Abstract:
The invention relates to an apparatus for securing a container on a platform of a transport vehicle, in particular on a lifting platform of a floor-bound and automatically guided transport vehicle, with securing elements which are supported on the platform and bear against the container to secure same. A multiplicity of securing elements are arranged moveably on the platform in such a manner that, depending on the position and type of a container deposited on the platform, a first group of the multiplicity of securing elements is moved from the container into a passive position, and a second group of the multiplicity of securing elements is moved from the container into an operating position or remains in the operating position in which the second group of securing elements secures the container against slipping from the platform.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims the priority benefits of International Application No. PCT/EP2008/060838, filed on Aug. 19, 2008, and also of German Application No. 10 2007 039 780.3, filed on Aug. 23, 2007, both of which are incorporated herein by reference in their entireties. 
     
    
     FIELD OF THE INVENTION 
       [0002]    The invention relates to an apparatus for securing a container on a platform of a transport vehicle, in particular on a lifting platform of a floor-bound and automatically guided transport vehicle. 
       BACKGROUND OF THE INVENTION 
       [0003]    It is generally known to secure ISO-containers and/or swap containers on transport vehicles by means of so-called twist locks. For this purpose, the corners of the ISO-containers and/or swap containers are provided with standardised so-called corner castings, into which a locking element of the twist lock can be introduced and rotated in order to secure the ISO-container and/or swap container on the transport vehicle. Rotation of the locking element establishes a positive-locking connection between the corner casting and the locking element. This type of twist lock is described e.g. in the German laid-open document DE 196 06 263 A1. The twist locks therein are secured to opposite ends of transverse beams of a semi-trailer. In order to prevent the twist locks from protruding in their non-operative position beyond the ends of the transverse beams in an unwieldy manner, they can be pivoted in about a vertical axis. 
         [0004]    A further locking apparatus is also known from European Patent EP 0 996 562 B1, by means of which ISO-containers can be secured on a railway-car. This locking apparatus consists substantially of a stop element which can be pivoted open in the region of the end side of an ISO-container and which is held in a vertical position by means of an elongated knee lever. In this vertical position, the stop element lies against the end side and can thus prevent the ISO-container from sliding in its longitudinal direction on the railway-car. In order to prevent the ISO-container from lifting off from the railway car, a pin which engages into a recess in the end side of the railway-car is disposed on the end of the stop element remote from the railway-car. Moreover, the stop element can be pivoted from its vertical locking position to a horizontal non-operative position, in which it rests flatly on the loading surface of the railway-car and does not hinder a pivoting movement of a slightly raised ISO-container in the region of the railway-car. In its vertical locking position the stop element and its pin lie in the region of the corner castings of the ISO-container against the end side thereof. 
         [0005]    Furthermore, an apparatus for fixing an object on a movable plate, in particular a freight container on a loading surface of a rail or road vehicle is known from the German Patent DE 43 34 255 C2 and comprises several securing elements which are disposed so as to be distributed on the loading surface. These securing elements can be pivoted about a horizontal axis which is directed in the longitudinal direction of the vehicle. The securing element is substantially c-shaped in formation and comprises a first eye-shaped element and a second hook-shaped element. If a container is set down on a loading surface of the vehicle, then the sleeve is pressed into the loading surface from the underside of the container. As a consequence, the entire securing element is moved about the axis thereof and therefore the hook-shaped bent part of the securing element opposite the sleeve is pivoted in the direction of a sidewall of the container. The hook-shaped part then lies against a protrusion of the container which projects laterally from the sidewall. Several of these securing elements are disposed on the longitudinal sides of the platform of the transport vehicle, in order thus to lock in a lateral manner a container which is set down on the transport vehicle. 
         [0006]    Furthermore, a system for loading and unloading containers onto and off a ship is already known from the European patent specification EP 0 302 569 B1. This system comprises at least one quay crane for loading and unloading the container ships moored at a quay. The quay cranes are used to pick up the containers from a transport vehicle or to set the containers down on this transport vehicle. This transport vehicle is movable on the quay without the use of rails and is guided automatically by a controller. The container is unloaded by the transport vehicle or is picked up by the transport vehicle at a stationary transfer station. This transfer station consists substantially of positionally fixed support tables, onto which the containers are set down or from which the containers are picked up. These support tables are formed in the shape of support arms and support the container from below in the region of their longitudinal sides. Accordingly, the distance between the opposite support tables is designed to be smaller than the width of the containers. In order to be able to pick up the container from the support table or set it down thereon, it is provided that the transport vehicle comprises a platform for transporting the containers and either the transport vehicle overall or only its platform is raised for the purpose of transferring a container, the transport vehicle then moves, with the container now resting on its platform, out of the region of the support tables. When using a platform which can be raised and lowered, the platform still has to be lowered so that the transport vehicle can continue moving. In this case, the containers are set down on the support table in the opposite sequence. To ensure that the transport vehicle can pick up the containers from the transfer station, the lifting table has a width which is smaller than the distance between the opposite support tables. It is not described whether the container is additionally held on the platform of the transport vehicle. 
       SUMMARY OF THE INVENTION 
       [0007]    The present invention provides an apparatus for securing a container on a platform of a transport vehicle, in particular on a lifting platform of a floor-bound and automatically guided transport vehicle, by means of securing elements, which apparatus is characterised by a simple and secure construction. 
         [0008]    According to one aspect of the invention, an apparatus is provided for securing a container on a transport vehicle. The apparatus includes a lifting platform, a plurality of spindles, and a plurality of securing elements. The lifting platform has a a surface for supporting the container, and the spindles are positioned generally parallel with and below the surface of the platform, and disposed in a longitudinal direction of the platform. The securing elements are also supported on the platform, and are configured to selectively lie against the container to secure the container at the lifting platform. The securing elements are supported on respective spindles and are pivotable on the spindles between operating positions, a non-operative positions, and passive positions. The securing elements are two-armed levers each having a securing part and a weight part, and each of the securing elements is supported at its spindle at a portion of the securing element between the securing part and the weight part. A multiplicity of the securing elements are divided into first and second groups, and are moveable on the platform so that, depending upon the position and type of the container set down on the platform, the first group of the multiplicity of securing elements is moved by the container to a passive position and the second group of the multiplicity of securing elements is permitted by the container to move to an operating position (or remains in the operating position) so that the second group of securing elements secures the container to prevent it from sliding down off the platform. Further, the multiplicity of the securing elements are pivotable in the passive position by an undersurface of the container so that portions of the securing elements are substantially flush with the surface of the platform. In accordance with another aspect of the invention, in the case of an apparatus for securing a container on a platform of a transport vehicle, in particular on a lifting platform of a floor-bound and automatically guided transport vehicle, by means of securing elements which are supported on the platform and lie against the container in order to secure it, a simple and secure construction is achieved by virtue of a multiplicity of securing elements that are disposed so as to be movable on the platform such that depending upon the position and type of container set down on the platform, a first group of the multiplicity of securing elements is moved from the container to a passive position and a second group of the multiplicity of the securing elements is moved from the container to an operating position or remains in the operating position, in which the second group of securing elements secures the container to prevent it from slipping down off the platform. The multiplicity of securing elements helps ensure that the container set down on the platform is secured automatically even if the containers alternate within a known number of types and lengths. The securing elements in the passive position do not hinder the loading and unloading procedures. 
         [0009]    In one embodiment, the securing elements are mounted on the platform so as to be able to pivot between an operating position, a non-operative position, and a passive position, and are pivoted in the passive position by an undersurface of the container, optionally terminating flush with the surface of the platform, in the direction of the platform. 
         [0010]    A straightforward change between the individual operating positions and a reliable absorption of the securing forces may be achieved by mounting the securing elements on the platform so as to be able to pivot via spindles and the spindles are disposed in the longitudinal direction of the platform and in parallel with and below the surface of the platform. 
         [0011]    A simple gravitational force actuation of the securing elements may be accomplished by forming the securing elements as two-armed levers having a securing part and a weight part which are mounted in the middle on the spindles. In this case, the weight parts are dimensioned in such a manner that in a non-operative position of the securing elements, in which no container is set down on the platform, the securing elements protrude with a part of its securing part from the surface of the platform in the direction of a container to be set down thereon. As a result, this dispenses with any complex mechanical or manual actuation of the securing elements. 
         [0012]    In order to be able to hold the container on the platform, the securing elements are formed as lateral securing elements and longitudinal securing elements. In this case, the longitudinal securing elements in their operating position come to lie against an end side of a container which has slipped in the longitudinal direction of the platform, and the lateral securing elements in their operating position come to lie against an inner side of a corner casting of a container which has slipped transversely with respect to the longitudinal direction of the platform. The longitudinal securing elements may be formed in the manner of a strip having a point. 
         [0013]    It may be advantageous, convenient and secure that the lateral securing elements are formed in the manner of a strip and comprise on their end remote from the spindle an edge which in the operating position of the lateral securing elements protrudes laterally to a slight extent from the platform and at the height of the surface of the platform. The edge can transfer the holding forces between the corner casting and the platform in a reliable manner. 
         [0014]    In another embodiment, it is provided that, as seen in the direction of the spindle, the securing part has a parallelogram-like shape whose longitudinal side facing the container to be set down and the end side remote from the spindle taper towards one another in an obtuse-angled manner and form the edge. 
         [0015]    It may further be provided that the lateral securing elements are distributed in several groups on the platform such that containers of various sizes can be secured in each case in the region of their corner castings. The containers are further secured in this manner on the stable corner castings but outside the otherwise used, standardised openings in the corner castings. 
         [0016]    Safety may be increased by disposing the lateral securing elements on the platform in a redundant manner as a pair in relation to a corner casting to be secured. 
         [0017]    The apparatus provided for securing purposes may be used in a multi-purpose manner by distributing the longitudinal securing elements in several groups on the platform such that containers of various sizes can be secured in each case in the region of their end sides. 
         [0018]    It is adequate that rigid end securing elements instead of longitudinal securing elements are disposed in the region of the end surface of the platform. 
         [0019]    In the event that the platform is divided in its longitudinal direction into two platforms, the securing elements may be disposed in a mirror-inverted manner with respect to each other on the respective platforms. 
         [0020]    The previously described lateral securing elements may be particularly suitable if the width of the platform is smaller than the width of the container. Then, the corner castings having their standardised openings cannot be used for securing purposes. 
         [0021]    These and other objects, advantages, and features of this invention will become apparent upon review of the following specification in conjunction with the drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0022]      FIG. 1  is a perspective view of an automatically guided vehicle in a transfer station, 
           [0023]      FIG. 2  is a front elevation view of the vehicle and transfer station of  FIG. 1 , in which the lifting table of the vehicle is raised, 
           [0024]      FIG. 3  is a side elevation view of a lifting table in the raised position, 
           [0025]      FIG. 4  is a top plan view of a lifting table of a vehicle as shown in  FIG. 1 , 
           [0026]      FIG. 5  is a section enlargement of  FIG. 2  from the region of a lifting table and a container, 
           [0027]      FIG. 6  is a section enlargement of  FIG. 5  from the region of a corner of a lifting table, 
           [0028]      FIG. 7  is a side view of an end region of a 45-foot container on a lifting table, and 
           [0029]      FIG. 8  is a sectional view of  FIG. 7  along the sectional line A-A. 
       
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0030]      FIG. 1  illustrates a perspective view of an automatically guided vehicle  1  within a transfer station  2 . A transfer station  2  of this type can serve as an interface between the automatically guided vehicles  1  and another transport means such as, for example, a gantry crane having a spreader frame as a load receiving member or a high-legged and manned container-transport vehicle which is known in the art as a “straddle carrier.” 
         [0031]    The transfer station  2  includes a stationary support frame  3  having legs  3   a  in the form of vertical posts and support rails  3   b  secured thereto. The legs  3   a  are positioned at their lower end on a floor  4  which typically forms part of a quay in ports. At their end remote from the floor  4 , the legs  3   a  are slightly bent inwards, so that they appear slightly L-shaped as seen in the direction of travel F of the vehicle. Then, the support rail  3   b  is secured to the thus substantially vertically extending, upper end surface  3   c  of the legs  3   a . A total of six legs  3   a  are provided, of which in each case on the right-hand and left-hand side as seen in the direction of travel F three legs are each disposed at a spaced interval with respect to each other and with respect to the vehicle  1  which has pulled into the transfer station  2 . The right and left legs  3   a  are also disposed opposite one another. The spaced interval a between two oppositely disposed legs  3   a  is selected to be greater than the width b of the vehicle  1  so as to allow the vehicle  1  to pull in ( FIG. 2 ). In this case, the spaced interval a is about 100 mm larger than the width b. The opposite support rails  3   b  which are secured in each case to the end surfaces  3   c  of the legs  3   a  have an L-shaped cross-section as seen in the direction of travel F, wherein their long limb is secured to the end surfaces  3   c  of the legs  3   a  and the short limb forms a horizontal and inwardly facing support surface  3   d  for the container  5  to be set down thereon. The containers  5  are positioned, with their corner castings  23  which are stable and may be disposed in the lower corners and with their lower longitudinal sides  5   b  lying therebetween, on the support surfaces  3   d  of the support rail  3   b  when they have been set down at this location by the vehicle  1  or by another transport means. 
         [0032]    In order to set the containers  5  down on the support surfaces  3   d  or in order to pick up the containers  5  from the support surfaces  3   d , the vehicle  1  comprises a lifting table  7  which can be raised and lowered vertically relative to a vehicle frame  8  of the vehicle  1 . The lifting height of the lifting table  7  may be, for example, about 600 mm. It is apparent in  FIG. 1  that a first lifting table  7   a  and a second lifting table  7   b  are disposed on the vehicle frame  8  one behind the other as seen in the direction of travel F of the vehicle  1 . The length of an individual lifting table  7   a ,  7   b  may be selected in such a manner that a 20-foot container  5  can be transported thereon. The first lifting table  7   a  and the second lifting table  7   b  also may complement one another in the event that they are raised and lowered in a synchronous manner, to form a large lifting table on which 40-foot containers and even 45-foot containers can be transported. 
         [0033]    In  FIG. 1 , the vehicle  1  has just pulled into the transfer station  2 . This is typically performed in the automatic mode, so that the entry channel  6  having the width a between the opposite legs  3   a  of the support frame  3  must also only be slightly larger than the width b of the vehicle  1 . Before the vehicle  1  pulls into the transfer station  2 , the vehicle  2  has been stopped briefly in order to raise the first lifting table  7   a  and the second lifting table  7   b  with the respective containers  5  in each case from their lower transport position to their upper lifting position. In this lifting position the lifting surfaces  7   c  of the respective lifting tables  7   a ,  7   b , on which the containers  5  are positioned, protrude beyond the vertically inwardly extending support surfaces  3   d  of the support rails  3   b . As seen in the direction of travel F, the lifting tables  7   a ,  7   b  have a smaller width c than the spaced interval d between the support surfaces  3   d  of the opposite legs  3   a  of the support frame  3  ( FIG. 2 ). Therefore, with the lifting tables  7   a ,  7   b  raised in the lifting position the vehicle  1  can pull into the transfer station  2 , without the lifting table  7   a ,  7   b  coming into contact with the support rails  3   b . The lifting surfaces  7   c  of the lifting tables  7   a ,  7   b  are also located above the support surfaces  3   d , so that as the vehicle  1  pulls into the transfer station  2  the undersurfaces  5   a  of the containers  5 , in particular their fastening elements  23 , is/are located above the support surfaces  3   d . If the vehicle  1  has pulled into the transfer station  2  to the required depth, the lifting tables  7   a ,  7   b  are lowered to their transport position and the containers  5  are set down with their corners  23  and their longitudinal sides  5   b  on the support surfaces  3   d  of the support rail  3   b . The vehicle  1  can then leave the transfer station  2  with its lowered lifting tables  7   a ,  7   b  whilst leaving the containers  5  behind on the support frame  3 . 
         [0034]    In order make it easier to set the containers  5  down onto the first lifting table  7   a  and the second lifting table  7   b , which for this purpose are each located in their lower transport position, hopper-like guide elements  9  are provided on the vehicle frame  8  of the vehicle  1  on the right-hand and left-hand side as seen in the direction of travel F of the vehicle  1  next to the lifting tables  7   a ,  7   b  in each case in their initial and end regions. These guide elements  9  have a guide surface  9   a  ( FIG. 2 ) which is directed inwardly with respect to the lifting tables  7   a ,  7   b  and which widens in an upwards direction starting from the vehicle frame  8  and thus aligns a container  5  laterally in the direction of the lifting table  7   a ,  7   b  as it is being lowered onto the lifting tables  7   a ,  7   b.    
         [0035]    It is also apparent in  FIG. 1  that the vehicle  1  is not a rail vehicle but rather is a vehicle  1  having tires  1   a.    
         [0036]      FIG. 2  illustrates a front view of  FIG. 1  in the direction of travel F of the vehicle  1  in the transfer station  2 . The container  5  illustrated in this  FIG. 3  and the second lifting table  7   b  are located in the raised lifting position, as also shown in  FIG. 1 . It is apparent that the corner castings  23  of the container  5  are located at a spaced interval e above the support surfaces  3   d  of the support rails  3   b . This spaced interval e can vary, for example, between 50 and 150 mm depending upon the loading state of the container  5  and the inflation pressure of the tires  1   a.    
         [0037]    It is also readily apparent that the container  5  has a width f which on both sides protrudes beyond the lifting table  7 ,  7   b  with its width c. In order to be able to secure the container  5  in the raised lifting position in a reliable manner on the lifting table  7 ,  7   b  so as to prevent it from slipping, various groups of securing elements  14 ,  15   a ,  15   b ,  15   c  and  16   a ,  16   b  are disposed on the lifting tables  7 ,  7   b  ( FIGS. 2-4 ). In particular, they are end securing elements  14 , lateral securing elements  15   a ,  15   b ,  15   c  and longitudinal securing elements  16   a ,  16   b , of which the lateral securing elements  15   a ,  15   b ,  15   c  detain the container  5  in the event of it slipping laterally on the lifting table  7 ,  7   a ,  7   b  and the end securing elements  14  and the longitudinal securing elements  16   a ,  16   b  prevent the container  5  from slipping in the direction of travel F of the vehicle  1  and thus in the longitudinal direction of the container  5  on the lifting table  7 ,  7   a ,  7   b.    
         [0038]      FIG. 2  illustrates two end securing elements  14  and two longitudinal securing elements  16   a ,  16   b . In this case, longitudinal securing elements  16   a ,  16   b  protrude from the lifting table  7  upwards and lie against one of the two end sides  5   c  of the container  5  in the region of its lower edge. The end securing elements  14  are disposed on one of the two end surfaces, and in fact on the outer end surface  7   c , of the lifting table  7   c  and are not in contact with the container  5 . The lateral securing elements  15   a ,  15   b ,  15   c  are not illustrated in  FIG. 2 . 
         [0039]      FIG. 3  illustrates a side view of the second lifting table  7   b  and of the adjoining vehicle frame  8 . The lifting table  7   b  is located in its raised position. The lifting table  7   b  is lifted and lowered by a lifting drive  10  which includes a drive  11 , two adjusting spindle drives  12   a ,  12   b  and two knee levers  13   a ,  13   b . In essence, it is also possible to use other types of lifting drives such as e.g. hydraulic lifting drives. 
         [0040]    It is also apparent in  FIG. 3  that the end securing elements  14 , lateral securing elements  15   a ,  15   b ,  15   c  and longitudinal securing elements  16   a ,  16   b  are disposed in such a manner as to be distributed on the surface  7   d  of the lifting table  7   b , in order to be able to secure the various lengths of container  5  such as 20 foot, 40 foot and 45 foot. Disposed on the outer end surface  7   c  of the lifting table  7   b  are two end securing elements  14  ( FIGS. 3 and 4 ) which are rigidly connected to the end surface  7   c  and extend from the surface  7   d  of the lifting table  7   b . As seen transverse to the longitudinal extension, the end securing elements  14  are disposed so as to be spaced apart from one another and offset with respect to the sides of the lifting table  7   b  (see  FIGS. 2 and 4 ). In this case, the arrangement of the end securing elements  14  is selected in such a manner that the locking elements  17  provided on the container  5  for the doors  18  of the container  5  do not come to lie against the end securing elements  14 . Furthermore, the end securing elements  14  are formed so as to be widened upwards with regard to a container  5  which is to be set down onto the lifting table  7   b . Overall, the end securing elements  14  are formed as strip-shaped profile bars which are welded rigidly to the lifting table  7   b . The end sides of 20-foot containers  5  and those of 45-foot containers may come to lie against the rigid end securing elements  14 . 
         [0041]      FIG. 3  also illustrates longitudinal securing elements  16   a ,  16   b  at two different locations as seen in the longitudinal direction of the lifting table  7   b . The longitudinal securing elements  16   a ,  16   b  are each located in the vicinity of the front and rear end surface  7   c  of the lifting table  7   b  and in the non-operative position and also the operating position protrude from the surface  7   d  of the second lifting table  7   b . The longitudinal securing elements  16   a , which are at the front as seen in the longitudinal direction of the lifting table  7   b  and starting from the end securing elements  14 , serve to secure a 40-foot container  5  and the longitudinal securing elements  16   b , which are at the rear as seen in the longitudinal direction of the lifting table  7   b , and starting from the end securing elements  14 , serve to secure a 20-foot container  5 . The other end of the 20-foot container  5  is secured by the end securing elements  14 . In order to secure the other end of the 40-foot container  5 , corresponding longitudinal securing elements  16   a  are disposed on the first lifting table  7   a  in a minor-inverted manner. 
         [0042]    Furthermore,  FIG. 3  illustrates three groups of lateral securing elements  15   a ,  15   b ,  15   c , of which each group comprises a pair of redundant lateral securing elements  15   a ,  15   b ,  15   c . In their non-operative position, i.e. when no container  5  is set down on the lifting table  7 , the lateral securing elements  15   a ,  15   c ,  15   c  protrude upwards partially from the surface  7   d  of the lifting table  7 . Starting from the end securing elements  14  and in the longitudinal direction of the lifting table  7 , a pair of front lateral securing elements  15   a , a pair of central lateral securing elements  15   bc  and a pair of rear lateral securing elements  15   c  are disposed on the second lifting table  7   b . In the operating position, i.e. when a container  5  is set down on the lifting table  7 , the lateral securing elements  15   a ,  15   b ,  15   c  provide the function of a defined stop surface for the corner castings  23   a  of the containers  5 . Should a container  5  slip laterally on the raised container  5 , the corner casting  23  of the container  5  comes against the lateral securing element  15   a ,  15   b ,  15   c  and thus prevents any further slippage. Therefore, in a corresponding manner the front lateral securing elements  15   a , the central lateral securing elements  15   b  and the rear lateral securing elements  15   c  are disposed on the second lifting table  7   b , as seen in the longitudinal direction of the lifting table  7   b , in each case laterally adjacent and inwardly offset with respect to the corner castings  23  of the containers  5  which are to be transported and which can be, for example, 20, 40 and 45 feet in length. In the illustrated embodiment, the front lateral securing elements  15   a  serve to secure the corner castings  23  of a 45-foot container or a 20-foot container, the central lateral securing elements  15   c  serve to secure the corner castings  23  of a 40-foot container, and the rear lateral securing elements  15   c  serve to secure the corner castings  5   a  of a 20-foot container. The opposite corner castings  23  of the 45-foot containers or of the 40-foot containers are secured by the front lateral securing elements  15   a  and central lateral securing elements  15   b  which are disposed in a minor-inverted manner on the first lifting table  7   a.    
         [0043]      FIG. 3  illustrates the second lifting table  7   b . It will be appreciated that the first lifting table  7   a  is constructed in an identical but laterally reversed manner, so that the end securing elements  14  for the 45-foot container  5  are located the furthest distance apart. 
         [0044]    The aforementioned laterally reversed construction is also clearly illustrated in  FIG. 4  which illustrates a plan view of the first lifting table  7   a . In this case, the outer end securing elements  14  are to be found accordingly on the outer lateral surface  7   e  of the first lifting table  7   a  and in the left-hand region in  FIG. 4 . In relation to the front lateral securing elements  15   a , the central lateral securing elements  15   b  and the rear lateral securing elements  15   c , it can be seen that they are each disposed adjacent to the lateral surface  7   e  of the first lifting table  7   a , in order to be in the operating state in the vicinity of the corner castings  23  of the container  5 . 
         [0045]      FIG. 5  illustrates a section enlargement illustration of  FIG. 2  from the region of the lifting table  7   b  and of the container  5  set down thereon, wherein the container  5  includes a securing central lateral securing element  15   b  and a securing front longitudinal securing element  16   a  as shown. All of the lateral securing elements  15   a ,  15   b  and  15   c  and longitudinal securing elements  16   a ,  16   b  are formed as two-armed levers consisting of a sheet steel strip with a securing part  15   d ,  16   d  and a weight part  15   e ,  16   e . Approximately in the center, each lateral securing element  15   a ,  15   b  and  15   c  and longitudinal securing element  16   a ,  16   b  is mounted so as to be able to pivot about a spindle  19 ,  20 . In this case, the spindles  19 ,  20  are aligned in parallel with the surface  7   d  and in the longitudinal direction of the first lifting table  7   a  and are disposed below the surface  7   d  of the first lifting table  7   a . The securing parts  15   d ,  16   d  have a central opening  21 ,  22  in order to make them lighter than the weight part  15   e ,  16   e . Moreover, the flat securing part  15   d  of the lateral securing element  15   a ,  15   b ,  15   c  is tapered. 
         [0046]    The longitudinal securing elements  16   a ,  16   b  are balanced in such a manner that in the non-operative position, i.e. when no container  5  is set down on the lifting table  7 , and in the operating position, i.e. when a container  5  is set down on the lifting table  7  with its end surface  7   c  adjacent to the longitudinal securing elements  16   a ,  16   b , the securing part  16   d  protrudes from the surface  7   d  of the lifting table  7   b  approximately at an angle of 45 degrees. The angle of 45 degrees has been selected so that the securing part protrudes with an adequate length from the surface  7   d  of the first lifting table  7   a , in order to secure the container  5  on its end surface  7   c  to prevent it from slipping. Moreover, the longitudinal securing elements  16   a ,  16   b  can be located in a third position and furthermore in a passive position, i.e. when a container  5  stands on the longitudinal securing elements  16   a  and pivots it against the gravitational force of the weight part  16   e  into the lifting table  7   a  (see  FIG. 8 ). 
         [0047]    It is also possible that in the operating position the longitudinal securing elements  16   a ,  16   b  are urged by the locking elements  17  slightly in the direction of the surface  7   d  of the lifting table  7  but continue to protrude from the surface  7   d  of the lifting table  7  to an adequate extent such as at an angle of 30 degrees. 
         [0048]    The lateral securing elements  15   a ,  15   b  and  15   c  are balanced differently than the longitudinal securing elements  16   a ,  16   b , so that in the non-operative position they protrude from the surface  7   d  of the lifting table  7   b  at an angle of 30 degrees. In the operating position, the lateral securing elements  15   a ,  15   b  and  15   c  are pivoted by the undersurface  5   a  of the container  5  downwards to the surface  7   d  of the lifting table  7 . In the operating position, the longitudinal axis of the securing part  15   e  is disposed at an angle of about 5 degrees with respect to the surface  7   d  of the lifting table  7 . The securing part  15   e  is formed in such a manner that it has an edge  15   f  which extends in the longitudinal direction of the lifting table  7  and in parallel with the spindle  19  and extends over the entire width of the securing part  15   e . The edge  15   f  is disposed on the end of the securing part  15   e  remote from the spindle  19 . As seen in the longitudinal direction of the lifting table  7 , the securing part  15   e  has a parallelogram-like shape. Therefore, it has two mutually parallel longitudinal sides  15   g  which at the end remote from the spindle  19  are connected to each other by means of an end side  15   h . In the region of the acute-angled edge  15   f , the angle between the longitudinal side  15  and the end side  15  is about 75 degrees. In a corresponding manner, the angle between the longitudinal side  15   g  and the end side  15   h  is about 105 degrees in relation to the rounded corner  15   i.    
         [0049]      FIG. 5  does not illustrate the container  5  in its normal transport position but rather in a position which has slipped laterally in the direction of the lifting table  7 , in order to explain in more detail the function of the lateral securing elements  15   a ,  15   b ,  15   c . In the operating position, the lateral securing elements  15   a ,  15   b ,  15   c  protrude with their edges  15   f  slightly from the lifting table  7 , as their longitudinal edge  7   f  is rounded and the edges  15   f  are acute-angled. A container  5  which slips laterally on the lifting table  7  comes to lie with its inner surface  23   a  of the cubical corner casting  23  against the edge  15   f  of the lateral securing element  15   a ,  15   b ,  15   c  and is thus detained. The inner surface  23   a  is produced by virtue of the fact that the corner casting  23  protrudes slightly from the underside  5   a  of the container  5 . 
         [0050]    It is also advantageous that the lateral securing elements  15   a ,  15   b ,  15   c  are pivotally mounted on the lifting table  7  and therefore the contact of the inner surface  23   a  with the edge  15   f  of the lateral securing elements  15   a ,  15   b ,  15   c  is set according to the positioning of the lateral securing elements  15   a ,  15   b ,  15   c  and thus is an improvement in the manner in which the edge  15   f  lies against the inner surface  23   a.    
         [0051]    It is also apparent in  FIG. 5  that the lateral securing elements  15   a ,  15   b ,  15   c  are each disposed in a redundant manner as pairs on a common spindle  19 . To illustrate this, the rear lateral securing elements  15   a ,  15   b ,  15   c  are illustrated in their non-operative positions. This position can be assumed by the second lateral securing element  15   a ,  15   b ,  15   c  of a pair, if the undersurface  5   a  of the container  5  comprises beads or transverse recesses, not illustrated, and is thus not urged downwards in the direction of the surface  7   d  of the lifting table  7 . The securing function is retained, as the securing part  15   e  also comes to lie against the inner side  23   a  of the corner casting  23 , wherein the corner casting  23  of the container  5  slides easily onto the rounded edge of the lifting table  7 . 
         [0052]      FIG. 6  illustrates an enlargement of the left-hand upper corner of the lifting table  7  as shown in  FIG. 5 . It is apparent that as seen in the longitudinal direction of the lifting table  7  the pairs of lateral securing elements  15   a ,  15   b  are mounted in such a manner as to be able to pivot on a common spindle  19  and are mounted one behind the other and at a small spaced interval with respect to each other. As in  FIG. 5 , the respective first one of the two lateral securing elements  15   a ,  15   b , which is disposed in each case in closer proximity to the end securing element  14 , is illustrated in the operating position and the second one is illustrated in the non-operative position. Therefore, the second lateral securing element  15   a ,  15   b  appears to be shorter than the first, although both are formed in an identical manner. It is also apparent that the end securing element  14  and the longitudinal securing element  16  are located in a similar position relative to the associated lateral securing elements  15   a ,  15   b.    
         [0053]      FIG. 6  also shows that the spindles  19 ,  20  for mounting the lateral securing elements  15   a ,  15   b ,  15   c  and the longitudinal securing elements  16   a ,  16   b  are secured by plates  23 ,  24  to the underside of the surface  7   d  of the lifting table  7 . It can also be seen that disposed in the surface  7   d  of the lifting table  7  are rectangular openings  26 , by means of which the lateral securing elements  15   a ,  15   b ,  15   c  and the longitudinal securing elements  16   a ,  16   b  protrude from the surface  7   d  of the lifting table  7  or are received therein. 
         [0054]      FIG. 7  illustrates a side view of an end region of a 45-foot container  5  on the lifting table  7 . The 45-foot container  5  typically has corner castings  23  and additional corner castings  27  in the region of the length of a 40-foot container  5 . The central lateral securing elements  15   b  and front longitudinal securing elements  16   a ,  16   b  are urged downwards by the corner castings  27  of the 45-foot container  5  or the adjoining undersurface  5   a  and thus do not hinder the pick-up and transportation of the container  5 . In addition to the front lateral securing elements  15   a , one of the two central lateral securing elements  15   b  is located in a position, in the event of the container  5  slipping, to secure the container by abutment against the inner surface  27   a  of the corner casting  27 . 
         [0055]      FIG. 8  illustrates a sectional view of  FIG. 7  along the sectional line A-A. This Figure illustrates clearly that the central lateral securing elements  15   b  and the front longitudinal securing elements  16   a  are pivoted downwards by the undersurface  5   a  of the container  5 . 
         [0056]    In terms of the invention, the term “container  5 ” refers to ISO-containers and/or swap containers. It will be appreciated that in the present invention, it is also advantageous that the lateral securing elements  15   a ,  15   b ,  15   c  and the longitudinal securing elements  16   a ,  16   b  are not to be driven but rather are moved merely by the respective weight  15   e  and  16   e  or the container  5  set down thereon. 
         [0057]    Changes and modifications in the specifically described embodiments may be carried out without departing from the principles of the present invention, which is intended to be limited only by the scope of the appended claims, as interpreted according to the principles of patent law including the doctrine of equivalents. List of reference numerals
     1  automatically guided vehicle     1   a  tires     2  transfer station     3  support frame     3   a  legs     3   b  support rail     3   c  end surface     3   d  support surface     4  floor     5  container     5   a  undersurface     5   b  longitudinal side     5   b  end side     6  entry channel     7  lifting table     7   a  first lifting table     7   b  second lifting table     7   c  end surface     7   d  surface     7   e  lateral surface     7   f  longitudinal edge     8  vehicle frame     9  guide element     9   a  guide surface     10  lifting drive     11  drive motor     12   a ,  12   b  adjusting spindle drive     13   a ,  13   b  knee lever     14  end securing elements     15   a  front lateral securing elements     15   c  central lateral securing elements     15   c  rear lateral securing elements     15   d  securing part     15   e  weight part     15   f  edge     15   g  longitudinal side     15   h  end side     15   i  corner     16   a  front longitudinal securing elements     16   b  rear longitudinal securing elements     16   d  securing part     16   e  weight part     17  locking element     18  door     19  spindle     20  spindle     21  opening     22  opening     23  corner casting     23   a  inner surface     24  plate     25  plate     26  openings     27  corner casting     27   a  inner side   a spaced interval   b width   c width   d spaced interval   e spaced interval   F direction of travel   f width