Work vehicle with at least one mounting frame

Abstract

A work vehicle (1) with at least a first mounting frame (2) on which at least a first laterally extendable work tool (5) can be mounted, and with a further second frame (35) held at a distance with respect to the direction of travel (F) on which at least a further work tool (37) extendable beyond the vehicle contour can be mounted, wherein the front mounting frame (2) can be mounted on a lower plane (E1) associated with a chassis (8) of the vehicle and on an upper plane (E2) associated with a support structure for a superstructure (9) of the vehicle (1), which can be tilted relative to each other on a pivot axis (19) extending longitudinally to the direction of travel, wherein a switchable actuator (11) is provided for action between the planes, which can be actuated in such a way that it counteracts a tendency of these planes (E1;E2) to tilt relative to each other by laterally extending the first work tool (4;5) can counteract this, is designed such that in the event of a large lateral extension of the further working tool (37) an alarm signal and / or a blockage of the further increase of the extension and / or an automatic switching to reduce or cancel the counteraction of the actuator (11) can be triggered.;

Description

[0001] The invention relates to a work vehicle with at least one front mounting frame on which at least one first, laterally extendable work tool can be held, and with a further second frame held further rearward with respect to the direction of travel, on which at least one further work tool extendable beyond the vehicle contour can be held, wherein the front mounting frame can be held on a lower plane associated with a chassis of the vehicle and on an upper plane associated with a support structure for a superstructure of the vehicle, which can be tilted relative to each other on a pivot axis extending longitudinally to the direction of travel, wherein a switchable actuator is provided for action between the planes, which can be actuated in such a way that it can counteract a tendency of these planes to tilt relative to each other by laterally extending the first work tool, according to the preamble of claim 1.

[0002] On work vehicles, especially those used for mowing, it is common practice to equip one or more booms at the front of the vehicle and, additionally, to mount another boom further back behind the cab to enable as many cuts as possible to be made side-by-side in a single pass. To be able to mow the opposite bank of a ditch, a wide reach of the rear implement is highly desirable. However, this carries the risk of a large torque acting on the vehicle around its longitudinal axis, causing the vehicle body to tilt significantly in the direction of the extending implements.

[0003] It is known to provide mounting frames for the front-mounted work tool(s) that can themselves support large and heavy work tools, in particular those equipped with mowing and / or cutting heads and capable of extending laterally. To allow this mounting frame to flex with the vehicle body relative to the chassis during travel, and to prevent the vehicle body from assuming excessive tilting during use of the work tool, it is known to mount the mounting frame in a lower plane on the vehicle's chassis and in an upper plane on a support structure of the vehicle connected to the vehicle body. The upper and lower planes are held relative to each other at a fixed pivot point and their movement relative to each other can be locked by an actuator located at a distance from this pivot point.This locking mechanism prevents excessive tilting of the superstructure, while in a free floating position of the actuator, for example, the actuating cylinder, the aforementioned spring action is possible. In this position, the actuating cylinder can be locked when the vehicle is stationary, so that the upper plane is brought into a parallel position with the lower one, and the superstructure rests on the chassis without lateral tilt. However, when the working tool is subsequently swung out, the high one-sided load, even due to tolerances in the bearings and the cylinder, causes the superstructure to yield, resulting in a tilting position relative to the chassis. With active counteracting and preload, however, it is possible to achieve a horizontal position of the vehicle with respect to its longitudinal axis, even with a wide-reaching and heavy working tool.The preload, which initially causes the vehicle to tilt slightly against the direction of extension of the working tool, can be compensated for by the extension of the working tool and the resulting load, so that the vehicle then returns to a horizontal position relative to the road surface in the working position.

[0004] However, if another, rear-mounted implement is extended into a large position, its frame can lift off without further measures, making it necessary to brace it to the vehicle frame. This stiffens the vehicle frame along part of its length, reducing the flexibility of the two longitudinal frame members relative to each other.

[0005] If all work tools are positioned far to the same side, for example to the right, the problem arises that the positioning device tends to counteract this by lifting the right-hand longitudinal member relative to the direction of travel. This resulting torsional movement of the vehicle frame can only continue longitudinally as far as the rearward point where the rear frame provides stiffening for the next work tool, not all the way to the rear. Near this rear frame stiffening point, there is therefore a risk of overloading the vehicle frame, potentially leading to breakage.

[0006] The invention is based on the problem of avoiding an overload situation for the vehicle frame, even under heavy one-sided loads on the vehicle.

[0007] The invention solves this problem by means of a work vehicle with the features of claim 1. Regarding further embodiments of the invention, reference is made to dependent claims 2 to 10.

[0008] By ensuring that, in the case of a work vehicle with at least one first and a further work tool spaced apart in the longitudinal direction of the vehicle and laterally extendable, and with a possibility of applying pressure to the vehicle frame against tilting via an actuator, an alarm signal and / or a blockage of further enlargement of the extension and / or an automatic switching to reduce or cancel the counteraction of the actuator can be triggered in the event of a large lateral extension of the further work tool, an overload of the vehicle frame is reliably prevented.

[0009] The actuator can be, for example, a cylinder with one or more pistons. If a piston of the actuator cylinder can be moved beyond a central position into a locking position, such as a stop position, the actuator cylinder can be subjected to the desired preload and the resulting tilting of the superstructure beyond this central position. It is particularly advantageous if one piston of the actuator cylinder can be moved beyond the central position in both the compression and tension directions, so that the plane of the supporting structure can be easily tilted relative to the chassis plane in two pivot indentations. This allows the cylinder to be shortened or lengthened relative to a central position, enabling it to create a preload against the extension of the working tool to either side of the vehicle.

[0010] Ideally, the actuating cylinder contains two pistons, each of which can be moved against an intermediate, movable stop by means of a piston rod, thus enabling preloading via the middle position in both the aforementioned senses, while at the same time this preload is also necessarily limited by the fixed stops of the actuating cylinder.

[0011] In one version, the driver can decide which countermeasure to take against high frame stress when an alarm signal is triggered (visual and / or acoustic).

[0012] If further extension of the reach (for example, extending a telescope) is blocked, a still non-critical reach of the rear boom and working tool can be maintained and work can continue.

[0013] If, on the other hand, a reduction or cancellation of the counteraction of the actuator can be triggered, the torsion of the vehicle frame in the front area is reduced or eliminated, thereby preventing overloading.

[0014] The measures can be implemented individually or in combination. It can be very advantageous to predefine which measures should be automated.

[0015] Provided that the additional working tool is mounted on a length-adjustable, particularly telescopic, boom, and the extension of the boom length, especially the extension of the telescope, is blocked after appropriate activation with the actuator engaged and fully counteracting, the current working state can be maintained. The driver's cab can thus remain in a horizontal position without activating the actuator, and the torsional force on the front end of the vehicle frame can be maintained without introducing excessively strong opposing torsion into the two longitudinal members of the vehicle frame further rearward.

[0016] If the additional working tool is mounted on a length-adjustable, particularly telescopic, boom, and the extension of the front working tool from its transport position is blocked when the boom is fully extended, the rear working tool can operate at a reach of, for example, over 10 meters relative to the vehicle, such as to work on the opposite embankment when digging a trench. Despite this, the cab can maintain its nearly horizontal position, as the position of the front working tool in its transport position prevents significant lateral torque from acting on the front. Overloading of the vehicle frame is thus reliably avoided.

[0017] Additionally or alternatively, the additional work tool can be moved laterally on its frame with respect to the direction of travel. In this case, the respective blocking effect can be effectively eliminated as soon as the additional work tool, with its boom, has moved beyond a predefined limit to the transverse side of the vehicle opposite the boom's extension. This creates a weight balance such that the vehicle frame no longer experiences large opposing torques in the rear area from the laterally extending boom on the one hand and the front torsion frame on the other, thus eliminating the risk of overloading the vehicle frame.

[0018] In particular, the further rearward-positioned work tool can be held on a frame resting on a platform subframe, which can be clamped to two lateral members of a vehicle frame using clamping elements, for example, turnbuckles or hydraulic cylinders. This clamping ensures that the platform subframe can no longer lift off the vehicle frame; however, the clamping elements then stiffen the vehicle frame in this area, significantly restricting the possibility of the longitudinal members moving relative to each other and thus allowing torsion of the vehicle frame.

[0019] This applies particularly when the frame, at its front end in the direction of travel, can be clamped to a right-hand frame member via a right-hand clamping element and to a left-hand frame member via a left-hand clamping element. Both members then have virtually no room to move relative to each other in this area. This is because this affects the front end of the frame, so the remaining "free" length for frame deformation is minimal.

[0020] For effective, secure mounting of the frame supporting the boom, the clamping elements can connect the frame directly to the side supports of the vehicle frame without involving the platform subframe.

[0021] It is highly advantageous to equip all vehicle wheels with measuring devices to detect the respective load caused by the extension of work tools. This allows for the timely detection of overload situations, enabling the automated initiation of effective countermeasures.

[0022] In particular, the measuring devices can determine the weight load on the respective wheel and deduce the respective torques from this.

[0023] This makes it very advantageous that, during operation, the extension of the telescope for the additional working tool and the displacement of the front working tool can be controlled using the measuring devices. The limitations can then be adjusted automatically and without human intervention.

[0024] Further advantages and features of the invention will become apparent from an embodiment of the subject matter of the invention illustrated in the drawing and described below.

[0025] The drawing shows: Fig. 1 a view of an exemplary work vehicle designed according to the invention in transport position of a work tool located at the front, wherein the body of the work vehicle is tilted relative to the chassis in the opposite direction to the extension of the work tool, Fig. 2 a similar view to Fig. 1, however, with a laterally positioned working tool and the resulting one-sided load, which brings the vehicle body into a horizontal position relative to the chassis, Fig. 3 a similar view to Fig. 1, however, of a work vehicle without an engaged actuator, wherein the body of the work vehicle is horizontally aligned with respect to the chassis, Fig. 4. A similar view of the vehicle without the actuator activated. Technology as in Fig. 3, however, with the first working tool positioned laterally and the resulting one-sided load causing the vehicle body to tilt into a slanted position relative to the chassis, Fig. 5 a support area of ​​the mounting frame connectable to the chassis for a vehicle according to Fig. 1 in perspective view from the front left at an angle, Fig. 6 the support area of ​​the mounting frame in a perspective view from a diagonal front right, Fig. 7 A work vehicle with another work tool located further back in the direction of travel and with a wide extension, whereby for the sake of clarity the front mounting frame with the first work tool is not shown, in side view from the left, Fig. 8. The vehicle frame in perspective view from a slant at the front with the actuator set at the front and the frame tensioning activated further back in full extension of the rear working tool, with the force acting on the respective areas of the vehicle frame marked by arrows. Fig. 9 A representation of the work vehicle from a slant above - without mounted front-mounted work tools - showing the torque acting on the supports of the vehicle frame by an extended rear work tool with the front actuator engaged, Fig. 10 a similar view to Fig. 9, however, with the front actuator switched off, Fig. 11 a similar view to Fig. 10, however, with the front working tool mounted and positioned to the right.

[0026] The in Fig. The work vehicle shown and designated as 1 is a self-propelled vehicle, although this is not mandatory. At least one front and / or rear mounting frame 2, which is upright in this case, is attached to the work vehicle 1. This frame includes a lower support area 3 for mounting on the vehicle and a support area 4 for at least one work tool 5 held on a boom. In particular, several work tools can be mounted on a single mounting frame 2, so that a so-called first cut and a second cut can be performed offset from each other during a single pass using only these work tools.

[0027] Here, the mounting frame 2 is shown in a front-mounted configuration, so that it is visible from the driver's cab. Rear mounting is also possible, either additionally or as an alternative. The embodiment described and drawn below refers to an example of a front-mounted installation of this mounting frame 2.

[0028] The support area 4 for the boom(s) and the work tool(s) 5 held thereon comprises several transverse guide rails 6 on which a boom 7 for the work tool 5 can be slidably mounted transversely to the direction of travel F. The boom 7 can be height- and angle-adjustable and, in particular, can also be designed to extend to both sides. Fig. Figure 2 shows its position to the right (with respect to the direction of travel F).

[0029] The working tool 5, shown here only schematically, can be designed, for example, as a mowing, cutting, or milling head, or as a clearing or cleaning head. Here, a working tool 5 is shown as an example, designed as a mowing head and equipped with cutting and / or impact elements on one or more rotating cutting or impact rollers.

[0030] The work vehicle 1 can be designed in different ways. In particular, the invention is significant for vehicles which, as vehicle frame 30, comprise a ladder frame with a support 31 on the right side with respect to the direction of travel and a support 32 on the left side.

[0031] As in Fig. As can be clearly seen in Figure 7, a rear, so-called platform auxiliary frame 34 is placed on the vehicle frame 30, which in turn carries a frame 35 for at least one further boom 36 with one or more further working tool(s) 37.

[0032] Support area 3 shows, as in the Fig. 5 and Fig. Figure 6 clearly shows a lower level E1, which can be held relative to a chassis 8 of the vehicle 1, and an upper level E2, which can be held relative to a supporting structure of the vehicle body 9. The upper and lower levels E2, E1 are held relative to each other at a fixed pivot point 10 and their movement relative to each other can be released or locked by means of an actuating cylinder 11 located laterally spaced from this pivot point 10.

[0033] For its connection to the chassis 8 - here at the front axle - the mounting frame 2 comprises ( Fig. 5) in its support area a rearward crossbeam 12 with respect to the direction of travel F, which can be rigidly connected to the front axle via flanges 13. From this crossbeam 12, a torsion tube 14 extends in the direction of travel to a front, lower crossbeam 15, which lies in the lower plane E1.

[0034] This is connected via the protruding actuating cylinder 11 and a bar 18 located at a distance and at least nearly parallel to it to an upper crossbeam 16, which is situated approximately in the plane E2 and indirectly supports the support area 4 with the transverse guide rails 6 via lateral flanges 17. An upper bearing of the bar 18 defines a pivot point with a pivot axis 19 lying in the longitudinal direction of the vehicle 1, around which the plane E2 with the vehicle superstructure attached to it can be tilted relative to the chassis plane, namely the lower plane E1.

[0035] The height of the pivot point 10 can be adjustable, for example by the bolt 18 containing a turnbuckle or a similar length adjustment mechanism - not shown here - and by which the pivot point 10 can be fine-tuned as the upper pivot of the bolt 18 relative to the lower plane E1.

[0036] The actuating cylinder 11 is movably held at a lower bearing point 20 on the lower crossbeam 15 and at an upper bearing point 21 on the upper crossbeam 16.

[0037] The actuator 11 can be actuated in such a way that it can be moved from a floating position, which allows the movement of the crossbeams 16 and 15 relative to each other, into a blocking position in which the upper plane E2 can be displaced into a position slightly tilted about the longitudinal axis 19 relative to the lower plane E1, so that the vehicle body 9 can be positioned as shown in Fig. 1 assumes a tilted, inclined position relative to the lower plane E1. The tilt is slight, so that in the tilted position, the upper plane E2 is inclined by a maximum of 6° relative to the lower plane E1 (depending on tolerances in the components and bearings). By extending the working tool 5, the upper plane E2, together with the vehicle body 9, comes into a horizontal position, as shown in Fig. Figure 2 shows that the upper and lower planes E1 and E2 are parallel. The height adjustability of the pivot point 10 allows for precise parallel alignment – ​​with a deviation of significantly less than 1° or better – of the planes E1 and E2 in the extended position. Fig. 2 will be aligned.

[0038] In the floating position of the actuator 11, it is not pressurized, so that the superstructure 9 can spring freely relative to the chassis 8 and also tilt sideways, as is desired during normal driving, in which the boom 7 and the working tool 5 are held in transport position.

[0039] The actuator 11 thus makes it possible to counteract any tendency of the planes E1, E2 to tilt relative to each other by laterally extending the first working tool 4, 5. For this counteraction, when the actuator 11 is switched on, a torque is exerted in the direction of arrow 22 on the front part of the vehicle frame 30 in the direction of travel F.

[0040] However, if the additional working tool 37 is mounted on the frame 35 and the frame is supported downwards and rearwards relative to the vehicle frame 30 by a platform subframe 34 (described in more detail below), it becomes necessary to clamp the frame 35 relative to the vehicle frame 30 using clamping elements 38 to two lateral supports 31, 32 of a vehicle frame 30 when the boom 36 is extended to a high lateral or rearward extent. This reliably prevents the upper frame 35 from lifting off one side.

[0041] As an example, the frame 35 can be clamped at its front end in the direction of travel F via a right clamping element 38 to a right support 31 of the vehicle frame 30 and via a left clamping element 38 to a left support 32 of the vehicle frame 30.

[0042] The work vehicle 1 can be designed in different ways. In particular, the invention is significant for vehicles which, as vehicle frame 30, comprise a ladder frame with a support 31 on the right side with respect to the direction of travel and a support 32 on the left side.

[0043] As in Fig. As can be clearly seen in Figure 7, a rear, so-called platform auxiliary frame 34 is placed on the vehicle frame 30 for the further working tool 37, which in turn carries a frame 35 for at least one further boom 36 with one or more further working tool(s) 37.

[0044] Since the platform subframe 34 is movably held on the vehicle frame 30 by the chassis manufacturer (for example, bolted via disc spring assemblies) to prevent the movement of the vehicle frame 30 from being blocked under torsional stress during transport (i.e., without the work tools 5, 37 deployed), the platform subframe 34 can lift off the vehicle frame 30 on one side in the direction of arrow K. To counteract this, clamping elements 38 are provided here, which clamp the frame 35 supporting the boom 36 to the vehicle frame 30. These can be, for example, turnbuckles or active actuators such as hydraulic cylinders. Here, they are arranged at the front end 33 of the frame 35.

[0045] The frame 35 can be clamped at its front end in the direction of travel F via a right tension member 38 to a right support 31 of the vehicle frame 30 and via a left tension element 38 to a left support 32 of the vehicle frame 30.

[0046] The clamping elements 38 can connect the upper frame 35 supporting the boom directly to the side supports 31, 32 of the vehicle frame 30 and, without their own attachment to the platform subframe 34, to the side supports 31, 32 of the vehicle frame 30.

[0047] In Fig. Figure 8 highlights the problem with these functions: in the aforementioned activated position, the front actuator 11 exerts a torque in the direction of arrow 22, lifting the right-hand support 31 of the vehicle frame (arrows 23 on the right support 31) and thereby exerting downward forces 24 on the left support 32. However, the torsional capacity of the vehicle frame 30 ends at the clamping elements 38 and does not extend to the rear. In the rear area behind the clamping elements 38, a counter-rotating torque 28 acts due to the lateral extension of the additional working tool 37 on the boom 36, resulting in downward forces 25 on the right support 31 and upward forces 26 on the left support 32. In the limit region 27, this creates a potential overload problem for the supports 31 and 32 of the vehicle frame 30.

[0048] According to the invention, to avoid overload in the case of a large lateral extension of the further working tool 37, either an alarm signal (optical and / or acoustic) and / or a blockage of the further enlargement of the extension of this boom 36 and / or an automatic switching to reduce or cancel the counteraction of the actuator 11 can be triggered.

[0049] Depending on the requirements, intervention can be made at different points. For example, if in a fifth or sixth cut the further boom 36 is to be extended so far that an oncoming embankment of a ditch running parallel to the road is to be mowed, the front boom 7 can then be folded in so that the actuator 11 can be moved into a floating position. If only the actuator 11 is switched off, a tilting of the vehicle superstructure can occur with a very large extension of the front boom 7, as shown in Fig. 4 results, which can be tolerable up to a limit. Then the front torque 29 is in the same direction as the rear torque 28 ( Fig. 11).

[0050] Additionally or alternatively, if the front boom 7 is extended to a high position and the actuator 11 is switched on, further extension of the other boom 37 (e.g., in the case of length changes via the extension of a telescope or other measures) may be blocked.

[0051] The limit values ​​can in all cases be preset or controlled or regulated by measured values ​​40 of the torques - for example at the wheels 39.

[0052] If the additional working tool 37 is held on a length-adjustable, in particular telescopic, boom 36, and if, at the full length of this boom 36, the extension of at least one front working tool 5 from a transport position is blocked, it is possible that the additional boom can be used, for example, for a slope on the other side of a roadside ditch, without an actuator 11 having to act on the vehicle 1 in the front area. The actuator 11 can then be disengaged.

[0053] Furthermore, it is also advantageous that the additional working tool 37 can be moved transversely on its frame 35, for example via rails 41, in the transverse direction Q. In this case, the respective blocking effect of the actuator 11 can be automatically released as soon as this additional working tool 37 with its boom 36 has moved beyond a predefined limit value to the transverse side of the vehicle 1 opposite the extension, i.e., to the left with respect to the direction of travel F as shown in the drawing.

[0054] This limit value can also be determined in advance for control purposes. Alternatively, measuring devices 40 can be provided on all vehicle wheels 39 to measure the respective load caused by the extension of working tools 5, 7. These measuring devices 40 can then determine the weight load on the respective wheel 39 and thereby infer the currently acting torques, thus enabling control of the safety device according to the invention.

[0055] This means that during operation the extendability of the telescope for the boom 36 of the further working tool 37 as well as the displacement of the front working tool 5 can be fully controlled with the help of the measuring devices 40. Reference symbol list: 1 work vehicle, 2 mounting frames, 3 Support area of ​​the mounting frame, 4 Load-bearing capacity of the mounting frame, 5 work tools, 6 guide rails, 7 outriggers, 8 Chassis, 9 Vehicle body, 10 pivot point, 11 Actuator, 12 crossbeams, 13 flange, 14 Torsion tube, 15 lower crossbeams, 16 upper crossbeams, 17 side flanges, 18 bars, 19 axis of rotation, 20 lower bearing of the actuator, 21 upper bearing of the actuator, 22 Torque application, 23 upward-pointing forces, 24 downward-pointing forces, 25 downward-pointing forces, 26 upward-pointing forces, 27 Border area, 28 opposing torques, 29 rectified front torque, 30 vehicle frames, 31 right support, 32 left support, 33 front end of the frame, 34 flatbed support frames, 35 frames, 36 additional booms, 37 additional work tools, 38 clamping elements, 39 wheels, 40 measuring devices for force measurement, 41 rails, E1 lower level, E2 upper level F Direction of travel, Q transverse direction, K lifting force

Claims

Work vehicle (1) with at least one first mounting frame (2) on which at least one first laterally extendable work tool (5) can be held, and with a further second frame (35) held at a distance with respect to the direction of travel (F) on which at least one further work tool (37) extendable beyond the vehicle contour can be held, wherein the front mounting frame (2) can be held on a lower plane (E1) associated with a chassis (8) of the vehicle and on an upper plane (E2) associated with a support structure for a superstructure (9) of the vehicle (1), which can be tilted relative to each other on a pivot axis (19) extending longitudinally to the direction of travel, wherein a switchable actuator (11) is provided for action between the planes, which can be actuated in such a way that it counteracts a tendency of these planes (E1;E2) to tilt relative to each other by laterally extending the first work tool (4;5) can counteract, characterized in that, in the event of a large lateral extension of the further working tool (37), an alarm signal and / or a blockage of the further enlargement of the extension and / or an automatic switching to reduce or cancel the counteraction of the actuator (11) can be triggered. Working vehicle (1) according to claim 1, characterized in that the further working tool (37) is held on a length-variable, in particular telescopic, boom (36) and the increase of the boom length, in particular the extension of the telescope, is blocked when the actuator (11) is switched on and fully counteracting. Working vehicle (1) according to one of claims 1 or 2, characterized in that the further working tool (37) is held on a length-variable, in particular telescopic, boom (36) and from a limit length at which a predetermined limit torque value of this boom (36) is exceeded, the extension of the at least one front working tool (5) from a transport position is blocked or limited. Work vehicle (1) according to one of claims 1 to 3, characterized in that the further work tool (37) is movable transversely (Q) on its frame (35) and the respective blocking effect is lifted as soon as the further work tool (37) with its boom (36) has moved beyond a limit value in the direction of the transverse side of the vehicle (1) opposite the boom. Work vehicle (1) according to one of claims 1 to 4, characterized in that the further work tool (37) is held on a frame (35) lying on a platform subframe (34), which can be clamped to two lateral supports (31;32) of a vehicle frame (30) via clamping elements (38). Work vehicle (1) according to claim 5, characterized in that the frame (35) can be clamped at its front end in the direction of travel (F) via a right clamping element (38) to a right support (31) of the vehicle frame (30) and via a left clamping element (38) to a left support (32) of the vehicle frame (30). Work vehicle (1) according to one of claims 5 or 6, characterized in that the clamping elements (38) connect the frame (35) directly to the side supports (31;32) of the vehicle frame (30). Work vehicle (1) according to one of claims 1 to 7, characterized in that measuring devices (40) for the respective load caused by the extension of work tools (5;37) are provided on all vehicle wheels (39). Work vehicle (1) according to claim 8, characterized in that the measuring devices (40) determine the weight load on the respective wheel (39). Working vehicle (1) according to one of claims 8 or 9, characterized in that in operation the extendability of the telescope and / or the lateral displacement of the rear working tool (37) as well as the displaceability of the at least one front working tool (5) can be controlled by means of the measuring devices (40).

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