US1489020A - Disk harrow - Google Patents

Description

H. S. SMITH April 1, 1924.

DISK HARROW Filed Oct. 13, 1919 11 Sheets-Sheet 1 April '1,1924 1,489,020

H. S. SMlTH DISK HARROW Filed Oct. 13, 1919 ll Sheets-Sheet 3 April 1, 1924. 1,489,020

H. 5. SMITH DISK HARROW Filed Oct. 13, 1919 ll Sheets-Sheet 3 H. 5. SMITH DISK HARROW April 1 1924.

Filed Oct. 13, 1919 11 Sheets-Sheet 4 6 flZi/S, 5% L i A. W61, 2%, QMMYJW @f/QE' April 1 1924. 1,489,024)

H. 5. SMITH DISK HARROW Filed Oct. 13, 1919 11 Sheets-Sheet 5 H. s. SMiTH DISK HARROW April 1 1924.

Filed Oct. 13 1919 ll Sheets-Sheet 6 H. 8. SMITH DISK HARROW Filed Oct. 15, 1919 ll Sheets-Sheet gin/v4, iii/BMW- April 1 1924. 1,489,020

H. 8. SMITH DISK HARROW Filed Oct. 13, 1919 ll Sheets-Sheet 8 Herr-y 615M 11 W, M, gum vim H. 8. SMITH DISK HARROW April 1 1924.

, 1919 ll Sheets-Sheet 9 Filed Oct. 13

April 1 1924. 7' 1,489,020

I H. 5. SMITH v DISK HARROW Filed Oct. 13 1919 11 Sheets-Sheet 10 mum nilm mwzm Patented Apr. l; i924.

can s1 v ransorarer raise- HENRY S. SMITH, F DIXON, ILLINOIS, ASSIGNOR TO J. EASE THMSHING MACHINE GOMPANY, 0F 'RACINZIE, WISGONSIH, A COBPOTID'N OF WISGQNSW.

DISK nanaow.

Apnlication filed ()ctober is, new. Serial no. smear.

'1 '0 all whom it may concern:

Be it known that ll, HENRY S. SMITH, a citizen of the United States, residing at Dixon, in the county of Lee and State of Illinois, have invented certain new and use.- ful Improvements in Disk Harrows, of which the following is the specification.

A 'My invention has reference more particularly to adisk harrow of the type commonly known as a tandem disk harrow, although it embodies certain features of invention which may be applied. to structures other than the tandem type.

It is customary to build disk harrows with two front disk sections and two rear disk sections which are arran ed so that the sec- 7 tions may be adjusted re atively and atvarious angles to the line of draft for the purpose of thoroughly pulverizing the ground.

The principalobjects of my invention are vto provide new and improved means for connecting the sections so as to permit the desired adjustment; to provide new and improved means for effecting such adjustment; to provide a separate draft connection of each rear section with the front sections or frame thereof; to construct such connections I so as to permit differential swinging or advance of either. rear section with respect to the front sections to facilitate turningmovement of the machine; to effect the desired relative adjustment of the various sections and obtain different angular relations of the sections with the line of draft through the operation of a sin 1e adjusting lever; to utilize the pull on t e implement to facilitate and maintain the adjustment of the sections; to provide a disk harrow which is particularly adapted for use with a tractor 405 and capable of adjustment by the operator on the tractor; and in general to provide animproved disk barrow structure of greater flexibility and more convenient to operate than devices of the character heretofore provided.

On the drawingsv Fig. 1 is a top or plan view of the com- .plete harrow with the disk section adjusted in position at right angles to the line of draft;

Fig. 2 is a similar view with the sections adjusted at an inclination to the line 0f draft; c I

Fig. 3 is a view similar to Fig. 2, showing the machine as it makes a turn;

line 6-6 of Fig. 2;

Fig. 4 is an enlarged side view of the front portion of the harrow adjusted as shown in Fig. 1; V I

Fig.5 is a similarviewof the rear portion of the harrow with parts'hroken away to disclose details of construction;

Fig. 6 is an enlarged side view of the for-' ward portion of the harrow taken on the Fig. 7 is a to or plan view of the struc- 05 ture shown in ig. 6;

Fig. 8 is atop view of a structure shown in Fig. 5;

Fig. 9 is an enlarged side, view of the mounting of the adjusting lever and draft connection with which it co-operates.

Fig. 1 0 is an enlarged view on the line 1010 of Fi .8 showing thepositions of the parts when t e rear disks are adjusted to the extreme advanced ositionof inclination;

Fig. 11 is an e arged detail view on the line 11-11 of Fig. 1 with the bearing for the harrow section shown in section;

Fig. 12 is a sectional view on the line 1242 of Fig-11;

Fig. 13 is an enlarged sectional view of the adjusting mechanism for the front sections taken on the line 13-13 of Fig. 6;

Fig. '14 is an enlarged sectional view on the line 1414 of Fig. 1 of the guide mechaportion of the .nismfor the adjusting levers which connect with the rear sections;

Fig. 15 is a top view of a modified form of mechanism for loosely connecting the forward end of the directing arm of the rear section with'the front section; and

Fig. 16 is a modified form of regulating connection for the rear disk sections.

As shown on the drawings this harrow comprises a pair-of front sections 1 and 2 '95 and a. pair of rear sections 3 and 4 each'of which consists of a plurality of similar. disks 5 which are mounted in the usual manner on the shaft 6. These disks are dished as showniand those on the forward sections i 1 and 2 are arranged with the concave sides I thereof facing outwardl and those on the rear sections 3 and 4 acin inwardly as shown so that the front an rear sections act in an opposed manner on the soil and effect a thorough pulverization thereof.

An angle iron 7 is located above each section 1 and 2 and parallel with the respective shaft 6 thereof, and each angle iron has a pair of spaced depending hangers indicated hanger is provided between each angle iron 7 and the axle of its corresponding disk sectionl or 2 at a point somewhat beyond the longitudinal center of'the section,

and at this point each of the forward sections is pivotally connected with the mam draft frame of the harrow so that as the harrow is drawn along the ground the inner ends of the sections tend to swing rearwardly and are held against such movement by the adjusting rods 9.

The main draft frame of the harrow com prises a pair of rearwardly divergmgdraft bars 11 which are connected together in spaced relation adjacent the rearends by'a transverse brace 12. The rear ends of the bars 11 beyond the brace 12 are arranged parallel with one another and bent downwardly, as shown at 13, and vertically p1voted .at 14 at the rear of the axle of the disks to a boxing 15 at the lower end of the hanger 10 which boxing engages around the axle of the disks. The hanger 10 is somewhat similar to the hangers at the inner ends of the angle; iron 7 and comprises a fiat bar which is bent at the upper end as at 16 to lie against the under side of the horizontal flange of the angle iron 7 and is secured thereto by the bolts 1 7 and 18 There is also a brace bar 19 which hasone end secured to the angle iron 7' by the bolt 18, and the" other end secured to the downwardly extending portion of the bar to which the numeral 10 is applied, by the bolt 20 so as to reinforce the anger. The bar or brace 19 is formed with a. horizontal portion 21 lying below the lower edge of the vertical flange of the angle iron? and there is an extension 22 bolted to each of the bars 11 at the point where the brace 12 is connected therewith, which extension has the rear end elevated andturned horizontally, as shown at 23, and this horizontal portion 23 extends rearwa-rdly over and rests on the horizontal portion 210i the brace 19 and projects at the rear of the angle iron 7. In as much asthe pivotal connection 14 of the frame 11 -12 with the axle of the disk section is at the rear thereof the portion 23 of the extension 22 will slide lengthwise of the section over the horizontal portion 21 of the brace 19 as the disk section swings about its connection with the frame 11-12, and to '44 of the axle sufficient freedom to permit the necessary sliding movement therein. The forward ends of he divergent bars 11 are bolted together with a pair of spaced parallel rearwardly extending bars 26 therebetween and a draft'block 27 interposed between the forward ends of the bars 26 and likewise the forward ends of the bars 11, all being clamped together by the bolt 28.

The rear ends of the bars 26, which ter minate ahead of the front sections 1 and 2 are secured together by bolts 29 with sep' arator blocks 30 interposed therebetween. These bars 26 afi'ord what I will hereinafter -refer toas a stub tongue, and have an angle plate 31 secured to the bottom thereof at the 22 has a bolt 25 engaging the slot 24 with g rear end and provided with a downwardly 7 extending portion 32. There is also an angle plate. 33 secured to the top of the stub tongue at the rear end and rovided with an upright portion 34 in a ignment with the downwardly extending portion 32 of the angle plate 31 and at the upper end of the portion 34 isa rearwardly extending tongue 35. The aligning portions 32 and 34 of the angle plates 31 and 33 are both vertically slotted at 36 and 37 respectively, and there is a'plate 38 secured against the rear faces of the portions 32 and 34 by bolts 39 and 40 engaging respectively in the slots 36 and 37'. This plate '38 has an axle plate 41 pivoted at the lower end on the bolt 39 with a reinforcing strap 42 having one end engaged on the'bolt 39 at the outer side of the plate 41 and the other end secured to the plate 38 above the axle plate 41 by a bolt 43, and each end of the plate 41 is rounded to afford an axle 44 on which a roller 45 is mounted to rotate. A yoke 46 is suspended from the axle plate 41 and extends under the adjustin rods 9 to confine the latter between the orizontal portion of the oke and the rollers 45 and the arms 47 of t e yoke are perforated at their upper ends and engaged on the respective axles plate 41 at the outside of the rollers 45 and held. thereon by cotterpins 48. The rods 9 are prevented from shiftin outwardly from under the rollers 45 by t 0 arms 47 of the yoke, and to pnevent 4 said rods from shifting inwardly Ifrom under the rollers I have secured a strap 49.

to the-horizontal portion of the yoke 46 intermediate of the ends thereof by means of the bolts 50 and provided this strap with upturned ends 51 adjacent the inner edges of the rollers 45. The connection of the plate 33 with the portions 32 and 34 of the angle plates 31 and 33 respectively by the bolts 39 and 40 engaging the slots 36 and 37 permits vertical adjustment of said plate 38 and the mechanism at the lower end thereof which supports the rods 9, said bolts being loosened to effect suchadjust-V ment and thereafter tightened to hold the plate 38 in place. To facilitate adjustment of the plate 38 'I have turned the upper end of said plate rearwardly as at 52, and provided said end with an adjusting screw 53, the end of which bears against the horizontal portion35 of the angle plate 33. It will be observed upon a complete understanding of the machine that-the normal tendency of the adjusting rods 9 is to bear upwardly and they therefore normally bear against the rollers 45 so that the latter reduce the friction of "the rods 9 and permit easier adjustment of the harrow sections, and it is because of the tendency of these adjusting rods to bear upwardly that the adjusting screw 53 is arranged to force the plate 38 downwardly therea-gainst.

The rear frame of the harrow is arranged to permit the rear harrow sections 3 and 4 to trail behind the front sections 1 and 2 and maintain the rear sections one slightly in advance of the other so as to prevent clogging at the center, which might occur if the inner ends of the rear sections were arranged directly opposite one another. This rear frame comprises an arched bar 54 with the downturned ends vertically pivoted at 5115 in bearings 56 of the respective sections 3 a d 4., which bearings loosely engage the axle of the disks. These bearings 56 are arranged slightly out beyond the center of the disk sections'3 and 4, as shown, so that as the harrow is drawn along the ground the inner ends of the sections tend to swing rearwardly, such tendency being resisted by adjusting rods 57 and 58 respectively of the sections 3 and 4, each of which is pivotally connected to a boxing 59 on the axle of the respective disk section and adjacent the inner end thereof. Each downturned end of the arched bar 54 hasa pivot lug 60 connected to the front thereof just above the bearings 56 and-each pivot lug 60 is connected by means of an extensibledraw bar to the rear end of the horizontal portion 23 of the extension 22 of the front frame 11-12 at the corresponding side of the harrow. This affords a separate and independent draft connection for each rear section with the forward frame of the harrow, and in order to maintain the section 3 slightly in advance of the section 4 the extensible connection 61 for the section 3 is somewhat shorter than the extensible connection 62 of the section 4. maintains the arched bar 54 in a position slightly diagonal to the line of draft as shown in Fig. 1, which position is provided This difference in length for in the connection of the directional control member therewith, as will be hereinafter more fully explained. I

The draft connections 61 and 62 are alike except as to length and comprise rear and front sections which are slidably connected with one another. The rear section comprises a pair of horizontally spaced bars 63 which have the forward ends secured together by a bolt 64 with a spacer block 65 interposed therebetween to maintain the desired separation of the bars. A hook 66 has the shank thereof interposed and bolted betweenthe'rear ends of the bars 63 to maintain the required separation thereof and the hook is inserted through a horizontal aperture in the lug 60 to provide a connection of the draft connector 61 or 62 therewith so that the latter may be swung horizontally or vertically. The forward section of each connector 61 and 62 comprises a pair of bars 67 which are vertically spaced to engage the bars 63 therebetween and have a spacer block 68 interposed between the rear ends thereof intermediate of the bars 63 and above and one below the rear vertically per:

forated end of the horizontal portion of the corresponding extension 22 of the front frame and pivotally secured thereto by a bolt 70 so that the connectors 61 and 62 wing laterally on the pivot bolt 70.

F or maintaining the rear harrow frame and harrow sections in upright position, and supporting the adjusting mechanism of a the rear harrows and also for guiding the rear sections, the arched bar 54 has a frame extending forwardly therefrom intermediate of its ends and loosely connected to the rear end of the stub'tongue 26. This frame comprises a pair of bars the'rear portions of which are somewhat widely spa'ed and have the rear ends bent outwardly and bolted to the front face of the arched bar 54 at spaced points about -midway of their length. the bars 71 are brought closer together and extended forwardly in somewhat closely spa ed parallel relation and secured together by bolts 72 and 73 with spacer sleeves 74 on said bolts interposed between the bars. At the forward ends of the widely separated portions of the bars 71 a brace plate 75 with upturned ends is interposed therebetween and a brace rod 76 is secured to the forward end of eachof said widely separated perarm of a knuckle which straddles the rearend of the extension 35 and is likewise ply.- oted thereon by the bolt 79. The endsof the bars 71 are prevented from rising up out of the yoke 78 by a bolt 81 which connects the upper ends of the arms of the yoke above the bars 71. The bars 71 are sufiiciently long so as to remain engaged in the yoke 78 at all times and are loosely engaged therein so as to exert no draft strain on the rear sections (the draft connection being afforded by the extensible connections 61 and 62) and merely serves to hold the rearframe and sections in upright position and permit approximation of'the front and rear harrow sections, when the barrow makes a turn, as shown in Fig. 3.

The relative adjustment of the front and rear'sections'of the barrow is effected b a single lever 82 which is mounted at the orward end of-the front frame in a position convenientlyaccessible to the operator of the tractor which is pulling the harrow.

This lever extends down between the bars 26 of the stub tongue and is'pivoted at its lower end at 83- on a pair of depending straps 84 which are secured to and extend downwardly from the stub tongue. These straps may have [a hanger 125 depending from the pivot 83 and normally hanging downwardly by reason of its pivotal connection to afford a convenient support for the front end of the tractor frame when the forward end is unsupported by connection with the pulling tractor. A notched segment 85 islikewise pivoted Jon the bolt 83 and extends up above the stub tongue and has notches 86 adapted to be engaged by a locking pin or dog 87 on the lever- 82, which pin or dog is operated by a grip lever 88 at the .handle'end of the lever 82 inthe usual manner. so that the operator may release the engagement ofthe lever with the segment and adjust same therealong as required. The segment 85 at a point above the stub tongue is pivoted to the rear end of a link 89 and said link is pivotally co nnectedat its forward end between oscillating draft plates 90. which latter are pivoted at 91 at each side of the draft block 27. This draft block has an arcuate slot 92 at the rear of and formed around the pin 91 as its center and a draft clevis 93 is secured to the draft plates 90 by a bolt 94 passing through the'slot 92 in the draft block 27. This slot es es 92 is disposed half above and half below a horizontal line passing through the pivot 91 so that when a pull is exerted on the thereby holding the segment 85 in-either one or two extreme positions determined by the length of the slot 92. Obviously the plates 90 may be swung to either extremity by shifting the lever 82. and when swung past the center of the slot 92 the pull on ,ithe clevis 93 throwsthe bolt 94 to the other extremity of the slot 92 and the plates 90 and the segment 85 to the corresponding extremity of oscillation in which position the parts are held by the pull on the clevis 93.

Mounted on the stub tongue 26 at the rear of the adjusting lever 82 is a lever 95 which is pivoted intermediate of its ends on a bracket 96 which is secured to the bars 26 of the stub tongue. This lever 95 is oscil lated by a link 97 which is pivotally con-v front disk sections 1 and 2 pivotally connected thereto, the forward ends of said arms 9 being bent inwardly to come against the opposite sides of the lever 95 to which they are secured by the pivot'bolt 98.

q For adjusting the rear disk sections 3 and 4 and holding the innercends thereof against verticalmovement, the rear frame of the harrow has a forwardly and rearwardly extending guide bar. '99 on which a collar or slide 100 is slidably mounted for forward and rearward movement and the arms 57 and 58 for the rear disk sections are connected to the slide. The guide 99 consists of' a bar placed edgewise as shown, and having the-rear end bent up and secured to the arched bar 54 of the rear frame, while the front end of said-bar issecured in a socket. formed centrally in the brace plate 75. IIhe slide 1-00has a cross-plate 101 securely bolted thereto at the forward end tend transversely of the machine and oscil-' A guide plate late on a horizontal axis. 106 is secured to each end of the cross-bar and each has a rectangular aperture 107 through which the respective adjusting arms- 7 or 58 of the rear disk section is passed.

Obviously, by reason of the spaced position of the cross-plate 101 and cross-bar 105 and and extending under the bar 99. and prothe connection of the adjusting arms 57 and 58 therewith, the latter are supported by the guide arm 99 and by reason of the pivotal connection of the cross-bar 105 with the slide 100, the inner ends of the rear harrow sections counteract.

In operation, the rear sections of the harrow are arranged for adjustment reversely of the front sections, that is, when the inner ends of the frontsections are adjusted rearwardly, the inner ends of the rear sections are adjusted forwardly, and in order to effect such reverse adjustment simultaneously, the slide 100, which controls the adjustment of the rear sections, is connected through intermediate connecting means with the upper end of the lever 95 which effects the adjustment of the front sections. This intermediate connecting means comprises a link 108 pivotally connected at its rear end to the sliding member and having the forward end pivotally connected at 109 to the upper end f an arm 110 which latter is horizontally pivoted at 111 on the knuckle 80. This knuckle is vertically pivoted at the rear end of the rearward extension 35 of the angle plate 33, which arrangement permits the arm 110 and link 108 to swing with reference to the front frame of the harrow or vice versa, as may be required to enable the rear sections of the harrow to properly trail after the front sections, or enable the front sections to ,be turned independently of the rear sections in turning the machine to one side or the other. The forward end of the link 108 is' preferably provided with a number of bolt holes 112 for the bolt 109 so as to permit length-' ening or shortening of the connection between the slide 100 and the rocker arm 110. The rocker arm 110 has a knuckle 113 horizontally pivoted thereto ad'acent the upper end and a link 114 is vertically pivoted to this knuckle 113 and has the forward end pivotally connected to the upper end of the lever 95, as shown.

Instead of the connection just described of the link 108 with the lever 95. a construction such as shown in Fig. 16 may be ein-- ployed. In such construction the arm 110 is omitted and the knuckle 113 which is vertically pivoted to the rear end of the link '114 is horizontally pivoted directly to the forward end of the link 108.

The link 114 is preferably provided with a plurality of bolt holes 125, to afford an adjustable connection thereof with the rocking lever 95 and the bolt holes 112 are omitted from the link 108.

\Vith this construction, the knuckle 80 is omitted and the yoke 78 pivotally mounted directly on the upper face of the rearward extension 35 ot' the angle plate 33, thus correspondingly lowering the forward extremity of the bars 71 and permitting the llIlk \link 114 therebetween, and limit the lateral movement of the link.

Cleaning devices are provided for the disks of the front and rear harrow sections comprising scrapers 115 which are mounted so that they maybe shifted to and from the concave surfaces of the disks 5. The scrapers 115 of each section are connected together and slidablv or swingingly mounted on a support in any convenient manner. I have shown the rear sections each with a lever 116 for adjusting the scraper blades and the forward sections, each with a cam lever 117 for adjusting the scraper blades. The scraper blades may be arranged to be held by friction in the adjusted position, or as shown in connection with the forward sections may have a spring 118 which normally forces and holds the scrapers out of engagement and against the tension of which the cam lever 117 operates to engage the scrapers against-the disks 5.

It is to be particularly noted that the draft connection of the rear sections of the harrow is effected by the extensible links 61 and 62 and that the rear frame of the harrow comprising the bars 71 does not have a draft connection with the front sections or front frame, but merely has the front end thereof loosely engaged with the front frame to permit the rear frame to move freely forwardly or rearwardly with res ect to the front frame as the draft connections 61 and 62 may require to enable the rear.

\ This connection of the forward end .of the rear frame with the front frame may be made in any suitable manner so as to permit this operation, and in Fig. 15 .I have shown a modified form of connection which may be employed if desired. This modified form of connection comprises a seat for the forward end of the rear frame which seat consists of a plate 119 which restsupon the rear end-of the rearward extension 35 of the angle plate 33 and has a yoke 120 secured on the upper face thereof by bolts 121 and provided with vertical arms engaging at oposite sides of the forward en of the rear I rame. ,A pin or bolt 122 is inserted throu h the upper ends of' the-vertical arms over t e forward end of the rear frame so as to loosely confine same in the yoke. Both of these plates 120 and 119 have matching oppositely arranged arcuate slots 123 through which bolts 124 are passed, which bolts are secured in apertures at the rear end Ill ' sections.

of the extension 35 to hold the seat member thereon. This seat member by reason of its slotted connection with the bolts 124 is capable of turning onthe upper face of the extension 35 so as to adapt itself to the trailing or swing movement of the rear frame.

In the operation of the harrow a tractor or other suitable pulling means is connected to the draft clevis 93 of theharrow andthe pulling strain thereon maintains the plates 90 at either extremity of movement thereof, with the bolt 94 engaged in either extremity of the slot'92. Assuming that the disk sections are in the positions shown in Fig. 1, in which positions the adjusting lever 82 is positioned as shown in Fig. 4 and the clevis bolt 94 engaged a ainst the upper end of the slot 92, if it is esired to adjust the harrow sections at an inclinationto the line of in throwing the lever 82 to the extremity of its movement, at which point the bolt 94 engages the lower end of the slot 92. The

first half movement of the lever 82 and corresponding adjustment of the disk sections is effected with comparative ease and itis the latter half of the adjustment which is accomplished with the greatest difficulty without other than manual power, and the arrangement therefore which I have provided whereby the draft on the device serves to facilitate the latter portion of the movement of the lever 82 and consequent adjustment of the disk sections relieves the operator of the labor and difficulty ordinarily required to effect the adjustment ofthe disk Furthermore, the lever. 82 being at the forward end of the harrow adjacent the draft connection therewith enables the operator, in case a tractor is employed, to

adjust the disk section from his position on the tractor.

From the foregoing it will be observed that there are two principal adjustments of the disks determined by the length of the slot 92, and the position of the segment 85' corresponds with that of the lever 82. For varying the position of the disk sections in either of these positions of principal adjustment, the lever 82 is arranged to co-operate with the notches 86 of the segment to permit a limited adjustment of the disk sections by moving the lever 82 independently of the segment 85 to some extent in either of the two positions of adjustment of the latter.

When the harrow is drawn along a straight line the draft links 61 and 62 connecting the rear harrow sections with the front sections or frame are extended their full length and the forward ends of the bars 71 of the rear frame project through the holder 78, as shown in Fig. 6, and no pull is exerted on the forward ends of the bars 71 by reason of the loose connection. is drawn along a curved path, as for example in turning a corner, the front harrow sections are swung directly by the front harrow frame 11-12 according to the changed line of direction. The rear harrow sections being loosely linked to the front frame or sections tend to assume the position in which they will most easily follow the front sections in making the turn, the sections at the inside of the turn coming closer together as the inside link, as for example, 61, as shown in Fig. 3, collapses sufficiently to permit the rear sections and front sections to assume the natural relative positions to readily make the turn. During such turning movement the rear frame swings laterally with respect to the front frame, such swinging movement being permitted by the swinging connection of the holder 78 on the rear end of the stub tongue and the rear frame advances slightly, the forward ends of the bar 71 sliding forwardly through the holder 78.

Thus it will be observed that I have provided an extremely flexible construction having a separate draft connection for each rear section with the front section or frame,

which permits any relative movement of the front and rear sections required to enable the harrow to make turns easily and without interference.

While I have shown and described a single practical embodiment of my invention, I

am aware that various changes and modifications may be made therein without departing from the principles of my invention, and I therefore do not propose limiting the patent granted hereon, otherwise than as necessitated by the prior art.

I claim as my invention:

1. In a disk harrow, the combination of a front pair of disk sections, each having a separate draft connection, and a rearpair of disk sections, each of the latter having an independent yieldable draft connection with the draft connection of the corresponding front section, so as to permit the corresponding front and rear sections to approach, or recede from, one another at the will of the operator, and means for simultaneously adjusting both sections ofvthe rear pair angularly to the direction of movement of the harrow.

2. In a harrow, the combination of a pair of front disk sections and draft frame therefor, a pairof rear disk sections, independently collapsible spaced draft connections extending from said draft frame respec- When the harrow tively to each rear section, and means for simultaneously adjusting both rear sections in a plurality of angular positions to the line of draft.

3. In a harrow, the combination of a pair of front disk sections and a pair of rear disk sections, a draft frame for the front sections, a frame separating the rear sections and having a connection with the draft frame of the front sections at the center, and independent draft connections for each rear section connected at spaced points to the draft frame of the front sections, all of said connections being loose so as to permit the front and rear sections to approach,-

or recede from, one another at the will of v the operator.

4. In a harrow, the combination of a pair of front disk sections, a front draft frame connected with the sections intermediate of their ends, a pairof rear disk sections each having an independent draft connection interme iate of its ends-extending forwardly and pivotally connected to thecorresponding side of'the front frame, a rear frame for holding the rear sections in spaced relation and having the forward end slidably connected with the front draft frame, and means on the rear frame connected with each rearv section and operable independently of the sliding connection for adjusting the rear sections in a plurality of angular positions to the line of draft of the harrow.

5. In a harrow, the combination of a pair of front disk sections, a laterally extending draft frame pivotally connected with each of said harrow sections intermediate of their ends, a air of rear disk sections, a rear frame plvotally connected with each rear section intermediate of their ends for holding said sections in spaced relation and having a connection with the front frame permitting movement thereof to and from the' front frame, and in independent draft means connecting an intermediate portion of each rear section with and variably distancing same fromtthe corresponding side of the front draft frame.

6. In a harrow, the combination of a pair i of front disk sections, a draft frame having lateral extensions piwotally connected respectively with said disk sections intermediate of their ends, a pair of rear disk sections,

a rear frame pivotally connected with the tions pivoted to the rear frame, and an independently operable draft connection between each rear section and the corresponding front section adapted to slack up as the harrow is drawn in a curve'd'path so as to permit the front andrear sections at the inside of the curve to approach one another.

8. In a harrow, the combination of a pair of front disk sections and a pair ofrear disk sections, means for holding the latter in spaced relation, an independently operable draft connection for each rear section, and means for adjusting the rear sections at a plurality of angular positions to the line of draft of the harrow, said means being adaptcally alter their relative angular positions to facilitate movement of the harrow as it is v drawn in a curved path.

9; In a harrow, the combination of a pair of front disk sections and a pair of rear disk-sections, and a draft frame therefor, the sections of one pair being arranged in staggered relation, and means for simultaneously adjusting all the sections at various angles to the line of draft so as to retain the staggered relation of the one pair when adjusted.

10. In a harrow, the combination of a pair of front disk sections, a pair of rear disk sections loosely connected so as to approach and recede collectively and individually to and fromthe front disk sections, and means for simultaneously adjusting all of the sections in a plurality of angular positions to the line of draft of the harrow.

11. In a harrow, the combination of a'pair of front disk sections and a pair of rear disk sections loosely connected so as to approach, and reeede from the front disk sections collectively or individually at the will of the operator, and adjusting means for simultaneously moving the inner ends of the rear sections forwardly and moving the inner ends of the front sections rearwardly.

12 In a harrow, the combination of a pair of front disk sections and a pair of rear disk sect-ions adaptedto swing at the rear of the front disk sections. correspondingly swinging frames for each section, and means for simultaneously adjusting the front and rear sections, said means being provided with a swivel connection substantially co-axial with the swinging connection of the rear sections with the front sections.

13. In a disk harrow. the combination of a pair of front disk sections, having a draft frame extending forwardly therefrom, a pair of rear disk sections loosely-connected with the draft frame to approach, or reccde from, the front disk sections collectively or individuallyat the will of the operator, and

an adjusting means at the forward end of said draft frame for adjusting all the disk sections angularly to the line of draft of the harrow.

14. In a harrow, the combination of a frame having a disk section adj ustably connected therewith, and an off center adjusting means operable by the draft pull to either side of the center after a preliminary manual movement to the center position,to adjust the disk sections relatively to the frame.

15. In a cultivator, the combination of a frame having adjustable cultivating devices and a draft connection on said frame adapted to adjust the cultivating devices relatively to the frame to either of two positions, and means for adjusting the cultivating. devices in either position independently of the draft connection.

- 16. In a disk harrow, the combination of a' frame having adjustable disk sections thereon, a draft member optionally. .mov

able to positions at either side of a center position by the draft pull thereon, and means connecting said draft member with the disk sections so as to regulate the adjustment ofthe. disk sections by the ad usu ment of the draft member.

17. In a harroW, the combination of a frame having adjustable sectionsthereof, an adjustable draft member adapted to be held at either extremity of its movement by the draft pull thereon, connections for adjusting the disk sections with the draft member, and manually operated means for regulating the adjustment of the draft member.

18. In a harrow, the combination of a frame having disk sections adjustably connected therewith, a draft connection, a pawl segment operable by the draft connection to either of two positions for adjusting the disk sections, and a lever adjustable along and interlocking with the pawl segment for adjusting the sections independently of the draft connection.

HENRY S. SMITH.

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