US2616352A - Resiliently mounted disk tiller - Google Patents

Description

NOV. 4, 1952 JOHNSTON 2,616,352

RESILIENTLY MOUNTED DISK TILLER Filed Aug. 15, 1947 2 SHEETSSHEET l INVENTOR. HowARn MJmms TON ATTOE/VEY Nov. 4, 1952 H. JOHNSTON 2,616,352

RESILIENTLY MOUNTED DISK TILLER Filed Aug. 15, 1947 2 SHEETSSHEET 2 INVENTOR.

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ATTORNEY Patented Nov. 4, 1952 "UNITED PATENT OFFIC 'HowardiMJohnston, Toronto, Ontario, Canada, "assignor to'Massey-Harris Co.'Ltd., Toronto, Ontario, Canada, a corporationof Canada Application August 15, 1947, Serial No. 768,867

(Cl m- 153) .il'gClaim.

The present invention is-adapted tax-be: usedas an attachmenton 'disc' tillers such asisa illustrated in my application -for=patent,Serial'-Num- -ber523,131, filed February l9, l944,-:which matured into'U.*S. Patent No.- 2,426,354:and issued August 26, 1947, entitled Disc 'Iiller. In this' design the frame has-considerable .weight: and the discs are held definitely to a certain depth:=re1ative to the frame. Therefore whentilling stony ground with a large stone near or at the surf-ace of the ground its contact-with adisc or discs places a great strain on the mechanism because of the Weightof 'theframe.

out adding very greatly to .the cost ofthe-device.

Objects of the present-invention are toprovide means whereby the yielding means may bemade inoperative by the .simp1e,.use:of:;an additional bolt and whereby the yieldingemeansrmay be manually adjusted.

'To these'and'other usefulxendsmy invention consists of parts, combinations of-parts or their equivalents and mode of "operation; as hereinafter described: and claimedand showninithe accompanying drawings inewhich:

Fig. l is a top .viewpfa disc tiller asshownin my United States Patent -,No. 2,42.6,354;;and equipped with my stone; jumpin device.

Fig. 2 is a fractional left end vlew of 'the-.-.device shown in Figure 1.

Fig. 3 isan enlarged leftasidei sectional view of the present-invention in a normaloperating position.

Fig. 4 is a View similargto Figure 3 except illustrating the. action. of the device when ,the ,discs are forced to ride over an obstruction.

Fig. 5 is a section taken; on lines:.5#5 .of=-.Eigure 3.

Fig. 6 is a section taken onilines-i- -s-of 'Figure 5.

Fig. 7 isan enlarged elevational iviewnsim-ilar to Figure 5 of myyUnited-r States Patent No. 2,426,354.

As thus illustrated the disc gang is designated by reference -character.A and the -left end frame of the device is designated in its entirety by reference characterB. "The hitch of my gdevicein its entirety is designated by reference character C. 1

Member A comprises arelatively large tube .10 having spaced arms I! whi ch.,are securedto the tube, the rear ends being'suitably connectedto disc gang bearings "l2. "Discs13'are securedto a *sh'aft'which is rotatably mounted in bearings 12.

Tube I is rotatably mounted on a main frame member or shaft .1 5,. the. shaft formingv a rigid connection between member B and .a bracket. [6 to which -.a carryingand guiding; wheel. I!v is rotatablyattached bysmeans .of-an.axle I8, the axle having secured-thereto an armi l9. Hitch mem- :ber C hassadraw. link20 which is pivotally attached. as .at 2 l,. its frontpbeing adapted .to be attached .-tothe draw bar .of-.a tractor and hav- -.ing.a-:link connection: 22 to arm l9 whereby wheel .H :Will? be guided, inits direction of ,travel by thetractor, through.1inkp20. ,The rear end of member- B has a bracket 25 (see Figure ,2) into which anaxle, 26 is vertically ,pivotally mounted, theaxle at its rear end having rotatably mounted thereona rear furrow carrying wheel 27.

Wheels Hand 2'lz-,have-means..for vertical. adjustment relative to bracket. 16:;and member .25.

.The, forward end of member B has rotatably mounted thereon a land wheel 28 with a power lift; clutch 29 having a crank 30 with connections whereby; thediscs ,l3 may be-raised and lowered to incp a neand. e a epos io y-tu n tube jllon frame member 15,. and having a for- ..wa-rdly extending shaft 3I- -whereby the operator from the seat-on thetractor may; regulate the .depth cut by the disc-as in United States Patent Itwill be seen that. wheel28 acts to definitely raiseandlower the discs on; gang A. If a serious obstruction. is. met, for, example a large stone .whichis near .the surfaceof the ground, in order to ride over the stone the v.discjgang will be required to lift; either the front or rear end or both ends of the device, unless the machine is equipped with-m present invention.

, Applicants structureqas shown in the figures .is designed. so. the liftingof the discs eitherby an unyielding obstruction such. as a large stone near'the: surf-ace ofthe ground, I provide means 'wherebythe discs will be permitted to ride over "the obstruction by overcoming springs supplied for-the purpose'and without raising the frame of thedevice.

I will now describe my stone jumping attachmentormeans whereby the-discs are yieldingly held-to the -desired depth.

Referring specificallynow to Figures 3, 4, 5, 6 and K ln-Figure "7, I-haveillustrated a mechanism for raising and lowering the discs and manually regulatingthe depth-of the-disc similar to that tshovvn in said- United States- Patent 'No. 2,426,354. 1 1m Figures 1 through 6, I illustrate my improved-means for-yieldingly holding the 3 discs in the predetermined depth as determined by the power lift and manually operated controlling means.

Crank 36 is adapted to make a one half turn every time lever 32 is pulled. When the crank is in its upper position the discs will be in an operating position and when the crank is in its lowest position the discs will be in an inoperating position as follows:

Two split brackets 33-33 are rotatably mounted on tube I0, each have sectors 34--34 integral therewith. Two upwardly extending, parallel arms 35-35 are pivoted to sectors 34 as at 36. Sectors 34 each have a slot 31 which is positioned on a radius with bolt 36. Arms 35 have bolts 38 secured thereto which extend through slots 31 so members 33 may turn on bolts 36 as axes thus forming knuckle joints between members 33 and 35. A forwardly extending arm 45 is secured to pipe H]. A bracket 46 extends downwardly between arms 35 and having trunions 41 on opposite sides which extend through openings in arms 35. Member 46 has at its upper end a bevel gear housing 48, one of the bevel gears being operatively connected to shaft 3| and the other being screw threaded to a bolt 49 which is pivotally connected to arm 45 as at 50 and extends freely through bracket 46 to the bevel pinion into which it is screw threaded.

Thus by turning shaft 3| tube may be turned on shaft I for manually controlling the operatin position of the discs. Arms 35 are secured together at their upper ends by bracket 5| the bracket having a forwardly extending trunnion 52 which is operatively connected to crank 30 by means of blocks 53 and 54 and a forked connecting link 55 the forks being pivoted to the blocks as at 56 and 51. The upper end of link 55 is preferably screw threaded into the upper fork as at 58 as illustrated, for adjusting purposes and so crank 30 need not be parallel to tube l0.

Thus the position of arms 35 is determined by crank 30 and the position of arm 45 relative to arms 35 is determined by shaft 3|. Clearly discs |3 are raised and lowered by the power lift and regulated manually by means of shaft 3|.

Arms 65 and 66 are secured to members 33 having at their forward ends eye bolts 61. Brackets 68 are secured to the upper ends of arms 35 each having eye bolts 69 with nuts 16. Eyebolts 61 and 69 have therebetween pull springs 1|, the springs acting to pull upwardly on the forward ends of members 65 and 66 and urge members 33 clockwise. Nuts may be used for adjusting the tension of these springs, thus to regulate the yielding pressure adapted to hold the discs in the ground and to hold bolts 38 against the forward ends of slots 31.

It will be noted that the plane of pivot bolt 36 and trunnions 41 is slightly in front of the center of shaft |5 thus forming an offset knuckle joint. Therefore when the discs are forced over a serious obstruction the tendency of members 33 is to turn anti-clockwise against the pull of springs 1| (see Figure 4). It will be seen by scrutinizing Figure 3, that pivot bolt 56 is held in position by arms 35. Clearly since pivot bolt 36 is only slightly forward of the center of shaft |5, it will require but moderate size springs to hold the discs in their working position.

Slots 31 determine the extreme positions of tube l0 and it willbe seen that when the discs have passed over the obstructions the springs will again force the discs to their original depth.

When it is desired to lock the discs against a yielding upward movement a bolt 12 (see Figure 6) is positioned in rear of members 35 and through the rear end of slots 31. The end of the slot through which bolt 12 extends is clearly shown in Figure 3. Thus when this bolt is used, the device will operate exactly the same as U. S. Patent No. 2,426,354 or in the design shown in Figure 7.

It will be seen that my improved stone jumping attachment may be conveniently installed on the disc tiller shown in U. S. Patent No. 2,426,354, that many parts shown in Figure '7 are interchangeable with parts used on the present invention and that when so installed, when desired the yielding means may be made inoperative; and that the device is simple, easily manufactured, easily understood and is efficient.

Clearly many minor detail changes may be made in the design shown without departing from the spirit and scope of my invention as recited in the appended claim.

Having thus shown and described my invention, I claim:

In an automatic release for a disc tiller, a main frame shaft with a carrying wheel mounted on its front end and two carrying wheels mounted on its rear end, a tube rotatably mounted on said frame shaft having rearwardly extending arms secured thereto and a disc gang rotatably mounted on the rear ends thereof, a half turn power clutch mounted on one of said carrying wheels and having an operating connection to said tube for raising and lowering said disc gang by turning the tube, said power lift operating connection to said tube comprising in combination, a forwardly extending arm secured to said tube, brackets rotatably mounted on said tube and on opposite sides of the forwardly extendin arm, parallel and upwardly extending arms near the upper end of which is operatively connected said power lift clutch, the rear lower end of said parallel arms being pivoted to said brackets, the parallel arms being operatively connected to the forward end of said forwardly extending arm, said brackets each having forwardly extending lever arms, springs operatively connecting the forward ends of the lever arms and said parallel arms near the upper end thereof, a stop associated with said brackets and the lower end of said parallel arms to stop said brackets before said pivotal connection between said parallel arms and said brackets reaches dead center, whereby when said disc gang is forced to ride over a serious obstruction, saidbrackets will be caused to rotate and overcome the pull of said springs and cause said bracket to travel forwardly and. permit said disc gangs to raise on the pivotal connection of said forwardly extending arm as an axis, and whereby after the discs pass over the obstruction, said springs will return the brackets and disc gang to their operating positions.

HOWARD M. JOHNSTON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 640,858 Bartholomew Jan. 9, 1900 1,524,369 Ramage Jan. 27, 1925 2,426,354 Johnston Aug. 26, 1947

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