Vehicle arrangement comprising a tank and a column extending behind the tank for securing a support.

Abstract

Vehicle arrangement comprising a tank and a column extending behind the tank for securing a support.The invention relates to an arrangement (2) for a vehicle comprising a tank (3) intended to store an energy fluid, the tank (3) comprising a rear face (3R) extending along a vertical and transverse or substantially vertical and transverse plane, a first element (11) of the cross member type and being arranged behind the tank (3), a second element (20) of the central column type, the central column (20) being substantially centered relative to a median plane (M) of such a vehicle and comprising a main fixing means (21) intended for fixing a towing hook, a third element (4L) of the first lateral column type, the first lateral column (4L) extending to the left of the median plane (M) of such a vehicle (1), the first lateral column (4L) comprising a secondary fixing means (42) intended for fixing a towing ring (70). Figure for abstract: figure 3.

Description

Title of the invention: Arrangement for a vehicle comprising a tank and a column extending behind the tank for fixing a support. Technical field of the invention

[0001] The invention relates to an arrangement for a vehicle comprising a tank and a longitudinally extending central column for attaching a support, in particular a support for transporting bicycles. The invention also relates to a vehicle comprising such an arrangement. The invention also relates to a method of assembling such a vehicle. State of the prior art

[0002] A vehicle, in particular a motor vehicle, can generally be equipped with a bicycle rack type support.

[0003] In the case of a so-called five-door vehicle, i.e. one comprising a tailgate, such a type of support is generally fixed to such a tailgate, in particular via hooks and / or straps. It is then difficult to carry more than one bicycle. In addition, access to a trunk closed by such a tailgate then becomes difficult or even impossible. In addition, fixing the support to a tailgate is complex and tedious. Finally, such a tailgate support is arranged at a height, which requires lifting the bicycle to a considerable height. This is difficult, in particular for particularly heavy electrically assisted bicycles.

[0004] In other types of vehicle, for example four-door, a support fixed to a tow ball is generally used. Such a support then clamps such a ball to hang on it. Thus, a tow bar must be mounted beforehand in order to be able to use such a tow bar. A tow bar is complex to install because it generally requires the removal of a rear shield or bumper, possibly an exhaust line and / or at least one wheel arch, and / or various elements so as to allow the lateral reinforcements of such a tow bar to be fixed to the side members of such a vehicle. In addition, modifications to certain original elements are necessary, for example cutting out such a rear bumper for the passage of the tow bar through it. The installation of a tow bar being long and tedious therefore requires the intervention of a professional after-sales service for the vehicle.As a result, this installation is also expensive. In addition, once the hitch is installed on the vehicle, a significant part of such a hitch remains fixed to the vehicle even if the ball, and obviously the bike rack, are removed between two uses. Indeed, side reinforcements and a cross member generally . remain attached to the chassis of such a vehicle, which makes the vehicle heavier. For example, the vehicle has an increased mass of approximately twenty kilograms. Such a situation is not optimal since it results in excess fuel consumption and consequently an increase in CO2 production, and, particularly in the case of an electric vehicle, a reduction in the autonomy of such a vehicle.

[0005] Furthermore, in these cases, the bicycle rack or holder is complex to install and is difficult, if not impossible, to accommodate in the trunk of the vehicle when not in use. Presentation of the invention

[0006] The aim of the invention is to provide an arrangement which overcomes the above drawbacks.

[0007] More specifically, an object of the invention is to propose a vehicle comprising a rear support whose assembly is simple and rapid, in particular intended to support bicycles, as well as a simple and rapid disassembly, so as to avoid the step of fixing a hitch on side members of a chassis of such a vehicle after-sales. Summary of the invention

[0008] To achieve this objective, the invention relates to an arrangement for a vehicle comprising: - a tank intended to store an energy fluid, the tank comprising a rigid structure intended to form part of a structure of an underbody of such a vehicle, the tank comprising a rear face extending along a vertical and transverse or substantially vertical and transverse plane, - a first shock-absorbing cross-member type element extending transversely and being arranged behind the tank, - a second central column-type element extending longitudinally between the rear face of the tank and the cross member, the central column being substantially centered relative to a median plane of such a vehicle, and comprising a main fixing means intended for fixing a towing hook, - a third element of the first lateral column type extending longitudinally between the rear face of the tank and the cross member, the first lateral column extending to the left of the median plane of such a vehicle, the first lateral column comprising a secondary fixing means intended for fixing a towing ring.

[0009] The main fixing means may comprise a thread provided in the central column, in particular a thread having an axis extending longitudinally.

[0010] The main fixing means may comprise a centering bore provided within the central column, in particular a centering bore having an axis confused or substantially confused with the axis of the tapping.

[0011] The secondary fixing means may comprise a thread provided in the first lateral column, in particular a thread having an axis extending longitudinally.

[0012] The arrangement may comprise a second lateral column extending longitudinally between the rear face of the tank and the crossmember, the second lateral column being able to extend to the right of the median plane of such a vehicle, in particular by being substantially the symmetry of the first lateral column with respect to the median plane.

[0013] The tank may be obtained from composite materials and may comprise through holes, in particular in the longitudinal and / or transverse and / or vertical direction, the through holes being able to allow the central column to be fixed and / or the first lateral column to be fixed and / or the second lateral column to be fixed, in particular by means of a base extending substantially in a vertical and transverse plane, the base then being able to be fixed on the rear face of the tank extending substantially in the same plane.

[0014] The invention also relates to a vehicle, in particular a motor vehicle, comprising an arrangement as defined above.

[0015] The vehicle may comprise a rear support, in particular a rear support intended to support at least one bicycle, the rear support comprising a main element cooperating with the main fixing means of the central column and a secondary element of the towing ring type cooperating with the secondary fixing means of the first lateral column for fixing the rear support relative to the arrangement.

[0016] The rear support may comprise a means for locking the rear support in position relative to the secondary element, in particular relative to a U of the secondary element.

[0017] The invention also relates to a method of assembling a vehicle capable of supporting a rear load, in particular a load comprising at least one bicycle, comprising: - a step of providing an arrangement as defined above and of providing a rear support, in particular a rear support intended to support at least one bicycle, the rear support comprising a main element and a secondary element, - followed by a step of fixing the rear support relative to the arrangement by cooperation of the main element of the rear support with the main fixing means of the central column, in particular by screwing, and by cooperation of the secondary element of the rear support with the secondary fixing means of the first co- side louver, in particular by screwing. Presentation of figures

[0018] These objects, characteristics and advantages of the present invention will be explained in detail in the following description of a particular embodiment made without limitation in relation to the attached figures among which:

[0019] [Fig.l] is a schematic side view of a motor vehicle according to one embodiment of the invention.

[0020] [Fig.2] is a perspective view of a part of the vehicle according to one embodiment of the invention.

[0021] [Fig. 3] is a perspective view from below of a part of the vehicle according to the embodiment of the invention.

[0022] [Fig.4] is a sectional view, along a vertical and longitudinal median plane M of the vehicle, of a part of the vehicle according to the embodiment of the invention.

[0023] [Fig. 5] is a sectional view, along a plane parallel to the vertical and longitudinal median plane M of the vehicle passing through the axis of a towing ring, of a part of the vehicle according to the embodiment of the invention.

[0024] [Fig.6] is a detailed perspective view of a part of the vehicle according to the embodiment of the invention.

[0025] [Fig.7] is a partially exploded perspective view of a part of the vehicle according to the embodiment of the invention.

[0026] [Fig.8] is a perspective view of a detail of a support of the vehicle according to the embodiment of the invention.

[0027] [Fig.9] is another perspective view of a detail of the vehicle support according to the embodiment of the invention. Detailed description

[0028] The direction in which a vehicle, in particular a motor vehicle, moves in a straight line is defined as the longitudinal direction X. By convention, the direction perpendicular to the longitudinal direction, located in a plane parallel to the ground, is called the transverse direction Y. The third direction, perpendicular to the other two, is called the vertical direction Z. Thus, a direct XYZ reference frame is used in which X is the longitudinal direction in the front-rear direction of the vehicle, therefore directed towards the rear, Y is the transverse direction directed towards the right and Z is the vertical direction directed upwards. The forward direction corresponds to the direction in which the vehicle usually moves in the longitudinal direction and is opposite to the rear direction.

[0029] As illustrated in [Fig.l], a vehicle 1, preferably a motor vehicle, comprises an arrangement 2. The vehicle 1, or the arrangement 2, comprises a tank 3. The vehicle also comprises a base 100 or lower part of a chassis. The tank 3 is intended to contain an energy fluid, that is to say a fluid forming a reserve of energy convertible into a force capable of moving the vehicle. The tank 3 is therefore a component of the vehicle 1 which gives it a certain autonomy. The tank comprises in particular an inlet opening allowing the tank to be filled with an energy fluid and an outlet opening for delivering and then consuming the energy fluid contained in the tank.

[0030] According to a preferred embodiment, the tank 3 is intended to store hydrogen or more precisely dihydrogen. The vehicle 1 then preferably comprises a fuel cell 5 capable of transforming hydrogen into an electric current and an electric motor 6 powered by an electric current from the fuel cell 5. The vehicle 1 may also comprise an electrochemical battery 7, for example of the lithium-ion type. The electrochemical battery 7 may be recharged by an electric current from the fuel cell 5 and / or by a connection to an electricity distribution network. The electric motor 6 may also be powered by an electric current from the electrochemical battery 7. The tank 3 associated with the fuel cell 5 may thus act as a range extender for the vehicle, when the electrochemical battery 7 is discharged.

[0031] Alternatively, the architecture of the vehicle 1 could be different. The vehicle 1 could not include an electrochemical battery, so that the tank 3 constitutes the sole energy source of the vehicle 1. According to another variant, the vehicle could include an internal combustion engine powered by hydrogen instead of a fuel cell. According to other variants, the tank 3 could be configured to store other forms of energy gases, for example liquefied petroleum gas or natural gas. The tank 3 could even be intended to store a liquid fuel such as gasoline, diesel or even ethanol.

[0032] The tank 3 is advantageously intended to store an energetic fluid under pressure, that is to say at a pressure strictly higher than atmospheric pressure. In this case, the tank 3 is intended to store the energetic fluid, in particular hydrogen, at a pressure greater than or equal to 700 bars. Alternatively, the tank 3 could be intended to store the energetic fluid at a different pressure, for example a pressure greater than or equal to 300 bars, or 500 bars, or 1000 bars, or any other value. The tank 3 thus comprises a rigid structure capable of withstanding the forces exerted by the pressurized fluid that it contains, that is to say centrifugal forces acting from inside the tank 3 and which tend to cause it to burst. In addition, the tank may have a capacity greater than or equal to 50 liters, preferably greater than or equal to 100 liters, or even greater than or equal to 150 liters.The tank structure is also able to withstand shocks. significant impacts, in particular impacts occurring in the event of an accident of the vehicle 1, without generating any leakage of the energy fluid to the outside. Accident data and / or simulations and / or crash tests make it possible to dimension the structure, in particular the required wall thicknesses, so that no leakage of energy fluid occurs, even for the most violent accidents. As illustrated in [Fig.2], the tank 3 typically comprises a generally parallelepiped shape. In this example, it comprises three pairs of opposing walls. A first pair of opposing walls is composed of a front wall (not illustrated) and a rear wall 3R. The front and rear walls extend substantially parallel to the Y and Z axes. A second pair of opposing walls is composed of a left side wall and a right side wall extending substantially parallel to the X and Z axes.A third pair of opposing walls is composed of an upper wall and a lower wall extending substantially parallel to the X and Y axes. Alternatively (not shown), any other shape of the tank could be envisaged. Advantageously, the tank 3 is arranged in the rear part of the vehicle. Above all, the tank 3 forms a rear part of a chassis of the vehicle 1, for example a rear part of the underbody 100 of the vehicle.

[0033] The tank 3 referred to in the invention is typically a polymorphic structural tank made of composite materials using a weaving process similar to that presented in document FR 2888915Al. This tank comprises internal reinforcement wells which pass through the interior volume of the tank and which connect two by two of the opposite walls of the tank 3 so as to secure them together. This structure and this geometry ensure mechanical support of the tank suitable for receiving high-pressure gases, in particular for containing hydrogen. The tank being rigid, it is therefore used as a structural element of the vehicle, in addition to the conventional structural elements of the underbody 100 of the vehicle. In other words, the tank comprises a rigid structure intended to form part of a structure of the underbody 100 of the vehicle 1.As a reminder, the tank 3 comprises a rear wall or face 3R extending along a vertical and transverse or substantially vertical and transverse plane.

[0034] The tank 3 comprises through holes 3H, for example holes 3H extending in several directions, for example in the longitudinal direction and / or in the transverse direction and / or in the vertical direction. Advantageously, each hole 3H comprises an insert, for example a tube-shaped insert, preferably metallic, so as to stiffen the structure of the tank 3 by passing right through the tank, preferably by joining two walls of the same pair of opposite walls. Preferably, as illustrated in [Fig. 3], the vehicle 1, or the base 100, or the arrangement 2, comprises a base 60 extending substantially in a vertical and transverse plane. The base 60 is preferably a flat or substantially flat sheet metal for example. Preferably, the base 60 is fixed to the rear face 3R or rear wall of the tank 3. Preferably, the fixing of the base 60 is ensured by fixing means passing through holes 3H extending in the longitudinal direction. Note that the holes passing through 3H are only illustrated schematically in [Fig.3] so as not to overload the other figures.

[0035] The arrangement 2 comprises a first structural element of the shock-absorbing crossmember type 11. Preferably, as illustrated in Figures 2, 3 and 4 in particular, the crossmember 11 is arranged behind the tank 3. The shock-absorbing crossmember 11 is preferably of the beam type made of steel and / or aluminum alloy. The crossmember 11 extends transversely or substantially transversely, for example forming a slight curve, the concave side of the curve being oriented towards the front of the vehicle so as to maximize the absorption of energy during an impact coming from the rear. Thus, preferably, the crossmember 11 is arranged within a rear bumper 9 of the vehicle 1 shown schematically in [Fig. 1]. Preferably, damping elements, for example in the form of a honeycomb, extend within the internal volume of the bumper, that is to say between the cross member 11 and the shell of the bumper. Indeed, preferably, the bumper is of the hollow shell type.For example, the assembly comprising the cross member 11, the shock-absorbing elements (not shown) and the rear bumper 9 constitutes a shock-absorbing device 10 for impacts coming from the rear or substantially from the rear, for example rear side impacts.

[0036] The arrangement 2 further comprises a second structural element of the central column type 20. As illustrated in [Fig. 2] in particular, the central column 20, for example of the beam piece or beam type, extends longitudinally while being centered or substantially centered relative to a vertical and longitudinal median plane M of the vehicle 1. More precisely, the central column 20 extends longitudinally between the rear face 3R of the tank 3 and the cross member 11. For example, the beam 20 is a hollow body and the section of the beam 20 in a vertical and transverse plane is square or rectangular. The central column 20 comprises a fixing means 21 for a tow hook which will be detailed later in particular with reference to [Fig. 4]. The central column 20 is preferably fixed to the cross member 11, for example by welding.

[0037] As illustrated in [Fig. 3] in particular, the arrangement 2 further comprises a third structural element of the first lateral column type 4L. The first lateral column is then arranged to the left of the median plane M of the vehicle. The first column 4L is a piece of beam or girder extending longitudinally. More precisely, the first lateral column 4L extends between the rear face 3R of the tank 3 and the crossmember 11. For example, the first lateral column 4L is a hollow body and the section in a vertical and transverse plane is square or rectangular. The first lateral column 4L is preferably fixed to the cross member 11, for example by welding. As illustrated in [Fig.5], the first lateral column 4L comprises a secondary fixing means 42 intended for fixing a towing ring 70.

[0038] Preferably, as illustrated in particular in Figures 2, 3 and 7, the vehicle 1, or the base 100 of the vehicle 1, or the arrangement 2, or the rear bumper 9, comprises a transverse reinforcement 50. The reinforcement 50 preferably extends mainly in a transverse and longitudinal plane, possibly forming a curve, substantially close to that formed by the crossmember 11 for example. In addition, the vehicle 1, or the base 100 of the vehicle 1, or the arrangement 2, comprises a second lateral column 4R illustrated in [Fig. 3] in particular. The second lateral column 4R is then arranged to the right of the median plane M of the vehicle. The second column 4R is a piece of beam or girder extending longitudinally. More precisely, the second lateral column 4R extends between the rear face 3R of the tank 3 and the crossmember 11.For example, the second lateral column 4R is a hollow body and the section in a vertical and transverse plane is square or rectangular. The second lateral column 4R is preferably fixed to the cross member 11, for example by welding. Preferably, the second lateral column 4R is substantially the symmetry of the first lateral column 4L with respect to the median plane M of the vehicle.

[0039] For example, the reinforcement 50 is obtained from the same material as the columns 20, 4L, 4R, for example made of aluminum alloy and / or steel. Preferably, the reinforcement 50 is fixed to the lateral columns 4R, 4L and to the central column 20, for example by welding.

[0040] More preferably, the reinforcement 50 is fixed respectively to a front part of each lateral column 4R, 4L and to a front part of the central column 20. In this case, as illustrated in particular in [Fig. 2], each lateral column 4R, 4L comprises two separate parts, respectively a front part 40R, 40L and a rear part 41R, 4IL. The central column 20 then also comprises two parts, a front part 25 and a rear part 26. Advantageously, as illustrated in [Fig. 3], the front part 25 of the central column 20 comprises a front plate 27, or junction plate, and the rear part 26 of the central column 20 comprises a rear plate 28, or junction plate. Preferably, each plate 27; 28 extends substantially in a vertical and transverse plane.More preferably, each plate 27; 28 is drilled so as to allow them to be fixed relative to each other by at least one bolt, or a plate is provided with at least one added nut or at least one added threaded rod so as to allow the fixing of one with. the other by screwing. Thus, the front part 25 of the column 20 and the rear part 26 of the column 20 are fixed to each other in a removable manner. Preferably, the transverse reinforcement 50 is fixed, for example by welding, only on the front part 25 of the central column 20.

[0041] Preferably, as illustrated in [Fig. 3], each front part 40R, 40L and each rear part 41R, 41L, respectively of each lateral column 4R, 4L comprises a junction 42R, 42L of the same type, i.e. via two plates or plates, preferably bolted together, so as to allow removable fixing of each rear part 41R, 41L with each front part 40R, 40L of each lateral column 4R, 4L. Preferably, the transverse reinforcement 50 is fixed, for example by welding, only on each front part 40R, 40L or at the level of each front part 40R, 40L in the case of an element and / or part inserted between the reinforcement 50 and the respective front part 40R, 40L. Thus, each side column is preferably in two parts and the central column is also in two parts which can be removed from each other.

[0042] Advantageously, the through holes 3H of the tank 3 are used for fixing the central column 20 on, relative to, the tank. In addition or alternatively, the holes 3H are used for fixing the base 60 to the tank 3 as mentioned previously. In this case, the central column 20 is fixed to the base 60. More precisely, the first part or front part 25 of the column 20 is fixed to the base 60, preferably by welding. In other words, in this case, the front part 25 of the column 20 is for example part of the base 60. Optionally, the through holes 3H allow the fixing of the first lateral column 4L and / or the fixing of the second lateral column 4R on the, relative to the, tank 3. Optionally, this fixing is done by means of the base 60. As a reminder, the base 60 is preferably fixed on the rear face 3R of the tank and extends substantially in the same plane.For example, the front portions 40R, 40L of the first and second side columns are part of the base 60, for example by being fixed to the base, preferably by welding.

[0043] Preferably, as illustrated in particular in [Fig. 4], the fixing means 21 comprises a thread 22 provided in the central column 20. For example, the thread 22 is provided in the front part 25 of the column. For example, the thread 22 is provided in, within, the front plate 27. For this purpose, the front plate 27 comprises an extension, a circular tubular part, towards the front, for example extending within the hollow section of the front part 25. Preferably, the thread 22 has an axis A22 extending longitudinally or substantially longitudinally. For example, the fixing means 21 further comprises a centering bore 23 provided within the central column 20. For example, the bore of centering 23 is provided in the rear part 26 of the central column 20. For example, the centering bore 23 is provided in, within, the rear plate 28 of the column. For this purpose, the rear plate 28 comprises a circular tubular extension or part, towards the rear, for example extending within the hollow section of the rear part 26. Preferably, the centering bore 23 has an axis A23 coincident or substantially coincident with the axis A22 of the tapping 22. Thus, for example, it is the front and rear plates 27, 28 which comprise the fixing means 21 initially intended for the fixing of a towing hook (not illustrated). For example, the centering bore 23 extends over a length of between 20 mm and 200 mm. For example, the length of the thread 22 for a tow hook ranges from 20 mm to 60 mm. In [Fig. 4], a threaded portion 91 of a fixing pin 90 of a plate 81 of a support 80 is illustrated and will be explained later.The fixing axis 90 of the support 80 cooperates in the tapping 22. In this configuration, the diameter of the centering bore 23 is greater than the diameter of the threaded part, the threaded part passing through the centering bore 23 before its insertion into the tapping 22. For example, the diameter of the threaded part is between 20 mm and 30 mm. For example, the thread length of the threaded part 91 is between 20 mm and 40 mm. Note that the crossmember 11, and where appropriate the rear bumper, preferably include orifices for the passage of the axis of a tow hook. These orifices then allow the passage of the fixing axis 90 to fix the support 80.

[0044] Alternatively, the thread is provided in the rear part of the central column, for example in the rear plate. For example, in this case, the centering bore is provided in the front part, for example in the front plate. In this configuration, not shown, the diameter of the centering bore is less than the diameter of the threaded part.

[0045] As illustrated in [Fig. 5], the secondary fixing means 42 of the first lateral column 4L comprises a thread 43 formed in the first lateral column 4L. Preferably, the thread 43 is formed in the rear part 4IL of the first lateral column 4L. For this, an extension or projection is formed within the rear part 4IL. The thread 43 has an axis A43 extending longitudinally, or substantially longitudinally. The thread 43 makes it possible to receive the threaded part of an axis 72 of a towing ring 70. Note that the cross member 11, and where appropriate the rear bumper, preferably comprise orifices for the passage of the axis 72 of the towing ring 70.

[0046] The vehicle 1 also comprises the rear support 80 mentioned previously, and illustrated in particular in FIGS. 1, 2 and 7. More precisely, the rear support 80 is preferably intended to support at least one bicycle, for example two, three or even four bicycles, or even more. For this purpose, the support 80 comprises preferably a plate 81 extending substantially in a longitudinal and transverse plane. The support 80 or the plate 81 comprises at least one rail 82 extending transversely to the horizontal, preferably several rails 82 parallel to each other. For example, a rail 82 is intended to participate in the fixing of a single bicycle on the support 80. As illustrated in [Fig.7], the plate 81 preferably comprises the rails 82 fixed, for example by welding, on three metal plates 811, 812R, 812L extending longitudinally. The metal plate 811 located between the two other plates 812R, 812L is fixed, for example by welding, on a tube 83 in which the fixing axis 90 rotates during assembly or disassembly. The two metal plates 812R, 812L serve as a connection for the rails 82, the plate 812L arranged on the left side participating in the anti-rotation function of the support 80 as will be seen later.

[0047] Preferably, the support 80 comprises a vertical upright 84 extending substantially in the vertical direction. For example, the vertical upright 84 is a metal tube, for example of square or rectangular section, extending substantially vertically while being centered or substantially centered relative to the median plane M. Preferably, the support 80 comprises at least one holding bar 85, for example two holding bars 85. The bar(s) 85 extend rearwardly in the longitudinal direction from an upper end 843 of the vertical upright 84. Optionally, the upper end 843 comprises a transverse bar or a flat 844 extending transversely and allowing the holding bars 85 to be fixed.

[0048] The rear support 80 further comprises a main element 90, 91, 92 cooperating with the main fixing means 21 formed in the central column 20. Indeed, as illustrated in [Fig.4], the support 80 comprises the axis 90 for fixing the plate 81. The axis 90 comprises the thread 91 intended to cooperate with the tapping 22 of the central column 20. The axis 90 further comprises a cylindrical part 92 intended to be centered within the centering bore 23 of the central column 20. As mentioned, the axis or shaft 90 uses the fixing means 21 provided for a specific tow hook. Preferably, as illustrated in Figures 4 and 7, the axle 90 also comprises a shoulder or bead 94. The support 80, in particular its plate 81, comprises a bore or tube 83 intended to partially receive the axle 90. Thus, the bead 94 creates a stop preventing the tube 83, and therefore the plate 81, from moving towards the vehicle.Indeed, as a reminder, the front end of the shaft 90, more precisely the threaded part 91, is screwed into the tapping 22. Preferably, the shaft 90 comprises a head 95 arranged at the other end (i.e. the rear end of the shaft 90 opposite the threaded part 91) provided with an imprint or shape, for example with four sides, two of which are very wide, to facilitate the screwing of the shaft 90 into the tapping 22 by hand. Alternatively, the rear end comprises a hexagon or other requiring a key for screwing / unscrewing the shaft 90 into the tapping 22.

[0049] The support 80 also comprises a secondary element 70 of the towing ring type illustrated in particular in FIGS. 5 and 6. The axis 72 of the towing ring cooperates by screwing into the thread 43 of the secondary fixing means 42 of the first lateral column 4L. Indeed, a towing ring comprises a first threaded end and a second end equipped with a ring 71 or U, configured to create an opening 73, an orifice, easy to hook with a tow bar or with a hook connected to a winch. Thus, the solution aims to use a conventional towing ring to complete the fixing of the support 80 on the vehicle 1.

[0050] More precisely, as illustrated in [Fig.6], the fixing of the rear support 80 relative to the arrangement 2 is completed by the fact that the rear support 80 comprises a locking means in position 86, 87, 88, 89 cooperating with the ring 70, in particular with its orifice 73. Indeed, the support 80, more precisely its plate 81, comprises an extension or projection 86 extending under the plate, downwards, preferably extending in the vertical direction. The extension 86 is such that it can extend within the orifice 73 formed in the ring 71 or U of the towing ring 70. Preferably, the extension 86 comprises a hole or bore 861 extending in the transverse direction, allowing the insertion of an axis 87 then protruding on either side of the U of the towing ring. For example, the axis 87 comprises a shoulder 871 extending radially so as to come into contact with a first bar of the U of the ring 70.The rear support 80 or the axle 87 further comprises a washer 88 coming into contact with the second bar of the U of the ring 70. Thus, the axle 87 sandwiches the two bars of the U of the ring 70 between the shoulder 871 and the washer 88, the axle 87 extending within the orifice 861 of the extension 86, under the U of the ring 70. Advantageously, the axle 87 comprises a radial hole 872 and a pin 89 is inserted within the radial hole so as to hold the washer 88 in position. In other words, a pierced finger 86 extends downwards from the flat 812L and enters the opening 73 of the towing ring 70. The axle 87 blocks the finger 86 in the ring from below. The large washer 88 and the wide head of the pin 87 lock the towing ring on each side. The reliable holding in position of the assembly and therefore safety are ensured by the elastic pin 89 which is mounted through the end of the pin 87 provided with the hole 872.The locking in rotation and / or in translation of the support, in particular of its plate 81, is thus achieved by means of the towing ring.

[0051] Thanks to the position locking means cooperating with the towing ring, the tube 83 of the plate 81 cannot rotate around the axis 90 for fixing the plate in the central column 20. In fact, the locking means prevents the plate 81 from pivoting around the axis 90, the extension 86 blocking in a first direction of rotation (counterclockwise) by contact against the ring, and the axis 87 extending under the ring, blocking in the second direction of rotation (clockwise).

[0052] Obviously, to obtain such a configuration for mounting and holding the support 80 in position, the axis 72 of the towing ring 70 is screwed into the tapping 43 of the first lateral column 4L so that the U extends in a transverse and longitudinal plane, or substantially in a transverse and longitudinal plane.

[0053] As illustrated in [Fig.4], the arrangement, at least the central column 20, comprises a deflection means 29 in the event of an impact coming from the rear of the vehicle and causing an advancement of the axis 90 for fixing the support 80, or alternatively, of a towing ring 70 fixed to the fixing means 21 in the absence of use of the support 80 and the mounting of a ring at this level. Preferably this deflection means 29 is a V, for example having substantially the shape of an angle extending vertically, a junction 291 between the two wings of the angle being substantially centered relative to the median plane M of the vehicle. Preferably, the junction or the bottom of the V extends vertically. For example, the angle iron is fixed within the column 20, for example by being welded to the front part 25 of the column, for example via spot welds.The wings of the angle iron then extend towards the front of the vehicle so that in the event of an impact causing the threaded part 91 and the cylindrical part 92 to move forward, the threaded part 91 is deflected to the right or left by sliding against one of the two wings of the angle iron. Advantageously, the end of the threaded part 91 of the axis 90 is rounded and / or conical so as to facilitate the change of direction (to the right or to the left) when in contact with the junction 291 between the two wings of the angle iron if necessary.

[0054] Alternatively, the junction of the angle iron can extend transversely so as to direct the axis 90 downwards or upwards in the event of an impact.

[0055] Alternatively, a simple sheet metal arranged vertically within the central column, for example oriented at 45 degrees relative to the median plane M of the vehicle, causes the axis 90 to deflect necessarily to one side only, that is to say to the right or to the left, in the event of an impact causing the axis 90 to move forward. Alternatively, the sheet metal extends so as to rise towards the rear in order to direct the axis downwards in the event of a rear impact, or the sheet metal extends so as to descend towards the rear in order to direct the axis upwards in the event of a rear impact. In any event, the objective is to prevent the threaded part 91 and / or the cylindrical part 92 from damaging the tank 3 by striking it in the event of a violent rear impact, although the structure of the tank is particularly rigid.

[0056] An embodiment of a method of assembling the vehicle 1 comprising the rear support 80 will now be described.

[0057] In a first step, an arrangement 2 is provided, for example a vehicle 1 comprising the arrangement 2. As a reminder, the arrangement 2 comprises the tank 3, the cross member 11, the central column 20 and the first lateral column 4L. The central column 20 comprises the main fixing means 21, the main fixing means comprising the tapping 22. The first lateral column 4L comprises the secondary fixing means 42, the secondary fixing means 42 comprising the tapping 43.

[0058] In this first step, the rear support 80 is also provided, preferably intended to support at least one bicycle. The rear support 80 comprises the main element of the axle type 90 comprising the threaded portion 91. The rear support 80 further comprises the secondary element 70 of the towing ring type comprising the axle 72 having a thread.

[0059] First, the axis 72 of the towing ring 70 is made to cooperate with the secondary fixing means 42 of the first lateral column 4L, that is to say the thread 43. Thus, the threaded part of the towing ring is screwed into the thread 43 of the first lateral column 4L. As a reminder, the position of the ring after screwing into the thread 43 is such that the orifice 73 within the rear end of the ring 70 extends along the vertical axis, in other words that the U extends in a transverse and longitudinal plane.

[0060] Next, the step of fixing the rear support 80 relative to the vehicle 1, i.e. relative to the arrangement, is carried out. For this, the main element, namely the axis 90, more precisely the threaded part 91, is made to cooperate with the main fixing means 21, namely the tapping 22 of the central column 20. Thus, the threaded part 91 of the axis 90 is screwed into the tapping 22, in particular by acting on the imprint 95 of the axis 90 located at the rear end of the axis 90, manually or with a key adapted to this imprint. Preferably, a shoulder between the threaded part 91 and the cylindrical part 92 creates an end-of-screwing stop in the tapping 22. Preferably, a clearance is provided between the cylindrical part 92 and the centering bore 23 so as not to hinder the screwing of the threaded part 91 into the central column.

[0061] Note that simultaneously with this screwing of the axis 90, the extension 86 of the plate 81 is made to cooperate, to be inserted, within the U of the ring. As soon as possible, for example, the shouldered axis 87 is inserted under the U, in the hole 861 of the extension, before placing the washer 88 and finally the pin 89. Thus, the degree of freedom in rotation of the support 80 around its fixing axis 90 in both directions is eliminated. In addition, the cooperation of the projection 86 in the U of the ring 70 prevents translation in the longitudinal direction, towards the rear, of the support 80, in particular along its tube 83. As a reminder, the bead 94 prevents the forward translation of the support 80 on its axis 90. Preferably, the axis 90 is fitted substantially without play in the tube 83 so as to limit the risk of loosening of the threaded part 91.

[0062] For disassembly, the procedure is reversed. First, in order to save weight and therefore improve the handling of the support, the bicycles are lowered from the support 80. For the same reasons, the vertical upright 84 equipped with its bar 844 and its longitudinal bars 85 can be removed from the plate 81 via an axle 841.

[0063] First the pin 89 is removed, then the washer 88 from the axle 87. The axle 87 is then removed from the bore 861 of the projection 86. It is only once the axle 87 has been removed and the support 80 or the plate 81 has been pivoted a few degrees clockwise around its axis 90 to offset the projection 86 vertically relative to the U of the ring 70 that the axle 90 can be unscrewed from the main column 20. This unscrewing, in particular via the imprint 95, effectively translates the support 80 towards the rear due to the bead 94 forming a stop against the tube 83. After unscrewing, the entire support is extracted and stored until the next use. Optionally, if necessary, a cover is placed within the hole made in the bumper 9 for the insertion of the fixing axis 90 in order to obtain a neat finish of the bumper.Preferably, the towing ring 70 is removed by unscrewing it from the thread 43 and stored in its intended location, generally at the bottom of the trunk between hooks which hold it in position. Optionally, if necessary, a cover is placed within the hole made in the bumper 9 for the insertion of the ring 70 in order to obtain a neat finish of the bumper.

[0064] In the absence of a towing hook and an axis 90 for fixing the support 80 within the central column 20, it is possible to fix the towing ring if necessary. Advantageously, the threaded parts of a towing hook specific to this arrangement, of the towing ring and of the axis 90 for fixing the rear support 80 have the same diameter and the same pitch, or even the same thread length and / or a shoulder arranged at the same level relative to the thread length. Preferably, this threaded end of the ring 70, of a specific towing hook and of the axis 90 is curved so as to cooperate with the deflection means 29 arranged in the central column and intended to deflect this end in the event of a rear impact. In other words, the towing ring 70 can be fixed either on the central column 20 or on the first lateral column 4L. Note that the central anchoring facilitates and secures the towing of a vehicle.Indeed, a central anchor is easier to use than a lateral anchor, especially when the front lateral anchor of the vehicle to be towed is on the opposite side to that of the towing vehicle, the tow bar extending substantially at 45 degrees in a substantially transverse and longitudinal plane. Such towing reduces the distance between the two vehicles, which is not recommended in terms of road holding and / or safety. Thus, the solution avoids . such a disadvantage when towing, in the absence of support 80 mounted on the vehicle 1.

[0065] In summary, the solution involves fixing a bicycle rack directly to the chassis or underbody of a vehicle using the fixing method of a towing ring. This is possible thanks to the presence of the tank made of very rigid composite materials which is nested in the chassis, which reinforces the rear underbody.

[0066] The solution is particularly suitable for a vehicle having a structure, a rigid rear base, reinforced by the integration into this rear structure of the structural tank 3. Indeed, the presence of the tank 3 integrated into the base 100 stiffens the rear structure of the vehicle. Thus, it becomes possible to add the central column or side member 20, at the level of the median plane of the vehicle so as to allow either the mounting of an extremely quick-mounting hitch (not shown), or the mounting of the rear support intended for example for the transport of several bicycles. Note that the centering 23 associated with the cylindrical part 92 of the fixing axis 90 also provides greater robustness.

[0067] Thanks to the solution, it becomes possible to transport several bicycles on the same support without resorting to the complex, tedious, long and consequently expensive assembly of a hitch on the side members of the vehicle. Indeed, there is no need to dismantle the rear part of the vehicle comprising a shield and retaining brackets, shock blocks for example of the honeycomb type, plugs on side members, supports of an exhaust line or even plastics under the trunk and wheel arches. Indeed, thanks to the solution, the rear support 80 does not use the side members of the vehicle although it can support several bicycles. Thus, there is no need to fix elements under the vehicle. There is therefore no fixing of large bolts which require large tools under the vehicle.Finally, no modification of the vehicle, such as for example a cutting of the bumper, is necessary for the passage of the axis 90 of the main fixing of the support 80. This therefore eliminates the need for an intervention within a garage and consequently the cost of such an intervention.

[0068] Furthermore, installing the bicycles on the support 80 is less tiring than on a bicycle rack fixed on a tailgate, in particular because the bicycles do not have to be raised to a significant height. In addition, it is possible to attach several bicycles easily, which is difficult or even impossible on a bicycle rack mounted on a tailgate.

[0069] Unlike the prior art in which each vehicle has its own width between the two main side members used to fix a towbar with ball, the solution allows the same bicycle support to be used for several types of vehicles, only the center distance between the two threads 22, 43 being to be respected on the underbody of the vehicles. Alternatively, the projection 86 extending downwards from the plate 81 is adjustable in the transverse direction on the plate 81 so that the center distance between the two threads 22, 43 becomes free, or substantially free. Thus, it becomes possible to make economies of scale by producing only one model of bicycle rack. Indeed, the side members can be fixed with the same center distances for several types or ranges of vehicle because they are fixed relative to the tank, or even on the tank, and are not the extensions of side members extending in the central part of the vehicle. In the case of using the tank 3 for several models, it is possibly the entire arrangement which can be transposed and used for several vehicles having large differences in terms of chassis.

[0070] Thus, the rigidity provided by the tank 3 is used to add the central column fixed directly or indirectly to the tank 3. Indeed, as seen previously, for example the column is fixed for example to the base 60 itself fixed directly to the tank 3. Preferably, a thin sheet or protection is provided between the base 60 and the tank 3. Indeed, the base 60 is for example made of steel or aluminum alloy while the tank 3 is made of composite materials which generates different vibration frequencies. Such a protective sheet aims to act as a screen between the two to prevent wear of the external surface of the tank and / or the surface of the base 60 by friction resulting from the differences in vibration frequencies.

[0071] Thus, while a hitch of the state of the art remains permanently on the vehicle once mounted, the solution allows the entire support 80 to be dismantled easily, quickly, possibly without tools. Optionally, the vertical upright 84 forms a T with the transverse bar 844 at the end 843 of the upright, for example by being welded together. In addition, the vertical upright 84 is preferably removable relative to the plate 81 in order to be able to reduce the size of the support and possibly store it in the trunk of the vehicle. Indeed, for example, as illustrated in FIGS. 5, 8 and 9, an axis 841, for example provided with a ball 842 with a spring at its end opposite that comprising a head extending radially, allows mounting / dismounting of the upright 84 relative to the plate 81.Thus, the upper part of the T-shaped bicycle rack is removable from the main lower part via a tubular part 843 extending vertically from the plate 81, preferably from a front end 813 of the central plate 811 (see [Fig.7]). Thus, the upright 84 is plugged, inserted, within the tubular part 843, preferably with a small clearance. For example, the section of the tubular part 843 is rectangular or substantially rectangular, and the section of the upright 84 is rectangular or substantially rectangular. As illustrated in particular in Figures 8 and 9, the tubular part 843 is pierced along an axis extending longitudinally and the upright is also pierced along an axis extending longitudinally so that the . holes align once the upright 84 is inserted into the tubular part 843. Thus, the cooperation between the part 843 and the upright 84 ensures positioning mainly while ensuring a stop in the vertical downward direction. Indeed, the tubular part 843 is not open, or opens opposite the central plate 811. The axis 841 passes through the assembly of the elements 84, 843 and ensures holding in position in the vertical upward direction, the presence of the ball 842 preventing the inadvertent extraction of the axis 841. Note that this simple, basic assembly can allow the tray or main part 81 to be mounted first on the vehicle, then the T-pillar to be assembled in a second step. As a result, the weight of the T including the bars 85 is eliminated during assembly, by separating it from the plate 81, during assembly on the vehicle if necessary. The same applies to disassembly as mentioned previously.Disassembly of the assembly is made easier and storage of the 80 support is easier compared to a non-disassemblable bicycle rack. Optionally, a reinforcing tab 845 extends rearwardly between the tubular part 843 and the central plate 811, for example by being welded to the tubular part 843 and to the central plate 811, as illustrated in FIGS. 5, 8 and 9. The role of the reinforcing tab 845 is to stiffen the tubular part 843 relative to the plate 81 in order to hold the upright 84 rigidly on the plate 81. Optionally, the reinforcement 845 is pierced and crossed by the axis 841, in particular to ensure its retention on the tubular part 843. Optionally, the two tubes or bars 85 intended to hold, attach, immobilize, the bicycle(s) at the level of their respective frame for example, can be foldable (not illustrated) relative to the mast 84 so as to obtain a gain in space when the support is dismantled and stored.

[0072] The solution therefore makes it possible to avoid the need to install a towbar with a ball to fix a bicycle rack. Once the bicycle rack has been removed and stored elsewhere than in the vehicle, the mass of the vehicle is not penalized by a heavy towbar. This lowers the fuel consumption of the vehicle thus equipped and consequently lowers its CO2 production and / or increases its autonomy in the case of an electric vehicle in particular. In addition, the use of the towing ring, always present in the vehicle, avoids the addition of an additional part, which represents a saving in terms of manufacturing and avoids weighing down the vehicle.

[0073] Thus, the structure of the vehicle chassis comprises the extremely rigid tank 3 which extends over the entire width in the transverse direction of the chassis, the front parts 40R, 40L of the columns or side rails extending from the tank and preferably replacing side rails. The structure comprises the front part 25 of the central side rail 20. As a reminder, the three side rails 40R, 40L, 25 (front parts) are structural and mounted directly on the tank 3, or via the base or interface 60. Preferably, the vehicle body is welded to these elements in sheet metal in addition to the sheet metal floor for example. At the rear end, i.e. at the rear parts 41R, 41L, 26, the cross member 11 for impacts extends transversely and is fixed to these elements, preferably by welding. The three columns or rear parts 41R, 41L, 26 are preferably bolted to the side members 40R, 40L, 25 which allows rapid disassembly and replacement in the event of a collision deforming only the columns and the cross member 11. Thus, repair following a minor accident is quick, easy, and inexpensive. In other words, thanks to the solution, the rear part comprising the side members 41R, 26, 41L is easily interchangeable.

[0074] As mentioned, the solution allows a towing ring 70 to be mounted in place of the main fixing means of the support, simply by screwing it through the rear shield or bumper 9 as is generally the case for a towing ring. Thus, a user or a breakdown service or emergency personnel can easily install a towing ring, intuitively, for example by unclipping a central cap or cover in the rear bumper if it is available.

[0075] Preferably, the cylindrical bar 92 is guided and centered in the bore 23 formed in the central column, the central bore being for example a welded internal tube. As mentioned previously, a means 29 for deflecting the cylindrical bar of the hook is provided for safety purposes. Thus, in the event of a significant impact on the axis 90, a tab or thick sheet 29, for example V-shaped, for example welded in the column 20, directs the axis 90 to one side, or in other embodiments not illustrated upwards or downwards. As a reminder, for this purpose, the front end of the axis 90, at the level of the front face of the thread 91, is advantageously rounded. This prevents perforation, or at least damage, to the tank 3 preferably intended to store pressurized hydrogen, which is potentially flammable or even explosive.

[0076] Thus, the central part of the bar type, in particular cylindrical, rigid, robust, of the axis 90 does not remain perpendicular to the rear face 3R of the tank extending in a transverse and vertical plane during an impact, this bar is forced to become as parallel as possible to the rear face of the tank, so as not to damage it during a crash. Preferably, an opening or orifice, in the shield or bumper 9, for the passage of the cylindrical bar 90 is similar to that intended for a towing ring 70, that is to say with a cap that can be unclipped and reclipped.

[0077] In conclusion, the user can himself carry out the installation of the rear support 80 since no major disassembly or major assembly is necessary. In addition, the support 80 is also very simple to disassemble, an operation that the user can also do himself if he does not use it for a long period. Given the absence of a large steel cross member and its reinforcing arms on the side members, the rear structure is not modified when the 90 axle and the 70 ring are not mounted. In addition, no or only basic tools, such as a wrench possibly, are useful for the assembly / disassembly of the 90 axle and the towing ring. After disassembly, it is sufficient to reclip the shield or bumper caps if applicable.

[0078] Note that after dismantling the rear support 80, the rear structure becomes entirely original again. Thus, the structure is identical to its configuration which allowed the approvals for crashes, unlike the structures of vehicles retaining a hitch mounted on the side members and having repercussions in terms of safety in the event of a rear impact. Indeed, in the case of a hitch mounted on the side members and / or cross member of the chassis, this configuration is not tested and is a fortiori not approved.

[0079] As mentioned, no excess weight remains on the vehicle when the bike rack is not in use. In addition, the dismantled bike rack has an extremely small footprint, making it easy to store between uses.

[0080] Note that the central column 20 is connected to the crosspiece 11 and to the transverse reinforcement 50 which are themselves fixed directly or indirectly to the longitudinal members 4R, 4L, and finally, where appropriate, to the base 60 fixed to the tank 3. Thus, this assembly around the column 20 supporting the fixing means 21 is particularly rigid, solid, in particular thanks to all these connections, welded and / or bolted.

[0081] Although it is the first lateral column 4L which comprises the secondary fixing means for locking the support 80 in position, alternatively, it could be the second lateral column 4R, arranged to the right of the median plane M which receives the towing ring to cooperate with a means for locking the support (embodiment not illustrated). In any case, if the two lateral columns are equipped with internal threads and the crossmember 11 and the bumper are adapted, if a thread of one of the lateral columns is available, it can for example be used to fix a towing ring to recover another vehicle or to pull the vehicle 1 in a difficult situation, for example stuck in a ditch, and / or bogged down, and / or stuck in the sand.

[0082] In another embodiment not illustrated, the rear columns may be more than three, for example two columns then being central and preferably at equal distance on either side of the median plane M of the vehicle. In this case, each central column allows the attachment of a threaded bar and the bicycle rack is attached to the two threaded bars screwed inside the two central columns. In this case, it is possible to dispense with the use of a towing ring.

[0083] The invention is particularly suitable for a vehicle, in particular a motor vehicle, and can be used for a truck, a bus, a coach, an agricultural machine, a lifting machine and any other vehicle having a structural and rigid rear tank.

Claims

Claims

1. Arrangement (2) for a vehicle (1) comprising: - a tank (3) intended to store an energy fluid, the tank (3) comprising a rigid structure intended to form a part of a structure of a base (100) of such a vehicle (1), the tank (3) comprising a rear face (3R) extending along a vertical and transverse or substantially vertical and transverse plane, - a first element (11) of the shock-absorbing crossmember type extending transversely and being arranged behind the tank (3), - a second element (20) of the central column type extending longitudinally between the rear face (3R) of the tank (3) and the crossmember (11), the central column (20) being substantially centered relative to a median plane (M) of such a vehicle (1), and comprising a main fixing means (21) intended for fixing a towing hook,- a third element (4L) of the first lateral column type extending longitudinally between the rear face (3R) of the tank (3) and the cross member (11), the first lateral column (4L) extending to the left of the median plane (M) of such a vehicle (1), the first lateral column (4L) comprising a secondary fixing means (42) intended for fixing a towing ring (70).,

2. Arrangement (2) according to the preceding claim, characterized in that the main fixing means (21) comprises a thread (22) formed in the central column (20), in particular a thread (22) having an axis (A22) extending longitudinally.

3. Arrangement (2) according to the preceding claim, characterized in that the main fixing means (21) comprises a centering bore (23) formed within the central column (20), in particular a centering bore (23) having an axis (A23) merged or substantially merged with the axis (A22) of the tapping (22).

4. Arrangement (2) according to one of the preceding claims, characterized in that the secondary fixing means (42) comprises a thread (43) provided in the first lateral column (4L), in particular a thread (43) having an axis (A43) extending longitudinally.

5. Arrangement (2) according to one of the preceding claims, characterized in that the arrangement (2) comprises a second lateral column (4R) extending longitudinally between the rear face (3R) of the tank (3) and the crosspiece (11), the ... right of the median plane (M) of such a vehicle (1), in particular being substantially the symmetry of the first lateral column (4L) with respect to the median plane (M).

6. Arrangement (2) according to one of the preceding claims, characterized in that the tank (3) is obtained from composite materials and comprises through holes (3H), in particular in the longitudinal and / or transverse and / or vertical direction, the through holes (3H) allowing the fixing of the central column (20) and / or the fixing of the first lateral column (4L) and / or the fixing of the second lateral column (4R), in particular by means of a base (60) extending substantially in a vertical and transverse plane, the base (60) then being fixed on the rear face (3R) of the tank extending substantially in the same plane.

7. Vehicle (1), in particular a motor vehicle, characterized in that it comprises an arrangement (2) according to one of the preceding claims.

8. Vehicle (1) according to the preceding claim, characterized in that the vehicle (1) comprises a rear support (80), in particular a rear support (80) intended to support at least one bicycle, the rear support (80) comprising a main element (90, 91, 92) cooperating with the main fixing means (21) of the central column (20) and a secondary element (70) of the towing ring type (70) cooperating with the secondary fixing means (42) of the first lateral column (4L) for fixing the rear support (80) relative to the arrangement (2).

9. Vehicle (1) according to the preceding claim, characterized in that the rear support (80) comprises a means for locking in position (86, 87, 88, 89) the rear support (80) relative to the secondary element (70), in particular relative to a U (71) of the secondary element (70).

10. A method of assembling a vehicle (1) capable of supporting a rear load, in particular a load comprising at least one bicycle, comprising: - a step of providing an arrangement (2) according to one of claims 1 to 6 and providing a rear support (80), in particular a rear support (80) intended to support at least one bicycle, the rear support (80) comprising a main element (90, 91, 92) and a secondary element (70), - followed by a step of fixing the rear support (80) relative to the arrangement (2) by cooperation of the main element (90, 91, 92) of the rear support (80) with the main fixing means (21) of the central column (20), in particular by screwing, and by cooperation of the secondary element (70) of the rear support (80) with the secondary fixing means (42) of the first lateral column (4L), in particular by screwing.

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