FRONT LOADER, WORK VEHICLE AND WORK VEHICLE SYSTEM

Description

TECHNICAL AREA OF INVENTION

[0001] Work vehicles, especially tractors equipped with a front loader, are used in agriculture or municipal services for lifting, lowering, and transporting loads. A tractor with an attached front loader can function as a wheel loader.

[0002] Common front loaders feature a boom with a column that can be mounted to a mounting bracket, particularly a mounting tower, of a work vehicle. At the end of the boom opposite the column, the front loader has a tool attachment point, allowing it to be detachably coupled with a tool such as a manure fork, bucket, pallet fork, heavy-duty tine fork, round bale fork, or beet basket. It is also possible to attach a tool that performs a working stroke, such as a cutting shear, a box rotator, or a grapple (e.g., a plastic bale grapple, a solid manure grapple, or a log grapple).

[0003] Conventional booms consist of a front and a rear beam. The beams are formed from steel tube profiles that are welded together at an angle at their opposing ends. Hydraulic cylinders, supplied and controlled by the work vehicle, allow for the pivoting of the front loader around a pivot bearing located between the column and the boom, as well as the movement of the implement holder relative to the boom. The operator can control the hydraulic actuation of the cylinders using levers.Alternatively, the hydraulic actuation of the hydraulic cylinders can be controlled via a joystick or a cross lever. Moving the joystick or cross lever forward and backward raises and lowers the front loader boom, while moving it right and left changes the swivel angle of the implement holder relative to the boom around a transverse axis. Additional push and / or rocker switches can control further functions, in particular the operation of an implement performing a working stroke.

[0004] The hydraulic cylinders are supplied with hydraulic fluid via connecting lines between the work vehicle and the front loader, with the hydraulic fluid provided by the tractor's own hydraulic pump. The hydraulic system can be controlled from the driver's seat using controls such as levers, switches, or a joystick, as well as via controls on the work vehicle and / or on the front loader, including electromagnetic control of the control valves. The hydraulic system's connecting lines between the work vehicle and the front loader can be individually coupled via fittings, or a so-called "multi-coupling" can be used, allowing several or all hydraulic connections to be coupled simultaneously.

[0005] The tool holder can be designed as a so-called Euro quick-change frame or as a tool holder according to one of the standards EN 12525 or ISO 24410.

[0006] Automatic coupling devices are also used, which allow the coupling of the tool holder with the tool and its locking to be achieved without the driver having to leave the driver's cab.

[0007] Parallel guidance systems can be used to coordinate the hydraulic pressures of the hydraulic cylinder for raising and lowering the boom and the hydraulic cylinder for pivoting the tool holder relative to the boom in such a way that the angle between the tool holder and the ground does not change or only changes within narrow limits during the raising and lowering of the boom.

[0008] In this technical field, the invention relates to a front loader for a work vehicle, a work vehicle with an attachment console for coupling the work vehicle with a front loader, and a work vehicle system comprising a work vehicle and a front loader. STATE OF THE ART

[0009] Patent DE 10 2005 048 280 B4 of the applicant discloses general prior art applicable within the scope of the invention relating to driver-operated valves of the work vehicle for controlling the hydraulic actuation of the hydraulic cylinders of the front loader, additional solenoid valves and hydraulic coupling devices for coupling connecting lines between the work vehicle and the front loader.

[0010] The applicant's patent application DE 10 2005 053 041 A1 discloses general prior art applicable within the scope of the invention with respect to a front loader comprising a column, rigidly connected arms, and a tool holder, as well as two hydraulic cylinders, one for raising and lowering the boom and the other for pivoting the tool holder. The front loader has a support leg that can be folded out via a further hydraulic cylinder.With the support leg extended, the front loader can be parked on the tool holder or on a tool such as a bucket and the support leg, with the center of gravity of the front loader with tool located on the ground between the parking positions, but the front loader can also extend beyond the space between the parking positions for good accessibility of the column to allow coupling of the column to the mounting bracket of the work vehicle.

[0011] Patent DE 10 2009 046 213 B4 of the applicant discloses general prior art applicable within the scope of the invention for the design of a tool holder according to ISO 24410 and a locking mechanism for locking the tool in the tool holder.

[0012] Patent EP 1 813 730 B1 of the applicant discloses general prior art applicable within the scope of the invention for the design of a hydraulic system for controlling a front loader and for pressure control in the hydraulic system.

[0013] The applicant's patent EP 1 903 147 B1 discloses general prior art applicable within the scope of the invention for the geometric design of the arms of a front loader boom and the integration of the front loader's actuation kinematics with the hydraulic cylinders into the front loader.

[0014] The applicant's patent EP 2 840 186 B1 discloses general prior art, usable within the scope of the invention, for the design of an attachment console, here in an embodiment with a so-called bone, and for the design of a locking or latching device for locking the column of the front loader to the attachment console.

[0015] Patent EP 3 158 842 B1 discloses design possibilities for an attachment console of the work vehicle that can be used within the scope of the invention, which here is formed by two attachment towers on both sides of the work vehicle, which have longitudinally extending plate-shaped frame elements and vertically extending supports with an end-side bone.

[0016] The applicant's patent EP 3 431 668 B1 discloses general prior art applicable within the scope of the invention for the design of a partial fairing for the front loader to cover moving components, in particular a control rod.

[0017] The applicant's patent application EP 4 144 925 A1 discloses further possibilities for the design of an attachment bracket in the form of an attachment tower that can be used within the scope of the invention, wherein the attachment tower is at least partially manufactured by means of solid forming.

[0018] The website https: / / youtu.be / JchP-UKsL84 (accessed on July 12, 2023) discloses a front loader in which the rear arm of the boom, facing the vehicle, is telescopic. This front loader is also shown and described (with reference to a patent application) on the website www.lfprototipi.com / portfolio-type / caricatore-frontale-telescopico-brevettato.

[0019] US Patent 3,907,143 A discloses a hydraulically operated front loader for a tractor. The front loader has an angled, rigid boom and a straight, upward-sloping arm rigidly attached to the tractor frame. These two components are connected to each other via a pivot bearing and can be pivoted relative to each other by means of a hydraulic cylinder. The arm can be extended telescopically by means of a hydraulic cylinder to raise the boom. To absorb a bending moment resulting from the weight of the boom and any load, the arm is additionally supported by a brace on the tractor frame. A boom connected to an arm via a pivot bearing is provided on each side of the tractor.

[0020] Patent AT 511 381 A1 discloses a loading arm for a tractor. The loading arm is supported on the ground and the tractor by two legs. Above the legs is a pivot bearing with a vertical pivot axis, about which the loading arm can pivot in a horizontal plane. The loading arm has a boom with two arms connected by a pivot bearing and pivotable relative to each other by a hydraulic cylinder. The front arm of the loading arm's boom is telescopically extendable by means of a hydraulic cylinder.

[0021] Patent PL 243 090 B1 discloses an underground vehicle (LHD loader) used to load, transport, and unload overburden in a mine. The front loader has two parallel, horizontal loader arms, each telescopically extendable via a hydraulic cylinder located inside the arms. This allows the bucket, held by the loader arms, to be inserted into a pile of overburden. Each loader arm has a rotary actuator at both ends. At one end, the loader arms are attached to a vehicle via the rotary actuators. The bucket is attached to the rotary actuators at the other end of the loader arms. Coordinated pivoting of all rotary actuators and telescoping of the loader arms allows the bucket to be tilted and moved within the plane of rotation.For example, a purely vertical movement of the shovel at a constant inclination or a horizontal movement of the shovel to pick up cargo when the vehicle is stationary can be generated. TASK OF INVENTION

[0022] The present invention is based on the objective of to propose a front loader for a work vehicle, a work vehicle and a work vehicle system, which or which, in particular with regard to the degrees of freedom of the front loader and a tool attached to it and / or the working area of ​​the front loader and the tool attached to it and / or an improvement of the user's field of vision in the cab of the work vehicle, especially while driving has improved. SOLUTION

[0023] The object of the invention is achieved according to the invention by the features of the independent claims. Further preferred embodiments of the invention can be found in the dependent claims. DESCRIPTION OF THE INVENTION

[0024] The invention proposes a front loader, designed for use on a work vehicle, particularly a tractor, and featuring a boom, to solve the underlying problem. The boom has a front frame and a rear frame. Furthermore, the front loader can have a tool holder articulated to the front frame and pivotable via a hydraulic cylinder, and / or a column articulated to the rear frame and pivotable via a hydraulic cylinder.

[0025] According to the invention, it is proposed that the rocker arm formed by the outriggers is not rigid, but has at least one degree of freedom: In the front loader according to the invention, an outrigger can be telescopically extended into different telescopic positions by means of a first actuator, thus changing the length of this outrigger. The telescopic outrigger can be the front outrigger. Preferably, however, the rear outrigger is telescopic. The invention also includes embodiments in which both outriggers are telescopic.

[0026] To ensure telescoping capability, the frame can have two frame sections, each designed to receive and rigidly support the load acting on the front loader and movable relative to each other to achieve different telescoping positions.

[0027] According to the invention, the front loader has two parallel front loader sections. The front loader sections are connected to each other by cross braces. Each of the two front loader sections has a column by which the front loader sections can be connected to a corresponding mounting bracket of the work vehicle.

[0028] The invention proposes, in a first embodiment, that the boom has an additional degree of freedom: In this embodiment, the two arms can be pivoted around a pivot bearing into different (relative) pivot positions. The pivoting of the arms around the pivot bearing is effected by means of a second actuator. In this embodiment of the invention, the length of the front loader, which in particular refers to the distance between the opposite end regions of the arms or the distance of the column from the tool holder, depends on both the telescopic position and the pivot position. The two degrees of freedom enable modified control options for the movement of the tool holder and the tool attached to it. It is also possible to increase the range of change of the front loader's length, for example, by...The length is minimal with the telescopic boom fully retracted and the longitudinal axes of the two arms at their maximum swivel angle, while the front loader's length is maximal with the telescopic boom fully extended and the swivel position closest to the longitudinal axes of the arms being fully extended. It is also possible to achieve the same position at the end of the boom, where the implement mount is pivotably mounted, for different relative swivel angles of the arms and different telescopic positions (and potentially also for different positions of the hydraulic cylinder for raising and lowering the boom), which can be used to expand the movement and control options.

[0029] In a second variant (which can be used alternatively or in combination with the first variant), the first actuator is integrated into the frame. This allows for a very compact design of the frame and thus of the front loader, while also providing a certain degree of protection for the first actuator.

[0030] To give just one example that does not limit the invention, the spar sections of the telescopic spar, on which the first actuator acts, can form a cross-section that defines an interior space in which the first actuator is then arranged. The cross-section of at least one spar section can be closed at the edges, so that the actuator (at least in a longitudinal section) is completely located inside the at least one spar section. However, it is also possible for the spar sections to have an open cross-section (for example, a slotted cross-section or a U-shaped cross-section), in which case the opening at the edge of one spar section can be closed by the other spar section.

[0031] Within the scope of the invention, "telescoping" of the spar parts is understood to mean both a movement of the spar parts apart to increase the length and a sliding of the spar parts into one another to reduce the length.

[0032] Any type of actuator can be used within the scope of the invention, and actuators of different types may also be employed. For example, the actuators may be designed as electric linear motors that act directly on the frame sections for telescoping, or, similar to a hydraulic cylinder, be articulated at a distance from the rocker arm pivot bearing with their two end regions attached to the frame sections to be pivoted. It is also possible that the pivoting of the frame sections around the rocker arm pivot bearing is effected by an electric rotary drive. However, in one aspect of the invention, the first actuator and / or the second actuator is designed as a hydraulic actuator, in particular with a hydraulic cylinder. Such hydraulic actuators can be easily integrated into a hydraulic system of a work vehicle and a front loader of a generally known design.On the other hand, it has been shown that operating the front loader using hydraulic cylinders is robust and, depending on the hydraulic ratio, allows for the provision of large forces for lifting, lowering, telescoping and / or swiveling.

[0033] It is possible that, within the scope of the invention, the first actuator and / or the second actuator can be actuated separately by the user, whereby this can then serve to actuate the actuators simultaneously and / or to actuate the actuators one after the other or at different times.

[0034] In a particular aspect of the invention, the front loader (or the work vehicle) has a coordination device that coordinates the actuation of the first actuator and the second actuator. The following are some examples of the coordination performed by the coordination device, which are not intended to limit the scope of the invention and the possible coordination measures: It is possible that a tool held at the tool holder, such as a shovel or bale fork, needs to be moved parallel to the ground, for example, to insert the open shovel into a pile of sand to fill it, or to push a bale fork into or under a bale. If the telescopic handle is not horizontally oriented in this case, the telescoping of the handle sections will cause the height of the tool holder and the tool held within it to change in an undesirable way. In this case, the coordination system can actuate the second actuator simultaneously with the first actuator in such a way that this actuation precisely compensates for the undesired change in the height of the tool holder and the tool.The same principle applies in reverse if, in principle, the movement of the tool holder or the tool is brought about by actuating the second actuator, while a compensating movement is then brought about by the first actuator via the coordination device. The same applies if a tool holder with a tool attached to it is to be moved vertically, for example, to lift a bale vertically. If the telescopic handle is not vertically oriented, the telescoping of the handle sections leads to a superimposed, undesired horizontal movement, which can be compensated for by the coordination device through the simultaneous actuation of the second actuator. The same principle applies in reverse.

[0035] The spar sections can have a straight, curved, or angled longitudinal axis and a constant or arbitrarily variable cross-section along the longitudinal axis, as long as the spar sections are telescopic. Preferably, the spar sections have at least one straight longitudinal section in which the outer cross-section of an inner spar section is guided within a cross-section of the outer spar section. In this guiding and telescopic longitudinal section, the spar sections preferably have non-circular guide cross-sections. The non-circular guide cross-sections can then form a positive fit circumferentially around the longitudinal axis, which blocks relative rotation of the spar sections around the longitudinal axis. The non-circular guide cross-sections can then provide the longitudinal degree of freedom for telescoping the spar sections.

[0036] It is possible that the spar sections slide directly against each other in this telescoping guide area. According to one aspect of the invention, the guidance can be ensured or improved and / or the friction between the spar sections during telescoping reduced by arranging sliding bearing elements between the guide cross-sections of the spar sections. The spar sections are then guided by these sliding bearing elements. The sliding bearing elements can be designed according to any sliding bearing elements available in the prior art. For example, sliding plates can be used as sliding bearing elements. Here, for instance, several such flat sliding plates can be arranged distributed over a non-circular guide cross-section of the spar sections, which then ensure that the spar sections are supported against each other vertically to the longitudinal or telescoping axis in different directions.

[0037] Another solution to the problem underlying the invention is a work vehicle. The work vehicle is equipped with a mounting bracket that allows it to be coupled to a front loader, as previously described. For this purpose, the work vehicle has connecting lines. A first connecting line serves to actuate the first actuator in order to extend the boom into different telescopic positions. Furthermore, the work vehicle has a second connecting line.

[0038] The second connecting line supplies the actuator with force to pivot the arms around the swing arm pivot bearing into different positions. The first and second connecting lines can be electrical lines, transmitting control signals to the actuators and / or supplying them with electrical power. Preferably, the first and second connecting lines are hydraulic lines, supplying hydraulic force to the actuators, which are then designed as hydraulic cylinders. The connecting lines have suitable connections for coupling them between the work vehicle and the front loader.

[0039] Another solution to the problem underlying the invention is a work vehicle system comprising a work vehicle of the type described above and a front loader described above. In this case, the front loader has a column that is detachably attached to the mounting bracket. The work vehicle and the front loader are then connected to each other via the first connecting line and the second connecting line. The first actuator and the second actuator are then actuated (in particular electrically, electropneumatically, electrohydraulically, or hydraulically) via the connecting lines.

[0040] Advantageous further developments of the invention result from the patent claims, the description and the drawings.

[0041] The advantages of features and combinations of features mentioned in the description are merely exemplary and can have an effect alternatively or cumulatively, without the advantages necessarily having to be achieved by embodiments according to the invention.

[0042] Regarding the disclosure content—not the scope of protection—of the original application documents and the patent, the following applies: Further features can be derived from the drawings—in particular, the geometries depicted and the relative dimensions of several components to one another, as well as their relative arrangement and functional connection. The combination of features from different embodiments of the invention or from features of different claims is also possible, deviating from the chosen cross-references of the claims, and is hereby encouraged. This also applies to features that are illustrated in separate drawings or mentioned in their description. These features can also be combined with features from different claims.Likewise, features listed in the patent claims may be omitted for further embodiments of the invention, but this does not apply to the independent patent claims of the granted patent.

[0043] The features mentioned in the claims and the description are to be understood, with regard to their number, as meaning that exactly that number or a greater number than the stated number is present, without the need for the explicit use of the adverb "at least". Thus, for example, if a connecting line or a sliding bearing element is mentioned, this is to be understood as meaning that exactly one connecting line or exactly one sliding bearing element, two connecting lines or sliding bearing elements, or more connecting lines or sliding bearing elements are present. The features listed in the claims may be supplemented by further features or may be the only features that the subject matter of the respective claim possesses.

[0044] The reference numerals contained in the patent claims do not constitute a limitation of the scope of the subject matter protected by the patent claims. They merely serve the purpose of making the patent claims easier to understand. BRIEF DESCRIPTION OF THE FIGURES

[0045] The invention will now be further explained and described with reference to preferred embodiments shown in the figures. Fig. 1 shows a front loader in a longitudinal section with an angled swivel position of the handlebars and a telescopic handlebar retracted to its maximum extent. Fig. 2 shows a cross-section II-II of the front loader according to Fig. 1 . Fig. 3 shows the front loader according to Fig. 1 and 2 in a longitudinal section with an angled swivel position of the beams and with a telescopic beam extended to its maximum extent. Fig. 4 shows the front loader according to Figs. 1 to 3in a longitudinal section with the beams in a pivoted position forming an extension position and with a telescopic beam retracted to its maximum extent. Fig. 5 shows the front loader according to Figs. 1 to 4 in a side view. Fig. 6 shows the front loader according to Figs. 1 to 5 in a top view. FIGURE DESCRIPTION

[0046] In the figures, components and features that are identical or similar in design and / or function are sometimes identified by the same reference numbers, which may then be distinguished from one another by an additional letter a, b, ... In this case, reference may be made to the components or features with or without the supplementary letter, thereby referring to one, several, or all of the components or features identified by these reference numbers.

[0047] Fig. 1Figure 1 shows a front loader 1. The front loader has a column 2, a boom 3, and a tool holder (not shown). The column 2 has fastening elements 4 and 5, by means of which the column 2 can be detachably attached to a mounting bracket of a work vehicle. In the illustrated embodiment, the fastening elements 4 and 5 are designed as fastening bolts oriented vertically to the plane of the drawing.

[0048] In a pivot bearing 6, the rocker arm 3 is pivotally connected to the column 2 about a pivot axis 7 oriented vertically to the plane of the drawing. The pivoting of the rocker arm 3 about the pivot axis 7 relative to the column 2 can be effected by means of an actuator 8, which here is designed as a hydraulic cylinder 9. Although the rocker arm 3 is pivoted about the pivot axis 7, for the sake of simplicity, the pivoting of the rocker arm 3 about the pivot axis 7 by means of the hydraulic cylinder 9 is also referred to as raising or lowering the front loader 1.

[0049] The rocker arm 3 has arms 10 and 11. The arms 10 and 11 are pivotable at their opposing ends via a rocker arm pivot bearing 12 about a rocker arm pivot axis 13. The pivoting about the rocker arm pivot axis 13 is effected by an actuator 14, which is also referred to here as a "second actuator" and is designed as a hydraulic cylinder 15. The actuator 14 is articulated to the arms 10 and 11 at a distance from the rocker arm pivot bearing 12 at each end.

[0050] In the end region opposite the swing arm pivot bearing 12, the spar 11 has a pivot bearing 16, of which in Fig. 1Only one bearing eye is shown. The tool holder (not shown) is pivotally mounted to the tie bar 11 in the pivot bearing 16. Spaced apart from the pivot bearing 16, an actuator 17, also designed here as a hydraulic cylinder, is mounted to the tool holder in a pivot bearing 19. The other end of the actuator 17 is mounted to the tie bar 11 via a pivot bearing 35. Depending on the travel of the actuator 17, the tool holder and the tool held in the tool holder can be pivoted about the pivot axis of the tie bar 11 defined by the pivot bearing 16.

[0051] The spar 10 has spar sections 20 and 21 which are connected to each other via a guide device 22 such that the spar sections 20 and 21 have a telescopic degree of freedom 23 by means of which a change in the length of the spar 10 can be effected. In the illustrated embodiment, the guide device 22 with the telescopic degree of freedom 23 is provided by one spar section (here, spar section 20, on which the pivot bearing 12 is formed) being received and guided in the other spar section (here, spar section 21, on which the pivot bearing 6 is formed). For this purpose, the outer cross-section of spar section 20 (with clearance to allow movement) is designed to correspond to the inner cross-section of spar section 21.

[0052] Fig. 2Figure 1 shows an example of the cross-sectional design of the spar sections 20 and 21. It can be seen that the spar sections 20 and 21 (at least in the area of ​​the guide device 22) have corresponding hexagonal cross-sections. The hexagonal cross-sections result in the cross-section having six flat surfaces between the six corners, which ensure good support between the spar sections 20 and 21 in the direction of the surface normals of the surfaces.

[0053] Between the spar parts 20, 21, sliding bearing elements 24 are arranged, which for the illustrated embodiment are designed as sliding bearing plates 25, which are arranged on one of the partial surfaces of the hexagonal cross-sections.

[0054] Telescoping of the spar sections 20, 21 is effected by means of an actuator 26, which here is designed as a hydraulic cylinder 26 and is integrated into the spar 10 and the spar sections 20, 21. The spar sections 20, 21 define an interior space 28 in which the hydraulic cylinder 27 is arranged and through which the hydraulic cylinder 27 extends.

[0055] The actuator 26, here a piston rod 30, is articulated to the spar part 20 by a pivot bearing 29, while the other end area of ​​the actuator 26, here the cylinder housing 31, is articulated to the spar part 21 by a pivot bearing 32.

[0056] In Fig. 1 The length of the telescopic pole 10 is minimal, so that the actuator 26 or hydraulic cylinder 27 is fully retracted. Furthermore, in Fig. 1The actuator 14 or hydraulic cylinder 15 is partially, largely or completely retracted, so that a swivel angle between the longitudinal axes of the beams 10, 11 about the swivel axis 13 results, which lies in the range between 90° and 180°, here approximately 120° to 130°.

[0057] Fig. 3Figure 1 shows a changed operating position of the front loader 1, which is brought about by extending the actuator 26 or hydraulic cylinder 27, thereby increasing the length of the boom 10. This telescopic extension of the boom 10, due to its horizontal orientation, causes a tool held at the tool holder to move horizontally towards the ground. The reach of the front loader 11 is increased by the telescoping of the boom 10. The length of the arm 3, which defines the distance between the pivot bearings 6 and 16, has been increased by extending the actuator 26 or hydraulic cylinder 27. Due to the angle of the booms 10 and 11, the increase in the length of the arm 3 is less than the increase in the length of the boom 10.

[0058] Fig. 4 shows another operating position of the front loader 1, which differs from the operating position according to Fig. 1This is achieved by extending the actuator 14 or hydraulic cylinder 15 such that the arms 10, 11 assume their extended position, in which the longitudinal axes of the arms 10, 11 are arranged parallel or aligned with each other. This extension of the actuator 14 leads to an increase in the length of the rocker arm 3, which here is accompanied on the one hand by a lifting of the tool holder and the tool and on the other hand by a superimposed horizontal movement of the tool holder with the tool.

[0059] An operating position with a maximum length of the rocker arm 3 can be achieved by fully extending the actuator 26 or hydraulic cylinder 27, thereby telescoping the beam 10 to its maximum length ( Fig. 3 ) and by fully extending the actuator 14 or hydraulic cylinder 15, the tie bars 10, 11 assume the extended position (see Fig. 4 ).

[0060] Fig. 5shows the front loader 1 in an uncropped side view. For the in Fig. 5 The operating position shown is different from the operating positions according to Fig. 1 , 3 and 4 The actuator 8 or hydraulic cylinder 9 is partially retracted, which results in the beam 10 being inclined downwards. The beam 10 is the one in Fig. 5 The actuator 14 or the hydraulic cylinder 15 assumes an operating position in which the tie bars 10, 11 are angled.

[0061] In Fig. 6 It can be seen that the front loader 1 has two parallel, corresponding or identical front loader parts 33a, 33b, which are connected to each other by crossbars 34a, 34b. The two front loader parts 33 each have a column 2a, 2b, via which the front loader parts 33a, 33b can each be connected to an associated mounting bracket of the work vehicle.

[0062] The figures may not accurately depict the operating positions of the pistons and piston rods for the described operating positions of the front loader, but the person skilled in the art will interpret the figures by expertly adjusting the operating positions of the pistons and piston rods. REFERENCE MARK LIST

[0063] 1 Front loader 2 Column 3 Swing arm 4 Mounting element 5 Mounting element 6 Swivel bearing 7 Swivel axis 8 Actuator 9 Hydraulic cylinder 10 Beam 11 Beam 12 Swing arm swivel bearing 13 Swing arm swivel axis 14 Actuator 15 Hydraulic cylinder 16 Swivel bearing 17 Actuator 18 Hydraulic cylinder 19 Swivel bearing 20 Beam section 21 Beam section 22 Guide device 23 Telescopic degree of freedom 24 Sliding bearing element 25 Sliding bearing plate 26 Actuator 27 Hydraulic cylinder 28 Interior 29 Swivel bearing 30 Piston rod 31 Cylinder housing 32 Swivel bearing 33 Front loader section 34 Crossbar 35 Swivel bearing

Claims

1. Front loader (1) for a working vehicle with a boom (3) comprising beams (10, 11), the front loader (1) comprising two parallel front loader parts (33a, 33b) which are connected to each other via cross struts (34a, 34b) and the two front loader parts (33) each comprising a pillar (2a, 2b) by which the front loader parts (33a, 33b) can each be connected to an assigned mounting console of the working vehicle, wherein a) one beam (10) is telescopable into different telescopic positions by means of a first actuator (26) and ba) the beams (10, 11) are pivotable into different relative pivot positions about a boom pivot bearing (12) by means of a second actuator (14) and the length of the front loader (1) depends both on the telescopic position and on the pivot position, and / or bb) the first actuator (26) is integrated into the beam (10).

2. Front loader (1) of claim 1, wherein the first actuator (26) and / or the or a second actuator (14) are / is embodied as a hydraulic actuator (27; 15).

3. Front loader (1) of one of the preceding claims, wherein a coordination device is provided which coordinates the actuation of the first actuator (26) and of the or a second actuator (14).

4. Front loader (1) of one of the preceding claims, wherein the beam (10) which is telescopable in different telescopic positions by means of the first actuator (26) comprises two telescopable beam parts (20, 21).

5. Front loader (1) of claim 4, wherein the beam parts (20, 21) comprise non-round guide cross-sections.

6. Front loader (1) of claim 4 or 5, wherein the beam parts (20, 21) are telescopably guided by sliding bearing elements (24) arranged between guide cross-sections of the beam parts (20, 21).

7. Working vehicle comprising a mounting console for coupling the working vehicle to a front loader (1) according to one of claims 1 to 6, wherein the working vehicle a) comprises a first connecting line, via which the beam (10) is telescopable in different telescopic positions by means of the first actuator (26), and b) comprises a second connecting line, via which the beams (10, 11) are pivotable about the boom pivot bearing (12) into different pivot positions by means of the or a second actuator (14).

8. Working vehicle system comprising a working vehicle according to claim 7 and a front loader (1) according to one of claims 1 to 6, wherein a) the front loader (1) comprises a pillar (2) which is detachably fastened to the mounting console, and b) the working vehicle and the front loader (1) are connected to each other via the first connecting line and the second connecting line by which the first actuator (26) and the second actuator (14) are actuated.