JP2005041497A - Pallet for forklift - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new pallet for a forklift which can ensure an enough strength without generating problems on damage and hygienics, and can be relatively inexpensively provided. <P>SOLUTION: The pallet A for the forklift is equipped with a plurality of top face panels 1 with a specified thickness and a long rectangular shape arranged in parallel, a plurality of bottom face panels 2 similarly with a specified thickness and a long rectangular shape arranged in parallel, and a plurality of intermediate members 3 for connecting and supporting a plurality of the top face panels 1 and a plurality of the bottom face panels 2 through a specified gap. As the whole or parts of a plurality of the top face panels 1 and a plurality of the bottom face panels 2, a metal-reinforced resin panel material 10 comprising a metal core material 20 formed into a corrugated panel and a resin 30 including this core material 20, and whose site including the core material 20 exhibits a uniform crosssection in the longitudinal direction, is used. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a forklift pallet.
[0002]
[Prior art]
In factories and the like, forklifts are frequently used for loading and unloading loads, for example, and for transferring loads in the factory. In order to use this forklift, a pallet for forklift (hereinafter simply referred to as “pallet”) is essential. This pallet has a flat load placement surface, and a pair of fork claws can be inserted from the side. The load is moved using a forklift while being placed on the pallet. That is, the pallet on the floor, platform, or truck bed is inserted with a fork claw from the side and lifted by raising the fork claw, and the forklift travels in this state. Moved. The fork claw moves up and down according to the height of the moving destination, and after the pallet is grounded to the moving destination, it is pulled out to the side.
[0003]
Such pallets are generally wooden. The reason for this is thought to be that it is relatively lightweight, that the surface is relatively soft, so that it is less likely to damage the load, and that it is relatively inexpensive.
[0004]
However, such a pallet is handled by a forklift with a relatively high horsepower while carrying a heavy load, so in the case of wood, damage such as pulling out a nail, flapping the surface, peeling off a piece of wood, etc. Prone to occur. In particular, neglecting surface puddles and strips of wood can cause even hygiene problems and water wetting can accelerate such hygiene problems. As a result, wooden pallets must be replaced in a relatively short period of time.
[0005]
For example, Patent Document 1 proposes a part of a pallet made of resin for protection of wood resources. Japanese Patent Application Laid-Open No. H10-228667 proposes a pallet made entirely of resin.
[0006]
[Patent Document 1]
JP 2001-114281 A [Patent Document 2]
JP 2001-88834 A
[Problems to be solved by the invention]
However, in the pallet described in Patent Document 1, the plates that form the upper and lower load placement surfaces are made of wood, and the plate members constituting the upper and lower load placement surfaces are formed in the vertical direction so as to form a fork claw insertion space. In this case, only the intermediate member for connecting with a gap is formed of resin, and this does not solve the problem of severe damage to the load placement surface and corners.
[0008]
In addition, the pallet described in Patent Document 2 is entirely made of resin, and even if the problems such as surface rolling and peeling can be solved, there is anxiety in terms of strength, and a complicated molding die is produced. This is disadvantageous in terms of cost.
[0009]
The present invention has been conceived under the circumstances described above, and can provide sufficient strength without causing damage or sanitary problems, and can be provided at a relatively low cost. The challenge is to provide a new forklift pallet that can be used.
[0010]
DISCLOSURE OF THE INVENTION
In order to solve the above problems, the present invention employs the following technical means.
[0011]
That is, the forklift pallet provided by the present invention is provided with a plurality of long rectangular upper surface plates having a predetermined thickness, and a plurality of long rectangular lower surface plates having the same thickness. A forklift pallet comprising a plurality of intermediate members for connecting and supporting the face plate and the plurality of lower face plates via a predetermined gap, all or part of the plurality of upper face plates and the plurality of lower face plates Includes a metal core material formed in a corrugated plate shape and a resin containing the core material, and a metal reinforced resin plate material in which the part including the core material has a uniform cross section in the longitudinal direction is used. It is characterized by.
[0012]
In a preferred embodiment, at least one of the plurality of upper surface plates positioned at both ends and the plurality of the lower surface plates positioned at both ends are the metal reinforced resin plate materials.
[0013]
In a preferred embodiment, the metal reinforced resin sheet has a covering material bonded or welded to both ends thereof.
[0014]
The metal reinforced resin plate material includes a corrugated metal core material having a uniform cross section in the longitudinal direction. Therefore, the bending rigidity in the longitudinal direction is remarkably high, and high strength as a whole plate material can be ensured. In addition, since such a metal reinforced resin plate material is formed of PP, PE, or a foamed thermoplastic resin, the problem of scratching the load does not occur. In addition, since the surface is a resin surface, there is no problem such as rolling and peeling as in the case of wood.
[0015]
Further, as described above, in the metal reinforced resin plate material forming the upper surface plate or the lower surface plate of the forklift pallet of the present invention, at least a portion including the corrugated plate material has a uniform cross section. Thereby, this metal reinforced resin board | plate material can be manufactured at low cost by the following processes, As a result, the pallet for forklifts of this invention can be provided cheaply.
[0016]
That is, a metal strip obtained at a relatively low cost in a roll state is gradually formed into a corrugated plate with a uniform cross section by a forming roller or the like while being conveyed in the longitudinal direction, and the corrugated metal strip is extruded with resin. While continuously inserting into the die of the forming machine from its rear end, a resin molded product in which the resin of the cross section according to the outlet shape of the die is coated around the corrugated metal strip is continuously formed. Then, such a continuous resin molded product is cut into predetermined lengths to obtain the metal reinforced resin plate material, and the cut surface of the metal reinforced resin plate material is covered with a resin coating material as necessary. In this way, the metal reinforced resin plate material can be efficiently manufactured, and the cost can be reduced.
[0017]
Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the drawings.
[0018]
[Preferred Embodiment]
Hereinafter, a preferred embodiment of the present invention will be specifically described with reference to the drawings.
[0019]
FIG. 1 shows the overall appearance of an embodiment of a forklift pallet A according to the present invention. The overall configuration of the pallet A is the same as that of a conventional wooden pallet. That is, the pallet A is preferably provided with a plurality of long rectangular upper surface plates 1 having a predetermined thickness, and a plurality of long rectangular lower surface plates 2 having a predetermined thickness. As a whole, it has a substantially square shape in plan view. In the illustrated example, each of the upper surface plate 1 and the lower surface plate 2 includes six sheets.
[0020]
The six upper plates 1 and the six lower plates 2 are connected and supported on the upper and lower surfaces of the three intermediate members 3. That is, the three intermediate members 3 are rod-like members having a rectangular cross section having the same length as the dimension of the upper and lower plate in the juxtaposed direction, and the upper and lower surfaces of the first intermediate member 3a One end portions of the face plate 1 and the lower surface plate 2 are connected and supported, and the upper and lower surfaces of the second intermediate member 3b are connected and supported by the intermediate portions of the upper surface plate 1 and the lower surface plate 2, and the upper and lower surfaces of the third intermediate member 3c. The other end portions of the upper surface plate 1 and the lower surface plate 2 are connected and supported. As a result, two locations where the fork pawls of the forklift can be inserted between the first intermediate member 3a and the second intermediate member 3b and between the second intermediate member 3b and the third intermediate member 3c. A gap is formed.
[0021]
By the way, a metal reinforced resin plate material described below is used for at least two of the six upper plates 1 and two of the six lower plates 1 at both ends.
[0022]
That is, the metal reinforced resin plate 10 has a uniform cross section in the longitudinal direction, and takes the form in which the periphery of the metal corrugated core 20 is covered with the resin 30 as shown in FIGS. . As the material of the core material 20, for example, iron or aluminum is employed, and as the resin 30, a thermoplastic resin that can be extruded, for example, PP or PE, or a foamed material of these thermoplastic resins is employed. .
[0023]
The thickness t of the metal plate constituting the core material 20 is, for example, about 0.3 to 1.0 mm, and the form of the corrugated plate is as shown in FIG. 3 when the surface of the plate material is a plane. The result that the form in which the upward convex rectangle and the downward convex rectangle are continuous is most preferable. However, in addition to this, the corrugated plate has a configuration in which an upward convex arc and a downward convex arc continue as shown in FIG. 6, or a triangular mountain as shown in FIG. It can take a continuous form. Further, as shown in FIG. 8, the core material 20 may be surrounded by the resin 30 so that the voids 35 are formed in the respective recessed groove portions of the core material 20. In this way, the resin is saved and the weight is reduced. The vertical height h of the corrugated core is preferably about 0.5 to 0.8 times the thickness T of the entire plate.
[0024]
In the embodiment shown in the figures, as shown in FIGS. 2 and 4, the covering material 30 a made of the same resin as the above resin is thermally welded or adhered to both end faces of the metal reinforced resin sheet 10. Connected by.
[0025]
According to the metal reinforced resin plate material 10 having such a configuration, the core material 20 is a corrugated metal plate having a thickness of at most 0.3 to 1.0 mm, although a metal is adopted as the core material. Since it is the resin 30 that coats, the weight reduction is achieved. In addition, since the metal core material 20 is present inside, the surface is hardly scratched, has excellent water resistance and corrosion resistance, and has a long life. Furthermore, since the core member 20 has a corrugated plate shape with a uniform cross section, the plate member 10 as a whole achieves sufficient bending rigidity in the longitudinal direction. In addition, since the core material 20 and the resin 30 can be separated relatively easily, these metals and resins can be recycled, leading to resource protection. Further, as in the embodiment shown in the figure, when the resin covering material 30a is connected to both ends, the core material 20 and the resin 30 are peeled off due to the penetration of moisture from the exposed surface, or the core material 20 is generated. Rust can be prevented and the life can be further extended.
[0026]
The metal reinforced resin sheet 10 as described above can be efficiently manufactured as follows.
[0027]
FIG. 5A shows a manufacturing process of the metal reinforced resin sheet 10 described above. The metal strip 20 a provided in a roll state is fed out of the roll by the drawing roller 40, conveyed forward at a constant speed, and supplied to the forming process 50. In the forming process, the depth of the corrugated sheet is gradually given by the plural stages of forming rollers 50a, 50b, and 50c, and the corrugated sheet having a desired cross-sectional shape is obtained through the final forming roller 50c.
[0028]
The strip-shaped metal corrugated sheet material thus continuously formed is then subjected to a resin extrusion molding process 60. In the resin extrusion molding step 60, the strip metal corrugated sheet material is formed by a resin extrusion molding machine 60a including a die having a core material introduction hole corresponding to the cross section of the corrugated sheet material and an exit hole corresponding to the cross sectional shape of the target sheet material. The resin molded product 10a enclosing the core material is continuously extruded by covering the periphery with a resin. At this time, since the core material 20 is already formed in a corrugated plate shape with a uniform cross section, the core material 20 has rigidity in the longitudinal direction. Therefore, the resin molded product 10a including the core material is stable, For example, the cross-sectional form shown in FIG. 3 can be obtained with high accuracy without shifting the position of the core material with respect to the outer shape in the cross-section.
[0029]
Next, the resin molded product 10 a is cooled by passing through the cooling bath 70. In this embodiment, the flatness of the side surface may be lost due to the thermal contraction of the resin at this time. In this embodiment, the side surface portion is cut out by the rotary cutter 81 to achieve the flatness of the side surface of the resin molded product 10a. ing. As described above, in order to ensure the flatness of the front and back surfaces of the plate material, it is preferable to use a rectangular corrugated plate as shown in FIG. After that, when the flatness of the front and back surfaces is lost, if necessary, only the front surface or the front and back surfaces may be subjected to plane cutting. Also in this case, it can process continuously according to the conveyance speed of the resin molding 10a.
[0030]
Next, the resin molded product 10 a is cut into predetermined lengths using the cutting cutter 82. The cutting cutter 82 moves in the width direction of the resin molded product 10a from the first position and moves in the same direction at the same speed as the transport speed of the resin molded product 10a while cutting the resin molded product 10a. When the cutting is completed, the movement of retreating in the width direction and moving back in the direction opposite to the conveyance direction and returning to the first position is repeated, and thus the continuity of formation of the resin molded product 10a is increased. The resin molded product 10a can be cut for each desired length without hindering. The cut unit plate material has a uniform cross section in the longitudinal direction, and the core material 20 inside thereof is also continuous without being interrupted.
[0031]
In this way, a basic metal reinforced resin sheet 10 is obtained. As described above, both the cut ends of the metal reinforced resin sheet 10 are coated with the same kind of resin as that used for extrusion molding as described above. The material 30a is connected by heat welding or adhesion.
[0032]
The upper surface plate 1 and the lower surface plate 2 made of the metal reinforced resin plate material obtained as described above can be connected to the intermediate member 3 using, for example, nails. In order to ensure effective connection strength by the nail, the intermediate member 3 can be made of wood. As described above, since the metal corrugated sheet included in the metal reinforced resin sheet 10 is thin, the nail can penetrate without any problem.
[0033]
The forklift pallet A configured in this way is handled by a forklift having a relatively high horsepower, but the bending strength of the metal-reinforced resin plate material 10 is remarkably improved, so that a heavy object is placed in the gap. A fork claw can be inserted, and thus it can sufficiently withstand the strong bending stress acting on the metal reinforced resin sheet 10 when the fork claw is lifted. Even if wood is used for the intermediate member 3, the surfaces of the upper surface plate 1 and the lower surface plate 2 forming the outer surface of the pallet A are resin surfaces, so that they can be easily crushed by rubbing against the floor surface or the like. The problem that the surface peels off hardly occurs. Moreover, the problem of damaging the luggage does not occur. And since the core material 20 of this metal reinforced resin sheet material 10 is a thin corrugated sheet shape, the weight of the whole pallet A does not increase. Moreover, since the metal reinforced resin sheet 10 has a uniform cross section in the longitudinal direction, it can be efficiently manufactured by the above-described process, and as a result, the pallet A for forklifts is provided at a low cost. can do.
[0034]
Of course, the scope of the present invention is not limited to the above-described embodiments, and all modifications within the scope of the matters described in each claim are included in the scope of the present invention.
[0035]
In the embodiment, among the plurality of upper surface plates 1 and the plurality of lower surface plates 2, the above-described metal reinforced resin plate material 10 is used, but of course, as all the upper surface plates 1 and the lower surface plates 2, A metal reinforced resin plate material 10 may be used. In this case, all of the upper surface plate 1 and the lower surface plate 2 can have exactly the same size and shape.
[Brief description of the drawings]
FIG. 1 is an overall perspective view of an embodiment of a forklift pallet according to the present invention.
FIG. 2 is an overall perspective view of a metal reinforced resin plate material used as an upper plate material and a lower plate material of the forklift pallet.
3 is a cross-sectional view taken along line III-III in FIG.
4 is a cross-sectional view taken along line IV-IV in FIG.
5A is an explanatory diagram of an example of a method for manufacturing the metal reinforced resin plate shown in FIG. 2; FIG.
(B) It is sectional drawing which follows the bb line of (a).
(C) It is sectional drawing which follows the cc line of (a).
(D) It is sectional drawing which follows the dd line | wire of (a).
(E) It is sectional drawing which follows the ee line | wire of (a).
FIG. 6 is a cross-sectional view of another embodiment of a metal reinforced resin plate material.
FIG. 7 is a cross-sectional view of still another embodiment of a metal reinforced resin plate material.
FIG. 8 is a cross-sectional view of still another embodiment of a metal reinforced resin plate material.
[Explanation of symbols]
A Forklift pallet 1 Upper surface plate 2 Lower surface plate 3 (3a, 3b, 3c) Intermediate member 10 Metal reinforced resin plate material 10a Resin molded product 20 Core material 20a Metal strip plate material 30 Resin 30a Cover material 40 Pulling roller 50 Forming process 50a, 50b , 50c Forming roller 60 Resin extrusion molding process 60a Resin extrusion molding machine 70 Cooling tank 81 Rotating cutter 82 Cutting cutter

Claims (3)

A plurality of long rectangular upper surface plates having a predetermined thickness are juxtaposed, and a plurality of long rectangular lower surface plates having a predetermined thickness are also juxtaposed, and the plurality of upper surface plates and the plurality of lower surface plates are separated by a predetermined gap. A forklift pallet having a plurality of intermediate members for connecting and supporting via,
All or a part of the plurality of upper surface plates and the plurality of lower surface plates includes a metal core material formed in a corrugated plate shape and a resin including the core material, and a portion including the core material is included. A forklift pallet using a metal reinforced resin plate having a uniform cross section in the longitudinal direction. The forklift pallet according to claim 1, wherein at least one of the plurality of upper surface plates located at both ends and the plurality of the lower surface plates located at both ends are the metal reinforced resin plate material. . The forklift pallet according to claim 1 or 2, wherein the metal reinforced resin plate material has a covering material bonded or welded to both ends thereof.

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