EP3127829B1 - Stackable container with centring aids - Google Patents

Description

The present invention relates to a stackable container according to the preamble of claim 1. More particularly, the invention relates to a stackable container with a bottom and with each other and with the bottom (fixed, hinged and / or detachable) connected side walls, wherein the side walls a flat or ground parallel upper stack edge and the container has on its underside between side walls and bottom a step with a lower ground support surface, so that when stacking the same or compatible container, the bottom of the side walls rests on the upper stacking edge of the container stacked underneath and the bottom in the container opening of the underneath immersed stacked container.

Background of the invention

Generic container, which are suitable for transporting and storing goods, can be stacked to save space with identical or compatible containers on top of each other. In order for the stacked containers do not slip laterally or even fall down, they are designed so that the upper container with the bottom or a portion of its underside immersed in the opening of the underlying container or the lower container with upper side wall portions of the upper container at his Underside underside or otherwise enter into a lateral form-fitting both containers otherwise. The interaction of the corresponding stacking edges or protrusions is designed so that they allow only little lateral play in all lateral directions.

However, such containers are stacked not only in the static or unmoving state, but are often transported in the stacked state, for. B. in a truck, using industrial trucks or in a logistics center on a roller or belt conveyor. Especially in the latter case has become shown that in the range of conveying line transfers or oblique conveyor lines of the container stack is shaken so that one or more upper container can jump, ie briefly raised, often also slip sideways, so that this slips laterally with the bottom support surface over the edge of the lower Put on container. The then slightly staggered and slightly tilted container are no longer stacked so stable, which in the worst case can lead to the entire stack of containers can tip over at the next shock or vibration.

The US 2014/0097186 A1 discloses a container having a step on its underside. The NL 7 607 595 A discloses a container according to the preamble of claim 1. DE 85 11 564 U discloses a stackable container with a separately inserted upwardly curved bottom.

Thus, the object of the present invention is to provide a stackable container which remain centered and stacked on its own, even in the case of shocks and vibrations.

Summary of the Invention This object is achieved by a stackable container having the features of claim 1. Advantageous developments are the subject of dependent claims.

The stackable container according to the invention, which is suitable for storing and transporting, in particular in the context of a roller or belt conveyor in a logistics center, has a bottom, in particular a rectangular bottom, and, in particular four, with each other and with the ground fixed, articulated and / or detachably connected side walls. The side walls in this case have a, preferably encircling, flat or bottom parallel upper stack edge and the container has on its underside between side walls and bottom a, preferably encircling, step with a lower ground support surface, so that when stacking the same or compatible container the (for Stack edge parallel) undersides of the sidewalls rest on the upper stacking edge of the container stacked below and the bottom into the container opening of the stacked below Immersed container. According to the invention, the upper stack edge has an angled inner edge or insertion bevel or centering aid at least in sections, preferably circumferentially, and the step provided on the underside of the base between the side walls and the bottom is chamfered at least in sections, preferably circumferentially, or also has one sloping edge, which also acts centering. In the plan view, the projection surfaces of the inner edge and the step overlap. The inner edge angle of the upper stack edge is steeper, preferably substantially steeper, (with respect to the container horizontal plane or bottom plane) than the helix angle of the step at the bottom bottom side.

The invention is thus in the interaction of the two angles at the top and bottom of the container or in the interaction of the two centering at the top and bottom of the container. When the upper inner edge and the lower outer edge of the container are chamfered, the lateral tolerance range of two stacked containers increases. However, if the two bevels or centering each have a relatively shallow angle, this results in a greater lateral play, however, it may be that with flat bevels or edges of the upper container, when it pops out, due to friction does not slip back into the lower container but that the upper container with its flat bottom edge on the flat upper side wall inner edge can remain placed. If, however, the edges are formed relatively steep both on the inner edge of the side walls and on the outer edge of the soil, this ensures that, when the upper container pops out, the stacked containers do not lie on the steep edges and the upper container with Safety slips into the lower container. Steep edges, however, have comparatively a very small lateral tolerance range, so that it can happen at steep edges that the upper container so far or jump to the side, that the upper container outside the bevels or centering with the ground on the edge of the lower Container sets and thus the Zentrierschrägen be ineffective. If the inner edge angle is made flat and the bottom edge is steep, this may cause the upper container to be much more easily removed from the lower container and can jump to the side and due to the flat inner edge due to friction comes to rest. However, when angular ratios as defined in claim 1 are selected, ie, steep inner edge angles and flat bottom outer edges, the steeper inner edge angle of the lower container ensures that the upper container is less likely to jump out of the lower container and if it does , due to the steep edges (or low adhesion) also slips back into the lower container. However, since the bottom edge of the floor has a shallower angle, this increases the lateral (tolerance) range by which the top box can be moved to the side and still slip back into the bottom box.

Thus, the container according to the invention is ideal for transporting goods in the stacked state, be it with a vehicle such. Example, a truck in which the cargo is also exposed to vibrations, or as part of a conveyor in a logistics center, eg. B. in the range of switches or stages in the conveyor line. Thus, the stack of stacked containers according to the invention automatically aligns itself, even in the case of vibrations, or centers itself, so that the container stack remains securely stacked on top of one another. It can be dispensed with any additional centering, be it manually or with certain provisions.

The fact that overlap in the plan view, the projection of the inner edge and the step, it is ensured that when briefly raising or jumping the upper container, the two oblique edges cooperate and let the upper container slide back in or center.

According to one aspect of the invention, the inner edge angle with respect to a container horizontal plane or the stack edge may be in a range between 60 and 80 °, preferably between 65 and 75 °. An angle of 70 ° has proven to be particularly advantageous.

The helix angle at the container bottom, more precisely at the step between side wall and floor or ground support surface can according to one aspect with respect to a container horizontal plane or with respect to the bottom in a range between 30 and 50 °, preferably between 35 and 45 °. An angle of 40 ° has proven to be particularly advantageous.

Especially the combination or the interaction of an inner edge angle of 70 ° and a helix angle of 40 ° has been found to be particularly positive in terms of lateral play and the centerability of two stacked containers.

According to one aspect of the invention, the inner edge angle of the upper stack edge may be steeper than the skew angle of the step at the bottom bottom by at least 20 °, preferably at least 25 ° with respect to a container horizontal plane. It has been found that the interaction of the angles at the top and bottom of the container with a difference of 25 ° gives the best results.

According to one aspect of the invention, in the stacked state of two identical containers, the step of the upper container and the inner edge of the lower container at least partially contact one another in the lateral direction or lie laterally against one another. This ensures that the stacked containers have little or no lateral play when the top is not being extracted from the bottom container.

According to one aspect of the invention, in the stacked state of two identical containers, the step of the upper container and the inner edge of the lower container limit the degree of freedom in the lateral direction of the two containers relative to one another.

According to one aspect, in a side view of two identical containers stacked one above the other, the projection surface of the inner edge of the lower container and the projection surface of the step of the upper container overlap. Preferably, the projection surface of the step of the upper container within the projection surface of the inner edge of the lower container. This ensures that the upper container slips so far or centered until the bottom edge of the side wall and the top of the side wall lie on each other and the oblique edges touch only laterally and no longer absorb vertical loads.

According to one aspect of the invention can be provided in a known manner, a separate, fit into the container and loosely usable base plate which can be raised and lowered in a further development on a plurality of recesses in the container bottom with respect to the container bottom, z. B. by means of engaging from below pins of a lifting device. As a result, in the context of a conveyor system, the material stored on the base plate can be lifted out of the container and pushed over the side wall edge to the side.

According to one aspect, the container bottom in the region of the recesses may have an encircling edge or a corresponding edge projecting from the container surface. It is thereby achieved that via the recesses in the container bottom no (leaked) liquids can leak, but are retained by the edge of the recesses in the container bottom. This prevents the storage room or the conveyor on which the container is located from being contaminated by (leaked) liquid.

According to one aspect, the bottom plate can have at least on one side or at least on the side facing the container bottom a multiplicity of, preferably conical, recesses for receiving lifting pins which reach through the recesses in the container bottom. This ensures that the lifting pins do not slippage laterally from the bottom plate when lifting the bottom plate, but are held positively in these recesses. Thereby, the bottom plate can be held within the lateral dimensions of the container, even if the bottom plate is lifted by means of the lifting pins on the upper edge of the side walls, for example, to push the cargo or quality of the bottom plate to the side.

According to one aspect of the invention, the bottom plate at least on one side or at least on the container bottom facing side have a plurality of projections on which the bottom plate rests on the container bottom surface. As a result, a flat contact between the bottom plate and the bottom surface is prevented, since such can lead to jamming or adhesions of the bottom plate to the bottom surface.

According to one aspect of the invention, one or more ramp-shaped or inclined sections for centering the bottom plate in the container interior may be provided on the inside between side walls and bottom. About this provided in the inner edge portions between the side wall and floor ramp, the bottom plate is centered inside the container. Furthermore, it is ensured that the bottom plate does not jam inside the container and can be easily lifted.

• Fig. 1 zeigt einen erfindungsgemäßen Behälter in einer perspektivischen Ansicht von oben,
• Fig. 2 zeigt den erfindungsgemäßen Behälter in einer perspektivischen Ansicht von unten,
• Fig. 3 zeigt eine perspektivische Ansicht einer Unterseite einer Bodenplatte, die in den erfindungsgemäßen Behälter eingelegt werden kann,
• Fig. 4 zeigt eine perspektivische Ansicht des erfindungsgemäßen Behälters mit eingelegter Bodenplatte von oben,
• Fig. 5 zeigt eine Teilschnittansicht von zwei übereinander gestapelten erfindungsgemäßen Behältern,
• Fig. 6 zeigt eine Detailansicht eines Auflagebereichs von zwei aufeinander gestapelten erfindungsgemäßen Behältern in einem ersten Transportzustand,
• Fig. 7 zeigt eine Detailansicht eines Auflagebereichs von zwei aufeinander gestapelten erfindungsgemäßen Behältern in einem zweiten Transportzustand,
• Fig. 8 zeigt eine Schnittansicht von zwei aufeinander gestapelten erfindungsgemäßen Behältern in dem zweiten Transportzustand und
• Fig. 9 zeigt eine Teilschnittansicht eines erfindungsgemäßen Behälters mit eingelegter Bodenplatte.

The invention will be explained in detail below with reference to attached figures.

• Fig. 1 shows a container according to the invention in a perspective view from above,
• Fig. 2 shows the container according to the invention in a perspective view from below,
• Fig. 3 shows a perspective view of an underside of a bottom plate, which can be inserted into the container according to the invention,
• Fig. 4 shows a perspective view of the container according to the invention with inserted bottom plate from above,
• Fig. 5 shows a partial sectional view of two stacked containers according to the invention,
• Fig. 6 shows a detailed view of a support region of two containers stacked on top of one another according to the invention in a first transport state,
• Fig. 7 shows a detailed view of a support area of two containers according to the invention stacked on one another in a second transport state,
• Fig. 8 shows a sectional view of two stacked containers according to the invention in the second transport state and
• Fig. 9 shows a partial sectional view of a container according to the invention with inserted bottom plate.

Detailed Description of a Preferred Embodiment

The figures are merely schematic in nature and are for the sole purpose of understanding the invention.

In Fig. 1 an inventive container 2 is shown in a perspective view from above. The container 2 has a rectangular bottom 4 and four of the bottom 4 vertically rising and interconnected side walls 6, in particular two opposite longitudinal side walls 8 and two opposing transverse side walls 10, which together with the bottom 4 enclosing a container interior 12. The container has a circumferential upper stack edge 14, which forms a horizontal plane which is formed parallel to the bottom 4 of the container 2. At the side of the four side walls 6 facing the container interior 12, the upper stacking edge 14 initially merges into an angled inner edge section 16 and thus has a circumferential angled inner edge 16. Only after this angled inner edge portion 16 is a transition to the vertical or perpendicular to the ground aligned longitudinal side walls 8 and transverse side walls 10th

The bottom 4 of the container 2 has, at a bottom region adjacent to and along the longitudinal side wall 8, five recesses in the form of circular holes 18, which are uniformly spaced over the length of the container 2. In this case, of the five recesses or circular holes 18, two holes are provided in a region on the container corners and a hole 18 in a central region of the longitudinal side wall 8. The remaining two holes 18 are arranged between these three holes 18 and evenly spaced therefrom. At and along the opposite longitudinal side wall 8 are also five to these Recesses symmetrical recesses provided, however, in Fig. 1 are not visible.

The longitudinal side walls 8 have at their the container interior 12 facing sides between the longitudinal side wall 8 and the bottom 4 in a central region of the longitudinal side walls 8 each two ramped or wedge-shaped sections 20. The transverse side walls 10 are provided in the region of the side centers at their sides of the container 12 facing sides between the side wall 6 and the bottom 4, each with a ramped or wedge-shaped portion 20. The rampen or wedge-shaped sections 20 on the longitudinal side walls 8 and transverse side walls 10 are provided for a separate, in particular in Fig. 3 shown to center bottom plate 22 in the container interior 12.

The container 2 is integrally and inexpensively made of plastic, for example polyethylene, polypropylene, polyamide or another, in particular thermoplastic, plastic, preferably by injection molding.

In Fig. 2 the container 2 according to the invention is shown in a perspective view from below. Out Fig. 2 is particularly apparent from the corner areas and the central areas of the longitudinal side walls 8 that the longitudinal side walls 8 and transverse side walls 10 are each double-walled with inner side walls 24 and outer side walls 26 are executed. Sectionally, particularly in the areas between the corner regions and center regions of the longitudinal side walls 8 and transverse side walls 10, the inner side walls 24 and outer side walls 26 are connected to each other at their side wall bottoms and thus form side wall support surfaces 28. Between the side wall support surfaces 28 of the four side walls 6 and the bottom support surface 30, a, up to a central region of the longitudinal side walls 8, circumferential beveled step 32 is provided.

In the container 2 of Fig. 2 is already one, in Fig. 3 shown, separate bottom plate 22 is inserted, which is visible through the ten circular holes 18 in the bottom 4 of the container 2. Fig. 3 now shows a perspective view of the underside of this bottom plate 22, which is inserted into the container 2 according to the invention can be. The insertable bottom plate 22 has on its underside four larger trough-like regions 34 or recesses, which serve to save material or a stiffening of the bottom plate 22 and limit the contact surface area of the separate bottom plate 22. The bearing surface area is further reduced by the provision of projections or conical elevations 36 on the side wall underside outside the trough-like regions 34 or recesses. In the Fig. 3 shown bottom plate 22 is thus only on the projections or conical elevations 36 on the bottom 4 of the container 2. In each case, five conical elevations or projections 36 are provided along the transverse sides of the separate bottom plate 22, in each case five and along the longitudinal sides. In web-shaped center regions 38 of the separate bottom plate 22, a plurality of further projections 36, which serve as additional contact surface areas, are provided. Due to the protrusions 36, only small contact areas exist between the bottom plate 22 and the bottom 4, thereby preventing adhesion of the bottom plate 22 to the bottom 4.

The separate bottom plate 22 has on its underside also on and along the longitudinal side of the bottom plate five Bodenplattenausnehmungen 40 or depressions, so that a total of ten Bodenplattenausnehmungen 40 are provided on and along the two longitudinal sides of the bottom plate 22. The spacing and arrangement of the Bodenplattenausnehmungen 40 corresponds to the spacing and arrangement of the circular holes 18 and recesses in the container 2 of the invention Fig. 1 are provided. The four recesses or Bodenplattenausnehmungen 40, which are provided in the corner regions, in this case additionally have conical recesses 42, which for receiving lift pins 44, which are provided by the provided in the bottom 4 circular holes 18 which in Fig. 1 are shown, grab, are provided. On the peculiarities of these conical recesses 42 and their interaction with the lifting pins 44 is in Fig. 9 discussed in more detail.

In Fig. 4 the container 2 according to the invention with inserted separate bottom plate 22 is shown. In this case, the separate bottom plate 22 on its upper side a flat, flat shape and is prepared for receiving goods to be transported.

Fig. 5 shows an in Fig. 4 indicated sectional view IV-IV of two stacked containers according to the invention 2. Thus, in Fig. 5 a first upper container 2 is stacked on a second, lower container 2. Only one part of the container 2 according to the invention is shown in each case. Thus, in the sectional view, on the one hand, the bottom 4 of the container 2 is shown only partially, on the other hand only the connection of a transverse side wall 10 to the bottom 4 is shown. In Fig. 5 Once again it is clearer that the side wall 6 consists of an inner side wall 24 and an outer side wall 26. The inner side wall 24 and the outer side wall 26 are each connected at their upper side via an upper stack edge 14, which has the addressed angled inner edge 16. At the bottom, the containers 2 between the inner side wall 24 and the bottom 4 in each case the mentioned beveled step 32, so that a bottom support surface 30 is disposed lower than a side wall bottom side or side wall support surface 28. In this case, an angle (α = 70 °) from the inner edge 16 to the upper stacking edge 14 is in each case made steeper than a skew angle (β = 40 °) of the step 32 to the side wall bottom side or side wall support surface 28. The bottom 4 has the mentioned holes 18 or recesses and has in the region of the recesses 18 in each case one of the bottom 4 upwardly projecting edge 46 which is intended to prevent overflow of liquid collected in the bottom 4.

The side wall underside of the first, upper container 2 lies in Fig. 5 on the side wall top side or the upper stacking edge 14 of the second, lower container 2. The bottom 4 of the first upper container 2 dips into the container opening 48 of the second, lower container 2. In this case, the first, upper container 2 with the step 32 at the angled inner edge 16 of the second, lower container 2 laterally, so that thus the degree of freedom of the first upper container 2 by the interaction between the step 32 of the first, upper container 2 and the angled inner edge 16 of the second, lower container is limited. For this reason, the step 32 and the angled inner edge 16 in the container 2 provided such that the projection surfaces overlap downwards or upwards of the angled inner edge 16 and the step 32, wherein the projection surface of the inner edge 16 is arranged further outward than the projection surface of the step 32. Thus, the projection surface of the inner edge 16 of the second lower container 2 overlaps the projection surface of the step 32 of the first upper container 2 so that the first upper container 2 is suitably received in the second lower container 2. In particular, the edge height of the step 32 is smaller than the edge height of the inner edge 16 and the outer edge of the step 32 is located further inside than the upper edge of the angled inner edge sixteenth

Fig. 6 shows a detailed view of a support region of two stacked containers 2 according to the invention in a first transport state. This first transport state is an ideal transport state, in which the first, upper container 2 is arranged exactly in a position above the second, lower container 2. How out Fig. 6 As can be seen, the step 32 of the first, upper container 2 is not on the angled inner edge 16 of the second, lower container 2 in the ideal transport state, so that only the side wall bottom or side wall support surface 28 of the first, upper container 2 on the upper stack edge 14th of the second, lower container 2 comes to rest. However, if, during use in a transport or conveying system, slippage or jumping or hopping occurs with horizontal displacement of the first, upper container 2, the step 32 of the first, upper container 2 laterally contacts the angled inner edge 16 of the second, lower container 2, so that the first, upper container 2 at least partially no longer rests with its side wall bottom side or side wall support surface 28 on the upper stack edge 14 of the second lower container 2. Due to gravity, however, the first, upper container 2 then slips back into its intended ideal transport position, in particular from the Fig. 7 and 8th will emerge better.

The level 32 emerges as if Fig. 6 shows, in the ideal transport position entirely in the container opening 48, so that in the side view, a lateral projection of the step 32 is completely in the range of lateral projection of the angled inner edge 16. This results in a large lateral Tolerance range, so that in the case of a hopping of the first, upper container 2, a slipping back into the ideal transport state is automatically achieved even with an associated large horizontal offset of the first upper container 2.

In Fig. 7 is an enlarged view of the support area of two stacked containers according to the invention 2 shown in a second transport state. This second transport state is preceded by jumping with horizontal offset of the first, upper container 2 during transport. Due to this offset, in the second transport state, the side wall lower side or side wall support surface 28 of the first, upper container 2 no longer lies on the upper stack edge 14 of the second, lower container 2. As already mentioned, in this second transport state there is a sectional contact of the step 32 of the first, upper container with the angled inner edge 16 of the second, lower container 2, wherein the first, upper container 2 in this second undesired transport position again automatically or gravitationally due to slippage on the side wall inner edge or step 32 falls back into the first ideal transport position. In particular, as in Fig. 7 shown, a horizontal tolerance range is provided, in which the stage may be located to fall back as desired in the ideal first transport state.

The state of the second transport position is even clearer Fig. 8 showing a sectional view of the two stacked container 2 according to the invention in the second transport state. Here it is clear that the first, upper container 2, when it no longer rests with its side wall bottom side or side wall support surface 28 on the upper stacking edge 14 of the second, lower container 2, due to a jump with horizontal offset sections or on a side wall on the However, even if not over the entire intended support surface rests with its side wall bottom side 28 on the upper stacking edge 14 of the second, lower container 2 still opposite side. Due to gravity, in this case, the step 32 of the first, upper container 2 slips off again due to the selected angle on the angled inner edge 16 of the second, lower container 2, whereby a horizontal movement to the outside the opposite side is effected, so that after sliding back the side wall bottom side 28 rests again on the opposite side with the entire support surface provided on the upper stack edge 14 of the second, lower container 2 and the first, upper container 2 thus again in its first ideal Transport position is spent.

The in Fig. 7 and Fig. 8 described second transport state can also arise when the container 2 according to the invention is to be placed on an identical container 2 according to the invention, which is transported in a transport or conveyor system. In particular, the side wall lower side or side wall support surface 28 of the first, upper container 2 should come to rest on the upper stack edge 14 of the second, lower container 2. Since the container 2 according to the invention is used preferably or among other things in a transport or conveyor system, a precise placement of the side wall bottom side 28 of the first, upper container 2 on the upper stacking edge 14 of the second, lower container 2 can often not be guaranteed, so that it often comes in the intended use to a horizontal offset of the first, upper container 2 to the second, lower container 2. However, if the first upper container 2 according to the invention is placed slightly offset on the second, lower container 2, according to the invention the step 32 of the first, upper container 1 lies on the upper, rounded edge of the angled inner edge 16. Characterized in that according to the invention, the inner edge angle of the upper stack edge 14 is steeper than the helix angle of the step 32 on the side wall bottom 28, the first, upper container 2 in this case would gravitationally slip automatically into its intended position, whereby the stacking of the container 2 according to the invention in a large Dimensions are simplified.

In Fig. 9 is a partial sectional view of a container 2 according to the invention with inlaid bottom plate 22 is shown, in which case the interaction of the lifting pins 44 with the separate bottom plate 22 is clear. The lifting pins 44 engage, as in Fig. 3 has become apparent in four conical recesses 42 in the corner regions of the separate bottom plate 22 deep, so that with the help of the lifting pins 44, the bottom plate 22 can be raised and lowered. Now if the separate bottom plate 22 is raised via the lifting pins 44, for example, for removal of transported goods in a transport or conveyor system, the separate bottom plate 22 is not only raised via the lifting pins 44, but also supported laterally, so that a lateral sliding or slipping of the bottom plate 22 in raised state is avoided in any case and there is also no tilting of the plate. A lifting and lowering of the separate bottom plate 22 is often carried out in the context of a transport or conveyor system for receiving and removal of goods to be transported.

LIST OF REFERENCE NUMBERS

2

container

4

ground

6

Side wall

8th

Longitudinal side wall

10

Transverse side wall

12

tank interior

14

Upper stack edge

16

Angled inner edge

18

Circular hole

20

Ramp-shaped section

22

Separate base plate

24

Inner sidewall

26

Outer side wall

28

Side wall support surface, base

30

Bottom support surface

32

Beveled step

34

Tub-like area

36

Projection, conical elevation

38

Bridge-like mid-range

40

Bodenplattenausnehmungen

42

Conical recess

44

lift pin

46

Outstanding edge

48

container opening

Claims (11)

1. Stackable container (2) with a base (4) and, in particular four side walls (6) under one another and connected to the base (4), wherein the side wall (6) has an upper stacking edge (14) that is preferably circumferential, flat or parallel to the base and the container (2) has at its underside between sides walls (6) and base (4) a preferably circumferential step (32) with a base contact surface (30) arranged deeply such that when identical or compact containers (2) are stacked on top of each other, the base (4) dips into the container opening (48) of the container (2) stacked therebelow; wherein the upper stacking edge (14) also has, at least in sections, preferably circumferentially, an inner edge (16) angled at an inner edge angle (α) as a lead-in chamfer and the step (32) is chamfered between side walls (6) and base (4) at least in sections, preferably circumferentially, at a helix angle (β); and wherein in plan view the projection surfaces of the inner edge (16) and the step (32) overlap, characterised in that the inner edge angle (α) of the upper stacking edge (14) is steeper than the helix angle (β) of the step (32) at the base underside.
2. Stackable container (2) according to claim 1, characterised in that the inner edge angle (α) in relation to a container horizontal plane or the stacking edge (14) is in a range between 60° and 80°, preferably between 65° and 75°, particularly preferably 70°; and/or the helix angle (β) in relation to a container horizontal plane or the base (4) is in a range between 30° and 50°, preferably between 35° and 45°, particularly preferably 40°.
3. Stackable container (2) according to any one of the preceding claims, characterised in that the inner edge angle (α) of the upper stacking edge (14) is steeper by at least 25° in relation to a container horizontal plane than the helix angle (β) of the step (32) at the base underside.
4. Stackable container (2) according to any one of the preceding claims, characterised in that in the stacked state of two structurally-identical containers (2), the step (32) of the upper container (2) and the inner edge (16) of the lower container (2) contact each other laterally at least in sections.
5. Stackable container (2) according to any one of the preceding claims, characterised in that in the stacked state of two structurally-identical containers (2), the degree of freedom of the upper container (2) is defined by the interaction between the step (32) of the upper container (2) and the inner edge (16) of the lower container (2).
6. Stackable container (2) according to any one of the preceding claims, characterised in that in a side view of two structurally-identical containers (2) stacked on top of each other, the projection surface of the inner edge (16) of the lower container (2) and the projection surface of the step (32) of the upper container (2) overlap, preferably the projection surface of the step (32) of the upper container (2) is located within the projection surface of the inner edge (16) of the lower container (2).
7. Stackable container (2) according to any one of the preceding claims, further characterised by a separate base plate (22) insertable exactly and loosely into the container (2) which can be raised via a plurality of recesses (18) in the container base (4) in relation to the container base (4).
8. Stackable container (2) according to claim 7, characterised in that the container base (4) in the region of the recesses (18) has a circumferential edge (46) protruding from the container base surface.
9. Stackable container (2) according to claim 7 or 8, characterised in that the base plate (22) has, at least on one side or at least on the side facing the container base (4), a plurality of preferably conical depressions (42) to receive lifting pins (44) reaching into the container base (4) through the recesses (18).
10. Stackable container (2) according to any one of claims 7 to 9, characterised in that the base plate (22) has, at least on one side or at least on the side facing the container base (4), a plurality of protrusions (36), on which the base plate (22) rests on the container base surface.
11. Stackable container (2) according to any one of claims 7 to 10, characterised in that one or a plurality of ramp-shaped or inclined sections (20) are provided on the inside between side walls (6) and base (4) to centre the base plate (22) in the container interior.

Images