SE2050612A1

SE2050612A1 - An outdoor media transporting cable fastner

Info

Publication number: SE2050612A1
Application number: SE2050612A
Authority: SE
Inventors: Gerhard Werner
Original assignee: Husqvarna Ab
Priority date: 2020-05-28
Filing date: 2020-05-28
Publication date: 2021-11-29
Also published as: SE544584C2; DE102021112406A1

Abstract

The present disclosure relates to an outdoor media transporting cable fastener (11) adapted for fastening an outdoor media transporting cable (5) onto a ground surface (13). Each outdoor media transporting cable fastener (11) comprises at least one end (26a, 26b) that is adapted to be inserted into the ground through the ground surface (13). Each boundary wire fastener (11) is made of a biodegradable material that is constituted by flexible fibers.

Description

TITLE An outdoor media transporting cable fastener TECHNICAL FIELDThe present disclosure relates to an outdoor media transporting cable fastener adapted for fastening an outdoor media transporting cable onto a ground surface, BACKGROUND Robotic work tool systems of different configurations which use a boundary wire areavailable on the market today. A common example is a robotic lawn mower. Aboundary wire is a wire comprising an electrical conductor usually protected by a cover.ln most systems, a signal emitting unit is connected to the boundary wire and outputsa signal through the boundary wire such that one or more sensors of the robotic worktool of the robotic work tool system can sense the location of the boundary wire and inresponse thereto navigate the robotic work tool.

By fastening the boundary wire around edges of an area, a user can define and controlwhich area that is going to be operated by the robotic work tool. The boundary wirecan be fastened onto the ground using boundary wire fasteners, such as staples.

One of the reasons why robotic work tool systems have become increasingly popularand common is that they are able to autonomously perform a burdensome task, such as cutting a lawn, without the intervention of a user.

Most robotic work tools comprise one or more batteries and one or more driving unitsbeing powered by the one or more batteries. Thus, such a robotic work tool can performa task in an environmentally friendly manner, using electric power. ln some cases, therobotic work tool uses the boundary wire to locate a charging station used to rechargethe one or more batteries.

Even though robotic work tool systems usually can operate and perform a task in anenvironmentally friendly manner, there is room for improvement. Further, in mostcases, the staples are difficult to remove from the ground surface when the boundary wire is to be removed or moved. ln the same way, for example water hoses for garden watering systems and otheroutdoor media transporting cables also need to be fastened to the ground in a similar manner, imposing similar problems.

SUMMARY The object of the present disclosure is to provide an improved outdoor mediatransporting cable fastener.

This object is achieved by means ofoutdoor media transporting cable fastener adaptedfor fastening an outdoor media transporting cable onto a ground surface. Each outdoormedia transporting cable fastener comprises at least one end that is adapted to beinserted into the ground through the ground surface, and is made of a biodegradable material that is constituted by flexible fibers. ln this way, an environment-friendly, inexpensive and easily handled outdoor mediatransporting cable fastener that need not be removed is provided.

According to some aspects, the outdoor media transporting cable fastener is a waterhose fastener that is adapted for fastening a water hose onto the ground surface.

According to some aspects, the outdoor media transporting cable fastener is aboundary wire fastener adapted for fastening a boundary wire, configured to provide aboundary of a working area of an outdoor robotic work tool, onto the ground surface.

This means that the outdoor media transporting cable fastener can be used for fastening different kinds of outdoor media transporting cables.

According to some aspects, the biodegradable material is made by fibers forming a woven or non-woven fabric.

According to some aspects, the biodegradable material is made by a cellulose fibersheet material.

According to some aspects, the biodegradable material is made by fibers forming a twine.

This means that the biodegradable material can be made in many different waysaccording to needs and requirements.

According to some aspects, at least one end that is adapted to be inserted through theground surface has an arrow-shape or a T-shape. ln this way, each outdoor media transporting cable fastener can be securely fixed inthe ground.

According to some aspects, the outdoor media transporting cable fastener iscomprised in a plurality of outdoor media transporting cable fasteners that are attachedto a holding sheet that is arranged in a roll from which an end of the holding sheet canbe unrolled. ln this way, an automated mounting of the outdoor media transporting cable fastenersis enabled.

According to some aspects, each outdoor media transporting cable fastener comprisesan aperture enabling a loop to be formed, the loop being adapted to circumvent theoutdoor media transporting cable.

According to some aspects, the media transporting cable fastener comprises a loop,the loop being adapted to circumvent the outdoor media transporting cable.

This means that the media transporting cable fastener can be attached to the outdoormedia transporting cable in many different ways according to needs and requirements.

According to some aspects, the biodegradable material is arranged to decompose afterone to five years when the outdoor media transporting cable fastener has been insertedinto the ground through the ground surface. ln this manner, it is ensured that the media transporting cable fasteners do not need to be removed and do not affect the environment in any negative manner.

The present disclosure also relates to boundary wire arrangements, fastening toolsand methods that are associated with above advantages.

BRIEF DESCRIPTION OF THE DRAWINGSThe present disclosure will now be described more in detail with reference to theappended drawings, where: Figure 1 shows a schematic top view of a lawn mower; Figure 2 shows a schematic front view of a lawn mower; Figure 3 shows a schematic bottom view of a lawn mower; Figure 4 schematically illustrates a boundary wire arrangement for an outdoorrobotic work tool system; Figure 5A schematically illustrates a first example of an outdoor media transportingcable fastener; Figure 5B schematically illustrates the outdoor media transporting cable fasteneraccording to Figure 5A with a loop; Figure 6A schematically illustrates an end of the outdoor media transporting cablefastener according to Figure 5B about to be inserted into the ground; Figure 6B schematically illustrates the outdoor media transporting cable fasteneraccording to Figure 5B having been mounted to the ground; Figure 6C schematically illustrates an alternative to Figure 6B; schematically illustrates a second example of an outdoor media transporting cable fastener; Figure 7 schematically illustrates an end of the outdoor media transporting cablefastener according to Figure 7 about to be inserted into the ground; Figure 8B schematically illustrates the outdoor media transporting cable fasteneraccording to Figure 7 having been mounted to the ground; Figure 9A schematically illustrates the ends of an outdoor media transporting cablefastener according to a third example about to be inserted into the ground; Figure 9B schematically illustrates the outdoor media transporting cable fastener according to Figure 9A having been mounted to the ground; Figure 10 schematically illustrates a plurality of outdoor media transporting cablefasteners attached to a holding sheet; Figure 11 schematically illustrates the holding sheet according to Figure 10 arrangedin a roll, the outdoor media transporting cable fasteners being mounted bymeans of a mounting tool according to a first example; Figure 12 schematically illustrates a front view of Figure 11 with depressed pressing rod; Figure 13A schematically illustrates a mounting tool according to a second example in a first position; Figure 13B schematically illustrates a mounting tool according to a second example in a second position; Figure 13C schematically illustrates a mounting tool according to a second example in a third position; and Figure 14 shows a flowchart for methods according to the present disclosure.DETAILED DESCRIPTION Aspects of the present disclosure will now be described more fully hereinafter withreference to the accompanying drawings. The different devices, systems, computerprograms and methods disclosed herein can, however, be rea|ized in many differentforms and should not be construed as being limited to the aspects set forth herein. Likenumbers in the drawings refer to like elements throughout.

The terminology used herein is for describing aspects of the disclosure only and is notintended to limit the invention. As used herein, the singular forms "a", "an" and "the"are intended to include the plural forms as well, unless the context clearly indicates otherwise. lt should be noted that even though the description given herein will be focused onrobotic lawn mowers, the teachings herein may also be applied to any type of outdoorrobotic work tool, such as for example robotic ball collectors, robotic mine sweepers and robotic farming equipment.

Figure 1 shows a top view of an outdoor robotic working tool 1, Figure 2 shows a frontview of the outdoor robotic working tool 1 and Figure 3 shows a bottom view of theoutdoor robotic working tool 1, here exemplified by a robotic lawn mower 9. The roboticlawn mower 9 comprises a body 20a, 20b, a propulsion motor arrangement 15, a powersource 16 such as a rechargeable battery adapted to provide power to the propulsionmotor arrangement 15, and a plurality of wheels 10a, 10b; 21a, 21b. Two or more ofthe wheels, according to some aspects two rear wheels 21a, 21b, are adapted to bepropelled by the propulsion motor arrangement 15, enabling the robotic working tool 1to move with respect to a forward travelling direction D. lt is of course possible that allfour wheels 10a, 10b; 21a, 21b are adapted to be propelled by the propulsion motor arrangement 15.

The robotic lawn mower 9 also comprises a grass cutting device 23, in this example aplurality of cutting blade arrangements driven by a cutter motor arrangement 22 that also is powered by the power source 16 or, alternatively, by a separate power source.

The grass cutting device is an example of a general work tool for an outdoor robotic work tool.

According to some aspects, the propulsion motor arrangement 15 comprises oneseparate propulsion motor for each wheel 10a, 10b; 21a, 21b to be driven, andaccording to some further aspects, the cutter motor arrangement 22 comprises oneseparate cutter motor for each cutting blade arrangement. lt should be noted that even if the description herein is focused on electric motors,combustion engines may alternatively be used, possibly in combination with an electric motor.

The robotic lawn mower 9 further comprises a control unit 19. The robotic lawn mower9 may be a multi-chassis type or a mono-chassis type. A multi-chassis type comprisesmore than one body parts that are movable with respect to one another. A mono-chassis type comprises only one main body part. ln this example there is a front bodypart 20a and a rear body part 20b.

The robotic lawn mower 9 typically comprises charging skids 28 for contacting contactplates in a charging station when docking into the charging station for receiving acharging current through, and possibly also for transferring information by means ofelectrical communication between the charging station and the robotic lawn mower 9.Other means of establishing a charging contact are possible and are incorporated herein. ln a previously well-known manner, the robotic lawn mower 9 is adapted to navigatewith reference to a boundary wire emitting a magnetic field caused by a control signaltransmitted through the boundary wire. The robotic lawn mower is further configuredto detect the magnetic field and for detecting the boundary wire, for example by means of one or more magnetic field sensors.

Figure 4 illustrates a boundary wire arrangement 1 for an outdoor robotic work toolsystem 3. According to the illustrated embodiments, the outdoor robotic work toolsystem 3 comprises the robotic lawn mower 9 configured to autonomously cut grass of a lawn 15. The boundary wire arrangement 1 comprises a boundary wire 5configured to provide a boundary of a working area 7 of the robotic lawn mower 9.According to the illustrated embodiments, the working area 7 is a portion of the lawn15.

Further, according to the illustrated embodiments, the boundary wire 5 is connected toa signal emitting unit 16. The signal emitting unit 16 is configured to emit a signalthrough the boundary wire 5. The robotic lawn mower 9 comprises a sensor 17configured to sense the location of the boundary wire 5, and the control unit 19 isconfigured to navigate the robotic lawn mower 9 on the basis of the location of theboundary wire 5. The robotic lawn mower 9 thus uses the sensor 17 to locate the boundary wire 5 and thereby the boundary of the working area 7.

According to the illustrated embodiments, the sensor 17 senses the location of theboundary wire 5 by sensing the magnetic field of the boundary wire 5. Further, therobotic lawn mower 9 may also comprise other types of positioning units and sensors,for example sensors for detecting an event, such as a collision with an object within the working area 7.

Further, the robotic lawn mower 9 may comprise a photovoltaic module arranged togenerate electricity from the sun's rays which may fully or partially provide an energysource for charging the one or more batteries. The robotic lawn mower 9 may move ina systematic and/or random pattern to ensure that the working area 7 is completelyoperated. ln addition, the robotic lawn mower 9 may use the boundary wire 5 to locatea charging station used to recharge the one or more batteries. The charging station may be located at, form part of, or comprise, the signal emitting unit 16.

The boundary wire arrangement 1 comprises a plurality of boundary wire fasteners 11for fastening the boundary wire 5 onto a ground surface 13. As mentioned above,according to the illustrated embodiments, the ground surface 13 is a lawn 15. ln Fig.1, only some of the boundary wire fasteners 11 are indicated with the reference sign"1 1" for the reason of brevity and/or clarity. As shown in Figure 5A and Figure 5B, eachfastener 11 comprises a first end 26a that is adapted to be inserted into the ground through the ground surface 13.

According to the present disclosure, each of the boundary wire fasteners 11 is madeof a biodegradable material that is constituted by flexible fibers. Examples of suchmaterials are woven and non-woven fabric, twine, cellulose fiber material such as different types of paper.

As shown in Figure 5A and Figure 5B, a first example of a fastener 111 is made of astrip of sheet material where an aperture 27 is arranged and enables a loop 28 to beformed, according to some aspects in the proximity of a second end 39. The loop isadapted to circumvent the boundary wire 5. The strip of sheet material is according tosome aspects formed by woven or non-woven fabric 25, or, alternatively, by a cellulosefiber sheet material .31 As shown in Figure 6A and Figure 6B, a tool 33 is used to press the first end 26a intothe ground through the ground surface 13 such that the loop 28 with the encircledboundary wire 5 remains above the ground surface 13. As shown in Figure 6C, in orderto provide a more secure attachment of the fastener 11'1 in the ground, the first end 26a is provided an arrow-shape or a T-shape.

As shown in Figure 7, a second example of a fastener 112 is made of a strip of sheetmaterial as mentioned above, or by a fibers forming a twine, and here a loop 29 isalready formed at a second end 40, and the boundary wire 5 is thread through the loop29. According to some aspects, boundary wire 5 can be provided to a user with aplurality of pre-thread fasteners 112.

As shown in Figure 8A and Figure 8B, a tool 33 is used to press the first end 26a intothe ground through the ground surface 13 such that the loop 29 with the encircledboundary wire 5 remains above the ground surface 13.

As shown in Figure 9A, a third example of a fastener 113 is made of a strip of sheetmaterial or by a fibers forming a twine, as mentioned above, and here there is no loop.lnstead both a first end 26a and a second end 26b are arranged to be pressed into theground through the ground surface 13. The fastened 113 is thus arranged roughlyperpendicular above the boundary wire 5, the boundary wire 5 passing roughly at a middle part of the fastener 113. One or two tools 33 are used for pressing the ends26a, 26b through the ground surface 13 such that a U-shaped fastener 113 is formedaround the boundary wire 5, as illustrated in Figure 9B.

The third example of fastener can be used for automatic or semi-automatic mounting as will be illustrated in the following.

With reference to Figure 10 and Figure 11, illustrating a first mounting example, thereis a plurality of fasteners 113 that are attached to a holding sheet 32 that is arrangedin a roll 30 from which an end of the holding sheet 32 can be unrolled. The fasteners113 are suitably of the kind discussed in the third example above, but other types offasteners are of course conceivable. The mounting is performed by means of afastening tool 34 into which the unrolled end of the holding sheet 32 is fed, and thefastening tool 34 comprises a pressing rod that 38 is adapted to press the ends 26a,26b into the ground, through the surface 13, as shown in Figure 12 such that a U-shaped fastener 1 13 is formed around the boundary wire 5, as illustrated also in Figure9B.

When pressing the pressing rod 38, the fastener 113 that presently is pressed into theground surface 13 is released from the holding sheet 32, and when releasing thepressing rod 38, the mounting position is advanced such that the next fastener 113 inturn is positioned for being pressed into the ground surface 13 at the next mountingoccasion. The fastening tool 34 is here moved along the boundary wire 5.

The roll 30 is shown separate from the fastening tool 34, but can be comprised in thefastening tool 34 as well.

According to some aspects, the pressing rod 38 comprises two separate pressingmembers 47a, 47b, each pressing member 47a, 47b being adapted to press acorresponding outer ends 26a, 26b into the ground.

With reference to Figure 13A-13C, illustrating a second mounting example, there is aroll 41 of fastener material 114, suitable a twine, but other types of fastener materials 11 such as sheet materials are of course conceivable. The roll 41 is attached to a fastening tool 42 that comprises a pressing rod 43 and a cutting tool 44. ln Figure 13A, a first depression 45 of the fastener material 114 has been made, andthe fastening tool 42 has been moved across a boundary wire 5 such that a seconddepression can be made at another side of the boundary wire 5. ln Figure 13B, thepressing rod 43 is depressed such that a second depression 46 of the fastener material114 is made, and the boundary wire 5 is then pressed against the ground surface 13by the fastener material 114 between the depressions 44, 45. ln Figure 13C, the pressing rod 43 has been released and cutting tool depressed suchthat the fastener material 114 is cut of downstream the depressions 44, 45. Thefastening tool 42 can now be moved along the boundary wire 5 and positioned forcreating a new first depression, second depression and so on. ln this manner a quiteuncomplicated fastener such as a roll of twine can be used and easily applied.

According to some aspects, the biodegradable material is made by fibers forming a woven or non-woven fabric 25, or by a cellulose fiber sheet material 31.

According to some aspects, the biodegradable material is made by fibers forming atwine 24.

According to some aspects, the biodegradable material is arranged to decompose afterone to five years when the outdoor media transporting cable fastener 11 has beeninserted into the ground through the ground surface 13.

According to some aspects, although the fastener 11 has been described as beingadapted for fastening a boundary wire 5, configured to provide a boundary of a workingarea 7 of an outdoor robotic work tool 9, onto the ground surface 13, the fastenersaccording to the present disclosure can alternatively be used for any outdoor media transporting cable such as one or more water hoses in a watering system.

Generally, the present disclosure thus relates to an outdoor media transporting cablefastener 11 adapted for fastening an outdoor media transporting cable 5 onto a ground 12 surface 13, where each outdoor media transporting cable fastener 11 comprises atleast one end 26a, 26b that is adapted to be inserted into the ground through theground surface 13. Each outdoor media transporting cable fastener 11 is made of a biodegradable material that is constituted by flexible fibers.

According to some aspects, the outdoor media transporting cable fastener is a waterhose fastener that is adapted for fastening a water hose onto the ground surface 13.

According to some aspects, the outdoor media transporting cable fastener is aboundary wire fastener 11 adapted for fastening a boundary wire 5, configured toprovide a boundary of a working area 7 of an outdoor robotic work tool 9, onto the ground surface 13.

Generally, the present disclosure also relates a boundary wire arrangement 1 for anoutdoor robotic work tool system 3, wherein the boundary wire arrangement 1comprises:- a boundary wire 5 configured to provide a boundary of a working area 7 of anoutdoor robotic work tool 9, and- a plurality of boundary wire fasteners 11 adapted for fastening the boundarywire 5 onto a ground surface 13,wherein each boundary wire fastener 11 is made of a biodegradable material that isconstituted by flexible fibers.

According to some aspects, a plurality of boundary wire fasteners 11 are attached to aholding sheet 32 that is arranged in a roll 30 from which an end of the holding sheet 32 can be unrolled.

According to some aspects, the boundary wire arrangement 1 comprises a fasteningtool 33 into which the unrolled end of the holding sheet 32 can be fed, where thefastening tool 33 is adapted to press the ends 26a, 26b, adapted to be inserted intothe ground, through the ground surface 13 According to some aspects, the boundary wire arrangement 1 comprises a fasteningtool 33 that comprises a roll 41 of fastener material 114, a pressing rod 43 and a cutting 13 tool 44, where the pressing rod 43 is adapted to press the fastener material 114 intothe ground through the ground surface 13 at both sides of the boundary wire 5 suchthat two depressions 44, 45 are formed, and where the a cutting tool 44 is adapted forcutting the fastener material 114 downstream the depressions 44, 45.

According to some aspects, the outdoor robotic work tool 1 is a robotic lawn mower.

With reference to Figure 14, the present disclosure relates to a method for fasteningan outdoor media transporting cable 5 onto a ground surface 13 using outdoor mediatransporting cable fasteners 11, 111, 112, 113, 114, where each outdoor mediatransporting cable fastener 11, 111, 112, 113, 114 is made of a biodegradable materialthat is constituted by flexible fibers. The method comprises positioning S100 theoutdoor media transporting cable 5 onto the ground surface 13 and pressing S400 atleast one end 26a, 26b of each outdoor media transporting cable fastener 11, 111, 112,113, 114 into the ground through the ground surface 13 using a pressing tool 33, 34,42 such that the outdoor media transporting cable 5 is pressed against the groundsurface 13 by means of the outdoor media transporting cable fasteners 11, 111, 112,113, 114.

According to some aspects, the method further comprises forming S200 a loop 28 ineach outdoor media transporting cable fastener 111.

According to some aspects, the method further comprises attaching S300 the outdoormedia transporting cable 5 to a loop 28, 29 comprised in each outdoor mediatransporting cable fastener 111, 112.

The present disclosure also relates to a fastening tool 34, 42 adapted for insertingoutdoor media transporting cable fasteners 11, 111, 112, 113, 114 into the groundthrough the ground surface 13, the fastening tool 34, 42 comprising a pressing rod 38that is adapted to press outer ends 26a, 26b of outdoor media transporting cablefasteners11, 111, 112, 113, 114 into the ground, through a ground surface 13, such thatan outdoor media transporting cable 5 positioned between the outer ends 26a, 26bcan be fastened onto the ground surface 13. 14 According to some aspects, the fastening tool 34 is adapted to receive a holding sheet32 where a plurality of outdoor media transporting cable fasteners 113 are attached tothe holding sheet 32.

According to some aspects, the holding sheet 32 is arranged in a roll 30 that iscomprised in the fastening tool 34, from which roll 30 an end of the holding sheet 32 can be unrolled.

According to some aspects, the outdoor media transporting cable fasteners 113 thatare attached to the holding sheet 32 are made of a biodegradable material that isconstituted by flexible fibers.

According to some aspects, the fastening tool 42 comprises a roll 41 of fastenermaterial 114, a pressing rod 43 and a cutting tool 44, where the pressing rod 43 isadapted to press the fastener material 114 into the ground through the ground surface13 at both sides of the outdoor media transporting cable 5 such that two depressions44, 45 are formed for the fastener material 114, and where the a cutting tool 44 is adapted for cutting the fastener material 114 downstream the depressions 44, 45.

According to some aspects, the fastener material 114 is made of a biodegradablematerial that is constituted by flexible fibers.

According to some aspects, the fastener material 114 is a twine.

The present disclosure is not limited to the above, but may vary freely within the scopeof the appended claims. For example, the general term biodegradable material can inpractice be constituted by two or more different biodegradable materials that areseparately arranged or mixed. For example, a loop of a fastener according to thepresent disclosure may be made in one biodegradable material and the rest of thefastener can be made in another biodegradable material. That each outdoor mediatransporting cable fastener 11 is made of a biodegradable material that is constitutedby flexible fibers should be interpreted as each outdoor media transporting cablefastener 11 being made solely of such a material.

According to some aspects, for the fastening tool 42 according to the second mountingexample, the fastener material is not cut, but can be positioned across the groundsurface 13 in a zig-zag patter.

According to some aspects, each outdoor media transporting cable fastener can be tied to, or twisted around, the outdoor media transporting cable.

Claims

1. An outdoor media transporting cable fastener (11) adapted for fasteningan outdoor media transporting cable (5) onto a ground surface (13), where eachoutdoor media transporting cable fastener (11) comprises at least one end (26a, 26b)that is adapted to be inserted into the ground through the ground surface (13), whereineach outdoor media transporting cable fastener (11) is made of a biodegradablematerial that is constituted by flexible fibers.

2. The outdoor media transporting cable fastener (11) according to claim 1,wherein the outdoor media transporting cable fastener is a water hose fastener that isadapted for fastening a water hose onto the ground surface (13).

3. The outdoor media transporting cable fastener (11) according to claim 1,wherein the outdoor media transporting cable fastener is a boundary wire fastener (11)adapted for fastening a boundary wire (5), configured to provide a boundary of aworking area (7) of an outdoor robotic work tool (9), onto the ground surface (13).

4. The outdoor media transporting cable fastener(1 11, 112, 113) according toany one of the previous claims, wherein the biodegradable material is made by fibers forming a woven or non-woven fabric (25).

5. The outdoor media transporting cable fastener (1 1 1, 112, 113) according toany of the claims 1-3, wherein the biodegradable material is made by a cellulose fibersheet material (31).

6. The outdoor media transporting cable fastener (112,113) according to anyof the claims 1-3, wherein the biodegradable material is made by fibers forming a twine(24).

7. The outdoor media transporting cable fastener (1 1'1) according to any oneof the previous claims, wherein at least one end (26a') that is adapted to be insertedthrough the ground surface (13) has an arrow-shape or a T-shape.

8. The outdoor media transporting cable fastener (11) according to any oneof the previous claims, wherein the outdoor media transporting cable fastener (113) iscomprised in a plurality of outdoor media transporting cable fasteners (113) that areattached to a holding sheet (32) that is arranged in a roll (30) from which an end of theholding sheet (32) can be unrolled.

9. The outdoor media transporting cable fastener (1 11) according to any oneof the claims 1-7, wherein each outdoor media transporting cable fastener (111)comprises an aperture (27) enabling a loop (28) to be formed, the loop (28) being adapted to circumvent the outdoor media transporting cable (5).

10. The outdoor media transporting cable fastener (1 12) according to any oneof the claims 1-7, wherein the media transporting cable fastener (1 12) comprises a loop (29), the loop (29) being adapted to circumvent the outdoor media transporting cable

11. The outdoor media transporting cable fastener (11) according to any oneof the previous claims, wherein the biodegradable material is arranged to decomposeafter one to five years when the outdoor media transporting cable fastener (11) hasbeen inserted into the ground through the ground surface (13).

12. A boundary wire arrangement (1) for an outdoor robotic work tool system(3), wherein the boundary wire arrangement (1) comprises:- a boundary wire (5) configured to provide a boundary of a working area (7) ofan outdoor robotic work tool (9), and- a plurality of boundary wire fasteners (11, 111, 112, 113, 114) adapted forfastening the boundary wire (5) onto a ground surface (13),wherein each boundary wire fastener (11, 111, 112, 113, 114) is made of abiodegradable material that is constituted by flexible fibers.

13. The boundary wire arrangement (1) according to claim 12, wherein the biodegradable material is made by a woven or non-woven fabric (25).

14. The boundary wire arrangement (1) according to claim 12, wherein the biodegradable material is made by fibers forming a twine (24).

15. The boundary wire arrangement (1) according to claim 12, wherein thebiodegradable material is made by a cellulose fiber sheet material (31).

16. The boundary wire arrangement (1) according to any one of the claims12-15, wherein each boundary wire fastener (11, 111, 112, 113, 114) comprises at leastone end (26a, 26b) that is adapted to be inserted into the ground, through the groundsurface (13).

17. The boundary wire arrangement (1 ) according to claim 16, wherein at leastone end (26a') that is adapted to be inserted through the ground surface (13) has an arrow-shape or a T-shape.

18. The boundary wire arrangement (1) according to any one of the claims12-17, wherein a plurality of boundary wire fasteners (113) are attached to a holding sheet(32) that is arranged in a roll (30) from which an end of the holding sheet (32) can be unrolled.

19. The boundary wire arrangement (1) according to claim 18, wherein theboundary wire arrangement (1) comprises a fastening tool (34) into which the unrolledend of the holding sheet (32) can be fed, where the fastening tool (34) comprises apressing rod (38) that is adapted to press the ends (26a, 26b), adapted to be insertedinto the ground, through the ground surface (13).

20. The boundary wire arrangement (1) according to any one of the claims 12-16, wherein the boundary wire arrangement (1) comprises a fastening tool (42) thatcomprises a roll (41) of fastener material (114), a pressing rod (43) and a cutting tool(44), where the pressing rod (43) is adapted to press the fastener material (114) intothe ground through the ground surface (13) at both sides of the boundary wire (5) suchthat two depressions (44, 45) are formed for the fastener material (114), and where thea cutting tool (44) is adapted for cutting the fastener material (114) downstream the depressions (44, 45).

21. The boundary wire arrangement (1) according to claim 20, wherein the roll(41) of fastener material (114) is a roll of tvvine.

22. The boundary wire arrangement (1) according to any one of the claims 12-17, wherein a plurality of boundary wire fasteners (111) comprises an aperture (27)enabling a loop (28) to be formed, the loop (28) being adapted to circumvent theboundary wire (5).

23. The boundary wire arrangement (1) according to any one of the claims 12-17, wherein a plurality of boundary wire fasteners (112) comprises a loop (29), the loop(29) being adapted to circumvent the boundary wire (5).

24. The boundary wire arrangement (1) according to any one of the claims 12-23, wherein the the biodegradable material is arranged to decompose after one to fiveyears when the boundary wire fasteners (11, 111, 112, 113, 114) have been insertedinto into the ground through the ground surface (13).

25. The outdoor robotic work tool (1) according to any one of the claims 12-24, wherein the outdoor robotic work tool (1) is a robotic lawn mower.

26. A method for fastening an outdoor media transporting cable (5) onto aground surface (13) using outdoor media transporting cable fasteners (11, 111, 112,113, 114), where each outdoor media transporting cable fastener (11, 111, 112, 113,114) is made of a biodegradable material that is constituted by flexible fibers, whereinthe method comprises: positioning (S100) the outdoor media transporting cable (5) onto theground surface (13); pressing (S400) at least one end (26a, 26b) of each outdoor mediatransporting cable fastener (11, 111, 112, 113, 114) into the ground through the groundsurface (13) using a pressing tool (33, 34, 42) such that the outdoor media transportingcable (5) is pressed against the ground surface (13) by means of the outdoor mediatransporting cable fasteners (11, 111, 112, 113, 114).

27. The method according to claim 26, wherein the method further comprises forming (S200) a loop (28) in each outdoor media transporting cable fastener (111).

28. The method according to any one of the claims 26 or 27, wherein themethod further comprises attaching (S300) the outdoor media transporting cable (5) to a loop (28, 29) comprised in each outdoor media transporting cable fastener(1 11, 112).

29. A fastening tool (34, 42) adapted for inserting outdoor media transportingcable fasteners (1 1, 111, 112, 113, 114) into the ground through the ground surface (13),the fastening tool (34, 42) comprising a pressing rod (38) that is adapted to press outerends (26a, 26b) of outdoor media transporting cable fasteners (11, 111, 112, 113, 114)into the ground, through a ground surface (13), such that an outdoor media transportingcable (5) positioned between the outer ends (26a, 26b) can be fastened onto the ground surface (13).

30. The fastening tool (34) according to claim 29, wherein the pressing rod(38) comprises two separate pressing members (47a, 47b), each pressing member(47a, 47b) being adapted to press a corresponding outer ends (26a, 26b) into theground.

31. The fastening tool (34) according to any one of the claims 29 or 30,wherein the fastening tool (34) is adapted to receive a holding sheet (32) where aplurality of outdoor media transporting cable fasteners (1 13) are attached to the holdingsheet (32).

32. The fastening tool (34) according to claim 31, wherein the holding sheet(32) is arranged in a roll (30) that is comprised in the fastening tool (34), from whichroll (30) an end of the holding sheet (32) can be unrolled.

33. The fastening tool (34) according to claim 32, wherein the outdoor mediatransporting cable fasteners (113) that are attached to the holding sheet (32) are madeof a biodegradable material that is constituted by flexible fibers.

34. The fastening tool (42) according to claim 29, wherein the fastening tool(42) comprises a roll (41) of fastener material (114), a pressing rod (43) and a cuttingtool (44), where the pressing rod (43) is adapted to press the fastener material (114)into the ground through the ground surface (13) at both sides of the outdoor mediatransporting cable (5) such that two depressions (44, 45) are formed for the fastenermaterial (114), and where the a cutting tool (44) is adapted for cutting the fastenermaterial (114) downstream the depressions (44, 45).

35. The fastening tool (42) according to claim 34, wherein the fastener material 114 is made of a biodegradable material that is constituted by flexible fibers.

36. The fastening tool (42) according to claim 35, wherein the fastener material 114 is a twine.

37. The fastening tool (34, 42) according to any one of the claims 29-36,wherein each outdoor media transporting cable fastener is a boundary wire fastener(11) adapted for fastening a boundary wire (5), configured to provide a boundary of a working area (7) of an outdoor robotic work tool (9), onto the ground surface (13).