Abstract:
An agricultural tillage implement has a main frame with a plurality of ground support wheels, and a finishing attachment arranged behind a group of primary seedbed preparation tools. The finishing attachment includes a reel assembly having an over-frame tube to which reel standards are attached, and reel arms that connect the over-frame tube to the implement frame. The reel arms are attached to the over-frame tube by a flex pivoting connection that allows at least one degree of freedom movement when the reel encounters an obstruction. The reel assembly includes a rolling reel basket having slats made from half-round material. The slats are oriented with leading edges that provide clod breakage and residue pinning action during their descent, and rounded surfaces for firming soil at their lowest quadrant position. A push configuration treader assembly with multiple operation modes can be mounted compactly close to and ahead of the reel assembly.

Description:
RELATED APPLICATIONS 
       [0001]    This application claims priority of U.S. Provisional Application No. 62/134,535 filed on Mar. 17, 2015. The content of this prior application is incorporated herein by reference. 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present invention relates generally to tillage equipment, primarily used for soil cultivation, residue management and seedbed preparation. 
         [0004]    2. Description of Related Art 
         [0005]    In the past 15 years a new class of tillage tools has evolved that has been classified and marketed as “vertical tillage tools.” Although many different forms of “vertical tillage” tools are in use and are being developed, the most common and most widely used are the tillage tools with two primary gangs of rotatable soil engagement tools that follow each other along a same line of travel, with some form of trailing attachment to provide secondary tillage, field leveling, chemical incorporation, clod sizing and seedbed firming. 
         [0006]    Most of these “vertical tillage” tools use gangs of straight coulters or shallow concavity disc blades spaced 7-10″ apart running at gang angles generally below 5 degrees, to perform residue management and to create no-till and min-till seedbeds. The unworked soil left between the primary gang blades is usually tilled by a treader or rolling harrow attachment running behind the two primary gangs. This attachment works best if it selectively targets the unworked soil strips between the blades by its lateral spacing and positioning of the attachment relative to the primary gangs. This prevents overworking areas that the primary gangs have already tilled and generates a more uniform tillage pattern and more consistent working depth across the machine. Treader attachments that selectively target the un-tilled soil is found in the prior art. The prior art treader gangs are pull-type trailing, spring or hydraulic down pressure induced, with high pivot points and steep standard angles to minimize front to rear implement distance and reduce negative tongue weight. Trailing, spring-biased treader or rolling harrow gangs are susceptible to damage when operated in a reverse direction of travel. Because these tools run in wet and adverse conditions, gang lodging and mud buildup in gangs around mud scrapers is common. The easiest clean out process for a lodged gang is to reverse the machine travel direction and slowly lower the machine to the ground to reverse the gang rotation direction in order to dislodge the mud and residue buildup from the gangs. This may cause component damage or breakage to the trailing treader/rolling harrow gangs or components from gangs wanting to buckle under. 
         [0007]    Most related art “vertical tillage” tools have a rolling finishing reel attachment mounted independently behind the treader/rolling harrow attachment to smooth and firm the seedbed surface. The finish reel normally has spring-biased down pressure with some manufacturers having a float setting for wet conditions. Some related art reel attachments have adjustable down pressure also. Most manufacturers offer finishing reel designs with flat-bar or round-rod slats. The flat-bar slats are marketed as having better clod breakage action and better residue pinning action over the round-bar slat. The round-bar slat is marketed as having better firming action over flat bar slats. Manufacturers offer both types, but owners have to choose one over the other at the time of purchase. 
         [0008]    Some manufacturers are starting to offer a heavier “soil conditioning” reel attachment in the  14 ″+diameter range instead of the more common 11-13″ diameter “finishing reel” attachment. These “conditioning reels” break dry clods better and make leveler, firmer seedbeds. The extra weight and down pressure of the heavier reels induce greater bolt connection loads when tripping over one-sided obstructions. Manufacturers have had to increase bolt strength and bolt numbers at the reel over-frame tube connection to prevent bolt failures. This solution does not address the overloading of the reel bearings due to the lack of reel gang flexibility. 
         [0009]    There is a need in the industry for a better, more compact, more versatile treader-reel attachment configuration that does not incur damage from repeated reverse travel directions and provides additional benefits and tillage options not previously available. 
       SUMMARY OF THE INVENTION 
       [0010]    A vertical tillage tool as described above is used to do light min-till tillage, no-till residue management and seedbed preparation. The tool is used in all seasons in a wide variety of field and residue conditions. 
         [0011]    A common rear attachment found on seedbed preparation tillage tools is the finishing reel, whose purpose is to break up and resize clods, tuck and anchor residue, and firm and level the seedbed surface. Due to the wide variety of field conditions and soil types, it has become common in the industry to provide either a “flat bar” or a “round rod” slatted reel option, at the time of purchase, where you are allowed to only choose one type. The flat bar reel slat is typically made of ¼″×1¼″ flat bar material, bent into a helical shape and welded into the reel support plates. This “flat bar” slat configuration provides good clod breakage with adequate residue pinning and some soil firming. Alternatively, a “round rod” slat, typically ¾″ or ⅞″ diameter, reel may be chosen which provides lesser clod breakage action, very minimal residue pinning but better ground firming action than flat bar slats due to the larger soil contact area. A feature of the present invention provides a new reel design that is made from “half-round” stock material that provides better clod breakage and residue tucking action than the flat bar slat and better soil firming action than the round bar slat reel all in one design. The “half-round” slats are positioned in the reel support plates in a manner to allow the sharp edge of the slat material to engage residue and clods on its leading edge decent motion, thus providing a cutting/pinning action to the clods and residue. As the slat rotation is progressed to the lowest possible position, the rounded part of the “half-round” material is then in full contact with the soil when the weight/down pressure of the reel assembly is at its greatest, thus providing an equivalent soil firming action as a round rod slat. 
         [0012]    Finishing reel/soil conditioning attachments that provide higher levels of down pressure action have experienced increased bolt stresses and bolt failure rates in the bolted connection between the reel arm and the reel over frame tube. This is primarily due to the binding action placed on the connection bolts when the reel encounters a one-sided field obstruction or mounded soil structure that lifts one side up while the down pressure spring on the other side prevents its side from also moving up. The common solution has been to increase the size, number and strength of the connection bolts to prevent breakage. This may cause reel arm pivot pin binding and excessive bearing and component loads when a one-sided obstruction occurs. A flexible connection between the reel arm and the reel over frame tube is needed to allow the reel to freely flex over obstacles without creating excessive loading of components. A feature of the present invention provides a reel arm to over frame connection design that occupies a very narrow amount of over frame tube yet allows two degrees of flex freedom when encountering one-sided obstacles. The narrow design is beneficial when used in conjunction with another invention feature, where treader mounting brackets are attached to the same over frame tube. The third degree of freedom movement is held rigid, namely, twist along the axis of the over frame tube, to prevent the reel from pivoting forward or backward which is in the same direction as its normal field loading to provide stable operation. 
         [0013]    In a no-till, “true vertical” minimal soil disturbance farming operation, the primary tillage tools are arranged to provide the absolute minimal amount of lateral soil disturbance in order to maintain the present soil integrity and soil structure. With gang angles set to very low values, full soil cutout is not possible and un-touched residue and soil is left in-between the tillage paths of the primary tillage tools. It is common in the industry, with this type of tillage operation, to use a rear attachment for the purpose of tilling the soil and residue left between the primary tillage blade paths. Selective targeting of the un-tilled soil bands by lateral spacing and placement of treader soil engagement teeth, provides a fairly consistent tillage operation across the full width of the tillage tool without over working the areas where the primary tools have already ran. A trailing, spring biased, rolling treader gang set at a slight angle perpendicular to the line of travel, has been used successfully in the industry to achieve this tillage objective. As mentioned before, some not-so-obvious problems are inherent in the prior art trailing treader configuration. The steep angle of the trailing treader standards, with their high pivot points make them very susceptible to damage if the implement is backed up with the tillage tools on the ground. 
         [0014]    To avoid the backup damage problems associated with trailing-type treader gangs, and to provide greater treader/reel combination versatility, a push configuration treader is featured in the present invention that has benefits and features over a trailing configuration. No treader damage will occur when backing up with tillage tools lowered to the ground. The treader and reel arrangement is more compact front to back due to treader gang trip being near vertical. The treader generates its own dynamic, draft induced down pressure because of its push configuration. Active spring load requirement is lower than a trailing configuration due to self-induced down pressure, resulting in quick trip intervals and better rock protection. A treader float mode is feasible with a push configuration due to the draft-induced down pressure. This float mode can significantly reduce treader damage and tooth breakage in rocky conditions and can prevent treader mud buildup in wet conditions. A pin-up mode allows the treader to run completely off the ground when field conditions are very wet or to gain extra firming action to the reel, such as in seedbed preparation. 
         [0015]    A unique skim mode allows residue tucking, clod sizing and field leveling with minimal bearing loading while adding some of its weight to the finishing reel. Finishing reel can then be operated in float mode with the extra weight of the treader in skim or pin up mode. Treader pivot points use ball joint connections to prevent pin binding during one-sided trip conditions. Quick disconnect arms allow treader gangs to be removed fast and easily to lighten the implement for spring time dry-out operations. Another benefit is that an “after-the-sale” treader purchase can be added to the implement with minimal changes to the existing reel setup. Conventional/min-till farmers will want the reel only setup but not likely need a treader attachment. If the machine is later sold to a no-till farmer, the treader gang can be easily added to the existing reel setup with minimal changes. 
         [0016]    Numerous other objects of the present invention will be apparent to those skilled in this art from the following description wherein there is shown and described exemplary embodiments of the present invention. As will be realized, the invention is capable of other different embodiments, and its several details are capable of modification in various obvious aspects without departing from the invention. Accordingly, the drawings and description should be regarded as illustrative in nature and not restrictive. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0017]      FIG. 1  is a perspective side view of a shallow working tillage tool with a reel-only finishing reel attachment operating in a min-till configuration. 
           [0018]      FIG. 2  is a perspective side view of a shallow working tillage tool with a treader and finishing reel attachment operating in a no-till configuration. 
           [0019]      FIG. 3  is a partial orthographic side view of the reel-only finishing attachment with half-round slat basket assembly, featuring a flexible bolt connection between the reel arm and reel over frame tube. 
           [0020]      FIG. 4  is a partial section side view of the of the reel basket weldment assembly with half round slats  77 S contacting the surface clod  18 C and slat  77 S contacting the ground at lowest quadrant position  77 Q. 
           [0021]      FIG. 5  is partial perspective front view of the reel-only finishing attachment encountering a one-sided field obstruction showing reel assembly flex connection trip arrangement. 
           [0022]      FIG. 6  is a partial perspective top rear view of the treader and finish reel attachment with narrow over frame tube flex connections and lateral adjustable treader mounting brackets  81 S and  81 L attached to reel over frame tube  76 . 
           [0023]      FIG. 7  is a partial side view of the treader and finish reel attachment showing treader gang positioning relative to finish reel, with treader gang in active spring mode. 
           [0024]      FIG. 8  is a perspective exploded view of the treader and finishing reel attachment with flexible reel over frame tube bolt connections. 
           [0025]      FIG. 9  is a partial orthographic side view of the four different treader operation modes with the various operating mode pin settings shown. 
           [0026]      FIG. 10  is a partial perspective view of an enhanced flex connection between the reel arm  71  and the reel over frame tube  76  using a rubber spacer plate  73 R to provide an additional joint flex degree of freedom. 
           [0027]      FIG. 11  is a partial comparison side view between the two types of prior art rolling reels, namely round rod and flat bar, and the rolling reel of the present invention, showing the rotational engagement with a field surface clod  18 C and the soil contact area of each type of rolling reel. 
           [0028]      FIG. 12  is a partial comparison side view between the half-round rolling reel slat  77 S and an equivalent weighted round rod slat RR, where the cross section area of both slat types are equal, thus being equally weighted, and showing the difference in radial geometry in contact with the soil area at the reel&#39;s lowest quadrant position  77 Q for the slat angle of B. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0029]    An agricultural implement according to the present invention will now be described in detail with reference to  FIGS. 1 to 12  of the accompanying drawings. 
         [0030]    A shallow working tillage implement  10  according to the present invention is shown in  FIGS. 1 and 2 . The implement  10  is connected to a towing vehicle  17  by a hitch assembly  16 . The implement  10  is a three section configuration with a center section  21  and lateral wings sections  25  on each side. Each section has a main frame  21 F and  25 F to which tillage tools  12  and  13  and wheel assemblies  14  and  15  are attached. At the trailing edge of the main frames  21 F and  25 F, a finishing attachment  60  and  65  is mounted to level, smooth, firm and condition the soil and residue for the next farming operation. 
         [0031]    The implement in  FIG. 1  is a “min-till” shallow working tillage tool having two gangs of rotatable tillage tools,  12  and  13 , that follow each other along a line of travel where the lateral soil displaced by the front gangs is laterally returned by the rear gangs. The gang angles are set to approximately 12 degrees from a line perpendicular to the line of travel, and the gang blade spacing is approximately 7.5″. In this “min-till” configuration, with a ground speed of 7-8 mph, the implement will provide a full soil cutout operation in favorable conditions. A reel-only attachment  60 , is shown trailing behind the two primary tillage gangs  12  and  13 . With adequate gang angle and soil cutout, the reel-only attachment  60  is a preferred attachment. 
         [0032]    The implement in  FIG. 2  can be classified more as a “no-till true-vertical” shallow working tillage tool having two gangs of rotatable tillage tools,  12  and  13 , which follow each other along a line of travel. The gang angles are set to a very low angle, less than 4 degrees from a line perpendicular to the line of travel, and the gang blade spacing is approximately 7.5″. In this “no-till nearly true-vertical” configuration, even with ground speeds greater than 8 mph, the implement will not provide full soil cutout operation. A reel and treader attachment  65 , is shown trailing behind the two primary tillage gangs  12  and  13 . The treader gang is needed to till and manage residue left un-touched between the two primary tillage gangs. To minimize front to back implement distance and to make the attachments work on multiple types of machines, a compact, versatile, universal mounted, reel and treader system is needed. The present invention provides these benefits along with extra flexibility and modes of operations not found on prior art finishing attachments. 
         [0033]      FIG. 3  shows a partial view of the reel-only min-till attachment. The rear attachment mounting head  70  is secured to the trailing edge of the main frames  21 F and  25 F as shown in  FIGS. 1 and 2 . The reel arm  71  is pivotally attached to the mounting head  70  at the reel arm pivot  71 P. A down pressure spring assembly  72  provides varying working down pressure to the rolling reel basket  77  through the setting of the adjustments positions  71 A and the reel spring release pin  72 P. A reel arm stop  71 S is engaged when the machine is in its raised lift position. 
         [0034]      FIG. 4  shows a partial section view of the rolling reel basket  77  encountering a field surface clod  18 C during its leading edge decent and forward travel rotation  77 R. The half-round slat  77 S has a flat side, a rounded side, and an edge between the flat and rounded sides. The half-round slat  77 S has the shape of a truncated cylinder cut along a plane parallel to a longitudinal axis of the cylinder. The slat  77 S is oriented so that the edge between the flat and rounded sides is a leading edge relative to a direction of rotation during operation. The half-round slat  77 S is angularly arranged, by angle β in  FIG. 11 , within the basket assembly  77 , to best penetrate clods and residue during the leading edge decent and forward rotation  77 R. The half-round slat  77 S is also shown at its lowest quadrant position  77 Q. The slat  77 S is oriented in this position to provide a soil firming action with its rounded curved surface against the soil surface as shown. 
         [0035]      FIG. 5  shows a partial perspective view of the reel-only finishing attachment  60  shown on the implement  10  in  FIG. 1 . The finishing reel attachment  60  is shown encountering a one-sided field obstruction  18 . A feature of the present invention is a narrow flexible connection between the reel arms  71  and the reel over-frame tube  76 . A reel arm pivoting bolt arrangement  71 B, with a 4-hole clamp plate  73 P allows the flex connection one-degree of freedom movement when encountering an obstruction as shown. The clamp plate assembly  73  and  73 P, shown in  FIG. 8 , maintains a rigid connection to the reel over frame tube  76  without slippage during flexing. 
         [0036]    Another feature of the present invention is a push-configuration treader and reel attachment  80  as shown in  FIGS. 6 and 7 . The narrow flex pivoting connection arrangement between the rolling reel attachment arms  71  and the reel over-frame tube  76  provides optimum lateral arrangements of the treader gangs and allow both the rolling reel baskets  77  and the push configuration treader gangs  84  to flex more easily over one-sided obstructions. This prevents rigid connection assembly bolt breakage and reel arm pivot pin  71 P binding problems that are increased by the extra weight of the combination treader and reel assembly. The treader gangs attach to the reel over-frame tube  76  to provide a very compact treader and reel arrangement to reduce overall implement length and reduce unsafe tail heavy implement conditions. The treader mounting brackets  81 S and  81 L are made to adjust laterally to selectively target the soil and residue left between the two primary tillage gangs. The treader gangs are mounted at an angle α, relative to the reel over-frame tube  76  by using variable length mounting brackets  81 S and  81 L and arms  82  that can be made in different lengths to accommodate various gang sizes and placements. This angle provides necessary staggering of gangs and to enhance tillage action. An angle of 5 to 10 degrees provides good tillage action and staggering. 
         [0037]      FIG. 7  shows a side view of the push-configuration treader in an active spring mode setting. The treader mode spring lever  86  is held down by the placement of pin  86 P in the active spring setting hole. The compression springs  85  are compressed as the treader gang  84  and treader arms  82  pivot upward at pivot points  82 B. The treader trip action is near vertical due to the low positioning of the pivot point  82 B, at or slightly below the reel over frame tube height, thus making the overall arrangement of the treader and reel assembly very compact front to back which is very beneficial to reducing tail heavy implement situations. The low positioning of the pivot points  82 B also provide self-draft induced dynamic downforce loading of the treader while also providing quick vertical trip and efficient obstacle damage protection. The ball joint connection  82 B also provides multiple degrees of flex freedom during one sided obstacle encounters while providing better soil to treader contact and function with enhanced rock trip protection. This helps prevent pivot pin binding and reduced treader teeth breakage, while allowing the treader gang assembly to flex and work independently of the rolling reel baskets  77  during one-sided field obstructions. 
         [0038]      FIG. 8  shows a perspective exploded view of the treader and reel assembly. The exploded view shows the individual parts of the treader mounts, arms, spring, brackets and level assemblies. A short and long set of treader mounting brackets  81 S and  81 L are shown creating the angle alpha a, for the treader gangs. Treader pivot arms  82  are pivotally connected to the treader mounting brackets  81  with a ball joint connection  82 B. The treader bearing brackets  83  are bolted to the treader gang  84  with the front 3-hole pattern shown. 
         [0039]    Another feature of the present invention is a quick attachment design that allows quick and easy attachment/removal of the treader gang  84  with brackets  83  from the machine when it is not needed, especially in very wet field dry out operations. The quick attach points  82 Q allow positioning aid during the re-attachment process. Also shown in  FIG. 8  are the spring assemblies  85  and mode spring levers  86  that facilitate different mode settings by the placement of spring mode pin  86 P as shown in detail in  FIG. 9 . 
         [0040]    Four different treader modes are shown in the side view of  FIG. 9 , namely, Float  80 F, Active Spring  80 A, Pin Up  80 P, and Skim mode  80 S to allow for different performance characteristics in varying field conditions ranging from wet and soft to hard and dry. With the treader mode pin  86 P placed in the top hole of the treader mounting bracket  81 , the treader is placed in a “float mode”  80 F, where the spring assembly  85  and mode spring lever  86  are not restricted in their upward travel. The float mode arrangement will disable the active down pressure springs and take advantage of the push-configuration self-draft induced down pressure. This provides better treader tooth protection and quicker rock trip performance. With the treader mode pin  86 P placed in the second highest hole, the treader mode is set to an “active spring” mode  80 A. The treader mode spring lever  86  is limited in its upward travel, thus causing spring compression during field working operations. In active spring mode, the treader downforce is a combination of spring pressure and self-draft induced rotation. A lighter spring can be used on a push-configuration treader to achieve the same results as a trailing treader arrangement, which provides better treader tooth protection and quicker rock trip performance. 
         [0041]    The “pin up” mode  80 P is also shown in  FIG. 9 . When the treader action is not needed, the mode pin  86 P can be placed under the mode spring lever  86  and in the third hole down from the top. The treader gang is then held up from the soil surface and deactivated to prevent excessive wear and reduce tractor draft loads. In this mode, the treader gang weight is transferred to the finishing reel for extra firming action and can allow the rolling reel to run in a preferred float mode, by moving spring release pin  72 P from position  70 S to position  70 F, to prevent high trip damage and spring overloading. 
         [0042]    A unique “skim mode”  80 S is another featured treader mode of the present invention. This mode is set by placing the treader mode pin  86 P in the lowest hole on the treader mounting bracket  81  to hold up the treader gangs slightly off the soil surface. The treader gangs will still level ridges and break clods while adding some weight to the finishing reel. The extra weight may allow the finishing reel to be run in a more preferred float mode, by moving spring release pin  72 P from position  70 S to position  70 F, to prevent high trip damage and spring overloading. 
         [0043]    Another feature of the present invention is illustrated in  FIG. 10 , showing a narrow enhanced flex bolt connection between the reel arm  71  and the reel over-frame tube  76 . A second degree of flex freedom movement is accomplished by adding a rubber spacer plate  73 R inside the 4-bolt clamp plate assembly. The clamp plate assembly  73  and  73 P holds the over-frame tube  76  securely in place without slippage. The exploded view shows the full surround enclosure of the over frame tube  76  by the shape of reel arm  71 . The 4-bolt clamp plate assembly, including  73 ,  73 P,  73 R  73 B and  73 N, is captured in the surround enclosure of the reel arm  71 , thus to provide draft load rotational support of the over frame tube  76  (rotation along is own axis), while allowing flex movement in the other two degrees of freedom axis movement. The enclosure can provide friction against the top and bottom of the clamp plates  73  and  73 P, to prevent constant loose rattling and wear while still allowing one-sided obstruction flex movement if needed. 
         [0044]      FIGS. 11 and 12  show the comparison features between the prior art round rod slatted reel RR and the flat bar slatted reel FB with the present invention half-round slatted rolling reel  77 S.  FIG. 12  shows the difference in radial geometry of the two equivalent weighted types of rounded reel slats in contact with the soil area at the reel&#39;s lowest quadrant position  77 Q for the slat angle of B. Both slats have the same cross-section areas, thus having the same linear weight per foot. The half round slat  77 S provides a larger soil to reel slat surface contact area than the equivalent weighted round rod slat can provide. The larger slat surface contact area is beneficial to distribute the extra weight transferred from the treader gangs in pin-up or skim mode. 
         [0045]    The industry has been offering the choice of prior art round-rod or flat-bar rolling reel designs for many years, but owners have to choose which type to buy that is best for their farming practice and their soil and residue conditions. Apparently it hasn&#39;t been obvious to those skilled in the art to use a half round slatted material to accomplish the task of both types of reels in one design. If so, manufactures would be offering a single design that achieves the benefits of both designs with no draw backs. 
         [0046]    While the invention has been specifically described in connection with specific embodiments thereof, it is to be understood that this is by way of illustration and not of limitation, and the scope of the appended claims should be construed as broadly as the prior art will permit. 
       REFERENCE NUMERAL LIST 
       [0047]    The following is a list of reference numerals used in the drawings of this application, along with the name of the labeled part:
   α Treader gang angle   β Reel slat angle   G Ground   RR Prior art round rod slat (equivalent weighted)   FB Prior art flat bar slat     10   FIG. 1  shallow working  3 -section implement with finishing reel-only attachment.     10   FIG. 2  shallow working  3 -section implement with finishing reel &amp; treader attachment.     12  Primary front gang assembly     13  Primary rear gang assembly     14  Main lift &amp; transport assembly wheels     15  Wing lift assembly wheels     16  Hitch assembly     17  Tractor or Towing vehicle     18  Field obstruction     18 C Field surface clod     21  Center frame assembly     21 F Center frame     25  Wing frame assembly     25 F Wing frame     60  Reel-only finishing attachment     65  Reel and treader finishing attachment     70  Rear attachment mounting head     70 F Down pressure spring float position     70 S Down pressure active spring position     71  Reel arm     71 A Reel down pressure adjustment     71 B Reel arm flex pivot bolt     71 P Reel arm pivot     71 S Reel arm stop     72  Reel down pressure spring     72 P Reel spring release pin     73  Reel 4-hole clamp plate     73 B Clamp plate bolt     73 N Clamp plate nut     73 R Rubber spacer plate     73 P Clamp plate pivot     76  Reel over frame tube     77  Rolling reel basket     77 A Reel slat soil contact area at lowest quadrant position     77 Q Reel slat lowest quadrant position     77 R Reel forward rotation     77 S Reel slat     78  Reel standard     80  Treader assembly     80 A Treader Mode Active Spring     80 F Treader Mode Float     80 P Treader Mode Pin up     80 S Treader Mode Skim     81 L Treader mounting bracket long     81 S Treader mounting bracket short     82  Treader pivot arm     82 B Treader pivot ball joint     82 Q Treader quick attach     83  Treader bearing bracket     84  Treader gang     85  Treader Spring assembly     86  Treader mode spring lever     86 P Treader mode pin