DE19746142A1 - Plastics pallet - Google Patents

Abstract

The pallet is in the form of a rectangular hollow body with opposite side surfaces (14,16,18,29) having fork apertures (22,24,26,28). Closed loading surface (10), bottom (12) and a hollow frame structure are between the apertures and the loading surface. The hollow structure has hollow chambers (42,44) divided by dividing walls, so that the direction of the chambers and dividing walls in the four quadrants of the pallet changes by 90 deg from quadrant to quadrant.

Description

The invention relates to a pallet in the form of a rectangular plastic Hollow body with in two mutually perpendicular directions facing each other passages for forklift connecting opposite side surfaces ler forks in the area of the pallet near the floor, a smooth upper loading area che, a floor in the form of a frame following the edge of the pallet with an inscribed cross and a cavity structure in the upper part range of pallets between the culverts and the loading area.

Plastic pallets are known in various embodiments. Examples of such pallets are in WO 94/11262 and DE 93 18 328 U1 shown.

Because it is for reasons of material saving and weight are hollow body constructions, but on the other hand for reasons of Stability a diverse ribbing inside will be required numerous known embodiments with regard to demoldability made in two parts during injection molding, which are then welded or be glued. Connecting the two parts represents an additional one Operation that delays production and incurs additional costs gently.

The production of pallets in the form of hollow plastic parts in one Piece offers the possibility of the above-mentioned manufacturing technology to overcome part, but it is difficult in the one-piece production or even impossible, sufficient stability, especially flexural strength with respect to both horizontal central axes or side halves to achieve the pallet. A corresponding bending strength is in particular special requirements when using pallets in high-bay warehouses or the like, in which the pallets are only deposited on two side runners become. It can be done in the direction of one of the axes by appropriate Alignment of the ribs can achieve a high level of stiffness, however this results inevitably to a low rigidity across the ribs. An he increase the stiffness in both directions perpendicular to each other Difficulties with one-piece injection molded pallets mainly because the demoldability must be guaranteed.  

The invention has for its object a Darge plastic range created type that can be made in one piece and still a high Has stability and rigidity in all directions.

To achieve this object, the pallet according to the invention is characterized records that the cavity structure below the loading area of the four Side surfaces outgoing hollow chambers, which in all four Seitenflä Chen are arranged offset in the same direction to one side, so that the Direction of the cavities and partitions in the four quadrants of Pa lette changes from quadrant to quadrant by 90 °.

As a result, the hollow chambers in all four quadrants of the pallet and thus the partitions separating the hollow chambers, which the loading area support in the ver by 90 ° to the two neighboring quadrants set direction. The direction of the greatest bending load is thus arranged offset from quadrant to quadrant. As can be seen leaves, this leads to a bending behavior of the pallet, instead of on the center concentrated greatest deflection in conventional pallets a distribution of the deformation occurs over the four quadrants and quantita tiv is correspondingly lower.

Since the hollow chambers and their partitions with one and the same Rich device is only arranged in one of the quadrants, is the manufacturer possible with the help of sliders in an injection or pressing tool, without causing a conflict between parts of the tool and the Slider comes together.

As mentioned, the hollow chambers are located in the upper area of the pallet immediately below the loading area, while the passages for the fork tines in the lower area, i.e. below the hollow chambers. In the above The rest of the area is located on all four side surfaces hollow arranged in a cross shape along the two central axes rooms.

The floor preferably has a grid structure with Ra open from below compartments that extend to different heights. By doing The grid compartments are only flat from the floor area below the culverts  formed, while on the other hand the grid compartments in the middle of the pallet in the center of the cavities running in the two axes up to extend bar below the loading area.

A pallet according to the invention is produced, for example, from Recycled material consisting essentially of regrind from recycled bumpers likes of motor vehicles. This mass is made with long glass fibers from 12 to 50 mm offset, so that it turns out to be stiff and tough and egg has an increased modulus of elasticity. There are of course numerous others Materials can be used, however, the use of recycled material preferred because it ei the bumpers of scrapped vehicles leads to a meaningful reuse and other disposal makes dispensable.

The pallet is preferably not produced by injection molding, since this process can damage or even destroy the long glass fibers te. Rather, the material is preferably plasticized and as a strand in the Filled mold, which continues preferably from a lower tool and a flat plate as the upper tool. After filling the plasticized plastic mass, the plate-shaped upper tool is single Lich pressed, and the plasticized mass is pressed into all cavities.

The culverts are made with long and short slides that extend alternately to the middle on the one hand and to the adjacent one Extend slide on the other hand. Also for the side in the side panels staggered hollow chambers and the middle cavities in the Side surfaces are used sliders. Although sliders from four sides there is no overlap.

Preferred exemplary embodiments of the invention are described below the attached drawing explained.

Fig. 1 is a perspective view of an embodiment form of the pallet according to the invention looking towards the loading area;

Fig. 2 is a perspective view looking from the lower side of the pallet;

Fig. 3 is a partially broken and cut away view of the pallet.

Now the preferred embodiment of the invention will be explained with simultaneous reference to FIGS. 1 to 3.

Because of the difficulties, the complex spatial structure of the palette easy to understand, should then be described in particular Dimensions also the drawing can be consulted.

A pallet according to the invention has a closed upper loading surface 10 , a grid-shaped lower floor 12 and four, forming a rectangle Be tenflächen 14 , 16 , 18 , 20 . Each two opposite sides surfaces, namely the side surfaces 14 and 18 and the side surfaces 16 and 20 are connected by continuous passages 22 , 24 and 26 , 28 for the acquisition of forklift tines, not shown. In the four overlapping areas of these intersecting passages 22 , 24 , 26 , 28 , the bottom has rectangular openings 30 , 32 , 34 , 36 . This leaves for the bottom of a peripheral edge following the peripheral edge, not be individually marked and a cross inscribed therein, the legs of which extend in the direction of the two axes of the pallet. Such Pa letten are called window cross pallets. However, the invention is also applicable to so-called skid pallets or other pallet shapes. In the present context, axes are to be understood as the two center lines perpendicular to one another.

Above the cross, not designated here, which forms part of the floor surface, are below the loading surface 10 of all four side surfaces 24 , 16 , 18 , 20 in the middle of which cavities 38 , 40 , 42 , 44 enter, which are in a cross are arranged, but end in the central region of the pallet at a cavity that enters from the underside to the lower side of the loading area and is divided into four quadrants and is not designated.

While the passages 22 , 24 , 26 , 28 for the forklift tines each lie in the area of the pallet near the floor directly above the floor 14 , there are elongated hollow chambers 42 in the upper area below the loading area, divided by partitions, perpendicular to the corresponding side surfaces , 44 , which occur only on the left side of the respective side surface and each completely fill the area of a quadrant, using the example of FIGS. 1 and 2 approximately the quadrant, which is delimited at the front corner by the cavities 38 and 40 , and is not designated .

Since these hollow chambers 42 , 44 and their non-designated partition walls, which subdivide the hollow chambers into elongated spaces, alternately change their direction by 90 ° in the four successive quadrants in the circumferential direction, the four quadrants in the circumferential direction also change direction the highest bending stiffness. The interaction of the four quadrants results in a high flexural strength of the pallet in both axis directions with little deformation.

Insofar as the previously treated passages 22 , 24 , 26 , 28 , cavities 38 , 40 or hollow chambers 42 , 44 do not enter the side surfaces 14 , 16 , 18 , 20 , they are designed as closed surfaces. Behind these surfaces are in the upper area the parallel to these surfaces hollow chambers of the subsequent quadrant, in the lower area entering compartments of the bottom formed as a grid structure 12th

The passages 22 , 24 , 26 , 28 are bounded at the top by horizontal dividing walls 46 , 48 , 50 , 52 which are supported from below on the dividing walls of the hollow chambers 40 , 42 , which are not shown. Furthermore, the passages are closed by side walls 54 , 56 , provided that they do not overlap with other, perpendicularly extending passages.

It is obvious that the hollow chambers 42 , 44 can also be displaced to the right on the side surfaces, provided that this is done in the same direction in the circumferential direction for all side surfaces. In this way it is achieved that in the upper region of the pallet all slides can be pulled out to one side surface to egg ner side surface and overlaps between the sliders are avoided. In addition, it is achieved that the pallet is composed of quadrants in which the direction of the highest bending stiffness changes from quadrant to quadrant by 90 °. Overall, this results in a bending load that is not centered in the respective axis, but is distributed over a larger area of the pallet. The pallet is therefore highly stable regardless of the direction of loading.

In contrast to conventional pallets, the symmetry becomes the two Abandoned axes of the pallet. The range according to the invention is essentially Chen point or center symmetrical with respect to the center of the pallet te. The opposite quadrants can be mirrored in Look at the center of the palette.

The invention is also advantageous insofar as it is necessary for demolding conicity of the individual partitions or ribs inside the Pallet can not have a noticeable negative impact, since natural the direction of the taper also changes from quadrant to quadrant like the direction of the cavities.

The superposition of the upper and lower slide levels in connection with the described alignment of the passages and hollow chambers leads to a uniform wall thickness distribution in the four quadrants in the Interface between the two slide levels.

Claims (7)

1. Pallet in the form of a rectangular hollow plastic body with:

• - In two mutually perpendicular directions, the mutually opposite side surfaces ( 14 , 16 , 18 , 29 ) connecting passages ( 22 , 24 , 26 , 28 ) for forklift forks in the near-bottom region of the pallet;
• - A closed upper loading area ( 10 );
• - a bottom ( 12 ); such as
• a cavity structure in the upper region of the pallet between the passages ( 22 , 24 , 26 , 28 ) and the loading area ( 10 ),
  characterized by
• - That the cavity structure below the loading area ( 10 ) from the four side surfaces ( 14 , 16 , 18 , 20 ) outgoing, elongated, divided by partitions hollow chambers ( 42 , 44 ), so that the Rich direction of the hollow chambers and partitions in the four quadrants of the pallet change from quadrant to quadrant by 90 ° each.

2. Pallet according to claim 1, characterized in that the bottom ( 12 ) has a grid structure with grid compartments open from below. 3. Pallet according to claim 1 or 2, characterized in that the cavity structure in the middle of all side surfaces ( 14 , 16 , 18 , 20 ) entering cavities ( 38 , 40 ) in the upper region of the pallet below the loading area ( 10 ), which are arranged in a cross shape around the center of the pallet. 4. Pallet according to one of the preceding claims, characterized in that the bottom ( 12 ) is formed from a frame following the edge of the pallet and a cross inscribed therein and in the overlapping areas of the passages ( 22 , 24 , 26 , 28 ) rectangular Has openings ( 30 , 32 , 34 , 36 ). 5. Pallet according to one of the preceding claims, characterized by horizontal partitions ( 46 , 48 , 50 , 52 ) which close off the passages ( 22 , 24 , 26 , 28 ) in the direction of the hollow chambers ( 42 , 44 ). 6. Pallet according to one of the preceding claims, characterized in that the passages ( 22 , 24 , 26 , 28 ) are limited by side walls, provided that they do not overlap with the transversely extending passages. 7. A method of manufacturing a pallet according to any one of claims 1 to 6, characterized in that a plastic recycling material milled len is that the material long glass fibers with a length in the order of magnitude voltage of 12 to 50 mm are added that the plastic material as pla Stified strand is filled into a lower tool and that the material then through an upper tool designed as a flat plate into the Cavities of the lower tool is pressed.