Transport trolley system with stacking protection

Abstract

The invention relates to a transport trolley system for a transport trolley composed of modular elements, in particular for a transport trolley for transporting plants, with at least one first transport floor, at least one further modular element and at least one stacking safety device, wherein a plurality of support sleeves are arranged on the first transport floor, in particular perpendicular to the plane of the first transport floor, of which at least one first sleeve has a clear cross-section with a cross-sectional constriction and the cross-sectional constriction can be engaged from behind by an opening in the first sleeve, wherein the at least one further modular element has at least one second sleeve, and wherein the stacking safety device interacts with the first sleeve of the first transport floor and the second sleeve of the further modular element.A functionally improved stacking lock of this transport trolley system is characterized in that it has a fastening insert and an extension piece connected thereto, wherein the stacking lock is anchored to the fastening insert in the first sleeve, wherein at least a part of the fastening insert engages behind the cross-sectional constriction, and wherein the extension piece connected to the fastening insert is designed to be inserted into the second sleeve.

Description

[0001] The present invention relates to a transport trolley system for a transport trolley composed of modular elements, in particular for a transport trolley for transporting plants, with at least one first transport floor, at least one further modular element and at least one stacking safety device, wherein a plurality of support sleeves are arranged on the first transport floor, in particular perpendicular to the plane of the first transport floor, of which at least one first sleeve has a clear cross-section with a cross-sectional constriction and the cross-sectional constriction can be engaged from behind by an opening in the first sleeve, wherein the at least one further modular element has at least one second sleeve, and wherein the stacking safety device interacts with the first sleeve of the first transport floor and the second sleeve of the further modular element.

[0002] Modular transport trolleys known as CC containers are used, for example, in commercial horticulture or the plant trade for the transport and storage of plants. They are widely used in Europe as reusable load carrier systems. Typically, such transport trolleys comprise a trolley equipped with transport rollers and a transport floor as a key modular element. Essentially vertical square hollow profiles are arranged in the four corners of the transport floor as support sleeves. They protrude above and below the transport floor, with the lower ends typically having a pyramid-like, tapered shape, with the side surfaces of the square hollow profiles being cut into triangular shapes at the lower ends and bent towards each other. However, the square hollow profiles are not closed at their lower ends.Depending on the container's design, posts can be inserted into the support sleeves as additional modular elements. Additional transport shelves for plants can be hung into the posts at variable heights.

[0003] In order to save space when transporting such trolleys, for example in a truck, or when storing them in a warehouse, they can be disassembled into their individual modular elements. This allows several trolleys to be stacked on top of each other. For this purpose, the pyramid-shaped lower ends of the support sleeves of one trolley are inserted into the upper ends of the support sleeves of a trolley below them. The problem with this, however, is that the lower end of a support sleeve may not fully engage with the support sleeve below it due to deformation caused by use or manufacturing tolerances. It can therefore happen that when force is applied, for example when transporting several trolleys stacked on top of each other over uneven ground or when a transport belt is tightened in a truck, a trolley and its support sleeve slip out of the support sleeve of the trolley below.The stack of trolleys can then shift or collapse, which not only can damage the trolleys themselves but also poses a significant hazard to surrounding people and property. This hazard increases the higher the stack of trolleys is.

[0004] The same problem arises when two or more CC containers, for example, are stacked on top of each other to form a kind of rolling shelving system with multiple shelves, used to transport plants. A trolley is inserted with the lower ends of its support sleeves into the upper ends of posts, which are inserted into the support sleeves of a trolley located below.

[0005] As a solution to this problem, a stacking safety device is known from EP 3 470 298 B1. The stacking safety device comprises a sleeve body that can be pushed onto the top of a post or the upper end of a support sleeve of a lower carriage and into which the lower end of a support sleeve of an upper carriage can be inserted. Shoulder surfaces are provided in the sleeve body as stops for the posts and / or support sleeves engaging in the sleeve body, and the stacking safety device circumferentially encloses both the upper end of the post or support sleeve of the lower carriage and the lower end of the support sleeve of the upper carriage.

[0006] DE 20 2005 013 047 U1 discloses a bearing device that is intended to have a reduced space requirement. For this purpose, a first centering means for interacting with the upper end of a support sleeve of another support platform and a second centering means for interacting with an upper end of a support rod that can be inserted between the support sleeves of two support platforms are formed at the lower end of the support sleeve of one support platform. Both centering means are firmly connected to the support sleeve, for example, by welding.

[0007] The object of the present invention is to provide a transport trolley system with a stacking safety device that is improved in its functionality.

[0008] This object is achieved with a transport trolley system of the type mentioned at the outset according to claim 1 in that the stack securing device has a fastening insert and an extension piece connected thereto, wherein the stack securing device is anchored in the first sleeve, wherein at least a part of the fastening insert engages behind the cross-sectional constriction, and wherein the extension piece connected to the fastening insert is designed to be inserted into the second sleeve.

[0009] The transport trolley system according to the invention serves for the construction and storage of a modular transport trolley such as a CC container and is preferably dimensioned for the transport of plants.

[0010] The first transport floor is provided with a plurality of support sleeves, which may or may not be designed like the support sleeves of the CC containers described above. In the pyramid-shaped, pointed lower ends of the support sleeves of conventional CC containers, which are all first sleeves in the present sense, the profile ends bent towards each other already form a cross-sectional constriction that can be gripped from behind by both the upper and lower ends of the sleeve. However, it is also conceivable, for example, that alternatively or in addition to this, an area with a narrowed clear cross-section is provided between the ends of the first sleeves, e.g. a bead running around the inner wall of the sleeve in a lower area of ​​the sleeve.In order to be able to engage behind the cross-sectional constriction, the sleeve is open at least at one end, preferably in the assembled state of a transport carriage of the transport carriage system according to the invention at a lower end and practically at an upper and lower end.

[0011] A stacking safety device can be anchored in a first sleeve of the system in a variety of ways. For example, the fastening insert and the extension piece can be connected to one another in such a way that the cross-sectional constriction of the first sleeve is clamped between the fastening insert and the extension piece. This is particularly suitable when the lower end of the first sleeve tapers to a pyramid shape, as is the case with the trolleys of conventional CC containers. The fastening insert then sits inside the sleeve on the tapered side surfaces of the sleeve profile and the extension piece rests on the outside of the sleeve end via connecting means. Alternatively, for example, in the case of a sleeve with an internally circumferential bead, it is conceivable to form the fastening insert from an elastomer with a cross-section that corresponds to the hollow cross-section of the sleeve and with a circumferential groove that corresponds to the shape of the bead.Such a fastening insert could be inserted into the sleeve and pushed over the bead until it sits in the groove of the fastening insert, and the fastening insert is secured by the bead against slipping out of the sleeve. Another alternative is to design the fastening insert in the manner of an expansion anchor, in which case an expandable part of the fastening insert, in the non-expanded state, is pushed through the area of ​​the cross-sectional constriction from an opening in the first sleeve and then expanded so that the fastening insert then engages behind the cross-sectional constriction.

[0012] The extension piece connected to the fastening insert can be designed such that, when inserted into the second sleeve of the additional module element, it provides particularly good securing of the stacked module elements. Thus, the outer cross-section of the extension piece can be adapted to the inner cross-section of the opening of the second sleeve into which it is to be inserted. Alternatively or additionally, the extension piece can be designed to be comparatively long, so that it engages deeply into the second sleeve.

[0013] The fastening insert and the extension piece of the stacking lock can be formed as a single piece. For example, the fastening insert and the extension piece can be made of a substantially dimensionally stable elastomer, whereby the elastomer must then be deformable enough for the fastening insert to be inserted into the first sleeve until it at least partially engages behind the cross-sectional constriction, thereby anchoring the fastening insert in the first sleeve.

[0014] Preferably, the stacking device with extension piece and fastening insert is designed in two parts, with the fastening insert and extension piece being detachably connected to each other. This makes it possible, for example, for the fastening insert to be inserted from an opening at one end of the first sleeve toward the cross-sectional constriction, while the extension piece can be placed against the cross-sectional constriction from the other end of the first sleeve, and both parts can then be connected to each other.

[0015] A simple connection between the fastening insert and the extension piece can be a screw connection, for example. As an alternative to this, a slatted element can be considered, which has a plurality of slats spaced apart in the longitudinal direction. The slatted element can in particular be designed as a slatted dowel. Furthermore, in this embodiment, the connecting means has a slatted receptacle that interacts with the slatted element and has a cross-section that can be expanded perpendicular to the longitudinal direction, so that a positive and / or non-positive connection can be formed or is formed between the slatted receptacle and the slatted element. In particular, two, preferably semicircular, expansion elements are arranged opposite one another in the opening.In principle, it does not matter whether the slat element is arranged on the fastening insert and the slat receptacle on the extension piece, or vice versa, the slat element on the extension piece and the slat receptacle on the fastening insert. In yet another embodiment, the connecting means comprises an at least partially elastically deformable locking element. In particular, the locking element has two hooks arranged opposite one another and spaced apart from one another perpendicular to the longitudinal direction, wherein the hooks can each have a bend or a groove that are oriented in opposite directions to one another. Furthermore, in this embodiment, the connecting means comprises a locking element receptacle such that the locking element can engage in the locking element receptacle and can engage and lock behind a wall of the locking element receptacle.In this embodiment, it is also irrelevant whether the locking element is provided on the fastening insert and the locking element holder on the extension piece or vice versa.

[0016] If the fastening insert and extension piece are detachable, the cross-section of the fastening insert can be adapted to the inner contour of the first sleeve and its shape is not limited by the size of the clear opening in the area of ​​the cross-sectional constriction. Furthermore, a fastening insert can be connected to a variety of different extension pieces, which can be adapted to the second sleeves of various additional module elements, for example, in terms of their length and / or cross-section.

[0017] Not all support sleeves of the first transport base need to have a cross-sectional constriction to accommodate a stack securing device; rather, a single support sleeve with a cross-sectional constriction is sufficient to achieve a securing effect. Irrespective of this, it is preferred if at least two and preferably all support sleeves are designed as first sleeves with a cross-sectional constriction.

[0018] Another module element worth mentioning here is a second transport floor, which can be essentially identical to the first. In this case, the stacking lock serves to stack individual transport floors, for example, when as many transport trolleys as possible are to be transported in a disassembled state to a plant producer. One or more second module elements can also be one or more posts, the upper ends of which are designed as sleeves and are, for example, part of a lower transport trolley onto which a transport floor is to be placed.

[0019] From the overall context, it's clear that the transport floors are sensibly equipped with transport rollers. However, this is not absolutely necessary for the functionality of the transport trolley system.

[0020] The stacking safety device of the transport trolley system according to the invention offers significant advantages over the previously known stacking safety device comprising a sleeve body. Firstly, it can be firmly connected to the first sleeve of a first transport base, so that it is not lost when dismantling a transport trolley. Secondly, because the stacking safety device is firmly connected to the first sleeve of a transport base, the end of the first sleeve, in which the stacking safety device is located, is protected against damage or wear caused by external influences. While repairs to damage to the first sleeve caused by external influences can be complex, damage that occurs instead to the stacking safety device can be repaired quickly and inexpensively by simply replacing the stacking safety device. Worn stacking sleeves are also easy to replace.

[0021] Another significant advantage is that it requires less space. For example, the previously known stacking safety device has a sleeve contour designed to accommodate both the lower end of a support sleeve and the upper end of a post. This means that the previously known stacking safety device projects laterally beyond the support sleeves located in the corners, thereby increasing the external dimensions of the CC container, not just at one corner, but at all four corners of the CC container. Since the dimensions of CC containers (without stacking safety devices) are tailored to the loading areas of vans, this regularly results in the problem that when transporting CC containers stacked using the previously known stacking safety devices in the loading space of a truck, either fewer CC containers can be carried, or they can only be forced into a loading space that is actually too small with great effort.This can cause damage to the CC containers, individual module elements of the CC containers in the cargo space, or even to the cargo space itself. In the transport trolley system according to the invention, however, the securing is not achieved by external wrapping, but rather from the inside, since the stacking protection is arranged at least substantially within the first and second sleeves.

[0022] In a preferred embodiment of the invention, the fastening insert is arranged entirely within the first sleeve and the extension piece is arranged entirely outside the first sleeve. This is the case, for example, when the transport floor is that of a trolley of a CC container whose support sleeves taper to a pyramidal point at the bottom. With these support sleeves, the fastening piece can be inserted into the support sleeve from above so that it rests on the pyramid-shaped end within the support sleeve. The extension piece is then attached from below to the lower pyramid-shaped end of the support sleeve, and the fastening insert and the extension piece can then be screwed together or connected in some other way.

[0023] In one embodiment, an outer contour of the fastening insert and an inner contour of the extension piece are configured to correspond to each other in such a way that the fastening insert can engage with the extension piece. This positive engagement prevents relative movement between the fastening insert and the extension piece.

[0024] In a further embodiment, at least one section of the fastening insert has an outer contour that essentially corresponds to an inner contour of the first sleeve in the region of the cross-sectional constriction and is preferably rectangular or square. This clearly defines the position of the fastening insert in the first sleeve, and once the stacking lock is anchored in the first sleeve, the fastening insert can no longer easily slip. If the outer contour is simultaneously triangular or polygonal and, in particular, square, as is the case with the support sleeves of conventional CC containers, the fastening insert is simultaneously secured against twisting about a longitudinal axis of the sleeve.

[0025] Preferably, the outer contour of the fastening insert tapers at least within a section in the direction of insertion, with the fastening insert preferably having the shape of a truncated pyramid at its front end in the direction of insertion. This makes the fastening insert particularly well-suited for use in support sleeves of conventional CC containers or containers with similar support sleeves. Due to the tapered contour, the fastening insert can self-center within the first sleeve during assembly if the first sleeve is suitably designed.

[0026] In one embodiment, the extension piece has an inner contour at its end facing the fastening insert, which essentially corresponds to at least part of an outer contour of the fastening insert and / or an end of the first sleeve facing the second sleeve. For example, if the inner contour corresponds to the counterpart of a truncated pyramid, its shape corresponds to the lower end of the support sleeve of the trolley of a conventional CC container. If the extension piece is connected to the fastening element anchored in the first sleeve and then rests positively against the underside of the first sleeve, it is secured against lateral slipping or twisting.

[0027] In a further embodiment, the extension piece, particularly in a first extension piece section, has an outer contour that tapers at least partially toward the insertion and / or engagement in the second sleeve, so that it self-centers upon insertion into a second sleeve of another module element and can possibly even wedge itself therein. Preferably, the extension piece in the first extension piece section has the shape of a truncated pyramid.

[0028] In a further embodiment of the transport trolley system according to the invention, the extension piece has a second extension piece section which is arranged downstream of the first extension piece section in the direction for insertion into the second sleeve. In particular, a maximum external dimension of the second extension piece section perpendicular to the longitudinal direction is smaller than a clear width of the second sleeve. In this way, the extension piece can engage even further into the second sleeve, so that it can be connected to it even more securely and, in particular, the risk of tipping of stacked transport trolleys (such as CC containers) or transport floors is further reduced. Preferably, the first extension piece section and the second extension piece section merge into one another. In particular, the extension piece in the second extension piece section has a consistent outer contour along the longitudinal direction.The outer contour of the extension piece section is essentially round, preferably circular, in a plane perpendicular to the longitudinal direction. However, other shapes are also conceivable, for example, rectangular or square. In particular, several longitudinally extending and spaced-apart grooves are formed on the outer contour of the second extension piece section. The grooves can serve to stabilize the shape of the extension piece in the second extension piece section and to improve its grip in the second sleeve.

[0029] In a further embodiment, the fastening insert has at least one elongated anti-tilt element. Preferably, the fastening insert has at least two anti-tilt elements, wherein the anti-tilt elements are arranged at a distance from one another, in particular perpendicular to an insertion direction of the fastening insert. The anti-tilt element protrudes from the fastening insert in or opposite to the insertion direction and is intended to prevent the fastening insert from tilting during insertion into the first sleeve before reaching an anchoring position, and then from being difficult to move into the desired position within the first sleeve. The anti-tilt element is preferably curved.

[0030] In a further embodiment of the transport trolley system according to the invention, the stacking safety device comprises a protective sleeve. The protective sleeve is provided to be fastened to the longitudinally upper end of the second sleeve and, in particular, to cover this end so that sharp edges or corners of the second sleeve, whether they are part of a support sleeve of a transport floor or a post, are covered and prevent people from injuring themselves. Preferably, an inner contour of a cavity in the protective sleeve and an outer contour of the extension piece are designed to correspond to one another in such a way that the extension piece can be inserted precisely into the protective sleeve. By inserting the extension piece into the protective sleeve, the extension piece can be connected even better to the second sleeve.

[0031] The protective sleeve can have an inner contour that tapers along the cavity in the direction of insertion of the extension piece into the protective sleeve. The tapered inner contour can, in particular, achieve an improved wedging and centering effect between the extension piece and the protective sleeve. Preferably, the protective sleeve has, at least partially, in particular completely, along its longitudinal extent, a rectangular, in particular square, outer contour and / or inner contour in a plane perpendicular to the longitudinal direction. In a further embodiment, at least one lamella, preferably a plurality of lamellas arranged at a distance from one another, is arranged on at least one outer wall of the protective sleeve, preferably on all outer walls of the protective sleeve. When the protective sleeve is fastened, the lamella serves to improve the hold between the outer wall and the second sleeve, so that the protective sleeve sits more securely in the second sleeve.In particular, the protective sleeve has a collar, in particular one that runs perpendicular to the longitudinal direction, with which it can rest against an opening in the second sleeve, in particular against an opening at an upper end of the second sleeve in the longitudinal direction, when inserted. The collar preferably forms a support surface with which it rests against the opening of the second sleeve. The protective sleeve can be fastened to the second sleeve, for example, by means of a press fit. However, it is also conceivable for the protective sleeve to be fastened by means of a fastening element, for example a screw and / or a rivet.

[0032] It can happen that stacked transport floors, especially those each containing more than one sleeve, do not stand securely on top of one another because at least one of the first and / or second sleeves has a different length in the longitudinal direction than the other sleeves. To solve this problem, the stack securing device in a further embodiment of the transport trolley system according to the invention can have a compensating means which serves precisely to compensate for any differences in length. The outer contour of the compensating means and the inner contour of the second sleeve and / or the protective sleeve are designed to correspond to one another in such a way that the compensating means can be inserted into the second sleeve and / or the protective sleeve. In particular, the compensating means has at least a first compensating means section and a second compensating means section spaced apart in a direction for insertion into the second sleeve and / or the protective sleeve.The compensating means can be inserted, in particular with the second compensating means section, preferably completely, into the second sleeve and / or the protective sleeve. Preferably, a collar is formed at a transition between the first compensating means section and the second compensating means section, with which collar the compensating means can rest against an opening in the second sleeve and / or the protective sleeve. In particular, the first compensating means section has a larger maximum external dimension in a plane perpendicular to the longitudinal direction than the second compensating means section. Preferably, the compensating means has a hollow space in the longitudinal direction, wherein an inner contour of the hollow space and an outer contour of the extension piece are designed to correspond to one another in such a way that the extension piece can be inserted into the hollow space.In particular, an inner contour of the cavity tapers in a direction for inserting the extension piece into the compensating element. This taper advantageously leads to a greater wedge effect and a more secure connection between the extension piece and the compensating element.

[0033] The fastening insert, the extension piece, the protective sleeve and / or the compensating means are preferably made of plastic.

[0034] In the following, the invention is explained in more detail with reference to figures in which preferred embodiments of the invention are shown.

[0035] It shows Fig. 1a and Fig. 1b a side view and a top view of a fastening insert of a stack securing device of a transport trolley system according to the invention; Fig. 2a and Fig. 2b a side view and a top view of an extension piece of a stacking lock of a transport trolley system according to the invention; Fig. 3a and Fig. 3b shows a longitudinal section and a plan view of a protective sleeve of a stacking device of a transport trolley system according to the invention; Fig. 4a and Fig. 4b Side views of parts of a transport trolley system according to the invention with stacking protection; Fig. 5a and Fig. 5b a side view of a fastening insert and a top view of a matching extension piece of a second embodiment of the stack securing device according to the invention; Fig. 6a and Fig. 6b a side view of a fastening insert and a plan view from below of a matching extension piece of a third embodiment of the stack securing device according to the invention; Fig. 7a and b two side views of a fastening insert with anti-tilt elements of a fourth embodiment of the stacking safety device according to the invention; Fig. 8a and b a side view and a plan view of a compensating means of a stack securing device of a transport trolley system according to the invention.

[0036] The Fig. 1a and Fig. 1b show a fastening insert 1 of a first embodiment of a stacking device of a transport trolley system according to the invention. As can be seen in particular from the Fig. 1a and Fig. 1b, the fastening insert 1 has the shape of a truncated pyramid with a square base and an outer contour that continuously tapers in the longitudinal direction L. As shown in Fig. As can be seen in Figure 1b, a nut 2 is arranged in the center of the top side of the fastening insert 1. The fastening insert 1 has a central through-hole so that a screw can be inserted into the fastening insert 1 from its underside 3 and screwed into the nut 2.

[0037] In the Fig. 2a and Fig. Figure 2b shows an extension piece 4 of the first embodiment of the stack securing device of the transport trolley system according to the invention. The extension piece 4 has a first extension piece section 5 and a second extension piece section 6 adjoining it in the longitudinal direction L. The extension piece 4 is designed as a hollow body. As can be seen particularly from the synopsis of the Fig. 2a and Fig. As can be seen in Figure 2b, the first extension piece section 5 has the outer contour of a truncated pyramid with a square base, tapering in the longitudinal direction L. The first extension piece section 5 defines a cavity 7 that is also truncated pyramid-shaped. The adjoining, longitudinally extending second extension piece section 6, in contrast, has a constant, square cross-section and a central through-hole 8 for a screw.

[0038] The Fig. 3a and Fig. 3b shows a protective sleeve 10 of a stacking device of a transport trolley system according to the invention. The protective sleeve 10 is a hollow body with a square cross-section and forms a continuous cavity 11 with a square cross-section that tapers slightly in the longitudinal direction L. Furthermore, the protective sleeve 10 has a circumferential, outwardly directed collar 14 at its rear end, as seen in the longitudinal direction L. On each of the four outer walls of the protective sleeve 10, four slats 15 are arranged one below the other and extend obliquely to a plane perpendicular to the longitudinal direction L.

[0039] The Fig. 4a and Fig. 4b show various sections of a transport trolley system according to the invention with stacking safety. Fig. 4a shows a corner section of a transport floor 16, which is essentially constructed like the corner section of a CC container carriage with a support sleeve running perpendicular to a plane of the transport floor 16, having a square cross-section and an internal clear width LW. At the lower end 19, the support sleeve tapers to a pyramid-like point, so that the internal cross-section of the support sleeve becomes narrower. The pyramid-like, tapered lower end 19 of the support sleeve thus forms a cross-sectional constriction, and the support sleeve is thus a first sleeve 17 according to the definition of the present invention.

[0040] On the lower end 19 of the first sleeve 17 there is a fastening insert 1 inserted into the first sleeve 17 from above, as shown in the Fig. 1a and Fig. 1b, and rests with its underside completely on the lower end 19 of the first sleeve 17. An extension piece 4 is attached from below to the lower end 19 of the first sleeve 17, wherein the lower end 19 of the first sleeve 17 is inserted into the cavity 7 of the first extension piece section 5. The extension piece 4 is firmly connected to the fastening insert 1 by a screw 18, which is passed from below through the extension piece 4 and the fastening insert 1 and screwed into the nut 2, wherein the lower end 19 of the first sleeve 17 lies between the fastening insert 1 and the extension piece 4 and the stack lock is anchored in the first sleeve 17. While the outer contour of the fastening insert 1 corresponds to the inner contour of the lower end 19 of the first sleeve 17, the outer contour of the extension piece 4 is less tapered.As a result, the stacking lock not only extends the lower end 19 of the first sleeve 17, but also changes the shape of the part that is to be inserted into the second sleeve of another module element for stacking. Particularly in the case where the extension piece is to be inserted directly into a second sleeve of another module element, which is a simple opening in an elongated hollow profile, this can also improve the wedging effect of the extension piece 4 seated in the second sleeve.

[0041] Fig. 4b shows in addition to the Fig. 4a shown elements in the Fig. 3a and Fig. 3b, which is inserted into the upper opening of a second sleeve 20 of the transport trolley system and rests with its collar 14 on the upper edge of the second sleeve 20. The second sleeve 20 can be the protective sleeve of another transport floor or a post whose upper side is designed as a sleeve and which is attached, for example, to another transport floor underneath. Fig. 4b further shows that the outer contour of the extension piece 4 and the inner contour of the cavity 11 of the protective sleeve 10 correspond to each other, so that an optimal hold of the extension piece 4 in the protective sleeve 10 is provided.

[0042] The Fig. 5a and Fig. 5b show the fastening insert 1 and the extension piece 4 with a connecting means in a second embodiment. As in Fig. 5a, the connecting means comprises a fastening dowel 22 arranged on the fastening insert 1, which has a total of five circumferential slats 23 spaced apart from one another in the longitudinal direction L. In Fig. 5b further shows that the connecting means further comprises an opening 24 formed in the second extension piece section 6 [A1], wherein two semicircular expansion elements 25 are provided in the opening 24. To connect the fastening insert 1 and the extension piece 4, the fastening dowel 22 is inserted through the opening 24, so that a force-fitting and form-fitting connection can be established between the fastening insert 1 and the extension piece 4.

[0043] The Fig. 6a and Fig. 6b show the fastening insert 1 and the extension piece 4 with a connecting means in a third embodiment. In Fig. 6a shows that the connecting means has two at least partially elastically deformable locking elements in the form of hooks 26. The hooks 26 are arranged perpendicular to the longitudinal direction L at a distance from one another on the fastening insert 1, so that they can be bent towards one another when a corresponding force is applied. Fig. 5b shows that the connecting means further comprises a wall 27 formed in the second extension piece section 6 [A2] with an opening 28. To connect the fastening insert 1 and the extension piece 4 to each other, the hooks 26 are inserted into the opening 28 so that they engage behind the wall 27 and a positive connection is established.

[0044] The Fig. 7a and Fig. 7b show the fastening insert 1 in an embodiment with two anti-tilt elements 29. As in Fig. As can be seen in Figure 7a, the two anti-tip elements 29 are arranged at a distance from each other perpendicular to the longitudinal direction L and are aligned slightly obliquely to the longitudinal direction L. In Fig. 7b shows that the anti-tilt elements 29 are curved. The anti-tilt elements 29 each have a length KL in the longitudinal direction L that is greater than the clear width LW of the first sleeve 17. The anti-tilt elements 29 prevent the fastening insert 1 from twisting in the insertion direction perpendicular to the longitudinal direction L when inserted into the first sleeve 17, so that it can be easily inserted in the Fig. 4 can be anchored in the first sleeve 17.

[0045] The Fig. 8a and Fig. 8b show a compensating means 30 of a stacking safety device of a transport trolley system according to the invention. In particular, in the context of Fig. 8a and Fig. 8b it is clear that the compensating means 30 is similar to the protective sleeve of the Fig. 3a and Fig. 3b has a square inner and outer contour perpendicular to the longitudinal direction L. As in Fig.8a, a cavity 31 is formed in the compensating means 30 in the longitudinal direction L. The inner contour of the cavity 31 is designed to correspond to the outer contour of an extension piece 4 such that the extension piece 4 can be inserted precisely into the cavity 31. Furthermore, the compensating means 30 has a first compensating means section 32 and a second compensating means section 33 spaced therefrom in the longitudinal direction L. The outer contour of the second compensating means section 33 corresponds to an inner contour of a second sleeve 20 or the cavity 11 of a protective sleeve 10, so that the compensating means 30 with the second compensating means section 33 can be inserted into a second sleeve 20 or the cavity 11 of a protective sleeve.At the transition between the first compensating means section 32 and the second compensating means section 33, a collar 34 is formed, with which the compensating means 30 can rest against the second sleeve 20 or the protective sleeve 10. List of reference symbols 1 mounting insert 2 mother 3 Bottom 4 extension pieces 5 first extension section 6 second extension section 7 Cavity 8 Opening 10 protective sleeve 11 Cavity 14 collars 15 slats 16 Transport floor 17 first sleeve 18 Screw 19 lower end 20 second sleeve 22 lamella dowels 23 slats 24 Opening 25 expansion elements 26 hooks 27 wall 28 Opening 29 anti-tip elements 30 compensatory measures 31 cavity 32 first compensatory section 33 second compensatory section 34 collar L longitudinal direction LW clear width KL Length of the anti-tip element

Claims

[1] Transport trolley system for a transport trolley composed of modular elements, in particular for a transport trolley for transporting plants, comprising at least one first transport floor (16), at least one further module element and at least one stacking safety device, wherein several support sleeves, in particular perpendicular to the plane of the first transport floor (16), are arranged on the first transport floor (16), at least one first sleeve (17) of which has a clear cross-section with a cross-sectional narrowing and the cross-sectional narrowing can be accessed from behind an opening of the first sleeve (17), wherein the at least one further module element has at least one second sleeve (20), and wherein the stacking safety device interacts with the first sleeve (17) of the first transport floor and the second sleeve (20) of the further module element, characterized by, that the stacking safety device has a fastening insert (1) and an extension piece (4) connected thereto, wherein the stacking safety device is anchored in the first sleeve (17), wherein at least a part of the fastening insert (1) engages behind the cross-sectional narrowing, and wherein the extension piece (4) connected to the fastening insert (1) is designed to be inserted into the second sleeve (20). [2] Transport trolley system according to claim 1, characterized by , that at least one of the further module elements is a further transport floor, wherein the further transport floor is preferably substantially identical to the first transport floor (16). [3] Transport trolley system according to claim 1 or 2, characterized by that the first transport platform has transport rollers. [4] Transport trolley system according to one of the preceding claims, characterized by, that at least one of the further module elements is a post which can be connected to the support sleeves of two transport floors (16). [5] Transport trolley system according to one of the preceding claims, characterized by , that an outer contour of the fastening insert (1) and an inner contour of the extension piece (4) are designed to correspond to each other in such a way that the fastening insert (1) can engage in the extension piece (4). [6] Transport trolley system according to one of the preceding claims, characterized by , that the fastening insert (1) has in at least one fastening insert section an outer contour which essentially corresponds to an inner contour of the first sleeve (17) in the area of ​​cross-sectional narrowing and is preferably triangular or polygonal and in particular square. [7] Transport trolley system according to claim 6, characterized by, that the outer contour of the fastening insert (1) tapers at least within a section in the direction of an insertion direction, wherein the fastening insert preferably has the shape of a truncated pyramid at its front end in the insertion direction. [8] Transport trolley system according to one of the preceding claims, characterized by , that the extension piece (4) has an inner contour at its end facing the fastening insert (1) which corresponds substantially to at least part of an outer contour of the fastening insert (1) and / or to an end (19) of the first sleeve (17) facing the second sleeve (20). [9] Transport trolley system according to one of the preceding claims, characterized by , that the extension piece (4) in a first extension piece section (5) has an outer contour which tapers at least partially in the direction of insertion into a second sleeve (20) and in particular has the shape of a truncated pyramid. [10] Transport trolley system according to one of the preceding claims, characterized by , that the extension piece (4) has a second extension piece section (6) which is arranged downstream of the first extension piece section (5) starting from the fastening insert (1) in the longitudinal direction (L) and whose maximum outer dimension perpendicular to the longitudinal direction (L) is less than a clear width (LW) of the second sleeve (20), wherein in the second extension piece section (6) it preferably has a constant outer contour along the longitudinal direction (L). [11] Transport trolley system according to one of the preceding claims, characterized by , that the fastening insert (1) has at least one elongated anti-tilt element (29) whose length (KL) is greater than a clear width (LW) of the first sleeve (17), wherein the anti-tilt element (29) is in particular curved. [12] Transport trolley system according to one of the preceding claims, characterized by, that a component of the stacking safety device has a protective sleeve (10) which is inserted into the second sleeve, wherein an inner contour of the protective sleeve (10) and an outer contour of the extension piece (4) are designed to correspond to each other in such a way that the extension piece (4) can be inserted into the protective sleeve (10). [13] Transport trolley system according to claim 12, characterized by that the protective sleeve (10) has a cavity (11) in a longitudinal direction (L). [14] Transport trolley system according to claim 12 or 13, characterized by , that at least one lamella (15) is arranged on at least one outer wall of the protective sleeve (10), in particular on all outer walls, wherein several lamellae (15) are arranged spaced apart from each other in the longitudinal direction (L) on the at least one outer wall. [15] Transport trolley system according to one of claims 12 to 14, characterized by, that the protective sleeve (10) can be inserted into the second sleeve (20), wherein the protective sleeve (10) has a collar (14) with which it can rest against an opening of the second sleeve (20) when inserted.

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