AU2019205011A1 - A System for use in Pulling a Conduit - Google Patents

Abstract

The invention proposes a system for use in pulling a conduit/cable, and the system includes an anchor sub assembly, and a winching sub-assembly. The anchor sub-assembly includes an anchor frame with tines whose lower ends that can engage with the ground, and mounts for mounting the anchor sub-assembly on a first end of a vehicle. The winching sub-assembly includes a winching frame mountable on a second end of the vehicle, a drum mounted on the frame so to be rotatable for winding the winching line, and a motor is connected with the drum. When the system is pulling the conduit/cable, the winching sub-assembly drives the motor to wind the winching line (coupled to the conduit/cable) onto the drum, and the anchor sub-assembly resists movement of the vehicle in a direction opposite to pulling direction of the conduit by the tines biting into the ground. FIG. 1 -1113 0 '-I0 1 CAA

Description

The invention proposes a system for use in pulling a conduit/cable, and the system includes an anchor sub assembly, and a winching sub-assembly. The anchor sub-assembly includes an anchor frame with tines whose lower ends that can engage with the ground, and mounts for mounting the anchor sub-assembly on a first end of a vehicle. The winching sub-assembly includes a winching frame mountable on a second end of the vehicle, a drum mounted on the frame so to be rotatable for winding the winching line, and a motor is connected with the drum. When the system is pulling the conduit/cable, the winching sub-assembly drives the motor to wind the winching line (coupled to the conduit/cable) onto the drum, and the anchor sub-assembly resists movement of the vehicle in a direction opposite to pulling direction of the conduit by the tines biting into the ground.

FIG. 1

0

'-I0 1 CAA

A System for use in Pulling a Conduit

Field of the invention The present invention relates to a pulling a conduit, and to a system for use in pulling such a conduit.

Background It is known to pull conduits for installation, removal and/or rehabilitation. By way of example, installation of high voltage power lines involves laying conduit (which is also known as a "conductor"or "cable") along the ground at the foot of the transmission towers, partially lifting the conductor up to the cross-arms of the towers, and then pulling the conductor along its length to raise the cable to the desired position.

In other examples, the conduit may be other electrical cable, optical fibre cable, pipe, wire rope, and the like.

In the case of a high voltage power line conductor, the weight of the conductor can be in the range of 15 to 40 kg / m. Installation of such conductors can induce tensile forces in the conductor of up to 150kN. Typical transmission lines for 132 kV AC circuits have transmission towers of the order of 15 to 50 metres in height, and at spans of the order of 300 to 600 metres.

As will be appreciated, pulling the conductor can require considerable force over an extended pulling length. It is known to hitch a towing strap between the conductor and a road vehicle, and raise the conductor by driving the vehicle away from the transmission tower. This technique becomes unviable where access between the transmission towers inhibits the vehicle movement, and in limited access situations it is known to use helicopters to lift and pull the cable. Employing a helicopter for pulling a conductor is expensive and requires favourable wind conditions.

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There is a need to address the above, and/or at least provide a useful alternative.

Summary There is provided a system for use in pulling a conduit, the system comprising: an anchor sub-assembly that includes: an anchor frame, a plurality of tines that depend from the anchor frame and are arranged such that the lower ends of the tines can engage the ground, and a set of mounts for mounting the anchor sub-assembly on a first end of a vehicle; and a winching sub-assembly that includes: a winching frame that is mountable on a second end of the vehicle, a winching line, a drum on which to wind the winching line, the drum being mounted on the frame so to be rotatable, and a motor that mounted on the winching frame and is connected with the drum, wherein, in use of the system to pull the conduit, the tines of the anchor sub assembly are placed against or embedded in the ground beneath the anchor frame, the winching line is unwound and coupled to the conduit, and the winching sub-assembly is then operated to drive the motor and wind the winching line onto the drum, with the anchor sub-assembly resisting movement of the vehicle in the direction opposite to the pulling the direction of the conduit by the tines biting into the ground.

In at least some embodiments, the anchor sub-assembly further includes one or more weights, and the anchor frame includes at least one cradle to receive and locate the weights. Preferably, the weights are removably received within the respective cradle.

The anchor frame can have a plurality of cradles that each receive a respective one of the weights.

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The anchor sub-assembly can further comprise a restraint for inhibiting the weights from separating from the anchor frame. In one form, the restraint includes a tether that is connected or is connectable to the anchor frame, and to each of the weights.

Each tine can include a leg that is connected to the anchor frame, and a foot at the lower end the leg, wherein the foot is shaped to dig into the ground with movement of the system in the direction from the anchor sub-assembly towards the winching sub-assembly. Alternatively or additionally, each tine has a tapered point that is distal to the anchor frame. Preferably, the top surface of each foot is angled away from the anchor frame.

In certain embodiments, the set of mounts can be configured to facilitate the connection of the anchor sub-assembly to a three-point linkage of the vehicle.

The anchor sub-assembly can further comprise a plurality of props, and the anchor frame can include holders that each receive one of the props, whereby the props are receivable in the holders in a supporting position in which the anchor frame is supportable on a ground surface by the props.

In at least some embodiments, the props are receivable in the holders in a stowed position in which the props are spaced from the lower ends of the tines.

Preferably, each prop includes a foot plate at a first end, wherein when the respective prop is received in its holder in the supporting position the foot plate is beneath the anchor frame so as to contact the ground surface.

The props can be configured such that when the props are received in the holders in the supporting positions and the anchor sub-assembly is supported on the ground surface by the props, the lower ends of the tines are above the ground surface.

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Each prop can include a fastener to prevent unintended removal of the respective prop from its holder. In certain embodiments, each prop includes a post portion that has a mounting region at the opposite end of the post portion to the foot plate, and the fastener is a linchpin that is to extend through transverse holes that are formed in the mounting region of the prop.

In certain embodiments, each holder is a tubular member through which the post portion of the prop is received when the respective prop is in either the supporting or stowed positions. Preferably, the mounting region of each prop includes a stop member, the stop member limits movement of the post portion through the holder.

Preferably, the winching sub-assembly includes a fairlead that is mounted on the winch frame adjacent the drum, wherein in use of the system the winching line comes off the drum and passes through the fairlead. More preferably, the fairlead is a roller fairlead.

The system can further comprise an earth grounding conductor that is attachable to one of the vehicle and the system, and to an earth grounded member. In some embodiments, the earth grounded member is part of the system. The earth grounded member can be a spike that is to be embedded in the ground.

In at least some embodiments, the system further comprises a first guard that is mountable on the vehicle between the vehicle operator cabin and the winching sub assembly, the first guard being configured to allow visibility through the first guard and to provide a barrier to flying objects entering the vehicle operator cabin.

Alternatively or additionally, the system further comprises a second guard that is mountable between the vehicle radiator and the drum of the winching sub-assembly, wherein the second guard is configured to provide a barrier to flying objects striking the vehicle radiator. Preferably, the second guard is configured to allow light to pass therethrough.

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In some embodiments, the second guard is mounted on the winching frame.

In at least some preferred embodiments, the anchor sub-assembly is mountable to the rear of the vehicle, and the winching sub-assembly is mountable to the front of the vehicle.

The system can further comprise a towing adapter that has a frame that supports a second set of mounts on the frame for mounting the towing adapter on the rear end of the vehicle, and a hitch coupling to which a complementary hitch coupling on a trailable vehicle is couplable.

Preferably, the second set of mounts is configured to connect to the three-point linkage of the vehicle.

Brief description of the drawings In order that the invention may be more easily understood, embodiments will now be described, by way of example only, with reference to the accompanying drawings, in which: Figure 1: is a schematic view of a vehicle with a system for use in pulling a conduit according to a first embodiment of the present invention; Figure 2: is a front view of the vehicle and system of Figure 1; Figure 3: is a rear view of the vehicle and system of Figure 1; Figure 4: is a rear perspective view of the anchor sub-assembly of the system shown in Figure 1; Figure 5: is a front view of the anchor of Figure 4; Figure 6: is a plan view of the anchor of Figure 4; Figure 7: is a rear view of the anchor of Figure 4; Figure 8: is a right rear perspective view of the anchor sub-assembly of Figure 4, showing the weights spaced from the support frame;

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Figure 9: is a right rear perspective view of the anchor sub-assembly of Figure 4, showing the support legs in a deployed position; Figure 10: is a rear perspective view of one of the weights of the system of Figure 1; Figure 11: is an enlarged front view of Region A in Figure 2, showing the winching sub-assembly; Figure 12: is a right side view of the winching sub-assembly of Figure 11; Figure 13: is a left side view of the vehicle of Figure 2, with a towing adapter according to another embodiment of the invention mounted on the three-point linkage of the vehicle, with a trailer; and Figure 14: is a rear elevation view of the towing adapter of Figure 14.

Detailed description Figures 1 to 3 show a vehicle V, with a system for use in pulling a conduit, the system being in accordance with a first embodiment. In this illustrated example, the system is being used to pull an electrical conductor C during installation of that conductor C to a transmission tower T.

The system includes an anchor sub-assembly 10 mounted on the rear of the vehicle V, and a winching sub-assembly 12 mounted on the front of the vehicle V.

The anchor sub-assembly 10, which is shown in further detail in Figures 4 to 9, includes an anchor frame 14, and tines 16 that are arranged with respect to the anchor frame 14 so that the lower ends of the tines 16 can engage the ground (as shown in Figure 3). In this particular embodiment, the tines 16 are connected to the anchor frame 14 so as to depend (in other words, to project downwardly) from the anchor frame 14. The anchor sub-assembly 10 of this example has four tines 16. As shown in Figures 6 and 7, the anchor sub-assembly 10 includes mounts 18 on the anchor frame 10 to facilitate mounting of the anchor sub-assembly 10 on the vehicle V.

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The winching sub-assembly 12, which is shown in further detail in Figures 11 and 12, includes a winching frame 20 that is mounted on the front end of the vehicle V, and a winch 22 that is supported on the winching frame. The winch 22 includes a winching line 24, a drum 24 on which to wind the winching line, and a motor 26 that is operable to cause the drum 24 to rotate, thereby winding / unwinding the winching line 24 onto / off the drum 24.

In use of the system to pull the conductor C, the operator positions the vehicle V so that the fore-aft direction is generally parallel to the pulling direction, and the winching sub-assembly 12 is the closest part of the two sub-assemblies 10, 12 to the conductor C. The operator manipulates the anchor sub-assembly 10 such that the tines 16 are either resting against, or embedded in, the ground G beneath the anchor frame 14. The winching line 24 is unwound and coupled to the conductor C. The winching sub-assembly 12 is then operated to drive the motor 28, which causes drum 26 to rotate, thus winding the winching line 24 onto the drum 26. As the winching line 24 retracts towards the vehicle V, the system pulls the conductor C. In Figure 1, the pulling direction of the system on the conductor C is indicated by arrow P.

With the tines 16 embedded in the ground G, the anchor sub-assembly 10 resists movement of the vehicle V that is in the direction opposite to the pulling direction P of the conductor C by the tines 16 biting into the ground G.

As will be appreciated from Figure 1, the tensile load in the winching line 24 that is generated during installation of the conductor C has a horizontal component (which is opposite to the general pulling direction P), and a vertical component that is opposite to gravity. The vertical component of the tensile load has the effect reducing the weight of the vehicle V that is on the front wheels of the vehicle V and, to a lesser extent, on the rear wheels of the vehicle V. Consequently, the weight of the vehicle V is transferred to the tines 16, via the anchor frame 14. This has the beneficial effect of increasing the down force on the tines 16, which urges the tines 16 into the ground G.

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As shown in Figures 3 to 9, the anchor sub-assembly 10 further includes weights 30, and the anchor frame 14 includes cradles 32 to receive and locate the weights 30. In this particular embodiment, the anchor frame 14 has three cradles 32 that each receive one of the weights 30. As shown in Figure 8, the weights 30 are removably received within the respective cradle 32. In this way, the weights 30 can be removed from the anchor frame 14, if desired. Further, weights of differing mass can be installed on the anchor frame 14; for example, where the ground is soft, and higher down force is beneficial for deeper embedment of the tines 16 into the ground.

The anchor sub-assembly 10 includes a restraint, which in this embodiment is in the form of a chain 34, that (when installed) inhibits the weights 30 from separating from the anchor frame 14. To this end, the anchor frame 14 has brackets 36 on opposing sides. As shown in Figure 10, each weight 30 includes a lifting and restraint point 38, which in this example consists of a pair of tongues 40 that project upwardly from the top surface of the weight 30 at a central position. The tongues have transverse holes 42, through which to pass a hitch pin 44.

To restrain the weights 30 to the anchor frame 14, the chain 34 is located between the tongues 40 of the lifting and restraint points 38, and a hitch pin 44 is passed through the transverse holes 42 so as to constrain the chain 34 within the lifting and restraint points 38. Further, the ends of the chain 34 are connected to the brackets 36, for example with shackles 46. In this way, the chain 34 forms a tether that is connected to the anchor frame 14, and to each of the weights 30.

As shown in Figure 10, each weight 30 can be provided with a reflector 47 on the rearward face. The reflectors 47 aid the visibility of the anchor sub-assembly 10, and thus also the vehicle V.

Each tine 16 include a leg portion 48 that is connected to the anchor frame 14, and a foot 50 at the lower end the leg portion 48. The foot 48 is shaped to dig into the ground with movement of the system in the pulling direction P (in other words, from the anchor

P10145.AU - 12/07/2019 sub-assembly 10 towards the winching sub-assembly 12). As shown in Figures 4, 8 and 9, the foot 50 of each tine 16 has a tapered point that is distal to the anchor frame 14. The taper is configured such that the top surface of the foot 50 is angled away from the anchor frame 14. This inclination of the top surface of the foot 50 urges the tine 16 into deeper embedment within the ground G, in the event that the vehicle V is moved in the direction opposite to the pulling direction P as the conductor C is pulled.

The anchor sub-assembly 10 has props 52, and holders 54 that are secured to the anchor frame 14. In this particular example, the anchor sub-assembly 10 has four props 52. The props 52 are removably connectable to the holders 54 in a supporting position (shown in Figure 9), such that the anchor frame 14 is supportable the props 52 and above the ground surface. In this way, the anchor sub-assembly 10 can be detached from the vehicle V, and "parked" in an upright position. Further, the props 52 are connectable to the holders 54 in a stowed position (as shown in Figures 3 to 8) in which the props 52 are spaced from the lower ends of the tines 16. When in the stowed positions, the props 52 do not interfere with the tines 16 contacting and/or embedding into the ground beneath the anchor frame 14.

Figure 7 shows props 52 removed from the holders 54. As shown in Figure 7, each prop 52 includes a foot plate 56, and a post portion 58. The foot plate 56 is at a first end of the post portion 58, and at the opposing end is a mounting region of the respective prop 52. When the props 52 are installed in the holders 54 in the supporting position, the foot plates 56 are beneath the anchor frame 14 so as to contact the ground surface.

Within the mounting region of each prop 52 there is a fastener to prevent unintended removal of the respective prop 52 from its holder 54. The post portion 58 of each prop 52 has a mounting region at the opposite end to the foot plate 54. In this particular embodiment, the fastener is in the form of a linchpin 60 that locates in transverse holes formed in the mounting region of the prop 52. Each prop 52 includes a stop member 62 within the respective mounting region, the stop member 62 being spaced from the linchpin 60.

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The holders 54 include a through hole through which the post portion 58 of the prop 52 is received when in either the supporting or stowed positions. In this particular embodiment, each holder 54 is a hollow tubular member that is secured to the anchor frame 14. The stop member 62 abuts the holder 54 to limit the movement of the post portion 58 through the holder 54. In each prop 52, the spacing of the stop member 62 from the transverse holes for the linchpin 60 is sufficient to enable the post portion 58 to be received in the holder 54 with the linchpin 60 and stop member 62 on opposing sides of the holder 54.

As shown particular in Figure 11, the winching sub-assembly 12 includes a fairlead 64 that is mounted on the winch frame 20 adjacent the drum 26. In use of the system, the winching line 24 comes off the drum 26, and passes through the fairlead 64. In this preferred embodiment, the fairlead 64 is a roller fairlead, which reduces resistance on the winching line 24 while pulling the conductor C.

The winching sub-assembly 12 also includes a radiator guard 66 that is mounted to the winching frame 20, between the vehicle's radiator and the drum 26. The radiator guard 66 provides a barrier to flying objects striking the vehicle radiator. For example, in the event that the winching line 24 breaks under load the radiator guard 66 absorbs kinetic energy of the broken winching line 24, so as to prevent, or at least reduce, damage to the vehicle. In this embodiment, the radiator guard 66 is made of mesh so as to allow light from the vehicle's headlights to pass through the radiator guard 66.

As shown in Figures 1 and 2, the system also includes a cabin guard 68 that is mounted to the winching frame 20, between the vehicle's operator cabin and the winching sub-assembly 12. The cabin guard 68 provides a barrier to flying objects striking the cabin front screen. For example, in the event that the winching line 24 breaks under load the cabin guard 68 absorbs kinetic energy of the broken winching line 24, so as to prevent, or at least reduce, damage to the vehicle. In this embodiment, the cabin guard 68 is made of mesh so as to allow the vehicle operator to see through the cabin guard 68.

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The system further includes an earth grounding conductor 70 that is attachable to one of vehicle V and another component part of the system, and to an earth grounded member, which can be a spike (not shown) that is to be embedded in the ground. In this example, the earth grounding conductor 70 is attached to the chassis of the vehicle V. The earth grounding conductor 70 and spike electrically ground the vehicle V and system, so as to minimise the likelihood of electrocution.

The system of this embodiment further comprises a towing adapter 80, which is shown in Figures 13 and 14. Figure 13 shows the vehicle V, with the towing adapter 80, and a trailer S. The towing adapter 80 has a frame 82 that supports a set of mounts 84, and a hitch coupling 86. In this embodiment, the frame 82 has a generally inverted "T" shape. The mounts 84 are provided on a first side of the frame 82, and are configured to mount the towing adapter 80 on the rear end of the vehicle V, as generally indicated in Figure 13. In this example, the vehicle V has a three-point linkage, and the towing adapter 80 has three mounts 84 that are generally arranged to couple to that three-point linkage. In the view illustrated in Figure 14, the towing adapter 80 is oriented with the mounts 84 obscured by the frame 82.

The hitch coupling 86 is arranged on the second side of the frame 82, as illustrated in Figure 14. The hitch coupling 86 couples with a complementary hitch coupling on the drawbar of the trailer S, as indicated in Figure 13.

In the illustrated example, the vehicle V is a tractor. However, it will be appreciated that some alternative embodiments of the system may be mounted on other types of vehicles. Similarly, in some alternative embodiments, the anchor sub-assembly may be mounted to the front of the host vehicle, with the winching sub-assembly mounted to the rear of the host vehicle.

Vehicles with a three-point linkage have the benefit of an integral actuator system that can readily raise and lower the anchor sub-assembly, with respect to the chassis of

P10145.AU - 12/07/2019 the vehicle. Thus, the feet of the tines can be static with respect to the anchor frame. In some alternative embodiments, it may be desirable for the anchor sub-assembly to include actuators such that the anchor frame can be static with respect to the chassis of the vehicle, and for the tines to include actuators to raise and lower the feet with respect to the anchor frame.

Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" and "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.

The reference in this specification to any prior publication (or information derived from it), or to any matter which is known, is not, and should not be taken as an acknowledgment or admission or any form of suggestion that that prior publication (or information derived from it) or known matter forms part of the common general knowledge in the field of endeavour to which this specification relates.

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Claims (27)

CLAIMS:

1. A system for use in pulling a conduit, the system comprising: an anchor sub-assembly that includes: an anchor frame, a plurality of tines that depend from the anchor frame and are arranged such that the lower ends of the tines can engage the ground, and a set of mounts for mounting the anchor sub-assembly on a first end of a vehicle; and a winching sub-assembly that includes: a winching frame that is mountable on a second end of the vehicle, a winching line, a drum on which to wind the winching line, the drum being mounted on the frame so to be rotatable, and a motor that mounted on the winching frame and is connected with the drum, wherein, in use of the system to pull the conduit, the tines of the anchor sub assembly are placed against or embedded in the ground beneath the anchor frame, the winching line is unwound and coupled to the conduit, and the winching sub-assembly is then operated to drive the motor and wind the winching line onto the drum, with the anchor sub-assembly resisting movement of the vehicle in the direction opposite to the pulling the direction of the conduit by the tines biting into the ground.

2. A system according to claim 1, wherein the anchor sub-assembly further includes one or more weights, and the anchor frame includes at least one cradle to receive and locate the weights.

3. A system according to claim 2, wherein the weights are removably received within the respective cradle.

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4. A system according to either claim 2 or 3, wherein the anchor frame has a plurality of cradles that each receive a respective one of the weights.

5. A system according to any one of claims 1 to 4, wherein the anchor sub-assembly further comprises a restraint for inhibiting the weights from separating from the anchor frame.

6. A system according to claim 5, wherein the restraint includes a tether that is connected or is connectable to the anchor frame, and to each of the weights.

7. A system according to any one of claims 1 to 6, wherein each tine includes a leg that is connected to the anchor frame, and a foot at the lower end the leg, and wherein the foot is shaped to dig into the ground with movement of the system in the direction from the anchor sub-assembly towards the winching sub-assembly.

8. A system according to claim 7, wherein the top surface of each foot is angled away from the anchor frame.

9. A system according to any one of claims 1 to 8, wherein each tine has a tapered point that is distal to the anchor frame.

10. A system according to any one of claims 1 to 9, wherein the set of mounts are configured to facilitate the connection of the anchor sub-assembly to a three-point linkage of the vehicle.

11. A system according to any one of claims 1 to 10, wherein the anchor sub-assembly further comprises a plurality of props, and the anchor frame includes holders that each receive one of the props, whereby the props are receivable in the holders in a supporting position in which the anchor frame is supportable on a ground surface by the props.

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12. A system according to claim 11, wherein the props are receivable in the holders in a stowed position in which the props are spaced from the lower ends of the tines.

13. A system according to either claim11 or 12, wherein each prop includes a foot plate at a first end, wherein when the respective prop is received in its holder in the supporting position the foot plate is beneath the anchor frame so as to contact the ground surface.

14. A system according to any one of claims 11 to 13, wherein the props are configured to be received in the holders in the supporting positions such that the anchor sub-assembly is supported on the ground surface by the props, and the lower ends of the tines are above the ground surface.

15. A system according to any one of claims 11 to 14, wherein each prop includes a fastener to prevent unintended removal of the respective prop from its holder.

16. A system according to claim 15, wherein each prop includes a post portion that has a mounting region at the opposite end of the post portion to the foot plate, and the fastener is a linchpin that is to extend through transverse holes that are formed in the mounting region of the prop.

17. A system according to claim 16, wherein each holder is a tubular member through which the post portion of the prop is received when the respective prop is in either the supporting or stowed positions.

18. A system according to either claim 16 or 17, wherein the mounting region of each prop includes a stop member, and the stop member limits movement of the post portion through the holder.

19. A system according to any one of claims 1 to 18, wherein the winching sub-assembly includes a fairlead that is mounted on the winch frame adjacent the drum, and wherein in use of the system the winching line comes off the drum and passes through the fairlead.

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20. A system according to any one of claims 1 to 19, further comprising an earth grounding conductor that is attachable to one of the vehicle and the system, and to an earth grounded member.

21. A system according to any one of claims 1 to 20, further comprising a first guard that is mountable on the vehicle between the vehicle operator cabin and the winching sub assembly, wherein the first guard is configured to allow visibility through the first guard and to provide a barrier to flying objects entering the vehicle operator cabin.

22. A system according to any one of claims 1 to 21, further comprising a second guard that is mountable between the vehicle radiator and the drum of the winching sub-assembly, wherein the second guard is configured to provide a barrier to flying objects striking the vehicle radiator.

23. A system according to claim 22, wherein the second guard is configured to allow light to pass therethrough.

24. A system according to either claim 22 or 23, wherein the second guard is mounted on the winching frame.

25. A system according to any one of claims 1 to 24, wherein the anchor sub-assembly is mountable to the rear of the vehicle, and the winching sub-assembly is mountable to the front of the vehicle.

26. A system according to any one of claims 1 to 25, further comprising a towing adapter that has a frame that supports: a second set of mounts on the frame for mounting the towing adapter on the rear end of the vehicle, and a hitch coupling to which a complementary hitch coupling on a trailable vehicle is couplable.

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27. A system according to claim 26, wherein the second set of mounts is configured to connect to the three-point linkage of the vehicle.

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