US1838657A - Sharpening attachment for disk harrows - Google Patents

Description

Dec. 29, 1931. F. M. CASE SHARPENING ATTACHMENT FOR DISK HARROWS Original Filed Sept. 15, 1926 2 Sheets-Sheet luvs/Iron F'xM/vc/s H Case.

Dec. 29, 1931. F. M. CASE SHARPENING ATTACHMENT FOR DISK HARROWS Original Filed Sept. 13, 1926 2 Sheets-Sheet 2 entree FRANCIS M. CASE, OFCLEVELAND HEIGHTSOHIO, ASSIG-NOIR TO OF' CLEVELAND, OHIO- PATENT OFFICE. a

omens enamels,

I V SHARPEINING Arracnnnnrron DISK minnows Application filcd September 1a, 1926, Serial No. 135,070. Renewed. H es, 1931.

This invention relates to sharpening at tachments for dlsk harrows and 1s more partlcularly directed-to a; sharpeningjdevlce which may be supported so as toengage the 5 disk of a harrow to sharpen the same while i latter is adjustably mounted so that it may be moved from one disk to the next of any one in a line withoutremoving the sharpening device from the support.

Another object of the invention is to provide sharpening device which when positioned adjacent one of said disks is maintained in cutting or sharpening engagement by means of an adjustable tension member which forms a part of the sharpening device.

Other objects of the invention are to provide a sharpening device which may be transferred from onegang of disks of a harrow to another gang of disks of" the harrow, where the convex surfaces of the disks of each gang are opposite to'each other, by

merely removing the sharpening device from.

the support of one gang and reversing it on a supporting means of the'adj acent/gang' of disks. i i V A further object of the invention resides in the provision of ameans upon the sharpening device for. positioning the .cutterwith respect to the edge of the diskxto bejs'harpened so that this cutter may be radially adjusted depending 'upon the direction in which the convex 's'urfaceextends and the direction of rotationof the disks. V j

A still further object resides in-a means '40 forwsecurely positioning and mounting the supporting means with respect to'the hub of the gang ofdisks so as to prevent the sharpening device if becoming loosened, from dropping down onto the cutting edge 4 of the disks.

A With the objects above indicated and other objects hereinafter explained in view my invention consists in the construction and combination of elements hereinafter described and claimed.

Referring to the drawings:

Fig. l is a cross sectional view taken on line 11 of Fig. 6 showing the position and arrangement of-the attachment with respect to the disks of the harrow; I

Fig. 2 is a horizontal cross sectional view on line 2-2 of Fig. 1 showing the relative position of the cutter with respect to the cutting edge of the disk with the yokein section. 3

Fig.3 is a top plan view of Fig.2showing the reversible feature of the yoke. Fig. 4 is an end'view looking toward the disk in Fig. 2.

Fig. 5 is a top plan view similar to Fig. 2

but showing the sharpening device in the position it assumes when being transferred from one disk toanother, the lineA-A representing the extremities of the peripheries of a. gang of disks."

Fig. 6 is a rear end view of a ang of disks showlng the supporting means or the uide bar and the sharpening device posit oned with respect to one of the disks. 7 j Fig. 7 is a segmentary view showing a modified form of the supporting and spacing arm engaging the hub of the disk.

Fig. 8 is a segmental-y view showing a. further modified form to that shown" in Fig. 7. a

Fig. 9isa modified form of sharpening device whereby a shar ening wheel has been substituted in place o v the cutter, and

Fig. 10 is a top plan v'iewof the arrangement'shown in Fig.9. n

In the drawings, 1 indicates one of the disks of a gang and 2 represents the-usual hub connection between the disks 1,-these disks and hubs being secured togetherin any suitable means. one form of means being a square boit extendingentirely through the hub and disks as indicated at?) in Fig. 1. As shown 'in'Fig. 6, 4 indicates bearings positioned around the hubs between the end disks of the gang and extending upwardly from these bearings 4' are arms 5adjustably mounted therein, the upper ends of which are riveted to a cross bar 6 usually employed as a supporting means for thescrapers of the various disks. This cross bar 6, however, may be any .1

other portion of the harrow which extends achacent the peripheries of the disks 1.

A guide rail 7 in the form of a T rail extends parallel with the cross bar 6, the web of the T rail extending upwardly and at a slight incline toward the vertical central line of the disks. An arm 8, T-shaped in cross section with the web extending upwardly is provided with a transverse slot 9 at one end engaging with the web of the guide rail 7 and is adjustably mounted thereon and secured thereto by means of a set screw 10 extending through an opening in the end of the arm into engagement with the web of the guide rail 7 Directly above the transverse slot 9 and transversely thereof is an arcuate flange or rim 11 formed integral with the web of the arm 8, a cross section of which is T- shaped. A supporting bracket 12 is provided with a right angled extension 13 through which. extends a T slot adjustably engaging the arcuate flange 11 of the arm 8. This supporting arm 12 is maintained in adjusted position by means of a set screw 13a extending through the T slot of the right angled extension 13 and into engagement with the periphery of the arcuate flange 11. A hook bolt 14 extends through one of a plurality of openings 15 in the supporting arm 12. the hooked portion engaging the lower end of the cross bar 6 and is held in engagement therewith by means of a nut engagingthe screw threaded end eXt-endin g beyond the supporting arm 12.

The opposite end of the arm 8 extends at a downward angle and inwardly toward the horizontal center of the disks and has slidably mounted thereon a bracket 16 which is provided with a T slot adapted to engage the T head of the arm 8. A depending arm 17 is formed integral with the bracket 16 and et-rtends downwardly and under a portion of the hub 3. The bracket 16 on the arm 8 is ad. justably secured through a set screw 18 eX tending through the bracket 16 into the slot and into engagement: with the head of the arm 8. VBy this adjustment the guide rod 7 may be securely and correctly positioned with respect to the peripheries of the disks 1 so that the sharpening device is correctly position'ed along the cutting edge of the disk 1 while the same is being sharpened.

It is sometimes desirableto prevent the possibility of the arm 8 being pulled away from the hub 3 and in such a case the bracket 18 may be made in the form shown in either Figs. 7 or 8. v

A yoke 19 is provided with a pair of transverse slots 20 one of which engages the head of the guide rail 7, these slots being positioned on each side of the horizontal. center of the bracket and extend at opposite angles so that the bracket may be reversed on the guide rail 7 at will, depending, of course, upon the direction in which the convex surfaces of the disks 1 extend. A. hell crank is pivotally mounted within the yoke 19 by means of a pin 22 extending through the arms of the yoke and the bearing of the bell crank. One arm 21a of the bell crank 21 is provided with a bifurcated end 23 which receives one end of an eye bolt- 24, the ends being pivotally secured together by means of a pin 25. This eye bolt 2-1 extends through a slot 26 provided in an extension 27 formed integrally with the yoke 19 and a Washer 23 engages the extension 27 and acts as a seat for the spring 29 disposed upon the l idy of the eye bolt 24. The opposite end of the bolt 24 is screw threaded and receives a wing nut 30 which engages with the end of tie spring 29 the turning of the wing nut o adjusting the tension of the spring 29.

The other arm 21b of the bell crank 21 is formed to receive the cutting tool 31. This cutting tool 31 is seated in a semi-circular groove 32 which is formed on the inner side of the arm and extends throughout the length. An eye bolt 33 is provided with a squared opening 34: which receives the cutting tool 31, the body of the eye bolt 33 extending through a slotted opening 35 in the arm of the bell crank 21 transversely of the slot 32. The opposite end of the eye bolt is provided with screw threads 36 which receive a wing nut 37, the tightening of which secures the cutting tool 31 within the groove 32. The outer surface of the arm 21?) of the bell crank 21, adjacent the slot 35, is provided with diverging tapered surfaces 39 and a washer 38 is interposed between the tapered surfaces 39 and the Wing nut 37. Upon the tightening of the wing nut 37 the washer 38 may be brought into contact with either of the tapered surfaces 39 which thereby dc- T? termines the angular position of the cutting tool 31, this angular position depending upon the direction in which the convex surfaces of the disks 1 extend. The slot 32 extends throughout the inner surface of the arm 21?) of the bell crank 21 so that the cutting tool 31 may be shifted longitudinally to utilize the entire cutting surface thereof.

It is sometimes desirable to construct a supporting arm such as indicated at 8 which will prevent accidental longitudinal movement of the same, after it has once been properly located and secured with respect to the guide rail 7. Two constructions are shown clearly inFigs. 7 and 8 wherein, in Fig. 7, the supporting arm 8 is formed of a T section with the head of the section extending downwardly. This T section slidably receives a bracket 40 provided with a T shaped slot adapted to engage the head of the sup- P porting arm 8 and is secured in an adjustable position by means of a set screw 11. A U- shaped portion l2 substantially surrounds the hub 3 and is integrally formed with the bracket 40, the depending arms of the U- aped po tion. 41-2 ex end ng :Ear enough downwardly beyond the horizontal center of the. hub 3to prevent longitudinal movement of the bracket when once secured. i the proper position. i

In F 8 the supporting arm 8 is formed of a T section and has slidably mounted thereon a pair of brackets 43 provided with T shaped slots adapted to engage the head of the supporting arm 8. These brackets 43 are secured in the desired position by means of set screws 44 and the brackets are provided with converging, depending arn1s45 which. project downwardly substantially below the hub 3 and inolose proximity thereto. This construction also prevents appreciable longitudinal movement of the supporting arm 8 so that the T rail 7 when once? properly located is maintained in this proper position.

It sometimes further desirable to employ a grinder in preference to the cutter 31 which has been heretofore described. This modification is clearly disclosed in Figs. 9 and 10. The constructionof the yoke and its associated parts are substantially the same as the yoke 19 heretofore described except that the tool holder arm 21]) of the bell crank 21 is omitted and the arm 46 substituted therefor. This arm 46 forms one arm of the bell crank 21 and is provided with ahead or enlarged circular portion 47 which has a central bore i8. A bushing 49 closed at one end is positioned in the opening 48 and frictionally secured therein and positioned by means of an annular flange 50 engaging with the inner surface of the head 47. The grinding wheel 51 of proper diameter has a counterbore 52 in itsupper surface and acentral opening 53 extends through the grinding wheel 51. This central opening 58 receives a bushlng 54 and a stub shaft 55 is securely fastened to the under side of the grinding wheel 51'by means of a bolt 56 extending through the bushing 53 and into a centrally disposed screw threaded opening in the end of the stub shaft 55. The outside diameter of the stub shaft 55 is less than the inside of the diameter of the bushing 419, so that the stub shaft 55 may easily rotate within the bushing. A thrust-bearing or ball 57 is pocketed within the end of the bushing d9 and engages with the lower end'of the stub shaft 55 and functions to permit the grinding wheel 5.1 to freely rotate.

' F 6 clearly shows the relative position of the'various parts of the supporting means and cutting device, the cutting device'being in engagement with one of the disks l of a gang. lVhen it is desirous to sharpen the 1 ing edge of the disks 1, referring particu arly to Fig. 1, the sharpening attachment 1' positioned as shown therein and the eye bolt carrying the cutter 31 is shifted radially downwardly onto the lower diverging portion'39 of the arm 216. This posi ons. t e cu ing edge of the utte 3 a a slight anglev with respect to the cutting edge 1 is regulated through the tension spring 29, the tightening of the wing nut 30 increasing the tension of the cutter 81 on the disk 1 and the unscrewing or loosening of the wing nut 30 releasing the tens on on. the sprlng 29and Su sequently affecting the tension between the cutter 31 and the disk 1. When one of the disks '1 has been sharpened and it is desirous to sharpen the adjacent disk or any otherdisk in the'gang, the wing nut 30 is loosened to an extent to permit the washer 28, around the eye bolt 23, to be swung beyond the end of the extension 27 and out of the slot 26. This permits the sharpening device-to be positioned as indicated in 5 and slid along the guiderail 7 passing the V outer peripheries of the. disks 1 which is indicated by line A-A of Fig. 5. Vvllel the sharpening device has been moved along the guide rail-7 to a position adjacent the-disk to be sharpenedthe eye bolt 28 is swung back into the'slot 26' of the extension 27 andjthe washer 28 is again adapted to engage the rear surface of the extension '27. This positions the cutter 3,1 in substantially the same position as indicated in Fig. 2 and the tension of the cutter 31 against the disks 1' can be adjusted by means of the wing nut 30 as has been heretofore. described.

The positioning and the adjustment of the grinding Wheel 51 and the tension of the grinding wheel 51 against the disk 1 is regulated in, the same manner as has been heretofore described. The tension of the grinding wheel 51 against the cutting edge of the disk lis increased by turning the 'wing nut 30 downwardly thereby increasing tension of the springs 29. and to. relieve the tension be-.

tween the grinding wheel 51-and the disk 1 thedirection of rotation ofthe wing nutls reversed. The sharpening device is adjusted from one disk'to another inthe same fashion as that. described with respect to Fig. 5.

disks of the adjacent gang where the disks are arranged oppositely to. those shown in i ine o h k h iroi on sa g of- Fig. 6, it is necessary to remove the yoke 19 from the guide rail 7 and to support the yoke 19 on the opposite rail and from the opposite slot 20 of the yoke. It should be noted that this reverses the position of the cutting edge on the disk and in order to attain the proper shearing cut the wing nut 37 is loosened and the eye bolt 33 is swung laterally so that the washer 38 engages the oppposite diverging surface 39 thereby swinging the cutter 31 around until the proper edge engages with the cutting surface of the disk 1. It is also necessary to remove the set screw 58 which secured the yoke 19 to the guide rail 7 as shown in Fig. 1 and to place it in the screw threaded opening directly opposite thereto thereby securing the sharpening device in its reversed position on the rail 7 of the adjacent gang.

Having thus described my invention, what I claim is:

1. A. sharpening attachment for disk harrows comprising a guide bar extending transversely of the disks, means for adjustably mounting said guide bar on a portion of a harrow, a supporting member adjustably mounted on said guide bar and provided with a p votal tool holder, 3. cutting tool mounted for angular adjustment around its longitudinal axis in said tool holder and adapted to engage a disk to sharpen the same, and a tension regulating device engaging the supporting member and the tool holder to maintain the proper tension between the cutting tool and the disk.

9.. A sharpening attachment for disk harrows comprising a guide bar adapted to be mounted on a portion of the harrow and extending at right angles to the disks, means for adjusting said guide bar with. respect to the peripheries of said disks. a supporting member slidably mounted on said guide bar. said member having a pivotal tool holder. a cutting tool adjustably mounted in said tool holder and adapted to engage the. disk to sharpen the same, and pressure exerting means attached to the supporting member and the tool holder for creating pressure of the cutting tool on said disk.

3. A sharpening device. for disk harrows comprising a voke provided with a groove adapted to slidably engage a portion of said harrow. extending aXiallv along the disk gang a pivoted tool holder secured to said yoke, cutting means carried by the said tool holder. and a tension means attached to the yoke and the tool holder.

4. A, sharpening device for disk barrows comprising a yoke provided with oppositely disposed grooves adapted to slidably en re a portion of said harrow, a bell. crank nivo. to the yoke. one arm serving tool. holder, a cuttin g tool adj ustably mounted in sa d arm, and a tension spring attached to the other arm of the bell crank and to a portion of the yoke.

5. A sharpening device for disk harrows comprising a yoke provided with a pair of oppositely disposed grooves, adapted to slid ably engage a portion of said harrow, a bell crank pivoted to the yoke, one arm serving as a tool holder, a cutting tool mounted in said arm and adapted for angular movement, a bolt pivotally secured to the end of the opposite arm of the bell crank having the other end removably engaging the yoke, a spring surrounding the bolt and engaging the yoke, and a means engaging the bolt for adjusting the tension of the spring.

6. A sharpening device for disk barrows comprising a yoke provided with a pair of oppositely disposed grooves for positioning the device with respect to the disks, :1 cuter holder pivoted to the yoke, a tension adj Lating device mounted between the yoke and the cutter holder, a cutting tool mounted for longitudinal adjustment in the cutter holder, and means for angularly adjusting the cutting tool for properly positioning the tool with respect to the disk.

A sharpening device for disk barrows comprising a yoke provided iv'th a pair or" oppositely disposed grooves for positioning the device with respect to t the no edge of disk to be sharpened, a cut 'er holder pivoted to the yoke, a tension device attached to the yoke and the cutter holder, a cutting tool mounted in the cutter holder, and means f r angularly adjusting the cutting tool so as to effect a shear cut on the edge of the disk as it rotates, the adjustment dependint upon the slot from which the device is suspended.

8. A sharpening attachment for disk harrows comprising a yoke provided with transverse grooves adapted to slid-ably eng a portion of said barrow, a tool supper mg member pivotally mounted in said yoke, a cutting tool carried by said member and adjustable angularly, resilient means cooperating with said cutting tool, and adjustable means for varying the tension between the cutting tool and the disk.

9. A sharpening attachment for cisk harrows comprising a yoke provided with. tran verse grooves disposed on opposite sides ct the horizontal center adapt d to slidahly engage a portion of said harrow. a tool sup porting member pivotally mounted in said yoke, a sharpening tool carried by said m mber and adapted for longitudinal and an lar adjustment, and resilient means for cre" ing tension between the cutting tool and the disk.

10. A sh arpening attachment for disk harrows comprising a yoke provided with oppositely disposed grooves extending angula ly with respect to the horizontal center thereof, adapted to slidably engage a portion of said barrow, a tool supporting member pivoted within said yoke, a sharpening tool longitudinally mounted in said member, means for angularly adjusting the sharpening tool, and an adjustable tension means secured to the tool supporting member and engaging said yoke for varying the tension between the sharpening tool and the disk.

11. A sharpening attachment for disk harrows comprising a guide bar, adjustable means secured to the guide bar and to a portion between the disks for positioning the guide bar with respect to the periphery of the disks, adjustable means attached to the first mentioned means and to a portion of the harrow for supporting the guide bar, a supporting member slidab-ly mounted on the guide bar, a tool holder in the form of a bell crank pivoted at its central portion to the supporting member, a recess formed in one arm of the tool holder, a cutting tool longi tudinally mounted in said recess, said tool being secured in position by means of an eye bolt through which the cutting tool extends,

, the body of the bolt being mounted for angular adjustment in the arm and means attached to the opposite arm of the bell crank adapted to engage a portion of the supporting member for adjusting the tension, between the cutter and the disk.

12. A sharpening device for disk harrows comprising a. guide bar adapted to be attached to said harro-w, a yoke provided with oppositely disposed grooves suspended from said guide bar depending upon the direction in which the convex surface of the disks extend, means for locking the yoke to the guide bar, a tool holder pivotally mounted in said yoke provided with a longitudinal groove adapted to receive and support a. cutting tool, a cutting tool positioned in said slotand extending through an opening in an eye bolt, the opening substantially conforming to the cross section of the cutter, and the body of the eye bolt extending through an opening transversely of said groove, and adapted for angular adjustment, and means attached to the opposite portion of the tool holder engaging a portion of the yoke, said means being provided with a resilient member for regulating the tension between the cutter and the disk. V

In testimony whereof, I hereunto aifix my signature.

FRANCIS M. CASE.

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