Agricultural implements and methods of setting lateral tool spacing of an agricultural implement

Abstract

An agricultural implement (1) comprises a laterally extending frame section (101) with a first set of frame segments (13a, 13b, 13e; 13c, 13d, 13f) of which at least two support a soil working tool (14a-f), and which are laterally movable relative to each other for a variable tool spacing. A lateral setting device (15a, 15b) positions a first and laterally outermost frame segment. A first pull rod (16a, 16d), operable between the first and a second frame segment, pulls the second segment laterally outwardly when the first segment is moved laterally outwardly and presents at least two axially spaced abutment surfaces (1641, 1651) engaging the second frame segment. The abutment surfaces are angularly spaced apart about the longitudinal axis, such that different angular positions of the first pull rod correspond to different lateral spacings of the frame segments. A corresponding method of setting the lateral spacing is also disclosed.

Description

[0001] AGRICULTURAL IMPLEMENTS AND METHODS OF SETTING LATERAL TOOL SPACING OF AN AGRICULTURAL IMPLEMENT

[0002] Technical field

[0003] The present disclosure relates to agricultural implements for working soil, which have a variable lateral spacing between tools.

[0004] The disclosure finds particular application on seeders or planters, for which the spacing between output units or row units may be variable between two or more different predetermined spacings.

[0005] However, the principles disclosed herein may be used also for other types of agricultural implements where a variable lateral spacing between tools is desirable, including harrows and cultivators, and in particular agricultural implements carrying tools that are to operate at predetermined lateral positions, such as weeding tools or haulm toppers.

[0006] Background

[0007] It is known from e.g. W02008024760A2 and CN211960017U to provide a planter having variable spacing between row units. However, these arrangements are complex and costly to produce due to the multitude of actuators needed.

[0008] It is desirable to provide agricultural implements which can provide variable tool spacings, which can be operated in a reliable and user-friendly manner, and in particular, which can be operated with a minimum of manual interaction. Moreover, it is desirable to provide such agricultural implements which can be produced at a lower cost.

[0009] Hence, there is a need for further improvements to agricultural implements.

[0010] Summary

[0011] It is an objective of the present disclosure to provide an improved agricultural implement with a laterally variable tool spacing, and in particular an agricultural implement which is reliable and user-friendly.

[0012] The invention is defined by the appended independent claims. Embodiments are set forth in the appended dependent claims, in the following description and on the attached drawings. According to a first aspect, there is provided an agricultural implement, comprising an implement frame, having at least one laterally extending frame section, which extends transversely relative to a working direction of the agricultural implement, wherein the laterally extending frame section comprises a first set of frame segments comprising at least two frame segments, which each supports at least one soil working tool, and which are laterally movable relative to each other, such that a lateral tool spacing of the agricultural implement is variable, a lateral setting device operably connected to a first one of the frame segments, which is positionable as a laterally outermost one of the frame segments, for setting a lateral position of said first one of the frame segments, a first pull rod, which is operable between the first frame segment and a second one of the frame segments, to pull the second one of the frame segments laterally outwardly when the first one of the frame segments is caused to move laterally outwardly, wherein the first pull rod presents at least two axially, along a longitudinal axis of the first pull rod, spaced apart abutment surfaces for engaging the second one of the frame segments, wherein the abutment surfaces are angularly spaced apart about the longitudinal axis, such that different angular positions of the first pull rod correspond to different lateral spacings of the frame segments.

[0013] The laterally extending frame section may be any frame section that extends laterally, such as horizontally and in particular substantially perpendicular to, the working direction of the agricultural implement. In particular, the laterally extending frame section may be formed by essentially a single beam or by a 2D arrangement of beams.

[0014] A frame segment may be any part of the implement frame that carries one or more soil working tools. For example, a frame segment may be designed as a carriage or other member that is slidable along the laterally extending frame section. As another example, a frame segment may be designed as a member that is slidingly connected to the laterally extending frame section, such as in a telescoping manner.

[0015] The lateral setting device may be an actuator, such as a linear actuator, such as a hydraulic actuator, a pneumatic actuator or an electric actuator. Alternatively, the lateral setting device may be a manually operated device, such as a threaded axle, or the like. The pull rod may be designed with two or more abutment surfaces, which can alternatingly engage the second frame segment. For example, a first abutment surface may be provided near a first end portion of the pull rod, while one or more further abutment surfaces may be longitudinally spaced from the first abutment surface.

[0016] The first abutment surface may present a substantially annular shape, while further abutment surfaces may be provided on protrusions, steps or tongues with limited circumferential extent.

[0017] At a second end portion of the pull rod, there may be provided a connector for connecting the pull rod to the first frame segment in a laterally fixed manner.

[0018] The arrangement of an lateral setting device and at least one pull rod which defines the spacing provides for a robust solution, which can be manufactured at a reasonable cost, since the number of actuators can be kept low.

[0019] The concept can be used on an agricultural implement having a single lateral setting device, whereby all of the frame segments may be pulled in the same direction. Alternatively, as will be discussed in the following, the concept may be used on a machine having a pair of lateral setting devices, e.g. one on each side of the agricultural implement, which operate on the frame segments on their respective sides.

[0020] The agricultural implement may comprise a second set of said frame segments, arranged on a second, opposite lateral side of the agricultural implement, said second set of frame segments comprising a third frame segment and a fourth frame segment, which each supports at least one soil working tool, a second lateral setting device operably connected to the third frame segment, which is positionable as a laterally outermost one of the second set of frame segments, for setting a lateral position of said third frame segment, a second pull rod, which is operable between the third frame segment and the fourth frame segment, to pull the fourth frame segment laterally outwardly when the third frame segment is caused to move laterally outwardly, wherein the second pull rod presents at least two axially, along a longitudinal axis of the first pull rod, spaced apart abutment surfaces for engaging the second one of the frame segments, wherein the abutment surfaces are angularly spaced apart about the longitudinal axis, such that different angular positions of the second pull rod correspond to different lateral spacings of the frame segments. The agricultural implement may further comprise a third pull rod, which is operable between a laterally innermost one of the first set of frame segments and a laterally innermost one of the second set of frame segments.

[0021] The agricultural implement may further comprise a position sensor configured for detecting a lateral position of at least one of the frame segments of at least one of the sets of frame segments, in particular of a laterally innermost one of the frame segments.

[0022] There may be one position sensor provided for each laterally innermost frame segment.

[0023] The first set of frame segments may comprise a fifth frame segment, positionable laterally inwardly of the second one of the frame segments, and a fourth pull rod, operable between the second frame segment and the fifth frame segment to pull the fifth frame segment laterally outwardly when the second frame segment is caused to move laterally outwardly.

[0024] At least one of the frame segments may comprise a push rod, extending towards another one of the frame segments, which is arranged laterally inwardly, configured for defining a minimum spacing between the frame segments.

[0025] The agricultural implement may further comprise a synchronization connection, configured for providing or maintaining a predetermined angle between at least two pull rods which are laterally adjacent each other.

[0026] By laterally adjacent, it may be meant that one end portions of one of the at least two pull rods are laterally adjacent one end portion of the other of the at least two pull rods.

[0027] The synchronization connection may comprise torque transferring connections at respective longitudinal end portions of the pull rods.

[0028] At the first end portion of the pull rod, there may be provided a first part of a synchronization connector, such as a female part, which may be formed as a groove extending diametrically across the first axial end portion of the pull rod.

[0029] At the second end portion of the pull rod, there may be provided a second part of the synchronization connector, such as a male part, which may be provided as a ridge or rod extending diametrically across the second axial end portion of the pull rod. For example, a synchronization connector of a first one of the pull rods may be connectable with the synchronization connector of a second one of the pull rods only when the rods are in a predetermined axial position relative to each other.

[0030] For example, the synchronization connections may be engageable only when the agricultural implement is in the transport state, i.e. where the frame segments are fully retracted.

[0031] The agricultural implement may further comprise at least one sleeve, associated with one of the pull rods, and configured to at least partially receive, and optionally guide the movement of, the pull rod.

[0032] The sleeve may be movably connected to an associated frame segment, such that the sleeve is movable in a radial direction of the pull rod, for compensation of radial offset of the pull rod.

[0033] For example, at least one guide member may be flexibly, resiliently or spherically connected, at one of its lateral ends, to its associated frame segment, while its other end may be radially movable relative to the pull rod.

[0034] The movement of the sleeve may be a pivoting and / or a translation movement.

[0035] Hence, such radial play as may occur due to manufacturing tolerances and / or wear or loads on the agricultural implement may be compensated for.

[0036] Hence, while the pull rod may effectively engage a frame segment in a lateral direction, it may still be free to move to some degree in its radial direction.

[0037] The pull rod may be telescopically movable relative to the sleeve.

[0038] An abutment surface for interaction with the abutment surface of the associated pull rod may be formed on at least one of the frame segment and the sleeve.

[0039] The abutment surface may be formed on least one radially extending tongue.

[0040] The laterally extending frame section may comprise a fixed frame section and at least one frame segment which is laterally extendable from the fixed frame section, e.g. by being telescopically connected to the fixed frame section.

[0041] In particular, the first frame segment may be telescopically connected to the fixed frame section.

[0042] The laterally extending frame section may comprise a fixed frame section and at least one frame segment which is slidable along the fixed frame section. In particular, an outermost frame segment may be telescopically connected to the fixed frame section and one or more further frame segments may be slidable along the fixed frame section.

[0043] The agricultural implement may further comprise an anti-rotation device, configured for preventing undesired rotation between at least one of the pull rods and at least one of the frame segments.

[0044] For example, the rotation prevention device may comprise a torque limiting device connecting the pull rod to a frame segment. A torque limiting device may comprise a circumferentially extending cam surface connected to one of the frame segment and the pull rod and a cam follower which is axially biased towards the cam surface and connected to the other one of the frame segment and the pull rod.

[0045] As illustrated, the rotation prevention device may be operable between a first end portion of the pull rod and the frame segment to which this first end portion of the pull rod is laterally fixedly connected.

[0046] The lateral setting device may comprise an actuator.

[0047] According to a second aspect, there is provided a method of setting lateral tool spacing of the agricultural implement as described above, the method comprising providing the agricultural implement with the frame segments in a laterally retracted state, turning the pull rod to an angular position corresponding to a desired lateral tool spacing, providing an indication of a lateral position of at least one of the frame segments, operating the lateral setting device to cause the frame segments to move laterally until said indication indicates that the desired lateral tool spacing has been attained.

[0048] According to a third aspect, there is provided a method of setting lateral tool spacing of the agricultural implement as described above, the method comprising providing the agricultural implement with frame segments of said first and second sets of frame segments in a laterally retracted state, turning the pull rods to an angular position corresponding to a desired lateral tool spacing, receiving a first position signal indicating a lateral position of at least one of the frame segments of the first set of frame segments, operating the first lateral setting device to cause the first set of frame segments to move laterally until said first indication indicates that the desired lateral tool spacing has been attained, and subsequently operating the second lateral setting device to cause the second set of frame segments to move laterally until a desired tool spacing has been achieved between a laterally innermost frame segment of the second set of frame segments and an adjacent frame segment not forming part of the second set of frame segments.

[0049] The method may further comprise receiving a second position signal indicating a lateral position of at least one of the frame segments of the second set of frame segments, wherein the second lateral setting device comprises a second actuator which is operated until a desired position of the frame segment of the second set of frame segments been almost attained, and reducing an operating force of the second actuator for a remainder of its operation until the desired tool spacing has been attained.

[0050] Meanwhile the first actuator, if any, may be blocked so as to prevent it from imparting any lateral movement to the first set of frame segments.

[0051] The first lateral setting device may comprise a first actuator, and the second lateral setting device may comprise a second actuator, further comprising continuously operating the first actuator and / or the second actuator at the reduced operating force for causing a lateral biasing of at least some of the frame segments on the laterally extending frame section.

[0052] Meanwhile the first actuator may remain blocked so as to prevent it from imparting any lateral movement to the first set of frame segments.

[0053] In particular, since all frame segments may be interconnected by pull rods, the second actuator may provide a lateral bias for all of the frame segments.

[0054] Figs la-lb schematically illustrate an embodiment of a planter, implementing the adjustable tool spacing concept disclosed herein.

[0055] Figs 2a-2c schematically illustrate a first embodiment of the adjustable tool spacing concept disclosed herein.

[0056] Figs 3a-3c schematically illustrate a second embodiment of the adjustable tool spacing concept disclosed herein.

[0057] Figs 4a-4c schematically illustrate a third embodiment of the adjustable tool spacing concept disclosed herein.

[0058] Fig. 5 schematically illustrates another embodiment of a planter, with the tool spacing concept in a fully laterally retracted state. Fig. 6 schematically illustrates the embodiment of a planter of fig. 5 with the tool spacing concept in a fully laterally extended state.

[0059] Figs 7a-7b schematically illustrate perspective views of a pull rod.

[0060] Figs 8a-8c schematically illustrate the tool spacing concept in a fully retracted state.

[0061] Fig. 9 schematically illustrate an enlarged detail view of a stop device.

[0062] Fig. 10 schematically illustrates an enlarged detail view of an anti-rotation device.

[0063] Figs lla-llb schematically illustrate the tool spacing concept in a partly extended state.

[0064] Figs 12a-12b schematically illustrate the tool spacing concept in a fully extended state.

[0065] Fig. 13 schematically illustrates an agricultural implement

[0066] Detailed description

[0067] The adjustable tool spacing concept will be described with reference to a planter having a single row of six row units, for which row spacing can be adjusted in four steps from about 450 mm to about 750 mm.

[0068] It is understood that the present concepts may be used with agricultural implements having any number of tools in the lateral direction, and in particular agricultural implements having an even number of such tools.

[0069] However, it is understood that the number of steps, the maximum and minimum spacing, as well as the spacing between various steps can be varied as desired.

[0070] It is further understood that the adjustable tool spacing concept can be applied to other types of agricultural implements in which a variable tool spacing is desired, such as planters (precision planters), seeders (seed drills) and other agricultural implements for distributing a product to ground over which the agricultural implement travels. The adjustable tool spacing concept may also be applied to agricultural implements intended only for working soil, such as cultivators, harrows and row cleaners (weeders).

[0071] The adjustable tool spacing concept can also be applied to agricultural implements having two or more rows of tools and to agricultural implements whose frame is formed as a 2D grid or lattice of beams. In particular, the concept may be applied to agricultural implements having two or more laterally extending tool carrying frame sections.

[0072] Figs la-lb schematically illustrate an example of an agricultural implement 1 in the form of a precision planter having an implement frame 10, a traction coupling 11, here illustrated in the form of a three-point hitch. One or more ground supports 12a, 12b may be provided, in particular for providing a frame height reference. The adjustable tool spacing concept can also be applied to agricultural implements which are towed and to agricultural implements connected to, or carried by, a gantry-type traction vehicle.

[0073] Fig. 13 is a schematic diagrammatic representation of an agricultural implement, for the purposes of illustrating some components that are not visible in the other drawings. Components illustrated in fig. 13, in particular actuators 15a, 15b and position sensors 18a, 18b, are applicable to all of the embodiments disclosed herein.

[0074] The implement frame 10 comprises a laterally extending frame section 101, which supports a plurality of tools 14a, 14b, 14c, 14d, 14e, 14f, which are illustrated in the form of precision planter row units.

[0075] In the illustrated example, the tools 14a, 14b, 14c, 14d, 14e, 14f are positioned symmetrically about a central plane Pc of the agricultural implement.

[0076] Further, in the illustrated example, the laterally outermost tools 14a, 14c are positioned on laterally extendable frame sections 102a, 102b, the positions of which may be controllable by a respective lateral setting device, such as actuator 15a, 15b (fig. 13), which may be linear actuators, such as hydraulic actuators, electric actuators or pneumatic actuators. In the following description, the lateral setting device will be exemplified by actuators.

[0077] A controller 20 (fig. 13) may be provided and connected to sensors 18a, 18b and actuators 15a, 15b, such that the actuators may be controlled based on sensor signals. The controller 20 may be a specific controller for controlling only the functions described herein, or it may form part of a central controller for controlling all or most functions of the agricultural implement 1. The controller 20 may also be implemented as an external controller, which may be provided in a traction vehicle (not shown). The remaining tools 14b, 14e, 14f, 14d may be slidably arranged on a fixed part 1011 of the laterally extending frame section 101.

[0078] Each output unit is connected by a linkage (not shown) to a respective frame segment 13a, 13b, 13c, 13d, 13e, 13f, which is laterally movable relative to the fixed part 1011 of the laterally extending frame section 101.

[0079] At least some of the frame segments 13a, 13b, 13c, 13d, 13e, 13f may be movable relative to the fixed frame section 1011.

[0080] Each frame segment 13a, 13b, 13c, 13d, 13e, 13f may be formed as a base to which a tool can be connected, e.g. through a parallel linkage, as illustrated, or otherwise.

[0081] The total number of frame segments may be arbitrarily selected, from four and upwards, as desired.

[0082] In the illustrated examples, the frame segments 13a, 13b, 13c, 13d, 13e, 13f form the fixed pivots of a respective parallel linkage mechanism. However, the frame segments may be adapted for attachment of any type of tool.

[0083] The agricultural implement may comprise a first set of frame segments 13a, 13b, 13e, which may be operable on the left side of the central plane Pc and movably laterally outwardly to the left from the center plane Pc illustrated in fig. lb.

[0084] The agricultural implement may comprise a second set of frame segments 13c, 13d, 13f, which may be operable on the right side of the central plane Pc and movably laterally outwardly to the right from the center plane Pc illustrated in fig. lb.

[0085] Figs 2a-2c schematically illustrate a first version of the adjustable tool spacing concept. In this concept, the agricultural implement will have a maximum difference in width between its laterally extended and retracted states.

[0086] In particular, figs 2a-2c illustrate a left side portion of a fixed frame section 1011, which supports three tools 14a, 14b, 14e, each providing a respective trace Ra, Rb, Re of worked soil or row of distributed product when the agricultural implement 1 travels over ground that is to be worked. The traces Ra, Rb, Re are equally spaced with a first spacing SI in fig. 2a, a second, greater spacing S2 in fig. 2b and a third, even greater spacing S3 in fig. 2c. It is noted that, while figs. 2a-2c schematically illustrate only the left side of the agricultural implement, the right side may operate in the same manner, as is illustrated in fig. 13.

[0087] The tools 14a, 14b, 14e may be connected to a respective frame segment 13a, 13b, 13e, which is laterally movable relative to the fixed frame section 1011.

[0088] In the example illustrated in figs 2a-2c, a first frame segment 13a is connected to an laterally extendable telescoping section 102a of the laterally extending frame section 101, a second frame segment 13b is connected to an intermediate laterally extendable telescoping section 103a and a third frame segment 13e is arranged (fixed or laterally slidable) on the fixed frame section 1011.

[0089] A first pull rod 16a is operable between the first frame segment 13a and the second frame segment 13b by laterally fixing a first end of the pull rod 16a to the first frame segment 13a and bringing an abutment surface 1641, 1651, 1661 formed on the first pull rod 16a in contact with an abutment surface 1732 formed a stop device 1731 on the second frame segment 13b, such that a lateral outward movement of the first frame segment 13a caused by the actuator 15a causes the first pull rod 16a to laterally pull the second frame segment 13b along with the first frame segment 13a. Abutment surfaces 1641, 1651, 1661 may be formed on locking members 164, 165, 166 which may protrude from a pull rod body 161.

[0090] In a similar manner, a second pull rod 16b is laterally fixed to the second frame segment 13b and an abutment surface 1641, 1651, 1661 formed on the second pull rod 16b is brought into contact with an abutment surface 1732 formed on a stop device 1731 on the third frame segment 13e, to laterally pull the third frame segment 13e along with the second frame segment 13b.

[0091] The pull rods 16a, 16b, 16c, 16d, 16e may be arranged so as to have at least one of their ends adjacent an end of another pull rod 16a, 16b, 16c, 16d, 16e.

[0092] A distance between the portion of the pull rod 16a, 16b that is laterally fixed to the first and second frame segments 13a, 13b, respectively, and the engaged abutment surface 1641, 1651 formed on the respective pull rod 16a, 16b will then determine the resulting lateral distance between the first and second frame segments 13a, 13b and the second and third frame segments 13b, 13e, respectively.

[0093] By forming the pull rods 16a, 16b with two or more abutment surfaces 1641, 1651, which are spaced apart along the longitudinal axis Lp of the pull rods 16a, 16b, which corresponds to the lateral direction of the agricultural implement 1, and selecting which one of the abutment surfaces 1641, 1651, 1661 that is allowed to engage the abutment surface 1732 formed on the frame segment 13b, 13e, it is possible to select different row spacings SI, S2, S3.

[0094] By positioning at least some of the abutment surfaces 1641, 1651, 1661 spaced apart both longitudinally along the length of the pull rod 16a, 16b, 16e and angularly spaced apart about a longitudinal axis Lp of the pull rod 16a, 16b, 16e, and by causing the abutment surface 1732 formed on the frame segment to have an angularly limited extent, it is possible to cause the abutment surface 1732 formed on the frame segment to engage one of the abutment surfaces 1641, 1651, 1661 in dependence on a pivotal position of the pull rod 16a, 16b, 16e about its longitudinal axis Lp.

[0095] Hence, when the agricultural implement is in its fully retracted state (fig. 2a), the row spacing S2, S2, S3 can be selected by simply pivoting the pull rod(s) 16a, 16b, 16e about their longitudinal axes to an angular position corresponding to the desired row spacing and then operating the actuator 15a, 15b to laterally displace the outermost frame segment 13a, which will then cause all other frame segments 13b, 13e connected by pull rods 16a, 16b to follow.

[0096] Fig. 2b illustrates the agricultural implement in an intermediary laterally extended state, where a row spacing S2 corresponding to the one of the abutment surfaces positioned on a locking member 165 has been selected and achieved.

[0097] Fig. 2c illustrates the agricultural implement in a fully laterally extended state, where a row spacing corresponding to the one of the abutment surfaces positioned on a locking member 164 has been selected and achieved.

[0098] Figs 3a-3c schematically illustrate an alternative way of implementing the laterally variable row spacing provided in figs 2a-2c. In this concept, the agricultural implement will have a fixed width, but adjustable row spacing.

[0099] It is noted that, while figs. 3a-3c schematically illustrate only the left side of the agricultural implement, the right side may operate in the same manner, as is clear from fig. 13.

[0100] In figs 3a-3c, the frame segments 13a, 13b, 13e are all slidably arranged relative to a fixed frame section 1011, and provided with pull rods 16a, 16b in the exact same manner and with the exact same function as described with reference to figs 2a-2c.

[0101] In particular, the frame segments 13a, 13b, 13e may be slidably connected along an edge portion of the fixed frame section 1011. Such slidable connection can be achieved, e.g., using one or more rails mounted to the fixed frame section 1011, which the frame segments 13a, 13b, 13e can engage, or by providing the fixed frame section 1011 with a profile that can be engaged by the frame segments 13a, 13b, 13e.

[0102] Hence, fig. 3a illustrates the agricultural implement 1 in a first state with the row spacing SI, which is the smallest row spacing; fig. 3b illustrates the agricultural implement 1 in a second state with an intermediate row spacing S2 and fig. 3c illustrates the agricultural implement in a third state with the greatest row spacing S3.

[0103] Figs 4a-4c illustrate a way of implementing the laterally variable row spacing, which is a hybrid of the disclosure of figs 2a-2c and figs 3a-3c, in that two of the frame segments 13b, 13e are slidably connected to the fixed frame section 1011 in the manner illustrated in figs 3a-3c, while one of the frame segments 13a is connected to laterally extendable section 102a forming part of the laterally extending frame section 101, as illustrated in figs 2a-2c. Hence, in this concept, the agricultural implement will be a compromise between the variability in width of the concept illustrated in figs 2a-2c and the simplicity of the concept illustrated in figs 3a-3c.

[0104] It is noted that, while figs. 4a-4c schematically illustrate only the left side of the agricultural implement, the right side may operate in the same manner, as is clear from fig. 13.

[0105] However, the tool spacing concept may be designed and operate in the exact same manner as disclosed with reference to figs 2a-2c.

[0106] The description will now focus on details of an implementation of the variable tool spacing concept. These details may be implemented in any of the variants disclosed in figs 2a-2c, figs 3a-3c and figs 4a-4c.

[0107] Figs 5 and 6 schematically discloses the agricultural implement 1 of figs la- lb, which is configured in accordance with the principles disclosed in figs 4a-4c, in a state where only one of the tools 14a is attached to its frame segment 13a. The remaining frame segments 13b, 13e, 13f, 13d, 13c are, for illustration purposes, "empty" in the sense that no tool is attached thereto.

[0108] In fig. 5, the agricultural implement 1 is illustrated in its fully laterally retracted state, i.e. the state which provides the smallest row spacing SI.

[0109] In fig. 6, the agricultural implement 1 is illustrated in its fully laterally extended state, i.e. the state which provides the greatest row spacing S3.

[0110] Figs 7a-7b are schematic perspective views of a pull rod 16, which may constitute the pull rod 16a, 16b, 16c, 16d, 16e used in the various embodiments illustrated herein.

[0111] The pull rod 16 comprises a rod body 161, which may be formed from an elongate rod or tube, which may have a generally cylindrical cross section and which may extend along a pull rod axis Lp. The pull rod axis Lp is typically arranged horizontally and transversely of the working direction Dw of the agricultural implement 1.

[0112] At a first end of the rod body 161, there may be provided a first end portion 162, which provides a first syncronization connector 1622. Optionally, the end portion 162 may also provide an abutment surface 1621.

[0113] In the non-limiting illustrated embodiment, the first end portion 162 may be provided as a cylindrical portion having a greater diameter than the rod body 161, such that the abutment surface 1621 is formed by a radial step such that the abutment surface 1621 may be essentially annular and faces axially towards the second end portion 163.

[0114] The first syncronization connector 1622 may, as a non-limiting example, be designed as a diametrically extending slot, which may have a tapering opening portion for facilitating engagement with a second end portion 163 of an adjacent pull rod 16.

[0115] At a second end of the rod body 161, there may be provided a second end portion 163, which may comprise a second syncronization connector 1631, that is adapted for engaging the first syncronization connector 1622 of an adjacent pull rod 16 to provide a synchronization connection.

[0116] The second syncronization connector 1631 may, as a non-limiting example, be designed as a diametrically extending ridge or rod. A tapering tip may be provided for facilitating engagement with the first end portion 162 of the adjacent pull rod 16.

[0117] At the second end of the body 161, a frame segment connector 1632 may be provided. This frame segment connector may be configured to connect the pull rod 16 to the adjacent frame segment 13a, 13b, 13c, 13d, 13e, 13f such that the pull rod 16 can rotate freely relative to the frame segment while being locked in both directions laterally of the frame segment 13a, 13b, 13c, 13d, 13e, 13f, i.e. in the direction of the axis Lp. In the illustrated example, the frame segment connector is designed as a disc.

[0118] Along the rod body 161, there may be provided one or more locking members 164, 165, 166, each of which providing a respective abutment surface 1641, 1651, 1661 facing axially towards the second end portion 163.

[0119] The locking members 164, 165, 166 may be provided by separate components which are attached to the rod body 161. Alternatively, the rod body may be formed from a tubular material, whereby the locking members may be formed as tongues, which are bent radially outwardly from the rod body 161.

[0120] The locking members 164, 165, 166 may be formed such that each locking member comprises portions on diametrically opposite sides of the pull rod, as illustrated.

[0121] In the illustrated embodiments, each of the locking members 164, 165, 166 is formed as a locking member body which is arranged in a cutout that extends diametrically through the rod body 161, such that the locking member body protrudes on diametrically opposite sides of the pull rod to provide a pair of abutment surfaces which are diametrically aligned.

[0122] The number of locking members 164, 165, 166 provided can be selected depending on how many different row spacings are to be provided for. The position of each locking member 164, 165, 166 along the rod body 161 is selected with regard to the corresponding row spacing that is to be provided.

[0123] The locking members 164, 165, 166 are configured such that the abutment surfaces 1641, 1651, 1661 are angularly spaced about the longitudinal axis Lp. The angular offset between longitudinally spaced apart abutment surfaces 1641, 1651, 1661 may be on the order of 20-50 degs, preferably about 30-40 degs or about 35 degs. The rod body 161 may further be prepared for mounting of an anti-rotation device 167 (figs 8c, 10). To this end, fastener attachments 1611, 1612 may be provided, such as holes or recesses for receiving one or more fasteners.

[0124] Figs 8a-8b schematically illustrate the laterally extending frame section 101 and two of the frame segments 13b, 13e attached to the laterally extending frame section 101. In figs. 8a-8c, the agricultural implement 1 is illustrated in its retracted state, i.e. the state with the smallest row spacing.

[0125] Fig. 8c is a schematic partially sectional view, illustrating two of the frame segments 13e, 13f and part of the frame segment 13b. Also illustrated in fig. 8c are the pull rods 16a, 16c, 16e, 16d, each of which may be desiged as illustrated in figs 7a-7b.

[0126] The pull rod 16a is laterally retracted into the frame segment 13b, the pull rod 16c is laterally retracted into the frame segment 13e and the pull rod 16e is laterally retracted into the frame segment 13f.

[0127] In this state, the first end portion 162 of the pull rod 16a engages the second end portion 163 of the pull rod 16c, the first end portion 162 of the pull rod 16c engages the second end portion 163 of the pull rod 16e and the first end portion 162 of the pull rod 16e engages the second end portion 163 of the pull rod 16d. Hence, the pull rods 16a, 16b, 16c, 16d, 16e are connected such that they can be jointly rotated about the common axis Lp.

[0128] The second end portion of each of the pull rods 16a, 16b, 16c, 16d, 16e will be laterally locked to its adjacent frame segment 13a, 13b, 13c, 13d, 13e, 13f. Hence, referring to figs 5 and 6, the first pull rod 16a may be laterally locked to the frame segment 13a, the second pull rod 16b may be laterally locked to the frame segment 13d, the third pull rod 16c may be laterally locked to the frame segment 13b, the fourth pull rod 16d may be laterally locked ot the frame segment 13f and the fifth pull rod 16e may be laterally locked to the frame segment 13e. With the locking being only lateral, the locking does not prevent the pull rods 16a, 16b, 16c, 16d, 16e from being rotated about the axis Lp.

[0129] The lateral locking may be provided by axially enclosing the frame segment connector 1632 between a pair of plates which may be fixedly connected to the frame segment 13, while providing a sufficient play between the plates and the frame segment connector 1632. For engagement with the abutment surfaces 1621, 1641, 1651, 1661, a stop device 1731 (fig. 9) may be provided, which may be laterally fixed relative to the frame segment 13. This stop device 1731 may be configured to provide angularly selective locking. One way of achieving this is to provide an opening in a lateral wall 132 of the frame member 13, for receiving the pull rod 16a, 16b, 16c, 16d, 16e, with one or more radially extending tongues. In the illustrated examples, there are provided two radially inwardly extending tongues, which are diametrically oppositely arranged. Each of the radial tongues may have an angular extent about the longitudinal axis Lp of about 20-50 degs, preferably about 30-40 degs or about 35 degs.

[0130] Hence, the stop device 1731 will provide one or more abutment surfaces 1732 which may engage one (or a pair) of the abutment surfaces 1621, 1641, 1651, 1661 depending on the relative angle between the pull rod 16 and the stop device 1731 about the axis Lp, such that different relative angular positions of the stop device 1731 and the pull rod 16 correspond to different relative lateral positions of of the stop device 1731 and the pull rod 16.

[0131] If it is desired to manage potential lateral misalignment of the pull rods 16a, 16b, 16c, 16d, 16e, which may occur due to manufacturing tolerances, wear or load variations, it is possible to provide sleeves 17, each of which being radially (relative to the axis Lp) movably connected to a respective one of the frame segments 13a, 13b, 13c, 13d, 13e, 13f.

[0132] Referring to fig. 8c, the sleeves 17 may be formed with a tubular body 171 having a first sleeve end 172 and a second sleeve end 173.

[0133] The first sleeve end 172 may be connected to a first wall 131 of the frame segment 13 such that the sleeve 17 can be slightly radially and / or angularly offset from the axis Lp of the pivot rods 16a, 16b, 16c, 16d, 16e. For example, the sleeve 17 may be mounted to the first wall 131 using flexible and / or resilient fasteners and / or using one or more flexible and / or resilient intermediate holders. Alternatively, the sleeve 17 may be mounted with some radial and / or axial play that allows for a limited relative movement between the sleeve and the frame segment 13. At the second wall 132 of the frame segment, the first sleeve may merely pass through this wall, optionally with a cover plate covering an annular gap provided between the outside of the sleeve and the edge of the hole through the second wall 132. In fig. 8c, the pull rod 16b is retracted into a sleeve 17, which is connected to the frame segment 13b. The pull rod 16c is retracted into a sleeve 17, which is connected to the frame segment 13e. The pull rod 16e is retracted into a sleeve 17, which is connected to the frame segment 13f.

[0134] When the frame segments 13a, 13b, 13c, 13d, 13e, 13f and the pull rods 16a, 16b, 16c, 16d, 16e are in the state illustrated in fig. 8c, it is possible to jointly turn all of the pull rods 16a, 16b, 16c, 16d, 16e by means of a pull rod setting device 30 (fig. 13), which may take the form of e.g. a knob (not shown), a lever (not shown) and / or an actuator (not shown), which may be connected to the controller 20, such that each abutment surface 1641, 1651, 1661 is angularly aligned about the axis Lp with the corresponding abutment surface of the other pull rods 16a, 16b, 16c, 16d, 16e. When connected to a controller 20, the setting of the angular position of the pull rods 16a, 16b, 16c, 16d, 16e may be controlled remotely and without any manual interaction.

[0135] A manual pull rod setting device may be provided with a dial or the like indicating the various angular positions. An automated pull rod setting device (i.e. one with an actuator) may be provided with an angle sensor for detecting a current angular position and providing a corresponding signal to the controller 20.

[0136] With the stop devices 1731 also being angularly aligned about the axis Lp, it is understood that, when moved laterally outwardly, each pair of adjacent frame sections 13a, 13b, 13c, 13d, 13e, 13f will become spaced apart by the same distance, as the various abutment surfaces 1621, 1641, 1651, 1661 engage the various stop devices 1731.

[0137] Referring to fig. 10, there is provided an enlarged view of an anti-rotation device 167, which may be provided for preventing the pull rods 16a, 16b, 16c, 16d, 16e from undesirably rotating, e.g. because of vibrations or erroneous maneuvering. Such undesirable rotation of one or more of the pull rods may lead to misalignment, which could cause the adjustable tool spacing concept to malfunction.

[0138] An anti-rotation device 167 is operable between at least one, preferably all, of the pull rods 16a, 16b, 16c, 16d, 16e and the frame section 13a, 13b, 13c, 13d, 13e, 13f to which the second end portion 163 of each pull rod is connected. In particular, the anti-rotation device 167 may be operable between the first sleeve end 172 of the respective sleeve 17 and the second end portion 163 of the respective pull rod 16a, 16b, 16c, 16d, 16e.

[0139] The anti-rotation device 167 may comprise a torque limiting arrangement, which effectively prevents rotation between the pull rod 16a, 16b, 16c, 16d, 16e and the frame section 13a, 13b, 13c, 13d, 13e, 13f until a sufficiently large torque is being applied. Hence, such torques as are generated by vibrations etc. can be prevented from causing the pull rod to rotate, while such torques as are deliberately applied, e.g. manually or by an actuator, may cause the pull rod to rotate.

[0140] In the non-limiting disclosed example, the anti-rotation device 167 comprises a pair of torque limiter members 1671, 1672, which interact via a pair of axially undulating ("wavy") surfaces that engage with each other. The torque limiter members 1671, 1672 may be axially biased towards each other by a spring 1673, which may operate against an axial counterhold 1674. The counterhold may be axially locked relative to the pull rod 16 by a fastener 1675, such as a pin, which may engage one of the fastener attachments 1611, 1612. The movable one of the torque limiter members 1671 may be axially guided and limited by another fastener 1676, which may engage one of the fastener attachments 1611, 1612. The fastener 1676 may engage an axially elongate recess in the wall of the torque limiter member

[0141] 1671, such that the torque limiter member 1671 can move axially along the pull rod 16 within a limited range and such that the torque limiter member 1671 is non- rotatable relative to the pull rod 16.

[0142] Hence, when the frame sections 13a, 13b, 13c, 13d, 13e, 13f are in the state illustrated in figs 8a-8c, it is possibly to jointly rotate all of the pull rods 16a, 16b, 16c, 16d, 16e to a desired angular position about the axis Lp, provided a sufficient torque is applied to overcome the torque limiting effect provided by the antirotation devices 167.

[0143] The number of engagement positions of the torque limiter members 1671,

[0144] 1672, as well as the angular positions of such engagement positions, may correspond to the angular positions of the pull rods 16a, 16b, 16c, 16d, 16e, 16f associated with various row spacings. Referring to figs lla-llb, there is illustrated the tool spacing concept in a partly extended state, wherein each of the locking members 165 engages a respective one of the stop devices 1731. To obtain this partly extended state, starting from the state illustrated in figs 8a-8c, the pull rods 16a, 16b, 16c, 16d, 16e would have been jointly turned to such an angle about the axis Lp that the locking members 165 will align with the tongues of the stop devices 1731.

[0145] Subsequently, the actuator 15a (figs 2a-4c) is operated to push the laterally outermost one 13a of the frame segments on the left (or right, as the case may be) side of the agricultural implement 1, whereby the first pull rod 16a, which is laterally fixed to the first frame segment 13a, will be pulled out of the sleeve 17 of the second frame segment 13b until its locking member 165 engages the stop device 1731 provided on the second frame segment 13b, whereupon the second frame segment 13b is also pulled laterally outwardly.

[0146] The same will take place between the second frame segment 13b and its adjacent frame segment 13e. A position sensor 18, 18a, 18b (fig. 13) may be provided for detecting the position of the laterally innermost frame segment 13e, 13f. Based on a signal from the position sensor 18, 18a, 18b (fig. 13), it can be determined when the innermost frame segment 13e, 13f has reached the desired lateral position, at which point the operation of the actuator 15a may be stopped. The actuator 15a may at this stage be "locked", i.e. prevented from moving further. Such locking can be achieved by mechanically blocking the actuator 15a and / or by closing valves feeding hydraulic / pneumatic fluid to the actuator. In the case of an electric actuator, mechanic blocking or switching off power supply can be used.

[0147] At this point, a second actuator 15b, which is operable towards the other side of the agricultural implement 1, and in particular towards the outermost frame segment 13c on that side of the agricultural implement will be operated.

[0148] The second actuator 15b may be operated until the desired lateral position has been reached of the second innermost frame segment 13f, at which position it may be locked.

[0149] Alternatively, one or both actuators 15a, 15b (fig. 13) may be used to laterally bias the entire row of frame segments 13a, 13b, 13c, 13d, 13e, 13f by maintaining a small lateral force onto the row of frame segments 13a, 13b, 13c, 13d, 13e, 13f, rather than being locked. Alternatively, a biasing element (not shown) may be provided, whereby the actuators 15a, 15b are operated until this biasing element is partly compressed, after which both actuators may be locked.

[0150] When operating the second one of the actuators, it may be desirable to operate this at its normal force until the desired position of the laterally innermost frame segment 13f has almost been attained, as per a signal form a second position sensor 18b (fig. 13), after which the force provided on the second actuator may be reduced, and operation continued until the final position is reached. Alternatively, from the detection by the second position sensor 18b, the force may be reduced and then maintained as the biasing force.

[0151] Hence, while the lateral position of the innermost one (here: the third) 13e of the first set of frame segments 13a, 13b, 13e is fixed by the first actuator 15a, which cooperates with the first and second frame segments 13a, 13b and the first and second pull rods 16a, 16b to move the innermost one 13e of the first set of frame segments to its intended lateral position, the lateral position of the innermost one (here: the sixth) 13f of the second set of frame segments will be provided by the second actuator 15b, which cooperates with the fourth and fifth frame segments 13c, 13d and the third and fourth pull rods 16c, 16d to pull the sixth frame segment laterally outwardly until its lateral movement is blocked by the fifth pull rod 16e, which acts between the third and sixth frame segments 13e, 13f. Referring to figs 12a-12b, there is illustrated the tool spacing concept in a fully extended state, wherein each of the abutment surfaces 1621 first end portions 162 of the pull rods engages a respective one of the stop devices 1731.

[0152] Operation of the tool spacing concept to attain the fully extended state illustrated in figs 12a-12b is the same as that to obtain the partly extended state illustrated in figs lla-llb, apart from the fact that a different angular position of the pull rods 16a, 16b, 16c, 16d, 16e about the axis Lp was set when the agricultural implement was in the fully retracted state illustrated in figs 8a-8c. In particular, the fully extended state may be achieved when the abutment surface 1621 provided at the first end portion of each of the pull rods is caused to engage with the abutment surfaces 1732 on the stop devices 1731.

[0153] Hence, according to this implementation, joint setting of the angular position of the pull rods 16a, 16b, 16c, 16d, 16e is preferably only possible while the agricultural implement is in the fully retracted state illustrated in figs 8a-8c, as this is the only position in which the synchronization connectors 1622, 1631 are in engagement with each other to provide the synchronization connection.

[0154] It is understood that, in the present implementation, the laterally outermost frame segment 13a on the left side of the agricultural implement will only be adapted for interaction with the second end portion 163 of the pull rod 16a. Likewise, the laterally outermost frame segment 13c on the right side of the agricultural implement will only be adapted for interaction with the first end portion 162 of the pull rod 16b.

[0155] The pull rod setting device 30 may be provided at either side of the agricultural implement.

[0156] In order to return the agricultural implement to its fully retracted state, the actuators 15a, 15b are operated to laterally withdraw the outermost frame segments 13a, 13c.

[0157] A push rod 19 positioned on one at least some of the frame segment 13a, 13b, 13c, 13d, 13e, 13f may be provided in order to limit the lateral movement of the frame segments 13a, 13b; 13b, 13e towards each other.

[0158] On the left side of the illustrated agricultural implement, the actuator 15a will withdraw the first frame segment 13a, to which the first pull rod 16a is axially fixed, whereby the first pull rod 16a is withdrawn into a sleeve 17 associated with the second frame segment 13b until the first end portion 162 of the first pull rod 16a engages the second end portion 163 of the second pull rod 16c. Subsequently, the second frame segment 13b will be pushed laterally inwardly whereby the third pull rod 16c is withdrawn into the fifth frame segment 16e.

[0159] Pull rods 19 operable between the first and second frame segments 13a, 13b; between the third and fourth frame segments 13c, 13d, as well as between the second and fifth frame segments 13b, 13e and between the fourth and sixth frame segments 13d, 13f may be used to transfer the force from the actuator 15a, 15b so as to push the frame segments inwardly.

[0160] Stop devices (not shown), such as protrusions or the like, may be provided for mechanically limiting the laterally inward movements of the innermost (fifth and sixth) frame segments 13e, 13f. On the right side of the implement, the actuator 15b will withdraw the frame segment 13c, whereby the pull rod 16b is withdrawn into the frame segment 13c.

[0161] Correspondingly, the pull rod 16d is withdrawn into the frame segment 13d and the pull rod 16e is withdrawn into frame segment 16f.

[0162] Push rods 19 may be provided between frame segments 13c and 13d and between frame segments 13d and 13f.

[0163] The push rods 19 may be used to cause outer frame segments 13a, 13b; 13c, 13d to engage inner frame segments 13b, 13e; 13d, 13f before the pull rods have been completely retracted into the respective frame segment.

[0164] The concepts disclosed above can, with some modification, be used also with an agricultural implement having an odd number of tools in the lateral direction. In such case, a one of the tools, such as a central one, may be fixedly mounted to the laterally extending frame section and used as a reference tool, while the other tools are provided with pull rods as disclosed above. In such a design, the position sensor may be dispensed with.

[0165] It is further contemplated that, in certain embodiments, the actuators 15a, 15b may be replaced with a manual lateral setting device, e.g. a threaded axle, which may be actuated by a lever or by an external drive motor, such as a hand-held drill, whereby that the lateral adjustment of the frame segments may be performed manually.

[0166] In such embodiments, the position sensor(s) 18a, 18b may be replaced with an indicator scale and / or a mechanical limiter device that indicates or limits the movement of the innermost frame section(s) 13e, 13f.

Claims

CLAIMS1. An agricultural implement, comprising: an implement frame (10), having at least one laterally extending frame section (101), which extends transversely relative to a working direction (Dw) of the agricultural implement (1), wherein the laterally extending frame section (101) comprises a first set of frame segments (13a, 13b, 13e; 13c, 13d, 13f) comprising at least two frame segments, which each supports at least one soil working tool (14a, 14b, 14c, 14d, 14e, 14f), and which are laterally movable relative to each other, such that a lateral tool spacing of the agricultural implement (1) is variable, a lateral setting device (15a, 15b) operably connected to a first one of the frame segments (13a, 13c), which is positionable as a laterally outermost one of the frame segments, for setting a lateral position of said first one of the frame segments (13a, 13c), a first pull rod (16a, 16b), which is operable between the first frame segment (13a, 13c) and a second one (13b, 13d) of the frame segments, to pull the second one (13b, 13d) of the frame segments laterally outwardly when the first one (13a, 13c) of the frame segments is caused to move laterally outwardly, wherein the first pull rod (16a, 16b) presents at least two axially, along a longitudinal axis of the first pull rod, spaced apart abutment surfaces (1641, 1651, 1661) for engaging the second one of the frame segments (13b, 13d), wherein the abutment surfaces (1641, 1651, 1661) are angularly spaced apart about the longitudinal axis, such that different angular positions of the first pull rod (16a, 16b) correspond to different lateral spacings of the frame segments (13a, 13b; 13c, 13d).

2. The agricultural implement as claimed in claim 1, wherein the agricultural implement (1) comprises: a second set of said frame segments (13c, 13d, 13f), arranged on a second, opposite lateral side of the agricultural implement (1), said second set of framesegments comprising a third frame segment (13c, 13a) and a fourth frame segment (13d, 13b), which each supports at least one soil working tool (14c, 14d, 14f), a second lateral setting device (15b) operably connected to the third frame segment (13c), which is positionable as a laterally outermost one of the second set of frame segments, for setting a lateral position of said third frame segment (13c), a second pull rod (16b, 16a), which is operable between the third frame segment (13c) and the fourth frame segment (13d), to pull the fourth frame segment (13d) laterally outwardly when the third frame segment (13c) is caused to move laterally outwardly, wherein the second pull rod (16b) presents at least two axially, along a longitudinal axis of the first pull rod (16a), spaced apart abutment surfaces (1641, 1651, 1661) for engaging the second one of the frame segments (13d), wherein the abutment surfaces (1641, 1651, 1661) are angularly spaced apart about the longitudinal axis, such that different angular positions of the second pull rod (16b) correspond to different lateral spacings of the frame segments (13c, 13d).

3. The agricultural implement as claimed in claim 2, further comprising a third pull rod (16e), which is operable between a laterally innermost one of the first set of frame segments and a laterally innermost one of the second set of frame segments.

4. The agricultural implement as claimed in any one of the preceding claims, further comprising a position sensor (18) configured for detecting a lateral position of at least one of the frame segments of at least one of the sets of frame segments, in particular of a laterally innermost one (13e, 13f) of the frame segments.

5. The agricultural implement as claimed in any one of the preceding claims, wherein the first set of frame segments comprises a fifth frame segment (13e, 13f), positionable laterally inwardly of the second one (13b, 13d) of the frame segments, anda fourth pull rod (16c, 16d), operable between the second frame segment (13b, 13d) and the fifth frame segment (13e, 13f) to pull the fifth frame segment (13e, 13f) laterally outwardly when the second frame segment (13b, 13d) is caused to move laterally outwardly.

6. The agricultural implement as claimed in any one of the preceding claims, wherein at least one of the frame segments (13a, 13b, 13c, 13d, 13e, 13f) comprises a push rod (19), extending towards another one of the frame segments, which is arranged laterally inwardly, configured for defining a minimum spacing between the frame segments (13a, 13b, 13c, 13d, 13e, 13f).

7. The agricultural implement as claimed in any one of the preceding claims, further comprising a synchronization connection (1631, 1622), configured for providing a predetermined angle between at least two pull rods (16a, 16b, 16c, 16d, 16e) which are laterally adjacent each other.

8. The agricultural implement as claimed in claim 7, wherein a synchronization connector (1631, 1622) of a first one of the pull rods is connectable with the synchronization connector of a second one of the pull rods only when the rods are in a predetermined axial position relative to each other.

9. The agricultural implement as claimed in any one of the preceding claims, further comprising at least one sleeve (17), associated with one of the pull rods (16a, 16b, 16c, 16d, 16e), and configured to at least partially receive, and optionally guide the movement of the pull rod (16a, 16b, 16c, 16d, 16e).

10. The agricultural implement as claimed in claim 9, wherein the sleeve (17) is movably connected to an associated frame segment (13b, 13c, 13d, 13e, 13f), such that the sleeve is movable in a radial direction of the pull rod (16a, 16b, 16c, 16d, 16e), for compensation of radial offset of the pull rod.

11. The agricultural implement as claimed in claim 9 or 10, wherein the pull rod (16a, 16b, 16c, 16d, 16e) is telescopically movable relative to the sleeve(17).

12. The agricultural implement as claimed in any one of claims 9-11, wherein an abutment surface (1732) for interaction with the abutment surface (1621, 1641, 1651, 1661) of the associated pull rod (16a, 16b, 16c, 16d, 16e) is formed on at least one of the frame segment (13a, 13b, 13c, 13d, 13e, 13f) and the sleeve (17).

13. The agricultural implement as claimed in claim 12, wherein the abutment surface (1732) is formed on least one radially extending tongue.

14. The agricultural implement as claimed in any one of the preceding claims, wherein the laterally extending frame section (101) comprises a fixed frame section (1011) and at least one frame segment (102a, 102b, 103a) which is laterally extendable from the fixed frame section (1011), e.g. by being telescopically connected to the fixed frame section (1011).

15. The agricultural implement as claimed in any one of the preceding claims, wherein the laterally extending frame section (101) comprises a fixed frame section (1011) and at least one frame segment (13a, 13b, 13c, 13d, 13e, 13f) which is slidable along the fixed frame section (1011).

16. The agricultural implement as claimed in any one of the preceding claims, further comprising an anti-rotation device (167), configured for preventing undesired rotation between at least one of the pull rods (16a, 16b, 16c, 16d, 16e) and at least one of the frame segments (13a, 13b, 13c, 13d, 13e, 13f).

17. The agricultural implement as claimed in any one of the preceding claims, wherein the lateral setting device comprises an actuator (15a, 15b).

18. A method of setting lateral tool spacing of the agricultural implement as claimed in any one of the preceding claims, the method comprising: providing the agricultural implement with the frame segments (13a, 13b, 13c, 13d, 13e, 13f) in a laterally retracted state, turning the pull rod (16a, 16b, 16c, 16d, 16e) to an angular position corresponding to a desired lateral tool spacing, providing an indication of a lateral position of at least one of the frame segments (13a, 13b, 13c, 13d, 13e, 13f), operating the lateral setting device (15a, 15b) to cause the frame segments (13a, 13b, 13c, 13d, 13e, 13f) to move laterally until said indication indicates that the desired lateral tool spacing has been attained.

19. A method of setting lateral tool spacing of the agricultural implement as claimed in any one of claims 1-17 in conjunction with claim 2, the method comprising: providing the agricultural implement with frame segments (13a, 13b, 13c, 13d, 13e, 13f) of said first and second sets of frame segments in a laterally retracted state, turning the pull rods (16a, 16b, 16c, 16d, 16e) to an angular position corresponding to a desired lateral tool spacing, receiving a first position signal indicating a lateral position of at least one of the frame segments (13a, 13b, 13e; 13c, 13d, 13f) of the first set of frame segments, operating the first lateral setting device (15a, 15b) to cause the first set of frame segments (13a, 13b, 13e; 13c, 13d, 13f) to move laterally until said first indication indicates that the desired lateral tool spacing has been attained, and subsequently operating the second lateral setting device (15b, 15a) to cause the second set of frame segments (13c, 13d, 13f; 13a, 13b, 13e) to move laterally until a desired tool spacing has been achieved between a laterally innermost frame segment (13f, 13e) of the second set of frame segments and an adjacent frame segment (13e, 13f) not forming part of the second set of frame segments.

20. The method as claimed in claim 19, further comprising receiving a second position signal indicating a lateral position of at least one of the frame segments of the second set of frame segments (13c, 13d, 13f; 13a, 13b, 13e), wherein the second lateral setting device comprises a second actuator (15b, 15a) which is operated until a desired position of the frame segment of the second set of frame segments (13c, 13d, 13f; 13a, 13b, 13e) been almost attained, and reducing an operating force of the second actuator (15b, 15a) for a remainder of its operation until the desired tool spacing has been attained.

21. The method as claimed in claim 19 or 20, wherein the first lateral setting device comprises a first actuator, and the second lateral setting device comprises a second actuator, further comprising continuously operating the first actuator and / or the second actuator (15b, 15a) at the reduced operating force for causing a lateral biasing of at least some of the frame segments (13a, 13b, 13c, 13d, 13e, 13f) on the laterally extending frame section (101).

Images