Tray for storage elevator

Abstract

The invention relates to a tray (1) for a storage elevator and to a method for producing a tray (1). In order to provide a tray (1) which has an increased load-bearing capacity and is compact and easy to produce, it is proposed according to the invention that the base (3) is plastically deformed at at least one point (19) which is spaced apart from the edge regions (12, 14).

Description

[0001] This application is a divisional application of the invention patent application with an application date of November 21, 2018, an entry date of the Chinese national phase on May 22, 2020, an application number of 201880075779.X, and an invention name of "Pallet for Storage Lift". Technical Field

[0002] The invention relates to a pallet for a storage lift, comprising a bottom for placing stored items. The invention also relates to a method for producing a pallet from a plate-shaped raw material. Background Art

[0003] Pallets for storage elevators are known. They are used to store goods in storage elevators and are usually accommodated removably in the storage elevator. A number of requirements apply to pallets. For one, they must have a sufficient load-bearing capacity for the stored goods. Furthermore, it is advantageous if the pallet occupies little structural space, particularly in the vertical direction, i.e., perpendicular to the base, so that multiple pallets can be placed one above the other in a storage elevator of a predetermined size. Summary of the Invention

[0004] Therefore, the object of the present invention is to provide a pallet for a storage elevator and a method for manufacturing such a pallet, which has a high load-bearing capacity and a compact structure. In addition, it is advantageous that the pallet is simple in construction or can be manufactured with as few manufacturing steps as possible.

[0005] With a pallet of the aforementioned type, this object is achieved in that the bottom is plastically deformed at at least one location spaced apart from the edge region, wherein in the at least one plastically deformed location the sheet-like material forming the bottom is pushed laterally so that the bottom is stretched in the longitudinal direction, causing the bottom to bulge upward in the vertical direction, as the bottom is prevented from expanding its area in the longitudinal direction and / or in the depth direction. With the method mentioned at the outset, this object is achieved in that the pallet is produced from sheet-like material, in particular from sheet material by forming, wherein the bottom of the pallet is plastically deformed at at least one location spaced apart from the edge region, wherein in the at least one plastically deformed location the sheet-like material forming the bottom is pushed laterally so that the bottom is stretched in the longitudinal direction, causing the bottom to bulge upward in the vertical direction, as the bottom is prevented from expanding its area in the longitudinal direction and / or in the depth direction.

[0006] The at least one plastically deformed portion can induce stress in the material of the bottom, particularly in the form of a sheet. This stress can, in turn, cause an upward bulge in the bottom, with the upward bulge being compared to a similar pallet without the at least one plastically deformed portion. In other words, without the at least one plastically deformed portion, the bottom of the pallet would sag downward under its own weight. However, with the at least one plastically deformed portion, the bottom of the pallet does not sag as much, or instead extends horizontally or bulges upward. Therefore, the introduction of the at least one plastically deformed portion creates a negative prestress in the bottom, or an upward bulge in the bottom, compared to a pallet without the at least one plastically deformed portion according to the present invention.

[0007] This indirect formation of a camber can be achieved by, for example, pushing the material of the bottom laterally, i.e., away from, at least one plastically deformable location. This pushing of the material can generate pressure in the bottom of the pallet, particularly laterally directed. Since pallets are typically defined up to their sides and these sides can be reinforced, the bottom can respond to the pressure generated by the plastic deformation by forming a camber.

[0008] By virtue of the upward bulge of the bottom, the pallet can be reversely pre-deformed, or reversely pre-stressed, in an unloaded state, i.e., in a state without stored items. If the pallet is now unloaded and the load acting on the bottom increases, the bottom bulges downward. Due to this upward reverse deformation, the downward bulge of the bottom is less than in the case of a similar pallet whose bottom does not have a portion that is plastically deformed according to the present invention. In other words, when the bottom is subjected to the load of stored items, the upward bulge is first overcome before the bottom bulges downward due to the weight of the stored items. This minimizes the downward bulge of the bottom. Therefore, compared to a pallet that does not have a portion that is plastically deformed according to the present invention, the bottom of the pallet according to the present invention bulges downward less under the same load. In this way, multiple pallets can be placed one above the other in a storage elevator with small vertical intervals. Since the downward bulge is reduced compared to conventional pallets, the pallet according to the present invention can accommodate more loads under the same space requirements.

[0009] The term "pallet bottom" refers to a horizontal, preferably continuous structure that delimits the storage area for the pallet's stored items downward. Here, the stored items are at least partially located on the bottom surface, which is accessible from above. In the method according to the present invention, the "bottom" refers to the area of ​​sheet-like material, particularly sheet, that will later form the pallet's bottom. The at least one location of plastic deformation according to the present invention differs from the aforementioned deformation of the pallet bottom caused by the plastic deformation location according to the present invention. While the at least one location of plastic deformation according to the present invention is locally limited in the pallet bottom, particularly in terms of its area, the area of ​​reverse prestressing or upward curvature involves a larger area of ​​the bottom and, depending on the design, can also occupy a large portion of the bottom. For the sake of brevity, the term "sheet" will be used below for "sheet-like material." The pallet, particularly the bottom, can be formed from sheet. Alternatively or additionally, the pallet can also be formed from multiple sheets. This also does not exclude the possibility that the finished pallet has other components, resulting in it being composed of multiple separate parts. For example, the pallet can also be provided with attached corner supports.

[0010] The design according to the invention can be further improved by various, individually advantageous, designs that can be combined with one another in any desired manner. These designs and the advantages associated therewith are discussed in detail below. The design according to the invention can be produced using the method according to the invention for producing a pallet. In other words, the advantages described with respect to the pallet according to the invention also apply to the pallet produced using the method. Likewise, the advantages described with respect to the method can be transferred to the pallet according to the invention.

[0011] At the at least one plastically deformed location, the arched bottom can have an upward bias. In other words, at the at least one plastically deformed location, the arched bottom can be biased upward at least in sections. This upward bias of the bottom can intensify the tendency of the pre-deformation or prestressing generated by the at least one plastically deformed location to be in the opposite direction (or, in other words, the arching of the bottom pointing upward). The bias is preferably locally defined by the at least one plastically deformed location. In other words, the arching of the bottom generally extends over a larger portion of the bottom surface of the pallet than the bias.

[0012] As described above, the negative prestressing of the bottom can be generated by indirectly inducing plastic deformation at at least one location in the bottom. Preferably, the at least one location of plastic deformation extends less across the bottom surface than the negative prestressing or arched region. It should also be noted that the negative prestressing or arched region of the bottom preferably extends over at least two-thirds of the bottom surface, particularly preferably over the entire bottom surface. Conversely, the at least one location of plastic deformation preferably extends over less than one-tenth of the bottom surface.

[0013] Preferably, the pallet, in particular its bottom, is approximately rectangular. The rectangle has narrow sides and longitudinal sides extending transversely to the narrow sides. The longitudinal sides extend parallel to the longitudinal direction of the pallet, and the narrow sides extend parallel to the depth direction of the pallet. Preferably, more material is pushed in the longitudinal direction of the pallet than in the depth direction. This can intensify the tendency to create reverse preload or upward arching.

[0014] In order to effectively generate the reverse preload in the bottom, at least one location of the plastic deformation can be formed by an elongated recess. The elongated recess can be, for example, a groove. Here, at least one elongated recess preferably forms an upward bias of the bottom.

[0015] According to another advantageous embodiment, the bottom portion can be provided with a plurality of elongated recesses spaced apart from one another. At least one elongated recess preferably extends in its longitudinal direction parallel to the bottom portion. Preferably, at least one elongated recess extends transversely to at least one edge of the tray.

[0016] The tray can be substantially rectangular, and the longitudinal direction of the at least one elongated recess can extend substantially transversely to the longitudinal direction of the tray, thereby causing more material to be pushed in the longitudinal direction of the tray than transversely to the longitudinal direction, so that the at least one elongated recess can contribute to the curvature of the bottom.

[0017] As an alternative to being oriented transversely to the longitudinal direction of the pallet, the at least one elongated recess can also have a different orientation. In particular, the at least one elongated recess can extend diagonally, i.e., with a directional component transverse to the longitudinal direction of the pallet and a directional component parallel to the longitudinal direction. It is also possible to provide the pallet with a plurality of elongated recesses having different orientations. Preferably, the pallet has a plurality of elongated recesses extending parallel to one another. In particular, the recesses can extend parallel to one another in groups, or in other words, form groups of recesses extending parallel to one another.

[0018] According to a preferred embodiment, the at least one elongated recess extends continuously along its longitudinal axis. Alternatively, however, the at least one elongated recess can also be interrupted at at least one location. It is also possible that a row of recesses, which are not necessarily elongated, are arranged one after another along the longitudinal axis.

[0019] At least one elongated recess, preferably all elongated recesses (if multiple recesses are present), preferably have a length greater than 1 / 3 of the tray depth, particularly preferably greater than 2 / 3 of the tray depth. This effectively creates a curvature of the bottom. The tray depth refers to the depth of the tray bottom, i.e., the depth of the usable surface.

[0020] If the offset is formed by at least one location of plastic deformation, the offset preferably has a height that corresponds at most to the thickness of the bottom. The thickness of the bottom here refers in particular to the thickness of the plate or plate-shaped material forming the bottom. The preferred maximum height of the offset also preferably applies to the case where at least one location of plastic deformation is formed by an elongated recess in the form of a groove. This groove height, which is relatively low for a typical groove, can be sufficient to increase the load-bearing capacity of the pallet, because the plastic deformation of the bottom caused by the groove is already sufficient to produce a reverse preload or an upward bulge of the bottom. A low height of the offset, in particular of the groove, is advantageous so that the volume of the storage area above the bottom for stored items is not restricted to an unnecessarily large extent. In addition, a low height of the offset is advantageous when manufacturing the pallet. In particular, if at least one offset is introduced before the side edge of the pallet is formed on this side, the low height of the offset prevents the plate from being significantly distorted by the introduction of the offset, making further processing difficult.

[0021] Preferably, at least one offset has a height that is at least 0.25 times and at most 1 times the thickness of the base, more preferably at least 0.4 times and at most 0.7 times. A good compromise between producing a sufficient curvature of the base and simultaneously ensuring trouble-free production can be achieved with an offset height that corresponds approximately to 0.55 (±0.05) times the base thickness. For a plate thickness of 2 mm, this corresponds to an offset height of 1.1±0.1 mm.

[0022] At least one elongated recess, and preferably all elongated recesses (if multiple are present), can have a trapezoidal cross-section. The cross-section is taken transversely to the longitudinal direction of the elongated recess. The trapezoidal cross-section can be formed as in a trapezoidal plate, i.e., isosceles, symmetrically, and with the short base of the trapezoid offset upward, i.e., into the receiving area. On the one hand, this cross-section can facilitate the creation of a curved bottom. On the other hand, it allows for simple production of elongated recesses, especially grooves, with such a cross-section. For manufacturing reasons, the trapezoidal cross-section can be rounded. This means that the transition between the remaining bottom and the waist, as well as the transition from the waist to the short base, does not have any sharp transitions, but rather blends into one another in a rounded manner. For manufacturing reasons, the waist and the short base themselves can also deviate from a straight line and be rounded.

[0023] Alternatively, at least one of the elongated recesses can have a semicircular cross-section, with the convex side being arched upward or offset into the receiving area. Other cross-sectional shapes are also possible, in particular those known for grooves. Box-shaped and triangular cross-sections are mentioned here merely as examples. Furthermore, it is also possible that not all elongated recesses have the same cross-section.

[0024] According to an advantageous embodiment, the tray has a plurality of elongated recesses which are distributed equidistantly on the tray. Here, the elongated recesses are preferably arranged parallel to one another in their longitudinal direction and equidistant to one another transversely to the longitudinal direction. Furthermore, the elongated recesses are preferably aligned with one another. In other words, the end portions of the elongated recesses relative to their longitudinal direction are arranged along lines parallel to the longitudinal direction of the tray, respectively.

[0025] Instead of an equidistant arrangement of the elongated recesses, they can also have a different distribution. For example, the spacing between two adjacent elongated recesses can gradually decrease from the narrow sides of the tray to the middle of the tray. Here, the spacing between the two outermost adjacent elongated recesses can be more than twice the spacing of the two inner elongated recesses in the middle region of the tray.

[0026] Preferably, the elongated recesses are distributed symmetrically on the tray. In particular, the elongated recesses can be distributed mirror-symmetrically with respect to a mirror plane running through the middle of the tray and extending transversely to the longitudinal direction thereof.

[0027] Parallel to the narrow sides of the tray, the elongated recesses are preferably provided centrally, i.e. preferably at least one elongated recess has substantially equal edge spacing from both longitudinal sides of the tray, wherein a tolerance in the range of about 5% of the tray depth is feasible due to manufacturing reasons.

[0028] In order to achieve a sufficiently high stability of the entire tray in the case of an increase in the load capacity by the arching according to the application, the tray is provided with at least one flange adjoining the bottom at at least one longitudinal side.

[0029] Preferably, the tray is formed as a punched part. Instead of or in addition to punching, other forming techniques can also be used. In particular, embossing or deep drawing. Preferably, the tray is formed as a punched part with embossed and / or deep-drawn regions. The at least one portion plastically deformed, in particular the at least one elongated recess, is preferably formed integrally with the bottom of the tray. Furthermore, preferably, the at least one flange, preferably all flanges, is also formed integrally with the bottom of the tray. In other words, the tray bottom, the at least one portion plastically deformed and / or the at least one flange can be made from a single sheet by forming.

[0030] In order to produce the at least one portion plastically deformed, in particular at least one extrusion body can be pressed into the bottom from below. Such an extrusion body can in particular be formed by a punch or a roller. The at least one portion plastically deformed can also be formed by deep drawing and / or other suitable techniques.

[0031] The solution according to the present invention allows the load-bearing capacity of a pallet to be increased without requiring additional reinforcement elements, such as welded load-bearing parts or profiles. However, this does not preclude the possibility that a pallet according to the present invention, even one that has at least one elongated recess, can also be provided with additional reinforcement elements. Here, merely as an example, at least one profile extending parallel to or transversely to the longitudinal direction of the pallet is attached below the base. This profile can, for example, be a double-channel profile.

[0032] The magnitude of the reverse prestressing or the arching of the bottom is preferably +2 to -15 mm, more preferably -3 to -6 mm. The value "<0 to -15 mm" represents an upward arching of the bottom. The value ">0 to +2 mm" indicates a downward arching. As already mentioned at the beginning, an arching in the range of ">0 to 2 mm" is advantageous for the pallet according to the invention, as long as the pallet is arched more strongly downwards without at least one location of plastic deformation. In this case, the magnitude is measured between the uppermost point and the lowermost point of the arch or of the arched bottom, respectively on the bottom surface or respectively on the underside of the bottom. For example, the lowermost point of the arch can be, for example, in the immediate vicinity of the fold at the bottom. In the case of exactly one arch, the uppermost point of the arch is usually located in the middle of the pallet. If the pallet is provided with an additional recess, i.e., for example, an introduced or attached profile, the uppermost point of the arch is usually located in the middle of the unreinforced surface of the bottom. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be described in more detail below, using various exemplary embodiments and with reference to the accompanying drawings. The feature combinations shown as examples in the exemplary embodiments can be supplemented by further features, depending on the embodiments described above, to correspond to the properties of the pallet according to the invention required for a particular application. Similarly, individual features can be omitted from the described embodiments, depending on the embodiments described above, if their role in a specific application is not significant.

[0034] In the figures, the same reference signs are used throughout for elements of the same function and / or the same structure.

[0035] The accompanying drawings show:

[0036] Figure 1 A perspective view showing a first embodiment of a tray according to the present invention;

[0037] Figure 2 Show Figure 1 A top view of a tray;

[0038] Figure 3 An exemplary enlarged view of the bulging of a tray according to the invention is shown in a cross-section through the middle of the tray;

[0039] Figure 4 A perspective view showing a second embodiment of a tray according to the present invention;

[0040] Figure 5 Show Figure 4 A top view of a tray;

[0041] Figure 6 A top view showing another exemplary embodiment of a tray bottom according to the present invention;

[0042] Figure 7 A top view showing another exemplary embodiment of a tray bottom according to the present invention;

[0043] Figure 8 A perspective sectional view showing an advantageous embodiment of the elongated recess;

[0044] Figure 9 Shows penetration Figure 8 a cross-sectional view of the elongated recess; and

[0045] Figure 10 A cross-section through a further advantageous form of an elongated recess is shown. DETAILED DESCRIPTION

[0046] In the following, reference Figure 1 and Figure 2 The structure of a first advantageous embodiment of a pallet 1 according to the invention is described.

[0047] The tray 1 is used to accommodate stored objects (not shown). To this end, the tray 1 has a bottom 3, whose bottom surface 5 is accessible from above. The bottom surface 5 on which the stored objects can be placed is the upper side of the bottom 3. The bottom 3 can define a volume on which the stored objects can be placed. This volume is the volume of the tray 1 at the bottom. Figure 1 The receiving area 7 is indicated by a dotted line.

[0048] Viewed from above, the tray 1, at least the bottom 3, has a generally rectangular shape. The narrow sides 9 of the rectangle extend parallel to the tray's depth, or depth direction T. The longitudinal sides 11 of the rectangle extend transversely to the narrow sides 9 and parallel to the tray's longitudinal direction L. Since the tray 1 is generally accessible at at least one of the longitudinal sides 11, the longitudinal direction L is synonymous with the tray's width. The tray's vertical direction V extends perpendicular to the longitudinal direction L and the depth direction T, with the height of the tray 1 extending along the vertical direction V.

[0049] The pallet 1 has a folded edge 13 on the narrow side 9 and a folded edge 15 on the longitudinal side 11. On the one hand, the folded edges 13 and 15 serve to delimit the bottom 3 or the bottom surface 5 transversely to the vertical direction V. On the other hand, the folded edges 13 and 15 absorb the forces transmitted into them by the bottom 3. This strengthens the structure of the pallet 1. Finally, the folded edges 13 and / or 15 can also be used to hang or transport the pallet 1. The narrow side 9 and the longitudinal side 11 are usually formed by edge regions 12 and 14 of the plate 21 from which the pallet 1 is formed. The edge region 12 is here at the narrow side 9 and the edge region 14 is at the longitudinal side 11.

[0050] The bottom 3 preferably has a camber 17 or a reverse prestressing. In other words, the bottom 3 is preferably cambered upwards. Figure 3 , the camber 17 is shown in a greatly enlarged manner in the unloaded state 18. For comparison, Figure 3 The dashed line in represents the unarched tray bottom. Arch 17 preferably extends over at least two-thirds of bottom 3 or bottom surface 5, and more preferably over the entire bottom 3. The size or height 20 of arch 17 is preferably greater than the thickness 41 of bottom 3 and is preferably between 5 and 15 millimeters. Height 20 is measured between the uppermost point 22 and the lowermost point 24 of arch 17. Since arch 17 preferably extends over the entire bottom 3 of tray 1, uppermost point 22 is typically located in the middle 31 of tray 1 or of bottom 3. Lowermost point 24 is typically located near fold 13 or 15.

[0051] Compared to a pallet without a bulge, the load-bearing capacity is increased by the bulge 17 of the bottom 3. If the stored items are placed on the bottom surface 5, the bottom 3 is lowered first, thereby making the bulge 17 flatter. Figure 3 In the case of a tray (indicated by the dashed line in ), the bottom would already bend downwards under the same load. If the bottom were to be subjected to an additional load due to the accommodation of additional stored items, the bottom 3 of the tray 1 according to the invention would also bend downwards if the load were sufficiently great. However, this downward bulge would be correspondingly smaller than in the case of a similar tray without the previous upward bulge. Accordingly, the tray 1 according to the invention bulges downwards to a lesser extent under the same load than a tray without the upward bulge according to the invention. Since a plurality of trays are arranged vertically one above the other in the storage elevator, a higher density of trays can be achieved in the storage elevator by using the tray 1 according to the invention, since the trays can be arranged more closely to one another in the vertical direction V. In contrast, in the case of conventional trays that are significantly bulged downwards, a larger free space would have to be left between two trays arranged one above the other. According to the invention, the upward bulge is not absolutely necessary.

[0052] The pallet 1 can also have a horizontally extending or even downwardly curved bottom 3 in the unloaded state 18. However, in this case, the bottom 3 is not curved downward to the same extent as in a similar pallet 1 without at least one plastically deformable area 19, as will be discussed in more detail below.

[0053] The bulge 17 of the bottom 3 can be produced indirectly. That is, it is possible to dispense with directly forming the bulge 17 itself by a forming method. Instead, the bottom 3 is plastically deformable at at least one location 19. Preferably, the bottom 3 has a plurality of such plastically deformable locations 19. Figure 1 and 2 For the sake of clarity, not all of the plastically deformable areas 19 are provided with reference numerals. The at least one plastically deformable area 19 is spaced apart from the edge regions 12 and 14 of the tray 1 .

[0054] In the plastically deformed areas 19, the material of the plate 21 forming the bottom 3 is presumably displaced laterally. Preferably, more material is displaced in the longitudinal direction L than in the depth direction T. This displaced material can cause the bottom 3 to extend in the longitudinal direction L. However, since the bottom 3 is prevented from expanding in the longitudinal direction L and / or in the depth direction T by the folds 13 and 15, the bottom bulges upward in the vertical direction V.

[0055] At least one plastically deformed area 19, preferably all plastically deformed areas 19, are integral, i.e., formed in one piece with the base 3 from a plate-like stock material 21, hereinafter referred to as "plate 21." Preferably, the plastically deformed areas 19 are introduced into the plate 21 before the folds 13 and 15 are formed.

[0056] In a preferred embodiment, the plastically deformed portion 19 is formed as an elongated recess 23. The elongated recess 23 is preferably a groove 25. This elongated recess 23 or groove 25 is formed in Figure 8 and 9 Reference is also made here to these two drawings.

[0057] Each plastic deformation location 19 is preferably an upward deflection 27 of the bottom 3. Therefore, in this case, the term "recess" 23 relates to a recess 23 at the underside 29, by which the bottom 3 is pressed upward from the underside 29.

[0058] The elongated recesses 23 of the first embodiment extend parallel to one another and parallel to the narrow sides 9. In the depth direction T, the elongated recesses 23 are aligned with one another so that they all terminate at both ends on an imaginary line extending parallel to the longitudinal side 11. Preferably, the elongated recesses 23 are arranged equidistantly.

[0059] The center 31 of the pallet bottom 3 preferably has no plastically deformed areas 19. Here, the center 31 is the center of the bottom surface 5 when the pallet bottom 3 is viewed from above. This can be advantageous in order to hold the pallet 1 in its center 31 during production of the pallet 1 or the sheet 21 during forming thereof, for example, by means of a turntable of a punch-bending machine.

[0060] The elongated recess 23 is preferably arranged centrally between the longitudinal sides 11 of the tray 1 in the depth direction T. This means that the distance between the elongated recess 23 and the longitudinal sides 11 or the fold 15 is essentially the same on both longitudinal sides 11, wherein manufacturing tolerances in the range of 5% are possible.

[0061] The elongated recesses 23 extend along a longitudinal direction 33, which preferably extends perpendicularly to the longitudinal direction L of the tray 1. Along the longitudinal direction 33, the elongated recesses 23 each preferably have a length 35 that is greater than 1 / 3±10% of the depth 37 of the tray 1. Particularly preferably, the elongated recesses 23 each preferably have a length 35 that is greater than 1 / 3±10% of the depth 37 of the tray 1. The depth 37 of the tray 1 is hereby understood to be the depth 37 of the bottom surface 5.

[0062] The offset 27 preferably has a height 39 that is at most equal to the thickness 41 of the base 3. The height 39 of the offset 27 is measured from the base 5 on the offset 27 relative to the base 5 in the area not offset upward. The thickness 41 of the base 3 preferably corresponds to the thickness of the sheet metal 21 used to produce the base 3. Particularly preferably, the height 39 of the offset 27 corresponds to 0.4 to 0.7 times the thickness 41. Therefore, the height 39 of the offset 27 is preferably smaller than the height 20 of the bulge 17.

[0063] If the at least one plastically deformed area 19 is formed by a groove 25 , the height 39 of the offset 27 corresponds to the groove height. Alternatively, the at least one offset 27 can also have a height 39 that is greater than the thickness 41 of the bottom 3 .

[0064] According to the Figure 8 and 9In one advantageous embodiment shown in FIG, at least one elongated recess 23 or groove 25 has a trapezoidal cross-section transverse to the longitudinal direction 33 of the elongated recess 23. In other words, the elongated recess 23 has two mirror-symmetrical waists 43 in cross-section, which extend at an angle 45 to the undeformed bottom surface 5. This angle 45 is preferably between 25° and 35°. A substantially straight region 47 extends between the two waists 43. The straight region 47 preferably has a length 49 extending transverse to the longitudinal direction 33 of the elongated recess 23, which is longer than the length 51 of the waist 43. The elongated recess 23 thus has an overall flat shape. The straight region 47 does not necessarily have to extend exactly straight. For manufacturing reasons, the region can also have a slight upward curvature.

[0065] Alternatively or additionally, at least one elongated recess 23 can have a semicircular cross section. In the case of a semicircular cross section, the convex side is preferably arched upwards into the receiving area 7. This cross section is Figure 10 As shown in. Figure 8 and 9 The trapezoidal cross section of the ferrule does not necessarily have a sharp transition depending on the manufacturing technology, so the cross section can also be rounded so that the cross-sectional shape as a whole can be similar to Figure 10 The more rounded the transition, the closer the trapezoid is to a semicircle. In addition, other cross sections are also possible, in particular cross sections such as those known for the grooves.

[0066] In the following, reference Figure 4 and Figure 5 Another advantageous embodiment of the tray 1 according to the invention is described. Here, for the sake of brevity, only the following is discussed in depth with reference to Figure 1 and Figure 2 Differences in the described embodiments.

[0067] The second embodiment of the pallet 1 according to the present invention is similar to the reference Figure 1 and Figure 2 The first embodiment described differs in that the elongated recesses 23 or grooves 25 are not distributed equidistantly along the longitudinal direction L of the tray 1. Instead, the distance between two elongated recesses 23 decreases from the narrow side 9 towards the middle 31 of the tray.

[0068] The distribution of the elongated recesses 23 in the longitudinal direction L is preferably mirror-symmetrical relative to a mirror plane extending through the center 31 and transversely to the longitudinal direction L. The distance 53 between the two outermost elongated recesses 23 is greater than twice the distance 55 between the two elongated recesses 23 closest to the center 31 .

[0069] At the level of the pallet center 31 there is an elongated recess 23 which is interrupted in the region of the center 31 in order, as in the previously described embodiment, to leave the center 31 itself free, in particular for a turntable of a punch-bending machine.

[0070] Figure 6 and 7 Two further examples of the design of the plastic deformation locations 19 of the pallet 1 according to the invention are shown merely schematically. Figure 6 The plastic deformation point 19 of the pallet 1 in FIG. 1 is formed as an elongated recess 23 , which can be designed like the elongated recess 23 described above.

[0071] However, with reference Figure 1 and Figure 2 Unlike the embodiment described, the longitudinal direction of the elongated recesses 23 is not parallel to the narrow sides 9 or perpendicular to the longitudinal sides 11. Instead, the elongated recesses 23 are arranged obliquely, extending at an angle of less than 45° relative to the narrow sides 9. Here, the elongated recesses 23 extend in groups and in parallel. Here, too, the distribution of the elongated recesses 23 is preferably symmetrical relative to a mirror plane extending through the center 31 and transverse to the longitudinal direction L.

[0072] Merely as an example, the elongated recesses 23 are arranged equidistant from one another on one half of the tray. Alternatively, the spacing between two adjacent elongated recesses 23 can also vary.

[0073] Another feasible design of the plastic deformation portion 19 is Figure 7 This design is similar to the Figure 1 and 2 The described embodiment.

[0074] However, unlike the first embodiment, the elongated recess 23 is not formed continuously. Figure 7 The embodiment shown in FIG has a row of elongated recesses 23 that extend one next to the other in the depth direction T of the tray 1 . Each elongated recess 23 has a longitudinal direction 33 , which preferably also extends parallel to the depth direction T. In other words, this design is similar to the first embodiment, except that the elongated recesses 23 are interrupted several times.

[0075] Reference Signs List

[0076] 1 pallet

[0077] 3 bottom

[0078] 5 bottom

[0079] 7Accommodation area

[0080] 9 narrow side

[0081] 11 longitudinal side

[0082] 12 Marginal Area

[0083] 13 Folding

[0084] 14 Marginal Area

[0085] 15 Hem

[0086] 17 Arch

[0087] 18 Unloaded state

[0088] 19 Plastic deformation area

[0089] 20 Arch height

[0090] 21 Plate raw materials

[0091] 22 Highest point of the arch

[0092] 23 recess

[0093] 24 Lowest point of the arch

[0094] 25 grooves

[0095] 27 Bias

[0096] 29 bottom side

[0097] 31 middle of tray

[0098] 33 Longitudinal direction of the elongated recess

[0099] 35 Length of the elongated recess

[0100] 37 tray depth

[0101] 39 Offset Height

[0102] 41 Bottom thickness

[0103] 43 waist

[0104] 45°

[0105] 47 Flat Area

[0106] 49 Length of the straight area

[0107] 51 waist length

[0108] 53 Spacing between external elongated recesses

[0109] 55 Spacing between internal elongated recesses

[0110] L Longitudinal direction

[0111] T Depth direction

[0112] V vertical direction.

Claims

1. A tray (1) for a storage lift, having a bottom (3) for placing stored items, wherein The bottom (3) is plastically deformable at at least one location (19) spaced apart from at least one edge region (12, 14), wherein, in the at least one plastically deformed location (19), the plate-like raw material (21) forming the bottom (3) is pushed laterally, so that the bottom (3) is elongated in the longitudinal direction (L), causing the bottom (3) to bulge upward (17) along the vertical direction (V) because the bottom (3) is prevented from expanding in area in the longitudinal direction (L) and / or in the depth direction (T).

2. The pallet (1) according to claim 1, wherein The base (3) is curved upward in the unloaded state (18).

3. The pallet (1) according to claim 1 or 2, wherein: The arched bottom (3) has an upward bias (27) at the at least one plastically deformable location (19).

4. The pallet (1) according to claim 1 or 2, wherein: The at least one plastically deformable region (19) is formed by an elongated recess (23).

5. The pallet (1) according to claim 4, wherein The tray (1) is substantially elongated, and the longitudinal direction (33) of at least one of the elongated recesses (23) extends substantially transversely to the longitudinal direction (L) of the tray.

6. The pallet (1) according to claim 4, wherein The length (35) of at least one of the elongated recesses (23) is greater than 1 / 3 of the tray depth (37).

7. The pallet (1) according to claim 3, wherein: The height (39) of at least one offset (27) corresponds at most to the thickness (41) of the base (3).

8. The pallet (1) according to claim 1 or 2, wherein: The pallet (1) is constructed as a punched and bent part.

9. The pallet (1) according to claim 1 or 2, wherein: The at least one plastically deformable region (19) is constructed integrally with the bottom (3) of the tray (1).

10. The pallet (1) according to claim 1, wherein At least one edge region of the pallet (1) is reinforced by folding the plate-like stock material (21).

11. A method for producing a pallet (1) from a plate-shaped stock (21) by forming, wherein: The bottom (3) of the tray (1) is plastically deformable at at least one location (19) spaced apart from at least one edge region (12, 14), wherein, in the at least one plastically deformed location (19), the plate-like raw material (21) forming the bottom (3) is pushed laterally, so that the bottom (3) is elongated in the longitudinal direction (L), causing the bottom (3) to bulge upward (17) along the vertical direction (V) because the bottom (3) is prevented from expanding in area in the longitudinal direction (L) and / or in the depth direction (T).

12. The method according to claim 11, wherein An upwardly directed curvature (17) of the base (3) is produced by the at least one plastically deformable region (19).

13. The method according to claim 11 or 12, wherein: At the at least one plastically deformable location (19), the material of the bottom (3) is pushed away from the at least one deformed location (19).

14. The method according to claim 11 or 12, wherein: At least one displacement body is pressed from below into the bottom (3) at the at least one location (19).

15. The method according to claim 11 or 12, wherein: The at least one portion (19) is formed by deep drawing the bottom (3).

16. The method according to claim 11 or 12, wherein: After the at least one plastically deformable location (19) has been produced in the bottom (3), the plate-shaped blank (21) is folded at at least one edge region (12, 14).

17. A tray (1) for a storage lift, having a bottom (3) for placing stored items, wherein: The bottom (3) is plastically deformable at at least one location (19) spaced apart from at least one edge region (12, 14), wherein a reverse prestressing in the bottom (3) is generated by the at least one plastically deformed location (19), wherein the region of the reverse prestressing extends over at least 2 / 3 of the bottom surface, and wherein the at least one plastically deformed location (19) extends over less than 1 / 10 of the bottom surface.

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