Abstract:
A platform is described for use in a logistic system such as by being placed onto the loading surface of a vehicle in a conveying or haulage direction (A) and by being taken from the loading surface of a vehicle in the same direction. The platform has dimensions that are substantially adapted to the loading surface of the vehicle. The platform has at least one first platform element and one second platform element, which can be locked to each other and released from each other. The first platform element has a locking element and the second platform element has a locking receptacle provided facing the locking element in such a way that the locking receptacle of the second platform element can engage with the locking element of the first platform element.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a U.S. national phase application of PCT/EP2011/073125, filed Dec. 16, 2011, which claimed priority to German patent application DE 10 2010 063 310.0, filed Dec. 16, 2010. Each of these applications is incorporated by reference herein in its entirety. 
     TECHNICAL FIELD 
     The present invention relates to a platform for use in a logistics system. 
     BACKGROUND 
     In existing warehouses or order-picking units, there are a large number of docking stations, (also referred to as factory doors) to which the trucks can be advanced up, by way of their rear side in each case, in order to receive the goods. Such warehouses or order-picking units exist in large numbers and it is often possible for a multiplicity of vehicles to be advanced simultaneously up to the docking stations, which are respectively located one beside the other, in alignment with one another, in a building wall. It is thus possible for as many trucks to dock as there are docking stations, that is to say building-wall openings/factory doors. These docking stations are usually arranged level with the loading areas of the trucks, in order that the warehouse floor and the loading area of the truck form a single plane and the truck can be loaded and unloaded, for example, by fork stackers moving thereon. Since it is the case, with this kind of loading and unloading, that each fork stacker or other kind of transporting apparatus can transport only one goods pallet, or a small number of goods pallets, this kind of loading and unloading is very time-intensive. It is also the case that the truck which is to be loaded and unloaded cannot be moved away from the docking station throughout the duration of the loading and unloading operation. 
     EP 1 808 387 A2, which should be considered to be the closest prior art, discloses a logistics system in which the freight which is to be loaded and unloaded is stored on a goods platform, also referred to as a platform or load carrier, and the platform as a whole, together with the freight, is taken off the truck, or put onto the truck, in one operation. That is to say the platform as a whole, with the goods, can be transferred to a vehicle in a single step or can be received from a vehicle in a single step. 
     The invention is based on the object of further improving the platform of the aforementioned logistics system. 
     SUMMARY 
     This object is achieved according to the invention by a platform having the features described in further detail below. 
     Therefore, the invention provides a platform for use in a logistics system, in order to be transferred onto the loading area of a vehicle in a haulage direction and/or to be received from the loading area of a vehicle in a haulage direction. The platform essentially has dimensions which are adapted to the loading area of the vehicle. The platform has at least one first platform element and one second platform element, which can be locked to one another, but can also be released from one another. The first platform element has a locking element and the second platform element has a locking holder, provided opposite the locking element, such that the locking holder of the second platform element can latch into the locking element of the first platform element. 
     It is advantageous, in the case of the platform according to the invention, that the latter is of modular construction. It is thus possible for the individual platform elements to be assembled to form a platform and thus for the size of the platform to be adapted to different loading-area sizes or use purposes. Latching one platform element into another can establish a straightforward, quick and robust connection between the platform elements. This connection can also be released again. 
     It is further possible for an already loaded platform thus to be extended by further platform elements, since the latching-in action for joining the platform elements together does not require any interventions or mounting operations to be carried out on the first, loaded platform. 
     According to one aspect of the invention, the locking element of the first platform element and the locking holder of the second platform element are each provided on the underside of the platform element. In this arrangement, that surface of the platform on which the goods and articles can be provided is not adversely affected or obstructed by the locking elements. 
     According to a further aspect of the invention, the first platform element has a recess, in which a protrusion of the second platform element can engage by way of a pivoting movement about a horizontal axis perpendicularly to the haulage direction. This allows the second platform element to be latched into the first platform element, as is known, for example, from click laminate. The recess here serves both for positioning the second platform element in relation to the first platform element and for guiding the pivoting movement, and also as a further retaining means between the two platform elements in the locked state. 
     The present invention likewise relates to a platform for use in a logistics system, in order to be transferred onto the loading area of a vehicle in a haulage direction and/or to be received from the loading area of a vehicle in a haulage direction. The platform essentially has dimensions which are adapted to the loading area of the vehicle. The platform, on at least one lateral edge, has a roller which is provided such that it can be rotated about the vertical axis and is designed to protrude beyond the lateral dimensions of the platform. 
     The advantage with this platform according to the invention is that the lateral roller can provide lateral guidance and support, for example, in relation to a side wall of the loading area of a vehicle or the lateral boundary of a transfer station, provided for transferring the platform onto the loading area of a vehicle and/or for receiving the platform from the loading area of a vehicle. It is thus possible to improve the lateral guidance of the platform during the transfer and/or receiving operation, since the possibility of the platform jamming or tilting is reduced. 
     According to one aspect of the invention, at least one roller is provided at a corner of the platform. This makes it possible to ensure the lateral guidance of the platform throughout the movement operation, since the corners of the platform are first to come into contact with, for example, the lateral boundary of a transfer station. In particular at least one lateral roller at a corner of the platform can facilitate introduction, for example, into the transfer station since jamming or tilting is more likely to occur here than during the haulage movement. 
     The present invention likewise relates to a platform for use in a logistics system, in order to be transferred onto the loading area of a vehicle in a haulage direction and/or to be received from the loading area of a vehicle in a haulage direction. The platform essentially has dimensions which are adapted to the loading area of the vehicle. The platform has an engagement means, in which a haulage means can engage in order to pull the platform from the loading area of the vehicle in the haulage direction. 
     The advantage here is that the engagement means allow the platform to be moved downward and/or out, quickly and straightforwardly, from the loading area of a vehicle or also from a transfer station or a store or the like in which empty and/or loaded platforms can be stored. 
     According to one aspect of the invention, the platform has a compression spring, in order for the engagement means to be pushed out of the platform in the haulage direction. The engagement means can thus be moved into an engagement position, and therefore the haulage means can straightforwardly and reliably grip, and pull, the platform. 
     According to a further aspect of the invention, the platform is provided, and the compression spring is dimensioned, such that the engagement means can be pushed all the way into the platform and accommodated by the platform. It is thus possible for the engagement means, in the state in which it has been pushed out by the compression spring, to project out of the platform such that it can be gripped reliably, straightforwardly and quickly by a haulage means and, at the same time, can be pushed into the platform such that it does not project beyond the same, nor be damaged or cause an obstruction. It is thus possible, for example, for the platform, the compression spring and the engagement means to be provided, and dimensioned, such that the engagement means is pushed in by, for example, the loading ramp of the vehicle and thus does not project obstructively beyond the rear edge of the platform and hinder the closure of the loading-area wall or the swinging-up action of the loading ramp. It is further possible, when the loading area is being lowered, for the engagement means to be pushed out of the platform by the compression spring, so that with immediate effect, i.e. once the loading area has been opened or the loading ramp has been lowered, it is ready for use, in order to pull the platform downward from the loading area of the vehicle, without any additional intervention on the part of a user. 
     According to a further aspect of the invention, the platform has a plurality of rollers which are incorporated in roller casings, in order to be shifted on these rollers in the haulage direction. The rollers make it possible for the platform to be shifted. Incorporating the rollers in roller casings in the platform can give rise to a compact and flat construction. 
     According to one aspect of the invention, the platform, with rollers and roller casings, has an overall height of not more than 50 mm. This can give rise to a very flat and compact construction of the platform, which does not take up any more height than absolutely necessary on the loading area of a vehicle. 
     According to a further aspect of the invention, the platform consists essentially of aluminum. This allows the platform to be very lightweight, in order for it to be possible for the haulage operation to be carried out as straightforwardly as possible and with low driving and/or pulling forces on the part of the haulage means. This also means that the vehicle hauls the smallest possible amount of additional weight. 
     According to a further aspect of the invention, all common industrial trucks can be moved on the load carrier. This allows industrial trucks to load and unload the load carrier and/or assist in this operation. 
     According to a further aspect of the invention, a loaded platform ( 25   t ) can be moved on the platform. This means that a fully loaded load carrier ( 25   t ) can be pulled/rolled over an empty load carrier (sandwich principle). This allows a loaded load carrier (platform) to be hauled over an unloaded load carrier, in order for it to be possible for two load carriers to be exchanged for one another in a space saving manner on the loading area of a vehicle and/or in a holder of a transfer station. 
     The invention according to one of the above-described aspects and/or according to one of the above-described preferred embodiments is advantageously developed by the platform having a plurality of rollers which extend, at least in part, out of a loading surface of the platform. The rollers, which are arranged in this way on the upper side of the platform, facilitate the movement of loaded goods, for example of pallets or cartons, on the loading surface. It is thus possible for the load items simply to roll over the platform, or to be transported onto the same and/or downward from the same. This can be done preferably by means of a stacker, or particularly preferably by a tilting action, in other words an end surface of the platform being raised on one side. The resulting sloping position of the platform causes the load items to begin to shift along the rollers on the loading surface in the direction of the resulting gradient. 
     The rollers are preferably incorporated in each case individually or in groups in the roller casings or in separate roller casings. In particular in the case where the rollers for the upper side of the platform are arranged in the same roller casings as the rollers for the underside of the platform, it is possible for all the rollers to be exchanged simultaneously in only a small time frame. As an alternative to this, arranging the upper-side rollers in respectively separate roller casings proves to be advantageous to the extent that defective rollers can be exchanged individually without all the rollers, or a large number of rollers which are still intact, having to be exchanged. 
     The rollers are preferably arranged one beside the other in the longitudinal direction of the platform in two or more main rows, and further preferably in one or more secondary rows. The spacings between two adjacent rows (main and/or secondary row) on the loading surface of the platform are preferably each in the region of 400 mm or less. The spacing of 400 mm or less is particularly advantageous when it is taken into account that a length of 800 mm corresponds to the shorter edge length of a Europool pallet according to EN 13698-1, also referred to as a Euro pallet. In the case of a spacing equal to half or less of each edge length, Europool pallets arranged on the platform are thus always located one beside the other at least on two rollers, this ensuring stable transportation of the load items. The smaller the expected load for transportation, the smaller the spacing between two adjacent rows on the upper side of the platform—the loading surface—is preferably chosen to be. The spacing between the rows, in addition, can be adjusted preferably via the corresponding roller casings being rearranged. 
     In a further preferred embodiment, the roller casings, incorporated in the platform, on the at least one first platform element are arranged at a first spacing from one another, and those on the at least one second platform element are arranged at a second spacing, which differs from the first spacing. Further preferably, the platform has a multiplicity of first and second platform elements, which are arranged to alternate with one another and are locked to one another. This has the advantage, in particular in conjunction with the above-explained different spacings of the roller casings for the first platform element and the second platform element, that the platform—as seen in the longitudinal direction of the platform—is mounted, not on two rows of rollers, but rather on four rows of rollers, as a result of which the stability of the platform is significantly improved. 
     In yet a further preferred embodiment of the invention, the first and second platform elements are fixed relative to one another in the transverse direction of the platform, and are arranged preferably parallel to one another and in alignment in the longitudinal direction of the platform, by means of securing bolts, which are each arranged between two adjacent platform elements. Providing securing bolts, preferably located opposite one another along the periphery of the platform, on the underside and/or upper side thereof, facilitates the positioning of adjacent platform elements for more straightforward and quicker locking. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Exemplary embodiments and advantages of the invention will be explained in more detail hereinbelow with reference to figures which follow, in which: 
         FIG. 1  shows a plan view of a platform; 
         FIG. 2  shows the platform in a view from beneath; 
         FIG. 3  shows a perspective view of the platform from above; 
         FIG. 4  shows a further perspective view of the platform from above; 
         FIG. 5  shows, in the upper region, a side view of the platform and, in the lower region, two detail-form views of the left-hand and right-hand edge of the platform; 
         FIG. 6  shows a further detail-form view of the platform; 
         FIG. 7  shows a plan view of a platform according to a further exemplary embodiment of the invention; 
         FIG. 8  shows a detail-form view of the plan view from  FIG. 7 ; 
         FIG. 9  shows a three-dimensional illustration of a loaded platform according to  FIGS. 7 and 8 ; 
         FIG. 10  shows a simplified (lateral) detail-form view of the platform according to  FIGS. 7 to 9 ; and 
         FIG. 11  shows a view from beneath of the platform according to  FIGS. 7 to 10 . 
     
    
    
     DETAILED DESCRIPTION 
     Structurally and/or functionally similar or identical parts in the two exemplary embodiments shown are given identical designations. To this extent, reference is made in each case to what is said in respect of the respective exemplary embodiment. 
       FIG. 1  shows a plan view of a platform  10 . The platform  10  may also be referred to as a load carrier or goods platform  10 . The platform  10  is adapted essentially to the dimensions of the loading area of a vehicle, e.g. of a truck or trailer or semitrailer. It is thus possible, for example, for the platform  10  to have a length of 13.405 m in its longitudinal direction A and a width of 2.440 m in its transverse direction B. 
     The platform  10  is intended to reproduce the loading area of a vehicle. It is thus possible for the platform  10 , loaded with goods, to be used, e.g. within the context of a logistics system, for being shifted onto the loading area of a vehicle or moved downward from the loading area of the vehicle. This allows the operation of loading and unloading a vehicle with goods to be accelerated to a considerable extent, since there is no need for the loading area of the vehicle to be loaded and unloaded, for example in a pallet-like manner, by a fork stacker; rather, it is possible to exchange the entire loading area of the vehicle in the form of the platform  10 . 
     For this purpose, the platform  10  is shifted in the haulage direction A. For this purpose, the platform  10  has, on its underside, a multiplicity of rollers  19  accommodated in roller casings  18  (see  FIG. 2 ). On its upper side, the platform  10  is formed essentially as a planar and smooth surface, in order that articles, for example on pallets, can be arranged in a flexible manner on the platform  10 . It is possible here for retaining points or lashing points to be provided on the surface of the platform  10 , in order to allow the goods to be fastened on the surface of the platform  10 . Furthermore, the surface of the platform  10  may be configured with grooves or depressions, in order for the roughness of the surface of the platform  10  to be increased. This makes it possible, in particular in damp conditions, to reduce the risk of slipping, e.g. for individuals or also for fork stackers. 
     In order to be pulled downward from the loading area, or pulled out of a transfer station, the platform  10 , on at least one of its narrow edges, has at least one engagement means  11 , which may be designed, for example, as a pulling lug  11 . The pulling lug  11  here projects beyond the edge of the platform  10  in the haulage direction A, i.e. in the longitudinal direction A, at least to the extent where a haulage means, e.g. a hook, can engage in the pulling lug  11 , in order to pull the platform  10  in the haulage direction A. The pulling lug should be provided here such that, even in the case of a platform  10  being loaded right up to the edge, it can be gripped, i.e. it is not concealed by the articles on the platform  10  such that the hook cannot engage in the pulling lug  11 . It is also the case that the pulling lug  11  is provided such that it has a compression spring  12  and, for example, by virtue of a loading ramp of a truck being swung up, can be pushed into the platform  10  at least to the extent where the loading ramp of the truck can close fully, i.e., during closure of the loading area, the pulling lug  11  does not obstruct the loading ramp or the doors or the like of the loading area (see also  FIG. 6 ). 
     The platform  10 , on at least one of its narrow edges, has at least one platform-securing means  15 , which may be provided, for example, in the form of a lug  15 . The lug  15  serves as a holder for a load-carrier-securing means, which can connect the platform  10  in relation to the loading area of the truck such that, in particular when the truck is traveling, movement of the platform on the loading area of the truck in the haulage direction A is prevented. For this purpose, the loading area of the truck may have, for example, corresponding depressions, in which, for example, securing bolts engage through the lug  15 . 
     The platform  10 , on its narrow edge located opposite the platform-securing means  15 , also has at least one accommodating bore  17 , in which an end stop and/or a rolling-prevention means may be provided. 
     Furthermore,  FIG. 1 , at all four corners of the platform  10 , shows lateral rollers  16  which project both longitudinally and transversely to a slight extent beyond the dimensions of the platform  10  such that they can allow the platform  10  to roll for example in relation to a side wall of the loading area of a truck, but do not increase the dimensions of the platform  10  to any significant extent (see also  FIGS. 3 to 6 ). 
       FIG. 2  shows the platform  10  in a view from beneath. The elements and designations correspond to those in  FIG. 1 .  FIG. 2  also shows the roller casings  18 , which are incorporated in the underside of the platform  10  and in which the rollers  19  are provided. 
       FIG. 3  shows a perspective view of the platform  10  from above.  FIG. 4  shows a further perspective view of the platform  10  from above.  FIG. 3  here shows the left-hand edge of the platform  10  from  FIGS. 1 and 2 , this left-hand edge being oriented, for example toward the opening of the loading area of a truck.  FIG. 4  shows the right-hand edge of the platform  10  from  FIGS. 1 and 2 , this right-hand edge being directed toward the interior of the loading area of a truck. The elements and designations in  FIGS. 3 and 4  correspond to those in  FIGS. 1 and 2 . 
       FIG. 5  shows, in the upper region, a side view of the platform  10  and, in the lower region, two detail-form views of the left-hand and right-hand edges of the platform  10 . The elements and designations correspond to those in  FIGS. 1 to 4 . The two lower detail-form views in  FIG. 5  each illustrate the arrangement of the lateral roller  16 , which is provided in each case such that it can be rotated about the vertical axis C and is located at a corner of the platform  10 . The pulling lug  11  is illustrated in a state in which it projects beyond the platform  10  in the haulage direction A. 
     The illustration also includes the rollers  19  being incorporated in the roller casings  18  in the platform  10  such that they project only slightly beyond the underside of the platform  10 . This can give rise to as flat and compact a construction of the platform  10  as possible, and therefore the platform  10  of the loading area of the truck takes up only a small amount of height. 
       FIG. 6  shows a further detail-form view of the platform  10 . This figure illustrates the elements located in the interior of the left-hand edge of the platform  10 , i.e. of that side which is directed toward the tail of a truck, i.e. toward the opening of the loading area of a truck. An illustration is thus given of the pulling lug  11  with the compression spring  12 . The edge of the platform  10  here is configured such that the platform  10  contains a recess or a cavity in which the compression spring  12  is provided against an end stop such that it can be pushed in by the pulling lug  11  in the haulage direction A. The recess of the platform  10 , and the dimensioning of the force of the compression spring  12 , should be provided here such that the pulling lug  11  can be pushed into the recess of the platform  10  at least to the extent where it does not hinder, for example, the closure of the loading area of the truck. It is possible here for the pulling lug  11  to be pushed in for example by virtue of a loading ramp of the truck being swung up. It is also possible for the pulling lug  11  to take place into the platform  10  by virtue of the doors of the loading area being closed. 
     It is a special feature of the platform  10  according to the invention that it may be constructed in modular form from individual elements. This makes it very readily possible to provide a platform  10  of different lengths, in order for the platform  10  according to the invention to be adapted to the length of a loading area of a vehicle. For this purpose, use is made, according to the invention, of the principle of clicking together individual platform elements  10   a ,  10   b.    
     For this purpose, a first platform element  10   a  has a locking element  13   a , which can latch into a locking holder  13   b  of the second platform element  10   b .  FIG. 6  provides the locking element  13   a  in the form of a hook, which grips behind, and latches in, an edge corresponding to the locking holder  13   b . The locking element  13   a  here is configured such that, when the first locking element  13   a  is guided together with the second locking element  13   b , it is, in the first instance, pushed away from the locking holder  13   b , by the latter, and, finally, latches in said locking holder  13   b , in order for the first platform element  10   a  and the second platform element  10   b  to be locked to one another. For the purpose of releasing this locking, the locking element  13   a  can be raised again in relation to the locking holder  13   b  and released as a result. 
     The platform  10  in  FIG. 6 , furthermore, on the first platform element  10   a , has a recess  14   a , into which a protrusion  14   b  of the second platform element  10   b  can be introduced. The protrusion  14   b  and the recess  14   a  are provided here such that the second platform element  10   b  can execute a pivoting movement about the transverse direction B of the platform  10  in relation to the first platform element  10   a . The recess  14   a  and the protrusion  14   b  here are provided on the upper side of the platform  10 , and the locking element  13   a  and the locking holder  13   b  are provided on the underside of the platform  10 . This allows the second platform element  10   b  with its protrusion  14   b  to be inserted into the recess  14   a  of the first platform element  10   a  from above, in order for the two platform elements  10   a ,  10   b  to be positioned, in the first instance, in relation to one another. The second platform element  10   b  here is swung up in relation to the first platform element  10   a , and/or in relation to the horizontal plane, for example through an angle of 45 degrees. From this position, the second platform element  10   b  can then be swung downward, about the axis B, into the horizontal. The locking element  13   a  here, in the first instance, is raised by the locking holder  13   b , until the locking element  13   a , for example in the form of a hook, latches in the locking holder  13   b , for example in the form of an edge. The two platform elements  10   a ,  10   b  are thus similarly connected to one another. 
     Using the example of a platform  10 , i.e. of a load carrier  10 ,  FIGS. 1 to 6  show various aspects which lead to an advantageous design of the platform  10  in relation to the prior art. It is also possible, however, for the individual aspects to be realized independently of one another. Thus, for example, the lateral rollers  16  can be realized independently of the engagement means  11  according to the invention, i.e. the pulling lug  11 , or independently of the platform  10  being constructed in a modular manner according to the invention by platform elements  10   a ,  10   b . It is likewise possible to use, for example, the principle of the latching-in action of the platform elements  10   a ,  10   b  on platforms  10  without the latter, for this purpose, having to have the lateral rollers  16  or the engagement means  11  according to the invention. 
     A further exemplary embodiment of the platform  10  according to the invention is depicted in  FIGS. 7 to 11 .  FIG. 7 , first of all, shows a plan view of the platform  10  according to this exemplary embodiment. The platform  10  comprises a multiplicity of platform elements  10   a ,  10   b  lined up in a row one beside the other and connected to one another. The platform elements are arranged to alternate with one another and are fixed to one another.  FIG. 7  gives a clear view of the upper side of the platform  10  oriented as it should be for use. The upper side of the platform has a plurality of rollers  21 ,  23 ,  25  arranged in rows. To simplify the illustration, only one of the rollers has been provided with a designation. The first rollers  21  are arranged in a number of main rows  31 . The platform  10  has a number of, that is to say five, main rows  31  oriented parallel to one another, and one beside the other, in the longitudinal direction of the platform  10 . The platform  10  also has a number of first secondary rows  33  and second secondary rows  35 . The first secondary rows  33  have the second rollers  23 , which are arranged at a greater spacing apart from one another in the longitudinal direction of the platform  10  than the first rollers  21  of the main rows  31 . The second secondary rows  35 , the platform  10  in the present exemplary embodiment having two of these rows, comprise the third rollers  25 . The third rollers  25  are arranged at a greater spacing from one another than the first rollers  21 , but at a smaller spacing from one another than the second rollers  23 . The respective rollers are assigned to the platform elements  10   a ,  10   b  in each case such that three first rollers  21  are arranged one behind the other (in the longitudinal direction of the platform  10 ) on a platform elements  10   a ,  10   b , that, furthermore, two third rollers  25  are arranged one behind the other (in the longitudinal direction of the platform  10 ) on each platform element  10   a ,  10   b , and that, finally, in each case one further roller  23  is arranged (in the longitudinal direction of the platform  10 ) on each platform element  10   a ,  10   b . As seen in the transverse direction of the platform  10 , five sets of first rollers  21 , four sets of second rollers  23  and two sets of third rollers  25  are located one beside the other on each platform element, wherein the sets of first rollers  21  each comprise three rollers, the sets of second rollers  23  each comprise one roller and the sets of third rollers  25  each comprise two rollers. 
     The arrangement of the rollers can also be seen in detail in  FIG. 8 . That detail of the loading surface  27  of the platform  10  which is illustrated in  FIG. 8  also shows, in particular, the platform elements  10   a ,  10   b  arranged in an alternating sequence. The platform elements  10   a ,  10   b  are positioned relative to one another, and aligned in relation to one another in the longitudinal direction of the platform  10 , by means of securing bolts  41 . Also indicated is a spacing  28  between two adjacent rows of rollers, in this case the spacing between two adjacent main rows  31  comprising first rollers  21 . According to the invention, this spacing is smaller than, or equal to, 400 mm. 
     The functioning of the first, second and third rollers on the loading surface  27  of the platform  10  is indicated in  FIG. 9 . The spacings between the main and secondary rows, shown in detail in  FIGS. 7 and 8 , makes it possible to transport, for example, cartons  47  or pallets  45 , preferably designed as Europool pallets with an edge length of essentially 800 mm×1200 mm, such that always at least two adjacent rollers support the load items  45 ,  47  and thus allow easy displacement along the platform  10 . 
       FIG. 10  portrays, once again, the arrangement of the alternating platform elements  10   a ,  10   b  in a coupled state. As far as the recesses  14   a  and protrusions  14   b  are concerned, reference is made to what has been said above. In each case three first rollers  21 , each in separate roller casings  29 , are incorporated on the upper side of the platform  10 , that is to say on the side of the loading surface  27 . On the opposite, lower side of the platform  10 , the rollers  19  are accommodated in roller casings  18 . The securing bolts  41  are arranged in each case in the connecting region between two adjacent platform elements  10   a ,  10   b , preferably such that they correspond with two respectively corresponding recesses in the adjacent platform elements  10   a ,  10   b , in order to make possible the desired positioning in the transverse direction of the platform  10 . 
     The underside of the platform  10  that is finally shown in  FIG. 11  shows a preferred alternative arrangement of the rollers  19  for carrying the platform  10  according to the second exemplary embodiment of figures to  10 . The multiplicity of platform elements  10   a ,  10   b , which are arranged to alternate with one another, have different spacings between the rollers  19  arranged in each case on the platform elements  10   a ,  10   b . The rollers on the platform elements  19  here are arranged at a first spacing  37  from one another, whereas the rollers  19  on the second platform element  10   b  are arranged at a second spacing  39  from one another in each case, this second spacing differing from the first spacing  37  between the rollers  19  on the platform element  10   a . The spacing  39  is preferably two to three times the size of the spacing  37 . This gives rise to a better distribution of load over the multiplicity of rollers  19 —as seen in relation to the overall surface area of the platform  10 —as a result of which a higher level of stability of the platform  10  as a whole is ensured.