FR3068859A1 - TRACTED AGRICULTURAL APPARATUS AND METHOD FOR LIFTING MACHINE ELEMENTS - Google Patents

Abstract

The invention relates to a towed work tool comprising a frame (12) with mounted frames (40) pivoting about horizontal axes (38). Rolling wheels (42) and ground-engaging members (16; 30) are arranged on the frames and are accommodated by a freely movable hinge (48) in the working position of the work tool. Frames, wheels, and ground members are pivotable and lifted by linear elements (52). The depth of the elements to be worked on the ground is adjusted by means of a compacting roller (46) and / or of guldage elements (58). The free mobility of the hinge (48) is temporarily prevented in one direction by a support member (60) subjected to a variable force and / or adjustable in a displacement path. The support element is actuated according to the lifting of the frame, the wheels or the elements to work the ground.

Description

Description

The present invention relates to an agricultural work tool towed according to the features of independent claim 1. Furthermore, the invention relates to a method of lifting machine components of a towed agricultural work tool according to the features of independent method claim 12.

Such a working tool is already apparent from document DE 92 13 091 U1. The machine shown here shows a soil working tool in the form of a rotary harrow, which rotary harrow is driven by means of articulated shafts and gear units, said rotary harrow being mounted on a support frame by the through a device with four articulated joints in the form of a parallelogram. To support the device with four articulated joints during a transport operation or during lifting, it is intended to stop it by means of a locking device, in which the hydraulic cylinder serving at the same time as a folding cylinder, a chain stretched diagonally on the rotary harrow, a spring or also cam elements can also be used as a locking device.

However, the blocking devices described therein each have certain drawbacks by which, of course, the transport widths are respected, but the work in the fields is negatively influenced. Thus, the blocking device shown, by means of the folding cylinder, prevents by forced pivoting any free mobility of the rotary harrow both in a movement directed upwards and in a movement directed downwards, that is to say - to say that even when driving in fields where free mobility of the rotary harrow would be desired, this free mobility no longer exists, whereby an adaptation to unevenness of the ground by means of it is no longer assured. Beyond this fact, the power harrow can be damaged and negatively influence work in the fields. On the other hand, in the variant embodiment as a spring or as a cam element, the locking device only becomes active after a certain position of the device with four articulated joints, whereby the rotary harrow first passes into a position lowered or lowered when the support bar is raised, however this has the consequence that, on the one hand, the working depth of the rotary harrow no longer corresponds to the desired working depth and only the power required to drive that -this is greatly increased for a short time whereby elements of the rotary harrow or else gear elements and / or articulated shafts can be damaged.

Thus, the object of the invention is to create a towed agricultural work tool in which free mobility of elements for working the soil and / or sowing guided by means of a joint is ensured in a working position, but in which free mobility of the joint is immediately prevented in at least one direction during any active lifting of the elements to work the soil and / or to sow.

These objects of the invention are achieved by means of a trailed agricultural work tool having the features of independent claim 1 as well as by a process having the features of independent claim 12, in which other advantageous and developed embodiments of the invention will emerge from the dependent claims.

To achieve the objects mentioned, the invention provides a towed agricultural working tool, in particular a soil working tool and / or a drill having the characteristics of claim 1 which is equipped with a central frame on which are mounted laterally side frames capable of pivoting around horizontal pivot axes and / or, in the rear area, a pivoting frame capable of rotating around an axis oriented transversely to the direction of travel as well as, again next to the pivoting frame , side frames capable of pivoting around horizontal pivot axes. Running wheels rolling on the plowing surface as well as elements for working the soil and / or sowing are arranged at least on the lateral frames, in which at least the rolling wheels and / or the elements for working the soil and / or to be sown are housed by a freely movable articulation in a working position of the working tool, and in which the side frames and / or the pivoting frame and / or the running wheels and / or the elements for working the soil and / or to be sown can pivot and be lifted each by means of linear elements, and in which the depth adjustment of the elements to work the soil and / or to sow is carried out by means of a compacting roller associated with these and / or by means of depth guiding elements associated therewith.

In order to create a towed agricultural working tool in which a free mobility of elements for working the soil and / or sowing guided by means of a joint is ensured in a working position, but in which the free mobility of the articulation is immediately prevented in at least one direction during any active lifting of the elements to work the soil and / or to sow, it is intended that the free mobility of the articulation can be temporarily prevented in at least one direction via at least one support element to which a variable force can be applied and / or which is adjustable in a movement path, in which said support element is actuated as a function of the lifting movement of the lateral frame and / or of the swivel frame and / or running wheels and / or elements for working the soil and / or sowing. In order to further improve this, the linear element and said at least one support element can be connected in signal technique by means of a control device and / or their power supply can be connected in series.

In the case of the agricultural working tool, it is in particular a machine for working the soil and / or sowing, in which, in a preferred embodiment, a tool for working the soil and a seed drill or in which elements for working the soil and elements for sowing can be combined. In the case of soil-working elements, it may in particular be mechanically-actuated soil-working elements driven by means of an articulated shaft, such as for example a rotary harrow or a milling machine. plowing or the like.

First, the working tool can have a central frame which carries the components and on which, in the front area thereof, can be mounted a coupling ring and / or a coupling arrow by means of which or of which said working tool can be connected to a towing vehicle, the articulated shaft if necessary necessary for driving the elements for working the soil being also connected to a towing vehicle.

In addition, a storage tank can be mounted on the central frame, which is used to store and transport the seeds or the products to be distributed which must be spread by means of sowing elements. As coulters, disc coulters, fork coulters and plowshares or the like can be used. Beyond this fact, a rolling mechanism can be provided on the central frame, by means of which the working tool can be transported, in which rolling mechanism wheels can be mounted for this purpose on the central frame, which wheels of the rolling mechanism can be used in turn, in addition to a transport step, also to guide in depth the working tool.

In general, the working tool can have different types of construction. Thus, it would be conceivable to mount on the central frame, respectively on the left and on the right, side frames able to pivot on horizontal pivot axes, on which side frames and, if necessary, also on which central frame are mounted at new elements respectively to work the soil and / or to sow. In addition, it would be conceivable to mount a pivoting frame on a central frame by means of axes oriented transversely to the direction of travel, by means of a two-point and / or three-point attachment, on which pivoting frame is mounted again, respectively on the left and on the right, a lateral frame by means of horizontal pivot axes, elements for working the soil and / or for sowing being mounted at least on the lateral frame.

In this case, an embodiment of the working tool by means of a pivoting frame has in particular the advantage that this makes it possible as a general rule to achieve greater working widths of the working tool. Since, in the case of a two-point attachment on the central frame, the pivoting frame can first pivot 90 ° upwards around an axis oriented transversely to the direction of travel, and then the lateral frames can each pivot 90 ° forwards or backwards in a position extending parallel to the direction of travel, around a pivot axis which is situated approximately on their inner end zone and which, in the position where the pivoting frame and / or the side frames are pivoted 90 ° upwards, extends upright, these extend, for example, in a walking position respectively to the left and right side a storage tank associated with the central frame.

At least on the side frames, respectively in the front area or next to them, running wheels are mounted by means of which, on the one hand, the side parts or the side frames are guided along a plowing surface , but by means of which it is also possible to level an uneven working surface, the running wheels can also form an agricultural roller. Both tillage and sowing elements as well as tillage and sowing elements can be mounted downstream of the side frames or, in this case also, pivotably on these by means of a joint, in which the joint can be designed in particular as a device with four articulated joints, for example in the form of a parallelogram. A single axis of rotation oriented transversely to the direction of travel could also serve as an articulation. However, the design as a parallelogram has the advantage that the elements for working the soil and / or sowing are pivoted respectively parallel to a soil surface, which makes it possible to obtain an improved adaptation to the soil by means of the work tool. Beyond this fact, thanks to the arrangement with four articulated joints, no weight of the lateral frame is transmitted to the elements to work the soil and / or to sow which, in turn, has the consequence that a stable operation of these can be guaranteed and that they cannot begin to vibrate. In order to adjust the working depth of the soil working and / or sowing elements, compacting rollers and / or depth guide elements are associated respectively with these, which, in turn, are adjustable relative to the elements to work the soil and / or to sow in the working depth of these. Thus, in particular thanks to the free mobility by means of the articulation relative to the lateral frame, the respective support of the elements to work the soil and / or to sow is done only by means of the compacting roller or else by means of the elements guide in depth which has, in turn, the advantage that no weight of the central frame or the storage tank or the side frame is transmitted to the elements to work the soil and / or sow what we achieves a substantially more constant and uniform working depth.

It should also be noted that, in addition to the connection of the elements for working the soil and / or for sowing, the running wheels can be connected themselves or only to the lateral frames by means of an articulation, in the case of this articulation also, free mobility can be temporarily prevented by means of at least one support element. However, in a preferred embodiment, the running wheels are secured to the side frame in order to thereby obtain an improved leveling of the plowing surface by means of the running wheels.

To rotate or to lift or remove the pivoting frame or the respective side frames and to move these into a transport position and / or a working position, linear elements are arranged respectively between the side frames and the frame central or between the side frames and the pivoting frame and / or between the central frame and the pivoting frames, linear elements which, in particular, are adjustable along the length thereof and which are designed, for example, as jacks working hydraulically or pneumatically or as electric drive mechanisms.

Due to the free mobility of the joint, such a lifting leads to the elements working the soil and / or sowing collapsing, whereby, on the one hand, the working depth is not maintained constant and, in particular in the case of tillage elements which are mechanically actuated, the need for power for actuation greatly increases which can lead, in turn, to them being damaged. To counter this, it is provided according to the invention that the free mobility of said at least one articulation is temporarily prevented in at least one direction, in particular in the direction of movement directed downwards, by the kiss of at least one support element to which a variable force can be applied and / or which is adjustable in a movement path. To this end, said at least one support element can be controlled as a function of raising or lowering of the side frames and / or of the pivoting frame or can be connected in signal technique to the linear elements whereby a command to little near simultaneous support element and linear element is obtained.

In the case of the support element, it can be any kind of actuators, in particular an actuator actuated electrically, pneumatically or hydraulically to which a variable force can be applied and / or which has a adjustable travel path to allow adaptation to different working depths and weights of different equipment variants. Thus, said support element can be a hydraulic or pneumatically actuated actuator which can be controlled via an electrically controllable valve. The controllable valve can be, for example, a conventional solenoid valve or a distributor.

To apply a variable force to the support element, for example a pressure limiting element can be mounted upstream thereof, or it is possible to apply different electrical powers to it, the respective force being greater or equal to the respective weight of the elements to work the soil and / or to sow, the variable adjustment of this force allowing an adaptation to different equipment and weight of the working tool. It is also possible to integrate the latter into the lateral frame or else into a support tube of the lateral frame in order to obtain a compact construction. Beyond this fact, two or more support elements can be associated respectively for example with the lateral frames or with the articulations.

In addition, in particular when two or more support elements are used, their forces can be matched to each other so that the sum of these in turn corresponds to the weight of the elements to work the soil and / or to sow.

In another alternative embodiment, it can also be provided that said at least one support element adjustable in a movement path can occupy different defined or else definable positions. Thus, it can be provided that when working in the fields, when the elements to work the soil and / or to sow are lifted, the latter are maintained in a position which corresponds at least approximately to the respective working depth, while, when moving from a field position to a transport position, the elements for working the soil and / or sowing can be shifted to a position which, for example, is chosen so that it there can be no collision of tillage and / or sowing elements located opposite each other after the folding operation, or else no collision with a storage tank, and that a respective transport width prescribed by law is not exceeded. This is done automatically by means of a control device, said control device being able in turn to control the support element, for example on the basis of a position of a pivoting frame or on the basis of the position of the linear element.

In another embodiment, it can be provided that the linear element disposed between the central frame and the side frames or else that the linear element disposed between the pivoting frame and the side frame is used and to lift or else pivot the side frame and as a support element. To allow for this purpose a free mobility of the joint in a working position, one can provide a mounting by which the linear element is mounted so as to be free of force in the working position. To this end, in an alternative embodiment of the linear element, a corresponding pressure accumulator can be provided as a linear element actuated hydraulically or pneumatically, which can allow movements of the linear element and is correspondingly filled after the start of lifting to avoid unwanted movements, especially sagging. In the case of a pneumatic linear drive mechanism, free mobility can also be guaranteed by compression of the compressed air therein.

In order to ensure that said at least one support element is in the respectively desired position before lifting, it can also be provided that the support elements and the linear elements are mounted in series or else that these are controlled by means of a sequential circuit which means that the linear element does not move until the support element has occupied a desired position or has taken a desired path of movement and / or has established a desired strength. This can be monitored using sensors, for example. In the variant embodiment where the linear elements and the support elements are produced as hydraulic or pneumatic actuators, it is also possible that the sections of these are each matched to one another in such a way that, after having ordered the two, it is first of all the support element which occupies a necessary position by its section, for example smaller.

There may also be a priority command on the working tool so that said at least one support element is always commanded first and that said at least one linear element is commanded thereafter, however, this command can be done by same time or at least approximately the same time.

To identify an uplift, different measuring means, for example angular potentiometers or pressure switches or distance measuring devices or similar measuring means can be mounted on the side frames and / or the soil working elements and / or to sow or on linear elements.

If we have previously described the towed agricultural work tool according to the invention, it should be emphasized on this point explicitly that all of the aspects and variant embodiments which have been explained in relation to this work tool may also relate to or constitute partial aspects of the following process according to the invention. Consequently, if there is a question, in a passage in the description or also in the definitions of the claims, of the agricultural working implement towed according to the invention, this also applies to the method according to the invention. It is the same conversely so that all of the aspects which are explained in relation to the method according to the invention can also constitute partial aspects of the towed agricultural work tool.

To achieve at least some of the partial aspects of the objects mentioned above, the invention thus provides a method for lifting machine components from a towed agricultural working tool, in particular from soil working tools and / or to sow. In the case of machine components, these may in particular be elements for working the soil and / or sowing or running wheels or the like; comprising a central frame on which are laterally mounted lateral frames capable of pivoting around horizontal pivot axes and / or, in the rear area, a pivoting frame capable of rotating around an axis oriented transversely to the direction of travel as well that, again next to the pivoting frame, lateral frames capable of pivoting around horizontal pivot axes, in which running wheels rolling on the plowing surface as well as elements for working the soil and / or sowing are arranged at least on the side frames, in which at least the running wheels and / or the elements for working the soil and / or for sowing are housed by a freely movable articulation in a working position of the working tool, and in which the side frames and / or the pivoting frame and / or the running wheels and / or the elements for working the soil and / or for sowing can pivot and be lifted each by means of elements l and in which the depth adjustment of the elements for working the soil and / or sowing is carried out by means of a compacting roller associated with them and / or by means of depth guiding elements associated with them this.

In order to create a method of lifting machine components which, in particular in a working position, are freely movable relative to a lateral frame and / or supporting frame, the method provides for temporarily preventing the free mobility of the joint in at least one direction, this being achieved by means of at least one support element to which a variable force * can be applied and / or which is adjustable in a displacement path, in which, for this purpose, first detects a lifting movement of a lateral frame and / or of a pivoting frame and / or of rolling wheels and / or of elements for working the soil and / or for sowing, and in which the control of said at least one support element is made as a function of the lifting movement detected.

In the case of the support element, it may be any kind of actuator, in particular an actuator actuated electrically, pneumatically or hydraulically to which a variable force can be applied and / or which has a adjustable travel path to allow adaptation to different working depths and weights of different equipment variants. Thus, said support element can be a hydraulic or pneumatically actuated actuator which can be controlled via an electrically controllable valve. The controllable valve can be, for example, a conventional solenoid valve or a distributor.

To apply a variable force to said at least one support element, for example a pressure limiting element can be mounted upstream thereof, or it is possible to apply different electrical powers thereto, the respective force being greater or equal to the respective weight of the elements to work the soil and / or to sow and / or rolling wheels, the variable adjustment of this force allowing adaptation to different equipment and weight of the working tool. It is also possible to integrate the latter into the lateral frame or else into a support tube of the lateral frame in order to obtain a compact construction. Beyond this fact, two or more support elements can be associated respectively for example with the lateral frames or with the articulations.

In addition, in particular when two or more support elements are used, their forces can be matched to each other so that the sum of these in turn corresponds to the weight of the elements to work the soil and / or to sow.

In order to ensure that said at least one support element is in the respectively desired position before lifting, it can also be provided that the support elements and the linear elements are mounted in series or else that these are controlled by means of a sequential circuit which means that the linear element does not move until the support element has occupied a desired position or has taken a desired path of movement and / or has established a desired strength. This can be monitored using sensors, for example. In the variant embodiment where the linear elements and the support elements are produced as hydraulic or pneumatic actuators, it is also possible that the sections of these are each matched to one another in such a way that, after having ordered the two, it is first of all the support element which occupies a necessary position by its section, for example smaller.

There may also be a priority command on the working tool so that the support element is always controlled first and that said at least one linear element is controlled then, however this command can be done at the same time or at least approximately at the same time.

To identify an uplift, different measuring means, for example angular potentiometers or pressure switches or distance measuring devices or similar measuring means can be mounted on the side frames and / or the soil working elements and / or to sow or on linear elements.

In another alternative embodiment, it can also be provided that said at least one support element adjustable in a movement path can occupy different defined or else definable positions. Thus, it can be provided that when working in the fields, when the elements to work the soil and / or to sow are lifted, the latter are maintained in a position which corresponds at least approximately to the respective working depth, while, when moving from a field position to a transport position, the elements for working the soil and / or sowing can be shifted to a position which, for example, is chosen so that it there can be no collision of tillage and / or sowing elements located opposite each other after the folding operation, or else no collision with a storage tank, and that a respective transport width prescribed by law is not exceeded. This is done automatically by means of a control device, said control device being able in turn to control the support element, for example on the basis of a position of a pivoting frame or on the basis of the position of the linear element.

Hereinafter, examples of embodiments are intended to explain in more detail the invention and its advantages on the basis of the appended figures. The proportions of the individual elements in relation to each other in the figures do not always correspond to the actual proportions because certain forms are represented in a simplified manner and other forms, for better illustration, are represented in enlarged form in relation to d other elements. In the figures:

fig. 1 shows a perspective view of an alternative embodiment of a towed agricultural work tool;

fig. 2A illustrates a side view of the arrangement of running wheels and of elements for working the soil and / or sowing in a working position and of the non-active support element;

fig. 2B illustrates a side view of the arrangement of running wheels and of elements for working the soil and / or sowing in a raised position and of the non-active support element;

fig. 2C shows a side view of the arrangement of running wheels and elements for working the soil and / or sowing in a lowered position when the support element is active;

fig. 2D illustrates a side view of an arrangement of running wheels and elements for working the soil and / or sowing in the raised position when the support element is active;

fig. 3 shows an alternative embodiment of a mounting plan for the hydraulic control of the support elements.

In FIGS. 1 to 3, respectively identical reference numerals are used for elements of the invention which are identical or which have the same effect. In addition, for the sake of clarity, only the reference figures are shown in the individual figures which are necessary for the description of the respective figure. The embodiments shown are only examples showing how the agricultural working implement towed according to the invention as well as the method according to the invention can be designed, and do not constitute a definitive limitation.

The perspective view of Figure 1 shows an alternative embodiment of a towed agricultural work tool 10 in the form of a tool for working the soil and sowing. Said working tool 10 has a central frame 12 which carries the components and to which is associated, in its front zone, a coupling ring 14 intended to connect the working tool 10 to a towing vehicle which is not shown. here. In the embodiment of FIG. 1, a rotary harrow 18 is used as the soil-working element 16, which rotary harrow is in turn driven by an articulated shaft 20 and gear units 22, the articulated shaft 20 being connected, 15 too, to a towing vehicle which is not shown here and extending along said central frame 12 parallel to the running direction 24 before it opens into a unit of gears 22 from which the drive is therefore transmitted, via articulated shafts 20, to other gear units 22 associated with a lateral part 26.

In addition, a storage tank 28 used to store and transport the seeds or products to be distributed which are to be spread by means of sowing elements 30 is associated with the central frame 12. Beyond this fact, wheels of rolling mechanism 32 are associated with the central frame 12 at the rear end, by means of which the working tool can be transported and by means of which the working tool 10 can be guided during a working position but also in its working depth.

In addition, a pivoting frame 36 housed in rotation by means of an axis oriented transversely to the direction of travel 24 is disposed on the central frame 12, in the rear zone thereof, on which the pivoting frame 36 are mounted, respectively to the left and to the right, side frames 40 able to pivot around horizontal pivot axes 38. However, the side frames 40 could also be mounted by means of horizontal pivot axes 38 on the central frame 12.

Upstream of the side frames 40 are mounted respectively a plurality of running wheels 42 by means of which the side frames 40 or else the side parts 26 are guided along a plowing surface and the plowing surface must be leveled. Beyond this fact, downstream of the side frames 40 are still mounted soil-working elements 16 in the form of a rotary harrow 18, which rotary harrow 18 is further composed of what are called tines rotary harrow 46 and a compactor roller 46, as well as a plurality of sowing elements 30 in the form of so-called double disc coulters, the soil-working elements 16 and the sowing elements 30 each forming a unit (see fig. 2). However, it would also be possible to mount on the side frames 40 only soil-working elements 16 or only sowing elements 30. The soil-working elements 16 are movably connected by means of an articulation to said side frame 40, the joint 48 being a parallelogram 50. However, other arrangements with four articulated joints or axes of rotation or similar joints 48 would also be possible.

To lift or rotate the working tool 10 or to lift or rotate the elements to work the soil and / or to sow 16; 30 or else the rolling wheels 42 or else the pivoting frame 38 or the lateral frame 40, linear elements 52 are disposed respectively between the central frame 12 and the pivoting frame 36 as well as between the pivoting frame 36 and the lateral frame 40 However, in the exemplary embodiment of FIG. 1, to remove or else to lift, only the linear elements 52 are used which are arranged between the central frame 12 and the pivoting frame 36, and the others are used to fold the side frames 40 in order to obtain a working width necessary for a transport step.

Other details of the invention will emerge from the side views of the lateral parts 26 of FIGS. 2A to 2D, these being each shown in different positions. The side parts 26 each consist of a side frame 40, on which side frame 40 are first mounted at the front 24, seen in the direction of travel, running wheels 42 rolling on a plowing surface. Downstream of the lateral frames 40 is mounted, in turn, first a soil-working element 16 in the form of a rotary harrow 18 which consists of rotary harrow teeth 44 driven and a compactor roller 46, as well as, following these, one or more elements to be sown 30. Said compacting roller 46 is connected in an adjustable manner in height to the teeth of rotary harrow 44, this possibility of height adjustment making it possible to define respectively the depth of working of the harrow tines 44. To adjust the working depth, there is respectively a template of holes by means of which the depth can be defined respectively by insertion elements. Thus, the working depth of the elements to work the soil 16 is defined respectively by means of the compacting roller 46. The elements to be sown 30 are mounted, for their part, in an adjustable manner in height on a coulter holder 56, the depth of work of these can be kept constant, too, by means of a depth guide member 58 in the form of a roller. Thus, the elements for working the soil and the elements for sowing 16, 30 form a unit, this unit being freely connected to the lateral frame 40 by means of a hinge 48, for example in the form of a parallelogram 50.

However, this free mobility both upwards and downwards would first have the disadvantage that, firstly, when the lateral frames 40 are lifted or pivoted, the elements to work the soil 16 would collapse and would enter the plowing area in an undesirable manner which can lead to the components thereof being damaged and to an undesirable working result (cf. FIGS. 2A and 2B). In order to counter this, it is provided according to the invention to prevent the free mobility of the joint 48 temporarily and in at least one direction, for this purpose being provided, for example, at least one support element 60 which can be applied a variable force and / or a support element 60 which is adjustable in its path of movement (see Figures 2C and 2D). To prevent any movement of subsidence of the elements to work the soil and / or to sow 16; 30, there is additionally a command for said at least one support element 60 as a function of the lifting movements of the lateral frame 40. This means that, as soon as there is a command for the linear element 52, there additionally has a command for said at least one support element 60 (cf. FIG. 3). The support element 60 can be an electrical, hydraulic or pneumatic device or the like, such as a jack or a linear drive mechanism or a screw jack control or the like. In order to obtain a compact construction of the support element 60, this can also be integrated into the lateral frame 40.

An alternative embodiment of a hydraulic control of said at least one support element 60 is shown in FIG. 3. Thus, this first shows the supply elements which, as a general rule, are associated with a traction 62 or else are provided by the latter and which essentially comprise a pump 64 intended to discharge a pressure medium and a pressure limiting element 66 intended to supply a corresponding pressure as well as a signal valve 68, these components may include various (es) other alternative embodiments or components depending on the towing vehicle.

According to Figure 3, four support elements 60 in the form of single-acting cylinders 70 are provided in the assembly which, in turn, are each controlled by means of a valve 72, upstream of this valve 72 being mounted again a pressure limiter 74. This pressure limiter 74 makes it possible to respectively modify the force applied to the support elements 60, this force being defined so that the force produced by means of the support elements 60 is greater than or equal to a weight of the elements to work the soil and / or to sow in order to thus avoid an unwanted subsidence of these.

Beyond this fact, according to FIG. 3, the control of the linear elements 52 designed as double-acting cylinders 76 is also effected by means of a distributor 78 which, in turn, is controlled by the signal valve 68 of the traction unit 62. Between the distributors 78 and the linear elements 52 may be provided in addition a load holding block 80 which serves to prevent uncontrolled movements of the linear elements 52.

Thanks to the series or sequential circuit assembly, represented according to FIG. 3, of the support elements 60 and of the linear elements 52, it is ensured respectively that the support elements 60 are controlled in any active lifting of the elements to be worked. soil and / or sowing 16, 30, a subsidence of the elements to work the soil and / or sowing 16, 30 can thus be prevented correspondingly. This can be further improved by choosing the distributor 78 and the valve 72 so that the resistance in the valve 72 is as low as possible, the support elements 60 being thus controlled first. However, this can also be obtained by the different sections of the support elements 60 produced as single-acting cylinders 70 and linear elements 52 produced as double-acting cylinders 76. Since the single-acting cylinders 70 have a smaller section, these are the first which are put in a desired pressure and, thus, to which a desired force is applied.

In addition, it should be noted that the connection between the valves and the jacks is made respectively by means of connection lines 82 in the case of which it may be, for example, hydraulic lines or pneumatic lines.

The invention has been described with reference to a preferred embodiment. However, it is conceivable for a person skilled in the art to be able to make variations or modifications of the invention without departing from the scope of protection of the claims which follow.

List of reference figures agricultural work tool central frame hitch ring tillage element rotary harrow articulated shaft gear unit running direction side part storage tank sowing element sowing wheel of rolling mechanism axis pivoting frame pivoting axis side frame running wheels power harrow tines compactor roller articulation parallelogram linear element hole pattern coulter holder depth guide element support element traction unit pump pressure limiting element signal valve single acting cylinder pressure limiting valve double-acting cylinder distributor load holding block connection line

Claims (18)

claims 1. Towed agricultural working tool (10), in particular a soil working tool and / or seed drill, comprising a central frame (12) on which lateral frames (40) are mounted laterally capable of pivoting around pivot axes horizontal (38) and / or, in the rear area, a pivoting frame (36) able to rotate about an axis (34) oriented transversely to the direction of travel as well as, again next to the pivoting frame (36) , side frames (40) capable of pivoting around horizontal pivot axes (38), in which rolling wheels (42) rolling on the plowing surface as well as elements for working the soil and / or sowing (16 ; 30) are arranged at least on the side frames (40), in which the running wheels (42) and / or the soil-working and / or sowing elements (16; 30) are housed by a joint (48 ) freely movable in a working position of the working tool (10), and in which the side frames (4 0) and / or the pivoting frame (36) and / or the running wheels (42) and / or the elements for working the soil and / or for sowing (16; 30) can pivot and be lifted each by means of linear elements (52), and in which the depth adjustment of the elements for working the soil and / or sowing (16; 30) is carried out by means of a compacting roller (46) associated with them and / or by means of depth guide elements (58) associated with them, characterized in that the free mobility of the joint (48) can be temporarily prevented in the at least one direction by means of at least one support element (60) to which a variable force can be applied and / or which is adjustable in a movement path, in which said support element (60) is actuated as a function of the lifting movement of the lateral frame (40) and / or the pivoting frame (36) and / or the running wheels (42) and / or the elements for working the soil and / or for sowing (16; 30) . 2. Towed agricultural work tool according to claim 1, characterized in that the articulation (48) is designed as a parallelogram (50). 3. Towed agricultural work tool according to claim 1, characterized in that the linear element (52) and said at least one support element (60) are connected in signal technique by means of a control device and / or their power supply is connected in series. 4. Towed agricultural work tool according to at least one of the preceding claims, characterized in that at least one support element (60) can be applied a variable force which is greater than or equal to the respective weight of the elements working the soil and / or sowing (16; 30) or running wheels (42). 5. Towed agricultural work tool according to at least one of the preceding claims, characterized in that the support element (60) is produced as an actuator actuated electrically and / or hydraulically and / or pneumatically . 6. Towed agricultural work tool according to at least one of the preceding claims, characterized in that a pressure limiting element (74) is mounted upstream of said at least one support element (60) or that different electrical powers can be applied to it. 7. Agricultural work tool towed according to at least one of the preceding claims, characterized in that said at least one support element (60) is integrated into the lateral frame (40). 8. Towed agricultural work tool according to at least one of the preceding claims, characterized in that said linear element (52) and said at least one support element (60) are constituted by an actuator, which actuator is mounted so as to be free of force in both directions of movement in a working position. 9. Towed agricultural work tool according to at least one of the preceding claims, characterized in that the section of the linear element (52) and the section of the support element (60) are chosen so as to that, after having ordered these, it is first the support element (60) which occupies a necessary position. 10. Towed agricultural work tool according to at least one of the preceding claims, characterized in that, to identify an uplift, different measurement means are mounted on the side frames (40) and / or the elements to be worked on. soil and / or to sow (16; 30) or on the linear elements (52). 11. Towed agricultural work tool according to at least one of the preceding claims, characterized in that the support element (60) adjustable in a movement path can occupy different defined positions, in which, when work in the fields, when the tillage and / or sowing elements (16; 30) are lifted, these are kept in a position which corresponds at least approximately to the respective working depth, while, when '' we pass from a field position to a transport position, we pass the elements to work the soil and / or to sow (16; 30) in a position which is independent of the respective working depth, this being done automatically by means of a control device. 12. Method for lifting machine components of a towed agricultural working tool (10), in particular a soil working tool and / or seed drill, comprising a central frame (12) on which lateral frames are mounted laterally (40 ) able to pivot around horizontal pivot axes (38) and / or, in the rear area, a pivoting frame (36) able to rotate around an axis (34) oriented transversely to the direction of travel as well as, again next to the pivoting frame (36), side frames (40) capable of pivoting about horizontal pivot axes (38), in which rolling wheels (42) rolling on the plowing surface as well as elements to working the soil and / or sowing (16; 30) are arranged at least on the side frames (40), in which the running wheels (42) and / or the elements to work the soil and / or sowing (16 ; 30) are housed by a freely movable articulation (48) in a working position of the tool l working (10), and in which the lateral frames (40) and / or the pivoting frame (36) and / or the running wheels (42) and / or the elements for working the soil and / or for sowing ( 16; 30) can pivot and be lifted each by means of linear elements (52), and in which the depth adjustment of the elements for working the soil and / or sowing (16; 30) is carried out by means of a compacting roller (46) associated with them and / or by means of depth guide elements (58) associated with them, said method providing at least the following method steps consisting in: - temporarily preventing the free mobility of the articulation (48) in at least one direction by means of at least one support element (60) to which a variable force can be applied and / or which is adjustable in a travel path, - detecting a lifting movement of the lateral frame (40) and / or the pivoting frame (36) and / or the running wheels (42) and / or the elements for working the soil and / or for sowing (16; 30) , and at - controlling the support element (60) according to a detected lifting movement. 13. Method according to claim 12, characterized in that the linear element (52) and said at least one support element (60) are connected in signal technique by means of a control device and / or their power supply is connected in series. 14. Method according to claim 12 or 13, characterized in that said at least one support element (60) can be produced as an actuator actuated electrically and / or hydraulically and / or pneumatically. 15. Method according to any one of claims 12 to 14, characterized in that a pressure limiting element (74) is mounted upstream of said at least one support element (60) or that different electrical powers can be applied to it. 5 16. Method according to any one of claims 12 to 15, characterized in that, to identify an uplift, different measuring means are mounted on the side frames (40) and / or the elements to work the soil and / or to be sown (16; 30) or on the linear elements (52). 17. Method according to any one of claims 12 to 16, characterized in that the latter comprises a priority command. 18. Method according to any one of claims 12 to 17, characterized in that the support element (60) adjustable in a displacement path can occupy different defined positions, in which, when working in the fields, when the elements to work the soil and / or to sow (16; 30) are raised, these are maintained in a 15 position which corresponds at least approximately to the respective working depth, while, when moving from a field position to a transport position, the elements for working the soil and / or sowing (16; 30) in a position which is independent of the respective working depth, this being done automatically by means of a control device.