• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    implement conveyor with steerable tracks. an agricultural implement is presented having a steering mechanism comprising an external coupling, a main carriage connected to the external coupling by a first articulated connection, a steering system arranged in the main carriage and a set of endless caterpillars connected to the main carriage by a second articulated connection and in the steering system by a third articulated connection. the hinged connections allow the caterpillars to be actively directed and remain parallel to the surface on which the implement travels.
    公开号:BR102014002355B1
    申请号:R102014002355-0
    申请日:2014-01-30
    公开日:2020-03-10
    发明作者:Michael J. Connors；Marvin Prickel
    申请人:Cnh Industrial America Llc；
    IPC主号:
    专利说明:

    “IMPLEMENTED CONVEYOR WITH DIRECTIBLE Caterpillars” Precedents of the invention [001] The present invention relates, in general, to agricultural equipment and, more particularly, to an implement having a steerable main conveyor that is towed by a tractor or another suitable vehicle.
    [002] The sizes of current seeders continue to increase with the width of the work, from the increase in the number of row units being requested by consumers, to increases in product containers on board, in order to be more productive. In addition, tractors with more horsepower are being used to tow the implement, which results in heavy frame structures. All of these factors make a significant contribution to the greater weight on the implement.
    [003] For example, prior art implements have a main conveyor that can be equipped with four (4) high flotation tires. This conveyor serves multiple functions. First, it carries the most highly loaded part of the implement's weight, that is, the external hitch, product containers and internal connection points with the wing lances. Second, it serves as the lifting mechanism responsible for raising and lowering the seeder to the appropriate heights for field operation and road transport. Finally, it can be equipped with a steering system that allows for greater maneuverability of the machine when retracted to the transport position. Currently, the tires used in implements of this type are able to support the weight of the implement, in order to allow the implement to be used and transported effectively.
    [004] Also, as the implements become longer, the ability to maneuver on the road becomes critical, thus the need for steering. In addition, the rate of adoption of the vehicle guidance system has become very high. Consumers are requesting the ability to also control the position of the implement while carrying out work in the field.
    [005] Since planting is a time-sensitive operation, consumers do not always wait until the field conditions are ideal for the operation of the implement. As a result, although the implement wheels are able to adequately support the weight of the implement on a dry surface, on a wet surface, the weight of the implement combined with the soil conditions leads to the sinking of the implement wheels in soft damp soils or soils. loose and finally stopping the planting operation, as the unit is “stuck”. Consumers are lobbying manufacturers for implements with the ability to fluctuate on such surfaces.
    [006] To address the issue, prior art devices have been developed that replace the wheels with endless tracks. These types of caterpillars provide greater support for the implement in wet or loose soils, thus decreasing the likelihood of the implement jamming.
    [007] However, when endless caterpillars are used in an implement, the connections between the caterpillars and the implement frame limit the ability of the implement to be driven in field and transport modes. This is due to the fact that the caterpillars are separated from the ground during operation in any of the field or transport modes, as well as during the transition between field and transport modes.
    [008] As a result, it is desirable to develop an implement that uses an endless caterpillar driving system that overcomes the problems with prior art tracked implements.
    Summary of the invention [009] The present disclosure is directed to an endless track system for an implement that can be towed. The implement includes several articulated connections that enable the caterpillars to be actively directed and remain parallel to the surface on which the implement travels. These hinged connections include a first connection between the main conveyor and the external hitch, a second connection between the main conveyor / steering structure and the external hitch, a third connection between the steering structure and the track system and a fourth connection between the driving caterpillars and the main conveyor.
    [010] According to one aspect of the invention, these articulated connections between the crawler system and the external hitch allow better harvesting yields due to the reduction in soil compaction by the implement using the crawler system of the present disclosure.
    [011] In accordance with another aspect of the present invention, the crawler system of the present disclosure features modes for the orientation of the implement in the field or steering capability.
    [012] In accordance with yet another aspect of the present invention, the track system of the present disclosure reduces the need for maintenance due to crop stubble and road hazards as a result of the structure of the endless tracks.
    [013] In addition to an additional aspect of the present disclosure, the crawler system of the present disclosure has an improved implement and machine stability due to the use of endless caterpillars in the implement.
    [014] In accordance with yet another aspect of the present invention, the crawler system of the present disclosure has the potential to reduce the horsepower requirements of the trailer vehicle on soft / loose soils as a result of increased traction and reduced sinking. worm caterpillar in these types of soil.
    [015] In addition to an additional aspect of the present disclosure, the crawler system of the present disclosure can increase productivity by reducing the time required to drive the implement across roads and through field entrances.
    [016] Other objectives, characteristics, aspects and advantages of the invention will become evident to those skilled in the art from the following detailed description and accompanying drawings. It should be understood, however, that the detailed description and specific examples, while indicating preferred embodiments of the present invention, are provided by way of illustration and not by way of limitation. Many changes and modifications can be made within the scope of the present invention without departing from its spirit and the invention includes all such modifications.
    Brief description of the figures [017] Preferred exemplary embodiments of the invention are illustrated in the accompanying drawings, in which similar reference numerals represent similar parts throughout.
    [018] In the drawings: Figure 1 is a rear isometric view of a seeder having a motive track system according to an aspect of the disclosure. Figure 2 is a partial front isometric view of the seeder shown in figure 1, Figure 3 is a partially cut top plan view of the seeder in figure 1 in a position of the transport direction, figure 4 is a top plan view partially cut out of a main conveyor in figure 3 in a position of transport direction, figure 5 is a top plan view partially cut of a main conveyor of figure 3 in a directional position in the field, figure 6 is an isometric view of the main conveyor of figure 4 in an elevated transport position, figure 7 is an isometric view of a joint of the main conveyor of figure 6, figure 8 is an isometric view of a conveyor of the main conveyor of figure 6, figure 9 is an isometric view view of a front support of the main conveyor in figure 6, figure 10 is an isometric view of a rear support of the main conveyor in figure 6, figure 11 is a partial interior side projection view of the main conveyor in figure 6, figure 12 is a sectional view along line 12-12 of figure 11, figure 13 is a sectional view along line 13-13 of figure 11, figure 14 is a partial frontal view of the main conveyor of the figure 6 and figure 15 is a sectional view along line 15-15 of figure 14.
    Detailed description of the invention [019] With reference now to the drawings, and more particularly to figure 1, an agricultural working system 10 is shown that includes an agricultural working vehicle, such as a tractor (not shown) that tows and optionally supplies the operating force for agricultural implement 14, which is represented as a multi-row front-fold seed, but can be any suitable implement. Seeder 14 may include a toolbar 16 with sets of left and right markers 18, 20 which are attached to the left and right ends 22, 24 of toolbar 16, respectively. The supports 25 can support the marker sets 18, 20 when in a folded position.
    [020] Seeder 14 can include other elements, such as drawbar 26 for connection to the tractor, large seed feeders 28, 29 that provide the seeds for row or seed units 30 and platform set and gate 32 to access and filling the large seed feeders 28, 29. Row or planting units 30 may include a variety of elements for distributing seed, fertilizer, pesticide, herbicide and other agricultural materials. Such elements may include, but are not limited to, a grooving apparatus, adjusting wheels, a pair of spaced or staggered side grooving discs, or alternatively, and without impairing or departing from the spirit and scope of this invention, a type of channel opener to produce a groove in the soil; a pair of discs for furrow finishing, a seed meter, a pressure wheel arranged in longitudinal relation to each other and a feeder for agricultural chemicals. Additionally, seeder 14 can have planting units 30 with individual seed boxes in addition to the large seed feeders 28, 29.
    [021] As mentioned above, seeder 14 has a pair of bulk filler feeders 28, 29. The bulk filler feeder 28 holds the seed for the seed units 30 mounted on the left wing of the frame 16 and the bulk filler feeder 29 keeps the seed for the seed units 30 mounted on the right wing of the frame 16. As shown in figure 2, the seed units 30 are coupled with flow in their bulk filler feeder by hoses of supply (not shown). The seed is measured from the bulk filling feeder 28 to the hoses by a seed measuring set (not shown), as known in the art. Each seed unit 30 has a mini seed feeder 38 and the seed is delivered from the bulk filling feeder to the individual seed boxes 38.
    [022] Now looking at figures 2 to 5, the seeder 14 includes an external coupling 40 to which the drawbar 26 is attached and which supports the bulk filling feeders 28, 29, as well as the platform assembly and gate 32 Below feeders 28, 29, the outer hitch 40 is secured to a main conveyor 42. The main conveyor 42 includes a pair of worm track assemblies 44 connected on opposite sides of the main conveyor 42. The track sets 44 are also operatively connected in a steering system 46 which is partly arranged on the main conveyor 42 and which is operatively connected to the tractor in a known manner, such as by a suitable hydraulic power starting element and / or electronic control system which can be wired or wirelessly (not shown) in order to operate steering system 46 to drive track sets 44 and enable the tractor operator to control steering of travel of the sets of caterpillars 44 and, consequently, the seeder 14.
    [023] The connection of the track sets 44 in the main conveyor 42 and in the steering system 46, as well as the connection of the steering system 46 in the main conveyor 42 and the connection of the main conveyor 42 in the external coupling 40 provide the implement 14 with the ability to drive track sets 44 in both road and field operational modes of transport for implement 14. Additionally, these connections provide implement 14 with the ability to keep track sets 44 following the soil contour by the whole range of movement of the main conveyor 42.
    [024] Now looking at figures 6 to 13, the main conveyor 42 is shown without the external coupling 40 and in an elevated transport position. The main conveyor 42 includes a conveyor 70 (figure 8) having a central portion 72 with a pivot sleeve 74 positioned at its front end 75 and a pair of angled arms extending outwards 76 on opposite sides of the central portion 72. Each arm 76 includes a pair of aligned openings 78 opposite the central portion 72, optionally with a channel 79 extended between them (figure 15) and a flange 80 attached to the arm 76 between the openings 78 and the central portion 72. The central portion 72 it also includes a rear end 82 including aligned slots 84 therein.
    [025] The rear end 82 of the conveyor 70 is attached to a rear support 86, shown in figures 6 and 10, 11 and 13. The rear support is generally of a rectangular configuration with a pair of flanges extending outwards 88 on both the front edge 90 and the rear edge 92 of the rear support 86. Each of the flanges 88 includes a slot 94 in it. The slots 94 on the flanges 88 at the front edge 90 are aligned with the slits 84 at the rear end 82 of the central portion 72 of the conveyor 70 to receive a pivot pin 96 on them which is fixed by retaining rings 97 to pivotly secure the rear support 86 to the conveyor 70.
    [026] The sides of the rear support 86 each include a projection 98 extending out of the rear support 86 and including an opening 100 therein. Each of the projections 98 has a hydraulic cylinder 102 hingedly attached at one end to the projections 98, with the opposite end hinged in an articulated manner to the outer engagement 40. The flanges 88 on the rear edge 92 of the rear support 86 are also hinged on the external coupling 40 similarly to the connection made by pin 96 by a pin 104 positioned within the slots 94 in the flanges 88 and held there by retaining rings 106. The pin 104 is also engaged by articulation with the external coupling 40 in a suitable manner, as as being inserted through the flanges 108 connected to the external coupling 40, as shown in figure 2.
    [027] Now looking at figures 6, 9, 11 and 12, the conveyor 70 is connected opposite the rear support 86 in a front support 110. The front support 110 includes a main body 112 including a pair of front flanges that extend to out 114 at one end and a pair of rear flanges extending out 116 at the opposite end. Each of the flanges 114 and 116 includes slots 118 in them, with the slits 118 in the front flanges 114 positioned in alignment with the pivot sleeve 74 to receive a pivot pin 120 through them which is held in them by retaining rings 122.
    [028] Opposite the pivot pin 120, the rear flanges 116 have a pivot pin 124 inserted through the slots 118 and held in them by retaining rings 126. The pin 124 can be engaged with the external engagement 40 between the flanges 128 (figure 2 ) extending outward from the outer hitch 40 to pivot the front support 110 to the outer hitch 40.
    [029] Now looking at figures 2, 6, 7 and 14, 15, for attaching the caterpillar assemblies 44 to the main conveyor 42, the conveyor 70 includes a pair of joints 130 connected at the ends of the arms 76 opposite the central portion 72. Each hinge 130 includes a main plate 132 with a pair of perpendicular end projections 134 located at opposite ends of the main plate 132. Each hinge 130 also includes a first intermediate projection 136 and a pair of second intermediate projections 138 that extend perpendicular to the plate main 132. The end projections 134 each include an opening 140 therein. The opening 140 in the upper end projection 134 receives a sleeve 142 therein that extends between the end projection 134 and an aligned opening 141 in the first intermediate projection 136. The passage defined by the sleeve 142 is aligned with the opening 140 in the end projection bottom 134, which may also include a similar sleeve 142. Thus, when arm 76 is positioned between the first intermediate projection 136 and the lower end projection 134, openings 78 in arm 76 are positioned in alignment with sleeve 142 to enable that a pivot pin 144 is inserted through it to connect pivot 130 on arm 76. Pin 144 is attached to sleeve 142, such as by a locking pin 145 inserted through sleeve 142 to engage pivot pin 144, but allows arm 76 rotates with respect to pivot pin 144. Pivot pin 144 can also be engaged with one or more wear rings 147 located between the pivot pin 144 / sleeve 142 and the upper end of arm 76 or channel 79 extending through arm 76, as well as between sleeve 142 / pivot pin 144 and the lower end of arm 76 or channel 79 to prevent the movement of the pivot pin 144 compromises the integrity of the material by forming arm 76 and / or channel 79 over time. Wear rings 147 can also be used on all other pivot pins on main conveyor 42 to provide the same function.
    [030] The first intermediate projection 136 also includes a pair of smaller slots 146 in it that are spaced from the opening 141. These slits 146 are used to pivotally connect one end of a hydraulic cylinder 148 to the joint 130 via the first intermediate projection 136. A opposite end of cylinder 148 is pivotally connected in a similar slot 150 on flanges 80 extending out of arms 76.
    [031] The second intermediate projections 138 also include a gap 152 formed in them. These slots 152 are used to jointly connect a tie rod 154 between one of the second intermediate projections 138 arranged on each joint 130 to enable the joints 130 to move together. Additionally, in the illustrated embodiment, the joints 130 and the projections 134, 136 and 138 therein are formed to be symmetrical, such that the joints 130 can be used effectively in any orientation on either side of the main conveyor 42.
    [032] Opposite projections 134, 136 and 138, hinge 130 also includes a sleeve 156 that extends out of the main plate 132 at a location between the upper end projection 134 and the first intermediate projection 136. Sleeve 156 holds an axis 157 on it via a pin 159, the axis 157 extending through the main plate 132 and the sleeve 156 and outward to articulate engagement with the adjacent track set 44. The track 157 is retained in gear with the track set 44 opposite glove 156 by a collar 158 engaged with glove 157 using pin 161 opposite main plate 132, in order to enable the track assembly 44 to rotate around axis 157 between collar 158 and glove 156.
    [033] With this construction for the main conveyor 42, the crawler assemblies 44 can remain parallel to the ground over which the implement 14 travels throughout the movement range of the main conveyor 42. In addition, the steering system 46 can remain stuck on the crawler assemblies 44, as well as on the main conveyor 42.
    [034] In the illustrated modality, this is accomplished using the articulated connections 48, 50, 52 and 54 formed between the various components of the main conveyor 42 and the external coupling 40, the main conveyor 42 and the steering system 46, the steering system direction 46 and the crawler sets 44 and the crawler sets 44 on the main conveyor 42, respectively.
    [035] In the illustrated embodiment, the first articulated connection 48 allows the main conveyor 42 to articulate with respect to the external coupling 40, as best shown in figures 2, 6, 11 and 12 and is the basic reaction joint for all others events that is formed between the main conveyor 42 and the external coupling 40. The first articulated connection 48 is a single pin pivot joint 56 formed by the articulated connection between the front flanges 114 of the front support 110 and the sleeve 74 on the conveyor 70 for the external coupling 40 made by the pivot pin 120 connecting, which is engaged with the external coupling 40 via the flanges 116 (figures 2, 6 and 9).
    [036] The second articulated connection 50 connects the main conveyor 42 and the steering system 46 to the external coupling 40. This second articulated connection 50 ensures that the main carriage 42 and the steering system 46 remain aligned with the track sets 44 and the external hitch 40, allowing the main conveyor 42 to move through the required range of travel between the field (figure 2) and transport (figure 6) modes. As shown in the illustrated embodiment, this second hinged connection 50 is formed by the pivot pin 104 engaged between the flanges 88 on the rear edge 92 of the rear support 86 and the aligned sleeve 108 on the outer engagement 40 and the pivot pin 124 engaged between the rear flanges 116 on the front support 110 and the sleeve 128 on the external coupling 40 to jointly fix the main conveyor 42 on the main frame 40 at a point behind the first articulated connection 48.
    [037] In addition, the second connection 50 is facilitated by connecting one end of each of the hydraulic cylinder 102 to the main carriage 42 in the projections 98. The opposite end of the cylinders 102 is attached in an articulated manner to the external coupling 40 and can be operated to articulate the main carriage 42 with respect to the external hitch 40 between the field and transport positions. These cylinders 102 form an external connection tied directly from the steering assembly 46 with the external coupling 40 which regulates the control angle of the steering assembly 46 based on the relative position between the main conveyor 42 and the external coupling 40.
    [038] The third articulated connection 52 is formed between each end of the steering system 46 and each of the sets of endless caterpillars 44 by the pivot pin 144 connecting the articulation 130 in the arm 76, the articulated connection of the hydraulic cylinder 148 in the articulation 130 and corresponding flanges 80 on the adjacent arm 76 and the connection rod connection 154 between each joint 130 which, in part, form the steering system 46. Additionally, although two cylinders 148 are shown in the illustrated embodiment, one cylinder 148 or one number of cylinders 148 greater than two (2) can also be used in the steering system 46. In this configuration, the third connection 52 allows the track sets 44 to be turned by the track system 46 to rotate the track sets 44 with in relation to the main car 42. This third articulated connection 52 also works to keep the steering system 46 predominantly perpendicular to the trajectory. the ground travel distance of implement 14, while also keeping steering system 46 predominantly perpendicular to external coupling 40. This allows steering system 46 to be operated by an electronic control unit or remote control key (not shown) in tractor that is operatively connected to the cylinders 148 to "turn" the track sets 44, such that the turning motion of the track sets 44 has the track sets 44 rotating parallel to the ground. As a result, the third hinge connection 52 prevents the rotational movement of the track sets 44 imposed by the steering system 46 from causing an angular displacement of the track sets 44, which would result in a direction arc.
    [039] Due to the fact that the crawler sets 44 are placed close to the main carriage 42, the movement range of the crawler sets 44 is controlled via the return of the sensors (not shown) arranged in the various portions of the main carriage 42 and the electronic control module on board in a known manner to avoid contact of the track sets 44 with the main carriage 42. Although the rotation range of track sets 44 in response to the actuation of steering system 46 can be selected as desired, depending on the modality, the steering system 46 would allow a maximum of ± 40, ± 30 or ± 25 degrees of rotation of the sets of tracks 44, among other lanes, in the transport position on the road and would be restricted by the software to a lesser degree of rotation of caterpillar assemblies 44 in field mode or position, such as ± 20, ± 15 or ± 10 degrees of rotation, for example.
    [040] The fourth articulated connection 54 is formed within the track sets 44 or between the sets 44 and the main carriage 42 to provide the independent articulation of each track set 44 in relation to the main carriage 42 to ensure that the track sets 44 follow the contour of the ground on which they travel, optionally independently of each other. Typically, the hinge produced by the fourth hinge connection 54 is mechanically restricted to ensure that the excessive travel of the track assemblies 44 in relation to the main carriage 42 is not found, which could result in vehicle interference. The electronic control module (ECU) and multiple sensors can be used on implement 14 in one or more of the main car 42, the steering system 46 and the endless track sets 44 to provide position feedback, vehicle speed and other sensitive parameters, so that appropriate user control of the steering system 46 can be achieved. This function can also be achieved using mechanical stops (not shown) that restrict the movement path of one or more of the main carriage 42, the track sets 44 and / or the steering system 46 in both directions.
    [041] In the illustrated embodiment, the fourth articulated connection 54 is formed by the axis 157 extending outward from each articulation 130 for articulated engagement with the adjacent track set 44, in order to allow the track set 44 to rotate around the axis 157. In this configuration, each of the track sets 44 can independently conform to the contour of the ground over which the main carriage 42 is traveling without affecting the configuration of the other track set 44.
    [042] The invention has been described with respect to the delivery of seeds for a series of seed units. It is understood, however, that the invention can also be used to deliver other particulate matter, such as granular herbicide, granular fertilizer or other granular chemicals to a series of application units.
    [043] Many changes and modifications could be made to the invention without departing from its spirit. The scope of these changes will become evident from the attached claims.
    权利要求:
    Claims (10)
    [1]
    1. Agricultural implement (14) having a steering mechanism, comprising: a) an external hitch (40) adapted to be operatively connected to a tractor, b) a main car (42) having a conveyor and a rear support (86) hingedly connected thereto, the rear support (86) connected to the external hitch (40) by a first hinged connection (48) such that the main carriage (42) is hinged about a horizontal axis; c) a steering system (46) connected to the conveyor of the main carriage (42) by a second articulated connection (50) such that the steering system (46) is articulated about a vertical axis; CHARACTERIZED by d) at least one set of endless caterpillars (44) connected to the steering system (46) by a third articulated connection (52) configured to keep the steering system (46) perpendicular to the path path of the soil of the implement (14) and generally perpendicular to the external coupling (40), to at least one worm caterpillar (44) articulated around a second vertical axis; and e) a fourth articulated connection (54) articulating the conveyor to at least one set of endless crawlers (44), the fourth articulated connection (54) configured to provide independent articulation of each set of endless worms (44) in relation to the main car (42).
    [2]
    2. Implement (14), according to claim 1, CHARACTERIZED by the fact that the first articulated connection (48) includes at least one hydraulic cylinder (102) operatively connected between the rear support (86) and the external coupling (40) ).
    [3]
    3. Implement (14), according to claim 1, CHARACTERIZED by the fact that at least one set of caterpillars (44) is restricted to a maximum of ± 25 degrees of rotation in an implement transport mode (14) .
    [4]
    4. Implement (14), according to claim 1, CHARACTERIZED by the fact that at least one set of caterpillars (44) is restricted to a maximum of ± 10 degrees of rotation in an implement field mode (14) .
    [5]
    5. Implement (14), according to claim 1, CHARACTERIZED by the fact that the implement (14) includes two sets of endless caterpillars (44) and each set is connected to the conveyor of the main carriage (42) by a second, fourth articulated connection (54) and in the steering system (46) by a second, third articulated connection (52).
    [6]
    6. Implement (14), according to claim 5, CHARACTERIZED by the fact that the steering system (46) comprises at least one hydraulic cylinder (102) trapped between the main car carrier (42) and at least one set of caterpillars (44).
    [7]
    7. Implement (14), according to claim 5, CHARACTERIZED by the fact that the steering system (46) includes a tie rod (154) connected between the two sets of endless tracks (44).
    [8]
    8. Implement (14), according to claim 1, CHARACTERIZED by the fact that it additionally comprises an articulated front support (110) connected to the main carriage carrier (42).
    [9]
    9. Implement (14), according to claim 1, CHARACTERIZED by the fact that the fourth articulated connection (54) is formed by an articulation operatively connected to the conveyor of the main carriage (42) and articulated fixed to at least one set of caterpillars (44).
    [10]
    10. Implement (14), according to claim 9, CHARACTERIZED by the fact that the third articulated connection (52) is defined by the steering system (46) connected to the articulation.
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    同族专利:
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    法律状态:
    2015-12-15| B03A| Publication of a patent application or of a certificate of addition of invention [chapter 3.1 patent gazette]|
    2017-10-31| B25D| Requested change of name of applicant approved|Owner name: CNH INDUSTRIAL AMERICA LLC (US) |
    2018-02-27| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-06-04| B06T| Formal requirements before examination [chapter 6.20 patent gazette]|
    2019-09-17| B06A| Notification to applicant to reply to the report for non-patentability or inadequacy of the application [chapter 6.1 patent gazette]|
    2020-01-07| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-03-10| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 30/01/2014, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US13/804,180|US9096264B2|2013-03-14|2013-03-14|Implement carrier with steerable tracks|
    US13/804,180|2013-03-14|
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