ES2360679B1 - HORIZONTAL DISCHARGE SYSTEM FOR SEMIRREMOLKS OR OTHER VEHICLES? TRANSPORTATION ASSETS. - Google Patents

Abstract

A system is described to simplify and expedite the unloading operations of the goods transported in a semi-trailer, in a conventional container or in a conveyor of another type. The system includes providing the body or warehouse in which the goods are loaded and transported, with a hydraulically hinged door or hatch by upward pivoting at the discharge end, and incorporating a means of movement and movement of the goods in relation to the space inside of the body. This means of movement of the goods towards the discharge end consists of a means of drag such as a belt, a set formed by plates and chains, either directly related to the bottom of the semi-trailer itself passing above and below the floor of the same, or with the formation of a bed associated with said floor with the incorporation of damping diapresses fed hydraulically or with the help of a multiplicity of intermediate support rollers. In the case of conventional containers or of the tanks associated with the tractor vehicles themselves, the dragging means are located entirely inside the cargo space of the goods above the ground.

Description

Horizontal unloading system for semi-trailers or other transport vehicles. Object of the invention

The present invention refers to a horizontal unloading system for semi-trailers or other transport vehicles, which provides essential novelty characteristics and notable advantages over the known and used means for the same purposes in the current state of the art.

More particularly, the invention proposes the development: of a system that installed along a conveyor device, such as a semi-trailer, a tractor vehicle (truck or similar), a public works machine, a metal container or other devices with Similar applications, allows the unloading of materials and goods transported can be carried out with absolute comfort and speed, by the rear of the trailer or container device. For this purpose, the invention has provided means of movement of the goods and materials along the device used for transport, to the rear discharge position, and the incorporation of a hatch at the rear end, capable of pivoting with respect to points top anchor, hydraulically operated.

The field of application of the invention is obviously included within the industrial sector dedicated to the manufacture of conveyors in general for various goods and materials. Background and Summary of the Invention

It is known by all in general the need to transport goods of various kinds between distal points, often separated by considerable distances. For this, it is known in the current state of the art the use of specially designed conveyor means according to the different practical use needs, and depending on the goods to be transported. Considering the specific case of a specific application example, such as the transport of materials for public works, produced or manufactured in a place that is normally away from the place of use, these materials are usually transported with the help of semi-trailers dragged by a tractor vehicle that moves them to the place where the unloading should take place. When the point of unloading is reached, the lowering of the materials received from the conveyor means can be carried out with the help of other devices and auxiliary means, such as forklifts, stackers,

or the pallet trucks, depending on the form of packaging in which these materials are served, or sometimes it happens that in the case of bulk materials, these are unloaded directly from the semi-trailer or medium that has transported them, causing from the tractor vehicle the inclination of the latter for the fall of the merchandise by gravity.

As will be understood, the use of all these additional elements to be able to carry out the unloading of the goods received in means of transport of the type of semi-trailers, containers or other conventional transporters, requires first of all to have the appropriate auxiliary device that allows To carry out the unloading operation, it requires the collaboration of a person knowledgeable about the handling of this auxiliary device, and also needs to be dedicated a considerable amount of time.

Taking into account the difficulties associated with the unloading of conveyor devices of the type mentioned, the present invention has as its main objective the creation of a new system that allows simplifying all the operations related to the unloading of materials and goods, especially when it deals with materials transported with semi-trailers, trucks or public works machinery of any kind, or even with containers of the type transported with a tractor vehicle. This objective has been fully achieved by means of the system that will be the object of detailed description in the following, whose main characteristics are included in the characterizing portion of the attached claim 1.

In essence, the system proposed by the invention is structured based on the integration in the semi-trailer, vehicle or container, of means of longitudinal displacement of the merchandise, designed so that the materials to be unloaded are taken to the rear of the transport device, that is, the discharge end, the rear part of which is closed by means of a pivoting gate or door with respect to anchoring means associated with the upper part thereof, and whose pivoting action is driven by hydraulic means of conventional type.

In a preferred embodiment, the means provided by the system for the movement of the transported materials towards the rear of the conveyor device, for example the rear end of a semi-trailer, where the unloading thereof is carried out, consists according to a preferred embodiment on a rubber band or the like extended according to the longitudinal direction of the latter, between rotors or rotating end brackets, of which at least one of the rotating supports constitutes a driving element driven by hydraulic pressure or the like supplied by the own vehicle

In an alternative embodiment, the means of movement of the goods is constituted by extended chains according to the longitudinal direction of the semi-trailer, geared with pinions in solidarity with the end rotors.

In another preferred embodiment, the floor of the semi-trailer is constituted by an independent "bed" formed by two plates between which a multiplicity of diapreses (pneumatic damping devices), arranged along the entire length of the semi-trailer are arranged. , fed by the vehicle's own pressurized air equipment, so that this form of construction allows the diapresses to cushion the blows of the merchandise.

As an alternative version to the previous embodiment, the "bed" of the floor of the semi-trailer can be formed by rollers that are responsible for supporting and moving the belt of movement of the materials along the length of the semi-trailer to the rear position of discharge.

In a different application case, with specific reference to the case of a conventional container, the unloading system of the invention is perfectly applicable and can be incorporated therein, providing said container with one of its ends.

a hinged hatch, for example hydraulically collapsible, and coupling an extended displacement belt between end rollers on the conveyor floor.

The same embodiments described above in relation to semi-trailers, are perfectly applicable in the case of tractor vehicles, especially those for the transport of materials for public works, whose rear boxes are capable of incorporating any of the proposed solutions (rubber belts , chain belt, independent bed with cushions and independent bed supported by rollers).

Similarly, the invention is also suitable for incorporation into the vats of work vehicles, in any of its embodiments.

In general, it will be understood that the different versions of the unloading system mentioned above are perfectly capable of allowing the unloading of goods from a semi-trailer, a container, or a tractor vehicle of any type intended for transport operations , can be carried out directly, in a short space of time, and without having to mount in the semi-trailer, container or vehicle in question other additional elements of movement of goods, thereby simplifying all related operations with the download and considerably shortening the time needed for such operations. Brief description of the drawings

These and other features and advantages of the invention will become more clearly apparent from the following detailed description of a preferred embodiment thereof, given only by way of illustration and not limitation, with reference to the accompanying drawings , in which:

Figures 1 to 4 show schematic views, in side elevation, of examples of semi-trailers in which, respectively, the different alternative versions of the unloading system proposed by the invention have been incorporated;

Figure 5 illustrates a schematic side elevation view of an example of a container provided with a discharge system according to the invention;

Figures 6a8 show schematic views of a tractor vehicle in whose rear box the different versions of the unloading system are installed, namely, rubber belt or chains, independent bed with damping diapreses, and independent bed supported by rollers, respectively, and

Finally, Figures 9a11 illustrate solutions similar to those represented in Figures 6 to 8, but implemented with the concrete use of a construction vehicle. Description of a preferred embodiment

As mentioned above, the detailed description of the download system of the invention will be carried out in the following with the help of the attached drawings, through which the same numerical references are used to designate the same or equivalent parts. Thus, taking into account first the representations shown in Figures 1 to 4, it is possible to see schematic views of many other examples of the realization of a semi-trailer in which the system of the invention has been implemented according to different alternative versions. Figure 1 shows a semi-trailer indicated in general with numerical reference 1, of the type comprising a storage body for the reception of the goods to be transported, mounted on a platform equipped with wheels R for displacement, and means of Hitch on the front of the platform for attachment to a tractor vehicle. The semitrailer 1 incorporates, in relation to its rear end, a door 2 or folding hatch by tilting with respect to articulation points 3 related to the upper part of said door, so that the upward tilt of the door or hatch leaves the passage a through the corresponding end of the semi-trailer 1 so that the goods transported therewith can be comfortably unloaded, without any difficulty, through said open end. The base or floor of the platform has grooves made according to the transverse direction, through which a belt 4 that extends over the entire length of the deposit body can pass, this belt being supported by at least one pair of rollers located in extreme positions, so that the belt runs firstly above the surface of the floor, and then, through the mentioned grooves (not visible in the Figure), is coupled to the rollers 5 to run below the soil surface, for all intents and purposes an endless belt. At least one of the rotating rollers is a driving roller and is hydraulically driven to move rotationally and thereby drag to said belt 4 so that the section of belt located above the floor surface of the semi-trailer body 1 moves towards the end of exit of the tank, as indicated by the arrow “F”, that is, towards the open end of the semi-trailer before lifting the door 2 by pivoting with respect to the anchors

3.

As will be understood, with a form of construction like the one mentioned above, it is enough to place the goods on the moving belt 4, so that they are dragged by it and removed from the inside of the tank by the rear end without any obstacle. Once the discharge is complete, the door 2 can be pivoted downwards, to return it to its resting position and thereby close the rear end of the body 1.

Referring now to Figure 2 of the drawings, an embodiment equivalent to that shown in Figure 1 can be seen, but which, unlike the latter, the belt 4 has been replaced by an assembly formed by plates and chains 6 which engage in pinions in solidarity with the rollers 5, and which extends in the same manner as in the previous version. Thus, when it is necessary to carry out operations of unloading of heavier merchandise or in which a safe displacement and without any relative landslides must be guaranteed, as indicated by the “F” arrow, the alternative version shown in this Figure 2 is especially interesting For such applications.

If the representation of Figure 3 is observed, an example of embodiment can be seen which, from a general point of view, corresponds to the same constructive philosophy of the examples described in relation to the previous Figures, but in which means of incorporation have been incorporated. intended damping

to absorb the blows that may be caused as a result of the goods transported. For this, the floor of the semi-trailer 1 has been conceived as an independent bed, formed by two plates 7, parallel, superimposed and separated by a certain predetermined distance, between which a space that allows the location of a multiplicity of diapresses is defined 8 tires fed by the vehicle's own pressurized air system, so that the means of movement of the merchandise, constituted for example by a set of plates and chains 6 similar to that of Figure 2, is extended by wrapping said bed of ground both above said bed 7, inside the tank 1, and outside the tank, below the floor thereof, between the associated roller and pinion groups 5. These diapreses constitute damping means while handling the goods, for example when they are discharged towards the rear end of the tank 1 as indicated by the direction of the "F" arrow, absorbing the energy of sudden movements and blows.

Finally referring to the case considered of a semi-trailer, the representation of Figure 4 illustrates a new alternative embodiment similar to those discussed in relation to the previous Figures, but which unlike them has been provided with a support base for the goods drag belt 4 in the direction of the "F" arrow obtained from a multiplicity of rollers 9 successively located one after the other in a transverse position to the tank 1, parallel to each other and consecutively separated by predetermined distances. This embodiment allows to ensure the dragging of heavier loads under optimal conditions of safety and efficiency.

As stated at the beginning of the description, the driving elements of any of the versions described are preferably driven by the hydraulic means of the tractor vehicle itself. Other conventional forms of movement generation would also be applicable, so the solution proposed by the invention should not be understood as limiting, but only as illustrative.

But the invention, as mentioned at the beginning of the description, is not only applicable to the case of semi-trailers, but, equivalently, can also be implemented in relation to conventional containers in their different types and sizes. An example of embodiment is shown in Figure 5, in which a container 1 'has been provided at its discharge end with a door

or hatch 2 folding upwards by the action of hydraulic rotors, by pivoting with respect to anchor points 3 associated with its upper end, so that in the elevated door condition, the end of the container is free, expedited for the unloading operation . The container 1 'includes a rubber or chain belt 4', which is located inside the container above the base or floor thereof, extended between rollers 5 ', of which at least one roller consists of a hydraulically driven drive roller in order to advance the belt 4 'in the direction of the "F" arrow during the unloading operations, in order to advance the goods placed thereon towards the rear end of the tank 1. Of that Thus, the design of the invention can be applied directly inside a container, also simplifying and expediting in this case the operations associated with the unloading of the goods transported inside the container.

But the solutions proposed by the invention are not limited to the cases considered illustratively in relation to Figures 1 to 5, but quite the contrary, they are versatile solutions that can be applied to any type of transport medium that can be used for the movement and movement of materials and merchandise between two remote points. Figures 6 to 9 illustrate examples of a tractor vehicle, such as a truck, containing the system of the invention, while Figures 9 to 11 illustrate representations comparable to the latter, but applied to the case of a typical public works machine.

Referring first to the case of a truck-type vehicle, self-propelled and therefore capable of moving on its own, indicated in general with the numerical reference 10, shown schematically in Figures 6 to 8, it can be seen that this vehicle incorporates a rear box 12 prepared to receive inside the goods to be transported, whose box is closed by a door or rear hatch 2 'hydraulically pivoting with respect to the lateral anchors incorporated in relation to both sides of its upper edge, so that the lifting the door 2 'leaves the rear end of the box 12 expedited for access to the materials and goods transported inside it. In the case of this type of vehicle, the system is mounted in the interior space of the box 12, above the floor of the box, and admits any of the versions already explained above, namely a tape or chain solution 4 "with pinions, driven in the direction indicated by the arrow" F "for the movement of the goods towards the discharge end by the driving action of rollers 5 'ends constituting hydraulic rotors (see Figure 6); a solution provided by the installation of an independent bed obtained by means of plates 7 'between which pneumatic diapresses 8 are disposed for the damping of blows and with the collaboration of a band 6' formed by plates or chains that when moving in the direction of the "F", driven by hydraulic rotors 5 ', drags the goods towards the exit end (see Figure 7), or an alternative solution in which the towing vehicle 10 includes a rear box in which the system can be implemented in a way that the floor of the vehicle constitutes an independent bed obtained by means of a multiplicity of rollers 9 arranged transversely, parallel and successively equidistant, constituting a support base and support for a band 4 "of the type of a tape or chain, dragged in the “F” direction of discharge by means of 5 'rotors, extreme hydraulics (see Figure 8).

In a completely equivalent way, the discussion previously made with respect to Figures 6 to 8, can be extrapolated to Figures 9 to 11, respectively, with the proviso that in this case it is considered a vehicle, typical in the construction of a construction site. public, consisting of a tractor unit that draws a tank 13 located on the platform of the tractor vehicle itself. Figures 9, 10 and 11 illustrate the system of the invention mounted inte

rim of the tank 13, above the floor thereof, intended for the dragging of the materials or merchandise to the rear discharge end as indicated in each case by an "F" arrow, and materialized according to embodiments in which the system is implemented by providing a means 4 "(Figure 9) formed by a belt or a chain driven from 5 'extreme hydraulic rotors; an independent bed formed by plates 7 'between which there are diapses 8 pneumatic dampers and complemented with a belt or chain 6' driven by extreme hydraulic 5 'rotors (Figure 10), or an independent bed obtained by a multiplicity of transverse rollers 9 , parallel and successively equidistant from each other, which constitutes a support and support base for a 4 ”drive belt consisting of belt or chain and driven by rotors 5 'hydraulic ends (Figure 11).

As will be understood, the consideration of the different alternative versions that has been contemplated in the foregoing, is only illustrative and is intended to explain examples in which the system of the invention is perfectly applicable, without claiming that the explanation is exhaustive, given that as those skilled in the art will understand, the system can be applied to any type of transport vehicle even though it has not been expressly cited throughout the description.

On the other hand, a very important advantage derived from the system of the invention can also be seen, and which consists in the total and complete elimination of any need for a tilting box or conveyor tank, as in many cases of the current technique, eliminating with this constructive difficulties, and simplifying and considerably reducing costs and production times.

It is not considered necessary to make the content of the present description more extensive so that a person skilled in the art can understand its scope and the advantages derived therefrom, as well as carry out the practical realization of its object.

Notwithstanding the foregoing, and since the description made corresponds only to a preferred embodiment, it will be understood that within its essentiality they may introduce multiple modifications and variations of detail, also included within the scope of the invention, and that in particular they may affect features such as shape, size or manufacturing materials, or any others that do not alter the invention as described and as defined in the following claims.

9 10

Claims (8)

1. Horizontal unloading system for semi-trailers or other transport vehicles, especially intended to be installed both in semi-trailers of the type that are towed by a tractor vehicle and in conventional containers used for the transport of goods and even in warehouses, boxes or vats of the tractor vehicles themselves, in order to facilitate and expedite the unloading operation by moving the goods towards the rear discharge end of such a transporting device, characterized in that the system comprises: a towed device such as a semi-trailer ( 1) or a container (1 '), or a tractor vehicle such as a truck (10) provided with a box

(12)

rear or a machine (11) provided with a tank (13), equipped with a door (2, 2 ') or hatch that closes the discharge end, whose door or hatch hinged by hydraulic actuation by virtue of an upward pivot with respect to anchoring means (3) associated with its upper end or edge, and a system for dragging and moving goods along the interior space of the body or deposit containing them in the direction of the discharge end, extended along the length total body

or deposit containing the goods, this dragging system being extended between rollers (5, 5 ’) ends of which at least one of said rollers (5, 5’) consists of a hydraulically driven driving roller or rotor.

2.

System according to claim 1, characterized in that said merchandise drag system along the inside of the body or tank of a semi-trailer (1) consists of an endless belt (4) that runs firstly over the surface of the floor of the semi-trailer and after passing through transverse openings made in the floor of the semi-trailer and coupled to said end rollers (5), it runs outside the semi-trailer, below the floor of the latter, thereby completing the endless travel .

3.

System according to claim 1, characterized in that said merchandise drag system along the length of the body or tank of the semi-trailer (1) in the direction of the discharge end, extended between the end rollers (5), consists of a set (6) formed by plates and chains geared in sprockets in solidarity with regard to rotation with said rollers (5).

Four.

System according to claim 1, characterized in that said merchandise drag system along the length of the body or deposit

of the semi-trailer (1) in the direction towards the discharge end, extended between the rollers (5) ends, includes the formation of an independent bed on the floor of said semi-trailer, constituted by two plates (7) superimposed, parallel and separated by a distance such that it results in the formation of a space in which a multiplicity of diapresses (8) is installed which, as pneumatic damping means, allow the energy of the shocks caused by the goods to be absorbed, the assembly being complemented with a tape or chain (6) for the movement of the goods towards the discharge end.

5.

System according to claim 1, characterized in that the drag of the goods along the body or tank of the semi-trailer (1) in the direction of the discharge end, is carried out with the help of a system consisting of a belt (4) extended between rollers (5) ends and positioned on a bed extended along the floor and obtained from a plurality of intermediate, transverse, parallel and successively separated rollers (9) separated by a predetermined distance.

6.

System according to claim 1, characterized in that in its version applicable to the case of a container (1 ') of goods, the drag system is located inside the body or deposit of said container, and consists of a belt or chains (4 ') endless extended along the length of the container, above the floor of the latter and between end rollers (5'), of which at least one of said rollers (5 ') is a driving roller and is hydraulically driven.

7.

System according to claim 1, characterized in that in the alternative version adapted for mounting on a tractor vehicle, such as a truck (10), a public works machine (11) or any other vehicle, the system is mounted in the interior space of the box (12) or tank (13) of deposit of the goods, above the floor of the latter, and is implemented by means of a belt or chain (4 ”), an independent bed formed by parallel and distanced plates (7 ') with the incorporation of diapreses

(8) shock absorber tires between them with the collaboration of a belt or chain (6 '), or independent bed obtained by means of a multiplicity of parallel transverse rollers (9) and successively equidistant along with a belt or chain (4 ”) for dragging of the goods in the direction of the rear end of the exit, the drag elements being in all cases animated by means of rollers (5 ') ends constituting hydraulically driven rotors, preferably from the tractor vehicle itself. SPANISH OFFICE OF THE PATENTS AND BRAND Application no .: 200802337 SPAIN Date of submission of the application: 05.08.2008 Priority Date: REPORT ON THE STATE OF THE TECHNIQUE 51 Int. Cl.: B60P1 / 38 (2006.01) RELEVANT DOCUMENTS

Category

Documents cited Claims Affected

X

US 3482717 A (MOSER WILLIAM HENRY) 09.12.1969, the whole document. 1.2

X

FR 2482531 A1 (LEGRAS PERE FILS SA) 20.11.1981, the whole document. 1.3

X

EN 2026814 A6 (PIQUE BELTRA ANTONIO et al.) 01.05.1992, the whole document. 1.5

X

JP 6127299 A (MAEKAWA MASAAKI) 10.05.1994, figures & Database Summary 1-3.5-7

EPODOC Recovered from EPOQUE; Accession number JP-6127299-A.

X

EN 409268 A1 (PIQUE POMA ANTONIO et al.) 01.01.1976, the whole document. 1,5,7

X

GB 2152895 A (HYDRAROLL LTD) 14.08.1985, the whole document. one

TO

2,4,6,7

TO

US 6837668 B1 (BROWN DAVID JOHN BOWES) 04.01.2005, the whole document. one

TO

WO 9211905 A1 (STAIRMASTER EXERCISE SYSTEMS) 23.07.1992, page 4, 2,4,7

line 10 - page 5, line 30; Figure 1.

Category of the documents cited X: of particular relevance Y: of particular relevance combined with other / s of the same category A: reflects the state of the art O: refers to unwritten disclosure P: published between the priority date and the date of priority submission of the application E: previous document, but published after the date of submission of the application

This report has been prepared • for all claims • for claims no:

Date of realization of the report 05.20.2011

Examiner D. Hermida Cibeira Page 1/4

REPORT OF THE STATE OF THE TECHNIQUE Application number: 200802337 Minimum documentation searched (classification system followed by classification symbols) B60P Electronic databases consulted during the search (name of the database and, if possible, terms of search used) INVENES, EPODOC, WPI State of the Art Report Page 2/4  WRITTEN OPINION Application number: 200802337 Date of Completion of Written Opinion: 05.20.2011 Statement

Novelty (Art. 6.1 LP 11/1986)

Claims Claims 1-7 IF NOT

Inventive activity (Art. 8.1 LP11 / 1986)

Claims 4 Claims 1-3.5-7 IF NOT

The application is considered to comply with the industrial application requirement. This requirement was evaluated during the formal and technical examination phase of the application (Article 31.2 Law 11/1986).  Opinion Base.- This opinion has been made on the basis of the patent application as published. State of the Art Report Page 3/4  WRITTEN OPINION Application number: 200802337 1. Documents considered.- The documents belonging to the state of the art taken into consideration for the realization of this opinion are listed below.

Document

Publication or Identification Number publication date

D01

US 3482717 A (MOSER WILLIAM HENRY) 09.12.1969

D02

FR 2482531 A1 (LEGRAS PERE FILS SA) 11/20/1981

D03

ES 2026814 A6 (PIQUE BELTRA ANTONIO et al.) 01.05.1992

D04

JP 6127299 A (MAEKAWA MASAAKI) 10.05.1994

D05

GB 2152895 A (HYDRAROLL LTD) 14.08.1985

D06

US 6837668 B1 (BROWN DAVID JOHN BOWES) 04.01.2005

D07

WO 9211905 A1 (STAIRMASTER EXERCISE SYSTEMS) 23.07.1992

2. Statement motivated according to articles 29.6 and 29.7 of the Regulations for the execution of Law 11/1986, of March 20, on Patents on novelty and inventive activity; quotes and explanations in support of this statement The present invention relates to a horizontal unloading system for semi-trailers or other transport vehicles. Document D01 is considered to be the closest in the state of the art to the object of claim 1. In said document, to which the following reference numerals belong, a semi-trailer (10) provided with a pivoting door (30) is disclosed. with respect to anchoring means (70, 72) associated with the upper edge of the side walls (24, 26) of the box (16) at its discharge end and of a system for dragging and shifting the load consisting of a belt without end (32) extended between end rollers (36, 38) driven by hydraulic motors (86, 118). Said endless belt (32) runs longitudinally on the floor (28) of the semi-trailer (10) and below said floor (28), through it through transverse openings (see figures 1, 2, 5). It is noted that the door (30) of the invention of document D01 is not associated with a hydraulic drive. Due to this difference found, claim 1 and, therefore, its dependent claims 2-7 are considered new (Art. 6, LP 11/1986). However, it is considered that a person skilled in the art starting from document D01 would find it possible to move said door (30) by means of a hydraulic drive, since it is common in the state of the art (see document D06, for example). Accordingly, it is estimated that claim 1 and also its dependent claim 2 lack inventive activity (Art. 8, LP 11/1986). In the following paragraphs, the technical characteristic present in claim 1 and related to the presence of a hydraulically operated pivot door will be obviated, since it is considered that said technical characteristic is common in the state of the art and would not provide inventive activity to the claims dealt with. In document D02, to which the following numerical references belong, a semi-trailer is disclosed with a load drag system based on a set consisting of bars (11) and chains (4) geared in pinions (18) integral with rollers (6, 7) ends moved by hydraulic motors (8). It is estimated that the invention disclosed in document D02 annuls the inventive activity of claims 1 and 3 (Art. 8, LP 11/1986). In document D03, to which the following numerical references belong, a semi-trailer is described with a load drag system based on an assembly formed by an endless belt (1) extended between end rollers (3, 3a) driven by motors hydraulic (5, 5a) and positioned on a bed obtained from a plurality of intermediate rollers (see single figure). It is estimated that the invention disclosed in document D03 annuls the inventive activity of claims 1 and 5 (Art. 8, LP 11/1986). In document D04, to which the following numerical references belong, a modular loading system based on a set (21) comprising an endless belt (5a) extended between end rollers is disclosed (see figures 14-16). (10) driven by a hydraulic motor (11). Said modular system could perfectly be located inside a container or inside the box of a truck, on its floor. It is estimated that the invention disclosed in document D04 annuls the inventive activity of claims 1, 6 and 7 (Art. 8, LP 11/1986). With respect to the inventive activity of claim 4, in document D05, to which the following reference numerals belong, a cargo haul system for semi-trailers based on a set formed by a plurality of endless belts (3) is disclosed. extended between end rollers (11) moved by a hydraulic motor (15). Said endless belts (3) are mounted on longitudinal profiles (5) supported by inflatable devices (8) capable of lifting said profiles (5) on a corrugated base (2) attached to the ground (19) of the semi-trailer during the drag of the load. There is a certain resemblance between the invention disclosed in document D05 and the object of claim 4, but even so, it is estimated that said invention does not nullify the inventive activity of said claim (Art. 8, LP 11/1986). On the other hand, in document D07, to which the following numerical references belong, a gymnastics apparatus for running is described based on an assembly formed by an endless belt (10) extended between end rollers (11a, 11b) moved by a motor (16), said endless belt (10) being supported by an iron (12), which in turn is supported on a chassis (19) thanks to pneumatic springs (25), capable of absorbing the impact of footprints of the runners. There is great similarity between the technical solution disclosed in document D07 and the object of claim 4, but it is not contemplated that an expert in the field could obviously combine some of documents D01-D05 with document D07 , mainly because this document belongs to a very different technical field. Therefore, it is still considered that claim 4 does have inventive activity (Art. 8, LP 11/1986). State of the Art Report Page 4/4