EP1266835A1

EP1266835A1 - Modular pallet

Info

Publication number: EP1266835A1
Application number: EP01113756A
Authority: EP
Inventors: Ali Asghar Hariri
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-06-05
Filing date: 2001-06-05
Publication date: 2002-12-18

Abstract

A pallet for supporting freight, goods or other materials is transportable by a lifting mechanism and comprises a plurality of first segments (10) made of a synthetic material and having a substantially oblongness form defined by a longitudinal edge (1) and a narrow edge (2). The first segments (10) have upper surfaces defining a supporting plate (3). Each of the first segments (10) comprises at least two openings (11) extending in transverse direction thereof. The first segments (10) are arranged side by side in such a way that the openings (11) are in alignment and define a passage. A rod (30) is introduced into the respective passage and is provided with fastening means (31, 32, 33, 34) at its respective ends for fastening the first segments (10) therebetween.

Such a pallet has a modular design, which allows an easy and quick assembly of the pallet in different dimensions.

Description

The present invention generally relates to a pallet for supporting freight, goods or other materials and more particularly to a pallet being transportable by a lifting mechanism.
There are a wide variety of pallets available for supporting materials above the ground and for transporting these materials from place to place. These pallets are generally adapted for use with lifting mechanism such as forklifts. Forklifts facilitate the transportation of materials placed on the pallets from one location to another by inserting its forks into channels beneath the surface of the pallet.
Most commercially available pallets are typically made of wood, since in the past, wooden pallets have provided advantages of economy. However, wooden pallets are heavy; are subject to warpage, splintering and splitting; are nonuniform in strength; and gain significant weight when wet. Moreover, wooden pallets are unsatisfactory regarding natural deficiencies, such as the limitation of natural resources; have a poor chemical resistance; and are comparatively complicated to manufacture.
Metallic pallets are also available, but they are expensive and typically heavy and subject to corrosion. Therefore, metallic pallets are inadequate for supporting certain goods, for instance in the foodstuff industry or pharmaceutical industry.
In the past decades, a wide variety of pallets made of a synthetic material such as plastics have been designed. Plastic pallets can easily be moulded and are stronger, lighter in weight, and more durable than for instance wooden pallets. Usually, plastic pallets are formed from upper and lower halves of identical construction. The two identical halves are formed in a single mould and, then, assembled to each other in face-to-face relationship to form the completed pallet. Consequently, an enormous moulding machine is required to mould a pallet having large dimensions. Therefore, such a pallet is typically quite expensive.
Although, while a number of plastic pallets have been proposed, there remains a need for a plastic pallet that is light in weight, durable, capable of supporting heavy loads and, above all, is easy and economical to manufacture and have a minimum number of parts that are preferably exchangeable, for example in case of damage.
It is the object of the present invention to provide a pallet that has a modular design allowing an easy and quick assembly of the pallet in different dimensions.
In order to accomplish the above object, the present invention provides a pallet for supporting freight, goods or other materials, particularly being transportable by a lifting mechanism, that comprises a plurality of first segments made of a synthetic material and having a substantially oblongness form defined by a longitudinal edge and a narrow edge, wherein the first segments have upper surfaces defining a supporting plate, wherein each of the first segments comprises at least two openings extending in transverse direction thereof and in particular being arranged parallel to each other, wherein the first segments are arranged side by side in such a way that the respective openings are in alignment and defining a passage, and wherein a rod is introduced into the respective passage and is provided with fastening means at its respective ends for fastening the first segments therebetween.
Such a pallet consists of a plurality of identically shaped first segments that are secured together by the rod. Thus, a modular design is achieved allowing to modify the pallet regarding various dimensions by addition or removal of a appropriate number of first segments. Since the first segments are designed as modular units having a substantially oblongness form, moreover, mould costs could be minimized. Furthermore, the rod securing the first segments together ensures an easy and economical assemblage.
In accordance with a preferred embodiment of the present invention, the respective rod is made of steel or a synthetic material depending on the loads the pallet is used for. Further in accordance with a preferred embodiment of the present invention, the fastening means is a screw connection consisting of a screw and a threaded hole in the respective end faces of the rod. Such a fastening means is both simple in construction and reliable in securing. Preferably, the screw connection comprises a flat washer and a spring washer that are arranged between the screw and an opposing front face of the outer ones of the first segments in order to enhance the strength of the pallet.
Still further in accordance with a preferred embodiment of the present invention, each of the first segments comprises several, in particular at least three, openings that are arranged parallel, wherein a corresponding number of rods is provided. In this manner, the force tightening up the first segments can significantly be increased. Preferably, three openings are provided, wherein one of the openings is located in the centre and the two other openings are arranged in the region of the respective ends of the first segments. Such an arrangement ensures an equal spreading of the forces caused by the fastening means along the longitudinal edge of the first segments.
According to another embodiment of the present invention, the first segments have plane areas surrounding the openings and protruding outwardly from the front face and an opposing back face of the first segments that extends parallel to the front face along the longitudinal edge. In this manner, there are provided supporting surfaces between the first segments, which assure an exact arrangement of the first segments. In another aspect of the present invention, each of the first segments is provided with two spaced apart recesses defining a fork-inserting mouth on the longitudinal edge for receiving a pair of laterally separated forks of a lifting mechanism. Such an construction is adapted for use with lifting mechanism such as forklifts. As regards a favourable structure, preferably, each of the recesses is arranged between two adjacent openings.
In a preferred embodiment, the first segments are provided with numerous ribs that are integrally formed on the front face and on the back face for reinforcing the first segments. With regard to a lightweight construction, preferably, the first segments have a hollow interior. The hollow interior can be divided by walls in order to increase the stiffness of the first segments. Furthermore, the supporting plate can be provided with a plurality of bores, spots and/or buttons. In this case, the bores, spots and buttons can be used for attaching loads on the supporting plate.
In line with a preferred embodiment of the present invention, spacers separate the first segments. A pallet having such a configuration is adequate for transporting light loads. Preferably, the spacer is a tube that embraces the rod between two contiguous first segments, thereby ensuring an easy assemblage. Regarding a lightweight and low-priced construction, the spacer can be made of a synthetic material.
According to another embodiment of the present invention, there are provided second segments that are made of a synthetic material and have a form substantially similar to that of the first segments, wherein the second segments have a shorter height than that of the first segments and are arranged between the first segments in such a way that a fork-inserting mouth is defined beneath the second segments on the narrow edge. In this way, a fork-inserting mouth is provided on each of all four sides of the pallet.
Moreover, in accordance with a preferred embodiment of the present invention, at least one bottom plate is arranged on the underside of the first segments and/or the second segments in direction of the narrow edge. The bottom plate improves the stability of the pallet. In connection with an easy assemblage, preferably, the bottom plate is a frame that has cross connections spaced apart in a distance corresponding to the width of the first segments or the second segments. In this manner, there is provided a bottom plate having a relative small weight and being sufficiently robust. Additionally, the bottom plate can have at least one bridge between two adjacent cross connections in order to increase the rigidity of the bottom plate.
The various features and advantages of the present invention may be more readily understood with reference to the following detailed description taken in conjunction with the accompanying drawings, wherein like reference numerals designate like parts, and in which:

FIG. 1: is a schematic view showing a pallet consisted of a plurality of first segments according to a first embodiment of the present invention;
FIG. 2: is a schematic view showing a pallet consisted of a plurality of first segments that are spaced apart by spacers according to a second embodiment of the present invention;
FIG. 3: is a schematic view showing a pallet consisted of a plurality of first segments and second segments according to a third embodiment of the present invention;
FIG. 4: is a schematic view showing the pallet of FIG. 3 along with a number of bottom plates according to a fourth embodiment of the present invention.

Reference is now made to FIG. 1, which illustrates a pallet consisting of a plurality of first segments 10. The first segments 10 are made of a synthetic material, i. e. a polymer, by injection moulding. Each of the first segments 10 has a substantially oblongness form, which is defined by a longitudinal edge 1 and a narrow edge 2. The first segments 10 are arranged alongside in such a way that they abut against each other along the longitudinal edge 1. An upper surface of the first segments 10 defines a supporting plate 3 for supporting loads such as freight, goods or other materials. The supporting plate 3 is provided with a plurality of bores 19, which can be used for attaching the loads thereon. In addition to the bores 19 or as an alternative thereto, spots and/or buttons may be provided.
As further shown in FIG. 1, the first segments 10 comprise numerous ribs 16 integrally formed on a front face 12 and a back face 13, which extend parallel in direction of the longitudinal edge 1. The ribs 16 serve to reinforce the first segments 10. Furthermore, the first segments 10 are provided with a hollow interior 17 ensuring a lightweight construction. The hollow interior 17 is divided by walls 18 into several chambers, thereby increasing the stiffness of the first segments 10.
Each of the first segments 10 comprises three openings 11, which extend in transverse direction thereof and are arranged parallel. One of the openings 11 is located in the centre and the two other openings 11 are arranged in the region of the respective ends of the first segments 10. The openings 11 of the first segments 10 arranged side by side are in alignment. Thus, three parallel passages are defined. A rod 30 made of steel or an appropriate synthetic material is introduced into each passage and is provided with fastening means. The fastening means are a screw connection that consists of a screw 31 and a threaded hole 32 in the respective end faces of the rods 30. Moreover, the screw connection comprises a flat washer 33 and a spring washer 34 that are arranged between the screw 31 and the respective opposing front face 12 of the outer ones of the first segments 10. The rods 30 along with the screw connection at their respective ends serve to secure the first segments 10 together. In this manner, an easy and economical assemblage of the pallet is achieved.
The first segments 10 further comprise plane areas 14, which surround the openings 11 and protrude outwardly from the front face 12 and the back face 13, respectively. The plane areas 14 represent supporting surfaces between the first segments 10, thereby ensuring an exact arrangement of the first segments 10 in their side-by-side arrangement. Additionally, each of the first segments 10 is provided with two spaced apart recesses 15. The recesses 15, each of them is arranged between two adjacent openings 11, define a fork-inserting mouth 4 on the longitudinal edge 1 of the first segments 10 for receiving a pair of laterally separated forks of a lifting mechanism, i. e. a forklift. By providing such a fork-inserting mouth 4, the pallet can easily be transported from one place to another.
Turning now to FIG. 2, a variation of the above described pallet is illustrated. While the pallet shown in FIG. 1 serve for supporting heavy loads, the pallet according to FIG 2. is mainly suited for goods having a low weight. The pallet consists of first segments 10 and spacers 40 that separate the first segments 10 in direction of the narrow edge 2. The spacers 40 made of a synthetic material are formed as tubes that embrace the rods 30 and are arranged between two contiguous first segments 10. By providing the spacers 40 between the first segments 10, the pallet has a comparatively low tare.
FIG. 3 illustrates an embodiment of a pallet, which is similar to the pallet according to FIG 1. As shown in FIG. 3, the pallet consists of a plurality of first segments 10 and second segments 20. The second segments 20 are made of a synthetic material, e. g. a polymer, and have a form substantially comparable to that of the first segments 10. Consequently, the second segments 20 also comprise openings 21, plane areas 24, ribs 26, an hollow interior 27, walls 28 dividing the hollow interior 27, and bores 29 on the upper surfaces thereof. As opposed to the first segments 10 having a height h₁ perpendicular to the longitudinal edge 1 or the narrow edge 2, the second segments 20 have a height h₂ that is shorter than the height h₁ of the first segments 10. To be precise, the second segments 20 correspond to the first segments 10 without the portion having the recesses 15. The second segments 20 are arranged between the first segments in such a way that a fork-inserting mouth 5 is defined beneath the second segments 20 on the narrow edge 2. In this way, there are provided fork-inserting mouths 4, 5 on each of all four sides of the pallet.
Reference is finally made to FIG. 4, which illustrates a pallet equivalent to that according to FIG. 3. The pallet according to FIG. 4 comprises additionally a plurality of bottom plates 50, which are attached to the underside of the first segments 10 and the second segments 20 in direction of the narrow edge 2. The bottom plates 50 improve the stability of the pallet and are configured as a frame that has cross connections 51 spaced apart in a distance corresponding to the width of the first segments 10 and the second segments 20. By forming the bottom plates 50 as frame having cross connections 51, the bottom plates 50 have a relative small weight and are sufficiently robust. Moreover, the bottom plates 50 have a bridge 52 between two adjacent cross connections 51 in regions of the bottom plates 50 attaching to the second segments 20. The bridges 52 serve to increase the rigidity of the bottom plates 50.
In summary, the various embodiments of a pallet discussed above have in common that they are relatively light in weight, durable, and capable of supporting loads by a lifting mechanism such as forklifts. Furthermore, the various embodiments of a pallet are easily and economically to manufacture and have a minimum number of parts, thereby ensuring a quick assembly. Last but not least, the several parts of the various embodiments of a pallet, in particular the first segments 10 and the second segments 20, represent modular units and, therefore, are easily to exchange, for example in case of damage.

List of reference signs

1: longitudinal edge
2: narrow edge

3: supporting plate

4: fork-inserting mouth
5: fork-inserting mouth

10: first segment
11: opening
12: front face
13: back face
14: plane area
15: recess
16: rib
17: hollow interior
18: wall
19: bore

20: second segment
21: opening
24: plane area
26: rib
27: hollow interior
28: wall
29: bore

30: rod
31: screw
32: threaded hole
33: flat washer
34: spring washer

40: spacer

50: bottom plate
51: cross connection
52: bridge

h₁: height
h₂: height

Claims

A pallet for supporting freight, goods or other materials, particularly being transportable by a lifting mechanism, comprising:

a plurality of first segments (10) made of a synthetic material and having a substantially oblongness form defined by a longitudinal edge (1) and a narrow edge (2);

said first segments (10) having upper surfaces defining a supporting plate (3);

each of said first segments (10) comprising at least two openings (11) extending in transverse direction thereof;

said first segments (10) being arranged side by side in such a way that the respective openings (11) being in alignment and defining a passage; and

a rod (30) being introduced into the respective passage and being provided with fastening means (31, 32, 33, 34) at its respective ends for fastening said first segments (10) therebetween.
A pallet according to claim 1,
characterised in that the respective rod (30) is made of steel or a synthetic material.
A pallet according to claim 1 or 2,
characterised in that said fastening means is a screw connection consisting of a screw (31) and a threaded hole (32) in the respective end faces of said rod (30).
A pallet according to claim 3,
characterised in that said screw connection comprises a flat washer (33) and a spring washer (34) that are arranged between said screw (31) and an opposing front face (12) of the outer ones of said first segments (10).
A pallet according to any of the claims 1 to 4,
characterised in that each of said first segments (10) comprises at least three openings (11) that are arranged parallel, wherein a corresponding number of rods (30) is provided.
A pallet according to claim 5,
characterised by three openings (11), wherein one of said openings (11) is located in the centre and the two other openings (11) are arranged in the region of the respective ends of said first segments (10).
A pallet according to claim 5 or 6,
characterised in that said first segments (10) have plane areas (14) surrounding said openings (11) and protruding outwardly from said front face (12) and an opposing back face (13) of said first segments (10) that extends along said longitudinal edge (1).
A pallet according to any of the claims 1 to 7,
characterised in that each of said first segments (10) is provided with two spaced apart recesses (15) defining a fork-inserting mouth (4) on said longitudinal edge (1) for receiving a pair of laterally separated forks of a lifting mechanism.
A pallet according to claim 8,
characterised in that each of said recesses (15) is arranged between two adjacent openings (11).
A pallet according to any of the claims 1 to 9,
characterised in that said first segments (10) are provided with numerous ribs (16) being integrally formed on said front face (12) and on said back face (13) for reinforcing said first segments (10).
A pallet according to any of the claims 1 to 10,
characterised in that said first segments (10) have a hollow interior (17).
A pallet according to claim 11,
characterised in that said hollow interior (17) is divided by walls (18).
A pallet according to any of the claims 1 to 12,
characterised in that said supporting plate (3) is provided with a plurality of bores (19).
A pallet according to any of the claims 1 to 13,
characterised in that said first segments (10) are separated by spacers (40).
A pallet according to claim 14,
characterised in that said spacer (40) is a tube embracing said rod (30) between two contiguous first segments (10).
A pallet according to claim 14 or 15,
characterised in that said spacer (40) is made of a synthetic material.
A pallet according to any of the claims 1 to 16,
characterised by second segments (20) made of a synthetic material and having a form substantially similar to that of said first segments (10), said second segments (20) having a shorter height (h₂) than that (h₁) of said first segments (10) and being arranged between said first segments (10) in such a way that a fork-inserting mouth (5) is defined beneath said second segments (20) on said narrow edge (2).
A pallet according to any of the claims 1 to 17,
characterised in that at least one bottom plate (50) is arranged on the underside of said first segments (10) and/or said second segments (20) in direction of said narrow edge (2).
A pallet according to claim 18,
characterised in that said bottom plate (50) is a frame having cross connections (51) spaced apart in a distance corresponding to the width of said first segments (10) or said second segments (20).
A pallet according to claim 19,
characterised in that said bottom plate (50) has at least one bridge (52) between two adjacent cross connections (51).