ITCO20130012A1 - CASE LOADING / UNLOADING SYSTEM OR BASES FOR GOODS TRANSPORT AND RUBBER VEHICLE - Google Patents

Description

â € œSYSTEM FOR LOADING / UNLOADING CASES OR BASES FOR THE TRANSPORT OF GOODS AND WHEELED VEHICLESâ €

FIELD OF INVENTION

The present invention relates to a system for loading / unloading crates or bases for goods transport and a wheeled vehicle.

STATE OF THE TECHNIQUE

As is known, goods can travel on wheeled vehicles, trains, ships and planes. There is a general tendency to restrict road transport.

For this reason, in the case of "intermodal transport", there is the need, for example, to transfer goods from trains to wheeled vehicles and from wheeled vehicles to trains.

Currently, this problem is solved by means of the so-called â € œcassembliesâ €, that is large containers that can be easily transported on the chassis of wheeled vehicles and on the platforms of railway freight wagons or easily placed on the ground of a storage area.

However, the current “swap bodies” are of considerable size and therefore can only be loaded on wheeled vehicles of considerable size.

These large crates contain large quantities of goods and therefore may involve sorting their contents and are not always suitable for delivery to the final recipient.

Such large vehicles may have difficulty traveling on narrow roads.

Therefore, in order to favor rail transport, better solutions are needed than those currently in existence.

SUMMARY

The idea behind the present invention is to use a transport element of small dimensions, that is, having a base of much smaller dimensions than those of the â € œcasksâ € or the â € œISO containersâ €. This element can be a crate (ie an element similar to a box) or a support base (ie an element similar to a tray).

More precisely, it was decided to choose a first dimension of the base of the element corresponding to approximately the width of a `` swap body '' (which is typically about 250 cm) and a second dimension of the base of the corresponding element about one submultiple (for example one third) of the length of an â € œISO containerâ €; as will be explained in the detailed description, the second dimension is preferably a little smaller than a submultiple of the length of an "ISO container".

According to a specific realization, the dimensions of the base of the transport element are respectively 250 cm and 185 cm.

To facilitate the transport of such a small transport element, it was decided to position it on a wheeled vehicle in such a way that the overall dimensions in the transverse direction are less than the overall dimensions in the longitudinal direction.

To achieve this result, it was decided to equip the wheeled vehicle with a loading / unloading system that is able, during the loading phase, to take the element for example from the freight wagon of the train and rotate it (typically of 90 °), and, during unloading, to rotate the element and put it on the freight wagon of the train. According to the preferred embodiment above, thanks to the rotation, the width of the wheeled vehicle can be as low as 185 cm (or slightly more) - without the rotation the width of the wheeled vehicle should have been 250 cm (or slightly more), therefore much greater.

The present invention is defined by the claims appended hereto.

According to a first main aspect, the present invention relates to a system for loading / unloading crates or bases for transporting goods.

According to a second main aspect, the present invention relates to a wheeled vehicle which comprises such a loading / unloading system.

In general, the system for loading / unloading crates or bases for goods transport is suitable for being mounted on a wheeled vehicle, and includes:

- a first fixed frame adapted to be stably mounted on the wheeled vehicle (it could also be integrated into the vehicle frame),

- a second frame that is movable and mounted on said first frame by means of rotation means adapted to allow the rotation of said second frame with respect to said first frame, and

- a translation unit mounted on said second frame by means suitable for allowing the translation of said unit with respect to said second frame;

in which said translation unit is adapted to support a crate or base for freight transport.

Said translation unit can advantageously comprise:

- a third frame movable and mounted on said second frame by means of first translation means adapted to allow the translation of said third frame with respect to said second frame, and

- a fourth frame which is movable and arranged on said third frame and equipped with second translation means adapted to allow the translation of said fourth frame with respect to said third frame;

in which said fourth frame is adapted to support a crate or base for transporting goods. The stroke of said third frame can be between 10 cm and 100 cm, preferably between 40 cm and 60 cm.

The stroke of said fourth frame can be between 240 cm and 260 cm, preferably about 250 cm.

Said fourth frame is preferably a carriage equipped with at least three runners, more preferably with at least four runners; these skates are typically roller skates; all or part of these wheels can be linked together by tracks.

Said carriage is typically adapted to translate at least in part out of said third frame.

Said fourth frame is typically adapted to rise vertically to raise / lower a crate or base for goods transport.

The vertical stroke of said fourth frame can be between 5 cm and 20 cm, preferably between 10 cm and 15 cm.

Said third frame can be adapted to hook onto a platform, in particular a platform of a vehicle or a platform placed on a vehicle.

The system according to the present invention advantageously comprises locking means suitable for locking a box or base when loaded on the wheeled vehicle. Said locking means can be associated with said second frame and / or said third frame and / or said fourth frame.

Said rotation means can allow rotations at least up to about 90 °, preferably rotations at least up to about 90 ° in two different directions of rotation, more preferably rotations of any angle in any direction of rotation. The system according to the present invention can comprise fluid-dynamic actuators able to cause the movements of its parts, in particular all the movements of its parts.

The system according to the present invention can comprise a remote control adapted to remotely control the movements of its parts, in particular all the movements of its parts.

In general, the wheeled vehicle comprises a loading / unloading system as defined above; it is typically a small truck. The wheeled vehicle according to the present invention can comprise at least three (preferably four) support feet, preferably with movement carried out fluid dynamically; with â € œwheeled vehicleâ € means a vehicle equipped with wheels (typically at least four) to move on roads.

The wheeled vehicle according to the present invention can comprise at least three (preferably four) support feet (in particular with fluid-dynamically actuated movement) suitable for achieving vertical alignment between said loading / unloading system and a support system for crates or bases for transporting goods. .

According to a first further aspect, the present invention relates to a small box for transporting goods on a wheeled vehicle, train, ship, plane. At the lower face, said case typically has at least two (preferably four) seats for receiving at least two (preferably four) corresponding (preferably retractable) locking pins.

Alternatively, in correspondence with the lower face, said case can have at least two (preferably four) locking pins (preferably retractable).

In correspondence with the lower face, said box can have at least four feet having a lower end capable of coming into contact with the upper face of a platform.

According to a second further aspect, the present invention relates to a small-sized support base for transporting goods on a wheeled vehicle, train, ship, plane.

At the lower face, said base typically has at least two (preferably four) seats for receiving at least two (preferably four) corresponding (preferably retractable) locking pins.

Alternatively, in correspondence with the lower face, said base can have at least two (preferably four) locking pins (preferably retractable).

In correspondence with the lower face, said base can have at least four feet having a lower end capable of coming into contact with the upper face of a platform.

According to a third further aspect, the present invention relates to a platform for a railway wagon capable of supporting two or more boxes or bases for transporting goods.

The platform according to the present invention typically comprises at least two (preferably four) pins adapted to cooperate with at least two (preferably four) corresponding seats on the lower face of a case or base for transporting goods.

Said pins are preferably retractable.

The platform according to the present invention can comprise a lever mechanism of the manual type adapted to extract / retract at least one of said pins, preferably at least two of said pins.

Said lever mechanism advantageously comprises a manual locking device for said lever.

The platform according to the present invention typically comprises at least four feet having an upper end capable of coming into contact with the lower face of the case or base.

Instead of the pins, said platform can comprise at least two (preferably four) seats adapted to cooperate with at least two (preferably four) corresponding pins on the lower face of a case or base for goods transport. The platform according to the present invention can comprise at least two (preferably four) pillars for supporting a similar platform above. According to a further fourth aspect, the present invention relates to a railway wagon comprising a support platform as defined above. LIST OF FIGURES

The present invention will become clearer from the detailed description which follows to be considered together with the attached drawings in which:

Fig .1 schematically shows a three-dimensional view of an example of embodiment of the loading / unloading system according to the present invention mounted on a wheeled vehicle in a first operating position (without the body and with the system retracted and parallel to the vehicle),

Fig. 2 schematically shows the system of Fig .1 with a box placed above the system,

Fig. 3 schematically shows a three-dimensional view of an example of embodiment of the loading / unloading system according to the present invention mounted on a wheeled vehicle in a second operating position (without the body and with the system retracted and perpendicular to the vehicle),

Fig. 4 schematically shows the system of Fig. 3 with a box placed above the system,

Fig. 5 schematically shows an example of embodiment of the loading / unloading system according to the present invention exploded into its four fundamental components (i.e. the four frames),

Fig. 6 schematically shows, in greater detail, the trolley contained in Fig. 5 in two different operating conditions (on the right with wheels inside and on the left with wheels outside),

Fig. 7 schematically shows a sequence of views corresponding to an unloading operation of a box from a railway carriage,

Fig. 8 schematically shows an embodiment example of a base according to the present invention,

Fig. 9 schematically shows an example of embodiment of a platform according to the present invention,

Fig. 10 schematically shows a first detail of the platform of Fig. 9 according to two slightly different views (one with a protective casing and one without the casing), and

Fig. 11 schematically shows a second detail of the platform of Fig.9.

Both this description and these drawings are to be considered for illustrative purposes only and therefore not for limitation purposes.

DETAILED DESCRIPTION

As is readily understood, there are various ways of practicing the present invention. In the following, only one example of realization will be described in detail and some of the many possible variants will be highlighted here and there; naturally, the specific description of the exemplary embodiment is not limiting to the present invention which, on the other hand, is defined by the appended claims.

The system of figures 1 to 6 is used to typically load and unload crates for freight transport and / or bases for transporting small goods; the crate encloses the goods to be transported like a box while the base supports the goods to be transported like a tray; the small dimensions refer mainly to the width and length of the lower face of the case and the base.

In figures 1 to 4, the loading / unloading system is mounted on a small-sized V wheeled vehicle; in Fig. 5 its main components of the system indicated as a whole as A.

In Fig .1, the loading / unloading system according to the present invention is mounted on a wheeled vehicle V in a first operating position without a body and with the system retracted and parallel to the vehicle; vehicle V is flanked by a wagon W; on the platform of the wagon W there is a platform D according to the present invention; on the platform D there is a box C according to the present invention.

In Fig. 2, the body C is no longer on the carriage W (as in Fig .1), but is on the vehicle V. In Fig. 3, the loading / unloading system is rotated 90 ° with respect to the situation of Fig .1 and therefore the system is perpendicular both to the length of the vehicle V and to the length of the wagon W; cash box C is located on carriage W.

In Fig. 4, the body C is no longer on the carriage W (as in Fig. 3), but is on the vehicle V. With particular reference to Fig. 5 and Fig. 6, the system A includes:

- a first T1 frame,

- a second T2 frame,

- a third T3 chassis, e

- a fourth T4 frame;

the whole of the third frame T3 and of the fourth frame T4 substantially constitute a translation unit.

The first T1 frame is fixed and can be stably mounted on the wheeled vehicle; it could also be, in whole or in part, integrated into the chassis of the vehicle itself; in the present embodiment of the figures, the first frame T1 is substantially constituted by two metal bars.

The second frame T2 is movable and is mounted on the first frame T1 by means of rotation (in the present example of embodiment of the figures, these are four wheels mounted in particular at each end of the two bars of the first frame T1) designed to allow the rotation of the second frame T2 with respect to the first frame T1; in the present example of realization of the figures, the second frame T2 consists of a large metal ring that rests on the four wheels and two metal bars with a â € œC 'shaped section fixed on the ring; the two â € œCâ € € of the two bars look at each other.

The third frame T3 is mobile and is mounted on the second frame T2 by means of first translation means (in the present example of embodiment of the figures, it is a series of wheels) suitable for allowing the translation of the third frame T3 with respect to the second frame T2; in the present example of embodiment of the figures, the third frame T3 consists of two metal bars with a â € œZâ € shaped section fixed on the ring; on one of the extreme sections of the â € œZâ € of each bar, two sets of wheels are hinged in two different positions respectively; these wheels are located (when the system is assembled) inside the â € œCâ € shaped bars and allow the translation of the third frame T3 with respect to the second frame T2; it is therefore a translation solution of the telescopic type; the central section of the â € œZâ € of each bar is substantially horizontal (when the system is assembled).

The fourth frame T4 is mobile, it is arranged on the third frame T3 and is equipped with second translation means (in the present example of realization of the figures, these are four roller skates) suitable for allowing the translation of the fourth frame T4 compared to the third frame T3; in the present embodiment of the figures, the fourth frame T4 consists of two longitudinal metal bars connected by two transverse metal bars. The two longitudinal bars are used to support a box C or base B (when present). Each of the two longitudinal bars houses two roller skates P almost integrally; a first shoe is located in a first lower extreme zone of a longitudinal bar and a second shoe is located in a second lower extreme zone of the same longitudinal bar; in a first operating condition of the fourth frame T4 (on the right of Fig. 6), the wheels are almost integrally internal to the external profile of the longitudinal bars and, in a second operating condition of the fourth frame T4 (on the left of Fig. 6), the wheels are totally external to the external profile of the longitudinal bars and therefore are quite far from the bars. It is therefore understood that, according to the present example of embodiment of the figures, the fourth frame T4 is a trolley equipped with skids (in particular with wheels) adapted to translate on the third frame T3; the skates are advantageously provided with rollers (in particular two rollers); all or part of the wheels could also be bound together by tracks.

The whole of the third frame T3 and of the fourth frame T4 substantially constitute a translation unit which is able to support a body C or base B (when present).

As will be better understood in the following, the fourth T4 chassis is capable of translating at least partially out of the third T3 chassis; that is, in the present example of embodiment of the figures, the wheels of the trolley are able to roll not only on the third frame T3 (in particular the central section of the â € œZâ € of the bar) but at least partially outside.

The stroke of the third T3 frame can be included, for example, between 10 cm and 100 cm, preferably between 40 cm and 60 cm, that is, it is rather short; in this way, the overhang is limited; this translation serves only to approach the third frame T3 to a platform.

The stroke of the fourth T4 frame is included, for example, between 240 cm and 260 cm, preferably it is about 250 cm, that is, it is quite long since the fourth T4 frame has the task of taking and placing the box or base; the dimensioning of the length of the fourth T4 frame can be done, for example, by adding half the length of the third T3 frame and half the width of the platform where the box or base rests.

As can be understood, for example from Fig.6 as well as from Fig.7-3 and Fìg .7-4, the fourth frame T4 is able to rise vertically to raise / lower a crate or base for freight transport.

The vertical stroke of the fourth frame T4 can be included, for example, between 5 cm and 20 cm, preferably between 10 cm and 15 cm; this vertical stroke is relatively short as it must be sufficient to lift the box or base to avoid interference during translation, for example from the wagon to the vehicle or vice versa.

In the example of embodiment of the figures, the third frame T3 is suitable for hooking onto a platform, in particular a platform of a vehicle or a platform placed on a vehicle; the coupling takes place, for example, in the situation shown in Fig.7-3, ie when the third frame T3 has moved towards the floor; in this way, the fourth T4 chassis can move safely by moving from the third T3 chassis to the floor and vice versa.

Advantageously, the system according to the present invention can comprise locking means suitable for locking a box or base when loaded on the wheeled vehicle (these are not shown in Fig.5); these locking means can be associated with the second frame T2 and / or with the third frame T3 and / or with the fourth frame T4.

The rotation means of the system according to the example of embodiment of the figures allow rotations of the second frame T2 of any angle in any direction of rotation (see Fig.5); according to alternative and less advantageous embodiments, these rotations could be rotations at least up to about 90 ° in two different directions of rotation or rotations at least up to about 90 ° in a single direction of rotation.

The system according to the present invention can comprise actuators (not shown in the figures) able to cause movements of its parts, preferably all the movements of its parts; typically all actuators will be hydraulic because it is convenient in a truck, but it is also possible that some or all of these are pneumatic or electric for example. In the case of use of fluid dynamic actuators for the horizontal and vertical movements of the fourth T4 frame (including those of its roller skates), since this frame has a very long stroke, it is advantageous to provide a fluid dynamic circuit which is internal to the frame and which is connected to a fixed fluid dynamic system by means of flexible pipes; It should be noted that the fluid dynamic motors of the wheels are typically braked (and therefore blocked) when they are not rotating.

The system according to the present invention can comprise a remote control (not shown in the figures) adapted to remotely control the movements of its parts, preferably all the movements of its parts.

Figures 1 to 4 show a small wheeled vehicle.

In these figures, the vehicle is equipped with four support feet; per se, these support feet are known in the art and typically have fluid-dynamically actuated movement; these feet are generally called â € œstabilizersâ € precisely because they are used to ensure good stability to the vehicle when it has to perform operations other than movement on the road.

As can be understood from what has already been said, according to the present invention, the loading / unloading system must be aligned vertically and appropriately with a support system so that the transfer of the crates and / or bases can take place with uniform movements and therefore without risks of falls for crates, bases and goods.

It was therefore decided to carry out this vertical alignment using the support feet; however, it is necessary to use support feet (preferably fluid dynamic) that with a possibility of extension (and therefore adjustment of the vertical position of the vehicle and of the loading / unloading system) of at least 30-40 cm (or even more); usually, the support feet are used to lift the vehicle a little, 5-10 cm.

In figures 1 to 4, the support feet are in a very extended condition (obviously the vehicle tires do not touch the ground in the least).

In the following an operation of unloading a crate from a railway wagon (which in the case of the present invention is a â € œfreight wagonâ €) will be described with the aid of figures 7.

The vehicle equipped with a loading / unloading system according to the present invention is laterally flanked by a freight wagon on which a platform according to the present invention is placed; the vehicle is arranged, for example and preferably, in such a way that its longitudinal axis is substantially parallel to the longitudinal axis of the wagon; the vehicle is close enough to the wagon.

It is worth clarifying that a vehicle equipped with a loading / unloading system according to the present invention can also be arranged transversely with respect to the wagon, for example approaching it in reverse; however, in this case, not all the functions of the loading / unloading system are exploited, in particular the rotation functions are not exploited.

A box according to the present invention is blocked on the platform according to the present invention; in particular, four retractable pins of the platform are extracted and inserted into four corresponding seats on the lower face of the box (the seats correspond to the four lower edges of the box).

An operator takes a special remote control and controls the movements (of the vehicle support feet and the vehicle loading / unloading system) described below.

The four support feet of the vehicle extend until they rest on the ground and then raise the vehicle appropriately; the operator tries to make sure that the third frame of the vehicle system is horizontally aligned with the platform placed on the wagon.

The vehicle loading / unloading system is rotated by about 90 °; precisely, this rotation affects the second frame and the third frame and the fourth frame.

See Fig. 7-1.

The loading / unloading system is approached to the wagon; this approach involves the third frame and the fourth frame; precisely, the third frame moves in the direction of the wagon until it reaches the platform placed on the wagon; since the fourth frame is arranged above the third frame, the translation of the third frame causes a corresponding translation of the fourth frame.

See Fig. 7-2.

If the rotation of the loading / unloading system (in particular of the third frame) and the height of the vehicle (in particular of the loading / unloading system, more particularly of the third frame) are correct, the front side of the third frame is ̈ perfectly resting on a lateral side of the platform placed on the wagon; in this situation, these two elements are coupled together (such coupling means are advantageous even if not strictly indispensable). Otherwise, the operator can act on the remote control, lowering or raising the vehicle a little and / or rotating the system to one side or the other a little, until rotation and height are not sufficient. exact; after these adjustment operations, it may be necessary to bring the third frame closer to the floor.

Subsequently, the fourth frame is translated in the direction of the wagon; the wheels of his skates roll first on the third frame and then on the platform placed on the wagon; initially all four runners are on the third frame, then two runners are on the third frame and two runners on the floor, finally all four runners are on the floor.

See Fig .7-3.

The fourth frame is moved until it is exactly under the crate to be unloaded.

The fourth frame stops and rises vertically (thanks to suitable means) keeping the wheels resting on the platform; first the fourth frame is raised (for example by 6 or 7 cm) until it comes into contact with the lower face of the case, then the fourth frame is raised (for example by another 6 or 7 cm), also raising the case.

At this point, the fourth frame is moved back towards the vehicle, also transporting the body; initially all four runners are on the floor, then two runners are on the third frame and two runners on the floor, finally all four runners are on the third frame; It should be noted that the weight of the case is very well supported by the vehicle and the wagon.

See Fig. 7-4.

The fourth frame (with the case) is moved back until it is exactly on the third frame; here it stops and its wheels are held in check. See Fig. 7-5.

The third frame (with the fourth frame and with the case) is moved backwards (after a possible release from the floor) until it is centered on the second frame.

See Fig. 7-6.

The fourth frame is lowered vertically, keeping the braked wheels resting on the third frame; first the fourth frame is lowered (for example by 6 or 7 cm) and in this way lowers the box which locks thanks, for example, to suitable pins of the second frame, then the fourth frame is lowered (for example by another 6 or 7 cm) completely.

The second frame (with the third frame and with the fourth frame and with the case) is rotated back about 90 °.

See Fig. 7-7.

The four support feet of the vehicle are shortened completely; that is, they first lower the vehicle until its tires touch the ground and then return to the rest position.

At this point, the vehicle can move by transporting the unloaded crate to its destination.

It is clear that when a crate is on the vehicle and must be loaded on the wagon, the operations follow one another in an inverted order with respect to what was previously described.

In Fig. 8, an example of realization of a small support base B for freight transport on wheeled vehicle, train, ship, plane is shown. The dimensions of the base in Fig. 8 are 250 cm x 185 cm; of course, these values are not to be strictly considered.

At the lower face (not visible in Fig. 8), the base typically has four seats (not visible in Fig. 8) for receiving four corresponding (preferably retractable) locking pins; in this example, the seats correspond to the corners of the base.

Alternatively, in correspondence with the lower face, the base can have four (preferably retractable) locking pins.

In correspondence with the lower face, the base can have four feet having a lower end capable of coming into contact with the upper face of a platform; this is not the case in the example of Fig.8.

In Fig.8, the seats suitable for housing the longitudinal bars of a trolley of a loading system according to the present invention can be seen.

A structure similar to the one just described can be included in a case C according to the present invention; an example of an embodiment of this box is shown in figures 1 to 7.

In Fig.9, an example of realization of a platform D for a railway wagon is shown, able to support two or more boxes or bases for freight transport; such a platform is suitable for being placed, for example, on the platform of a railway wagon or on the platform of a large wheeled vehicle.

The dimensions of the platform in Fig. 9 are 606 cm x 250 cm; of course, these values are not to be strictly considered. On such a platform, for example, three bases like the one in Fig. 8 can be placed side by side (even if in Fig. 9, for clarity, only one is provided on the side); in the sense of the length, 606 - 3x185 = 50 cm will remain free, which are used (in this example of realization) for the pillars of the platform, which will be mentioned later.

The platform according to the present invention typically comprises four pins (see in particular Fig. 10) adapted to cooperate with four corresponding seats on the lower face of a box or base for transporting goods.

Said pins are preferably retractable pins (see in particular Fig. 10).

The platform according to the present invention can comprise a lever mechanism of the manual type adapted to extract / retract at least one of said pins (see in particular Fig.10), preferably at least two of said pins.

Said lever mechanism advantageously comprises a device for manual locking of said lever (see in particular Fig.10); in the example of Fig. 10, the pin retracts by pushing a knob and is extracted by pulling a knob and there is a plate that can rotate and which, in the position shown in Fig. 10, prevents a user from translating the knob .

The platform according to the present invention typically comprises at least four feet (see in particular Fig. 10-1) having an upper end capable of coming into contact with the lower face of the casing or base.

Instead of the pins, said platform can comprise four seats adapted to cooperate with four corresponding pins on the lower face of a case or base for goods transport.

In general, the platform according to the present invention comprises means suitable for locking the boxes or bases which are placed on it; these locking means can be manual or automatic; the manual locking means can also be very similar to those commonly used for â € œchange boxesâ € and â € œISO containersâ €.

The platform according to the present invention can comprise at least two (preferably four) pillars (see Fig.9) for the support of a similar platform above; the platforms.

Fig. 11 shows a detail of the platform of Fig. 9; it corresponds to a transmission which allows, by pulling a single knob, to extract both a pin on the right and a pin on the left of the platform at the same time.

It is worth clarifying that the loading / unloading system and the wheeled vehicle according to the present invention and as claimed herein can also be used with crates, bases and platforms for transporting goods other than those defined and described above.

Claims (11)

CLAIMS 1. System for loading / unloading crates or bases for freight transport, adapted to be mounted on a wheeled vehicle, comprising: - a first fixed frame adapted to be mounted stably on the wheeled vehicle, - a second frame which is movable and mounted on said first frame by means of rotation means adapted to allow the rotation of said second frame with respect to said first frame, and - a translation unit mounted on said second frame by means suitable for allowing the translation of said unit with respect to said second frame; in which said translation unit is adapted to support a crate or base for freight transport. System according to claim 1, wherein said translation assembly comprises: - a third frame movable and mounted on said second frame by means of first translation means adapted to allow the translation of said third frame with respect to said second frame, and - a fourth frame which is movable and arranged on said third frame and equipped with second translation means adapted to allow the translation of said fourth frame with respect to said third frame; in which said fourth frame is adapted to support a crate or base for transporting goods. System according to claim 2, wherein said fourth frame is a trolley equipped with at least three roller skates, preferably at least four roller skates. System according to claim 2 or 3, wherein said fourth frame is adapted to rise vertically to raise / lower a case or base for transporting goods. 5. System according to claim 2 or 3 or 4, wherein said third frame is adapted to be hooked to a floor, in particular a floor of a vehicle or a floor placed on a vehicle. System according to any one of the preceding claims, comprising locking means adapted to lock a box or base when loaded on the wheeled vehicle. 7. System according to any one of the preceding claims, in which said rotation means allow rotations of at least about 90 °, preferably of about 180 °. System according to any one of the preceding claims, comprising fluid dynamic actuators adapted to cause the movements of its parts. System according to any one of the preceding claims, comprising a remote control adapted to remotely control the movements of its parts. 10. Wheeled vehicle comprising a loading / unloading system according to any one of the preceding claims 1 to 9. 11. Wheeled vehicle according to claim 10, comprising at least three (preferably four) support feet suitable for achieving vertical alignment between said loading / unloading system and a system for supporting crates or bases for transporting goods.