Tray for storage lift

Abstract

The invention relates to a pallet (1) for a storage lift and to a method for producing a pallet (1). In order to provide a pallet (1) which has an increased load capacity, which is at the same time compact and easy to manufacture, 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 region (12, 14).

Description

[0001] This application is a divisional application of the invention patent application filed on November 21, 2018, entering the Chinese national phase on May 22, 2020, with application number 201880075779.X, entitled "Tray for Storage Lift". Technical Field

[0002] This invention relates to a pallet for a storage lift, having a bottom for placing stored items. The invention also relates to a method for manufacturing the pallet from a sheet-like material. Background Technology

[0003] Pallets for use in storage lifts are known. They are used to store goods in storage lifts and are typically movable within the lift. A number of requirements exist for pallets. One is that they must have sufficient load-bearing capacity for the items to be stored. Furthermore, it is advantageous that pallets, especially in the vertical direction (perpendicular to the bottom), occupy very little structural space, allowing multiple pallets to be stacked on top of each other within a storage lift of a predetermined size. Summary of the Invention

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

[0005] For pallets of the aforementioned type, this objective is achieved by plastically deforming the bottom at at least one location spaced apart from the edge region, wherein, at at least one location of plastic deformation, the sheet material forming the bottom is laterally pushed, causing the bottom to elongate in the longitudinal direction, resulting in an upward arching of the bottom in the vertical direction, since the bottom is prevented from expanding its area in the longitudinal direction and / or in the depth direction. For the method initially proposed, this objective is achieved by: the pallet being manufactured from sheet material, particularly by molding sheet metal, wherein the bottom of the pallet is plastically deformed at at least one location spaced apart from the edge region, wherein, at at least one location of plastic deformation, the sheet material forming the bottom is laterally pushed, causing the bottom to elongate in the longitudinal direction, resulting in an upward arching of the bottom in the vertical direction, since the bottom is prevented from expanding its area in the longitudinal direction and / or in the depth direction.

[0006] At least one site of plastic deformation can induce stress in the bottom material, particularly sheet-like material. This stress can then produce an upward arching of the bottom, with reference to a similar pallet without at least one site of plastic deformation. In other words, the bottom of a pallet without at least one site of plastic deformation would sag downwards due to its own weight, while with at least one site of plastic deformation, the bottom of the pallet sags less, or instead extends horizontally or arches upwards. Therefore, compared to a pallet without at least one site of plastic deformation according to the invention, the introduction of at least one site of plastic deformation generates negative prestress in the bottom, or produces an upward arching of the bottom.

[0007] This indirect arching can be achieved by pushing the bottom material laterally, away from at least one point of plastic deformation, at least one point where plastic deformation has occurred. This pushing of the material generates, in particular, laterally oriented pressure in the bottom of the pallet. Because the pallet is typically defined up to its sides and these sides can be reinforced, the bottom can utilize the formation of an arch in response to the pressure generated by plastic deformation.

[0008] By means of the upward arch at the bottom, the pallet can be pre-deformed or pre-stressed in the reverse direction when unloaded, i.e., without stored items. If the pallet is now unloaded and the load acting on the bottom increases, the bottom arches downward. Compared to similar pallets without the plastic deformation portion according to the invention at the bottom, the degree of downward arching at the bottom is less due to this upward reverse deformation. In other words, when the bottom bears the load of stored items, the upward arching is overcome before the bottom arches downward due to the weight of the stored items. This minimizes the downward arching at the bottom. Therefore, compared to pallets without the plastic deformation portion according to the invention, the bottom of the pallet according to the invention arches downward less under the same load. In this way, multiple pallets can be arranged in a storage lift with a small vertical overlap. Because the downward arching is reduced compared to conventional pallets, the pallet according to the invention can accommodate more loads with the same space requirements.

[0009] The term "bottom of the tray" refers to a horizontal, preferably continuous structure that defines downwardly a receiving area for the contents of the tray. Here, at least a portion of the contents are located on a bottom surface accessible from above. In the method according to the invention, "bottom" refers to a region of sheet-like material, particularly a plate, which subsequently forms the bottom of the tray. At least one portion of the plastic deformation according to the invention differs from the tray bottom deformation described above produced by the plastic deformation portion according to the invention. Although at least one portion of the plastic deformation according to the invention is locally limited in the tray bottom, particularly in terms of area expansion, the area of ​​reverse prestressing or upward arching involves a larger area of ​​the bottom, which, depending on the design, can also occupy a large portion of the bottom. For brevity, the term "plate" will be used hereinafter for the term "sheet-like material." The tray, especially the bottom, can be formed from a plate. Alternatively or additionally, the tray can also be formed from multiple plates. It is also not excluded that the manufactured tray has other components, such that it consists of multiple individual components. For example, the tray can also be provided with attached corner supports.

[0010] The design according to the invention can be further improved by combining different, each advantageous in itself, design schemes that can be arbitrarily combined with each other. These design schemes and their associated advantages are discussed in detail below. Here, the design of the pallet according to the invention can be manufactured using the method for manufacturing pallets according to the invention. In other words, the advantages described regarding the pallet according to the invention also apply to the pallet manufactured by this method. Similarly, the advantages described regarding the method can be transferred to the pallet according to the invention.

[0011] At at least one location of plastic deformation, the bottom of the arch can be biased upwards. In other words, at at least one location of plastic deformation, the bottom of the arch can be biased upwards at least in a partial section. This upward bias of the bottom enhances the tendency of pre-deformation or pre-tightening generated by at least one location of plastic deformation to occur in the opposite direction (or, in other words, the arch at the bottom points upwards). The bias is preferably locally defined by at least one location of plastic deformation. In other words, compared to the bias, the arch at the bottom typically extends over a larger portion of the bottom surface of the tray.

[0012] As described above, reverse preload on the bottom can be generated by indirectly introducing plastic deformation at at least one location in the bottom. Preferably, the extent of the plastic deformation on the bottom surface is less than that of the reverse preload or arched area. It should also be mentioned that the reverse preload or arched area of ​​the bottom preferably extends over at least 2 / 3 of the bottom surface, and particularly preferably over the entire bottom surface. Conversely, at least one location of plastic deformation preferably extends over less than 1 / 10 of the bottom surface.

[0013] Preferably, the pallet, especially its bottom, is generally rectangular. Here, the rectangle has a narrow side and a longitudinal side extending laterally to the narrow side. The longitudinal side extends parallel to the longitudinal direction of the pallet, and the narrow side extends parallel to the depth direction of the pallet. Preferably, more material is pushed along the longitudinal direction of the pallet compared to the depth direction. This strengthens the tendency to generate reverse preload or upward arching.

[0014] To effectively generate reverse preload at the bottom, at least one portion of the plastic deformation can be formed by an elongated recess. The elongated recess can be, for example, a groove. Preferably, at least one elongated recess forms an upward-facing offset.

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

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

[0017] Instead of being oriented transversely to the longitudinal direction of the tray, at least one elongated recess can also have a different orientation. In particular, at least one elongated recess can extend diagonally, i.e., have a directional component transverse to the longitudinal direction of the tray and a directional component parallel to the longitudinal direction. It is also possible for the tray to have multiple elongated recesses with different orientations. Preferably, the tray has multiple elongated recesses extending parallel to each other. The recesses can in particular extend parallel to each other in groups, or in other words, form groups of recesses extending parallel to each other.

[0018] According to a preferred design, at least one elongated recess extends continuously along its longitudinal axis. However, alternatively, the at least one elongated recess can also be interrupted at at least one location. It is also possible that the elongated recesses are not necessarily arranged in a row along the longitudinal axis.

[0019] At least one elongated recess, preferably all elongated recesses (where multiple recesses exist), preferably has a length greater than 1 / 3, particularly preferably greater than 2 / 3, of the tray depth. This effectively creates an arch at the bottom. The tray depth here 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 part of plastic deformation, the offset preferably has a height at most corresponding to the thickness of the bottom. Here, the thickness of the bottom refers in particular to the thickness of the material of the plate or plate-shaped material forming the bottom. The preferred maximum height of the offset is also preferably applicable when at least one part of the plastic deformation is formed by an elongated recess in the form of a groove. For a typical groove, the relatively low height of the groove is sufficient to increase the load-bearing capacity of the pallet, since the plastic deformation of the bottom caused by the groove is sufficient to produce a reverse preload or an upward arching of the bottom. The lower height of the offset, especially the groove, is advantageous so that the volume of the receiving area above the bottom for storing items is not unnecessarily limited. Furthermore, the low height of the offset is advantageous in pallet manufacturing. In particular, when at least one offset is introduced before forming the side edge of the pallet on this side, the low height of the offset prevents the plate from being significantly twisted due to 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 bottom thickness, more preferably at least 0.4 times and at most 0.7 times. A good compromise that results in a sufficient bottom arch while simultaneously appearing to be easy to manufacture can be achieved by an offset height that corresponds approximately to 0.55 (±0.05) times the bottom thickness. This corresponds to an offset height of 1.1 ± 0.1 mm in the case of a 2 mm plate thickness.

[0022] At least one elongated recess, preferably all elongated recesses (if multiple are present), can have a trapezoidal cross-section. The cross-section is viewed transversely to the longitudinal direction of the elongated recess. The trapezoidal cross-section can be formed as in a trapezoidal plate, i.e., isosceles, symmetrical, and offset with the shorter base of the trapezoid pointing upwards, i.e., into the receiving area. On the one hand, this cross-section facilitates the creation of a bulge at the bottom. On the other hand, it allows for the simple manufacture of elongated recesses, especially grooves, with this cross-section. For manufacturing purposes, the aforementioned trapezoidal cross-section can be rounded. That is to say, the transitions between the remaining base and waist, and from the waist to the shorter base, are not sharp but rather merge with each other in a rounded manner. The waist and the shorter base themselves can also deviate from a straight line and be rounded for manufacturing purposes.

[0023] Alternatively, at least one elongated recess can have a semi-circular cross-section, wherein the convex side arches upward or is offset into the receiving area. Other cross-sectional shapes are also possible, especially for known cross-sectional shapes of recesses. Box-shaped and triangular cross-sections are mentioned here only 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 equidistantly distributed on the tray. Preferably, the elongated recesses are arranged parallel to each other in their longitudinal direction and equidistant from each other transversely in the longitudinal direction. Furthermore, the elongated recesses are preferably aligned with each other. In other words, the ends of the elongated recesses relative to their longitudinal direction are arranged along lines parallel to the longitudinal direction of the tray.

[0025] Instead of equidistant arrangements of elongated recesses, they can also have different distributions. For example, the distance between two adjacent elongated recesses can gradually decrease from the narrow side of the tray towards the center. Here, the distance between the two outermost adjacent elongated recesses can be more than twice the distance between the two innermost elongated recesses in the central region of the tray.

[0026] Preferably, the elongated recesses are symmetrically distributed on the tray. In particular, the elongated recesses can be mirror-symmetrically distributed with respect to a mirror plane that passes through the center of the tray and extends laterally to its longitudinal direction.

[0027] Parallel to the narrow side of the tray, the elongated recess is preferably located in the center, that is, preferably, at least one elongated recess has substantially equal edge spacing from the two longitudinal sides of the tray, wherein, due to manufacturing reasons, a tolerance of about 5% of the tray depth is feasible.

[0028] In order to achieve sufficiently high stability of the entire pallet while increasing the load-bearing capacity by arching according to the invention, the pallet is provided with at least one folded edge adjacent to the bottom on at least one longitudinal side.

[0029] Preferably, the pallet is formed as a bent part. Other forming techniques, alternative to or in addition to bending, can also be used, particularly embossing or deep drawing. Preferably, the pallet is formed as a bent part with embossed and / or deep-drawn areas. At least one portion of the plastic deformation, particularly at least one elongated recess, is preferably integrally formed with the bottom of the pallet. Additionally, preferably, at least one flange, and preferably all flanges, are also integrally formed with the bottom of the pallet. In other words, the bottom of the pallet, at least one portion of the plastic deformation, and / or at least one flange can be formed from a single sheet.

[0030] To produce at least one portion of plastic deformation, at least one extruded body can be pressed into the bottom from below. This extruded body can be formed, in particular, by a punch or roller. At least one portion of plastic deformation can also be formed by deep drawing and / or other suitable techniques.

[0031] The solution according to the invention allows for increased load-bearing capacity of pallets without the need for additional reinforcing elements such as welded load-bearing members or profiles. However, it is not excluded that pallets according to the invention, even if they have, for example, at least one elongated recess, may also have additional reinforcing elements. Here, only by example is it suggested that at least one profile extending parallel or transverse to the longitudinal direction of the pallet be attached below the bottom. For example, such a profile could be a dual-channel profile.

[0032] The size of the bottom reverse preload or bulge is preferably +2 to -15 mm, more preferably -3 to -6 mm. A value "<0 to -15 mm" represents an upward bulge at the bottom. A value ">0 to +2 mm" indicates a downward bulge. As mentioned at the beginning, for pallets according to the invention, bulges in the range of ">0 to 2 mm" are advantageous, provided that at least one part of the pallet does not exhibit plastic deformation and bulges downward more strongly. Here, the size is measured, either on the bottom surface or on the underside of the bottom, between the uppermost and lowermost points of the bulge or the bottom of the bulge. For example, the lowermost point of the bulge may be adjacent to the fold at the bottom. In the case of exactly one bulge, the uppermost point of the bulge is usually located in the middle of the pallet. If the pallet has additional recesses, i.e., introduced or attached profiles, the uppermost point of the bulge is usually located in the middle of the unreinforced surface of the bottom. Attached Figure Description

[0033] The invention will now be described in more detail, exemplarily, according to different embodiments and with reference to the accompanying drawings. The feature combinations exemplarily shown in the embodiments can be supplemented by other features to correspond to the characteristics required for a specific application of the tray according to the invention, based on the above embodiments. If the role of a feature in a particular application is not important, individual features can also be omitted from the described embodiments, as described above.

[0034] In the accompanying drawings, the same reference numerals are always used for elements with the same function and / or the same structure.

[0035] The attached diagram shows:

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

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

[0038] Figure 3 An exemplary enlarged view of the arch of the pallet according to the present invention is shown in cross-section through the middle of the pallet;

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

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

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

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

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

[0044] Figure 9 Showing through Figure 8 A cross-sectional view of the elongated concave portion; and

[0045] Figure 10 A cross-sectional view of an elongated recess in another advantageous form is shown. Detailed Implementation

[0046] In the following text, see references Figure 1 and Figure 2 The structure of a first advantageous embodiment of the tray 1 according to the present invention is described.

[0047] Tray 1 is used to hold storage items (not shown). For this purpose, tray 1 has a bottom 3, the bottom surface 5 of which is accessible from above. The bottom surface 5, on which storage items can be placed, is the upper side of the bottom 3. The volume on which storage items are placed is defined downwards by the bottom 3. This volume is a portion of the tray 1's... Figure 1 The area to be contained is indicated by the dashed line in section 7.

[0048] Viewed from above, tray 1, and at least its bottom 3, have a generally rectangular shape. Here, the narrow side 9 of the rectangle extends parallel to the tray's depth or depth direction T. The longitudinal side 11 of the rectangle extends laterally to the narrow side 9 and parallel to the tray's longitudinal direction L. Since tray 1 is typically accessible at at least one longitudinal side 11, the longitudinal direction L has the same meaning as the tray's width direction. The vertical direction V of the tray extends perpendicular to both the longitudinal direction L and the depth direction T, and the height of tray 1 extends along the vertical direction V.

[0049] At the narrow side 9, the pallet 1 has a flange 13, and at the longitudinal side 11, it has a flange 15. On one hand, flanges 13 and 15 define the bottom 3 or bottom surface 5 transversely to the vertical direction V. On the other hand, flanges 13 and 15 bear the force transmitted into them from the bottom 3. Thus, the structure of the pallet 1 is reinforced. Finally, flanges 13 and / or 15 can also be used for hanging or transporting the pallet 1. The narrow side 9 and the longitudinal side 11 are generally formed by edge regions 12 and 14 of the plate 21 from which the pallet 1 is formed. Edge region 12 is located at the narrow side 9, and edge region 14 is located at the longitudinal side 11.

[0050] The bottom 3 preferably has an arch 17 or a reverse preload. In other words, the bottom 3 preferably arches upwards. Figure 3 In the image, the arch 17 in the unloaded state 18 is shown at a significantly magnified level. For comparison, Figure 3 The dotted line should represent the un-arched bottom of the pallet. The arch 17 preferably extends over at least two-thirds of the bottom 3 or bottom surface 5, more preferably over the entire bottom 3. The size or height 20 of the arch 17 is preferably greater than the thickness 41 of the bottom 3 and preferably between 5 and 15 mm. Here, the height 20 is measured between the uppermost point 22 and the lowermost point 24 of the arch 17. Since the arch 17 preferably extends over the entire bottom 3 of the pallet 1, the uppermost point 22 is typically located in the area of ​​the middle 31 of the pallet 1 or bottom 3. The lowermost point 24 is typically located near the folded edge 13 or 15.

[0051] Compared to a flat pallet, the arch 17 at the bottom 3 increases load-bearing capacity. When stored items are placed on the bottom surface 5, the bottom 3 first lowers, thus flattening the arch 17. It does not arch when unloaded (as with...). Figure 3 In the case of a pallet (indicated by the dotted line), the bottom already arches downwards under the same load. If the bottom bears an additional load due to accommodating other stored items, the bottom 3 of the pallet 1 according to the invention will also arch downwards under a sufficiently large load. However, this downward arch will be correspondingly smaller than that in the case of a similar pallet without the previous upward arch. Accordingly, the pallet 1 according to the invention arches downwards less under the same load compared to a pallet without the upward arch according to the invention. Since multiple pallets are arranged vertically overlapping each other in a storage lift, a higher pallet density can be achieved in the storage lift by using the pallet 1 according to the invention, because the pallets can be arranged more closely together along the vertical direction V. Conversely, in a conventional pallet with a large downward arch, a larger free space must be left between two pallets arranged overlapping each other. According to the invention, an upward arch is not absolutely necessary.

[0052] The tray 1 can also have a horizontally extending or even downwardly arched bottom 3 in the unloaded state 18. However, in this case, the degree to which the bottom 3 arches downward is not as great as in a similar tray 1 with at least one part 19 that does not have plastic deformation, which will be discussed in detail below.

[0053] The arch 17 of the bottom 3 can be produced indirectly. That is, the direct molding of the arch 17 itself by a molding method can be omitted. Instead, the bottom 3 is plastically deformable at at least one location 19. Preferably, the bottom 3 has multiple such plastically deformable locations 19. Figure 1 and 2 For overview purposes, not all plastically deformable portions 19 are provided with reference numerals. At least one plastically deformable portion 19 is spaced apart from the edge regions 12 and 14 of the tray 1.

[0054] In the plastically deformed portion 19, the material of the plate 21 forming the bottom 3 is approximately pushed laterally. Preferably, more material is pushed in the longitudinal direction L than in the depth direction T. This pushing of material can cause the bottom 3 to elongate in the longitudinal direction L. However, since the bottom 3 is prevented from expanding its surface in the longitudinal direction L and / or in the depth direction T by the folds 13 and 15, the bottom arches upward in the vertical direction V.

[0055] At least one portion 19 of the plastic deformation, preferably all portions 19 of the plastic deformation, are integrally formed with the bottom 3 from a sheet-like material 21, hereinafter referred to as "sheet 21". Preferably, the plastic deformation portions 19 are introduced into the sheet 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... Figure 8 and 9 The details are shown below. Please also refer to the two accompanying figures.

[0057] Each plastically deformed portion 19 is preferably an upwardly offset 27 of the bottom 3. Thus, in this case, the term "recess" 23 refers to a recess 23 at the lower side 29 through which the bottom 3 is pressed upward from the lower side 29.

[0058] In the first embodiment, the elongated recesses 23 extend parallel to each other and parallel to the narrow side 9. In the depth direction T, the elongated recesses 23 are aligned with each other such 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 at equal intervals.

[0059] The middle portion 31 of the pallet bottom 3 preferably does not have a plastically deformable portion 19. Here, when viewed from above, the middle portion 31 refers to the middle of the bottom surface 5. This is advantageous for holding the pallet 1 in its middle portion 31 during the manufacture of the pallet 1 or for holding the plate 21 in its middle portion 31, for example, by means of a turntable of a bending machine, during the forming of the plate 21.

[0060] Along the depth direction T, the elongated recess 23 is preferably arranged centrally between the longitudinal sides 11 of the tray 1. That is to say, the spacing between the elongated recess 23 and the longitudinal side 11 or the flange 15 is substantially the same on both longitudinal sides 11, wherein a manufacturing tolerance within the range of 5% is feasible.

[0061] The elongated recess 23 extends along a longitudinal direction 33, which is preferably perpendicular to the longitudinal direction L of the tray 1. Along the longitudinal direction 33, the elongated recess 23 preferably has a length 35 greater than 1 / 3 ± 10% of the depth 37 of the tray 1. Particularly preferably, the elongated recess 23 preferably has a length 35 greater than 1 / 3 ± 10% of the depth 37 of the tray 1. The depth 37 of the tray 1 here refers to 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 bottom 3. The height 39 of the offset 27 is measured here from the bottom surface 5 on the offset 27 relative to the bottom surface 5 in the region not offset upwards. The thickness 41 of the bottom 3 preferably corresponds to the thickness of the plate 21 used to manufacture the bottom 3. Particularly preferably, the height 39 of the offset 27 corresponds to 0.4 to 0.7 times the thickness 41. The height 39 of the offset 27 is therefore preferably less than the height 20 of the arch 17.

[0063] In the case where at least one portion 19 of plastic deformation is formed by a groove 25, the height 39 of the offset 27 corresponds to the height of the groove. Alternatively, at least one offset 27 may also have a height 39 greater than the thickness 41 of the bottom 3.

[0064] According to, as also Figure 8 and 9An advantageous design shown in the figure has at least one elongated recess 23 or groove 25 having a trapezoidal cross-section transverse to the longitudinal direction 33 of the elongated recess 23. In other words, the elongated recess 23 has two waists 43 that are mirror-symmetrical to each other in cross-section, the waists extending 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 transversely to the longitudinal direction 33 of the elongated recess 23, which is longer than the length 51 of the waists 43. The elongated recess 23 therefore has a generally flat shape. The straight region 47 does not necessarily have to extend precisely straight. For manufacturing reasons, the region can also have a slightly upward arch.

[0065] Alternatively or additionally, at least one elongated recess 23 may have a semi-circular cross-section. In the case of a semi-circular cross-section, the convex side preferably arches upwards into the receiving area 7. This cross-section... Figure 10 As shown in the image. Because... Figure 8 and 9 The trapezoidal cross-section depends on the manufacturing technique and does not necessarily have a sharp transition, so the cross-section can also be rounded, making the overall cross-sectional shape similar to... Figure 10 The more rounded the transition, the closer the trapezoid is to a semicircle. Furthermore, other cross-sections are also possible, especially those known for the groove.

[0066] In the following text, see references Figure 4 and Figure 5 Another advantageous embodiment of the tray 1 according to the invention is described herein. For the sake of brevity, only detailed discussion and reference are provided. Figure 1 and Figure 2 The differences in the described implementation methods.

[0067] Second embodiment of the tray 1 according to the present invention and reference Figure 1 and Figure 2 The difference in the first embodiment described is that the elongated recesses 23 or grooves 25 are not evenly spaced along the longitudinal direction L of the tray 1. Instead, the distance between two elongated recesses 23 gradually decreases from the narrow side 9 toward the center 31 of the tray.

[0068] The distribution of the elongated recesses 23 in the longitudinal direction L is preferably mirror-symmetrical with respect to a mirror plane that extends through the middle portion 31 and transversely to the longitudinal direction L. The distance 53 between the two outermost elongated recesses 23 is more than twice the distance 55 between the two elongated recesses 23 closest to the middle portion 31.

[0069] An elongated recess 23 is located at the height of the center 31 of the tray, and it is interrupted in the region of the center 31 so as to leave the center 31 itself empty, as in the previously described embodiments, especially for the turntable of a bending machine.

[0070] Figure 6 and 7 Two other examples of the design of the plastic deformation portion 19 of the tray 1 according to the present invention are shown only schematically. Figure 6 The plastic deformation portion 19 of the tray 1 is formed as an elongated recess 23, which can be constructed as the elongated recess 23 described above.

[0071] However, compared with the reference Figure 1 and Figure 2 In a different implementation, the longitudinal direction of the elongated recesses 23 is neither parallel to the narrow side 9 nor perpendicular to the longitudinal side 11. Instead, the elongated recesses 23 are arranged obliquely, extending at an angle of less than 45° relative to the narrow side 9. Here, the elongated recesses 23 extend in groups in parallel. The distribution of the elongated recesses 23 is also preferably symmetrical with respect to the mirror plane that passes through the middle portion 31 and extends transversely to the longitudinal direction L.

[0072] As an example only, the elongated recesses 23 are equidistant from each other on one half of the tray. Alternatively, the spacing between two adjacent elongated recesses 23 can also be varied.

[0073] Another feasible design scheme for the plastic deformation part 19 is... Figure 7 As shown in the image. This design scheme is similar to that regarding... Figure 1 and 2 The described implementation method.

[0074] However, unlike the first embodiment, the elongated recess 23 is formed discontinuously. Instead, Figure 7 The embodiment shown has rows of elongated recesses 23 that extend relative to each other along 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 multiple times.

[0075] List of reference numerals

[0076] 1 tray

[0077] 3 bottom

[0078] 5 bottom

[0079] 7 Accommodation Area

[0080] 9 Narrow Sides

[0081] 11 Longitudinal side

[0082] 12 Edge Area

[0083] 13 Folded edges

[0084] 14. Edge Area

[0085] 15 folds

[0086] 17 Arched

[0087] 18. Unloaded state

[0088] 19. Locations of plastic deformation

[0089] 20. Height of the arch

[0090] 21 Plate raw materials

[0091] 22 The highest point of the arch

[0092] 23 recess

[0093] 24. The lowest point of the arch

[0094] 25 grooves

[0095] 27 Bias

[0096] 29. The lower side of the bottom

[0097] 31. Middle of the tray

[0098] 33. The longitudinal direction of the elongated concave portion

[0099] 35. Length of the elongated concave portion

[0100] 37 Pallet depth

[0101] 39. Height of the offset

[0102] 41. Bottom thickness

[0103] 43 waist

[0104] 45 degrees

[0105] 47. Flat area

[0106] 49. Length of the straight region

[0107] 51 Waist length

[0108] 53. Spacing between the elongated recesses on the outside

[0109] 55 The spacing between the elongated recesses inside

[0110] L (vertical direction)

[0111] T Depth Direction

[0112] V represents the vertical direction.

Claims

1. A tray for a storage lift, having a bottom for placing stored items, wherein, The bottom is plastically deformable at at least one location spaced apart from at least one edge region, wherein, at at least one of the plastically deformed locations, the plate-like material forming the bottom is laterally pushed, causing the bottom to elongate in the longitudinal direction, resulting in an upward arching of the bottom in the vertical direction, since the bottom is prevented from expanding its area in the longitudinal direction and / or in the depth direction, wherein, in the case where just one arch exists, the uppermost point of the arch is located at the center of the tray.

2. The pallet according to claim 1, wherein, The bottom arches upwards when unloaded.

3. The pallet according to claim 1, wherein, The arched bottom is biased upward at at least one location that is plastically deformable.

4. The tray according to claim 1, wherein, The at least one portion that is plastically deformable is formed by an elongated concave portion.

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

6. The pallet according to claim 5, wherein, At least one of the elongated recesses has a length greater than 1 / 3 of the tray depth.

7. The tray according to claim 6, wherein, At least one bias height corresponds at most to the thickness of the bottom.

8. The pallet according to claim 1, wherein, The pallet is constructed as a bent part.

9. The tray according to claim 1, wherein, The at least one deformable portion is integrally constructed with the bottom of the tray.

10. The tray according to claim 1, wherein, The tray is rectangular and includes edges, wherein the edges of the rectangular tray are reinforced by folding the sheet material.

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

12. A method for manufacturing a pallet from a sheet-like raw material by molding, wherein, The bottom of the tray is plastically deformable at at least one location spaced apart from at least one edge region, wherein, at at least one of the plastically deformed locations, the plate-like material forming the bottom is laterally pushed, causing the bottom to elongate in the longitudinal direction, resulting in an upward arching of the bottom in the vertical direction, since the bottom is prevented from expanding its area in the longitudinal direction and / or in the depth direction, and in the case that just one arch exists, the uppermost point of the arch is positioned at the center of the tray.

13. The method according to claim 12, wherein, The upward arch of the bottom is created by plastically deforming at least one of the portions.

14. The method according to claim 12, wherein, At the at least one site of plastic deformation, the material at the bottom is pushed away from the at least one site of deformation.

15. The method according to claim 12, wherein, At least one pusher is pressed into the bottom from below at at least one location.

16. The method according to claim 12, wherein, The at least one portion is formed by deep drawing the bottom.

17. The method according to claim 12, wherein, After the at least one portion of the bottom has been plastically deformed, the sheet material is folded at at least one edge region.

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