US2672800A - Two-way plow with means for automatically tripping the plows and reversing their positions - Google Patents

Description

March 23, 1954 w. F. MELLEN 2,672,800

` TWO-WAY PLOW WITH MEANS FOR AUTOMATICALLY TRIPPING THE FLOWS AND REVERSING THEIR POSITIONS Filed July 21, 1950 4 Sheets-Sheet l 4445 A 40 T4 21'" 4346 4,5 38 /P 63 l 3/a C\` 70 7/ 4/ Z7 Z4 704 65 gg 55 a 7/ 60 l "1 60 75 z H i 5/ 2 46 77'74. \`-G\ 3 A6 l f @f y f2 o" 5?? o 52 a l 75 A l- Z6 36 470 2/ L' l o l ZZ 20 99 o ze zo ff@ 35 S9.

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! n@ 0 Mu /A/v F75/f MEME/v March 23, 1954 W` F MELLEN 2,672,800 I TWO-WAY PLOW WITH MEANS FOR AUTOMATICALLY'TRIPPING THE PLOWS AND REVERSING THEIR POSITIONS Filed July 2l, 1950 4 Sheets-Sheet 2 March 23, 1954 W, F MELLEN 2,672,800

TWO*WAY PLOW WITH MEANS FOR AUTOMATICALLY TRIPPING THE FLOWS AND REVERSING THEIR POSITIONS 0 IN1/'EN Tom- 74 ML2/,4M 775K MEL/ EN 72 72d 87 HiSArroeA/Ers #41995/0501 ESTE/VJ AFR/5 9 ,Q

March 23, 1954 w. F. MELLEN Two-WAY PLow WITH MEANS FOR AUTOMATICALLY TRIPPIN THE PLOWS AND REVERSING THEIR POSITIONS 1950 4 Sheets-Sheet 4 Filed July 21,

Patented Mar. 23, 1954 TWO-WAY PLOW WITH MEANS FOR AUTO- MATICALLY TRIPPING THE PLOWS AND REVERSING THEIR POSITIONS William Fisk Mellen, Sherman Oaks, Calif., as-

signor to Alice Marian Mellen, Sherman Oaks,

Calif.

Application July 21, 1950, Serial No. 175,082

30 Claims.

This invention relates to earthworking implements of the type commonly known as two-way plows which are adapted to be drawn by tractors having automatic power lift apparatus contained therein for the purpose of lii`ting the plows from the ground being tilled.

Two-way plow structures provide oppositely pitched plows which are adapted to be selectively raised and lowered, and are herein referred to as plow bottoms, one plow bottom being lowered when plowing across a field in one direction, and the other plow bottom being lo.` ered for the purpose of plowing across the eld immediately alongside the previously formed furrow, whereby all furrows will be turned in the direction without the necessity of following the old praetice of travelling around the unplowed periphery of the eld and progressing in ever narrowing loops toward the center to keep adjacent furrows turned in the same direction.

A particular object of the present improvement is to provide a highly practical, novel means under the control of the tractor driver for producing automatic shift of the plow bottoms through the medium of the power lift means on the tractor whereby to reverse the positions of the plow beams as may be required in connection with any earthworking operation.

Another object of the invention is to provide in a two-way plow structure means for interconnecting the two plow bottoms in counterbalanced relationship so that an actuating means may be shifted by the tractor driver to energize lifting means for one plow bottom while freeing lifting means for the other plow bottom and allowing such other plow bottom to descend without interference.

A further object of the invention is to provide transversely movable control means which may be readily and selectively moved from one position to another for selectively energizing the mentioned energizing means as required and to neutralize said action when desired.

A still further object of the invention is to provide locking means for each of the plow bottoms so that the respective plow bottom may be held down in operative position, means being employed in conjunction with such locking means, upon energization of the mentioned lifting means, so that initial movement under the influence of such lifting means will release the locking means.

It is still an additional object of the invention to provide means for locking the descending plow bottom in operative position under influence 2 of the iinal portion of the downward movement thereof.

An additional object of the invention is to provide a novel frame construction and arrangement for mounting plow bottoms so that they may be easily assembled upon said frame and may be easily adjusted from side to side with respect to one another.

It is also an object to provide a supporting frame whereby several different sizes of plow bottoms may be used, such as llo-inch, liz-inch, lli-inch, iti-inch, and 18-inch bottoms, merely by adjusting the respective plow beams as required, or by using appropriate beam-mounting means on the frame. A kindred object is to make it possible to use two-way plows with one or two bottoms on each side, thus providing, for example, a four-bottom two-way plow, or one-way plows with one, two, three, or four bottoms, for example.

This application is a continuation-in-part of my prior applications Serial No. 787,723, led November 24, 1947 (now abandoned), and Serial No. 44,483, led August 16, 1948 (now Patent No. 2,656,774).

Other objects, and the various features of the inventionwill become apparent to those skilled in this art upon reference to the following specication and the accompanying drawings wherein certain embodiments of the invention are illustrated.

in the drawings:

Fig. l is a side elevation of a two-way plow structure having two plow bottoms, portionsbeing broken away, one of the plow bottoms being in lowered, operative position and the other one in elevated, inoperative position, the unit being mounted upon the rear of a tractor provided with a conventional power lift device;

l'ig. 2 is principally a front elevation taken from the line 2-2 of Fig. l, some of the parts being indicated in section;

Fig. 3 is a vertical sectional detail taken on the line 3-3 of Fig. 2;

Fig. l is a fragmentary, transverse elevation approximately as indicated by the line 4--4 of Fig. 1 and showing a throw-bolt arrangement and means for its operation;

Fig. 5 is a horizontal section and plan View taken approximately from the line 5 5 of Fig. l;

Fig. 6 is a fragmentary, vertical section taken on the line 5 6 of Fig. 2;

Fig. '7 is a front elevation similar to that of Fig. 2 illustrating the plow beams and their supporting and operating parts in outer positions of adjustment such as might be used when the plow bottoms are interchanged for ridging, or when two bottoms are employed on each plow beam at each side of the device in a four-bottom construction;

Fig. 8 is a fragmentary, horizontal detail showing a structure for mounting two plow bottoms at each side of the device in a four-bottom structure;

Fig. 9 is a side elevation similar to that of Fig. l and showing a slightly modified arrangement of some of the parts;

Fig. 10 is a fragmentary detail disclosing the structure at the forward end of the plow beam for pivoting the latter upon its mounting;

Figs. ll and 12 are elevational details similar to that of 4i showing two positions of a modified throw-bolt arrangement;

Fig. 13 is a side elevation similar to that of Fig. 1 showing a slightly modified form of construction;

Fig. 14 is a principally a rea-r elevation taken from the line id-ili of 13;

Fig. 15 is a vertical sectional detail taken from the line IE--E 5 of Fig. 13 showing another throwbolt arrangement;

Fig. 16 is a fragmentary side elevation, as indicated by the line i--iii of Fig. lll, this view being taken from the side opposite that of Fig. 13;

Fig. 17 is a fragment of the structure of Fig. i6 indicating a different operative position; and

Fig. 18. is a transverse section taken on the line ll-lof Fig. 16.

Each of the forms of construction illustrated in the drawings comprises principally: an upstanding, rectangular frame, generally indicated at B, which substitutes for the so-called A-frarne frequently employed with this type of equipment; a plow assembly generally designated at P and comprising two counterbalanced, oppositely pitched plow bottoms; a power lift mechanism generally indicated at L and carried by the rearward end of a tractor generally represented at T; and an actuating and control linkage generally indicated at C.

The frame B is supported at its lower end by a pair of spaced lifting arms 2@ whose forward ends are pivotally attached by appropriate pivots 2l to the lower side portions of a rear housing 22 constituting a portion of the body of the tractor T. The rearward ends of the lifting arms 20 receive the ends of stub shafts 23 which laterally project from the lower side portions of the frame B, this assembly being maintained by cotter keys, or otherwise as desired. The lifting arms 2li are controlled by lift rods 2.4. which are actuated by crank arms 2li-through the medium of universal joints said arms being conventionally affixed to and actuated by a bell crank shaft 2l which projects through an upper portion of the tractor housing 22 and is in turn operated by hydraulic mechanism (not shown) contained within the housing 22. The crank arms 25, the shaft 2T! to whose opposite ends the arms 25 are attached, and the hydraulic apparatus within the housing 22 comprise the power lift L which is a well known construction forming no part of this invention` and, therefore, will not be further disclosed. The upper end of the frame B is maintained in a required vertical position through the medium of a positioning bar connected at its rearward end to an upper portion of the frame B as by a pivot bolt 3 l, the opposite end of the bar 30 being connected to the housingl 22 of the tractor T by means of a triangular plate 32 having a lower corner mounted by a pivot 33 upon the housing 22. The rearward upper corner of the plate 32 is pivotally connected with the forward end of the positioning bar 30 and the other upper corner of the plate 32 is pivotally connected with a power lift control rod 3@ which extends forward into an upper continuation of the housing 22 (not shown) where it serves to regulate flow of hydraulic power fluid to the power lift L in a well known manner.

The form of frame B illustrated comprises two opposed, vertically positioned side members 35 whose lower extremities carry the stub shafts 23 by which the frame B is supported upon the lifting arms 2li. The upper ends of the side members 35 are connected by a top cross bar or lock bar 35a which also constitutes the top of the frame B in this form, and in a form of frame like that of Figs. 13 and 14 a bottom crossbar Siib may be employed. Extending transversely of the frame B at the lower ends of the side members 35 is secured a lower horizontal mounting shaft 3S, and above the shaft 3B a short distance is a second horizontal mounting shaft 31, the ends of the shafts 36 and 3l being aflixed to the side members 35. The mounting shafts 3S and 37 serve to mount the forward ends of two spaced plow beams 38, this being accomplished through the medium of a plurality of mounting devices generally indicated at 39 and presently to be described.

The rearward ends of the plow beams 38 carry conventional plow bottoms 40 secured thereto in any conventional manner and respectively pitched in opposite directions. Thus, two oppositely. disposed plow units are provided so that, when the plow structure P is being drawn in a given direction, one plow bottom 40 will turn a furrow to one side and the other plow bottom it will turn a furrow to the other side, according to which plow unit is raised and which plow unit is lowered. The bottoms 40 are also adapted for lowering at the same time so that they may function simultaneously and produce a ditch as they are drawn forward, or a ridge or dike when properly pitched.

For the purpose of lowering one plow bottom while the other is being raised, the two plow bottoms 4E! are interconnected by a flexible cable 5| whose ends are appropriately engaged, preferably adjustably, in eyes 42 provided on rearward portions of the respective plow beams 38, the middle portion of the cable 4| passing through a pulley i3 carried upon a post 44 or similar mounting which is removably retained in a socket 45 or the like fixed on the middle of the top cross bar 35a of the frame B, and rigidly secured thereto and to the ears Bia, which position the rearward end of the positioning bar 36. By detaching the post 44 from the socket 45 or equivalent mounting, both plow bottoms i0 may be lowered for ditching'purposes. To provide for adjustment of the length of the cable #ll as may be required, at least one end of the cable is provided with a removable or adjustable clamp device 46.

For the purpose of mounting the plow bottoms 40 so that they may be raised and lowered, the forward ends of the plow beams 33 are provided with laterally projecting pivot pins 5G received in eyes 52 mounted on the ends of eye bolts 53. In the form illustrated, the pins 5) extend through wide hub ends 38a of the beams 33 (Figs. 5 and 1D) and the outer ends of the eyes 52 are closed to form sockets in which the ends of the pivot pins 5i)y are received. There being an eye bolt 53 `at each side `of each plow beam `38, several bolts `53 are required to be mounted for proper support of thetwo plow beams 38 and their plow bottoms 4l). For this purpose, four of the previously men.- tioned mounting devices 39 are employed and these are located in pairs for respectively receiving the eye bolts 53. Each device 39 is inthe form of a vertically disposed elongated block 54 having a vertical, slightly arcuate slot 55 (see Fig. 7) which receives the respective eye bolt 53. All of the blocks 54 may have slots 55 as indicated in Fig. 14 or the middle blocks 54, for example, may be without slots as generally indicated in Figs. 2 and 7, only the end blocks having slots 55. 'The ends of the eye bolts 53 are threaded and are adjustably bound in position in the slots 55 of the `blocks 54 by means of nuts 5t disposed on opposite sides of the blocks 5d. By shifting the eye bolts .53 in the slots .55 as indicated in Fig. 7, the plow beams 38 may be shifted about their axes and the pitch of the plow bottoms le varied as required. Similarly, the relative effective lengths of the eye bolts 53 between the blocks 54 and their eyes 52 may be adjusted through the nuts 5B to vary the angular direction of the plow `beams 33 as necessary. As best seen in Fig. 3, the blocks 54 of the mounting devices 39 have their upper and lower ends enlarged and bored `to provide eyes 5l which are snugly, but slidably, fitted upon the upper and lower mounting shafts 3l and 35 which are, in that ligure, illustrated as comprising outer sleeves on inner rods. These parts are assembled before the shafts and 3l are mounted on the frame B. The spacing of the two plow bottoms it from yeach other is readily accomplished by sliding the mounting blocks 54 along the shafts 36 and Si as required, and the pivot pins 50 of the plow beams 38 are readily positioned by shifting one of the blocks 54 of each `pair'with respect to the other. Properly adjusted positioning of the mounting blocks 54 is `maintained by means of set screws 5B which bind the respective eyes 5l upon the lower1 and upper mounting shafts 36 and 3l, as best illustrated in Fig. 3.`

.In order to lift the respective plow bottoms 40, each plow bottom is provided with a connecting `pull bar llili whose lower and rearward end is con# nected by a pivot pin -l to an ear 52 attached to a rearward portion of the respective plow beam 38. Each connecting pull bar El) may be a single `bar of fixed length as indicated in Fig, 1, or it may be in two sections adjustably connected as by bolts and slots as indicated at 63 in Fig. 13. The upper forward end of each connecting pull bar Si! is attached by a pivot pin 65 between ears Sila (Fig. 6) formed on rearward upper edge portions of a corresponding bifurcated swinging actuating arm 55 whose lower end is pivoted on the lower mounting shaft 36 by means of a transversely positioned hub lit. Thus, these swinging arms B5 position the forward ends of the respective pull bars 4lil) and also serve to actuate the bars i through their pivot pins M and to control the positions of the plow beams 3d.

When one plow bottom lid is in its lowered, operative position as seen in Fig. i, the rearward edge portions of the upper end of` its swinging actuating arm '55 engage against the` forward edge of the top bar 35a of the frame B, or in the form of Fig. 13 against the forward face of a transverse retention bar or lock bar 68 positioned in the frame B below the top bar 35a. Each swinging arm 65 is held by alatch le mounted upon a pivot pin 1l between the ,upperendsof 6 the bifurcations of the respective arm E5. The rearward end of each latch l!) has an overhanging hook or latch nger 'Ilia (Figs. 1, 6 and 9), this finger maintaining the locking relationship of the latch 'It with the lock bar 35a or 68. Since the ends of the lock bar 35a or t8 are rigidly secured to the side members 35 of the frame B, each latch 'lli restrains the respective parts and insures proper penetration of the respective plow bottom 40 into the soil. Moreover, since each pull bar tu is rigid, it also serves as a brace bar which prevents upward swinging movement of the respective beam 3B and its plow bottom 40 during plowing and so long as the latch l0 is in locking position. p i

As best indicated in Figs. 2 and 5, each swinging arm 55 is disposed substantially in the same vertical plane as the respective plow beam 38 by reas son of the fact that the respective hub `tt is positioned between and fills the space between the lower eyes 5l of the respective pair of mounting blocks 54 carried on the upper and lower mounting shafts 3l and 3G.

Each swinging actuating arm '55 is `directlyor indirectly connected with a pull link l2 which may be a flexible cable having terminal pieces or clevises 12a as in the form of Figs. 1 to 9, or a bar as in the form of Figs. 13 to 18. The forward end of each pull link l2 is pivotally secured by a pivot pin 'i3 to a corresponding energizing and positioning arm lli, these parts comprising together with the swinging arm `t5 and its connecting pull bar de the principal members of the actuating and control linkage C above mentioned. The upper ends of the positioning arms 'M for the two pull links l2 of each form are mounted upon a transverse shaft if carried in the upper ends of brackets 'it bolted or otherwise secured at their forward edges to the adjacent rear housing of the tractor T, such attachment being generally indicated at Ti. in 'the form of Figs. 13 to spacers '18 are mounted upon the outer ends of the shaft l5 and these may be relied. upon for lateral adjustment of the respective positioning arm 'lei and the bar-type pull link in accordance with lateral adjustment of the mounting blocks 5d on the mounting shafts te and 3l to vary the spacing of the plow` beams and their 'plow bottoms liti. With the cable-type link "i2 of Figs. i to 12, such adjustment is not required.

Raising of the lowered plow bottom 4D from its operating position as illustrated in Fig. 1, while permitting lowering of the elevated plow bottom d0 through the counterbalancing action of the cable 4l, is eected by the raising of the frame B through the agency of the lift rods` 24 and the lifting arms 2b when the bell crank shaft 2l and the crank arms 25 are hydraulically actuated under the control of the tractor driver by conventional means in the rear housing 22 connected with the lower lift mechanism L. Thus, as the `frame B is raised by elevation of the rearward ends of the lifting arms 20, the connection of the swinging actuating arm 65 for the lowered plow bottom le with the respective pull link 'l2 acts to pull the upper and rearward end of such pull link 12 upward and thereby swing the respective positioning arm 'It about its pivotal mounting on the transverse shaft l5 without producing any lifting effect upon the respective plow bottom 40 unless the respective arm 'Ul` is restrained. On the other hand, when the elevated plow bottom 4l) is descending while the frame B is being raised, it is necessary that its pull link l?. and` positioning arm 14 be permitted to. more.

Vsre'a'iiisoo 'In order tov care for these selective movements, a `draw or throw bolt 80, best illustrated in Fig. 4, is transversely mounted in the lower portions of the brackets 16 so that its ends may be selectively slid laterally into the path of the lower end of the respective positioning arms 14 and out of the path of the other arm 14. Sliding movement of the draw bolt 80 is limited by an apertured lug 8| xed on the middle portion thereof and positioned so that the end of the draw bolt 80 being drawn from the path of one of the arms 14 is not entirely withdrawn from its seat in the respective bracket 16, as illustrated. Means are provided for the purpose of shifting the draw bolt 80, and, in the form shown in Figs. 1, 4, and 5, this includes an eye 82 xed on the middle of the shaft 15 and receiving a shift lever 83 whose lower end is pivoted in the lug 8| and whose upper end lies within reach of the tractor operator.

In the form of Figs. 13 to 15, a sleeve and eye combination 81a limits the throw of the bolt 80, and cables 83a, guided 'cy eyes 84 on the brackets 16, extend to a, position convenient to the operator of the tractor so that he may pull the respective cable 83a. Thus, by either device, the operator may shift the draw bolt 80 into the path of that positioning arm 14 whose movement is to be prevented.

According to the form of construction of Figs. 13 to 18, each bar-type pull link "|2 is directly connected by a pin (as presently to -be described) to the respective swinging, actuating arm 65.

According to the forms of Figs. 1 to 9, each cable-type or flexible pull link 18 is connected to its swinging, actuating arm 65 through attachment of the respective terminal piece 12a of such link 12 to the lower end of a latch-operating control lever or control arm 85 which is fulcrumed between the members of such control arm 65 by a fulcrum pin 86. The upper end of the fulcrumed actuating arm 85 engages and actuates a depending heel or shoulder portion 81 on the bottom of the forward end of the latch 18.

As best seen in Fig. 6, the lower part of the latch providing the heel or shoulder portion 81 may be in the form of a downwardly opening socket providing a forward shoulder portion 81a opposed to the portion 81, such socket receiving the upper end of the latch-operating lever arm 85. A stop 88 is disposed between and secured to the members of each swinging, actuating arm 65 and across the back of the intervening space behind the upper end of the control arm 85 for engagement by the latter. Thus, when elevationof the frame B by the power lift L causes a flexible link 12 to exert draft upon the lower end of the respective lever arm or control arm 85, pressure ofy the upper end thereof on the shoulder portion 81 rst causes the latch 10 to swing on its pivot pin 1| and lift the hook or latch nger a from its locked position behind the top, retainingcrossbar or lock bar 35a. Immediately thereafter the upper portion of the control arm 85 strikes the stop 88, and, as a consequence further pull by the pull link 12 transmitted through the pivot pin 88 and the control arm: 85, causes the respective swinging, actuating arm 65 toswing downward from the full line position in Fig. 1 to the inclined position illustrated', thereby elevating the respective plow bottom 40 by way of its connecting pull bar 60. Fig. 9 discloses a somewhat modied arrangement of each connectingbar 68 and itsswinging, actuating arm 65, in that the spaced members or the actuating arm 65 are extendedv well abovethe top crossbar 35a of the frame B so that the upper, forward end of the connecting bar 60 and its attaching pivot pin 64 are disposed above the top bar 35a. Also, the lower, rearward end of the connecting bar 6I), its p-ivot pin 6| and corresponding ears 82 are positioned far enough rearward so that during raising and lowering operations the connecting bar 68 always rides above the top crossbar 35a. This figure also illustrates the latch 18 as having on its heel portion only the rearward shoulder portion 81 lying below its pivot pin 1|. Also in this particular instance, the stop 88 is shown as being disposed behind the heel or shoulder portion 81 rather than behind the upper end of the actuating arm 65. To insure return of the parts G5 and 10 to latching position, the latch 10 may be gravityloaded orA spring-loaded; or in the case of the form of Fig. 6, the lever control arm may be spring loaded.

Having reference to the form of Figs. 13 to 16, the rearward and upper end of the bar-type pull link 12 is in each instance provided with an elongated lost-motion slot 98 which receives a transverse guiding and actuating pin 9| carried by the spaced members of the respective swinging actuating arm 65. Upon one end of the pin 9| there is pivotally mounted adjacent the pull link 12 the lower end of a latch-operating control arm 92 (which corresponds generally with the fulcrumed control arm 85 of the other form), the upper end of the control arm 92 being attached by a pivot pin 93 to a forward heel portion of the respective latch 18 at a position forward of the upper end of the respective swinging arm 65. (It will be noted that the viewi of Fig. 13 and the views of Figs. 16 and 17 are from opposite sides of the described arm structure.) Inasmuch as each latch-operating arm 92 must be moved up and down for the purpose of actuating its latch 18, the necessary guided movement is provided by angularly positioned arcuate slots 94 formed in both spaced members or bifurcations of the respective swinging arm 65, as best seen in Figs. 16 and 17. In order that the movement of each actuating pin 9| in its slots 94 may be properly guided, a short block 95 is in each instance provided between the members of the respective swinging actuating arm 65, and each block 95 is mounted upon a pivot 98 located at the center about which the arcs of the slots 94 are described. Thus. as the actuating pins 9| move in the slots 94, the blocks 95 insure against any tendency to bind. Axial shift of the pins 9| is prevented by any appropriate means, such as the indicated head at one end of each pin and the cotter key at the other end.

From the foregoing, it will be apparent that, when the frame B of the form of Figs. 13 to 18 is being elevated and the respective pin 9| is brought to the rear end of the respective slot in the corresponding pull link 12, there is a resultant draft upon the respective pin 9| causing it to move downward in its slot 94. Such downward movement pulls the respective latchoperating arm 92 downward and rocks the respective latch 10 about its pivot pin 1|, thereby withdrawing the respective latch nnger 18a from behind the lock bar (i8l so as to release the swinging arm 65 from the lock bar 68. As a consequence, further elevation of the frame B under the influence of the lift rods 2K1 and the lifting arms 20 causes draft to be transferred through the respective pin 9| to the corresponding swinging arm 65, whereby the lowered plow bottom 40 is elevated by means of the respective pull bar 60. Such elevation of the lowered plow bottom 40, of course, requires that the draw bolt 8U be previously moved into position to block swinging movement of the respective positioning arm 'M as hereinbefore described. In order properly to align the latch-operating arm 92, its pivot pin 93 is mounted in a laterally offset boss 91 integral with the heel of the respective latch 10. Each arm 92 may be loaded by a spring S8 (Fig. 13) for automatic return thereof and of its latch 1U.

Thus, as the frame B of the form of Figs. 13 to 18 is elevated through the medium of the lifting arms 20 and the lift rods 24 by the power lift L,

the draw bolt 80 being in operative position as respective swinging arm 65 will be moved from its upright position toward the lowered position seen at the left of Fig. 13, and the plow beam 33` for the respective plow bottom 4|] will be elevated through the medium of the respective connecting pull bar 50.

With all forms disclosed, at the same time that the one plow bottom 40 is raised, the other plow bottom 4Q will have descended by gravity in synchronism with the elevation of the one plow bottom by reason of the counterbalancing cable 4|. In practice, the last portion of the descent of the plow bottom which is being lowered takes place solely under inuence of gravity, and without the necessity for further elevation of the frame B and consequent pull by the respective pull link l2, such iinal portion of the descent occurring by reason of the overbalancing of the descending plow bottom near the end of its movement, the center of gravity of the ascending plow bottom then moving in close to the vertical plane of the point of support provided by the pivot pin 5E! and eyes 52.

The location of the draw bolt iii) as seen in Fig. 1 is such as to provide for a limited amount of swinging movement of the respective positioning arms M from their most forward position and during initial elevation of the frame B as the lower plow is being withdrawn from the soil. However, should itbe desired to eliminate such lost motion for any purpose, a hole 99 is provided in the respective bracket "I6 just behind the forwardrnost position of the respective positioning arm l, and such hole 99 may receive any type of locking pin corresponding in general nature to the bolt 8G, for example.

In Figs. l1 and 12 there are shown two positions of a modified form of the draw bolt or throw bolt Bil and its actuating means, and here, as in the other forms, the bolt 3D is mounted to slide in spaced brackets 16 for the purpose of controlling the positioning arms 14. Upon the bolt Bil adjacent one end an upstanding finger IBB is fixed. A spring disposed about an enlarged portion of the bolt Bil bears at one end against the finger Hit and at its other end against the opposite bracket 16. Sliding lmovement to and fro lis limited in one direction by the iinger |00 and in the other direction by the end |02 of the enlarged portion of the bolt 89. The bolt is shifted through the medium of a Bowden wire |04 fixed to the upper end of the finger |00 and extending through one of the brackets 1B into its housing |85 and thence to a convenient location within reach of the tractor operator. The Bowden wire is located forward of the respective positioning arm 'i4 to avoid interference with the movements of the latter. With this arrangement, the spring Idil normally projects the bolt to the position of Fig. 11; when it is desired to control the opposite positioning arm M, draft by the tractor operator upon the Bowden wire shifts the bolt 80 to the position of Fig. 12 where it remains so long as the operator maintains draft upon the wire.

In Fig. 8 there is shown a construction by which two plow bottoms may be mounted upon each side of the plowing structure, whereby to provide a four-bottom plow. Here, the same eye bolts 53 as in the other forms are mounted in the mounting blocks 5ft carried by the transverse supporting rods 35 and 37 in the frame 35. The pivot pin bild on the respective plow beam in each instance corresponds with the pivot pin 5|] seen in Figs. 5 and 1G, its ends being mounted in the eyes 52 of the eye bolts 5t. rihis pivot pin 50a extends through an appropriately elongated hub member il@ corresponding with the hubs 38a of the other forms, the hub member Ill being welded or otherwise rigidly secured to the forward edge portion of a relatively heavy, elongated attachment plate H2 to the ends of which there are bolted a long inside beam |38 and a short outside beam 23B, both of which carry appropriate plow bottoms. Thus, by shifting the mounting blocks 55| to positions corresponding with those of Fig. 7 or positions intermediate those of Figs. 'l and 14, four plow bottoms arranged in pairs `may be operatively located, the pairs being raised and lowered in the same fashion as the single plow bottoms of the other forms. Attachment of the beams |38 and 23S to the corresponding mounting plate i i2 is effected as by means of bolts l I4. If desired, the outer end of each plate l I2 may be formed with two sets of bolt-receiving holes H5 so that the spacing between the two beams |38 and 238 may be varied as desired. For example, such spacing might be twelve inches when the inner holes I5 are used and fourteen inches when the outer holes ||5 are used. By these means, plow bottoms of different sizes, such as 10, 12, 14, 15, and 18 inch bottoms, may be used as desired. These various bottoms may be arranged for use as two-way plows, or as one-way plows when all beams are lowered at the same time and the bottoms are all pitched in the same direction. Also, one, two, three, or four bottoms may be used, as desired, by employing corresponding beam mountings, and for either one` way or two-way operation. In view of the slid-` able adjustability of the mounting blocks 51|,` such arrangements may be readily accomplislfied` when using appropriate beams and plow bottoms.

Operation,

83 or cable 83a or wire l'll4 to locate the correspendingy end` of the draw bolt 65 in position behindthe respective positioning arm l. Thev tractor dri-ver then operates the manual control for the power lift mechanism L so'that the lift rods 24 and the lifting arms 25 function to elevate the upstanding frame B. In view of the location of the pivot pins "53 at the. forward and lower ends of the pull links l2, the tendency is for these pivot. pins 'i3 and the positioning arms 14 to swing rearward about their mountings on the transverse pivot shaft l5. However, one end of the draw bolt 80 will have been moved behind that positioning arm T4 connected with the pull link 'I2 of the lowered plow bottom 4l). As a consequence, such pull link 12 is held against longitudinal movement so that elevation of the frame Bv results in pulling of the respective actuating arm 65 forward from the upright position seen in Figs. l, 9, and 13 to the lower position seen in such figures.

In the case of the construction of Figs. 1 to 10, the frst effect of the respective pull link l2 is to move forward the lower end of the operating control lever 85 so that the upper end thereof is swung rearward against the shoulder portion 81 of the latch 'l0 to lift the latch finger or hook a from its locking position behind the top crossbar 35a. After ther lifting of such hook from its locking position, the upper end of the control lever 85 strikes the stop til so that the continued pulling effect of the pull link l2 acts to'swing the actuating arm 65 about its pivotal mounting on the lower transverse supporting shaft 36, thereby raising the lowered plow bottom 40 to its upper position, suchraising being effected through the connecting pull bar til.

In the structure of Figs. 13 to i8, the slot 90 of each bar-type pull link 12' rides along its actuating pin Sl until the latter reaches the outer end of the slot 96. Thereupon, initial draft of the pull link 12: upon the actuating pin 9i causes the latter tomove downward in the slots 94 in spaced members of the respective swinging arm 65 and. thereby pull downward the latch-operat ing arm 92 and as a consequence rock the respective latch 'm about its pivot pin ll and withdraw the overhanging hook or latch linger ma from behind the lock bar 68, thereby releasing the top of the respective swinging arm 55 from the frame B. Continued elevation of the frame B causes continued draft upon such actuating pin S-I and the respective swinging arm 65 so that the upper end of the latter is gradually pulled downward from its upright position into the lower position illustrated in Fig. 13.

With all forms, sincethe plow bottoms are counterbalanced, only aA small weight is required to be lifted by a pull link and, therefore, only a limited pull is exerted through the respective pull 12. Meanwhile, the other plow bottom will'. have. been allowed to descend through the medium of the oounterbalancing cable 4|, and its swinging actuating arm 65 and latch l0 will have risen. As previously indicated, the last of the plow change will be rather rapid due to the gravity effects produced by the overbalancing of the descending plow bottom 46. Thus, ordinarily, it will be unnecessary to pull the actuated swinging arm 65 all the way down to the illustrated lower position which it assumes. Since the rising swinging arm 65 is not under control of its pull link 12 and positioning arm 14, by reason of the fact that the respective end of the draw bolt 8'0 does not project into the path of' such arm 14, such swinging arm 65 is returned freely to its upright position as its plow bottom 45 descends. latch 'I0 over the top bar 35a or lock bar 68, each latch 10 or its operating arm 85 or 92 is gravityloaded or spring-loaded as by the spring 58 in dicated in Fig. 13. When it is again desired to reverse the position of the plow bottoms 40, the draw bolt is shifted in the opposite direction, and as a consequence, actuation of the power lift L will reverse the above-described operation.

However, should it be not desired to change the plows on any given excursion of the frame B, the draw bolt will remain or will be placed in itsl position of the preceding operation. Thus, the link l2 and arm 14 of the lowered plow bottom will not be energized, and the other link 12 will not be effective because its plow bottom is already in raised position.

In all forms of the invention herein disclosed,k

the two mounting shafts 36 and 3l and the slidable mounting blocks 54 provide for effects not heretofore possible in two-way plow structures, and as a consequence they impart much greater flexibility in such devices than heretofore possible. More specifically, these mounting shafts and blocks make it possible to adjust in the field the relative positions of the plow bottoms for whatever purpose, and they also make it simple to replace the plow bottoms with those of larger or smaller dimensions, or of different pitch.

Thus, by loosening the nuts 56 on the eye bolts 53, the bolts may be moved up or down in the arcuate slots 55 for the purpose of levelling the plow bottoms to accord with given plowing conditions. Also, the nuts 56 may be adjusted along the eye bolts 53 to vary the effective lengths of the eye bolts of each pair so as to changey the position of the toe or point of the respective plow bottom and thereby change the lead to shift the point to the right or left and thereby correct for over or under cutting, and consequently adjust side draft. Again, upon loosening of the set screws 58 of the respective mounting blocks 54, the blocks may be slid along the shafts 36 and 3l either for the purpose of spacing the'bottoms already installed, or for replacing them with wider or narrower bottoms. Thus, with the present improvement, various widths of plow bottoms from ten inches to eighteen inches in width, or greater, may be used. In a structure adapted for maximum plow bottomr widths of eighteen inches, the inner block 54 of each pair will be shifted over approximately to the median line of the frame B, and the respective plow bottoms 46 installed as previously described. If sixteen-inch plow bottoms are used, the blocks are shifted so that the inner block of each pair is located about two inches outward from the middle along the shafts 36 and 31, and in the case of ten-inch plow bottoms the blocks might be shifted outward as much as eight inches from the middle. All of these adjustments are quickly accomplished with the mountings of the present improvement.

Such easy adjustment with the plow bottom mountings also makes it possible to eliminate the common shifting of tractor Wheels to vary the tread when two-way plows are to be used. As is familiar to every tractor and plow operator, the moving or reversing of tires and wheels on tractors to accommodate different plows is a very tedious operation, especially when it is considered that in many tractors the wheels are heavily loaded and may weigh. as much asl 1,000y pounds To insure engagement of the respectiveA 13 apiece. It is therefore a great advantage to be able to avoid this heavy work merely by loosening the set screws 58 and sliding the plow beams along the shafts 36 and 31 to required positions.

In connection with the above-mentioned adjustment of the lead of the points of the plow bottoms, such adjustments by shifting of the nuts 55 on the eye bolts 53 are quickly accomplished in the eld. If the given plow bottom is cutting too narrow a swath, the shifting of the point of the plow bottom is thus quickly attained, thereby presenting a greater width of effective cutting edge to the soil. Again, if the plow bottom is over-cutting, and thereby causing excessive side thrust or side draft to be exerted against the plow bottom, its point may be easily shifted to reduce the cut. Similarly, the plow bottoms may be quickly levelled by raising or lowering the eye bolts in their slots 55. By reason of the fact that the mounting blocks Se may themselves be adjusted to shift the plow beams 33 and their plow bottoms, this avoids the necessity for attempting to accomplish similar results by excessive adjustment of the lead of the plow points. Also, the plow beams may be easily brought together, when they are both lowered for ditching purposes.

Further, as illustrated in Fig. 7, each plow beam may be easily shifted along the transverse, supporting shafts 3S and 3l, by means of the adjustable mounting blocks t, to provide for proper spacing when the plow bottoms are interchanged to form ridges or dises. Moreover, by means of the structure of Fig. 8, each plow beam 38 and plow bottom llt of the other forms may be replaced with a long inner beam ist and a short outer beam 23S which are provided with plow bottoms that are out of line transversely, as well as longitudinally, whereby to turn two furrows simultaneously. The other plow bottom arrangements previously described are also easily accomplished by similar' rearrangements and adjustments.

From the foregoing, it will be apparent that the present construction of the frame B makes it possible to employ a single frame structure for many different plow bottoms and many different positions thereof, and also eliminates the necessity for reversing the tires and wheels of a tractor when changing from one type or sise of plow to another.

I claim as my invention:`

l. In a two-way plow: plow beams respectively carrying oppositely pitched plow bottoms and adapted to be simultaneously and lowered; a frame upon which beams are swingingly `mounted for ver ical movement of said plow bottoms; means for supporting said frame and plow bottoms upon a tractor for automatic raising and lowering ci the frame and plow bottoms as a unit by a power lift on the tractor; bracket means adapted to be mounted upon the tractor below said power lift; swinging arms mounted upon the lower portion. of frame. there being a swinging' arm :tor plow beam; con.- necting means connecting the rearward po of each plow beam with an upper portion oi respective swinging arm; actuating linkage includng a pull link, for each swinging arm, a posi oning arm for each pull link, the rearward end o pull lint` pivotal connection with the respective swinging arm, and the forward end of each pull link having pivotal connection with the respective positioning arm at one end, the opposite end of each positioning arm being pivotally mounted upon said bracket means; and shiftable means for selectively controlling the respective positioning arm for selective actuation of the respective plow beam and plow bottom.

2. A two-way plow as in claim l wherein said shiftable means is a transversely disposed bolt mounted in said bracket means, the ends of said bolt being adapted to be disposed selectively in back of the swinging ends of said positioning arms.

3. In combination in an earthworking structure: shiftable earthworking means; carrying means for said earthworking means; an upstanding frame upon which said carrying means is mounted; means for supporting said frame and earthworking means upon a tractor for automatic raising and lowering of the frame by a power lift on the tractor; control linkage means for the earthworking means and connected to move such earthworliing means from one position to another; actuating means for said control linkage means; movable energizing means for said actuating means; and, means in the form of a transversely disposed draw bolt to be mounted on said tractor and movable by the driver of said tractor into the path of said energizing means to restrain movement of said energizing means and said actuating means, and thereby render said actuating means effective to move said linkage means and said earthworliing means upon elevation of said frame by said power lift on the tractor.

4. In a two-way plow: plow beams respectively carrying oppositely pitched plow bottoms and adapted to be simultaneously raised and lowered; a frame upon which said beams are swingingly mounted for vertical movement of said plow beams; means for supporting said frame and plow beams upon raising and lowering means carried by a tractor provided with a power litt; swinging arms mounted upon the lower portion ci said frame, there being a swinging arm for each plow beam; means connecting each plow bottom and its beam with an upper portion of the respective swinging arm; an actuating linkage connected to each swinging arm and adapted for connection to said tractor for causing actuation of the respective swinging arm upon elevation of said frame; latch-operating arms pivoted respectively adjacent the sides of said swinging arms; latches respectively mounted upon said swinging arms; and means providing operative connections between said latches and said latch-operating arms, said linkages having operative connections with said latch-operating arms to actuate said latches, said frame providing retention means for engagement by said latches to lock the respecitve plow bottoms in lowered operative position.

5. A combination as in claim e wherein said latch-operating arms are pivotally attached toV the respective swinging arms and are operatively disposed with respect to said latches to un-V latch the latter from said retention means.

6. A combination as in claim 4 wherein said latches are provided with shoulder means and said latch-operating arms have means for engaging said shoulder means.

'7. In combination in an earthworking structure: an upstanding frame having engageable lock means on an upper portion thereof; means for supporting said frame upon a tractor for automatic raising and lowering thereof by a` power lift on the tractor; transverse supporting for carrying an earthworking tool thereon and movably mounted on said transverse supporting means; a swinging actuating arm mounted on said transverse supporting means; connecting means between said beam and said swinging actuating arm to move said beam by said arm; latch means mounted on the upper end of said swinging actuating arm and having retaining means to engage said engageable lock means on said frame; a latch-operating lever fulcrumed on said swinging actuating arm and having engagement at itsupper end with said latch means to unlatch said retaining means from said lock means; and a pull link connected at one end with a lower portion of said latch-operating lever and provided at its opposite end with means for connection with a lower portion of the tractor to swing said actuating arm, beam and tool upon elevation of Said frame by said power lit 8. In combination in a two-way earth working structure: shiftable earth working means for turning earth in opposite directions; means carrying said earth working means; a frame upon which said carrying means are mounted for elevation thereof; means for supporting said frame and earth working means upon a tractor for automatically raising and lowering the frame by a power lift on the tractor; control linkages for the respective earth working means and connected to move such means respectively to and from operative position; actuating means for each of said control linkages; control means, other than said power lift, for said actuating means; and means movable by the driver of the tractor into the paths of said control means for rendering said control means selectively operable.

9. A combination as in claim 8 wherein said means movable by said driver is a transversely disposed bolt mounted on said tractor and slidable transversely between extreme positions.

10. In combination in a tillage structure: a frame adapted to be held in an upright position; means for supporting said frame in such position by power lift means oi a tractor; a tool pivoted upon said frame to swing in a vertical plane; a swinging arm pivoted on said frame and having operative connection with said tool to elevate the same; lock means carried by said frame; latch means pivotally mounted upon said arm in position to cooperate with said lock means and having engaging means to engage said lock means for retention thereby; shoulder means carried by said latch means; actuating pull means adapted for operative connection adjacent one end with said tractor and atthe other end for releasable engagement with said shoulder means for moving said latch means and swinging arm to release said latch means from said lock means and move said swinging arm through the medium of said latch means to lift said tool; a swinging positioning arm to be mounted on a lower portion of said tractor in spaced position with respect to said power lift and movably attached to said pull means; and movable means to be carried on said tractor for selectively engaging and releasing said positioning arm to energize and de-energize said pull means.

1l. A combination in a tilling structure: a frame adapted to be supported in upright position by a power lift mechanism of a tractor; a tool beam carrying an earth-working tool and pivotally mounted upon said frame to swing in a vertical plane for raising and lowering thereof g a swinging arm pivotally mounted upon said 16 frame and having operative connection with said beam and tool for elevation thereof; lock means carried by said frame; latch means carried by said swinging arm and adapted to cooperate with said lock means for locking said beam and tool in operative position; pull means adapted to be connected to said tractor and having pivotal connection with said swinging arm; and latch-operating means connecting said pull means with said latch means, said pull meansA having a lost-motion connection with said latchoperating means.

l2. A combination in an earth-working structure: a frame adapted to be supported in upright position when carried by power lift mechanism of a tractor; mounted upon said frame for automatic raising and lowering with said frame by said power lift mechanism; a control linkage for said earthworking means and connected to move such earth-working means to and from operative position, said linkage being connected with said earth-working means; actuating means connected with said control linkage to operate the latter; energizing means, other than said power lift mechanism, for said actuating means; and means movable by a driver of the tractor into a path of movement of said energizing means for positioning said energizing means to control said actuating means.

13. In an earth-working structure to be carried by a tractor having a power-lift device for raising and lowering said structure bodily, lifting and supporting means on the tractor for movably supporting said structure, and elevator means connected with the power lift and the lifting means to elevate the latter, the combination of: frame means to be movably mounted on said lifting and supporting means for bodily raising and lowering thereof; earth-working tool means movably carried by said frame means and movable thereon between a lower earth-working position and an upper non-operating position; tool-moving means connected to said tool means to move the latter between said positions; pulllinkage means including plural pivotally connected members for disposition between a lower portion of said tractor and said tool-moving means; means for mounting said linkage means on said lower portion of said tractor, one of said linkage members being a swinging, energizing arm for effecting actuation of said tool-moving means through said linkage means upon elevation of said frame means with respect to said tractor; and throw means selectively movable to and from the path of said swinging arm to control movement thereof.

14. In combination in a two-way plow: an upstanding frame; means for supporting said frame upon a tractor for automatically raising and lowering said frame by a power lift on the tractor; plow beam means mounted upon a lower portion of said frame to swing thereon vertically;

oppositely pitched plow bottoms carried by said beam means; swinging arm means mounted upon said lower frame portion; means connecting the swinging arm. means with the respective plow bottoms to swing in unison therewith, such swinging arm means upstanding adjacent said frame when in operative position; pull link means operatively connected with said swinging arm means and adapted for connection with a lower portion of the tractor to pull on said swinging arm means as said frame is raised by said power lift; latch means carried by said swinging arm earth-working means movably.

means to engage retaining means on the upper portion of said frame when such swinging arm means is in said upstanding position; and latchoperating arm means for said swinging arm means and attached to said pull link means and operatively connected with said latch means for unlat-ching said latch means upon pull by said pull link means.

15. An earth-working device including in combination: frame i cans mountable on a vertically movable draft connection elevatable by power-lift mechanism of a draft vehicle; an earth-working tool having a forward portion movably mounted on said frame means; a control arm carried by said device and connected with said tool for moving the latter from one position to another; latch means mcvably carried by said control arm and engageable with catch means on said frame means to lock said tool in position; link. meins pivotally carried by said control arm and operatively connected with said latch means to actuate the latter; and pull linkage means connected 'to link means and provided with means for attachment to said draft vehicle at a point apart from attachment of said draft connection to said vehicle to move said tool upon elevation of said trarne means.

16. A combination as in claim 15 wherein said pull linkage means includes movable arm means attachable to said draft vehicle, and shiftable means to block movement ci said movable arm means and energize said pull-iii :age means.

17. In an earth-working structure to be car-- ricd by a tractor having a power-lift device for raising and lowering said structure bodily, lifting and supporting means on the tractor for movably supporting said structure, and elevator means connected with the power lift and the liftinG means to elevate the latter, the combination of: frame means to be inovably mounted on said lifting and supporting means for bodily raising and lowering thereof; earth-working tool means movably carried by said frame means and Inovable thereon between a lower earth-working position and an upper non-operating position; toolmoving means connected to said tool means to move the latter between said positions; `linkage means including plural pivotally connected members on said frame and disposed between a lower portion of said frame and said tool-moving means; means for connecting said linkage means with a lower portion of said frame, one of said linkage members being a swinging energizing arm for effecting actuation of said tool-moving means through said linkage means when said frame means is elevated with respect to said tractor; actuable means mounted on the tractor and actuable by a tractor driver to energize said arm for moving said tool means.

18. A combination as in claim 17 including latch means for said tool-moving means in position to engage said frame means, said linkage means having trip means in connection with said latch means to release the latter from said frame means through said linkage means upon operation of said acti-table means on the tractor for energizing said arm.

19. In an earth-working structure to be drawn and carried by a tractor having a power-lift device ior raising and lowering such structure bodily, the combination of earth-working tool means adapted to be moved between a lowered earthworking position and an elevated idle position; frame means movably carrying said tool means 18 and adapted to be movably mounted on said tractor for bodily raising and lowering with respect to said tractor, said frame means having a vertically extending upper portion; positioning connecting said upper portion oi' said trarne means with an upper portion. ci said tractor to maintain the position of said frame means; lifting arms rnovably supporting said trame means on said. tractor; elevator means connected with ls Ld lifting arms and adapted to be connected with said power-lift device for raising' said frame means and tool means as a unit by said powerlift device; operable means connected with said tool means for moving said tool means on said frame means between different positions; means l'oi' connecting a portion of said operable means at a position cn said tractor separate from said power lift for movement of said tool means on said frame means upon lifting of said frame means by said elevator means; and manually shit-table means associated with said operable means and movable between an operative and an inoperative position for controlling movement of said operable means.

20. A combination as in claim 19 wherein said eartlmvorking tool means includes two oppositely pitched plow bottoms movable selectively by said operable means between working and idle positions.

2l. e combination as in claim 19 including: latch n connecting said tool means with said frame ineens; and. trip means connected with said op e means for trippng said latch means by said operable means through lifting of said frame means by said power lift.

A, combination as in claim 19 wherein said oi erable means includes a pull link connected with said tractor.

23. A combination as in claim 22 wherein said operable means includes a lever for pivotal mounting on said tractor and connected with said pull link for connecting the pull link to the tractor.

2a. A combination as in claim 19 wherein said shiftable means is a swinging arm member.

25. A combination as in claim 19 wherein said operable means includes a lever mounted on the tractor.

26. In an earth-working structure to be drawn and carried by a tractor having a power-lift device for raising and lowering such structure bodily in a predetermined path, the combination of: earth-working tool means adapted to be moved between a lowered earth-working position and an elevated idle position; frame means movably carrying said tool means and adapted to be movably mounted on said tractor for bodily raising and lowering with respect to the tractor; lifting means niovably supporting said frame means on said tractor; elevator means connected with said lifting means and adapted for oonnection with said power-lift devi e for raising said frame means and tool means as a unit; operable means connected with said tool means for moving said tool means on said frame means between said working and idle positions; means for connecting a portion of said operable means at a relatively fixed position on said tractor for movement of said tool means on frame means upon lifting of said frame means by said lifting means; latch means for connecting said tool means with said frame means and actuable by said operable means to release the same by lifting of said frame means by said power-lift device; and manually shiftable control means apriranno adjacent said` operablemeans-and movable between an operableposition and anrinoperable position for controlling movementI of said operable means.

27. A combination as in claim 26- including a trip means connected. with said operable means and engageable with said latch means for.

tripping said latch means by said operable means. through .said lift of.said. frame means `.by said power-lift device.

28. In an earth-.workingstructure .to be drawn.

and'carried b'y aY tractorhavinga power-liftv device for raising and .lowering such.structureY bodily in a predetermined path, the combination of earth-working tool means.. adapted to be 15. moved between a ylowered.earth-working posi` tion and an elevatedv idle position;..frame means. movably. carrying said tool means and.Y adapted 1 to be movably mounted/on said ltractorfor bodily raisingand lowering. with respect to th'etractor; lifting means m'ovably. supporting said.. frameY means on said tractor; `elevator means -connected i withsaid lifting means andy adaptedffor. connection with said power-lift device for raisingsaid..

frame means and tool means asa unit; Aoperable meansconnected with said tool means. formoving'saiditoolmeans on said vframe means. be-

tweenY said working andi idle positions; means.

for connecting'a portion of "said operable means.v

at a relatively fixedv position on saidtractor for movement( of said tool` means on said framesaid `operable means, tripl means beingconnected with' said. operable means and engageable. with said latch means for trippingsaid.latchmeansA by said operablemeans to move saidtool means..

29. In a twofway. plow: plow. beam.. means carryingoppositely pitched plow bottoms adapted..

to besimultaneously raised and'lowered; frame neansiupon which saidbeam-.means are movably mounted; means for supporting saidtfra-me.A

means, beam means and plow bottoms.upon..a

tractorfor raising, and'lowering offsucliirame`v means; beam means and plow bottoms. asa-.unit

bypower2lif't".` means ofthe tractor; operable.

meansA for movingfthe plow.` bottoms between: operativeand inoperativepositions:onsaid fframe means; connectingmeans'mountedcon a lower; housing portion of,said.l tractor. and connected. to said operable means. for actuation-0fy theA latter; and means movable .by the driveriofthez tractor. l,and ...engaging `vsaid connecting means for.. operating said operable means upon actuating.. saidpower. lift tolift vsaid framemeans.

30. In.. combination.. in a two-way. plows. am upstandi'ng.. frame; Ameans for. supporting said.. frame .upon .a i tractor for automatically: raising.. and .loweringsaid Vframeby a: powerllift. .on-sthe. tractor," plow beam means .mounted upon a.-lower-. portion of said "frameto swingthereonvertically.; oppositely/ pitched plow bottoms carried by said.. beam means; swinging arm... means mounted,l upon saidv lowerframe portion.; meansconnectsing, the swinging arm means `with the .respecttive .plow bottoms to swing in v.unison therewith., such' swinging, arm means upstanding adjacent.. said iframe when in operative position; pull lin-k. means operatively connected with eachswingf'# ing` arm means; positioning means adaptedl.

to .be mounted on said tractor, forward .portions 1 of `r"saidlpull link` means beingpositioned 'by said positioning means; and means to. be mounted fon. said tractorandishiftable'by an operator of said" tractor torestrain said' pull link means selectively,

= wherebyto' exert draft 4upon therespective. swing-- ing uarm' means Aand raise its plow bottom upon. elevation'of "said frameibythe' power lift onlthey tractor;

WILLIAM EISK" References osea 1 in 1me Vque' of enemies-vfA UNITED SIA'IES PATENTS- Number"- Name Datei: Re. 23,098 Rogers:. ..Apr...12,. 1949il 267,630 Witt- ;..Nov. .14, .1882-A 341250 Kimmel: .May 4, 188131.` 1,172,082.v Wakeeld liebixl,.1916.l 1,303,427l Wallace .Mai/13, 1919.: 1,318,036 Wakeeld Oct. '1, 1919. 1,373,613. Heider Apr. 5, 1921. 1,375,457 Heider Apr.l9; 1921.. 2,437,879- Eerguson .Mar. 16,1948;l 2,457,163.. Lansing.; Decaf 28, ..1948 2,474,731 Evans .Junew28, .1949. 2,529,809. Mellen` Y.Nov.-.14=; 1950.; 2,575,428.` Rogers Nov; 20,1951..

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