and described above, but that, in fact, widely different means may be employed in the practice of vention.

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

1. An agricultural machine comprising a tracthe broader aspects of my inl0 then raising both said gauge and tool and means for shifting the other of said links for varying the position of the gauge means relative to said tool means.

7. The combination with a tractor, of tool means movably connected therewith, gauge means normally movable with said tool means but capable of being shifted relative to said tool means for gauging the operation thereof, means on the tractor for first shifting the position of said gauge means relative to said tool means and means together, and means associated therewith for limiting the lowered position of said tool means.

tor having a power connection, tool means connected with the tractor, means for gauging the, depth of operation thereof, means for lifting said tool means, and means deriving power from the tractor power connection for actuating said gauging means and said lifting means in succession.

2. An agricultural machine comprising a tractor having a power connection, tool means connected with the tractor for movement relative thereto, gauging means normally movable with said tool means relative to the tractor, means for a lifting both the gauging means and the tool means, and means deriving power from the tractor power connection for actuating said gauging means and said lifting means in succession.

3. An agricultural machine comprising means serving as an implement frame, tool means movably connected therewith, gauging means connected with said frame means for movement relative thereto about an axis, adjustable connections between said tool means and said gauging means and operative to cause the latter to move with said tool means relative to said frame means when the tool means is moved, a member for operating said adjustable connections and extend-' 40 ing to a point adjacent said axis, and means on the frame means pivotally connected with said member at a point closely adjacent said axis for adjusting said connections and determining the position of said tool means relative to said gauging means while accommodating movement of the latter with the tool means.

4. The combination witha tractor, of tool, means movaoly connected therewith, gauge means normally movable with said tool means for gauging the operation thereof, means for shifting the position of said gauge means relative to said tool means, and a member on the tractor connected with both said tool means and said tuate said gauge means means.

5. An agricultural implement comprising an implement frame, a plow beam movabiy conand then raise said tool nected therewith, a gauging means movabiy connected with said plow beam, a link connecting gauge means and operative sequentially to ac-' 8. The combination with a tractor, of ground engaging tool means connected to receive draft therefrom and to move generally vertically relative thereto, a gauge wheel, connecting means -between said gauge wheel and said tool means and movable to gauge the depth of operation of the latter, power lift mechanism for actuatingsaid connecting means, and a lost motion connection actuated by said power lift mechanism and first accommodating movement of said movable member when shifting said gauge wheel relative to said tool means and then acting to raise bothsaid tool means and said gauge wheel relative to the tractor after the lost-motion has been taken up. I

9. The combination with a tractor, of ground engaging tool means connected therewith to receivedraft therefrom and to move generally vertically relative thereto, a gauge wheel normally movable with said tool means but capable of being shifted relative to said tool means for gauging the depth of operation thereof, a member having a lost motion connection with said tool means, anda part movable to position said: gauge wheel relative to said tool means to adjust the depth of penetration' of the latter and simultaneously move said member to take' up said lost motion, further movement of said part acting through said member to raise said tool means and said gauge wheel.

g 10. The combination with a. tractor having a power lift, of ground engaging tool means connected therewith to receive draft therefrom and to move generally vertically relative thereto, a gauge wheel, movable connections between said gauge wheel and said tool means and movable to gauge the depth of operation of the latter, a

member driven by the tractor power lift and having a lost motion connection with said tool means, and a part movable with said member and operable to position said connections while the movement of said member serves to take up said lost motion, further movement of said power lift acting through said member for raising both said gauge wheel and said tool means.

' 11. An agricultural implement comprising tool means adapted to be raised and lowered, gauge means for said tool means, said-gauge means being movable relative to said tool means to gauge the operation thereof, a power lift operated lever, means operated by the latter through one range of movement thereof for s ting said gauge means relative to said tool means for gauging the depth of operation of the latter, and means operated by said lever through another range of means serving as a supporting frame, tool means movably connected therewith, gauge-means including'a ground engaging element and means connecting the latter with said tool means, a pair of links connected with said gauge means, means connecting one of said links with .said frame,

movement thereof for raising both said tool means and said gauge means out of ground enaging position.

12. The combination with a tractor, 'of tool means movabiy connected with the tractor for movement relative thereto, gauge means movabiy tractor for movement relative connected with said tool means for gauging the operation thereof, means on the tractor and reacting thereagainst for shiftin the position of the gauge means relative to the tool means to change the depth of operation thereof, and means connecting said tool means and the means on the tractor that shifts said gauze means for depth of penetration thereof, operated movement of said member through one range for adiustlng the position of said gauge means relative to said tool means, means operatl ve by movement of said member in one direction through another rangefor raising both the tool determining the lowered position of said tool means I 13. The combination with a tractor, of tool means movabiy connected with the tractor for movement relative thereto, gauge connected with said means movably tool means for gauging the operation thereof, mechanism for moving said gauge means relative to said tool means, means,

swingably connecting the gauge means with the thereto about an axis and accommodating movement of said gauge means with said movable toolmeans, and depth adjusting means on the tractor and connected with said mechanism at a point closely adjacent said ax 14. An agricultural machine as defined in claim 12, further characterized, by said tractor having a power lift including a movable member to which said connecting means connects said tool means, and means on said movable member for automatically determining the lowered position of the tool means.

15. The combination with a tractor having a power lift, of tool means movably connected with the tractor for movement relative-thereto, gauge means movably connected with said tool means for gauging the operation thereof, mechanism for moving said gauge means relative to said tool means, means swingably connecting the gauge means with the tractor for movement relative thereto about an axis and accommodating movement oi said gauge means with said movable tool means, a pair of interconnected parts mounted on the tractor, means connecting .one of said parts with said mechanism at a point adjacent said axis, lost-motion means connectin the other part withsaid tool means, and means on the tractor for operating both of said parts.

.16. An agricultural machine comprising a tractor having a power lift of the type in which a member may be moved to" and held in various positions, tool means, gauge means movably connected with said tool means, means operated by movement of said member through one range for adjusting the position of said gauge means relative to said tool means, and means operated by movement of said member through another range for raising both the tool means and said gauge means. i

17. An agricultural implement. adapted to be attached to a tractor having a power lift of the type in which a member may be moved to and held in various positions. comprising tool means adapted to be movably connected with the tractor, gauge means movably connected with said tool means, means adapted to be operated by movement of said member through one range for adjusting the position of said gauge means relaoperated by movement of said member through another range for raising both thetool means and said gauge means.

18. An agricultural machine comprising a tractor having, a power lift of the type'in which a member may be moved to and held in various positions, tool means mcvably connected with the tractor, gauge means movably connected with "said tool means and operative to determine the adapted to traverse and said pair of move said gauge causes said first 19. A machine as defined in claim lsrfurther characterized by the provision of a lever for eon-.

trolling the operation of said power lift member. rixed to said lever, and con-. said member and. said part, is moved into a position lookfurther movea part adlustably nections between whereby said lever ing said power lift member a ment' after it has been rection a predetermined amount. l

20. In an agricultural implement adapted to be connected to a tractor having a power lift, the combination of a generally longitudinally extend-v ing vertically swingable toolv beam carrying tool means, a gauge wheel the surface of the ground for gauging the depth of operation of said tool means, a pair of links operatively connecting said gauge wheel with said tool beam, one of said links being pivoted to the latter and pivotal motion thereof acting through the other link to position the gauge wheel relative to said tool means, means actuated by said power lift, lost motion means connecting said power lift actuated means with said tool beam, and means ex-, tending between said power lift actuated means links for shifting the latter to said power lift actuated means first serving to take up the lost motion in said lost motion means, further movement of said power lift means acting through said lost motion means for raising said tool beam relative to the tractor, said links being disposed at such an angle relative to one another after the power lift actuated means takes up said lost motion that the movement of said shifting means when raising the tool means occasions only a small amount of movement of the gauge wheel relative to the tool beam.

21. An agricultural implement comprising the combination with a tractor having a power lift including a part adapted to be moved to and held against movement in various positions, ground engaging tool means adapted to be raised and lowered relative to the tractor, accuse wheel pivotally connected'with the tractor for vertical swinging movement, means serving as a toggle linkage operatively connecting and tool means whereby movement of said toggle linkage operates to shift the position of said gauge wheel relative to said tool'means, a bell crank pivoted to the tractor and having one arm with-said toggle linkage, means linkage'being arranged so that it moves into a generally straight line positionat the same time the corresponding, movement of said bell crank toggle linkage to move into its generally straight line position, and operative connections between said power lift part and said moved in said other di-.

wheel relative to said tool beam,

.further movement nected therewith, a

' a member pivoted thereto, a

a be rocked in one direction or the other and arranged to be shifted into a neutral position causing said rock shaft to be locked against movement in either direction, the combination of tool means adapted to be connected with the tractor for generally vertical movement relative thereto,

means actuated by said rock shaft and operatively connected with said tool means for raising and lowering the latter, and means movable concomitantly with said tool means and operatively connected with said lever for automatically moving the latter into a neutral position when said tool means reaches its lowered position.

23. The combination set'forth in claim 22, further characterized by a part adiustably connected with said lever and operatively associated with said concomitantly movable means for adjusting the position of said toolmeans when said valve controlling lever is moved into its neutral Position.

24. The combination set forth in claim 22, further characterized by the provision of connectionsbetween said rock shaft and said lever including a link having a slot therein and-operatively connected with said rock shaft, and a part on said lever having a projection received by the slot in said lever, whereby the latter is connected with said rock shaft through a lost motion connection, movement of said lever in a direction tov carry said projection from one,

end of the slot toward the other serving to cause said rock shaft to be rocked in a direction to raise said tool means and movement of the lever in the other direction serving to cause said rock shaft to be rocked in a direction to lower said tool means, said one end of said slot being engageable with said projection to move said lever back into-a neutral position, thereby terminating of said power lift rock shaft when said tool means hasreached the desired lowered position.

27. In anagrlcultural implement, means serving as an implement frame, tool means movably 1 connected therewith, gauge means also movably 25. An agricultural machine comprising an implement frame, a cultivator rig movably connected with said rig, andpower lift means operatively connected with said rig and gauging means and adapted through a first range of movement toshift said gau ing means relative to said cultivator rig to determine the depth of operation thereof and through another range of gauging means movably con-- movement for raising both said cultivator rig and said gauging means out of ground engaging position.

26. In an agricultural implement, a tool bar, gauge wheel carried by said member and operative to determine the working position of said tool .bar, and means of movement for to said tool bar operative through one range swinging said member relative to vary the working position of the latter and having a part engageable with said bar for swinging'the latter and said gauge wheel into transport position.

a part engageable with the connected with said frame means and operative to swing relative thereto about a pivot axis, and means for adjusting the position of said gauge means relative to said tool means, including a part carried by said frame means and movable adjacent said pivot axis, whereby the position of the gauge means relative to the tool means is I substantially unaffected by variations in the position of the tool means relative to the implement-frame.

28. The combination set forth in claim 27, further characterized by means "operative after said part has moved through an adjusting range for-raising both saidtool means and said gauge means relative to the implement frame means.

29. In an agricultural implement, means serving as an implement frame, tool means, means pivotally connecting said tool means with said frame means, gauge means, means pivotally connecting the latter with said frame means, means adjustably connecting said gauge means with said tool means, and means extending adjacent said acting auge last mentioned pivot .connection and through said adjustable means to shift said means relative to said tool means for determining the depth of operation of the latter irrespective of movement of said tool means relative to said implement means about its pivot connection therewith.

so. The combination with a cultivator having an implement frame, a cultivator rig movably .ing the position of said gauging means relative to said rig, said last mentioned means including rig upon further movement for raising both 31. An agricultural machine comprising a tractor, tool means connected with the tractor for movement relative thereto, means serving as a bell crank mounted for rocking movementon the tractor, means connected with onearm of said bell crank means for gauging the operating position of said tool means, and means connected with the other arm of said bell crank-means for -3l, further characterized by hydraulic means driven from the tractor for rocking said bell crank means.

34. Anagricultural machine as defined in claim 31, further characterized by hydraulicmeans driven from the tractor for'rocking 'said' bell crank means, and means for controlling said hydraulic means from the position of said bell crank means.

35. An agricultural machine as defined in claim 31, further characterized by said first mentioned connecting means including connections where-' v by when said second bell crank arm moves said tool means into an inoperative position said first said rig and said, gauging means relative to said frame.

gausingmansrelativetoaidtodmans.

36. Anagrlculturalmachineah-actor, tool mans connectedwtih their-actor for movement relative thereto, mans serving as a bell crank mounted iorrocklng movement on the -toolmeans,mauseonnectedwlthonearmol ,saidbellcrankmans-iorflreoperaflng.

connected position of said tool mans, mam withthe-otherannoisaidbellerankmansfor 'movingsaidtoolmansintoaninoperativeposition,andmeansonthetractoriorrockingsaid bell crankmans.

37. Anagriculturalmachinecomprlslngatractor, tool means connected with the tractor tor movemmt relative thereto, a part mounted on the tractor tor rocking-movement and laying two nal: ground caus wheel. means swingably connecting the caus wheel with said tool mans, means operatively connecting one of saidsections with said swingable means for positioning said-gauge wheel relative tosaidtoolmeans,andmamwherebytheother section moves said tool mans into inoperative tion.

38. An agricultural machine comprising an implement frame, a cultivator rig movably connected therewith, a gauging means movably connected with said rig, a rockabh mormted member having two sections, mans operatively connectingoneoisaidseciionswithsaidgauglngmeans for determining the depth oi operation of said p -1 1 during movement ofsaid member Iorreturningsaidcontrollevertosaidneutral position to stop said member, and'means carby said controllever for adjusting the p0- of one of said stops to advance or retard terminal position of said movable member. In a hydraulic mechanism, the combinaot a pair of cooperative hydrauliccylinder audpiston members movable relative to each other, a control lever associated therewith and shiitable from a neutral position to effect a relative t of said cylinder'and piston, stop mans movable with one of said nmmbers relativeto said control lever to engage stop means carried by the latter and return said lever to a said neutral positionto stop said members at a rlg,andmeanswherebymovementoisaidother section raises said rig into its inoperative posi- -tion. a

39.-An agricultural machine comprising a tractor. a tool beam connected therewith for generally vertical swinging movement, a part movably connected with said tool beam, means mounted for rocking movement on the tractor and having two sections, mans connecting one 01' said sections with said part for positioning the latter relative to said tool beam, and means whereby the other section raises both said .tool means and said part into inoperative position,

\ said one section and its connection with said part serving to limit the movement of the latter relativetosaidtoolmeanswhenthetoolmeans is raised by said other section.

40. The combination set forth in claim 22, further characterised by the provision of a pair of stops associated with said movable means and said lever, respectively, and interengageableduringmovementotsaidtoolmeanstor returning said control lever to said neutral position to stop said tool means, and means carried by said control lever for adjusting the position clone of said stops to'advance or retard the terminal position of said tool means.

41. The combination set forth in claim 22, further characterized by the provision of a handle mounted on' said lever and optionally movable relative thereto, stop means to said movable means, and cooperative stop mans connected to said handle and shift-able relative to said first mentioned stop means by moving said handle relative to said lever, thereby changing the terminal position of said tool means.

42. In'a device of the clam described, the combination of a power actuated movable member, a control lever associated therewith and shiftableirorn a neutral position to elect a movement of said pair oi stops attached to said movable member member in a certain direction, a

certain terminal position, and means. carried by said lever for adlusting the podtions of the inu aw-1 stopmeans relative to said lever and said cooperative hydraulic members to adjustably determine the terminal position of the latter.

44. In a device, of the class described, the combination of a power actuated movable member, a control element associated therewith and shiitable from a neutral position to eilect a movement of said member in a certain direction, a pair of interengageable stops, one of said stops being emaciated with said control element and engageable with the other of said stops to limitthe extent of movement of said member, a manually operable lever connected with said control element, and an adjusting device mounted on said lever for adjusting the position of one of said stops, thereby changing the terminal position of said member.

45. In a device of the class described, the combination of a power actuated movable member, a manually operable control lever associated therewith and shiitable from a neutral position to dial; a movement ofsaid member in a certain direction, a pair of interengageable stops, one of said stops being associated with said leverand engageable with the other of said stops to limit the extent of movement of said member, and a handle movably mounted on said lever-and connected with one of said stops for adjusting the position of the latter and thereby changing the terminal position of said member. 46. In a device of the class described, the combination of a power actuated movable member, a manually operable control lever associated therewith and shiitabl e from a neutral position to eitect a movement of'said member in a certain direction, a handle mounted on said lever and optionally movable relative thereto, stop means attached to said handle and operative to engage cooperative stop means to control the actuation of said lever and thus to limit the extent of movement of said power actuated member, said stop means being shifts-hie by moving said handle, thereby changing the terminal position of said member.

$7. In a device of the class described, the combination of a power actuated movable member,

'a manually operable control lever associated therewith and shiftable from a neutral position to eil'ect a movement of said member in a certain direction, a handle mounted on said lever and optionally movable relative thereto, stop means on said member, and cooperative stop lever by moving said handles relative. to each other with said holding means disengaged, and a second stop means engageable with said shiftable 'stop means when said lever isout of said neutral position to limit the extent of movement of said member,

49. In a device of the class described, the combinationota power actuated movable member, a control lever associated therewith and swingable from a neutral position to effect a movement of said member. in a certain direction,

said control lever comprising a pair of relatively. movable handles mounted for swingin movement about 'an axis and disengageable means for normally holding said handles together to swing as a unit, stop-means attached to one of said handles and shiftable relative to said control lever by disengaging said holding means andmoving said one handle relative to the other, and a second stop means connected to said member and movable therewith into engagement with said shiftable stop means to return the lever to said neutral position to stop the movement of said member.

50. In hydraulic mechanism, the combination of a pair of cooperative cylinder and piston members movable relative to each other, a control lever j associated therewith and shiitable from a neutral position to eil'eci; a relative movement of said members in a certain direction, a

- handle mounted on said lever and movable relative thereto, means for normally holding said handle in fixed position on saidlever for shifting movement therewith, stop means attached to said handle and shiftable relative to said lever by moving said handle :with respect to the latter, and a second stop means connected to one of said members and movable therewith into engagement with said shiftable stop means to v return the lever to said neutral'position to stop the relative movement of said piston and cylinder members.

diseng'ageable means normally securing said levers together-to swing as a unit, and stop means attached to said power actuated member engageable with said adjusting lever for returning said control lever. to said neutral position.

52. In hydraulic mechanism, the combination of a pair 01 cooperative cylinder and piston members movable relative to each other, a valve controllever associated therewith pivotally supported to swing from a neutral position to effect a relative movementof said members in a certain direction, a limit adjusting lever pivotally connected with saidcontrol lever and swingable relative thereto, a rack attached to said control lever and engageable with said adjusting lever to secure said levers together for movement as a unit, a stop attached tosaid adjusting lever and shiftable thereby relative to said control lever,

- and a stop attached to one of said cylinder and position members and movable thereby into engagement with said first stop for returning said 'control lever to neutral position to stop the relative movement of bers.

53. In hydraulic mechanism the combination of. a power actuated movable member, a valve said cylinder and piston memcontrol lever associated therewith and pivotally supported to swing from a neutral position to effect a movement of said member in'a certain direction, a limit adjusting lever pivotally supported adjacent said valve control lever to swing in a plane parallel to the plane of movement of said valve control lever, a rack attached to one of saidlevers and enga-geable with the other of said levers to secure said levers together for movement together, a stop attached to said adjusting lever and shiftabie thereby relative to said valve control lever when the levers are disengaged from each other, and a stop attached to said movable member and movable thereby into engagement with said first stop for returning said valve control lever to neutral position to stop the movement of said member.

54. In a motor vehicle having an operator's station including control apparatus for said vehicle, the combination of an implement mounted separate from the operator's station on said vehicle by means providing for relative movement between the implement and tractor, power .liit' mechanism actuated by the vehicle motor for moving said implement, a manually operable control lever associated with said mechanism and pivotally supported at said operators station, said lever being swingable from a neutral position to effect a movement of said power lift mechanism to shift said implement in a certain direction, a pair of interengageable stops, one of said stops being associated with said control lever and engageable with the other'of said stops to limit the movement of said power lift mechanism to stop said implement in a certain terminal position relative to the vehicle, and a limit adjusting lever mounted at said operators station for adjusting the position of one of said stops for adjustably determining said terminal position. l

55, In a motor vehicle having an operator's station including control apparatus for said -vehicle, the combination of an implement mounted separate from" the operator's station on said vehicle by means providing for relative movement between the implement and tractor, power lift mechanism actuated by the vehicle motor for moving said implement, a manually operable control lever associated with said mechanism and pivotally supported at said operator's station, said lever being swingable from a neutral position to eflect a movement of said power lift mechanism to shift said implement in a certain direction, a Pair of stop means conuected'with said control lever and said power-lift mechanism, respectively,

'and interengageable during movement of the latter to return said control lever to said neutral position when the implement is moved to a predetermined terminal position relative to the vehicle. and a limit adjusting lever pivotally mounted at said operator's station and connected with one of said stop means to-adjust the point or engagement relative to the working range of the power lift mechanism for determining the terminal position of said implement.

56. In a motor vehicle having an operators station including control apparatus for said vehicle, the combination of an implement mounted separate from the operator's station on said vehicle by means providing for relative movement between the implement and tractor, hydraulic power lift mechanism actuated by the vehicle a motor for moving said implement, a manually operable valve control handle associated with said mechanism and supported at said operator's station, said handle being movable from a neutral position to eflect a movement of said power lift mechanism to shift said implement in a certain direction, a limitadiusting handle mounted at said operator's station adjacent said valve control handle and detachably connected thereto for movement therewith but optionally movable independently oi the latter, stop means attached to said limit adjusting handle and shiftable relative to said control handle by moving said limit adjusting handle independently of said control handle, and a second stop means connected with said power liit mechanism and engageable with said shittable stop means during movement of said power lift mechanism when said control handle is out of said neutral position, to determine the terminal position of said implement relative to said tractor.

THEOPHILUS BROWN.

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