Agricultural implement

Abstract

The present invention relates to an agricultural implement, in particular for soil tillage, comprising: an implement frame comprising a base frame and at least one tool frame, wherein the tool frame is arranged on the base frame so as to be foldable about a folding axis, in particular laterally with respect to the base frame, and so as to be pivotable about a pivot axis, in particular in an implement longitudinal direction; an actuator system arranged on the implement frame for moving the tool frame between a working position and a transport position, wherein the actuator system comprises at least one first cylinder unit for, in particular laterally, folding the tool frame about the folding axis and a second cylinder unit for pivoting the tool frame about the pivot axis; and a hydraulics system having at least one hydraulics circuit for actuating the actuator system. According to the invention, the at least one first cylinder unit and the second cylinder unit are connected to the same hydraulic circuit, wherein the hydraulic system is designed such that the tool frame is pivoted, in particular from the working position in the direction of the transport position, about the folding axis depending on a pivot angle of the tool frame about the pivot axis.

Description

[0001] Agricultural equipment

[0002] The present invention relates to an agricultural implement and a method for soil cultivation.

[0003] A wide variety of agricultural implements are used in agricultural technology for soil cultivation and / or sowing. These implements are typically mounted or trailed on an agricultural tractor and pulled across the area to be cultivated, such as a field. A variety of tools are used for soil cultivation, including loosening, reconsolidation, and / or cutting tools. Furthermore, such agricultural implements can be equipped with components for seed application, such as seed drills and / or fertilizer application systems.

[0004] Besides the tools used, a key distinguishing feature is the working width of agricultural implements, which is sometimes many times the permissible transport widths for road use. Implements with a large working width allow for more efficient field cultivation, as fewer passes are needed to cover the area. These implements are often attached to the tractor via a frame and have their own chassis. To enable transport on public roads, various folding and collapsible mechanisms are used, allowing the implements to be reduced from their working width to a permissible transport width.Furthermore, depending on the tools used, it may be necessary to allow an adjustment of the inclination of a soil cultivation machine or seed drill, for example to adjust a working depth difference of offset working tools.

[0005] Numerous agricultural implements are known that can perform folding or adjustment functions via hydraulic cylinders. One such agricultural tillage implement is disclosed, for example, in EP 3 384 757 A1. The agricultural implement disclosed here has a multi-section frame with attached tools, which can be switched between a working position and a transport position by means of several actuators. A complex hydraulic circuit enables the synchronized movement of several frame sections when pivoting into the transport position. Adjusting the tilt of the implement or the tools relative to the ground would have to be done manually, which would be very time-consuming. Hydraulic adjustment requires additional, costly components, such as hydraulic cylinders and control units.

[0006] The object of the present invention is therefore to provide an agricultural implement which has a large working width and enables the most homogeneous cultivation of the soil while at the same time being as easy to adjust and construct as possible.

[0007] The problem is solved by an agricultural implement according to the features of claim 1 and a method according to claim 10. Advantageous embodiments of the invention are specified in the dependent claims.

[0008] The invention relates to an agricultural implement, in particular for

[0009] Soil cultivation, with a machine frame comprising a base frame and at least one tool frame, wherein the tool frame is arranged on the base frame in a way that is foldable, in particular laterally to the base frame, about a folding axis and pivotable about a pivot axis, in particular in a longitudinal direction of the machine, an actuator arranged on the machine frame for moving the tool frame between a working position and a transport position, wherein the actuator has at least a first cylinder unit for folding the tool frame about the folding axis, in particular laterally, a second cylinder unit for pivoting the tool frame about the pivot axis, and a hydraulic system with at least one hydraulic circuit for actuating the actuator.According to the invention, the at least one first cylinder unit and the second cylinder unit are connected to the same hydraulic circuit, wherein the hydraulic system is designed such that a pivoting, in particular from the working position to the transport position, of the tool frame about the folding axis takes place depending on a pivot angle of the tool frame about the pivot axis.

[0010] A implement frame, particularly its base frame, can be designed to be connected to a towing vehicle, for example, by attaching it to or mounting it on the vehicle. One or more uniform or different tools, especially for soil cultivation, can be arranged on a tool frame of the implement frame. The tools can be, for example, rollers, shares, discs, tines, or harrows. Modern implements, with appropriately wide tool frames, can achieve working widths greater than the permissible road transport width. For this purpose, the implement frame can be pivoted between a transport position and a working position. In the transport position, the tool frame can be pivoted essentially perpendicular to the ground around a pivot axis and / or a folding axis.In the working position for soil cultivation, the tool frame can be unfolded and pivoted towards the ground around the pivot axis and / or the folding axis. The pivot axis can be arranged essentially perpendicular to a working direction of the implement. The folding axis can be arranged essentially parallel to the working direction of the implement.

[0011] In the working position, the tool frame can first be pivoted into a defined, preset starting position for soil cultivation, whereby the tool frame can be aligned essentially in one plane with the base frame and / or essentially parallel to the ground, particularly a level surface. In the preset working position initially reached with the tool frame, the starting position for soil cultivation, the pivot angle between the base frame and the tool frame can be essentially zero. For soil cultivation, starting from the working position, the tilt of the tool frame relative to the base frame can be set in the form of a pivot angle. An actuator for pivoting the tool frame can comprise a first cylinder unit for pivoting about the folding axis and a second cylinder unit for pivoting about the pivot axis.The actuator can have one or more first cylinder units. The second cylinder unit can, for example, be designed as a double cylinder. The actuator can be operated by a hydraulic system, wherein, according to the invention, the first cylinder unit and the second cylinder unit can be connected to the same hydraulic circuit, thus enabling their actuation via a single hydraulic circuit. The hydraulic system is designed such that pivoting of the tool frame about the folding axis, in particular from the working position towards the transport position, occurs depending on a pivot angle of the tool frame about the pivot axis. In this context, the first cylinder unit can be locked in the hydraulic system up to an adjustable pivot angle or within a pivot angle range, thus preventing pivoting of the tool frame about the folding axis.This can occur, for example, when the tool frame is in its working position, so that when the second cylinder unit is actuated in this position, the tool frame would initially only pivot around its pivot axis. This allows the tilt of the tool or the frame to be adjusted by the second cylinder unit using only one hydraulic circuit, without the tool frame pivoting around its folding axis. Above an adjustable pivot angle, the first cylinder unit can also pivot the tool frame around its folding axis, in addition to pivoting around its pivot axis.

[0012] By connecting the first and second cylinder units to the same hydraulic circuit and locking the first cylinder unit depending on the swivel angle, especially up to an adjustable swivel angle, the limit swivel angle, it is possible to tilt the soil cultivation implement, for example to adjust the working depth difference of offset working tools, with little design effort, cost-effectively and comfortably for an operator.

[0013] In a preferred embodiment, when the tool frame is pivoted about the pivot axis between the working position and a limit pivot angle, only the tool frame pivots about the pivot axis. In particular, from the limit pivot angle onwards, in the direction of the transport position, the tool frame pivots about both the pivot axis and the folding axis. In the working position, the tool frame can be pivoted about the pivot axis to set a pivot angle.

[0014] This allows the tilt of the tool frame, particularly relative to the base frame, to be adjusted. The swivel angle, starting from the tool frame's initial position in the working position, can be less than, greater than, or equal to zero. A limit swivel angle can be greater than zero, defining the angle at which the first cylinder unit is released and can be pressurized by the hydraulic system, thus enabling the tool frame to swivel around the folding axis. A swivel angle smaller than, and especially less than or equal to, the limit swivel angle can lock the first cylinder unit, preventing the tool frame from moving around the folding axis. This swivel angle can also be less than zero.This allows for an area for tilt adjustment by the second cylinder unit in the working position, while the first cylinder unit remains stationary, even though the first and second cylinder units are connected to the same hydraulic circuit.

[0015] In a particularly preferred embodiment, the hydraulic system is designed such that, during pivoting, especially from a transport position to the working position, the tool frame is fully pivoted laterally about the folding axis before the pivoting of the tool frame into the working position about the pivot axis is complete. By appropriately designing the hydraulic lines and hydraulic cylinders, when one hydraulic circuit, and thus the first and second cylinder units, is pressurized in the transport position, the first cylinder unit extends fully before the second cylinder unit extends to the point where the limit pivot angle is reached. This has the advantage that lateral folding of the tool frame about the folding axis is completed before the limit pivot angle is reached and the first cylinder unit is locked.Preferably, the hydraulic system comprises at least one valve unit, in particular in the form of a locking valve, which is controllable depending on the pivot angle of the tool frame about the pivot axis. In the hydraulic circuit connected to the first and second cylinder units, a valve unit can be arranged such that locking of the first cylinder unit is possible. Locking of the first cylinder unit by the valve unit, in particular in the form of a locking valve, can be effected depending on a pivot angle, in particular a limit pivot angle, of the tool frame about the folding axis. This allows the first cylinder unit to be locked essentially in the working position, thereby enabling tilt adjustment by means of one hydraulic circuit and the second cylinder unit.

[0016] In a preferred embodiment, the valve unit is designed such that when the tool frame is pivoted about the pivot axis between the working position and the limit pivot angle, the first cylinder unit is locked and only the second cylinder unit is connected to the hydraulic circuit. In particular, when pivoting between the limit pivot angle and the transport position, both the first and second cylinder units are connected to the hydraulic circuit, and in particular, to the same hydraulic circuit. When pivoting from the working position to the transport position, initially only the second cylinder unit can be connected to the hydraulic circuit, i.e., fluidically connected and pressurized, whereas the first cylinder unit is locked and cannot be pressurized by the hydraulic circuit.This allows the tool frame to pivot around the pivot axis when the implement is folded, for example for road transport, before it can also pivot around the folding axis once the limit of the pivot angle is reached. This has the advantage that the tool frame has some ground clearance when being moved into the transport position before the pivoting around the folding axis can take place.

[0017] In a further preferred embodiment, the valve unit can be actuated by means of a coupling device which is mounted on the base frame side and / or on the tool frame side. A coupling device for actuating the valve unit can be mechanical, pneumatic, hydraulic and / or electrical, for example with sensors in the form of rotary angle sensors.

[0018] Preferably, the coupling device is designed in the form of a mechanical, in particular positive-locking, connection, especially in the form of at least one gear segment. A mechanical connection can be designed in the form of a simple rod which is pivotally connected to the valve unit and the tool frame and / or base frame. A simple design in the form of a cam on the base frame or tool frame side, which can act on the valve unit depending on the pivot angle, is also conceivable. A positive-locking connection with gears or gear segments can be formed by meshing gears / gear segments, wherein one gear segment can be fixed on the tool frame or base frame side and the other gear segment can be arranged on the valve unit on the opposite frame, in particular the base frame or tool frame.A mechanical, especially form-fitting, coupling device offers a cost-effective and reliable option for coupling devices.

[0019] In a particularly preferred embodiment, a display device, especially a mechanical one, is provided for indicating a swivel angle of the tool frame relative to the base frame. This device may include an elongated pointer rotatably mounted on the tool frame or base frame side, which can be connected to the tool frame at one end, particularly via a stop or driver, and which can display a swivel angle or a corresponding indication of an inclination of the tool frame relative to the base frame on a display at its opposite end.

[0020] Preferably, the tool frame is designed in multiple parts, in particular with a central frame arranged on the base frame side (about a pivot axis) and at least one side frame hinged laterally to the central frame and about a hinge axis. A multi-part tool frame can have a central frame and at least one side frame hinged laterally to the central frame. A tool frame can also be designed with a central frame and two side frames hinged to it. The side frames can have several frame sections connected by hinge axes and, in particular, pivotable by means of first cylinder units. The central frame can be arranged on the base frame side and be hinged about a pivot axis by means of the second cylinder unit. A side frame can be hinged laterally to the central frame about a hinge axis.One or more side frames can be pivoted along their folding axis by at least one first cylinder unit arranged on the side of the middle frame.

[0021] The invention further relates to a method for at least partially pivoting an agricultural implement designed and configured as described above. According to the invention, when a tool frame is pivoted about the pivot axis between the working position and a limit pivot angle, only the tool frame pivots about the pivot axis. Upon reaching the limit pivot angle and / or exceeding the limit pivot angle in the direction of the transport position, the tool frame pivots both about the

[0022] The pivot axis as well as the folding axis.

[0023] In the working position, the tool frame can first be pivoted into a defined, preset starting position for soil cultivation, whereby the tool frame can be aligned essentially in one plane with the base frame and / or essentially parallel to the ground, particularly a level surface. In the preset working position initially reached with the tool frame, the starting position for soil cultivation, the pivot angle between the base frame and the tool frame can be essentially zero. For soil cultivation, starting from the working position, the tilt of the tool frame relative to the base frame can be set in the form of a pivot angle.

[0024] An actuator for pivoting the tool frame can comprise a first cylinder unit for pivoting about the folding axis and a second cylinder unit for pivoting about the swivel axis. The actuator can be operated by a hydraulic system, wherein, according to the invention, the first cylinder unit and the second cylinder unit can be connected to the same hydraulic circuit, thus enabling their actuation via a single hydraulic circuit. The hydraulic system is designed such that pivoting the tool frame about the folding axis, in particular from the working position towards the transport position, occurs depending on a swivel angle of the tool frame about the swivel axis.In this system, the first cylinder unit can be locked up to an adjustable swivel angle (the limit swivel angle) or within a swivel angle range, thus preventing the tool frame from pivoting around the folding axis. This can occur, for example, when the tool frame is in its working position, so that when the second cylinder unit is actuated in this position, the tool frame would initially only pivot around the swivel axis. This allows the tilt of the implement or the tool frame to be adjusted by the second cylinder unit using only one hydraulic circuit, without allowing the tool frame to pivot around the folding axis. Above an adjustable swivel angle, the first cylinder unit can also enable pivoting of the tool frame around the folding axis, in addition to pivoting around the swivel axis.Connecting the first and second cylinder units to the same hydraulic circuit and locking the first cylinder unit up to an adjustable swivel angle, especially a limit swivel angle, allows the soil cultivation implement to be tilted, for example to adjust the working depth difference of offset working tools, with minimal design effort, cost-effectively and comfortably for the operator.

[0025] When pivoting the tool frame around the pivot axis between the working position and a limit pivot angle, only pivoting around the pivot axis is possible. However, particularly from the limit pivot angle towards the transport position, pivoting around both the pivot axis and the folding axis is possible. This allows for a pivot angle range in which initially only pivoting around the pivot axis is permitted, resulting in greater ground clearance for the tool frame when pivoting around both the pivot axis and the folding axis occurs. When pivoting from the transport position to the working position, the tool frame can be fully pivoted laterally around the folding axis before the pivoting into the working position around the pivot axis is complete. This allows for complete unfolding or...Unfolding of the tool frame must be ensured before a limit swivel angle is reached and swiveling around the folding axis is blocked.

[0026] Further details of the invention can be found in the figures and the description of the figures, which show a preferred embodiment of the invention.

[0027] They show:

[0028] Fig 1: a perspective view of an agricultural implement with tool frame in working position;

[0029] Fig. 2: a side view detail of a coupling device; and

[0030] Fig. 3: a perspective view of the coupling device and a

[0031] Display device.

[0032] Figure 1 shows an agricultural implement 10 for soil cultivation with a implement frame 12, which can be coupled to a towing vehicle (not shown). The implement frame 12 has a base frame 14 and a tool frame 16 arranged at one end of the base frame and pivotable about a pivot axis 20. The tool frame 16 has a variety of tools for soil cultivation, which can also include the application of seeds and / or fertilizers, for example, in the form of discs or rollers. The tool frame 16 shown in Figure 1 is designed in multiple parts and, in addition to a central frame 44, has two side frames 46, each pivotably arranged laterally on the central frame 44. The central frame 44 is connected to the base frame 14 and can be pivoted about the pivot axis 20 by means of a second cylinder unit 26 of the actuator 22 of the implement 10.The pivot axis 20 is arranged essentially perpendicular to a working direction A of the working device 10.

[0033] The side frames 46 are each pivotably arranged on the central frame 44 about a folding axis 18, the folding axes 18 being arranged essentially parallel to the working direction A or to a longitudinal extension of the working tool 10. The tool frame 16 and the side frames 46 are pivotable via at least one first cylinder unit 24 of the actuator 22. The first cylinder unit 24 for pivoting a side frame 46 is arranged on the central frame 44 and on the respective side frame 46. Alternatively, a single first cylinder unit 24 is conceivable, which is arranged directly on two side frames 46 and can pivot them together about their respective folding axes 18.

[0034] The first and second cylinder units 24, 26 of the actuator 22 of the work device 10 pivot the tool frame 16 from the working position shown to a transport position. The actuator 22 is operated via a hydraulic system 28, which can be supplied with energy and / or hydraulic pressure by a towing vehicle (not shown). In the transport position, the tool frame 16 is moved about the pivot axis 20 into a substantially vertical position. The side frames 46, which are also arranged substantially vertically, are pivoted forward in the working direction A about the folding axes 18.According to the invention, the at least one first cylinder unit 24 and the second cylinder unit 26 are connected to the same hydraulic circuit of the hydraulic system 28, wherein the hydraulic system 28 is configured such that the tool frame 16 pivots about the folding axis 18 depending on a pivot angle α of the tool frame 16 about the pivot axis 20. The second cylinder unit 26 can also be formed from a plurality of hydraulic cylinders. This allows both pivoting between the transport position and the working position with the first and second cylinder units 24, 26, and tilting of the tool frame 16 in the working position using only the second cylinder unit 26, to be achieved with just one hydraulic circuit.The first and second cylinder units 24, 26 are connected to the same hydraulic circuit, wherein the first cylinder unit 24 can be locked depending on the swivel angle, in particular up to an adjustable swivel angle a, the limit swivel angle aG.

[0035] Figure 2 shows a side view of the connection between the base frame 14 and the tool frame 16, or more specifically, the central frame 44 of the tool frame 16, in the working position. To improve the illustration, the side walls of the base frame 14 have been hidden in this view. The base frame 14 and the tool frame 16, in particular its central frame 44, are pivotably connected to each other about the pivot axis 20.

[0036] The hydraulic system 28 extends over both the base frame 14 and the tool frame 16, with the first cylinder unit 24 and the second cylinder unit 26 being connected via the same hydraulic circuit and pressurizable. A valve unit 30, particularly in the form of a shut-off valve located on the base frame, can lock and thus fix the first cylinder unit 24 depending on a swivel angle α, while the second cylinder unit 26 remains operable via the hydraulic circuit.

[0037] For angle-dependent actuation of the valve unit 30, a coupling device 32 is arranged adjacent to the pivot axis 20 and is connected to the valve unit 30. A pivot angle α of a pivoting movement about the pivot axis 20 between the base frame 14 and the tool frame 16 can be transmitted to the valve unit 30 via the coupling device 32. The valve unit 30 could also be arranged on the tool frame side with a correspondingly adapted coupling device 32. The coupling device 32 is designed in the form of two gear segments 34 arranged in a positive-locking mesh. One gear segment 34 on the tool frame side is arranged rotationally adjacent to the pivot axis 20 and is in a positive-locking operative connection with the second gear segment 34 on the valve unit side.The gear segment 34 arranged on the valve unit 30 is connected to it in such a way that, when rotating about a valve axis 50, it can actuate the valve unit 30 depending on the swivel angle.

[0038] For example, when a limit swivel angle aG is reached, the valve unit 30 can be locked and the first cylinder unit 24 shut off. This allows the second cylinder unit 26 to pivot the tool frame 16 within an angular range from the defined working position up to the limit swivel angle aG, thus enabling the tilting of the tool frame 16 to be adjusted. After exceeding the limit swivel angle aG, the valve unit 30 unlocks the first cylinder unit 24, so that the first and second cylinder units 24, 26 can operate until the transport position is reached, pivoting the tool frame 16 about the pivot axis 20 and the folding axis 18. The working position of the tool frame 16 shown in Figure 2 corresponds to a preset working position that can be initially approached.Here, the swivel angle α is essentially zero, where the swivel angle α indicates an inclination of the working tool 10 or an inclination of the tool frame 16 relative to the base frame 14. A display device 36 is provided to indicate the set inclination, enabling an operator, for example from a towing vehicle, to read the set inclination. For this purpose, the display device 36 has an elongated pointer 38, which is movably mounted about a pivot axis 40 adjacent to the swivel axis 20. At its end on the tool frame side, the pointer 38 has a stop 42, which is moved along with the tool frame 16 during a swivel movement, thus moving the pointer 38 about the pivot axis 40.

[0039] Figure 3 shows a perspective view of the display device 36. The pointer 38 is arranged at its end on the base frame side on a display 48 with a scale, from which an operator, particularly from a towing vehicle, can read the set inclination of the tool frame 16 or a swivel angle α. The operator can make a desired change in inclination via the hydraulic system 28 without having to manually adjust the working tool 10.

[0040] The hydraulic system 28 is designed such that during the unfolding process from the transport position to the working position, the first cylinder units 24 are fully extended before the second cylinder unit 26. Before the second cylinder unit 26 reaches its working position, the first cylinder units 24 are shut off; this occurs, for example, when the limit swivel angle aG is reached. The shut-off is effected via the valve unit 30 in the form of a shut-off valve, which is actuated by means of the coupling device 32 in the form of toothed ring segments 34 during the folding process of the tool frame 16, in particular its central frame 44.

[0041] As long as the second cylinder unit 26 is in an extended position, corresponding to the working position, the second cylinder unit 26 can be adjusted via the single hydraulic circuit for folding the implement without actuating the first cylinder unit 24. Thus, the implement tilt or the tilt of the tool frame 16 can be adjusted by moving the second cylinder unit 26.

[0042] When the implement 10 is folded from the working position to the transport position, initially only the second cylinder unit 26 is retracted. As soon as this unit has retracted a certain distance and the tool frame 16, or its central frame 44, has been set to a specific swivel angle α, in particular the limit swivel angle αG, the valve unit 32, controlled via the coupling device 32 with the gear segments 34, releases the first cylinder units 24 again. Thus, the first cylinder units 24, together with the associated side frames 46, can move to their end position in the transport position. The movement of the first cylinder unit 24 and the second cylinder unit 26 occurs essentially simultaneously, depending on the respective hydraulic pressure in the hydraulic system 28. Reference numeral

[0043] Tool A Working direction

[0044] Device frame

[0045] Base frame and swivel angle

[0046] Tool frame aG Limit swivel angle

[0047] Folding axle

[0048] Swivel axis

[0049] Actuators

[0050] First cylinder unit

[0051] Second cylinder unit

[0052] hydraulic system

[0053] Valve unit

[0054] Coupling device

[0055] gear segment

[0056] Display device

[0057] pointer

[0058] axis of rotation

[0059] stop

[0060] center frame

[0061] side frame

[0062] Advertisement

[0063] Valve shaft

Claims

Patent claims 1. Agricultural implement, in particular for soil cultivation, with an implement frame (12) comprising a base frame (14) and at least one tool frame (16), wherein the tool frame (16) is arranged, in particular laterally to the base frame (14), to be foldable about a folding axis (18) and pivotable about a pivot axis (20), in particular in a longitudinal direction of the implement, on the base frame (14), an actuator (22) arranged on the implement frame (12) for moving the tool frame (16) between a working position and a transport position, wherein the actuator (22) has at least a first cylinder unit (24) for folding the tool frame (16) about the folding axis (18), a second cylinder unit (26) for pivoting the tool frame (16) about the pivot axis (20), and a hydraulic system (28) with at least one hydraulic circuit for actuating the actuator (22), characterized in thatthat the at least one first cylinder unit (24) and the second cylinder unit (26) are connected to the same hydraulic circuit, wherein the hydraulic system (28) is designed such that the tool frame (16) pivots about the folding axis (18) depending on a pivot angle (a) of the tool frame (16) about the pivot axis (20).

2. Working device according to claim 1, characterized in that when the tool frame (16) is pivoted about the pivot axis (20) between the working position and a limit pivot angle (aG), only one The tool frame (16) pivots about the pivot axis (20), in particular from the limit pivot angle (aG) in the direction of the transport position the tool frame (16) pivots about the pivot axis (20) and the folding axis (18).

3. Working device according to claim 1 or 2, characterized in that the hydraulic system (28) is designed such that, when pivoting, in particular from a transport position to the working position, the tool frame (16) is completely pivoted laterally about the folding axis (18) before the pivoting of the tool frame (16) into the working position about the pivot axis (20) is completed.

4. Working device according to one of the preceding claims, characterized in that the hydraulic system (28) has at least one valve unit (30), in particular in the form of a shut-off valve, which can be controlled as a function of a swivel angle (a) of the tool frame (16) about the swivel axis (20).

5. Working device according to one of the preceding claims, characterized in that the valve unit (30) is designed such that when the tool frame (16) is pivoted about the pivot axis (20) between the working position and the limit pivot angle (aG), the first cylinder unit (24) is locked and only the second cylinder unit (26) is connected to the hydraulic circuit, and in particular when pivoting between the limit pivot angle (aG) and the transport position, the first and second cylinder unit (24, 26) are connected to the hydraulic circuit, in particular the same one.

6. Working device according to one of the preceding claims, characterized in that the valve unit (30) can be actuated by means of a coupling device (32) which is mounted on the base frame side and / or on the tool frame side.

7. Working device according to one of the preceding claims, characterized in that the coupling device (32) is designed in the form of a mechanical, in particular positive-locking, connection, in particular in the form of at least one gear segment (34).

8. Working device according to one of the preceding claims, characterized in that a, in particular mechanical, display device (36) is provided for displaying a swivel angle (a) of the tool frame (16) relative to the base frame (14).

9. Working device according to one of the preceding claims, characterized in that the tool frame (16) is designed in multiple parts, in particular with a central frame (44) arranged on the base frame side with at least one side frame (46) arranged laterally on the central frame (44) and foldable about a folding axis (18).

10. Method for at least partially pivoting an agricultural implement according to one of claims 1 to 9, characterized in that, that when a tool frame (16) is pivoted about the pivot axis (20) between the working position and a limit pivot angle (aG), only a pivoting of the tool frame (16) about the pivot axis (20) takes place, wherein in particular from the limit pivot angle (aG) in the direction of the transport position a The tool frame (16) is pivoted both about the pivot axis (20) and about the folding axis (18).

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