Stacking device for transport trolleys

Abstract

Stackable transport trolley (1) with a support frame (5) which has sleeve profiles (6) in corner areas into or onto which upwardly projecting corner supports (4) can be inserted or attached, by means of the interaction of which with lower areas of sleeve profiles (6) of a further transport trolley (1) the latter can be supported, characterized in that the transport trolley (1) has stacking safety devices (9) which are freely movable from the transport trolleys, each of which has a sleeve body (17) at at least one axial end;17a) form, in the area of ​​the upper ends (8) of the corner supports (4), which each hold a lower area of ​​a sleeve profile (6) of the upper transport trolley (1) and an upper area (8) of a corner support (4) in a forced alignment and tilt-proof manner relative to each other, wherein the stacking safety device (9) can be released without tools relative to the upper and lower transport trolley (1) and has at least one locking projection (10) which prevents the stacking safety device (9) from sliding downwards on the corner support (4).

Description

[0001] The invention relates to transport trolleys according to the preamble of claim 1 and stacking securing devices according to the preamble of claim 15, 22 or 23.

[0002] It is common practice to secure cargo in transport vehicles, especially road transport vehicles, by tensioning it with straps. The cargo is often held on pallets, making it easy to tension the load with overlapping straps downwards, for example against perforated rails located lengthwise on the side of the vehicle, as a form of stack securing.

[0003] However, among other things, wheeled CC containers or DC / EC containers, primarily for plants, are known to be used as cargo. These containers have only a stable base directly above their wheels and above that, only a few corner bars that are easily deformable and relatively easy to bend inwards or outwards. Over time, these corner bars develop various deformations and are therefore problematic from a stability standpoint, especially when used to support another transport trolley placed above them. When several containers of this type are stacked on top of each other, deformation of the lower ones can cause the upper layers to tilt, become misaligned, or even fall, leading to personal injury and property damage.

[0004] Recently, accidents involving stacked trolleys have occurred, resulting in finger crushing and similar serious injuries. This problem is exacerbated by the fact that a stack of these trolleys is designed for a total load of up to 400 kg, meaning that even when stacked twice, the upper trolley transfers a load of 200 kg, distributed across its four corner supports, into the lower trolley – that is, a load of 50 kg per corner support.

[0005] The corner supports, typically designed as open square profiles, are inserted into lower frame sleeves, each of which is an integral part of the base frame of such a transport trolley. With a height of approximately 74 to 78 centimeters for these corner supports, there is no further support above the frame sleeves, which extend only slightly vertically. Furthermore, these corner supports often vary in height by one to two centimeters, further increasing instability during stacking and the risk of an upper layer tipping over, thus creating a crushing hazard.

[0006] German patent DE 10 1006 050 452 A1 discloses a stackable transport trolley with corner sections featuring sleeve profiles. These profiles are firmly gripped from below by wider base sections. These base sections can be placed on the upper ends of sleeve profiles of a container positioned below, thus enabling stacking. However, the corner supports cannot be inserted individually and therefore do not have different heights relative to each other.

[0007] DE 20 2005 013 047 U1 discloses a rack with several shelves stacked on top of each other, the bottom shelf being part of a base element with sleeve profiles in the corner areas. These sleeve profiles are firmly gripped at their bottom by wider receiving sleeves. These receiving sleeves have multiple stepped and inwardly recessed centering elements at their lower ends. The base element can be placed directly onto another via the wider centering element, and onto a support bar via the second, further inwardly recessed centering element. All centering elements are permanently welded to the receiving sleeve and therefore do not offer a solution for improving existing racks that do not have this arrangement.

[0008] NL 1 008 366 C shows supports with fixed sleeve profiles that are unchangeable and therefore could not be used or retrofitted to the existing corner supports.

[0009] US Patent 3,709,163 A demonstrates the possibility of securing parts against pull-out using a stacking clamp, specifying a U-shaped, transversely inserted retaining clip as the stacking clamp. However, this can only be attached if the corner supports have been fitted with corresponding Hale flanges, which is unrealistic as a retrofit option and would also result in excessively wide supports, thus making the packing dimensions in the truck too large.

[0010] DE 20 2006 017 077 U1 also only shows additional brackets welded permanently to vertical supports, which are secured by further external fasteners such as clamps or bolts. Here too, there is no possibility of retrofitting existing supports, as the additional fasteners require too much width.

[0011] The invention is based on the problem of achieving an improvement in safety.

[0012] The invention solves this problem by means of a transport cart with the features of claim 1 and by means of a stacking safety device with the features of claims 15, 22 and / or 23. Further advantageous features and embodiments of the invention are set forth in claims 2 to 14 and 16 to 21.

[0013] In the embodiment according to the invention, as described in claim 1, a means is provided to securely support an upper transport trolley on the corner supports of a transport trolley located below it, without the upper transport trolley being able to slip or tip over. This stacking can, for example, involve the second layer on top of a first, lower layer of transport trolleys, or the third, uppermost layer on top of a second, middle layer of transport trolleys. The solution can be retrofitted to an existing transport trolley; there is no need to design entirely new transport trolleys.

[0014] In the embodiment according to claim 2, effective protection against hand entrapment and against the tipping of the sleeve profile against the corner support below is achieved by the fact that the lower end of each sleeve profile of the upper transport trolley is enclosed at least substantially laterally in the manner of a cuff. This solution can also be retrofitted to an existing transport trolley; it is not necessary to design entirely new transport trolleys.

[0015] The stacking safety device can be an integral part of the corner support. A particularly advantageous way to reuse existing corner supports is if the stacking safety device is a retrofittable component that, due to its small dimensions (maximum edge length of approximately 150 millimeters or less), can be carried in large quantities in trucks.

[0016] If the stacking locks are separate, movable parts independent of the transport trolleys, it is particularly advantageous if the stacking lock can be detached from both the upper and lower transport trolleys without tools. This allows even untrained personnel to attach and remove the stacking locks in seconds.

[0017] In particular, each of the corner supports of a lower transport trolley can be equipped with a stacking safety device in order to achieve good all-round protection against slippage of an upper transport trolley and against the risk of pinching.

[0018] The stacking safety device is particularly advantageous because it is dimensionally stable, so that it not only forms a clamping safety device for the hand, but also, with its own stability, prevents lateral movement of the upper transport trolley and thus prevents it from slipping.

[0019] A stacking safety device can be conveniently mounted on the upper, open end of a corner post and should have at least one locking element that prevents the device from sliding downwards on the corner post. When the device is placed on the corner post, this locking element automatically engages, thus preventing the device from sliding downwards in any case. Alternatively, the stacking safety device can also be permanently attached to a corner post or be attachable to it.

[0020] The securing element can be formed by one or more punched-out and inwardly bent retaining tongue(s) which, in use, rest on an upper edge of the corner support.

[0021] The securing mechanism can be very advantageously formed by one or more webs which, in the assembled position, rest on or are located on the upper end of a corner support and thereby securely hold the stack securing mechanism.

[0022] If two ribs are provided as a securing mechanism, spaced apart from each other, diagonally bent ends of a lower end of a sleeve profile of an upper transport trolley can engage between them and thus be held particularly securely against slipping.

[0023] The stacking safety device can be designed in a sleeve-like form, for example with a square profile, and in the assembled position, i.e., placed on the corner post, it encompasses both the upper end of the corner post and the lower end of the sleeve profile on the outside. The sleeve-like design of the stacking safety device then extends over its entire length and can thus be easily and inexpensively cut to length from an extruded profile.

[0024] Such a transport trolley typically and advantageously features a support frame comprising horizontal profiles connected to the sleeve profiles. At least part of the connection area is stiffened by a vertical web, and these webs project downwards from the profiles. To prevent the stacking restraints from engaging beneath the web and becoming unstable, a particularly advantageous embodiment provides each stacking restraint with at least one recess in its upper section. In the assembled position, the web of the upper transport trolley engages in this recess. This allows the stacking restraint to extend upwards to the horizontal profiles, ensuring that these profiles rest securely on the upper edge of the stacking restraint despite the aforementioned web.

[0025] The recess is advantageously designed as a vertical slot, into which the web serving as a gusset plate can be inserted from above. The stability of the stacking mechanism is nevertheless not significantly weakened by the narrow recess.

[0026] If the stacking device comprises a square profile and at least in two diagonally opposite upper corner areas such a recess for a web is provided, such a stacking device can be placed on any corner supports, regardless of whether it is a left or a right corner and regardless of whether the web extends from this corner to the left or to the right.

[0027] As explained further below, if such a recess is arranged symmetrically in a corner area, a single recess may be sufficient to cover all insertion orientations.

[0028] In both cases, a single type of stacking safety device is sufficient, making both assembly and logistics particularly easy.

[0029] A stacking safety device, independent of the transport trolleys and suitable for storage, is claimed separately. It forms a sleeve body at at least one axial end, namely the upper end in the mounted position, with a clear inner diameter of at least 40 millimeters and a length of at least 120 millimeters. Inside, it has at least one locking projection extending into its interior, which stops any movement that could penetrate the interior. This prevents the device from sliding past a corner support as a potential penetrating element.

[0030] If the sleeve body of the stacking safety device has a square profile in cross-section, it can tightly grip the corner support and also the lower end of a sleeve profile of an upper support frame - without risk of pinching fingers - and in a twist-proof manner.

[0031] If the sleeve body of the stacking device has at least one recess located in its corner region at an axially outward-facing end, it can allow a bridge of the transport trolley to be inserted into it. In particular, the recess has an axial slot of at least 25 millimeters in height, so that a bridge approximately 25 millimeters high can be fully inserted. The advantage of at least two recesses formed in diagonally opposite corner regions of the sleeve body has already been explained above. This means that a single type of stacking device can suffice for all corners of a transport trolley.

[0032] The stack securing device comprises, in particular, a sleeve body cut to length from the extruded profile at a low cost, which advantageously extends over the entire axial length of the stack securing device.

[0033] Further advantages and features of the invention will become apparent from exemplary embodiments of the subject matter of the invention shown in the drawing and described below.

[0034] The drawing shows: Fig. 1 a schematic perspective view of a supporting frame of a so-called CC container with a rectangular base and four upwardly open frame sleeves in the corner areas, the wall areas of which are shaped downwards to a tapered point, Fig. 2. Detailed view of one of the corner areas in Fig. 1 with an inserted corner support which, at its upper end, supports an engaging tip of the frame sleeve of another transport trolley, for example another CC container, in the previously usual manner, Fig. 3 the upper corner area in an embodiment according to the invention with a stacking safety device having a sleeve body which has at least one recess, Fig. 4 a cross-sectional view of the upper corner area after Fig. 3, wherein two spaced-apart webs are provided at the stacking safety device, between which the downward-pointing tip of the frame sleeve of the upper transport trolley engages, Fig. 5 a similar view to Fig. 4, however, an alternative design with a stacking safety device, in which a sleeve body is provided in the upper area for gripping the lower end of the frame sleeve of the upper transport trolley and an engagement body is provided in the lower area for engaging the inner area of ​​the rising corner support, Fig. 6 the stack securing after Fig. 4 in perspective view, with the end pointing upwards in the mounted position pointing forwards here, Fig. 7 a top view of the stack securing after Fig. 6, Fig. 8 a side view of the stack lock in position after Fig. 7, Fig. 9 a similar view to Fig. 7, however, in a position rotated by 90° around a longitudinal axis, Fig. 10 a side view of the stack lock in position after Fig. 9.

[0035] The transport trolleys or containers 1 according to the invention can be transported, for example, in trucks, freight cars, or other enclosed vehicles or aircraft. The cargo spaces can, for example, have rigid side walls with one or more rails embedded in these side walls, each with a multitude of mounting holes. Tarpaulin covers are also possible. Such transport trolleys 1 are also used for stationary storage, such as for overwintering young plants.

[0036] When filled, the transport trolleys 1 are stacked in the loading or storage area, for example, in three layers of rollable CC containers or DC or EC containers, resulting in the aforementioned problems and risk of injury. These containers 1 each have rollers 2 on their underside, which are mounted downwards on a stable base 3, such as a plywood board.

[0037] These types of containers are often loaded with plants in an open-top configuration. Even a single layer of such CC or EC containers is possible, for example. Empty transport with folded corner supports or crossbeams (4) is also possible, allowing up to 14 layers of these containers to fit on top of each other in the cargo space.

[0038] The stackable transport trolleys 1, which in their basic form are available in the market in the millions, each have a rectangular support frame 5 in plan view, which is provided in four outer corner areas with upwardly open sleeve profiles 6. These extend vertically 10 to 20 centimeters high parallel to the longitudinal axis 14 and have tabs 7 at their lower ends that are bent conically to a point.

[0039] As in Fig. As is clearly visible, 6 upward-projecting corner supports or stiles can be inserted into the open-topped sleeve profiles. These are available in different lengths. Typical lengths are approximately 74 to 78 centimeters.

[0040] These corner supports 4 can, with their upper ends 8, serve as supports for sleeve profiles 6 of another transport cart 1, which engage with these upper ends 8 via the tabs 7. The aforementioned risk of injury arises in this area, particularly because the corner supports 4 often become bent over time and corner supports 4 of varying lengths are frequently used by relatively unqualified personnel.

[0041] To prevent injuries, stacking safety devices 9 must be attached to these upper ends 8 of the corner supports before the upper transport trolley 1 is placed on the corner supports and can be supported there directly on the upper ends 8 of the corner supports 4, as before, for example in Fig. 4 is visible. Alternatively, the weight of the uppermost transport trolley 1 can also be supported indirectly via the intermediate stacking restraints 9, as in the embodiment shown in Figure 4. Fig. 5 is shown.

[0042] The stacking safety devices 9 can be placed on individual, multiple or, in particular, all corner supports 4.

[0043] The stacking safety devices 9 can each hold a lower area of ​​a sleeve profile 6 of the upper transport trolley 1 and an upper area 8 of a corner support 4 in a forced alignment and tilt-proof manner relative to each other.

[0044] In the exemplary embodiment according to Fig. 3 A stacking safety device 9, acting like a cuff, encompasses the lower end of a sleeve profile 6 of the upper transport trolley 1, at least substantially laterally, and likewise the upper end of a corner support 4, thus preventing the upper transport trolley 1 from tipping onto a corner support 4 of the lower transport trolley 1. In addition to preventing tipping, the device also provides a locking mechanism to prevent the support from being jammed between the lower tip formed by the tabs 7 and the upper end 8. Tolerances of different lengths of corner supports 4, for example, 20 to 30 millimeters, can also be compensated for. The gap that would otherwise arise above a corner support 4 that is too short is bridged and thus closed by the cuff of the stacking safety device 9.

[0045] Such stacking devices 9 are possible both during transport and storage - and can also be used between the various layers of a stack of transport trolleys 1: for example between a lower and a first upper layer and / or between a middle and a top layer.

[0046] The stacking device 9 is particularly dimensionally stable and can be made of stainless steel, for example. Other materials are also possible. If the stacking device 9 does not support the upper transport trolley 1, but only bears its own weight, a plastic version – possibly fiber-reinforced – is also an option.

[0047] These stacking devices 9 can be detached from the upper and lower transport trolleys 1 without tools and may have a slight overlap of a few millimeters with the corner support 4 onto which they are placed. This allows, for example, a truck driver to carry a large number of these stacking devices 9 and simply place them onto the corner supports as needed. Alternatively, a pre-assembled unit consisting of a corner support 4 and a stacking device 9 is also possible; the stacking device 9 can be permanently connected to the corner support 4 or be connectable to it.

[0048] Such stacking devices 9 can therefore also be traded and transported separately and without the transport trolleys 1 and are also claimed separately here.

[0049] The stacking safety device 9, for example, has a longitudinal extent L of 120 to 160 millimeters, in particular 140 millimeters. The clear inner width W is, for example, 45 millimeters, with the outline being at least nearly square.

[0050] The stacking safety device 9 can be placed on the upper, open end of a corner support 4. To prevent the stacking safety device 9 from slipping downwards on the corner support 4, the stacking safety device 9 has at least one securing projection 10 with which it can be supported on its upper end 8.

[0051] Such a securing element 10 can, for example, be formed by one or more punched-out and inwardly bent retaining tongue(s). In Fig. Figure 4 ff. shows a solution in which the securing element 10 is formed by one or more webs 11, which are, for example, welded to the cuff-like outer shell of the stacking safety device 9 and which, in the assembled position, rest on the upper end 8 of a corner support 4. Here, two mutually parallel webs 11 are shown, arranged at a distance from each other, between which obliquely bent ends or tabs 7 of a lower end of a sleeve profile 6 of an upper transport trolley 1 can engage.

[0052] The stacking safety device 9 according to the Fig. 3 and Fig. 4 is designed as a cuff or sleeve and, in its assembled position, encompasses both the upper end 8 of a corner support 4 and the lower end of a sleeve profile 6 on the outside. Ideally, the sleeve-like body is thin-walled with a wall thickness of less than 1.5 millimeters. Since three such transport trolleys 1 are frequently stacked side by side in a truck (two lengthwise, one crosswise), the total increase in width is 9 millimeters when all six corner supports 4 of a transverse line are equipped with such stacking devices 9. Because there is 10 millimeters of space to the sides in a standard truck with such a load, the load density does not need to be reduced even with the stacking devices 9 installed.

[0053] The support frame typically comprises 5 horizontal profiles 5a connected to the sleeve profiles 6. At least part of the connection area is stiffened by a vertical web 12, with these stiffening webs or nodes 12 projecting downwards from the horizontal profiles 5a, usually with a height H of approximately 23 to 25 millimeters. Such nodes 12 are usually only assigned to the longest horizontal profiles 5a of the support frames 5. In these cases, the support frames 5 have a length of more than one meter, for example. Specifically, such a transport cart 1 is 1.35 meters long and 56.5 centimeters wide.

[0054] It is therefore particularly advantageous if – as in Fig. 3 or Fig. 6 is clearly visible - the stacking safety devices 9 each have at least one recess 13 in their upper areas, into which the stiffening web 12 of the upper transport trolley 1 engages in the assembled position ( Fig. 3).

[0055] The recess 13 is designed in particular as a vertical slot recess, so that the weakening of the stack securing 9 remains low.

[0056] If the stacking safety device 9 comprises an easily cut-to-length square profile as the outer sleeve body 17, it is very advantageous if such a recess 13 is provided in at least two diagonally opposite upper corner areas ( Fig. 6) In the assembled position, for example, only one of the two recesses 13 is functional; however, a single type of stacking safety device 9 is sufficient. If the recess is as shown in Fig. If the recess 13 penetrates exactly one corner region of the square profile and extends axially symmetrically to both sides of the corner region, then only one recess 13 may suffice to cover all application points. Without this axial symmetry, i.e., if the recess 13 extends further into the front surfaces 15, 16, then both opposing recesses 13 may be required to cover all orientations.

[0057] With this single embodiment, the stacking device can be arranged in different orientations around a longitudinal axis 14 (rotated by 90° each time), either in a "right" corner of the long side of the transport trolley or in a "left" corner of the long side of the transport trolley 1, in which the stiffening node 12 points to the left in the first case and to the right in the second. This allows such a web 12 to engage in a recess 13 in each case, so that the upper edge of the stacking device 9 has no or only a minimal distance (for example, one to three millimeters) from the horizontal profile 5a of the upper transport trolley 1. The upper transport trolley 1 does not need to be supported on the sleeve of the stacking device 9; the latter can have slight play. To facilitate assembly, the front surfaces 15, 16 of the sleeve body 17, offset by 90° from each other, can have different markings, for example, different colors.When viewed from any side, the stack always shows a front surface 15 of one color on the left and a front surface 16 of the other color on the right. The assembly is correct when these two colors 15 and 16 are always visible.

[0058] In the version after Fig. 5 is not a continuous sleeve body 17 extending over the entire longitudinal extent at the stacking safety device 9, but rather insertion projections 18 are provided in the lower area, which can be inserted into the upper end 8 of a corner support 4. Other geometric solutions are also possible. Reference symbol list: 1 transport trolley (container), 2 rolls, 3 Floor area, 4 Corner supports (beams), 5 support frames, 5a horizontal profiles, 6 sleeve profiles, 7 tabs, 8 upper ends, 9 stack securing devices, 10 Security approach, 11 bridge(s), 12 stiffening webs (nodes), 13 Exclusion, 14 Longitudinal axis, 15 first front surface, 16 second front surface, 17 shell bodies, 17a Square profile, 18 insertion points, L Length of the stacking safety device, H Height of the footbridge, W Clear width

Claims

[1] Stackable transport trolley (1) with a support frame (5) which has sleeve profiles (6) in corner areas into or onto which upwardly projecting corner supports (4) can be inserted or attached, by the interaction of which with lower areas of sleeve profiles (6) of another transport trolley (1) the latter can be supported, characterized by, that the transport trolley (1) is assigned stacking safety devices (9) which are freely movable from the transport trolleys and which each form a sleeve body (17; 17a) at at least one axial end, in the area of ​​the upper ends (8) of the corner supports (4), which each hold a lower area of ​​a sleeve profile (6) of the upper transport trolley (1) and an upper area (8) of a corner support (4) in a forced alignment and tilt-proof manner relative to each other, wherein the stacking safety device (9) can be released without tools relative to the upper and lower transport trolley (1) and has at least one locking projection (10) which prevents the stacking safety device (9) from sliding downwards on the corner support (4). [2] Stackable transport trolley (1) with a support frame (5) which has sleeve profiles (6) in corner areas into which upwardly projecting corner supports (4) can be inserted or attached, the interaction of which with lower areas of sleeve profiles (6) of another transport trolley (1) allows the latter to be supported, characterized by, that the transport trolley (1) is assigned stacking safety devices (9) which are freely movable from the transport trolleys and which each form a sleeve body (17;17a) at at least one axial end, in the area of ​​the upper ends (8) of the corner supports, wherein a stacking safety device (9) encompasses the lower end of a sleeve profile (6) of the upper transport trolley (1) at least substantially laterally and holds it in a tilt-proof manner relative to a corner support (4) of the lower transport trolley (1), wherein the stacking safety device (9) can be released without tools relative to the upper and lower transport trolley (1) and has at least one locking projection (10) which prevents the stacking safety device (9) from sliding downwards on the corner support (4). [3] Transport cart (1) according to one of claims 1 or 2, characterized by , that each of the corner supports (4) of a lower transport trolley (1) can be provided with a stacking safety device (9). [4] Transport trolley (1) according to one of claims 1 to 3, characterized by, that the stacking safety device (9) is dimensionally stable in itself. [5] Transport trolley (1) according to any one of claims 1 to 4, characterized by , that the stacking safety device can be placed on an upper, open end (8) of a corner support (4). [6] Transport cart (1) according to any one of the preceding claims, characterized by , that the locking element (10) is formed by one or more punched-out and inwardly bent retaining tongue(s). [7] Transport trolley (1) according to any one of claims 1 to 5, characterized by , that the securing element (10) is formed by one or more webs (11) which, in the assembled position, rest on the upper end of a corner support (4). [8] Transport cart (1) according to claim 7, characterized by, that as a securing element (10) two webs (11) are provided which are spaced apart from each other and can engage between the obliquely bent ends (7) of a lower end of a sleeve profile (6) of an upper transport trolley (1). [9] Transport cart (1) according to any one of claims 1 to 8, characterized by , that the stacking safety device (9) is essentially designed in a sleeve-like form (17) and, in the assembled position, encompasses both the upper end (8) of a corner support (4) and the lower end of a sleeve profile (6) on the outside. [10] Transport cart (1) according to any one of claims 1 to 9, characterized by , that the supporting frame (5) comprises horizontal profiles (5a) which are connected to the sleeve profiles (6), wherein at least part of the connection areas is stiffened by a vertical web (12) and wherein these webs (12) project downwards relative to the profiles (5a). [11] Transport cart (1) according to claim 10, characterized by, that the stacking safety devices (9) each have at least one recess (13) in their upper areas into which, in the assembled position, the web (12) of the upper transport trolley (1) engages. [12] Transport cart (1) according to claim 11, characterized by , that the recess (13) is designed as a vertical slot recess. [13] Transport cart (1) according to one of claims 11 or 12, characterized by , that the stack securing device (9) comprises a cuff-like square profile (17; 17a) and that at least in two diagonally opposite upper corner areas such a recess (13) is provided. [14] Stacking device (9) for connecting several stackable transport trolleys, characterized by, that the stacking safety device (9) forms at least at one axial end a sleeve body (17;17a) whose clear inner width (W) is at least 40 millimeters and whose length (L) is at least 120 millimeters and which has at least one securing projection (10) extending into its interior, which stops an overrunning movement onto a body (4) that can penetrate into the interior, wherein the stacking safety device is a retrofittable individual part that is freely movable from the transport trolleys, which has a maximum edge length of 150 mm, whose sleeve body (17; 17a) forms a square profile in cross-section and has at least one recess (13) located in its corner region at an axially outwardly pointing end. [15] Stacking device (9) for connecting several stackable transport trolleys, which is freely movable from the transport trolleys, characterized by, that the stacking safety device (9) forms at least at one axial end a sleeve body (17;17a) which has inside at least one locking projection (10) extending into its interior, which stops an overrunning movement onto a body (4) that can penetrate into the interior, wherein when the stacking safety device is placed on the penetrable body (4) the at least one locking projection (10) automatically engages. [16] Stacking device (9) for connecting several stackable transport trolleys, which is freely movable from the transport trolleys, characterized by, that the stacking safety device (9) forms at least at one axial end a sleeve body (17;17a) which has inside at least one safety projection (10) extending into its interior, which stops an overrunning movement onto a body (4) that can penetrate into the interior, wherein the safety projection (10) is formed by one or more webs which, in the assembled position, rest on the upper end of a corner support of the transport trolley as a penetrable body (4).

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