JP2020175903A - Foldable cardboard pallet - Google Patents

Abstract

To provide an inexpensive foldable cardboard pallet easy in member management and assembling at site, reduced in a transportation space and a storing space and in cost, with a simple structure.SOLUTION: A foldable cardboard pallet has a top plate 10 for placing a loading article thereon, a girder plate 50 foldable along a folding ruled line and forming a girder part S bearing the load of the loading article, and an intermediate plate 30 foldable along a folding ruled line, forming a bearing member of the girder part S and reinforcing strength of the cardboard pallet 1. In a folded state, the intermediate plate 30 is set between the top plate 10 and the girder plate 50, in such a way that the top plate 10, the intermediate plate 30 and the girder plate 50 form a flat board.SELECTED DRAWING: Figure 1

Description

The present invention relates to a cardboard pallet. Specifically, it relates to a foldable cardboard pallet that can be folded flat at the time of shipment and can be easily assembled by a user in the field.

In recent years, corrugated cardboard, which is a 100% recyclable environment-friendly material, has been attracting attention as a material for pallets that can be lifted by inserting the claws of forklifts and handlifts during cargo handling work, etc., in combination with the improvement of social environmental awareness. Various cardboard pallets have been proposed (see Patent Documents 1 and 2).

For example, Patent Document 1 proposed by the present inventor discloses a corrugated cardboard pallet whose strength is improved by using a top plate, a bottom plate, a triangular girder, a trapezoidal girder, a C-shaped opening fixing plate, and the like. ..

Similarly, Patent Document 2 proposed by the present inventor includes a top plate, a girder cover, and a truss girder housed in the girder cover, and the top plate and the girder cover are integrally formed into a sheet at the time of shipment. The truss girder is formed as a corrugated cardboard sheet with creases in which fold lines and cuts are alternately formed, and the truss girder is formed by bending the cardboard sheet at the time of use. Discloses a corrugated cardboard pallet formed in an inverted trapezoidal shape in which a plurality of triangles are connected and housed in a girder cover.

Japanese Unexamined Patent Publication No. 2014-231389 Japanese Unexamined Patent Publication No. 2018-47952

However, in the prior art described in Patent Document 1, when joining the girder and the top plate or the fixing plate, double-sided bonding (double-sided bonding) is required, which makes it difficult to ensure alignment and joining reliability. Therefore, it was necessary to join (adhere) them together with a dedicated joining device or the like in the factory of the pallet maker, assemble them integrally, and ship them. As a result, the volume of the entire pallet as a finished product becomes large (bulky), and there is a problem that the transport space and the storage space increase.

Further, although the prior art described in Patent Document 2 is intended to improve workability as compared with the cardboard pallet described in Patent Document 1, improvement in on-site assembly workability is still required. Was there. Specifically, since the truss girder is formed as a separate member for the integrally formed top plate and girder cover, when truss girders of different sizes and quantities are combined for a common top plate unit. In such cases, there have been problems such as material management and packing work becoming extremely complicated and storage space increasing. In addition, since the truss girders that are developed and formed in a sheet shape are inserted into tabs to form multiple right triangles to create the truss girders, it takes skill to assemble quickly and stably, and the truss girders are inside the girder cover. Since it is necessary to accurately accommodate and arrange the truss bridge, there have been problems such as reduced workability and the need for special jigs. Further, when the truss girder is misaligned in the girder cover, there is a problem that the support of the load becomes unstable.

Therefore, the present invention has been made in view of the above-mentioned problems of the prior art, and it is easy to manage members and assemble on-site, and it is possible to reduce the transportation space and the accommodation space and reduce the cost. The purpose is to provide a cardboard pallet with a simple structure at low cost.

In order to achieve the above object, the foldable cardboard pallet according to the present invention is a foldable corrugated cardboard pallet that can be folded along a folding ruled line and a top plate on which a load is placed. The girder plate forming the girder portion that supports the load of the load and the girder plate that can be bent along the bending rule line to form the support member of the girder portion and to reinforce the strength of the cardboard pallet. The middle plate is between the top plate and the girder plate so that the top plate, the middle plate, and the girder plate form an integral flat board in a folded state. It is characterized by being intervened.

Here, the integrally flat board shape means a state in which each member of the top plate, the middle plate, and the girder plate is integrally laminated and formed, and at least a part of each member is joined (adhesively fixed) to each other. And.

With such a configuration, it is easy to manage members and assemble on-site, and it is possible to perform integral processing, and at the same time, it is possible to reduce the transport space and the accommodation space and reduce the cost.

Further, in the assembled state, the girder portion is formed in an inverted trapezoidal shape, and the end portion of the girder plate and the corresponding end portion of the middle plate are arranged to face each other as open ends. The shape may be held by elastic restoring force.

With such a configuration, it is possible to avoid contact with the claws of the forklift and easily maintain the shape of the girder portion with high workability.

Further, the middle plate includes a pair of middle plate ends having a part thereof joined to both ends of the top plate, and a middle plate connecting portion which is connected to each of the middle plate ends in a flat plate shape in a folded state. In the assembled state, the girder plate forms a pair of inverted trapezoidal girder portions whose outer end portions are open, and each of the middle plate end portions has the girder portion. The facing support portion arranged to face the outer end portion may be formed by bending.

With such a configuration, the elastic restoring force of the middle plate and the girder plate can be effectively used to maintain the shape of the girder portion.

Further, the middle plate has a middle plate connecting portion in which a part thereof is joined to the central portion of the top plate and a middle plate end portion which is folded back at the end portion of the top plate and also serves as the girder plate. In the assembled state, the middle plate end portion forms a pair of inverted trapezoidal girder portions whose inner end portions are open, and both ends of the middle plate connecting portion have the above. The facing support portion arranged to face the inner end portion of the girder portion may be formed by bending.

When configured, the length of the girder portion in the width direction can be further expanded, and the strength and workability can be further improved.

Further, the middle plate has a pair of middle plate end portions whose at least a part thereof is joined to both ends of the top plate, and a middle plate connecting portion which is connected to each of the middle plate end portions in a flat plate shape in a folded state. In the assembled state, the girder plate has a pair of girder plates forming a pair of inverted trapezoidal girder portions whose outer end portions are open, and the inside of the girder plate at one end of the top plate. It has an end girder plate that forms an inverted trapezoidal end girder portion with open ends, and the paired girder plate and the end girder plate are formed by bending at both ends of the middle plate connecting portion to form the girder. It may be connected to the open end of the portion and the end girder portion via an opposed support portion arranged to face the portion.

With such a configuration, the number of girders can be arbitrarily set for a large pallet or the like.

In the above, a reinforcing member that follows the shape of the inner surface of the girder may be inserted into the girder.

With such a configuration, for example, a heavy object of 500 kg or more can be loaded.

According to the folding cardboard pallet according to the present invention, it is possible to easily manage members and assemble on-site, and it is possible to reduce the transport space and the storage space and reduce the cost.

It is a schematic view which shows the structure of the corrugated cardboard pallet which concerns on Embodiment 1 of this invention, (a) is the front view which shows the folded state, (b) is the front view which shows the assembled state, (c) is reinforcement. It is a figure which shows the state which the member was inserted. It is a schematic diagram which shows the structure of the corrugated cardboard pallet which concerns on Embodiment 2 of this invention, (a) is the front view which shows the folded state, and (b) is the front view which shows the assembled state. It is a schematic diagram which shows the structure of the corrugated cardboard pallet which concerns on Embodiment 3 of this invention, (a) is the front view which shows the folded state, and (b) is the front view which shows the assembled state.

<Embodiment 1>
An embodiment of the folding cardboard pallet according to the present invention will be described below with reference to the drawings. Here, FIG. 1 is a schematic view showing a basic configuration of a folding cardboard pallet according to the first embodiment.

As shown in FIG. 1, the folding cardboard pallet 1 according to the present embodiment includes a top plate 10 on which a load is placed and a girder plate 50 constituting a girder portion that supports the load of the load. A middle plate 30 is provided between the top plate 10 and the girder plate 50 to form a part of the girder portion (support member) and to reinforce the strength of the top plate 10. Then, in the state at the time of shipment (hereinafter, also referred to as a folded state), the girder plate 50, the middle plate 30, and the top plate 10 are laminated in this order to form a single board (see FIG. 1A). ).

In the present invention, the top plate, the middle plate, and the girder plate are all formed by laminating two to three reinforced cardboard sheets previously cut to a predetermined size and laminating and joining them. The reinforced corrugated cardboard sheet is a so-called double-sided corrugated cardboard (AB stage: 8 mm) in which a single-sided corrugated cardboard is attached to one side of the double-sided corrugated cardboard. The liner is K6 or K7, and the core is MM180. Has been done. The girder plate may be combined with a so-called Tri-Wall (registered trademark) cardboard (AAA thickness 15 mm, AAA thickness 10 mm) or the like. Further, when used in a place where water is used, the top plate, the middle plate, and the girder plate may all be formed of plastic cardboard.

As shown in FIG. 1 (b), the middle plate 30 according to the present embodiment includes a pair of middle plate end portions 33 arranged at both ends in the width direction (left-right direction in FIG. 1) of the top plate 10. It has a middle plate connecting portion 31 that is joined (adhesively fixed) to the top plate 10 and is connected to the middle plate end portion 33 in a folded state in a flat plate shape (so as not to cause a step). The middle plate end portions 33 at both ends are preliminarily provided with fold ruled lines, and the pair of joint end portions 33s joined to the top plate 10 and the girder plate folded back toward the girder plate 50 along the fold ruled lines. It is composed of a pair of opposed support portions 33e which are arranged to face the end portion of 50 and are supported by an elastic restoring force.

On the other hand, the girder plate 50 is a continuous corrugated cardboard sheet with a bent ruled line, and has a girder plate joint portion 51 joined to the middle plate connecting portion 31 at the center of the middle plate connecting portion 31, and this girder. A pair of girders S are formed which are symmetrical with respect to the plate joint 51 and are bent into an inverted trapezoid (the upper bottom is longer than the lower bottom). More specifically, a pair of inclined portions 53t that are bent diagonally downward along the bending ruled line continuously from both ends of the girder plate joint portion 51, and continuous from the inclined portion 53t and parallel to the top plate 10. A pair of lower bottom portions 53 forming an inverted trapezoidal lower bottom, and the lower bottom portion 53 is continuously bent diagonally upward, and its end portion (outer end portion of the girder portion S) is opened. It has a pair of open end portions 53e and forms an inverted trapezoidal girder portion S.

Then, in the present embodiment, the claws of the forklift are inserted into the pair of inverted trapezoidal girders S for transportation. In this way, by forming the forklift holes in an inverted trapezoidal shape (the upper bottom is longer than the lower base), compared to the trapezoidal (the upper bottom is shorter than the lower base) fork holes. It is possible to easily avoid contact between the claws of the forklift and the girder portion S to improve workability and prevent damage to the folding cardboard pallet 1.

Further, in the folded state, the members (top plate 10, middle plate 30, girder plate 50) constituting the folded cardboard pallet 1 are laminated and formed in an integral board shape, so that, for example, the girder plate is configured as a separate member. Compared with the mode, the member management becomes extremely simple, the storage space of the cardboard pallet 1 itself can be reduced, and the packing workability and loading efficiency at the time of transportation can be significantly improved. In addition, since the top plate 10, the middle plate 30, and the girder plate 50 are in a state where flat sheets are stacked, these laminated sheets can be integrally processed and molded into a board shape in a single pressing process. It can be easily mechanized and contribute to a significant improvement in productivity and cost reduction.

Further, in general, in the case of a square girder such as a trapezoid or a rectangle, it is difficult to maintain the shape due to the elastic restoring force of the reinforced corrugated cardboard sheet even if the sheet is bent to form a predetermined shape. However, in the folding cardboard pallet 1 according to the present embodiment, the folded cardboard pallet 1 is reinforced by fitting the open end 53e of the girder plate 50 inside the opposed support 33e of the middle plate with the end of the inverted trapezoidal girder as the open end. The elastic restoring force of the corrugated cardboard sheet can be applied in the direction of pressing against each other to stably maintain the shape of the girder portion S. That is, at the time of assembly, a pair of girder portions S are formed by bending along a folding ruled line previously attached to the girder plate 50, and each of the pair of open end portions 53e is formed by a pair of opposed supporting portions 33e. It is possible to easily form a corrugated cardboard pallet that can stably maintain the inverted trapezoidal girder shape simply by fitting it so as to face the above.

The folding cardboard pallet according to the present invention is suitable for a relatively lightweight load having a load of less than 500 kg, but when transporting a heavy load having a load of 500 kg or more, FIG. 1 (c). As shown in the above, a reinforcing member RS made of reinforced cardboard having a shape (for example, a dish shape) that resembles the inner surface of the girder portion S may be inserted (or fitted).

<Embodiment 2>
Next, another embodiment of the cardboard pallet according to the present invention will be described with reference to the drawings. Here, FIG. 2 is a schematic view showing the basic configuration of the cardboard pallet according to the second embodiment. Members having the same functions as those in the previous embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 2, in the corrugated cardboard pallet 1A according to the present embodiment, the top plate 10, the middle plate 30A, and the girder plate 50A are integrally laminated in a board shape in a folded state as in the previous embodiment. (See FIG. 2 (a)).

As shown in FIG. 2B, the middle plate 30A according to the present embodiment includes a pair of middle plate end portions 33A arranged at both ends in the width direction (left-right direction in FIG. 2) of the top plate 10. It has a middle plate connecting portion 31A that is adhered to the top plate 10 and is connected to the middle plate end portion 33A in a folded state in a flat plate shape (so as not to cause a step). Specifically, the pair of middle plate end portions 33A are preliminarily provided with fold ruled lines so that they can be folded back at both ends (outermost in the width direction), and the middle plate 30A according to the present embodiment is provided. Is also used (continuously formed) as the girder plate 50A. More specifically, the middle plate end portions 33A at both ends are bent diagonally downward along the bending ruled line in succession from the pair of joining end portions 33As joined to the top plate 10 and the joining end portions 33As. A pair of inclined portions 53At, a pair of lower bottom portions 53A that are continuously bent in parallel with the top plate 10 to form an inverted trapezoidal lower base, and a continuous diagonally upward direction from the lower bottom portion 53A. It has a pair of open end portions 53Ae whose ends (inner end portion of the girder portion SA) are open, and is symmetrical in an inverted trapezoidal shape (the upper bottom is longer than the lower base). A pair of girder portions SA are formed.

On the other hand, the middle plate connecting portion 31A is a corrugated cardboard sheet having bent ruled lines at both ends thereof, and is a middle plate joint portion 31As joined (adhesively fixed) to the top plate 10 at the center of the top plate 10. It is bent diagonally downward from both ends of the middle plate joint portion 31As, is arranged to face the pair of open end portions 53Ae, and has a pair of opposed support portions 31Ae that hold the shape of the pair of girder portions SA by elastic restoring force. doing.

Then, at the time of assembly, the pair of middle plate end portions 33A are bent to form a pair of inverted trapezoidal girder portions SA, and each of the open end portions 53Ae is folded back from the middle plate connecting portion 31A. By fitting it on the outside of the facing support portion 31Ae, the inverted trapezoidal shape of the girder portion SA is maintained by utilizing the elastic restoring force as in the previous embodiment, and damage caused by the claws of the forklift is prevented. At the same time, it enables integrated processing by press molding. Further, as compared with the first embodiment, the length of the girder portion SA in the width direction can be expanded, so that the strength can be further improved and the support can be stabilized.

<Embodiment 3>
Next, another embodiment of the folding cardboard pallet according to the present invention will be described with reference to the drawings. Here, FIG. 3 is a schematic view showing the basic configuration of the cardboard pallet according to the third embodiment. Members having the same functions as those in the previous embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In the corrugated cardboard pallets 1B according to the present embodiment, the corrugated cardboard pallets according to the previous embodiment all have the middle plate and the girder plate symmetrically arranged from the center in the width direction of the top plate 10, and an even number (for example, two). The girder portions S and SA are formed, whereas the middle plate and the girder plate are arranged asymmetrically to form an odd number (for example, three) girder portions SB and SBe.

As shown in FIG. 3, in the corrugated cardboard pallet 1B according to the present embodiment, the top plate 10, the middle plate 30B, and the girder plate 50B are integrally laminated in a board shape in the folded state as in the previous embodiment. (See FIG. 3 (a)).

As shown in FIG. 3B, the middle plates 30B according to the present embodiment include middle plate end portions 33B and 34B arranged at both ends in the width direction (left-right direction in FIG. 3) of the top plate 10. It has middle plate connecting portions 31B and 32B which are joined (adhesively fixed) to the top plate 10 and connected to the middle plate end portions 33B and 34B in a flat state (so as not to cause a step) in a folded state. The middle plate end portion 33B at one end is provided with a fold ruled line in advance, and the joint end portion 33Bs joined (adhesively fixed) to the top plate 10 and the girder are folded back toward the girder plate 50B along the fold ruled line. It is composed of an opposed support portion 33Be facing the end portion of the plate 50B. The middle plate end portion 34B at the other end is entirely joined to the end portion of the top plate 10. Further, while the middle plate connecting portion 31B is entirely joined to the top plate 10, the middle plate connecting portion 32B is bent diagonally downward from both ends of the middle plate joining portion 32Bs and the middle plate joining portion 32Bs. It has a pair of opposed support portions 32Be.

The girder plate 50B is a corrugated cardboard sheet having a bent ruled line, and is an end girder plate that further forms an end girder portion SB via a pair of girder plates 53B forming a pair of girder portions SB and a middle plate connecting portion 32B. It has 54B and. More specifically, the counter-girder plate 53B has a girder plate joint 51B joined to the middle plate joint 31B at the center of the middle plate joint 31B, and is continuous from the girder joint 51B. A pair of inclined portions 53Bt that are bent diagonally downward along the folding ruled line, and a pair of lower parts that are bent so as to be parallel to the top plate 10 continuously from the inclined portion 53Bt and form an inverted trapezoidal lower bottom. A bottom portion 53B and a pair of open end portions 53Be which are continuously bent diagonally upward from the lower bottom portion 53B and whose ends are open are formed in an inverted trapezoidal shape (the upper bottom is longer than the lower bottom). ), A pair of girder portions SB are formed symmetrically when viewed from the middle plate connecting portion 31B. On the other hand, the end girder plate 54B includes a joint end portion 54Bs joined to the middle plate end portion 34B, an inclined portion 54Bt that is continuously bent from the joint end portion 54Bs and obliquely downward along a bending ruled line, and the like. A lower bottom portion 54B that is continuously bent from the inclined portion 54Bt so as to be parallel to the top plate 10 to form an inverted trapezoidal lower bottom, and a lower bottom portion 54B that is continuously bent diagonally upward from the lower bottom portion 54B and its end portion. The open end portion 54Be is formed, and the end girder portion SBe having an inverted trapezoidal shape (a trapezoidal shape in which the upper bottom is longer than the lower bottom) is formed.

That is, an odd number of girder portions SB are additionally connected to the end portions of the girder plate 53B forming the symmetrical girder portion SB via the middle plate connecting portion 32B whose both sides are open ends. (3 in this example) girders are formed.

In this way, a large pallet is created by connecting the end girders to the symmetrical (even number) girders as in the first and second embodiments via the connecting portions having open ends on both sides. Even in such a case, a palette with an arbitrary number of digits (even number, odd number) can be realized.

As described above, according to the folding cardboard pallet according to the present invention, the constituent members such as the top plate 10, the middle plate 30, 30A, 30B, and the girder plates 50, 50A, 50B are integrally formed as a laminated board at the time of shipment from the factory. As a result, mechanization (press molding) can be easily performed, and transportation costs and storage costs can be significantly reduced. Further, since the girder portion S, SA, SB, SBe is formed along a predetermined bending ruled line and each end portion is fitted into the opposite end portion, the assembly can be easily performed, which greatly improves workability. Can be planned.

The technical scope of the present invention is not limited to the above-described embodiments, and various changes or improvements can be made without departing from the gist of the present invention. For example, the girder portion may have a rectangular girder shape such as a trapezoidal shape or a rectangular shape as well as an inverted trapezoidal shape. In addition, each of the above-described embodiments may be combined as appropriate.

1,1A, 1B Folding cardboard pallet 10 Top plate 30, 30A, 30B Middle plate 31, 31A, 31B, 32B Middle plate joint 31Ae, 32Be, 33e, 33Be Opposing support 31As, 32Bs Middle plate joint 33, 33A, 33B, 34B Middle plate end 33s, 33As, 33Bs Joint end 50, 50A, 50B Girder plate 51, 51B Girder joint 53, 53A, 53B Lower bottom 53t, 53At, 53Bt Inclined portion 53e, 53Ae, 53Be Open end Part 53B Girder plate 54B End girder plate RS Reinforcing member S, SA, SB, Girder part SBe End girder part

Claims (6)

In a foldable cardboard pallet
The top plate on which the load is placed and
Bending A girder plate that can be bent along a ruled line and forms a girder portion that supports the load of the load.
A middle plate that can be bent along a folding ruled line to form a support member for the girder and to reinforce the strength of the cardboard pallet.
With
In the folded state, the middle plate is interposed between the top plate and the girder plate so that the top plate, the middle plate, and the girder plate form an integral flat board. Folding cardboard pallet featuring. In the assembled state, the girder portion is formed in an inverted trapezoidal shape, and the end portion of the girder plate and the corresponding end portion of the middle plate are arranged to face each other as open ends, and the shape of the girder portion is The folding cardboard pallet according to claim 1, wherein the cardboard is held by an elastic restoring force. The middle plate has a pair of middle plate end portions whose parts are joined to both ends of the top plate, and a middle plate connecting portion which is connected to each of the middle plate end portions in a flat plate shape in a folded state. And
In the assembled state, the girder plate forms a pair of inverted trapezoidal girder portions whose outer end portions are open, and each of the middle plate end portions has an outer end portion of the girder portion. The folding cardboard pallet according to claim 1 or 2, wherein the facing supporting portions arranged to face each other are formed by bending. The middle plate has a middle plate connecting portion in which a part thereof is joined to the central portion of the top plate and a middle plate end portion that is folded back at the end portion of the top plate and also serves as the girder plate. Have and
In the assembled state, the middle plate end portion forms a pair of inverted trapezoidal girder portions whose inner end portion is open, and the inner ends of the girder portion are formed at both ends of the middle plate connecting portion. The folding cardboard pallet according to claim 1 or 2, wherein the facing support portion arranged to face the portion is formed by bending. The middle plate has a pair of middle plate end portions whose at least a part thereof is joined to both ends of the top plate, and a middle plate connecting portion which is connected to each of the middle plate end portions in a flat plate shape in a folded state. Have and
In the assembled state, the girder plate has a pair of girder plates forming a pair of inverted trapezoidal girder portions whose outer end portions are open, and an inner end portion thereof is opened at one end of the top plate. It has an end girder plate that forms an inverted trapezoidal end girder.
The paired girder plate and the end girder plate are bent and formed at both ends of the middle plate connecting portion, and are connected to the girder portion and the open end of the end girder portion via facing support portions arranged to face each other. The folding cardboard pallet according to claim 1 or 2. The folding cardboard pallet according to any one of claims 1 to 5, wherein a reinforcing member that conforms to the shape of the inner surface thereof is inserted into the girder portion.

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