Patent Description:
Rotary hoes are well-known in the art. Rotary hoes are versatile and come in many sizes and with a vast variety of features depending on intended use.

One use of the rotary hoe is to remove weeds that emerge in the field. For this purpose, farmers prefer rotary hoes with long wings that can extend over a large part of the field, thus decreasing the time spent working in the field.

Thus, the problem with present day rotary hoes is that the long wingspan of the rotary hoe complicates storage, and transport of the machine from one location to another.

Thus, there is a need for solutions, which can decrease the time for hoeing and sowing of a field.

<CIT> discloses a jointed rockshaft with angularly adjustable segments having a joint structure facilitating the adjustment of the rotational angle of rockshaft segments relative to each other. The purpose of the flexible joint is to ensure the correct operating depth of tillage and seeding tools.

<CIT> discloses a rotary hoe implement with upstanding spacer members for connecting to a tool bar for drafting by a tractor.

<CIT> discloses a harvesting attachment comprising an inner part and at the two lateral ends of which the middle parts and outer parts are pivotable. The harvesting attachment can be folded into a transport position, where the outer parts relative to the middle parts are pivoted upwards and inwards and the middle parts are pivoted upwards.

It is an object of the invention to overcome the limitations of the prior art by providing a rotary hoe arrangement capable of decreasing the time needed for hoeing.

An object of the invention is achieved by a rotary hoe arrangement for weeding a field according to any of claims <NUM> to <NUM>. The rotary hoe arrangement comprises a tool bar.

The tool bar comprises a plurality of hoe wheels along the tool bar.

The tool bar further comprises a stationary central bar dividing the tool bar into two foldable wing sections, each wing section comprises an inner wing connected to an outer wing having a distal wing end.

The tool bar has an operational position, where the central bar, inner wings and outer wings define a straight work line, and a folded position, where the wing sections are folded for transportation to and from a field.

The skilled person would understand the width of the rotary hoe arrangement as the maximum extend of the rotary hoe arrangement along the work line.

The rotary hoe arrangement will be able to hoe a field when in the operational position as the width of the rotary hoe arrangement is maximized in the operational position.

The rotary hoe arrangement will be able to be transported to and from a field when in the folded position, because the width of the rotary hoe arrangement is minimized in the operational position.

Each inner wing is pivotably engaged with the central bar. Each inner wing pivots in an inner plane between an inner operational position and an inner folded position. Each inner wing extends along the straight work line, when positioned in the operational position. Each inner wing extends upwardly and substantially perpendicular to the straight work line, when in the inner folded position.

The inner wing extends vertically upwardly, which results in a rotary hoe arrangement, which is very compactly packed i.e. having a high number of rotary hoes per volume. In this case, the straight work line and the vertical axis define the inner plane in which each inner wing pivots.

The skilled person would recognize that when one of the inner wings pivots between the inner operational position and inner folded position, then will the outer wing connected to inner wing pivot in parallel to the inner plane.

Each wing section may be <NUM> long and the rotary hoe arrangement would become too high to be transported, if each outer wing just pivoted with the corresponding inner wing.

Each outer wing is pivotably engaged with the corresponding inner wing. Each outer wing pivots in an outer plane, which outer plane is tilted relative to the corresponding inner plane between an outer operational position and an outer folded position.

Each outer wing extends along the work line, when positioned in the outer work position. The distal wing end of each outer wing substantially faces the central bar and the outer wing is parallel to the corresponding inner wing and upwardly in the outer plane, when the outer wing is positioned in the outer folded position.

If each wing section of a rotary hoe arrangement has an inner wing in an inner operational position and an outer wing positioned in an outer folded position and both inner wings are pivoted from the inner operational position to the inner folded position, then the entire height of the rotary hoe arrangement will be substantially lower than if the outer wings were not pivotable.

This enables the rotary hoe arrangement to have longer wing sections while still being transportable, this increases the area which is hoed per pass and thus increases the efficiency.

Each outer wing is pivotal in the outer plane, which outer plane is tilted relative to the corresponding inner plane, this causes an off-set between the inner and outer wing of a wing section when the outer wing is in the outer folded form, such that the width of the rotary hoe arrangement decreases.

The transportation of rotary hoe arrangement is eased with decreasing width.

In an aspect of the invention, the central bar has a central bar width adapted for forming an equipment space between the wing sections.

An increase in the central bar width will cause the width of rotary hoe arrangement in the folded position and this will make the transportation of the rotary hoe arrangement more difficult, but this enables the rotary hoe arrangement to transport extra equipment.

The extra equipment space makes the rotary hoe arrangement more versatile as it may solve two tasks at the same time.

The skilled person would recognize that the equipment space is possible due to the wing sections, where each outer wing is pivotable in the outer plane which causes a decrease in the width of rotary hoe arrangement in the folded position. The decrease enables the central bar width to be increased thereby forming the equipment space between the wing sections and hoe wheels.

In an aspect of the invention, the rotary hoe arrangement comprises a sowing machine positioned in the equipment space.

Normally it would be very time consuming and expensive to sow after hoeing as the farmer must drive all the passes once more. However, the sowing machine positioned in the equipment space enables the farmer to hoe and sow at the same time. Thereby decreasing costs and time consumed.

The above mentioned case is especially advantage when hoeing in the winter. If the farmer at the same time sows grass or the like, then the farmer will reduce the amount of weed on the field. Furthermore, the grass is excellent at holding (i.e. storing) nitrates, which is beneficial to the crop which will be sowed in the spring.

The inner wing may be pivotably engaged with the central bar by a <NUM> degree folding joint.

Opposite to the central bar the inner wing may be pivotably engaged with the outer wing by a <NUM> degree folding joint.

In an aspect of the invention, each outer plane forms a <NUM>-<NUM> degrees angle with the corresponding inner plane.

The angle between the outer plane and corresponding inner plane enables a decrease in the width of the rotary hoe arrangement when in a folded position and/or an increase in the central bar width.

In an aspect of the invention, each outer plane forms a <NUM>-<NUM>-degree angle with the corresponding inner plane.

In an aspect of the invention, each outer plane forms a <NUM> degrees angle with the corresponding inner plane.

The folding joint may comprise a pair of parallel inner walls facing each other and extending from the inner wing, a pair of parallel outer walls extending from the outer wing, the inner and outer walls are substantially parallel with the outer plane and define a channel.

The folding joint may be positioned at the transition between the inner wing and the outer wing.

The inner and outer walls may be interconnected by a transverse rod, which define an axis of rotation. The transverse rod is positioned distal to the inner and outer wings.

The folding joint may comprise an inner joint element being positioned in the channel and being pivotally connected to the inner walls, the inner joint element has an inner joint element end extending partly around the transverse rod.

The folding joint may comprise an outer joint element being positioned in the channel and being pivotally connected to the outer walls, the outer joint element has an outer joint element end connected to the inner joint element end.

The folding joint may comprise a piston connected to the inner wing and in an opposite end relative to the inner wing connected to the inner joint element for moving the outer wing between the folded position and the operational position.

Thereby, the outer wing can be pivotally moved between an operational position to the folded position and back in a controlled way.

In an aspect of the invention, the tool bar may comprise a hoe rack. The hoe rack may comprise a pair of extension plates having a rod extending between the pair of extension plates. The rod may be substantially parallel to the tool bar. One or more hoe arms may be rotatably connected to the rod and may be connected to one or more rotary hoes. The rod defines the axis of rotation. If the rotary hoe arrangement is in an operation position then the axis of rotation substantially corresponds to straight work line, although there may be a slight off-set. The tool bar may further comprise a biasing system for applying a biasing force to one or more hoe arms and thus to the one or more rotary hoes. The effect of the biasing system is that an optimum field penetration is ensured.

The tool bar may comprise a plurality of hoe racks.

The one or more hoe arms of the hoe rack may have one or more anvils extending below the tool bar for engaging with the tool bar and preventing further rotation, the one or more anvils are adapted for engaging with the tool bar.

The biasing system may be adjusted such that each hoe arm and thus each rotary hoe attached to said arms experience a biasing force equal to <NUM>-<NUM> (<NUM>-<NUM> N), or more optimum <NUM>-<NUM> (<NUM>-<NUM> N) or most optimum <NUM> (<NUM> N).

A biasing force equal to <NUM> has in tests proven to have the best field penetration.

The technical effect of the biasing system and the one or more anvils extending below the tool bar is that the hoe arms and rotary hoes are stationary during folding and unfolding of the inner and outer wings by the biasing system forcing the one or more anvils towards the tool bar. Thereby, unwanted and uncontrolled movement is prevented and thus the risk of collision between rotary hoes is prevented, which is a risk during folding and unfolding of the tool bar.

In an aspect of the invention, the biasing system may comprise a biasing arm extending from the tool bar and having a displaceable hand end connected to a hoe arm. Displacement of the displaceable hand end causes an increase or a decrease of the biasing force on the hoe arm and thus on the rotary hoe.

The displaceable hand end may be linearly displaceable.

The skilled person would know how to make the hand end displaceable, the hand end could be displaceable by using pneumatics or hydraulics or an electrified actuator or a membrane.

In an embodiment, the biasing arm extends above the tool bar.

In another embodiment, the biasing arm extends below the tool bar.

Thereby, the biasing force on the one or more hoe arms and corresponding rotary hoes can be controlled individually, which ensures a more uniform treatment of a field.

In an aspect of the invention, the biasing system may comprise.

The biasing force is applied to the second torque spring arm by displacing the displaceable hand end and thereby said pole relative to the second torque spring arms. Thereby, a single biasing arm can control the biasing force on several hoe arms and thereby several hoe wheels. This will greatly reduce the complexity of the tool bar and thereby reduce the overall cost and running costs relative to the previously mentioned embodiments since there are fewer biasing arms.

In an aspect of the invention, the biasing arm may further comprise an intermediate piece between the hand end and the pole, the intermediate piece may be rotatable connected to the rod.

The intermediate piece ensures a controlled and consistent movement of the pole relative to the second torque spring arms.

In an embodiment, the intermediate piece comprises a curved part, where the biasing arm is rotatably connected to a first end of said curved part and the pole is connected to an opposite end of said curved part and the curved part partly encircles the rod.

The effect of the intermediate piece having a curved shaped is that it becomes easier to control the biasing force on the torque springs as the pole will apply a force on the same place on the second torque spring arms.

The above mentioned embodiments of hoe racks and biasing systems may with great effect be used with a foldable tool bar as the risk of collisions is limited by the hoe racks with a biasing system. However, the hoe racks and biasing systems can also be used with great effect on a non-foldable tool bar as the biasing systems ensure a suitable penetration of the rotary hoes.

An object of the invention is achieved by a vehicle connected to rotary hoe arrangement.

An object of the invention is achieved by use of a rotary hoe arrangement for weeding a field.

An object of the invention is achieved by use of a rotary hoe arrangement comprising a sowing machine for weeding and sowing a field at the same time.

An object of the invention is achieved by use of a vehicle for weeding a field.

Although well described above, a person skilled in the art may appreciate a similar description, which description may be an equivalent description. In such aspects, the following description may serve to support the disclosure or function as an example. Structural features recited in the following may be found to be supported in figures as required. A person skilled in the art will readily be able to identify technical features in the figures.

In an exemplary embodiment, a rotary hoe arrangement comprising a wing arrangement comprising at least two wing sections, each wing section configured to support multiple hoe arms each with a rotary element. The wing arrangement may be configured with a wing pivot between two wing sections arranged for the wing sections to pivot relative to each other in a section plane about a wing section angle and to fold the wing sections. The section plane may be seen in figures as an outer plane.

The wing pivot may be implemented as seen on the figures enclosed. The wing pivot may be as disclosed in <FIG>. The wind pivot may be operated as shown in <FIG>. A person skilled in the art will experiment with faces and angles to improve the fold of wing sections including enablement of rotary stars to be sandwiched, either with no overlap or partial overlap, and to optimize weight distribution and constructional moments. The wing pivot may be a foldable connection folding two sections in say <NUM>-degrees angle.

The rotary hoe arrangement of the exemplary embodiment may further comprise a support wing pivot at one of the two wing sections and configured to pivot the one wing section relative to a support in a support plane in a support angle. The support wing pivot may bend the wing arrangement relative to the support. The support plane may be seen from the figures as an inner plane. The support wing pivot may be a bendable connection bending the wing arrangement in say <NUM>-degrees.

The rotary arrangement may be configured with the support wing pivot and the section pivot arranged in an angle relative to each other, such that the section plane and the support plane intersect in an intersection angle. The angle between the planes is <NUM>-<NUM> degrees, optionally <NUM>-<NUM> degrees or say about <NUM>-<NUM> degrees. A starting angle may be <NUM> degrees.

The rotary hoe arrangement of the exemplary embodiment may further comprise a support configured with connection means for connection to a vehicle. The rotary hoe arrangement may be arranged with the support supporting the support wing pivot attached to one end of an inner wing section and configured for an operational position relative to the vehicle in an operational support angle and for a transport position relative to the vehicle in a transport support angle.

In an exemplary embodiment, the support and the least two wing sections are arranged with the wing pivot at the opposite end of the inner wing section, and with the wing pivot configured for an operational position relative to the vehicle in an operational section angle and for a transport position relative to the vehicle in a transport section angle.

In an exemplary embodiment, the support wing pivot and the wing pivot are arranged, such that in the operational positon the operational support angle and the operational section angle align the wing sections and extend from the support in a substantial linear way and with an operational extent from the support. The operational extent may be <NUM> or more, <NUM> or more, or <NUM> or more.

In an exemplary embodiment, the support wing pivot and the wing pivot are arranged, such that in the transport positon, the operational support angle and the operational section angle fold the wing sections with a height and a width from the support.

In an exemplary embodiment, the support has a center section and in one direction supports a first wing arrangement configured to extend in a first direction when in the operational position and a second wing arrangement configured to extend in a second direction and opposite direction of the first direction when in the operational position. The rotary hoe arrangement is configured such that the center section has a void space when the first wing arrangement and the second wing arrangement are in the transport position.

The void space is complementary in shape to the shape of a sow arrangement, such that the sow arrangement can fit into the void space.

In an exemplary embodiment the support further supports a center section configured to support multiple hoe arms each with a rotary element that are aligned with the wing sections when in the operational position.

The rotary hoe arrangement wherein the support is configured with a platform, the platform arranged to support a sow arrangement.

In an exemplary embodiment an agricultural arrangement comprising a rotary hoe arrangement and a sow arrangement. In such agricultural arrangement, the rotary hoe arrangement may be as disclosed or according to the figures. In such agricultural arrangement, the sow arrangement may be any off the shelf sow arrangement or according to the figures.

An exemplary embodiment is use of a vehicle comprising a rotary hoe arrangement and a sow arrangement.

In a particular use, the vehicle comprises a rotary hoe arrangement as disclosed or according to the figures. Such use may involve placement of a sow arrangement in front of the vehicle. In an aspect the sow arrangement is arranged in connection with the rotary hoe arrangement. In a particular aspect, the sow arrangement is placed in a void space of the rotary hoe arrangement in a transport position, that is when sections of the rotary hoe arrangement is bend or folded.

In an exemplary embodiment a vehicle comprising a rotary hoe arrangement in a transport position, the rotary hoe arrangement surrounds a sow arrangement in transport position, wherein the use in the transport position in a transport direction has a width of less than <NUM> meters, less than <NUM>, or less than <NUM> meters and a height of less than <NUM> meters or less than <NUM> meters.

In an exemplary embodiment, a rotary hoe arrangement in an operation position, wherein the use of the vehicle in an operation direction with the rotary hoe arrangement in the operational position the rotary hoe arrangement extends more than <NUM> meters or about <NUM> meters or more.

Embodiments of the invention will be described in the figures, whereon:.

<FIG> illustrates a vehicle <NUM> with a rotary hoe arrangement <NUM> and a sowing machine <NUM>.

The rotary hoe arrangement <NUM> is positioned in an operational position <NUM> and would be ready to hoe and sow if the vehicle <NUM> was in a field.

The rotary hoe arrangement <NUM> comprises a tool bar <NUM> with a central bar <NUM> and a first and a second wing section 40I, 40II, which extend along a straight work line <NUM> when the rotary hoe arrangement <NUM> is positioned in an operational position <NUM>. The central bar <NUM> is on both sides connected to the first and the second wing section 40I, 40II.

Each wing section 40I, 40II comprises an inner wing 42I, 42II pivotably engaged with the central bar <NUM> by a <NUM> degree folding joint 41I, 41II.

Opposite to the central bar <NUM> the inner wing 42I, 42II is pivotably engaged with an outer wing 44I, 44II by a <NUM> degree folding joint 43I, 43II.

Each outer wing 44I, 44II has a distal wing end 45I, 45II, which when the rotary hoe arrangement <NUM> is positioned in an operational position <NUM> define a maximum width of the rotary hoe arrangement <NUM>.

The sowing machine <NUM> is positioned in the equipment space <NUM>.

<FIG> illustrates a rotary hoe arrangement <NUM> in an operational position <NUM> and a folded position <NUM>.

The skilled person would know that the rotary hoe arrangement <NUM> cannot be in both the operational position <NUM> and the folded position <NUM> at the same time, however <FIG> illustrates the differences between the two positions, such as a maximum and a minimum width of the rotary hoe arrangement <NUM>.

The rotary hoe arrangement <NUM> is peculiar in that it has an equipment space <NUM> in the folded position <NUM> and in the operational position <NUM>.

This enables the rotary hoe arrangement <NUM> to have more functions other than hoeing.

Furthermore, the extra equipment can be transported with the rotary hoe arrangement <NUM> as a single unit since the equipment space <NUM> is also available in the folded position.

<FIG> illustrates a rotary hoe arrangement <NUM> in a folded position <NUM>.

The rotary hoe arrangement <NUM> is shown with only few hoe wheels <NUM> but the tool bar <NUM> would have hoe wheels <NUM> along its entire width when in intended use.

<FIG> illustrates a top view of a rotary hoe arrangement <NUM> in a folded position <NUM>. The <FIG> discloses how hoe wheels <NUM> are positioned relative to each other and that there is equipment space <NUM>.

The wing section <NUM> comprises an inner wing <NUM> pivotably engaged with the central bar <NUM> by a <NUM> degree folding joint <NUM>.

Opposite to the central bar <NUM> the inner wing <NUM> is pivotably engaged with an outer wing <NUM> by a <NUM> degree folding joint <NUM>.

The outer wing <NUM> has a distal wing end <NUM> which when the rotary hoe arrangement <NUM> is positioned in an operational position <NUM> define a maximum width of the rotary hoe arrangement <NUM>.

<FIG> illustrates a joint between an inner wing <NUM> and an outer wing <NUM>.

The joint is a <NUM> degree folding joint <NUM>.

<FIG>and <FIG> show to different perspectives.

<FIG> illustrates the <NUM> degree folding joint <NUM> in greater detail. The folding joint <NUM> is positioned between the inner wing <NUM> and the outer wing <NUM>.

The folding joint <NUM> comprises a pair of parallel inner walls <NUM> facing each other and extending from the inner wing <NUM>, a pair of parallel outer walls <NUM> extending from the outer wing <NUM>, the inner and outer walls <NUM>,<NUM> are parallel with the outer plane and defining a channel <NUM>.

The inner walls <NUM> are named inner walls <NUM>, because they extend from the inner wing <NUM>. The outer walls <NUM> are named inner walls <NUM>, because they extend from the outer wing <NUM>.

The inner and outer walls <NUM>, <NUM> are interconnected by a transverse rod <NUM>, which defines an axis of rotation <NUM>. The transverse rod <NUM> is positioned distal to the inner and outer wings <NUM>, <NUM>.

The folding joint <NUM> comprises an inner joint element <NUM> being positioned in the channel <NUM> and being pivotally connected to the inner walls <NUM>, the inner joint element <NUM> has an inner joint element end <NUM> extending partly around the transverse rod <NUM>.

The folding joint <NUM> comprises an outer joint element <NUM> being positioned in the channel <NUM> and being pivotally connected to the outer walls <NUM>, the outer joint element <NUM> has an outer joint element end <NUM> connected to the inner joint element <NUM>.

The folding joint <NUM> comprises a piston <NUM> connected to the inner wing <NUM> and connected to the inner joint element <NUM> for moving the outer wing <NUM> between the folded position <NUM> and the operational position <NUM>.

<FIG> illustrates an unfolding of an outer wing <NUM>.

<FIG> illustrates a first embodiment of a hoe rack <NUM> from four different views. The hoe rack <NUM> is positioned along a tool bar <NUM>.

The hoe rack <NUM> comprises a pair of extension plates <NUM> having a rod <NUM> extending between the pair of extension plates <NUM>, the rod <NUM> being substantially parallel to the tool bar <NUM>.

The hoe rack <NUM> further comprises hoe arms <NUM> rotatably connected to the rod <NUM> and distal to the rod <NUM> being connected to rotary hoes <NUM>.

The hoe arms <NUM> of the hoe rack <NUM> comprise anvils <NUM> extending below the tool bar <NUM>, the anvils <NUM> are adapted for engaging with the tool bar <NUM>. Thereby, unwanted clockwise rotation is prevented.

The hoe rack <NUM> further comprises a biasing system <NUM> for applying a biasing force to the one or more hoe arms <NUM> and the one or more rotary hoes <NUM>.

The biasing system <NUM> together with the anvils <NUM> ensures that rotary hoes <NUM> do not collide, if the tool bar <NUM> is of the kind which can be folded and unfolded.

The biasing system <NUM> comprises biasing arms <NUM> extending from below the tool bar <NUM>. The biasing arms <NUM> have displaceable hand ends <NUM> connected to hoe arms <NUM> for applying the biasing force to the hoe arms <NUM>.

<FIG> illustrates a second embodiment of a hoe rack <NUM> from four different views. The hoe rack <NUM> is positioned along a tool bar <NUM>.

The biasing system <NUM> comprises biasing arms <NUM> extending from above the tool bar <NUM>. The biasing arms <NUM> have displaceable hand ends <NUM> connected to hoe arms <NUM> for applying the biasing force to the hoe arms <NUM>.

The hoe arms <NUM> have an upwardly extending protrusion for engaging with the displaceable hand ends <NUM>.

<FIG> illustrates a third embodiment of a hoe rack <NUM>. The hoe rack <NUM> is positioned along a tool bar <NUM>.

The biasing system <NUM> together with the anvils <NUM> ensures that rotary hoes <NUM> dot no collide, if the tool bar <NUM> is of the kind which can be folded and unfolded.

The biasing system <NUM> comprises torque springs <NUM> positioned next to the hoe arms <NUM> along the rod <NUM>. The torque springs <NUM> have a first torque spring arm <NUM> connected to a hoe arm <NUM> and a second torque spring arm <NUM>.

The biasing system <NUM> further comprises a biasing arm <NUM> extending from below the tool bar <NUM> and having a displaceable hand end <NUM> connected to a pole <NUM> positioned transverse to the second torque spring arms <NUM> for applying a biasing force to the one or more torque springs <NUM>.

The biasing arm <NUM> further comprises an intermediate piece <NUM> between the hand end <NUM> and the pole <NUM>, the intermediate piece <NUM> being rotatable connected to the rod <NUM>.

The intermediate piece <NUM> comprises a curved part, where the biasing arm <NUM> is rotatably connected to a first end of said curved part and the pole <NUM> is connected to an opposite end of said curved part and the curved part partly encircles the rod <NUM>.

The effect of the intermediate piece <NUM> having a curved shaped is that it becomes easier to control the biasing force on the torque springs <NUM> as the pole <NUM> will apply a force on the substantially same place on the second torque spring arms <NUM>.

<FIG> illustrates a fourth embodiment of a hoe rack <NUM>. The hoe rack <NUM> is positioned along a tool bar <NUM>.

The biasing system <NUM> further comprises a biasing arm <NUM> extending from above the tool bar <NUM> and having a displaceable hand end <NUM> connected to a pole <NUM> positioned transverse to the second torque spring arms <NUM> for applying a biasing force to the one or more torque springs <NUM>.

The biasing arm <NUM> further comprises an intermediate piece <NUM> between the hand end <NUM> and the pole <NUM>, the intermediate piece <NUM> being rotatable connected to the rod <NUM>. The intermediate piece <NUM> comprises a curved part, where the biasing arm <NUM> is rotatably connected to a first end of said curved part and the pole <NUM> is connected to an opposite end of said curved part and the curved part partly encircles the rod <NUM>.

Claim 1:
A rotary hoe arrangement (<NUM>) for weeding a field, the rotary hoe arrangement (<NUM>) comprising
- a tool bar (<NUM>) comprising a plurality of hoe wheels (<NUM>) along the tool bar (<NUM>), two foldable wing sections (40I, 40II) divided by a central bar (<NUM>), each wing section (40I, 40II) comprises an inner wing (42I, 42II) connected to an outer wing (44I, 44II) having a distal wing end (45I, 45II),
- the tool bar (<NUM>) having an operational position (<NUM>), where the central bar (<NUM>), inner wings (<NUM>) and outer wings (<NUM>) define a straight work line (<NUM>), and a folded position (<NUM>) where the wing sections (40I, 40II) are folded for transportation to and from a field,
- each inner wing (42I, 42II) being pivotably engaged with the central bar (<NUM>), each inner wing (42I, 42II) pivots in an inner plane between an inner operational position, where the inner wing (42I, 42II) extends along the straight work line (<NUM>), and an inner folded position, where the inner wing (42I, 42II) extends vertically upwardly and substantially perpendicularly to the straight work line (<NUM>), characterised in that
- each outer wing (44I, 44II) being pivotably engaged with the corresponding inner wing (42I, 42II), each outer wing (44I, 44II) pivots in an outer plane (48I, 48II) being tilted relative to the corresponding inner plane between an outer operational position, where the outer wing (44I, 44II) extends along the straight work line (<NUM>), and an outer folded position, where the distal wing end (45I, 45II) substantially faces the central bar (<NUM>) and the outer wing (44I, 44II) is parallel to the corresponding inner wing (44I, 44II) and positioned upwardly in the outer plane, and where each outer plane (48I, 48II) forms a <NUM>-<NUM> degree angle with the corresponding inner plane.