DE9010271U1 - Beam for a flat pallet - Google Patents

Description

The invention relates to a beam for a flat pallet, which has a substantially rectangular or square cross-section and an upper surface which can be connected to the support plate of the flat pallet and a surface which forms the support surface.

Such beams for wooden flat pallets are usually made from strip- or beam-shaped wooden sections that are nailed or screwed under the support plate of the flat pallet so that the upper surface of the beam rests on the lower side of the support plate, whereby the support plate forms a continuous surface, but can also consist of individual parts that are spaced apart from one another. The support plate is provided with at least two beams so that the flat pallet rests on the floor or similar with the lower surfaces of the beams and a forklift with the arms of a transport fork can drive into the space between the floor and the support plate and lift the flat pallet and transport it to another location.

Such flat wooden pallets are common, but have the disadvantage that they are relatively unsuitable as disposable pallets for many applications because they

are very difficult to eliminate. This problem occurs, for example, in retail, where goods are delivered on flat pallets that the deliverer cannot immediately remove because the goods are initially stored by the retailer on the flat pallet.

*i” is the task of the invention to create a possibility to make a flat pallet simple, inexpensive and easily disposable.

To solve this problem, a beam for a flat pallet is designed in such a way that its upper surface is formed by an upper wall and its support surface by a lower wall of a tubular cardboard element into which at least two hard paper sleeves are inserted at a distance from one another, which rest with their upper ends on the inside of the upper wall and with their lower ends on the inside of the lower wall.

The beam according to the invention therefore does not consist of solid material, but essentially of a tubular cardboard element and at least two hard paper sleeves, i.e. of materials that can be easily removed, so that when using such a beam and, for example, a support plate made of corrugated cardboard, a fish pallet is obtained which is much more advantageous to use as a disposable pallet than a flat pallet made of wood. The inherent difficulty of giving a cardboard beam sufficient strength to absorb the high forces generated by the high weight of the goods resting on the flat pallet is eliminated by inserting at least two hard paper sleeves into the tubular, i.e. hollow, cardboard element with their longitudinal axes in the direction of the load, i.e. with their upper ends on the upper wall and with their lower walls on the lower wall, into the beam, so that a very stable support is obtained, since the hard paper sleeves can absorb extremely high forces in the direction of their longitudinal axis and are also extremely stable against lateral deformation. The upper

and the lower wall, which rest on the hard paper tubes, are continuously supported by them, whereby the distances between adjacent hard paper tubes are selected so that sufficient strength is also present in the intermediate areas between them.

In one embodiment of the invention, recesses extending over the entire height are provided in the area of the hard paper sleeves in the side walls connecting the upper and lower walls, and the outer diameter of the hard paper sleeves is larger than the width of the cardboard outer part, with the hard paper sleeves projecting through the recesses over the side walls.

With such a structure, on the one hand, hard paper tubes with a relatively large diameter and thus considerable strength can be used, and on the other hand, the hard paper tubes are positioned in the axial direction by the recesses in the side walls. In addition, this structure prevents the tubular cardboard element from collapsing under shear forces acting along the longitudinal axis, especially when the vertical edges of the opposite recesses are on the circumference of the associated

( Hard paper sleeve.

In order to transfer the forces occurring in such a structure evenly to the wall of the hard paper tubes, the upper and lower walls of the cardboard element in the area of the hard paper tubes can have wall projections that cover their protruding areas.

The beam can be easily manufactured if the cardboard element is made from a one-piece cardboard cut-out folded along fold lines running parallel to its longitudinal axis.

When manufactured from such a one-piece blank, the cardboard element can have a double-layered wall, whereby this is preferably the lower wall, since this is exposed to higher heat loads than the upper wall due to contact with the ground, for example due to unevenness of the surface on which the flat pallet is divided, moisture or the like.

Glue can be used to connect the wall sections of the double-layer wall of the folded cardboard cut-out. However, it is also possible to connect the two wall sections together using staples.

In order to prevent the flat pallet from being damaged by a fork of a forklift truck or the like being driven into the tubular cardboard element of the flat pallet, the ends H ^: of the cardboard element of the beam according to the invention can be closed. %

The cardboard element is preferably made of solid cardboard, because |

this is well resistant to moisture, thus the strength |

of the spar itself is not significantly impaired,

The hard paper cores are cores that are usually used as cores for roll paper. They can be made of spirally wound solid cardboard.

In order to achieve sufficient strength of the hard paper sleeve in relation to the expected loads of the entire beam, the wall thickness of the hard paper sleeve is preferably greater than the wall thickness of the side walls of the cardboard element.

The invention is explained in more detail below using the figures showing an embodiment:

Figure 1 shows a simplified perspective view of a flat pallet with two beams on which a support plate is attached.

*> Figure 2 shows a hard paper sleeve.

Figure 3 shows a blank for producing a tubular cardboard element.

Figure 4 shows in perspective the folding of the blank with inserted hard paper tubes into a spar

15

Figure 5 shows the spar manufactured according to Figure 4, with the ends not yet closed.

The flat pallet shown in Figure 1 has two beams 1, 1' arranged at a distance from each other and running parallel to each other, on the upper surfaces of which a support plate 2, made of corrugated cardboard, is attached. This attachment can, for example,

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The two beams 1, 1' are constructed in the same way, and below only the construction of beam 1 will be explained in detail.

To produce the beam 1, a blank 100, made of solid cardboard, for example, is used, as shown in Figure 3. This blank has a central section 10 which later forms the upper wall, to which side sections 11, 12 are connected via fold lines, both of which have the same width (= distance between adjacent fold lines) and later form the side walls of the beam. A section 13 is connected to the side section 11 via a fold line and a section 14 is connected to the side section 12 via a fold line. These two sections are the same width and have the same width as the central section 10.

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They later form a double-layered lower wall of the beam 1.

In the side sections 11 and 12 there are pairs of cutouts 15, 16 and 17, 18 which extend essentially between the adjacent fold lines. At their ends lying on the fold lines there are arcuate projections 19, 20, 25, 26 which form part of the central section 10, 21, 27 which form part of section 13 and 22, 28 which form part of section 14. On section 13 there are correspondingly shaped projections 23 and 29 opposite these projections 21 and 27 on the free longitudinal edge, and correspondingly projections 24 and 30 are present on section 14.

In the side section 11, on the fold line connecting this sexton section 11 with section 13, between the recesses 15 and 17, there are small recesses 31 and 32, the function of which will be explained later.

The ends of the side section 12 are connected via fold lines to cover sections 33 and 34 sn, to which insert sections connected via fold lines are formed on all sides.

In order to form a beam from the blank 100 according to Figure 3, two hard paper sleeves 3 are used, as shown in Figure 2. The hard paper sleeves have an outer diameter D, which can be 98 mm, for example, and a wall thickness d that is greater than the material thickness of the solid cardboard that was used for the one-piece blank 10. The wall thickness is 4 mm, for example. The length of the hard paper sleeve 1 corresponds to the width of the side sections 11, 12 of the blank 10, i.e. the distance between the fold lines delimiting these side sections 11, 12. It can be 110 mm, for example.

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As Figure 4 shows, to produce the spar 1, two hard paper sleeves 3 are placed on the middle section 10 in the area of the projections 19, 20 and 25, 26, the outer diameter D of which is larger than the width of the middle section 10 between the fold lines that delimit it. The side sections 11, 12 are now folded around the fold lines between them and the middle section 10, and the sections 13, 14 are folded in the same direction (Figure 4), so that the side sections 11, 12 approach the hard paper sleeves 3 and these reach the area of the recesses 15, 16 and 17, 18 respectively. The sections 13 and 14 are brought together in such a way that section 13 lies above section 14. This folding then produces a tubular cardboard element with inserted hard paper sleeves 3, some of which protrude beyond the side walls, as shown in Figure 5. In order to connect the sections 13 and 14, a clamping device can be used to reach through the recesses 31 and 32 in the side wall formed by the side section 11 and a connection can be made by driving in clamps. It should be mentioned that the sections 13 and 14 can also be connected using a quick-setting adhesive to form the lower wall of the beam 1.

In this construction, as can be seen from Figure 5, the projections 21 and 23 of section 13 and the underlying projections 22 and 24 of area 14 cover the laterally protruding part of the upper edge of the front hard paper sleeve 3 in Figure 5, while the laterally protruding part of the lower edge of this hard paper sleeve is covered by the sections 19 and 20. Accordingly, the laterally protruding parts of the upper edge of the rear hard paper sleeve 3 are covered by the projecting areas 27 and 29 of section 13 and the projections 28 and 30 of section 14, while the covering of the laterally protruding parts of the lower edge is done by the projections 25 and 26 of the middle section 10.

The lateral projection of the hard paper sleeve 3 can be, for example, 7.5% to 15%, preferably 10% of the width of the central section 10 on each side.

To complete Holm 1, »the De

cuts 33 and 34 with their inwardly folded insert cuts are pivoted so that the insertion sections are located inside the tubular cardboard element formed and the cover sections 33 and 34 are aligned with the end edges of the cardboard element. In this position, the cover sections 33 and 34 can be fixed in place by means of an adhesive previously applied to the outer surfaces of the insertion sections, which hardens when inserted.

The finished beam 1 has two side walls formed by the side sections and a wall between them which is formed from two sections 13, 14. This double-layer wall serves as the lower wall in the assembled state, so that the beam 1 is attached to the support plate 2 with the outside of its upper wall formed by the middle section 10, while the double-layer wall made up of sections 13 and 14, as can be seen from Figure 1, is located on the underside of the beam 1.

Claims (13)

1. Beam for a flat pallet, which has a substantially rectangular or square cross-section, an upper surface which can be connected to the support plate (2) of the flat pallet, and a lower surface which forms the support surface. This is characterized in that the upper surface is formed by a high wall (10) and the support surface by a lower wall ( 13, 14) of a tubular cardboard element, in which at least two hard paper sleeves (3) are inserted at a distance from one another, which rest with their upper ends on the inside of the upper wall (10) and with their lower ends on the inside of the lower wall (13, 14). 2. Beam according to claim 1, characterized in that in the region of the hard paper sleeves (3) in the side walls (11, 12) connecting the upper and lower walls (10; 13, 14) there are recesses (15, 17; 16, 18) extending over the entire height, that the outer diameter (C) of the hard paper sleeves (3) is greater than the width of the cardboard element and that the hard paper sleeves (3) protrude through the recesses (15, 16; 17, 18) over the side walls (11, 12). 3. A spar according to claim 2, characterized in that the vertical edges of the opposing recesses (15, 16; 17, 18) rest on the circumference of the associated hard paper sleeve (3). 4. Beam according to claim 2 or 3, characterized in that the upper and lower walls (10; 13, 14) in the region of the hard paper sleeves (3) have wall projections (19, 20; 25, 26; 21, 23; 22, 24; 27, 29; 26, 28) covering the projecting regions. 5. Holm according to one of claims 1 to 4, characterized in that the PaDDelernent consists of a r·· A one-piece folding blank (100) is produced using fold lines running along the longitudinal axis. 6. Holm according to claim 5, characterized in that the cardboard element has a double-layered wall (13, 14). 7. Beam according to claim 6, characterized in that the double-layered wall is the lower wall (13, 14). 8. Beam according to claim 6 or 7, characterized in that the wall sections (13, 14) of the double-layer wall are connected to one another by adhesive bonding. 9. Beam according to claim 6 or 7, characterized in that the wall sections (13, 14) of the double-layered wall are connected to one another by stapling. 10. Beam according to one of claims 1 to 9, characterized in that the ends of the cardboard element are closed. 11. Beam according to one of claims 1 to 10, characterized in that the cardboard element consists of solid cardboard. 12. Beam according to one of claims 1 to 11, characterized in that the hard paper sleeve (3) consists of spirally wound solid cardboard. 13. Beam according to one of claims 1 to 12, characterized in that the wall thickness (d) of the hard paper sleeves (3) is greater than the wall thickness of the side walls (11, 12) of the cardboard element.