US2196713A

US2196713A - Harrow snubber

Info

Publication number: US2196713A
Application number: US186115A
Authority: US
Inventors: Frederick C Warne
Original assignee: FARM TOOLS Inc
Current assignee: FARM TOOLS Inc
Priority date: 1938-01-21
Filing date: 1938-01-21
Publication date: 1940-04-09
Anticipated expiration: 1957-04-09

Description

c. WARNE HARROW SNUBBER Filed Jan. 21, 1939 2 Sheets-Sheet 2 INVENTOR ECW621126 BY I V Q ATTORNEY Patented Apr. 9, 1940 tion PATEN OFFICE HARROW SNUBBER Frederick C.' Warne, Mansfield, Ohio, assignor to Farm Tools,'Inc., Mansfield, Ohio, a, corpora- AppIicatiOnJanuaryZI 1938, Serial No 186,115 20 Claims. (01. s5 s1) This invention relates to improvements in disc harrows and particularly to snubbing means to resist the tendency to upward thrust of the inner ends of two oppositely extending and mutually reacting disc gangs.

The invention is useful in connection with any disc gang of this type'but is of particular importance in connection with wide disc harrows of the sectionalized type as shown for instance in my United Patent No. 2,098,116 and my pe tion for patent Serial No 106,517. In harrows States Letters nding applicaof this type the weight of each section is such that there develops a very marked tendency'to upward thrust of the inner ends of the gangs. Efiorts have been made to overcome this in prior disc harrows by various snubbing sofar as my knowledge goes all heretofore attempted have func means but inof the devices tioned upon a principle which tended 'to bring the inner adjacent ends of the gangs closer tog ether, thus exerting too great an end thrust and binding effect against the bumper washers and bearings.

It is, therefore, the main object of the present invention to provide a snubbing device which will very effectively eliminate the tendency of the inner arms of the gangs to rise but which will at the same time maintain the normal end thrust between the bumper washers and avoid binding at that point.

A further object of the invention is to so design and construct the snubbing device that it will not changes to the harrow as originally constructed.

A further object of the invention is to produce a simple and inexpensive device and yet. one

which will be exceedingly effective for the'p'ur pose for which it is designed.

These objects I accomplish bymeans of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawings similar chara cters of reference indicate corresponding parts in the several views:

Figure 1 is a top plan view of the snubber as applied to the harrow, showing the gangs in parallel position.

Figure 2 is a view similar to Fig gangs in angled position,

. 1 showing the Figure 3 is a'longitudinal or side view of the same partly in section.

Figure 4 is a view similar to Fig. 3 but illustrating a modified form of the invention.

Referring now more particularly to the characters of reference on the drawings, the harrow proper comprises separate harrow gang frames I having cross angle members 2 at their adjacent ends, such ends of the gang being separated somedistance from each other as usual. The 10 discs 3 are mounted in connection with each frame as usual, the adjacent endmost discs hav ing contacting bumper washers 4 as is customary.

The main draft fork 5 of the harrow is separately pivoted in connection with the frames i, 15 in the ordinary manner, the bumpers '4 being curved concentric with the pivots so that the frames can swivel relative to each other while maintaining the bumpers in engagement.

My improved snubberas applied to the above 20 mentioned standard harrow construction, includes a rigid saddle extending between and slidably resting on the cross members 2 and comprising generally a pair of spaced angle bars 8.

A pair of pivotpins 9, one adjacent each end of 25 I the bars 8, and a central pivot pin I0, effectively secure the'spaced bars 8 together as a unit to form a rigid truss'saddle. Levers II project between the saddle bars 8 and are pivoted intermediate their ends on the 30 pins 9. I I A v-shaped rocking bracket l2 at its apex surrounds the pivot pin I!) for free rocking movement thereabout. The adjacent inner ends of the levers II are provided with yokes I3 5 mounted over the arms of the bracket I2 for free sliding movement thereon. The free ends of the arms. lZare threaded asat It to receive adjustment nuts l5 and interposed between each of thesenuts and the corresponding yokes I3 are 1 The opposite ends of the angle irons l8 bear against the under side of the opposite side angles of the gangs I so that theangle irons l8 are free 50 to have a swinging movement underneath the gang frames about the pivots l9,"when the gangs are'angled relative to each other.

From the foregoing description it will be apparent that the saddle 8, bracket 12, arms H and the angle irons l8 form a substantial truss like unit structure between the gang frames when the adjustment nuts l5 are set to put the springs under substantial tension. Since the saddle 8 overlies and rests on the immediate adjacent ends of the gang frames and the levers II are pivoted at the ends of this saddle and to the gang frames at points outwardly of the points at which the saddle rests on the frames, these levers, when stopped at their inner ends against the springs l6, tend to exert a lifting action on the gang frames beyond the points at which the saddle 8 rests on the adjacent inner ends of the gangs. This tendency to a lifting action will therefore very definitely resist and overcome the tendency of the outer ends of the gangs to sag downwardly and impart a consequent upward thrust to the inner ends of the gangs. At the same time, the pivotal mounting of the bracket l2 and such resiliency as may be permitted to the springs IE will allow a flexibility of movement to prevent undue strains being placed on the working parts. The degree of resilient flexibility desired. may be quite easily controlled through the movement of the adjustment nuts I5. If considerable amount of flexibility is desired the nuts will be retracted towards the outer ends of the arms of the brackets l2. Less flexibility can be attained by a reverse action of the nuts which reverse action can be carried to the extreme by taking all the resiliency out of the springs leaving the assembly completely rigid against upward thrust of the ends of the gangs. It will be obvious that there is no resistance to the inner ends of the levers moving in a downward direction so that when the outer end of the harrow strikes obstructions or uneven ground which tends to raise such outer ends, this action may be permitted without possibility of undue strains being placed on the Working parts.

The straight line distance between the pivot pins 9 of the snubber levers is obviously greater than the corresponding distance between the draft fork pivots so that when the harrow frames are angled about said latter pivots the normal distance between the pivots ll of course tends to decrease. This is compensated for by the swinging movement afforded, the angle irons IS on their pivots [9. When the frames are thus positioned at an angle to each other the cross members 2 likewise slide under the saddle 8 and the relative position of the latter is altered as indicated in Fig. 2. but this does not effect the snubbing action of the device as will be evident.

In Fig. 4 there is shown a modified form of support and adjustment of the inner ends of the snubber levers. In this structure the rocking V-shaped bracket l2 and its-associated parts are not used. Instead there is provided a yoke l2a secured to and overhanging the saddle 8a and a pair of set screws a project through this yoke and the inner adjacent ends of the levers Ila project under and bear against these set screws. The set screws act as the stops for the inner ends of the levers Ha by which the lever action is controlled to tend to exert the desired lifting action on the gang frames beyond the point at which the saddle rests on the ends of the gang frames and thus prevent the tendency to upward thrust of the inner ends of the gang frames. The desired position and action of the parts may be controlled by the adjustment of these set screws l5a. The functioning of this modified structure is the same as that of the preferred structure except that it is, not provided with the flexible cushioning effect afforded by the use of the springs Hi.

It will also be quite obvious that while this truss structure very definitely functions to attain the above objectives, there is no tendency at any time during its functioning for the adjacent ends of the gang frames to be moved or pulled toward each other but they will be definitely held substantially in normal spaced relation. This is an important feature of my invention and presents a distinct advantage over previous snubbers in that there is no additional end thrust exerted against the bumper washers 4 and the bearings of the discs.

From the foregoing description it will be readily seen that I have produced such a device as substantially fulfills the objects of the invention as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described my invention, what I claim as new and useful and desire to secure by Letters Patent is:

1'. In a disc harrow the combination with two oppositely extending mutually reacting disc gangs with draft means connected therewith of a truss saddle over-reaching from one gang frame to the other, levers pivoted to the saddle and the gang ends for swinging movement in a vertical plane, and means to resist upward movement of the adjacent ends of the levers.

2. In a disc narrow the combination with two oppositely extending mutually reacting disc gangs with draft means connected therewith of a truss saddle over-reaching from one gang frame to the other, levers pivoted to the saddle and the gang ends for swinging movement in a vertical I plane, means to resist upward movement of the adjacent ends of the levers, such means including a V-shaped bracket mounted on the saddle for rocking movement about its apex, the levers having yokes slidable over the bracket arms, and means to limit such movement in an upward direction.

3. In a disc narrow the combination with two oppositely extending mutually reacting disc gangs with draft means connected therewith of a truss saddle over-reaching from one gang frame to the other, levers pivoted to the saddle and the gang ends for swinging movement in a vertical plane, means to resist upward movement of the adjacent ends of the levers, such means including a V-shaped bracket mounted on the saddle for rocking movement about its apex, the levers having yokes slidable over the bracket arms, and means to limit such movement in an upward direction, such latter means comprising stops on the ends of the bracket arms and yielding elements interposed between the stops and the lever ends.

4. In a disc harrow the combination with two oppositely extending mutually reacting disc gangs with draft means connected therewith of a truss saddle over-reaching from one gang frame to the other, levers pivoted to the saddle and the gang ends for swinging movement in a vertical plane, means to resist upward movement of the adjacent ends of the levers, such means including a V-shaped bracket mounted on the saddle for rocking movement about its apex, the levers having yokes slidable over the bracket arms, and.

means to limit such movement in an upward direction, such latter means comprising adjustable stops on the ends of the bracket arms and yielding elements interposed between the stops and the lever ends. I

5. In a disc harrow the combination with two oppositely extending mutually reacting disc gangs with draft means connected therewith of a truss saddle over-reaching from one gang frame to the other, levers pivoted to the saddle and the gang ends for swinging movement in a vertical plane, means to resist upward movement of the adjacent ends of the levers, such means including a V-shaped bracket mounted on the saddle for rocking movement about its apex, the levers having yokes slidable over the bracket arms, and means to limit sucnmovement in an upward direction, such latter means comprising threaded ends on the bracket arms, nuts mounted for movement on the threads and springs interposed between the nuts and lever ends.

6. In a disc harrow the combination with two oppositely extending mutually reacting disc gangs with draft means connected therewith of a truss saddle over-reaching from one gang frame to the other, levers pivoted to the saddle and. the gang ends for swinging movement in a vertical plane, means to resist upward movement of the adjacent ends of the levers, and means to compensate for the tendency to relatively change the position between the gang ends and levers when the gangs are angled relative to each other.

7. In a disc harrow the combination with two oppositely extending mutually reacting disc gangs with draft means connected therewith of a truss saddle over-reaching from one gang frame to the other, levers pivoted to the saddle and the gang ends for swinging movement in a vertical plane, means to resist upward movement of the adjacent ends of the levers, and means to compensate for the tendency to relatively change the position between the gang ends and levers when the gangs are angled relative to each other, such means including supports pivoted for swinging movement on adjacent gang ends, the outer ends of the levers being pivoted to the supports.

8. In a disc harrow the combination with two oppositely extending mutually reacting disc gangs with draft means connected therewith of a truss saddle over-reaching from one gang frame to the other, levers pivoted to the saddle and the gang ends for swinging movement in a vertical plane, means to resist upward movement of the adjacent ends of the levers, and supports pivoted for swinging movement on adjacent gang ends, the outer ends of such levers being pivoted to such supports.

9. In a disc harrow the combination with two oppositely extending mutually reacting disc gangs with draft means connected therewith of a truss saddle over-reaching from one gang frame to the other, levers pivoted tothe saddle and the gang ends for swinging movement in a vertical plane, and means to resist upward movement of the adjacent ends of the levers, such means including stops mounted on the saddle against which the adjacent ends of the levers impinge.

10. In a disc harrow the combination with two oppositely extending mutually reacting disc gangs with draft means connected therewith of a truss saddle over-reaching from one gang frame to the other, levers pivoted to the saddle and'the gang ends for swinging movement in a vertical plane, and means to resist upward movement of the adjacent ends of the levers, such means including adjustable stops mounted on the saddle against which the adjacent ends of the levers impinge. I I

11. In a discharrow'the combination with two oppositely extending mutually reacting disc gangs with draft means connected therewith of a truss saddle over-reaching from one gang frame to the other, and resting on the adjacent ends of the gang frames, levers pivoted on the saddle and projecting beyond the opposite ends thereof,

and means securing the outer ends of the levers to the gang frames beyond the point at which the saddle rests on such frames.

13. In a disc harrow the combination with two oppositely extending mutually reacting'disc gangs with draft means connected therewith of a truss saddle over-reaching from one gang frame to the other and resting on the adjacent ends of the gang frames, levers pivoted on the saddle and projecting beyond the opposite ends thereof, means securing the outer ends of the levers to the gang frames beyond the point at which the saddle rests on such frames, and meansbetween the levers and saddle to adjust the leversvertically relative to the saddle.

14. In a disc harrow the combination with two oppositely extending mutually reacting disc gangs with draft means connected therewith of a truss saddle, over-reaching from one gang frame to the other and resting on the adjacent ends of the gang frames, levers pivoted on the saddle and projecting beyond the opposite ends thereof,

means securing the outer ends of the levers to I the gang frames beyond the point at which. the

saddle rests on such frames, and means between the levers and saddle to adjust the levers vertically relative to the saddle, such means comprising vertically adjustable set screws carried by the saddle and engaging the inner ends of the levers to raise the outer ends of the levers with V an advancing movement of the set screws.

15. In a disc harrow the combination with oppositely extending mutually reacting disc gangs which comp-rise gang frames, bumper washers on the adjacent ends of the gangs and draft means, of a truss saddle over-reaching from one gang frame to the other and supported thereon and the bumper washers.

16. In a disc harrow the combination with oppositely extending mutually reacting disc gangs which comprise gang frames, bumper washers on the adjacent ends of the gangs and draft means,

- embodying means to reduce end thrust between of a snubber'over-reaching from one gang frame to the otherv and embodying means to reduce end thrust between the adjacent inner ends of the gang frames and the bumper washers.

17. In a disc harrow, the combination with oplowering action on the frames at said ends.

19. In a disc harrow, the combination with oppositely extending mutually reacting disc gangs which comprise gang frames and draft means applied thereto, of a truss structure extending between and engaging the frames at a point on each frame adjacent its inner end; each frame being capable of rocking movement in a vertical plane about said point; said structure embodying means to exert a lifting action on the frames at points beyond said rocking points in a direction away from the adjacent end of the gang frames.

20. In a disc harrow, the combination with oppositely extending mutually reacting disc gangs which comprise gang frames and draft means applied thereto of a truss structure connecting the gang frames and comprising a saddle extending between and resting and slidable on said frames at their adjacent ends and levers projecting in opposite directions from the saddle and held against unrestrained movement at their adjacent ends and means pivoting the levers at their outer ends on the frames beyond said adjacent ends thereof.

FREDERICK C. WARNE.