• 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:
    SAM | / IAN DRAG Agricultural implements (1) for tillage, comprising a drawbar (2), for coupling the agricultural implement (1) to a towing vehicle (50) by means of a towing coupling (3), a front frame portion (4), at which laterally separated end portions front wheels (5) are arranged via respective guide spindles (6), the drawbar (2) being hinged relative to the front frame portion (4) about at least one vertical axis (7). The agricultural implement (1) comprises further link arms (8, 9), which connect the guide spindles (6) to the drawbar (2), so that the front wheels (5) pivot when the drawbar (2) is rotated relative to the front frame portion (4), and at least a first container ( 10) for dispensable material, the center of gravity, at least at maximum load, is located between the front frame portion (4) and the drawbar coupling (3), and which container (10) is fixed relative to the drawbar (2). Publication figure: Fig. 2
    公开号:SE1451417A1
    申请号:SE1451417
    申请日:2014-11-24
    公开日:2016-05-25
    发明作者:Per Gyllenhammar；Henrik Johansson；Crister Stark
    申请人:Väderstad Holding Ab；
    IPC主号:
    专利说明:

    TECHNICAL FIELD TECHNICAL FIELD This document relates to agricultural implements comprising tillage tools, such as seed drills. The concepts shown in the document are also applicable to other types of tillage implements, such as fertilizer spreaders, pesticide spreaders, harrows and cultivators, and to combinations thereof.
    BackgroundHistorically, agricultural implements for discharging material or liquid to the ground have been provided with a container for seed, fertilizer or pesticide, which has been placed on the agricultural implement. In the case of seed drills, the container originally had the same width as the seed drill itself.
    When the tractors and farms became larger, new solutions were required and, for example, the seed drills often became pneumatic, ie. the seed is discharged from the container to the seed coulters through lines of an air stream driven by a single fan, which enabled machines with a large working width to be built. As the machines became larger, so did the demands on the volume seed / fertilizer / chemical agents that could be carried. When it became difficult to carry the increasing volume (weight) in a container on the seed drill, a solution was found with a trolley with a container (a "cart") which is connected to or after a seed drill. This cart makes it possible to carry larger quantities of seed and fertilizer.
    A disadvantage of this design is that the seed drills become long and still have to be provided with more than one wheel axle in order for the weight of the machine to be evenly distributed over a larger area on the ground. A multi-axle agricultural machine tends to make narrow turns after the towing vehicle when the towing vehicle turns, which means that the towing vehicle must take out the turns and turn with a large turning radius about the towing vehicle and the subsequent agricultural machine e.g. must turn or give way to an obstacle. By the agricultural machine significantly cut into curves, ie. the agricultural machine does not follow in the footsteps of the towing vehicle, the sleeve machines, for example due to roundabouts, speed bumps, buildings, signs and other obstacles are difficult to move on, for example, roads and other areas where the agricultural implement may be driven. Even when turning in fields, this type of machine is awkward, especially if the fields are small and / or irregular. SE 515 956 shows an agricultural machine where a link arm is connected to a front wheel axle and articulated with a frame arranged by an agricultural machine around a substantially vertical first axis. A guide means is arranged between the drawbar, which can be coupled to a towing vehicle, and the frame, for controlling the rotation of the link arm about the first axis when the towing vehicle pivots, so that the agricultural machine pivots at least less than the towing vehicle.
    Summary One purpose is to provide an alternative or improved agricultural implement for tillage with steerable axles that is easy to maneuver and easy to move.
    According to a first aspect, an agricultural implement is provided for tillage, comprising a drawbar for coupling an agricultural implement to a towing vehicle by means of a towing coupling, a front frame portion, at which laterally separated end portions front wheels are arranged via respective guide spindles, the drawbar being relatively envertical axis. The agricultural implement further comprises link arms which connect the guide spindles to the drawbar so that the front wheels pivot when the drawbar is rotated relative to the front frame portion, and at least a first container of pre-feedable material, the center of gravity of which, at least at maximum load, is between the front frame portion and the coupling. in relation to the drawbar. Agricultural tillage implements are agricultural implements such as seed drills, but also other types of tillage implements, such as spreaders for fertilizers, lime or pesticides, harrows, cultivators and combinations thereof.
    Container means a container for discharging solid or liquid material, such as seeds, plants, fertilizers, pesticides or soil improvers (lime, soil, etc.) to land, over which the agricultural implement travels. The container may be of the type provided with fan pre-generation of air pressure for discharging the material. l / joint "vertical axis" here refers to an axis that is the vertical local agricultural implement located on a horizontal surface.
    A "frame section" can, in the broadest sense of the term, consist of a single beam, of any cross-section, usually square or circular. Alternatively, a frame portion may consist of an assembly of joined beams, which are arranged that, when the agricultural implement is set up on level ground and in a working condition, extend at least in two horizontal directions, which may, but must not, be perpendicular to each other. The film portion may extend substantially in a plane, but may also be up or down concave or convex. The frame portion can also have upwardly or downwardly projecting parts, for example to e.g. form attachment points for wheels (support wheels or transport wheels). As a further alternative, a frame section may have the function of supporting one or more additional frame sections. The frame portion consists of a substantially rigid unit, ie. a unit that does not deform in shape beyond the deformation of the material under load.
    The placement of the container means that both towing vehicles and agricultural implements are loaded by the weight of the container (plus weight from any contents in the container).
    When the agricultural implement is connected to the towing vehicle, e.g. a tractor, the drawbar controls the front wheels of the agricultural implement via link arms and steering spindles in such a way that the agricultural implement follows the towing vehicle in a predetermined manner. This results in an agricultural implement for tillage that is easy to maneuver and easy to move.
    The link arms and steering spindles can be designed so that the front wheels turn less than the towing vehicle.
    The front wheels of the agricultural implement can then be steered so that they turn at too small an angle, whereby the agricultural implement is forced to turn with a larger radius than if the front wheels were not understeered, ie the agricultural implement is allowed to follow in the tractor vehicle's. The towing vehicle then does not have to turn with the same turning radius as when the wheels are not understeered by the towing vehicle and the subsequent agricultural implement e.g. must turn or give way to an obstacle.
    The agricultural implement may further comprise an implement section which is horizontally not, or to a limited extent, pivotally connected to that front frame portion. "Horizontally pivotable" means pivoting about a vertical geometric axis.
    The fact that the implement section is horizontally limited pivotably connected to the front frame portion may mean that a rotation of a maximum of 10 °, preferably a maximum of 5 ° is still allowed.
    The agricultural implement may further comprise at least two pivot wheels, which are arranged at a greater distance from a center axis of the agricultural implement extending in a direction of travel than the front wheels.
    According to a second aspect, an agricultural implement is provided for tillage, comprising a drawbar for coupling agricultural implements to a towing vehicle, a front frame portion, at which laterally spaced end portions front wheels are arranged via respective front guide spindles, the drawbar being hinged relative to the front frame portion. further comprises front link arms, which connect the guide spindles to the drawbar, so that the front wheels pivot when the drawbar is rotated relative to the front frame portion. The agricultural implement further comprises a longitudinal frame portion, which is articulated relative to the drawbar about at least one vertical axis, and a rear frame portion, which is articulated relative to a rear end portion of the longitudinal frame portion about at least one vertical axis. The agricultural implement also includes rear wheels in the lateral rear wheel. separate end portions via respective rear guide spindles, and rear link arms, which connect the rear guide spindles to the longitudinal frame portion, so that the rear wheels pivot when the longitudinal frame portion is rotated relative to the rear frame portion.
    The agricultural implement according to the second aspect enables that even long or even very long agricultural implements can be easily maneuvered and moved when the front wheels and rear wheels are controlled in such a way that the agricultural implement follows the towing vehicle in a predetermined manner.
    The agricultural implement may further comprise at least one second container of pre-feedable material, the center of gravity of which, at least at maximum load, is between the front and rear frame portions. l / led agricultural implements according to this aspect, the agricultural implements can be provided with larger containers than with agricultural implements according to the first aspect.
    The second container may be fixed relative to the longitudinal frame portion.
    The agricultural implement may further comprise at least one first container of pre-feedable material, which is at least partially arranged between the front frame portion and the traction coupling.
    The center of gravity of the first container can, at least at maximum load, be between the front frame portion and the towing coupling, so that both towing vehicles and agricultural implements are loaded by the weight of the container (plus the weight of any contents in the container). The first container can be fixed in relation to the drawbar.
    An agricultural implement equipped with both a first and a second container results in a larger volume of solid or liquid material for discharge to land over which the agricultural implement travels can be carried with the agricultural implement than with agricultural implements equipped with only a first or second container.
    The steering joints and the link arms can be designed so that the front wheels and / or rear wheels turn less than the towing vehicle.
    The agricultural implement may further comprise an implement section which is horizontally not, or to a limited extent, pivotally connected to that rear frame portion.
    The agricultural implement may further comprise at least two pivot wheels, which are arranged at a greater distance from a center axis of the agricultural implement extending in a direction of travel than the front wheels and / or the rear wheels.
    In both the first and second aspects of the agricultural implement, the implement section may have a greater width in one direction across a direction of travel, than the front frame portion.
    In both the first and second aspects of the agricultural implement, the implement section may comprise a plurality of tillage tools, selected from a group consisting of harrow tines, cultivator tines, leveling tools, disc tools, deep picking tools, tipping units, packer wheels and material discharge devices.
    Brief description of the drawings Fig. 1 shows a top view of an agricultural implement according to a first embodiment but without a container.
    Fig. 2 shows a top view of an agricultural implement with a container according to a first embodiment, coupled to a towing vehicle and provided with a co-implement section.
    Fig. 3 shows an agricultural implement according to a second embodiment seen from above.
    Fig. 4 shows the agricultural implement in Fig. 2 seen from above connected to a towing vehicle and equipped with an implement section.
    Fig. 5 shows an agricultural implement seen from above according to a second embodiment where the agricultural implement is equipped with a container, connected to a single-vehicle vehicle and equipped with an implement section.
    Fig. 6 shows the agricultural implement in Fig. 5 seen from the side and provided with a different tool section than in Fig. 5.
    Description of embodiments with reference to Fig. 1 and Fig. 2, an agricultural implement 1 for tillage according to a first embodiment comprises a drawbar 2 for coupling the agricultural implement 1 to a towing vehicle 50 (eg a tractor as in Fig. 2) by means of a draw coupling 3. l / led agricultural implements 1 for tillage refers to agricultural implements such as seed drills (shown in Fig. 2), but also other types of tillage implements, such as spreaders for fertilizer, lime or pesticides, harrows, cultivators (shown in Fig. 6) and combinations thereof.
    An exemplary transverse front frame portion 4 is provided with front wheels 5 on laterally separated end portions of the frame portion 4. The front wheels 5 are arranged with respective guide spindles 6 to the frame portion 4. Figures 1 and 2 show double pairs of wheels, but the number of wheels 5 arranged at the front frame portion 4 can also be two, as shown in Figs. 3 and 4 for an agricultural implement according to a second embodiment. Alternatively, more than four wheels 5, e.g. six or eight wheels 5, arranged at the front frame portion 4 via respective guide spindles 6.
    The drawbar 2 is hinged relative to the front frame portion 4 about a vertical axis 7, i.e. a shaft 7 which is vertical when the agricultural implement 1 is on a horizontal surface.
    The agricultural implement 1 further comprises link arms 8, 9, which connect the steering spindles 6 with the drawbar 2, so that the front wheels 5 pivot the drawbar 2 is rotated relative to the front frame portion 4. Fig. 2 shows how the front wheels 5 pivot when the drawbar 2 is rotated relative to the front frame portion 4. The number of link arms can vary but is preferably two.
    The presence of steering spindles 6 means that the wheels of the agricultural implement 1 have essentially maintained a support surface, even in sharp turns.
    A container 10 for dispensable material and which is fixed relative to the drawbar 2 is placed so that its center of gravity, at least at maximum load, is located between the front frame portion 4 and the draw coupling 3 of the agricultural implement 1.
    The container 10 is a container for discharging solid or liquid material, such as seeds, plants, fertilizers, pesticides or soil improvers (lime, soil, etc.) to soil, over which the agricultural implement 1 travels. The container 10 may be of the type provided with, or connected to, a fan for generating air pressure for discharging the material, as is often the case with seed drills.
    The location of the container 10, see Fig. 2, means that both towing vehicle 50 and agricultural implements 1 are loaded by the weight of the container 10 (plus weight from any contents in the container).
    It is desirable to distribute the weight between the towing vehicle and the front wheel 5 of the agricultural implement so that a positive, but not too large, load is placed on the towing coupling 3. In addition, the load should preferably not be negative, ie. act as a lift on the traction coupling 3.
    There is usually an upper limit for how much paint clutch 3 is loaded with paint. The proportion of the weight of the container 10 and any contents placed on the towing coupling may be 10 ° /> - 90 ° /> of the maximum load of the towing coupling, preferably 20 ° / -. ~ - 75 ° /> or 20 ° /> - 50 ° / > of the maximum load of the traction coupling. In addition, it is often desirable to load the front wheels 5 with at least 50 ° / -. ~, Preferably at least 60 ° /> or at least 70 ° />, of the container 10 and possibly contain load.
    When the agricultural implement 1 is connected to the towing vehicle 50, the guide drawbar 2 of the front wheel 5 of the agricultural implement 1 via link arms 8, 9 and steering spindles 6 in such a way that the agricultural implement 1 follows the towing vehicle 10 in a predetermined manner. Thereby an agricultural implement 10 is obtained for tillage which is easy to maneuver and easy to move.
    The steering spindles 6 and the link arms 8, 9 can be designed so that the front wheels 5 pivot less than the towing vehicle 50.
    Thus, the front wheels 5 can be steered so that they turn at too small an angle, whereby the agricultural implement 1 is forced to turn with a larger radius than if the front wheels 5 had not been understeered, ie. agricultural implement 1 can be included in the towing vehicle's 50 tracks.
    An implement section 20, see Fig. 2, may be horizontally not, or limited, pivotally connected to the front frame portion 4. Fig. 2 shows a single implement section 20 in the form of a sewing machine comprising leveling tools, disc tools, row units and packer wheels.
    The tool section 20 may, as shown in Fig. 2, have a greater width in one direction across a direction of travel, than the front frame portion 4. The tool section 20 may comprise a plurality of tillage tools, selected from a group of harrow tines, cultivator tines, leveling tools, pliers, pliers, pliers , packer wheels and material dispensers.
    The agricultural implement 1 can also be provided with at least two pivot wheels (not shown), which are arranged at greater distances from a center axis C of the agricultural implement 1 extending in one direction of travel than the front wheels 5. The pivot wheels provide extra support and relief and can also be used for depth control 20. Referring to Figures 3 to 6, an agricultural implement 1 'according to another embodiment comprises a drawbar 2', for coupling the agricultural implement 1 'to a towing vehicle 50 by means of a towing coupling 3'. In the example, a transverse front frame portion 4 'is provided with front wheels 5' on laterally separated end portions of the frame portion 4 '. The front wheels 5 'are arranged via the respective front steering spindles 6' to the frame portion 4 '. The drawbar 2 'is hinged relative to the front frame portion 4' about a vertical axis 7 '. The agricultural implement 1 'further comprises front link arms 8', 9 ', which connect the guide spindles 6' to the drawbar 2 ', so that the front wheels 5' pivot when the drawbar 2 'is rotated relative to the front frame portion 4'.
    In this respect, the agricultural implement 1 'according to the second embodiment is similar to the agricultural implement 1 according to the first embodiment. However, the agricultural implement 1 'according to the second embodiment further comprises a longitudinal frame portion 11', which in a front end portion is hinged relative to the drawbar 2 'about at least one vertical axis 7', and an exemplary transverse rear frame portion 14 ', which is hinged relative to a rear end portion of the longitudinal frame portion 11 'about a vertical axis 17', i.e. a shaft 7 'which is vertical when the agricultural implement 1 is on a horizontal surface. Rear wheels 15 'are attached to the laterally separated end portions of the rear frame portion via respective rear guide spindles 16'. Figures 3 and 4 show double pairs of wheels, but the number of wheels 15 'arranged at the rear frame portion 14' can also be two, or more than four wheels 15 ', e.g. six or eight wheels 15 '.
    Rear link arms 18 ', 19' connect the rear guide spindles 16 'to the longitudinal frame portion 11', so that the rear wheels 15 'pivot when the longitudinal frame portion 11' is rotated relative to the rear frame portion 14 '. The number of link arms connecting the guide spindles 16 'to the longitudinal frame portion 11' may vary but is preferably two. Figures 4 and 5 show how the front wheel 5 'and rear wheel 15' pivot the drawbar 2 is rotated relative to the front frame portion 4 'and the longitudinal frame portion 1 1' is rotated relative to the rear frame portion 14 'when the towing vehicle 50s the agricultural implement 1' according to the second aspect. or even very long agricultural implements 1 'can be easily maneuvered and moved when the front wheels 5' and rear wheels 15 'are steered in such a way that the agricultural implements 1' follow the towing vehicle 50 in a predetermined manner.
    The guide joints 8 ', 9', 18 ', 19' and the link arms can be designed so that the front wheels 5 'and / or the rear wheels 15' pivot less than the towing vehicle 50, as shown in Figs. 4 and 5.
    The agricultural implement 1 'according to the second embodiment may comprise containers for dischargeable material, the center of gravity of which, at least at maximum load, is located between the front and rear frame portions 4', 14 '(not shown). The container may be fixed in relation to the longitudinal frame portion 1 1 '.
    The agricultural implement 1 'according to this second embodiment can be provided with larger containers than the agricultural implement 1 according to the first embodiment described above.
    The agricultural implement 1 'according to the second embodiment can alternatively provide an additional container for dispensable material (visasj), which is at least partially arranged between the front frame portion 4' and the drawbar coupling 3 'and which can be fixed in relation to the drawbar 2'.
    The center of gravity of the additional container can, at least at maximum load, be located between the front frame portion 4 'and the towing coupling 2', so that both towing vehicle 50 and agricultural implements 1 'are loaded with the weight of the container (plus weight from any contents in the container).
    The location of the additional container may be the same as that of the container 10 in the first embodiment of the agricultural implement 1 described above.
    The agricultural implement 1 'according to this second embodiment may, just like the agricultural implement 1 according to the first embodiment as described above, further comprise an implement section 20, which in the second embodiment is horizontally not or limited pivotally connected to the rear frame portion 14', see Figs. 4, 5 and 6.
    The agricultural implement 1 'may further comprise at least two pivot wheels, which are arranged at a greater distance from a center axis C of the agricultural implement 1' extending in a direction of travel than the front wheels 5 'and / or the rear wheels 15'.
    Figures 4 and 5 show an implement section which is at a greater distance from the center axis (see Figures 3) than both the front wheels 5 'and the rear wheels 15'.
    The gear section 20 may, as shown in Figs. 4 and 5, have a greater width in one direction across a direction of travel, than the front frame portion 4 '.
    The implement section 20 in the second embodiment, the agricultural implement 1 'may, just as in the first embodiment, comprise a plurality of tillage tools.
    It will be appreciated that the transverse frame portions 4, 4 ', 14' may consist of a single beam, as shown in the drawings, or of other parts which extend laterally between the wheels, for example constructed according to a truss principle.
    In the same way, a longitudinal frame portion can consist of one or more laterally central beams, or of beams, seen laterally, which are located at a significant distance between the center line C and the wheel spindle.
    It is also understood that an agricultural implement according to the principles shown herein can be constructed with fixed wheel axles relative to the front and rear frame portions, respectively, said front and rear frame portions being pivotable relative to a longitudinal frame portion about at least one vertical axis. Under such a construction, the entire transverse frame portion would pivot relative to the longitudinal frame portion.
    权利要求:
    Claims (14)
    [1]
    Agricultural implements (1) for tillage, comprising: a drawbar (2), for coupling the agricultural implement (1) to a towing vehicle (50) by means of a towing coupling (3), a front frame portion (4), at which laterally separated end portions of front wheels (5) are arranged via respective guide spindles (6), the drawbar (2) being articulated relative to the front frame portion (4) about at least one vertical axis (7), link arms (8, 9) which connect the guide spindles (6) to the drawbar (2), so that the front wheels (5) pivot when the drawbar (2) is rotated relative to the front frame portion (4), and at least one first container (10) for discharge material, the center of gravity, at least at maximum load, is between that front frame portion ( 4) and the drawbar coupling (3), and which container (10) is fixedly attached to the drawbar (2).
    [2]
    Agricultural implement according to claim 1, wherein the steering spindles (6) and the link arms (8, 9) are designed so that the front wheels (5) pivot less the towing vehicle (50).
    [3]
    An agricultural implement (1) according to any one of the preceding claims 1 or 2, further comprising an implement section (20) which is horizontally not, or limited, pivotally connected to said front frame portion (4).
    [4]
    Agricultural implement (1) according to any one of the preceding claims 1-3, further comprising at least two pivot wheels, which are arranged at a greater distance from a center axis (C) extending in a direction of travel in the agricultural implement (1) than the front wheels (5).
    [5]
    Agricultural implements (1 ') for tillage, comprising: a drawbar (2'), for coupling the agricultural implement (1 ') to a towing vehicle (50) by means of a towing coupling (3'), 13 a front frame section (4 '), at which laterally spaced end portions front wheels (5 ') are arranged via respective front guide spindles (6'), the drawbar (2 ') being hinged relative to the front frame portion (4') about at least one vertical axis (7 '), front link arms ( 8 ', 9'), which connect the guide spindles (6 ') to the drawbar (2'), so that the front wheels (5 ') pivot when the drawbar (2') rotates relative to the front frame portion (4 '), a longitudinal frame portion (11') , which in a front end portion is articulated relative to the drawbar (2 ') about at least one vertical axis (7') a rear frame portion (14 '), which is articulated relative to a rear end portion of the longitudinal frame portion (11') about at least one vertical axis ( 17 '), rear wheels (15'), which are attached to the rear frame portion (14 ') in laterally spaced end portions via respective rear guide pins parts (16 '), rear link arms (18', 19 '), which connect the rear guide spindles (16') to the longitudinal frame portion (11 '), so that the rear wheels (15') pivot when the longitudinal frame portion (11 ') is rotated relative to the rear frame portion (14 ').
    [6]
    Agricultural implement (1 ') according to claim 5, further comprising at least one other container for dispensable material, the center of gravity of which, at least at maximum load, is located between the front and rear frame portions (4', 14 ').
    [7]
    An agricultural implement (1 ') according to claim 6, wherein the second container is fixed relative to the longitudinal frame portion (11').
    [8]
    Agricultural implement (1 ') according to any one of claims 5 to 7, further comprising at least one first container (10) for discharge material, which is at least partially arranged between the front frame portion (4') and the traction coupling (3 ').
    [9]
    Agricultural implement according to claim 8, wherein the first container (10) is fixed in relation to the drawbar (2 '). 14
    [10]
    Agricultural implement (1 ') according to any one of claims 5 to 9, wherein the steering spindles (6', 16 ') and the link arms (8', 9 ', 18', 19 ') are designed so that the front wheels (5') and / or the rear wheels (15 ') turns less than the towing vehicle (50).
    [11]
    An agricultural implement (1 ') according to any one of claims 5 to 10, further comprising an implement section (20) which is horizontally not, or limited, pivotally connected to said rear frame portion (14').
    [12]
    Agricultural implement (1 ') according to any one of claims 5 to 11, further comprising at least two pivot wheels, which are arranged at a greater distance from a center axis (C) extending in one direction of travel with the agricultural implement (1') than the front wheels (5 ') and / or rear wheels (15 ').
    [13]
    An agricultural implement (1, 1 ') according to claim 3 or 11, wherein the implement section (20) has a greater width in a direction across a one-way direction, than the front frame portion (4, 4').
    [14]
    An agricultural implement (1, 1 ') according to claim 3, 11 or 13, wherein the implement section (20) comprises a plurality of tillage tools, selected from the group consisting of harrow tines, cultivator tines, leveling tools, disc tools, deep plucking tools, tipping units, packer feed wheels and material.
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    同族专利:
    公开号 | 公开日
    WO2016085390A1|2016-06-02|
    SE539689C2|2017-10-31|
    EP3223595B1|2022-01-12|
    EP3223595A1|2017-10-04|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1451417A|SE539689C2|2014-11-24|2014-11-24|Agricultural implements for tillage, which has controllable axles|SE1451417A| SE539689C2|2014-11-24|2014-11-24|Agricultural implements for tillage, which has controllable axles|
    PCT/SE2015/051256| WO2016085390A1|2014-11-24|2015-11-23|Agricultural implement for soil working, having steerable axles|
    EP15817603.2A| EP3223595B1|2014-11-24|2015-11-23|Agricultural implement for soil working, having steerable axles|
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