claim: I @ In combination with a tractor,, a tractor-.uicunted cultivator comprising a transverse. tool bar secured to, said tractor adjacent one. end thereof. and extending laterajly thereftom, a lift arm carried by said tool bar 15 and: rockable about@ an axis transverse to the direction of travel of the tractor, an up-wardly extending. standard rigidly secured to said tool bar adjacent said lift arm, a toggle linkage connected with said lift arm and, with said@upwardly extending standard- at a point spaced above 20 said transverse tool,bar, an acttiating link pivotany connected to said toggle linkage adjacent tile apex thereof, a transverse rock shaft c-arried by said tractor,,said rock shaft having @ formed thereon a rock. arm, power transrnitting, means carried by said tractor j'or rocking said 25 rock shaft in one direction, pivot meatls for connecting said rock arm to ' said actuating link wherein upon said rock. shaft's being rocked in said one direction, said toggle linka-,e is caused to buckle sufficiently to swing said lift arm wardly from a -working position to a30 UP transport position. 2., In combination with a tractor, a tractor-mounted cultivator comprising a transverse tool bar secured to said I.ractor adjacent one e-nd thereof and extending laterally therefrom, @ a lift arm carried, by sa'Ld tool bar 35 and rockable about the axis thereof, an upwardly extending standard r:gidly seellired to said tool bar adI jacent said lift arm, a, toggle linkage connected with said lift arm and with said upwardly extending. standard at a point spaced above said transverse tool bar, an 40, actuating link pivotally connected to said toggle linkage adjacent the apex thereof a transverse rock shaft carried by sa;d tractor, said r@ck shaft having formed thereon a rock arin, power operated means connected with said tractor and carried by said tool bar for rockin.- 4,5 said rock shaft in one direction, pivot means for tonnecting said rock arm to said actuating link wherein upon said rock shaft's being rocked in said one direction, said toggle linka-,e is caused, to buckle sufficiently to snving said Ifft arm upwardly froni a working posi7 50, tion to a transport position., 3. In combination with a tractor, a tractor-mounted cul@Livator coniprising a transverse tool bar sectired to said tractor adjacent one end thereof and extendina laterally therei'roini a lift arm carried by said, tool bar 55 and rockable about the axis ' hereof, an upwardly exteiiding standard rigidly secured to said too'. - baradjacent said lift arm, a to,@@le linkage connected between said lift arm -.nd said upwardly exter@ding standard at a poiw, spaced substantially upward from said transverse Go tool bar, an actuating link pivotally connected to said toggle I;qkage adjacent the apex thereof, a transverse rock shaft carried by said tractor, said rock shaft having formed thereon a rock arw., poiver operate means connected vvith said tractor and carried by said tool bar 65 for rocking said rock shaft in one direction, @pivot means for connecting said rock arm to said actuating link ,%,.Iierein -,ipon said rock shaffs -being rocked- in said one direction, said toggle linkage is caused . to buckle sufficiently to swi--tig said lift arm upwardly from a @N,ork70 ing posilion to a transport position, said toggle linkage being in longitudinal alignment when said lift arm is in working pbsition. 4. In combination with a tractor, a@@ tractormounted@ cultivator con-iprising@ a transverse tool bar secured to 75 said tractor 4dj4cent one, end- thercof an4 6xtendijig, laterally t4crefrorii,,,a lift arin. carri,d@ by: said tool bar and@ rockable about airt axis trans@verse to tlie@ directioii of travel of said tractor, an upwardly extendin-@standard rigidly secured t6 said tool bar adjacent said lift arm, a- rockable member pivotally $ectired to said @itandard at a point@ slibstantially above said transverse to(I bar and rockable out an axis par to t axis o sai tool bar and vertically dispose with respect, thereto, an interconnecting, means between said rockable riember and sa;d standard for rocking said ro6kable.- member with respect thereto, and for holding said rockable meniber in variou@ angular. positioi@s with respect thereto, a toggle Unkage.,interconnected betnveensaid rqckable -member and said lift arm, au actuatwg link pivotally: connectedi to said toggle adjacent the apey, thereof, a transverse rock shaft carried by said, tractor,_ said. rock shaft having formcd thereon a rock atm, po,",er operated means connected with. said tractor for rocking said rock shaft in one dire@tion, pivot mean@@ for connecting said rock arm to said actuwdng link wherein upon said rock shaft's being rocked. in said one direction, said toggle is caused to buckle stifficie:ntly to, swing said, lift arm upwardly frorn a working position to a transport position, said irtterconnecting:means for rocking said- rockable inember- being @ capable of - effecting fine. adjustment of said lift! arm: upon said Eft arm's being moved into its@ working position by means of said rock shaft. 5. In combination W; tracto th a,tractor, a r-rnounted cultivator comprising. a transverse tool bar secured to saidtractor and extending laterally. therefrom, a lift arm carried by said tool bar and roelable -about the axis thereof, an upwardly extending standard secured,@to said @ool bar adjacent said lift arm, a rockable member pivotally secured- to said standard and rockable about an @ axis substantially parallel to- the axis of said tool bar. and vertically disposed with respect thereto, a ro-, tatable screw interconnecting- said rockable member and said standard and capable of angularly adjusting said rockable member with respect to said standard upon being: rotated in one direction, a toggle @ linkage interconnected between said rockable member and said lift arin, an actuating link pivotally. connected to@ said toggle linkage adjacent the apex thereof, a@ transverse, rock shaft cariied by said tractor, said - rock shaft having formed thereon a rock arm, pivot means: for connecting said rock arm to said @ actuating- link, and power operated means carried by said tool bar and connected-ta said rock shaft for rocking said rock shaft in one directbii for- causing said toggle linkage- to buckle suffi&iently to swing said lift arm upwardly from a workingposition to a transport position, and means connected to said screw for causing rotation thereof for angularly adjusting@ said roclable membdr for effocting a fine adjustment of said lift arm. 6. In combination with a tractor, a tractor-mounted cultivator comprising@ a ttansverse@ tool @ bar secured to said tractor aiid extending laterally therefrom, a lift arm carried by said tool bar and ro--kdble about @ the axis thereof, an:upwardlv extending stdndard secured t-o said tool bar adjacent said lift arm,- a rockable member pivotally secured to said standard and rockabl@l about an axis substaiitially paralldi to the axis of -said tool b@ar and vertically disposed with r ect thereto a! rotatable esp screw interconnectin said rockable member aiid said @ 9 standard and capable of angularly adjusting, said rockable membet with respect to said standard' upon @ being@ rotated in one directi-on, a toggle linkage int onnected between said rockable member- and said lift @ir@ and so constituted as to be -in substantial longitudinal alignment kvhen @.said lift -arm is: in a Working position, an actuating link pivotally connected to -said -@toggle lilikage adjacent the apex thereofi a transverse rock a car-, ried: by said tractor, said rock shaft having@ fornied fnere-

9 on a rock arm, pivot means for connecting said rockarm to said actuating link, and power operated means carried by said tool bar and connected to said rock shaft for rocking said rock shaft in one direction for causing said toggle linkage to buckle sufficiently to swing said lift arm upwardly from a working position to a transport position, and means connected to said screw for causing rotation thereof for angularly adjusting said rockable member for effecting a fine adjustment of said lift arm. 7. In combination with a tractor, a tractor-mounted cultivator comprising a transverse tool bar secured to said tractor and extending laterally therefrom, a lift arm carried by said tool bar and rockable about the axis thereof, an upwardly extending standard secured to said tool bar adjacent said lift arm a rockable member pivotally secured to said standar '@ and rockable about an axis substantiahy parallel to the axis of said tool bar and vertically disposed with respect thereto, a rotatable screw interco.nnecting said rockable member to said standard and capable of angularly adjusting said rockable member with respect to said standard upon being rotated iii one direction, a downwardly depending link pivotally secured to said rockable member, a connecting link interconnected between said depending link adjacent the end thereof and said lift arm for causing upward swinging of said lift arm upon said links' being buckled, an actuating link pivotally secured to one of said links adjacent the pivotal connections of said links, a transverse roclshaft rotatably carried by said tractor, said rock shaft having formed thereon a rock arm, pivot means for connecting said rock arm to said actuating link, and power operated means carried by said tool bar and connected to said rock shaft for rocking said rock shaft in one direction for causing said links to buckle sufficiently to swidg said lift arm upwardly from a working position to a transport position, and means connected to said screw for causing rotation thereof for angularly adjusting said rockable member with respect tc> said standard for effecting fine adjustments of said lift arm. 8. The combination with a tractor, of a tractor-mountedcultivator comprising a main tool bar transversely supported by said tractor and extending to one side thereof, a lift arm carried by said tool bar and rockable about the axis thereof, and upwardly extending standard secured to said tool bar adjacent said lift arm, a second lift ari-n vertically spaced from the first mentioned lift arm and pivotally connected to said standard, a tool supporting bar vertically connecting said lift arms, a rockable member carried by said standard and swingable about an axis parallel to the axis of said tool bar and vertically disposed Nvith respect thereto, adjustable means interconnected between said standard and said rockable member at a point remote from its pivotal connection to said standard for securing said rockable member in various angular positions with respect to said standard, a toggle linkage interconnected between said rockable member and the first mentioned lift arm, an actuating link pivotally connected adjacent one end thereof to said toggle adjacent the apex thereof, a transverse rock shaft rotatably supported by said tractor, said rock shaft having formed at one end thereof a rock arm, power operated means carried by the tool bar and connected to said rock shaft for rocking said rock shaft in one direction, and a pivotal connection between said rock arm and said actuating link whereby said toggle linkage is caused to buckle in response to said rock shafts being rocked in said one direction ivherein said first mentioned lift arm is moved from a working position to a raised position, said adjusting means being capable of effecting a fine adjustment of said first mentioned lift arm upon said rockable member's being rocked into adjusted angular relationship with respect to said standard. 2,747,484 10 9. The combination with a tractor, of a tractor-mountedcultivator comprising a main tool bar transversely supported by said tractor and extending to one side thereof, a lift arm carried by said tool bar and rockable about the axis thereof, an upwardly extending standard secured to said tool bar adjacent said lift arm, a second lift arm vertically spaced from the first mentioned lift arm and pivotally connected to said standard, a tool supportinbar vertically connecting said lift arms, a rockable mem10 ber swingably carried by said standard, the axis of swinging movement of said rockable member and the axis of saingable movement of said second lift arm being substantially co-axial, adjustable means interconnccted between said standard and said rockable member at a point 15 remote from its pivotal connection to said standard for securing said rockable member in various angular positions with respect to said standard, a toggle linkage interconnected between said rockable member and the first mentioned lift arm, an actuating link pivotally connected 20 a.djacent one end thereof to said toggle adjacent the apex thereof, a transverse rock shaft rotatably supported by said tractor, said rock shaft having formed at one e@id thereof a rock arm, a power responsive cylinder carried by said tool bar and connected to said rock shaft for rock2.5 ing said rock shaft iii on-- direction, and a pivotal connection between said rock arm and said actuating link whereby said toggle linka,-e is caused to buckle in response to said rock shaft's being rocked in said one direction wherein said first mentioned lift arm is moved from 30 a working position to a raised positioii, said adjusting means being capable of effecting a fine adjustment of said first mentioned lift arm upon said rockable member's being rocked into adjusted angular relationship with respect to said standard. 35 10. A tractor-mounted cultivator rig for use with a tractor comprising a main tool bar secured to said tractor and extending latcrally therefrom, a pair of upwardly extendin.- standards secured to said main tool bar in spaced relationship, a pair of rearwardly disposed lift arms carried 40 between said standards aiid rockable in unison about the axis of said tool bar, a second pair of lifting arms vertically disposed with respect to the first mentioned pair and pivotally supported by each of said standards for rocking in unison about an axis parallel to the axis of said tool bar, 45 a rockable member pivotally carried by one of said standards at a point spaced upwardly from said tool bar, interconnecting means between said rockable member and said standard for holding said rockable member in various angular positions with respect to said standard, a toggle 50 linkage between said rockable member and one of the first mentioned lift arms for effecting swinging of said lift arm in response to angular adjustment of- said rockable member. an actuating link pivotally connected to said tog-,le adjacent the apex thereof and extending forwardly there55 from, a transverse rock shaft rotatably carried by said tractor, said rock shaft having a rock arm positioned in the plane of said actuating link and pivotally connected thereto, and power operated means carried by said tool bar and connected to said rock shaft for rocking said rock 60 shaft for bucklin- said toggle for swinging said lift arm into a raised positoion, said interconnecting means causing a fine adjustment of said lift arm when said lift arm is operatively positioned with respect to the horizontal upon said rockable member's being angularly adjusted. 6,5 References Cited in the file of this patent UNITED STATES PATENTS 815,744 Rice ------------------ Mar. 20, 1906 2,156,571 Lindgren et al - ---------- May 2, 1939 70 2,309,221 Smith ----------------- Jan. 26, 1943 2,337,762 Mott ------------------ Dec. 28, 1943 2,358,298 Benjamin -------------- Sept. 19, 1944 2,482,751 Hartsock -------------- SOpt. 27, 1949

2 ; 7 4 7 , 4 8 4 United States Patent Office , a i e n t o @ c t M a y 2 9 , 1 9 5 6 2,747,484 TRACTOR MOUNTED TOOL BAR 5 John B. Fraga, Stockton, CaRf., assiguor to J. 1. Case Company, Racine, Wis., a corporation of Wisconsiti Application December 5,1952, Serial No. 324,369 10 10 Claims. (Cl. 97-46.51) The present invention relates to a tractor mounted 15 cultivating implemert, and the primary object of the present invention is to generally improve the operation and construction of imp].-ments of this type. A further obj:ect of the present invention is to proiide a tractor-mounted cultivator implement having a culti20 vator ri- and a precision control mechanism in association with th-. cultivator ri.- for moving the gro@and working tools of the cultivator rig from a working position to an elevated or transport position, this precision control mechanism including power operated means for mov- 25 ing the ground working tools from a workin.- position to a trar.,sport position and manually operative means in association therewith for changing the working depth of the ground working tools without appreciably altering the height of lift of the ground working tools as effected 3 0 by the pov,,er operated means. The manner in which these objects are accomplished will be apparent from the jollonving specification and accompanying drawings in which said embodiments Of the invention are shown, but it is to be understood that 35 the ;nvention is not limited to the details disclosed but includes all such variations and niodffications as fo.Uow within the spirit of the invention as herein - expressed. In the drawings: Fig. I is a front view of a cultivator, iflustrative of 40 the present invention, shonvn in combination with a tractor, with parts removed. Fig. 2 is a view similar to Fig. 1, slightly eniarged, showing certain details in construction and with parts removed. 4 5 Fig. 3 is a plan view of the cultivator shown in Fig. 2 with parts removed. Fig. 4 is a left-froiat perspective view of the structure shown in Fig. 3, with parts removed. 5 0 Fi- 5 is a cross sectional view taken on the line 5-5 .f Fi@ 2, slightly enlarged. Fia 6 is a view similar to Fig. 5 and iflustrating the mechanism when the lifting arrangement is in its raised position. 5 5 Fig. 7 is a sectional view taken on the line 7-7 of Fi-. 3 slightly enlar- 'd and with parts removed. lieferring to Fi.-s'el, 2, 3, and 4 of the drawings, a tractor-mounted cultivator, illustrative of the present invention, is broadly desi.-nated by the number 10, and is (;a shown @:n combiiaation v,,ith a tractor II. The tractor IIL can be of any suitable or well-known construction and comprises in general@ a front portion 12 which is movably supported by a front wheel truck i3 and a rear portion, not visible in the drawings since th, 65 details thereof have no bearing on the present invention, but which is movably supported by rear traction wheels IL4. The cultivator 10 consists of two cultivator sections or rigs 15 and 16 which are carried on the opposite sides of 70 the tractor adjacent the forward end thereof and which are interconnected by means of a lifting arrangement 17 2 so that cultivating tools IS associated with each of the rigs are capable of being rocked from a working position to a transport position in unison. Since the details of constrlction of cultivator rig 15 are identical to the de-@ tails o'll construction ofcultivator rig 16, further discussion of the construction of these cultivator rigs wiU be limited to the const.-uction of cultivator rig 16, except insofar as con5truction of both of the cultivator rigs is deemed necessary in order to fully describe the operatioii and constniction of cultivator 10. Cultivator rig 16 is c(>mposed in the present instance of a transverse bar 19 which is substantially square in cross s@ction and which is received at its inner end in a transverse socket formed for convenience in the front wheel trtick 13, this socket being preferably of the type shown and described in the patent to Geraldson 1,914,117 and including in the p:-esent instance a keeper 20 ri.-idly secured to the main casting of the wheel truck 13 as by bolt or the like 21, the bar 19 being so supported as to extend laterally from the tractor in a plane substantially parallel to the horizontal. A main standard 22 is suitably clamped to the bar 19 adjacent the truck 13, and a secondary standard 23 is also clamped to the tool bar 19 and laterally spaced from the standard 22. The standard 22 in the present instance is of fabricated construction and is composed of plates 24 and 25 which are fixed in spaced relaLionshipbymeans of suitable spacers 26 and 27, spacers 26 and 27 being rigidl@y fixed to tiie respect@'.Ve plates 24 and 25 as by welding or the like. The lower ends of plates 24 and 25 axe suitably aperttired for receiving therein the bar 19, and a pair of wrenching plates 28, also suitably apertured, are received by the bar 19 between the plates 24 and 25. A wre:ich block 29 is rigidly fixed between the plates 28 and carries adjacent its lower end a forwardly extending screw 30, see also Fig. 5. Screw 30 is rece:lved fonvardly in a suitable aperture foii-iied in spacer 27, and a nut 31 is threadedly received on the screw 30 for catising a wrenching effect of plates 28 and plates 22 and 24 relative to one another and of a degree sufficient to s,-cure standard 22 rigidly to bar 19 in an upwardly extending condition. Standard 23 is also of fabricated construction and includes in the present instance plates 3-P and 33 held in spaced relationship by means of a suitable tra,2sverse inwardly extending pin 34 and spacer 35, pin 34 and sloacer 35 being fixed as by weldin.a or the like to the respective plates 32 and 33. The plates 32 and 33 are suitably apertured so as to receive the bar 19 and a wrench block 36, which also has an aperture formed therein, is received by the bar 19 between the plates 32 and 33. A cap screw 37 is threaded into a suitable aperture formed in the spacer 35 and is so positioned as to - r@,iove idto abutting relationship with respect to wrenching block 36 so that the same is capable of use for effecting wrenching of block 36 with respect to plates 32 and 33 for rigidly fixing standard 23 to bar 19 in an upwardly extending position. A lower rockable member 38 is rotatably car-.-ied c,,i-L shouldered blishin.-s 38a o@i the bar 19 between tiie standards 22 and 23, and an t@oper rockable riember 39 is vertically spaced from the rockable member 38 and rotatably carried between the standards 22 aiid 23, bein.journal-,d on pin 34 and a pin to be desciibed presently. Rockable member 38 coriiprises in the present instance a tubular member 40, the standards 22 and 23 being so spaced on the bar 19 as to prevent substantially all axial play of the tublilar member 40 therebetween. Rearwardly extending ali.-ned lift arms 41 and 42 are fixed as by welding or the like to the tubular member 40 adjacent the opposite ends thereof. The rockable member 39 consists of a tubular m,-mber 43 which rotatably receive&. adjacent its respective ends that portion of pirl 34 ext@iid-:'

3 ing inwardly from@ plate 32 and that portion of a pin 44 extending laterally from plate 25, pin 34, and pin 44 extending toward one anoth--r and being substantially co-axial and parallel to bar 19. The tubul@ar member 43 has- Rxed- to the opposite ends thereof as by welding or th@@ like rearwardly e@x-tending ali&-ned lift arms 45 and 46,, and the lift arms 45 and 46 are each longitudinally ad.jtlstable@ and eachincludes a-.1 extension bar 47 rigidly seciared-to- the revective a.-ms 45 and 46 as by bolts or the like 48. The arms 41; and 45, and 42 and 46, are joined@ in a- vertical direction by means ol' tool su.rporLiii-- bars@ 49 ' fne: tool slipportiii.- bars 49 @being suitably apertured and secured: to- the opposite sid,es of the lift arms 41, 45, 42. and 46 by means of sui@Lable bolts or the like 50. It will. be appreciated that the uppl@r arms 45 and -46 are preferably carried: in siibstantially pa-allel relltionsw]@ with respect ta the lower arms 42 so as to effect a parallelogram with respect- to the standards 22 and- 23@ and the tool supporting bars-49. The tool supporting bars 49 have forried adjacent their laiver7 ends horizontaffy aligned notches 51, Fig. 4, and a cultivator tool bar 52 is received in these iiotches 51. A- suitable clamp 53 Gf- an3r we'il-kn(-wii or suitable con-struction is provided fGr rgidly s,-curing the tool bar 52 to each set or pair @of tool supportui.- bars 49. The cultivator@ tool bar 52 supports a plurality of- depending tool s.@anks 54-and the tool shanks 54 are rigidly secured to the cultivator tool bar 52 by means of clamps 55a ol' any s-aitable or wellknown construction, the tools 18 bein,- suitably fixed to the shanks 54 in any suitable mar,ner. The lifting arrangement 17 has as a part thereof a lifting linkag@- associated with the culti-.,ator rig 16 designated 1,@road-ly as ndmber 55, Fig. 5. The lifting linlage 55 consists of a swiii,@able member or bell crank 56 v,,hicli is fabr;cated from spaced apart plates 57 and 58, bell crank -46 beirig, pivotall'y carried between tie plates 24- and@ 25 of stardard 22 by means of above mentioned pin 44.. Adia-.ent@the tipver end of standard 22 is carr;ed a r,.ut 59 which has a threaded apertlre fcfi-med therein and w'iiic'ti also has trapsverse tiunr@:loits 60 extending from the- otypos;te sidesthereoi'@ The trunnions 6@9 are received in suitable aperttires formed iii t'@ie plates 24 and 25 of stardard 22 so as to permit rotative n'lovement of tlie-nut 59 about-an axis su3stantially parallel t6 tile bar l@9- and suitable lock nuts 61 are threaded on the erids of tr@inniotis 60 for ptvsit-lonin-. the nut 59 belween the plates 24 and 25. A iiut 62, similar in construction to nut 59, is carried adjacent -the tipper ciid of bell crank 56, the nut 62 hw,,ing transverse trutinions 63 extending f.-O@-ii the opposite sides tliereof and the plates 57 and 58 ha,,,ing fixed therein suitable apertur-@d inserts 64 for rotatably supporting the trlinnions 63, nut 62 being rockable about an axis stibstantially parallel to the a,,is of trunuions 60 of nut 59. The aperture of nut 59 is threaded so as to receive in the present instance a right-handed screwtherein and the aperture of nut 62 is threaded so as to receive a- left-handed screwtherein, and- an adjusting screw 65 having a threaded portion 66, threaded so as to be received in the aperture formed in,the niit 59, and a thteaded portion 67, threaded so as to be-received in the aperture form@-d in the nut 62 @ andconveniently of -a greater diameter than the portion 66, is provided for interconnecting the bell crank 56 to the standard- 22. It @ will be appreciated that bell crank 56 is sllvingable about the axis of pin 44 when the adjusting -screw 65 is ttirned' so as to move the lock nut 62 toward the lock nut 59 or away from the lock nut 59. Since portion 66@ of screw. 65 has a right-hand thread and the portion 67 has a leff,hand thread, nuts 59: and 62 will move axially of screw 65 in opposite directi6ns when the screw is turned. Fur,thermore the, nuts 59 and 62 wiH approach or recede from each other. at twice the, rate which xvould result from prior known arrangqments, whereas the angle. of the th@@3ad need not be steep enoii to mak the device 2,747,484 4 reversible. In other words th-. angle does not need to be so steep that thrust on the nuts might cause@ undesired rotation of the screw and consequent loss of adjustment. The bell crank 56 is connected between pin 44 and nut 62 to one end of an arcuate shaped link 68 by means of a suitable pivot pin 69, and a pair of connecting links 70 are pivotally secured to the opposite s;des bf the arcuate shaped link 68 adjacent ttie lower end thereof @ by means of a suitable pivot pin 71. T@ke other ends of the con10 necting links 70 are connect-.d to an inwardly d isplaced'i)rackel 72 (Fi.-. 3) by means of a suitable pivot pin 7-3; bracket '12 being fixed' to arm 41 as by welding or the like. The arcuate,- shaped link 68 extends forwardly -fror@i its pivotal connection with the connecting links 70 15 and is pivotally connected adjacent its forward end by means of a suitable pivot pin 74 to a pair of forwardly extending actuating links 75, actuating links 75 being positioned above the bar 19 and passing freely between the plates 24-and 25 bf standard 2Z. go The lifting arran.-ement 11 further includes as a part thereof a rock shaft 76, the rock shaft 76 in the preseilt instance being composed of a tubular member 77 which rotatably receives in the- opposite ends thereof suitable inwardly extending co-axial trunnions 78- (Fig. 2@ fixed 25 as by welding or the like in forwardly extending brackets 791, only one of the trunnioris 78'being visible in, the dranvings. Brackets 79@ are in turn fixed as by welding or th-. like to the s-oac-,F 26 of standard 22 and to a spacer 80 of a standard 91, standard 81 bein-, associated with 30 cultivator rig 15 and being identical in construction to the standard 22 of cultivator rig 16. The opposite ends of the rock,shaft 76 have fixed@thereto depending aligried -rock arms 82 @tnd 83, and the distal end 6f the rock arri 82 is pivotally connected by means of a suitable pivot pih 35 84 to the actuatidg links 75 adjacent the forward end.@ tliereaf. The@ distat end of the rock arm 83- is pivotauy connected by meaiis of a, swtable pivot pip 85 to actaat@ing links 86 adjaceit thi-, forward ends thereof, the cultivator rig 15- liaving a liftin,@ litikage, broadly desi,@nated 40 as 87-1 which is identical . in construction to the lifting linkage. 55 of cultivator rig 16 ' The rock shaft 76@ also has fixed thereto a downwardly depending crank 38 which is connected'to a clevis 89 bf a hydraulic motor 90@ by means of a suitable attachiiig. 45 Pin 91, see also Fig. 7. The hydraulic motor 91 is capable of being of any suitable or well-known type and incltides in the pre5ent ffistance a cylindrical portion 92 and a p@@ton rod 93, rod 93'being fl-ed adjacdht one end thereof to clevis 89 and adjacent the ot'her end thereof to a suitable 50 piston 94@ which is slidably Tecoilled i@.1 the rvlindr-ical portion 92. The tractorILI includes as a part thereof a suitable hydraulic system, not visible in th-e drawings, which is connected to the hydraulic motor 9Z' by means of -si;iitable conduits-95 and'96, this hy&aulic system being of the 55 type which is under complete coqtrol of th@@-operat(>r so that selective axial movement bf the. piston rod 93 can lYe effected as well-kn6wn,in the art. A suitable anchorage 97 is carried by the bar 19-adiiicent standa-rd 22- for supportinz the other end of -the cylin6o dricalportion92. More-specificallya ton-.ue98@isformed adjacent @therearward! end of the cylindrical portion 92 and a suitable attaching pin 99 supports the tongue 98@@ between upwardly extending anchorage brackets 100. Anchorage brackets - 100. 1 are fixed as by. weldin-, or the 65 like@io,rearv.,ardly@ extending spaced@apart rigid plates @101, plates 101:beiag-received by the bar 19 and being rigidly held in spaced.Apart@ relationship by means of @spacers@ 1,0.2 and 1-03@ A-pair of wrenrhing plates 1.04 is also received by the, bar 19: between the plates 101, and a wrenchiag 70 block 105. is fixed @b-.tween the -plates as by welding or ih,-, like. The spacer 102 has a threaded opening formed the.rein and a- screw 106 is threadedly received i@i this opening@ and abuts -Nvicnching, block 1-05 upon -the sam(being threaded suffi@iently in the opn'mg for effdcting a 75 wrenphing action between the p@ates 104 and 101 for

5 rigidly fixing anchorage 97 in its proper position to bar 19. 'fhe above mentioned adjusting screw 65 has fixed to the rearward end thereof a suitable universal coupling 107, and a rod 108 is fixed adjacent its forward end to one member of coupling 107 so as to cause rotative movement of screw 65 when the rod 108 is tumed. The rod 108 extends rearwardly and is rotatably supported adjacent the operator's station on the tractor by means of a suitable supporting structure 109 suitably carried by the tractor and a suitable handle 110 is provided adjacent the remvard end of the rod 108 within convenient reach of the operator so that the operator from his station on the tractor may rock the bell crank 56 about the axis of pin 44. Referring specifically to Fig. 5, the lifting linkage 55 is shown in its operative position, the hydraulic motor 90 beiiag iia its retracted position and the lift arms 41, 42, 45, and 46 bein.- positioned substantiary parallel to the horizontal ' The bell crank 56 as previously su.-gested, is capable of being held in various angular positions with respect to standard 22 from its maxiinum forward position, which is shown in dotted lines and designated by the number III to its maximum rearward position, which is also sholvn in dotted lines and represented by the number 112, the fuR line position of the bell crank 56 being substantially medially betv,,een its maxiinum forward position and its maximum rearward position. When the bell crank 56 is locled in its substantiauy medial position, represented by the full lines, the arcuate shaped links 68 and the connecting links 70 in cooperation with the actuating links 75 are so proportioned as to support the lift arm 41 in a position substantially parallel to the horizontal. It will be appreciated that link 68 and connecting links 70 are in the form of a toggle linkage, and the centers of their attaching pins 69, 71, and 73 lie in substantially the same plane when the bell crank 56 is locked in its subs' antial medial position. This meads that stresses origiiaating along the nrms 41 and 42 are transmifted directly to standard 22 through the connecting links 70, the arcuate shaped Enk 68, the befl crank 56, and the screw 65. The resultant effect of this construction is that the arms 41 and 42 are stable and springin.- due to stresses in the various parts is not translated into lost motion allowing fluctuating of the tool setting. When the rod 108 is tumed in one direction sufficiently to move the bell crank 56 from its position shown in full lines to its maximum forward position shown in dotted lines at 111, the link 68 is moved upwardly and forwardly about the axis of pin 44, and this displacement of link 68 is sufficient to swing the lift arm 41 from its full line position to its position shown in dotted lines and designated by the number 113. Upon sufficient turning of the rod 108 in the opposite direction, the bell crank 56 can be rocked rearwardly to its niaxinium angled position with respect to standard 22, this position being shown in dotted lines and represented by number 112.- 'Ihe link 68 wi,ll then be moved downwardly and as seen m dotted lines a distanee sufficient to position the Eft arm 41 in a slightly downwardly inclined position Nvhich is shoivn in dotted lines and represented by the number 114. It will be noted that in moving the lift arm 41 from its full line position to its position shown in dotted lines and represented by the number 113 or to its position shown in dotted lines and represented by the number 114 that the center of pivot 71 has been moved slightly to one side or the other of a plane through the center of pivot pin 69 and the center of pivot pin 73. However, this misalignment of the center of pivot pin 71 is so slight that substantially all stresses originating along the arms 41 and 42 are still transmitted directly to standard 22 through the connecting links 70, link 68, bell crank 56, and screw 65. It wM be appreciated that the adjustment of bell crank 56, such for instance as moving the same from its full line position to its positions shown at Ill and at 112 so as to effect swinging of the lift arm 41 from its full line position to its position shown at 113 or 114 is wholly independent of the hydraulic motor 42 and the 2,747,484 rock shaft 76 and is most effective for accurately reguiating the depth at which the shovels IS perform their cultivating function. For swinging the arms 41 and 42 tipwardly from their working position to their transport position, the bell crank 56 being in its medial angular position with respect to standard 22 as viewed in solid lines in Fig. 5, the h@draulic ihotor 90 is acttiated so that the piston rod 93 thereof is extended forwardly, this in tum rock10 ing the rock shaft 76 in a direction so as to cause the rock arm '02 thereof to swing forwardly, see Fig. 6. Upon the distal end of the rock arui 82 swinging forward in the path indicated, the toggle linkage, which comprises arcuate shaped links 68 and connecting links 15 70 is caused to buckle forwardly by reason of the actuating links 75. When the piston rod 93 of the hydraulic motor 90 is extended a predetermined distance, the toggle linkage will be caused to buckle sufficiently to swing the lift arm 41 to its raised position, and this position 20 is so calculated as to raise the cultivating tools 18 a predetermined distance from the ground. The lifting link is so constituted that the lift arm 41 is swung into substantiafly th@- same rearwardly and upwardly inclined position upon extension of the piston rod 93 a prede25 termined amount regardless of whether the lift arm 41 is positioned in its fiall line position as viewed in Fig. 5 or in its dotted 1,:ne positions as represented by the dotted lines 113 and 114. It will be noted in Fig. 6 that upon the toggle links 68 and 70 being buckled suffi30 ciently to swing the lift arm 41 into its raised position, that the pin 71 is caused to move substantially in an arc drawn from the center of nin 73 through the center of pin 71 when the bell crank 56 is angularly adjusted with respect to standard 22 from its maxinium forward 35 position to its maximum rearward position. Tlis are of travel is represented by the niiniber 115 and il@ie number 116 represents the pivot pin 71 when the bell crank 56 is in its maximum forward position as represen . ted by Ill. The dotted circle numbered 117 rep40 resents the pivot pin 71 when the bell crank 56 is iii its maximum angular position with respect to standard 22 as represented by number 112. It will be appreciated that the center of pin 71, whether the bell crank 56 is in its full line position, its position represented 45 by number 111, oi its position represented by number 112, lie in the arc 115 and that up and down deflection of the centers of pin 711 on the arc 115 has substantially no effect upon the center of pin 73 so that regardless of the ang-alar position of the bell crank 56 with 5o respect to standard 22, the lift ami 41 is swun.- at all times into its maximum rearward inclined position upon a predetermined extension of piston rod 93. In other words, as apparent in Fi.a. 6, in the lifted position of the parts, pin 71 -is substar@tially in dead55 c,-nter relation to pin 73, while at the same time it is substantially in d,-ad-center relation to pins 74 ard 84, so that adjustment of screw 65 w:@ll have substantially no effect on the position ol pin 73 when the rigs are raised. 60 As previously suggested the cultivator rig 15 has a lifting linkage 87 which is identical in construction to the lifting linkage 55 of cultivator rig 16. Therefore, when the rock shaft 76 is rocked iTi a lifti-@ig direction by the hydraulic motor 90, the cultivatin- tools 18 of 65 cultivator rig 15 will be moved into their'transport position in unison with the cultivating tools 18 associated with cultivator rig 16. It will be appreciated however that the mechanism for effecting fine adjustmer@t of thecultivating tools 18 associated with rig 16 are operable 70 .ndependently of the mechanisms associated with cultivator rig 15 for effecting fine adjustment of the cultivatin- tools associated with the latter. Bar 19 and a similar bar 117a associated with cultivfttor rig 15 and identical in construction to bar 19, are 75 braced by means of suitable braces 118 suitably clamped

2,747,484 7 to, the.@ resp, ective bars adjacent t-he@ tractor, . thebraci@s - 118. converging upwardly and. being. secured by bolts - 119 to the wheel truck 13 of the tractor, Additional braces 120 are secured by bolts 119 and laterally fixed by means of suitable eye bolts .121 to. suitable braclets 5 12Z fi--ed to the ends of the, bars 19 and 1,1,7a. Still aiaother brace 123: extends between the brackets. 122 and up,wardly and over arms 79 of standard 22 and 87@ This braice is formed in two,parts and interconnected by means, of a suitable turn buckle, 124. la What I