EP2397808B1 - Device for neutralising an explosive charge and the like controled by wire - Google Patents

Description

The present invention relates to equipment for neutralizing explosive or similar devices buried in the ground and remotely controlled by a wired link such as electrical, and a vehicle for securing routes (roads, tracks, etc.). ) and on which is mounted said neutralization equipment.

The proliferation of IED equipment for improvised explosive devices, especially in conflict areas, is known to pose an increasingly dangerous and growing threat to people (military or civilian) and vehicles traveling on roads and highways. tracks where they are hidden. In fact, these improvised explosive devices are made relatively simply and artisanally, from components and / or mechanisms readily available commercially and diverted from their initial use, to design including their means of arming and firing, which tripping can be effected, depending on the type of gear, pressure, heat, or remote wired link in particular or radiocontrol.

The object of the invention is to treat the remotely controlled explosive devices by a wired connection of the electric type, connecting the explosive charge buried in the ground in the track and a controllable detonator remote from the load.

To date, no equipment is able to deal effectively with this threat except for military patrols prudently using the track to secure it, which is a long and particularly exposed operation.

Indeed, the existing equipment is poorly suited to this type of wired gear.

• Les équipements de détection d'électronique à distance sont inopérants sur cette menace qui peut très bien fonctionner sans aucune électronique, un seul détonateur électrique suffit.
• La détection visuelle est également inopérante car la charge est enfouie sous la route, par exemple, dans un nid de poule. Le fil de mise à feu est totalement dissimulé et invisible pour un équipage de véhicule circulant sur la route.
• Les équipements à détection de fil ne sont pas non plus utiles car ceux qui existent sont dérivés des détecteurs de métaux à main, qui demandent une vitesse lente et une hauteur de balayage par rapport

au sol très faible (quelques centimètres).For example,

• Remote electronics detection equipment is ineffective on this threat that can work very well without any electronics, only one electric detonator is enough.
• Visual detection is also ineffective because the load is buried under the road, for example, in a pothole. The firing wire is completely concealed and invisible to a vehicle crew traveling on the road.
• Wire detection equipment is also not useful because the existing ones are derived from hand-held metal detectors, which require a slow speed and a relative sweeping height.

very low ground (a few centimeters).

These means are therefore unsuitable for a mission that consists of securing a road or a runway without exposing dismounted military personnel.

Admittedly, armored vehicles carrying heavy demining equipment can be envisaged, but these require considerable logistics and are not suitable for difficult tracks either. For example, the document US 5189243 teaches such heavy demining equipment carried by a tank and treating the usual mines buried in the ground.

It is also known from the document WO 2007/058868 , a multifunctional tool articulated at the end of a controllable arm linked to robotic equipment. This is controlled remotely and is brought, after detection, close to an explosive device. The tool is operated to dig the soil by blades from articulated gripping fingers and releases the machine and, after various manipulations, the wire or cable of the machine is placed in the cutting jaws provided in the blades for y to be severed.

It is therefore realized that the work of such a robot, if it is effective, is particularly long (important intervention time) and meticulous to succeed in clearing and then remotely placing the cables in the knife jaws, and can only be operational on detected point targets. In this way, it can not be used to secure routes on long distances given the time needed to neutralize each explosive device.

The present invention aims to overcome these disadvantages, and relates to a neutralization equipment whose design allows to effectively deal with explosive devices wire bond securely and quickly, without exposing personnel.

• ledit outil se présente sous la forme d'au moins une griffe d'extrémité apte à pénétrer dans le sol pour accrocher ladite liaison filaire et rompre celle-ci par le déplacement dudit outil, et, par rapport à la direction d'avance apte à être imposée par le véhicule, ledit outil à griffe est déporté latéralement pour que cette dernière soit amenée dans l'une des zones latérales au véhicule, en se trouvant dans un plan sensiblement perpendiculaire au sol,
• il comprend un support allongé au bout duquel est monté ledit outil à griffe pour le déporter latéralement sur ladite zone latérale choisie, et qui se présente sous la forme d'un bras qui est apte, d'un côté, à être relié transversalement au véhicule et auquel est associé, de l'autre côté, ledit outil à griffe, et
• ledit outil comporte un porte-griffe dont la liaison avec le bras et/ou la griffe est du type amovible.

For this purpose, the equipment for neutralizing explosive or similar devices buried in the ground and remotely controlled by a wired link, equipment of the type intended to be associated with a vehicle and comprising a tool for disengaging and cutting the wire link, is remarkable, according to the invention, in that:

• said tool is in the form of at least one end claw adapted to penetrate the ground to hook said wire link and break it by the movement of said tool, and, with respect to the direction of advance suitable for be imposed by the vehicle, said claw tool is offset laterally so that the latter is brought into one of the lateral areas of the vehicle, being in a plane substantially perpendicular to the ground,
• it comprises an elongate support at the end of which is mounted said claw tool for laterally displacing it on said selected lateral zone, and which is in the form of an arm which is able, on one side, to be connected transversely to the vehicle and to which is associated, on the other side, said claw tool, and
• said tool comprises a claw holder whose connection with the arm and / or the claw is of the removable type.

Thus, thanks to the invention, the claw produces in the ground a continuous groove in the manner of a plow agricultural equipment, to identify the wire links running transversely to the trail of explosive devices, and to cut these wire links by following the advance of the vehicle when the equipment is associated with the latter, by neutralizing said gear before the passage of the vehicle. The latter buried in the ground of the track are then identified by the broken wire link and withdrawn.

Such neutralization equipment is therefore lightweight design and can quickly secure a route (track, road, ...) vis-à-vis this type of explosive devices wired link. The claw is further simply changed after wear.

Furthermore, the equipment comprises means for driving the claw into the ground so that it acts on a sufficient depth.

In a first example, said driving means are defined by the same elasticity of said tool and / or said elongated support, able to spontaneously force the claw into the ground by reaction.

Advantageously, said elongate support and said claw holder are made of a single elastically deformable blade.

In a second example, said driving means are defined by the intrinsic mass of said equipment. In particular when the latter is mounted on a rolling stock equipped with other equipment detection equipment mass type, thermal, etc ...

In a third example, said driving means are defined by an elastic actuator mounted between the elongate support and the claw tool, said support and tool being connected to each other by a hinge pin around which can rotate the claw tool.

Preferably, said actuating member is a spring-shock absorber or the like.

In addition, the equipment may comprise means for raising the claw tool relative to the ground. For example, said lifting means comprise a control cylinder or the like respectively mounted between the elongate support and the claw tool, said supports and tool being connected to each other about an axis of articulation.

The equipment may also include fuse means capable of separating the claw tool from the rest of the equipment, which avoids damaging the vehicle in the event that the tool is blocked by an obstacle. They can be, for example, defined by an interface with calibrated fusible screws, arranged on the support extended at one of the links thereof to the claw tool or the vehicle.

The equipment may also include means for limiting the depth of insertion of the claw into the ground.

In a particular embodiment, said limiting means comprise at least one wheel to which said claw tool is connected and whose contact with the ground serves as a stop limiting the depression of the claw in the ground.

In a variant, said limiting means comprise at least one flat element in the form of a ski which is connected to said claw tool and whose contact with the ground acts as an abutment limiting the depression of the claw in the ground.

Furthermore, to optimize the detection and the neutralization of wired connection explosive devices, said tool may comprise at least two claws arranged in series one behind the other or at least two claws arranged in parallel.

The invention also relates to the vehicle for securing routes such as roads, tracks or the like, which may include explosive devices or the like buried in the ground and remotely controlled by a wire link. Advantageously, it comprises at least one neutralization equipment as defined above.

The vehicle may be of the driver-driven type or of the remote-controlled type.

• Les figures du dessin annexé feront bien comprendre comment l'invention peut être réalisée. Sur ces figures, des références identiques désignant des éléments semblables.
• La figure 1 est une vue en perspective schématique de l'équipement de neutralisation d'engins explosifs filaires, selon un exemple de réalisation, porté par un véhicule.
• La figure 2 montre, en perspective partielle, une réalisation de l'équipement de neutralisation avec des moyens de séparation de l'outil à griffe de celui-ci.
• La figure 3 montre, en perspective partielle, une réalisation de l'équipement de neutralisation avec des moyens de relevage de l'outil à griffe .
• La figure 4 montre, en perspective partielle, une réalisation de l'équipement de neutralisation avec un exemple de moyens d'enfoncement de la griffe dans le sol.
• La figure 5 montre, en perspective partielle, une réalisation de l'équipement de neutralisation avec la griffe dudit outil démontable.
• La figure 6 est une vue de côté de l'équipement monté sur une structure rigide d'un matériel roulant.
• La figure 7 montre, en perspective partielle, une réalisation de l'équipement de neutralisation, dans laquelle le support de déport et l'outil à griffe sont monobloc.

Preferably, said equipment is carried by the structure of said vehicle or rolling stock coupled to the front of said vehicle and advantageously carrying means for activating explosive devices whose triggering is controlled differently.

• The figures of the appended drawing will make it clear how the invention can be realized. In these figures, identical references designating similar elements.
• The figure 1 is a schematic perspective view of the equipment for neutralization of wired explosive devices, according to an exemplary embodiment, carried by a vehicle.
• The figure 2 shows, in partial perspective, an embodiment of the neutralization equipment with means for separating the claw tool thereof.
• The figure 3 shows, in partial perspective, an embodiment of the neutralization equipment with lifting means of the claw tool.
• The figure 4 shows, in partial perspective, an embodiment of the neutralization equipment with an example of means for driving the claw into the ground.
• The figure 5 shows, in partial perspective, an embodiment of the neutralization equipment with the claw of said removable tool.
• The figure 6 is a side view of equipment mounted on a rigid structure of rolling stock.
• The figure 7 shows, in partial perspective, an embodiment of the neutralization equipment, wherein the offset support and the claw tool are monobloc.

Explosive Ordnance Disposal Equipment E, shown on the figure 1 , is preferably associated with a motorized armored vehicle 2 intended, among other missions, securing pathways such as tracks, roads, etc ... in areas at risk. And the purpose of this equipment 1 is to neutralize more particularly explosive devices E whose activation is controlled by a wired link LF. It has thus been represented by a dotted line on the figure 1 , one of these gear E buried in the track P taken by the vehicle 2 and which is derived from the wire connection LF of the electric cable type. This link LF is also hidden in the ground and is generally arranged transversely to the P track to end, remotely, to a controllable detonator.

In this example, the vehicle 2 carrying the neutralization equipment 1 is piloted by a crew including a driver, but it could be without pilot and remotely controlled in the manner of a robot. Furthermore, although logically placed at the front of the vehicle 2, the neutralization equipment 1 could be located laterally to the latter, or even to the rear.

The neutralization equipment 1 illustrated schematically comprises a tool 3 for acting on the wire connection LF of the machine E to section and, according to the invention, the tool 3 is in the form of a claw 4 which the free end 5 enters the ground to hook the wire link LF and break as a result of the advance of the vehicle 2 on the P track.

With respect to the movement of the vehicle, according to the direction A, the claw 4 follows parallel thereto and is disposed in a plane perpendicular to the ground, that is to say vertical, by producing a groove SL. And it is deported in front of and laterally with respect to the vehicle traveling on the track P in which the explosive devices E can be buried, to be brought into one of the lateral zones Z to the vehicle. Such a zone Z, as shown by figure 1 , is between the corresponding lateral side CL of the vehicle and a relief, not shown, such as an embankment, ditch, etc ..., naturally limiting the track and therefore the extension of the tool, so that the claw is often on the roadside, the edge or the shoulder of the path.

To allow the lateral offset of the claw tool 3 relative to the vehicle, the equipment 1 comprises, in the embodiment illustrated in FIG. figure 1 , an elongated support 6 which is, on one side, articulated about axes 7 to the two usual towing or coupling rings 8 integral with the armored front plate 9 of the vehicle 2, and carries, on the other side, the work tool 3. More particularly, the elongated support 6 consists of a beam arm 10, which is arranged transversely to the vehicle 2 and away from the front face 9 of the latter by two parallel connecting elements 11 forming spacer and perpendicularly connecting the arm 10 to the two rings 8 of the front of the vehicle. These connecting elements 11, combined with the length of the arm 10, allow to distance, at a sufficient distance, the claw 4 of the vehicle to act on the lateral zone Z of the P-track.

The tool 3 furthermore comprises a gripper holder 12 for connection to the offset arm 10. This gripper holder can be integral with the claw 4 ( Figures 1 to 3 ) or form a support handle for mounting the claw ( Figures 4 to 6 ), by its end opposite to that tapered penetrating the ground. The shape of the claw can be folded ( figures 1 and 4 ), curved ( figures 2 , 3 , 5 and 6 ) or other and its profile, rotated in the direction of advance of the vehicle to the wired links to be cut, can of course be relatively sharp to facilitate their break. The depth of insertion of the claw into the ground S, optimized by its shape and its profile, is of the order of a few centimeters and makes it possible to hang the concealed wire connection LF and to break it by the "shock" drive due to vehicle advance 2.

Also, to ensure optimal and safe operation, the neutralization equipment 1 comprises several specific means which are described below.

For example, to ensure protection between the vehicle structure and the tool in case the claw is blocked by an obstacle (relief too rigid or abrupt so that it can escape spontaneously), fuse separation means 15 are provided on the equipment 1.

In the representation illustrated on the figure 2 these fusible means 14 are obtained by a dedicated interface 15 with calibrated fuse screws 16, arranged at the level of the offset transverse arm 10, near the claw tool 3. This interface 15 consists of two integral plates 17, 18 respectively of the arm 10 and its end 19 in this example and associating them by the fusible screws 16. The end 19 could be the tool holder itself. Thus, when the claw 4 is immobilized or jammed, the forces generated on the equipment as a result of the advance of the vehicle 2 while the claw is blocked, pass through the interface 15, which breaks at the level of the screws 16 which yield, to separate the tool 3 with the end 19 of the offset cross arm 10. This avoids, therefore, to damage the equipment 1 and possibly the front structure of the vehicle.

The broken fusible screws 16 are then simply replaced by new screws to reassemble the arm 10 and the tool 3 of the neutralization equipment 1.

One could also consider providing these fusible means 14 at the connecting elements 11 of the support 6, articulated to the attachment rings 8 of the vehicle.

Lifting means 20 of the claw tool are also provided on the equipment 1 so as to bring the tool 3 from an active down position to an inactive high position when not in use, waiting by example, or even to cross a major obstacle (rock) located on Zone Z.

In an embodiment illustrated on the figure 3 , the lifting means 20 are defined by a jack or the like 21 of the fluidic or electric type, mounted between the elongate support 6 and the claw tool 3 4, which support 6 and tool 3 are then hinged together around a horizontal axis 22, parallel to the vehicle. For example, the offset arm 10 of the support 6 terminates in a yoke 23 in which an elongate end 25, which may be that of the arm 10 or the gripper holder 12, is articulated around the axis 22. Fuses 14 between these are further illustrated. And the cylinder 26 of the jack 21 is connected, by a horizontal hinge pin 27, to a clevis 28 of the arm, while its rod 29 is mounted around an axis of articulation also horizontal 30 parallel to the other 22 and 27 at a clevis 31 provided on the end 25.

It is thus understood that the retraction (or the exit) of the rod 29 during the actuation of the jack 21, in its cylinder 26 causes the pivoting tool 3 claw 4 integral with the end 25 around the hinge axis 22 and, accordingly, the lift according to the arrow F of the tool 3.

Note also that the other side of the transverse arm offset 10 terminates in a hinge clevis 23 'similar to the previous one. This makes it possible to be able to mount the claw tool 3 with the corresponding end 25, on this side of the arm, simply by inverting it, to treat the other lateral zone of the track P. It could also be envisaged to mount tools 3 to claw on both sides of the offset arm 10 to treat the two lateral zones Z simultaneously, as schematically shown in FIG. figure 1 (a tool is represented in solid line, the second in dashed line).

Means 34 for driving the claw 4 of the tool 3 into the ground S are also provided on the equipment 1.

In a simple embodiment, the tool 3 and, more particularly, the gripper holder 12 is made of an elastically deformable material, so that, by the elasticity of the tool, the claw 4 has a spontaneous tendency to penetrate the soil by reaction, following the deformation of the claw holder when the tip 5 of the claw sinks into the ground. For example, on Figures 1 to 3 , the claw holder 12 in one piece with the claw, can be made from a steel or composite blade, or from a spring wire. Thus, not only the claw 4 sinks into the ground but, the tool 3 can escape elastically towards the rear, with respect to the advance of the vehicle, when the claw abuts an obstacle (stone, root, ...), which allows to clear the claw, which is repositioned in the ground once the obstacle crossed, again by the elasticity of the tool.

In another embodiment, the driving means 34 are defined by an elastic actuating member 36 which presses the claw 4 into the ground S. For this, as shown in FIG. figure 4 , the tool 3 is mounted at the end of the end 37 of the transverse offset arm 10 of the support 6 around a horizontal axis of articulation 38, extending in this direction the end 37. And the actuating member 36 is a combined spring-damper 39 connected by hinge pins 40, 41 parallel to the axis 38, respectively to a yoke 42 extending perpendicularly to the end 37 of the transverse arm 10 and a yoke 43 from the gripper holder 12. The action of this combined damping spring 39 imposes on the tool 3 and in particular on its claw 4 a rotational movement (arrow F1) around the axis 38 tending to make the tip 5 of the claw penetrate the ground.

Again, in the event of an obstacle, the claw 4 can be erased by the opposite rotation of the tool around the axis 38 and return spontaneously elastically under the action of the handset 39 to the ground by engaging in it sufficiently deeply.

Furthermore, the claw 4 of the tool 3, if it can be monobloc with the claw holder 12, as on the Figures 1 to 3 , can be dismountable especially to be changed as a result of its wear to make the furrow in a soil often hard. For this, it can be reported by appropriate fasteners 45 represented by their axes on the flat claw holder 12, as on the figure 4 , or engaged by its end 46 opposite the active end 5, in the claw holder 12 and held in place therein by fasteners 47, snap-fastening or the like etc .., as on the figure 5 . It is recalled, moreover, that the shape of the claw tool 3 can vary from one embodiment to another in the figures, the essential being that the claw 4, removable or not, penetrates sufficiently into the ground S for realize the SL furrow in the manner of a share and cut the wire connection LF buried gear E.

In the illustrated embodiment on the figure 1 , the neutralization equipment 1 is mounted directly on the structure or front plate 9 of the vehicle. However, this equipment 1 may be associated with a rolling stock 50 coupled to the front plate of the vehicle 2 and carrying, on its transverse beam structure 51, other neutralization equipment not shown explosive devices but triggered by pressure, heat or whatever. Such equipment coupled to an armored vehicle is, for example, described in the patent application. FR 08 06923 ; published without number FR 2939504 .

In this case, as shown in figure 6 particularly representing the front beam structure 51 of rolling stock 50 pushed by the vehicle, the mass of this rigid material ensures the depression of the claw 4 in the ground. Advantageously, the driving depth thereof can be adjusted by the position of the tool 3, or the claw holder on the support leg 52 connecting the wheel shown 53 to the beam structure 51 via a hinge 54. The gripper holder 12 is thus pre-adjusted with respect to the leg 52 so that the free tip end 5 of the claw 4 penetrates into the ground with the desired depth (a few centimeters), when the equipment 50 rolls on the track by its wheels 53. Thus, they play the role of abutment to avoid pushing the tool 4 too deeply into the ground S by the mass of the rolling stock 50, beyond the setting made.

In this mounting example of the equipment 1 associated with a hardware wheel, it can automatically align with the path of the vehicle. It is therefore interesting to make the tool 3 integral with the leg 52 of the wheel, so that the claw 4 follows the steering movements of the wheel and thus aligns automatically. In this way, the work of the claw is made without shifting of it in turns and curves encountered the track.

In place of the wheels, or in addition to them, provision may be made, to limit the depression of the claw, one or flat elements in the form of ski (not shown), related to the beam structure and "sliding On the floor of the track so as to define an adjustable stop for the depth of the claw.

In another embodiment shown that the figure 7 the lateral offset arm 10 and the working tool 3 (the tool holder in this case) of the equipment are combined into one single piece 60. This one-piece piece 60 is in the form of an arcuate blade 61 elastically deformable, made for example of steel. A tip 5 terminating the claw 4 is attached, by fasteners 62, to the free end 63 of the arcuate blade, the other end 64 is intended to be attached to the vehicle. The one-piece elastic piece 60 makes it possible, on the one hand, to support the claw 4 with point 5 in the ground S and, on the other hand, to disengage the blade 61 from the zone Z of the track, by its elasticity, when the pointed claw sunk in the ground meets a rigid obstacle (rock, stump, etc.)

In alternative embodiments not shown, the tool 3 could comprise two (or more) claws 4 arranged in series one behind the other, in the same plane. Thus, if the first claw misses the wire connection controlling the explosive device, the second claw can be advantageously more acute and narrow, and acting in the groove made by the first, ensures the breaking of the wire link.

Instead of being arranged in series, the two claws 4 of the tool 3 could be mounted in parallel so that, here too, the efficiency of the neutralization equipment 1 is optimized.

The latter equipped with its various means and follows the relief encountered from the side of the track to be controlled, so that the contact between the claw tool and the ground is ensured continuously to hang the wire rope cable explosive devices and severing them as a result of the advance of the vehicle by neutralizing them before the passage of the vehicle.

Claims (19)

1. Device for neutralising explosive charges or the like which are buried in the ground and controlled remotely via a wired connection, the device being adapted for connection to a vehicle and comprising a tool for releasing and cutting the wired connection,

   - said tool (3) has the form of at least one end claw (4) which is capable of penetrating the ground to catch said wired connection and break it by the displacement of said tool and, relative to the direction of forward motion, capable of being steered by the vehicle, said tool (3) with claw (4) is offset laterally so that the claw is brought into one of the lateral zones (Z) of the vehicle, in a plane substantially perpendicular to the ground, characterised in that it comprises an elongate support (6) at the end of which is mounted said tool (3) with claw (4) so the tool can be offset laterally on said selected lateral zone (Z), and which has the form of an arm (10) capable, on the one side, of being connected transversely to the vehicle and to which is connected, on the other side, said tool (3) with claw, and

   - said tool (3) comprises a claw holder (12) removably connected to the arm and/or the claw.
2. Device according to claim 1, characterised in that it comprises means (34) for driving the claw (4) into the ground.
3. Device according to claim 2, characterised in that said driving means (34) are defined by the very resilience of said tool (3) and/or of said elongate support (6), capable of spontaneously forcing the claw into the ground.
4. Device according to claim 3, characterised in that said elongate support (6) and said claw holder (12) are made as a single resiliently deformable blade.
5. Device according to claim 2, characterised in that said driving means (34) are defined by the dead weight of said device.
6. Device according to claim 2, characterised in that said driving means (34) are defined by a resilient actuation member (36) mounted between the elongate support and the tool with claw, said support and tool being interconnected by a hinge pin (38) about which the tool (3) with claw can pivot.
7. Device according to claim 6, characterised in that said actuation member (36) is a combined spring/damper or the like.
8. Device according to any of claims 1 to 7, characterised in that it comprises means (20) for lifting the tool (3) with claw relative to the ground.
9. Device according to claim 8, characterised in that said lifting means (20) comprise an actuating cylinder (21) or the like mounted respectively between the elongate support and the tool with claw, said support and tool being interconnected about a hinge pin (22).
10. Device according to any of claims 1 to 9, characterised in that it comprises fusible means (14) capable of separating the tool (3) with claw from the rest of the device.
11. Device according to claim 10, characterised in that said fusible means (14) are defined by an interface (15) with fusible metering screws (16), arranged on the elongate support (6) at the level of one of the connections thereof to the tool with claw or to the vehicle.
12. Device according to any of claims 1 to 11, characterised in that it comprises means for limiting the depth to which the claw is driven into the ground.
13. Device according to claim 12, characterised in that said limitation means comprise at least one wheel (53) to which said tool (3) with claw is connected and the contact of which with the ground serves as a stop limiting the driving of the claw (4) into the ground.
14. Device according to claim 12, characterised in that said limitation means comprise at least one planar element in the form of a ski which is connected to said tool with claw and the contact of which with the ground serves as a stop limiting the driving of the claw into the ground.
15. Device according to any of claims 1 to 14, characterised in that said tool (3) comprises at least two claws arranged in series one behind the other.
16. Device according to any of claims 1 to 14, characterised in that said tool (3) comprises at least two claws arranged in parallel.
17. Vehicle (2) adapted for securing routes such as roads, paths or the like, likely to comprise explosive charges or the like which are buried in the ground and controlled remotely via a wired connection, characterised in that it comprises at least one neutralisation device (1) as defined in any of the preceding claims.
18. Vehicle according to the preceding claim, characterised in that it is controlled by a driver or controlled remotely.
19. Vehicle according to either claim 17 or claim 18, characterised in that said device (1) is carried by the structure of said vehicle (2) or by rolling stock (50) coupled to the front of said vehicle and carrying explosive charge activation means, the triggering of which is controlled differently.

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