JP2002362556A - Synthetic resin pallet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the strength of the whole body of a pallet by heightening the rigidity especially around fork insertion ports of the pallet. SOLUTION: The synthetic resin pallet comprises a square-shaped upper board portion 1, a lower board portion 2 and girder portions 3, 4, 5 connecting the upper board portion 1 and the lower board portion 2 together, Fork insertion ports 6 are formed between the girder portions 3 and 4 at the side of the pallet. A rectangular reinforcing frame 70 surrounding a section crossing the fork inserting direction of the fork insertion port 6 is formed in a plurality of numbers at each of the fork insertion ports 6, and hollow parts 70' are formed, stretching at least three sides of the reinforcing frame 70 at each of the reinforcing frames 70.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin pallet used for transporting and storing various articles.

[0002]

2. Description of the Related Art Conventionally, wood pallets have been used for transporting and storing articles.
Pallets made of synthetic resin are also becoming popular because they are lighter than wood, are less likely to deteriorate, and do not have fluff peculiar to wood.
In particular, integrated molding pallets in which the upper and lower surfaces are integrally formed by injection molding are used in a wide variety of fields instead of wood pallets because of their high production efficiency.

As shown in FIG. 23, for example, this kind of synthetic resin pallet connects a rectangular upper plate portion 200 and a lower plate portion 202 with the upper plate portion 200 and the lower plate portion 202. A plurality of spar portions 204 are provided, and a pair of fork insertion ports 206 are formed between the spar portions 204 in parallel with each other. In the example of FIG. 23, the fork insertion port 206 is formed only on two side surfaces, but there is a case where a pair of fork insertion holes is formed on all four side surfaces.

[0004] The upper plate-shaped portion 200 is called a deck board, and as shown in FIG.
8, and the lower plate-shaped portion 202 also has a number of crosspieces 212 extending horizontally. A bar portion 208 forming the upper plate portion 200 and a bar portion 212 forming the lower plate portion 202
Are alternately displaced from each other, so that many holes are opened between them. The piers 208 and 212
In general, the cross section is formed in a U-shape or T-shape, and is devised so as to increase the strength of the upper plate-shaped portion 200 and the lower plate-shaped portion 202.

The girder portion 204 is formed by combining a number of vertical walls 210 vertically and horizontally.
12 are connected. In order to prevent the vertical wall 210 from being bent, reinforcing ribs 214 are formed in some places along the vertical wall 210 to connect the beam portions 208 and 212 together.

FIG. 25 shows a method described in Japanese Patent Publication No. Sho 49-582 as an example of a method of forming such an integrated molding pallet. As shown in this figure, since the crosspieces 208 and 212 are shifted from each other in the horizontal direction, molding can be performed relatively simply between the upper mold 216 and the lower mold 218 without using many complicated slide cores. Further, a laborious joining process is not required as compared with a case where the upper and lower portions are divided and molded, and the two are joined to form a pallet. For this reason, the production efficiency of the integrally molded pallet is high.

[0007]

However, when a load is applied to the pallet while supporting both ends of the pallet, particularly large bending stress is applied to the four corners of the fork insertion opening 206 in the synthetic resin pallet. There is a problem that the fork insertion opening 206 is easily deformed into a parallelogram, and the whole pallet is more easily bent than a wooden pallet.

The present invention has been made in view of the above circumstances, and provides a synthetic resin pallet that can increase the strength of the entire pallet and increase the production efficiency, particularly by increasing the rigidity around the fork insertion opening. It is intended to be.

[0009]

In order to solve the above problems, a synthetic resin pallet according to the present invention comprises an upper plate portion and a lower plate portion arranged in parallel with each other, and the upper plate portion and the lower plate. A pallet made of a synthetic resin having a plurality of girder portions connecting the fork-shaped portions, and a fork insertion opening formed between the girder portions, wherein the fork insertion of the fork insertion opening corresponds to the fork insertion opening. A reinforcing frame surrounding a cross section orthogonal to the direction is formed, and a hollow portion is formed inside at least a part of the reinforcing frame.

According to the present invention, at least a part of the fork insertion port is surrounded by the reinforcing frame having a hollow structure, so that it is possible to prevent the cross-sectional shape of the fork insertion port from being distorted when a load is applied. Thereby, the rigidity of the synthetic resin pallet can be increased.

The reinforcing frame includes an upper horizontal bar formed along the upper plate portion, a lower horizontal bar formed along the lower plate portion, and connecting the upper horizontal bar and the lower horizontal bar. And a pair of vertical bars, and at least three of the upper horizontal bar, the lower horizontal bar, and the pair of vertical bars may have a hollow portion communicating with each other.

[0012] Of the upper horizontal bar, the lower horizontal bar, and the pair of vertical bars, a portion having no hollow portion inside has a thickness smaller than a portion having a hollow portion inside. It may be made smaller. Specifically, the width of the portion having no hollow portion inside is preferably 10 to 50% of the width of the portion having the hollow portion inside. The upper horizontal bar, the lower horizontal bar, and the pair of vertical bars may all have a hollow portion communicating with each other.

A gas inlet communicating with the hollow portion is formed on an outer surface of the reinforcing frame, and a non-slip member for closing the gas inlet is attached to the upper plate portion or the lower plate portion. It may be. In this case, infiltration of rainwater from the gas inlet can be prevented.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a synthetic resin pallet according to the present invention will be described below with reference to the drawings. However, the present invention is not limited to the following embodiments. For example, the components of these embodiments may be appropriately combined.

First Embodiment FIGS. 1 to 6 show a first embodiment of a synthetic resin pallet of the present invention. FIG. 1 is a plan view, FIG. 2 is a bottom view, FIG. Is a side view, FIG.
1 is a sectional view taken along line AA in FIG. 1, and FIG. 6 is a sectional view taken along line BB.

The synthetic resin pallet of this embodiment has a box-like shape as a whole, and has a square upper plate-like portion 1 and a lower plate-like portion 2 arranged in parallel with each other, and an upper plate-like portion 1 and a lower plate. It has beam portions 3, 4, and 5 connecting the shape portions 2. The girder part 3 is formed at the four corners of the upper plate part 1 and the lower plate part 2, the girder part 4 is formed at the center of the four sides of the pallet, and the girder part 5 is formed at the center of the pallet. Each of the girder portions is constituted by a number of vertical walls.

On the four sides of the pallet, a pair of rectangular fork insertion openings 6 are formed between the girder portions 3 and 4, respectively. Penetrates through. As a result, two forks can be inserted into the pallet of this embodiment from any of the four sides. However, the synthetic resin pallet of the present invention is not limited to this configuration, and the fork insertion port 6 may be formed only on two opposing sides (see FIG. 18). The number may be changed as appropriate.

A feature of the present invention is that, as shown in FIG. 6, a plurality of rectangular reinforcing frames 70 are formed for each of the four fork insertion ports 6 so as to surround a cross section orthogonal to the fork insertion direction of the fork insertion port 6. A hollow portion 70 ′ is formed inside the reinforcing frame 70 over the entire circumference of the reinforcing frame 70.

In this embodiment, two reinforcing frames 70 are formed near the openings at both ends of each fork insertion opening 6, that is, between the girder 3 at the four corners and the girder 4 at the center of the side. I have. In the case where the reinforcing frames 70 are formed near both ends of the fork insertion opening 6 as described above, when the fork is inserted into the fork insertion opening 6, the load from the tip portion and the root portion of the fork, on which a force is particularly applied, is reduced. Since the support frame 70 can support the reinforcing frame 70, it is preferable to a configuration in which the reinforcing frame 70 is formed only at the center of the fork insertion opening 6. However, the present invention is not limited to this configuration. The formation position of the reinforcing frame 70 may be arbitrarily changed as needed. Although the number of the reinforcing frames 70 per one fork insertion port 6 is not particularly limited, for example, 1 to 6 pieces may be provided according to the entire length of the fork insertion port 6.

The reinforcing frame 70 of this embodiment includes an upper horizontal bar 71 formed on the upper plate 1, a lower horizontal bar 72 formed on the lower plate 2, and the girder 3 at the four corners. It is formed by a vertical bar 73 extending vertically and a vertical bar 74 extending vertically along the spar 4 at the center of the side. The hollow portions 70 'formed inside the upper horizontal bar 71, the lower horizontal bar 72, and the vertical bars 73 and 74 are in communication with each other.

Immediately after the synthetic resin pallet is injection-molded, the hollow portion 70 'is formed by, for example, blowing high-pressure gas from the center of the upper horizontal bar 71 to solidify the resin inside the bars 71 to 74. A cavity corresponding to the volume reduction caused by the above is formed. This can prevent surface roughness due to sink marks and lowering of molding accuracy, and also makes the cross-section central portion hard to be solidified hollow, so that the crosspieces 71 to 74 can be formed.
The effect of shortening the solidification time is also obtained.

Since the bars 71 to 74 are formed in the shape of a rectangular tube having a hollow portion 70 ′ therein, the production efficiency is reduced as compared with the conventional U-shaped or T-shaped cross-section. Without increasing the weight of the pallet, the strength around the fork insertion opening 6 can be greatly increased. Therefore, even when a large load is applied to the pallet, the fork insertion opening 6 is unlikely to be deformed into a parallelogram, and it is possible to suppress the pallet from bending.

The upper horizontal rail 71 and the lower horizontal rail 72 of this embodiment have a rectangular cross section and are not limited in size, but generally have a width in the horizontal direction of 15 to 50 mm and a thickness in the vertical direction. It is preferably 15 to 40 mm.

The vertical bar 73 and the vertical bar 74 are also rectangular in cross section, and the width in the fork insertion direction is equal to the width of the upper horizontal bar 71 and the lower horizontal bar 72, and the thickness in the direction orthogonal to the fork insertion direction is reduced. It is preferable to set it to 10 to 30 mm.

As shown in FIG. 1, a bar 11 extending parallel to the upper horizontal bar 71 is formed between the girder 3 at the four corners and the girder 4 at the center of the side of the upper plate 1. A bar 12 extending in the fork insertion direction is formed.
1 and the crosspiece 11 and the crosspiece 12 intersect in a grid pattern.
A number of openings are formed between each grid.

As shown in FIG. 5, the lower plate 2 has a fork and a pallet truck along the upper end of the lower horizontal bar 72 between the girder 3 at the four corners and the girder 4 at the center of the side. The horizontal plate-shaped part 21 is formed so that insertion can be performed smoothly. Further, on both side edges of the horizontal plate-like portion 21, a downwardly inclined surface 22 and a downwardly inclined side 24 ′ by a rib 24 provided on the lower plate-like portion 23 are formed. Such a horizontal plate portion 2 is attached to the lower plate portion 2.
1. By forming the inclined surface 22, the inclined side 24 ',
Operability when the fork of the pallet truck is put in and out of the fork insertion opening 6 can be improved.

As shown in FIG. 5, a bar 25 extending in parallel with the lower horizontal bar 72 and a bar 26 extending in the fork insertion direction are formed on the rear surface of the horizontal plate-like portion 21 as shown in FIG. The horizontal bar 72 and the bar 25 and the bar 26 intersect in a grid pattern.

As shown in FIG. 6, inside the girder portions 3 at the four corners, a bar 31 is formed on the upper plate portion 1 and is continuous with the upper horizontal bar 71, and the bar 31 is formed on the lower plate portion 2. A bar 32 extending in the same direction as the bar 31 is formed at a position where the bar 32 does not overlap vertically.

Inside the girder 4 at the center of the side, the upper plate 1 is formed with a bar 41 continuous with the upper horizontal bar 71 as shown in FIG. As shown in FIG. 2, the lower plate-like portion 2 is located at a position where the lower
A bar 42 extending in the same direction as the bar 41 is formed.

Inside the girder portion 5 at the center of the pallet, a bar 51a is formed between the girder walls facing the upper plate-like portion 1 and a position where the lower plate-like portion 2 does not vertically overlap with the bar 51a. A bar 52a extending in the same direction as the bar 51a is formed. In addition, a crosspiece 51b is formed between the girder wall and the partition wall 53, and a crosspiece 52b is formed on the lower plate-shaped portion 2 at a position not vertically overlapping with the crosspiece 51b and extending in the same direction as the crosspiece 51b. I have. Between the girder part 4 at the center of the side and the girder part 5 at the center of the pallet, a crosspiece 17 for connecting the girder part 4 at the center of the side and the girder part 5 at the center of the pallet is formed on the upper plate-like part 1. In addition, a bar 27 is formed on the lower plate-shaped portion 2 and connects the beam 4 at the center of the side and the beam 5 at the center of the pallet at a position that does not vertically overlap the beam 17.

A rib 28 is provided on each of the right and left ends of the crosspiece 27 connecting the girder part 4 at the center of the side and the girder part 5 at the center of the pallet, and the rib 28 forms an inclined side 28 '. Insert the fork into the fork slot 6
The operability at the time of putting in and taking out of the device can be improved.

In the upper plate-like portion, the crosspiece 17 connecting the center side spar 4 and the pallet center spar 5 is continuous with the crosspiece 51a or 51b formed in the center pallet 5 of the pallet. . In the lower plate 2, the crosspiece 27 connecting the center side spar 4 and the pallet center spar 5 is formed by a crosspiece 52 a or 52 b formed in the pallet center spar 5.
And is continuous.

At a portion where the fork insertion opening 6 intersects, a rectangular peripheral portion 18 surrounding the periphery of the intersecting portion is formed in the upper plate-like portion 1, and inside the rectangular peripheral portion 18, Lattice-shaped bar 19 consisting of many bars crossed vertically and horizontally
Are formed. The lower plate-shaped portion 2 is formed with a rectangular opening having substantially the same size as the lattice-shaped bar 19 at a position facing the lattice-shaped bar 19.

On the upper plate-like portion 1 of the synthetic resin pallet, a non-slip tape 81 made of synthetic resin is attached on the upper horizontal bar 71. By providing such a non-slip tape 81, when placing an article on a synthetic resin pallet and transporting the article, the article can be made hard to slip on the synthetic resin pallet. Upper horizontal beam 71, beam 31 and beam 4
1 and a non-slip tape 81 may be provided on each of them.

FIG. 8 shows an example of the mounting structure of the non-slip tape 81. A shallow concave portion 81a having a width slightly larger than the width of the non-slip tape 81 is formed on the upper horizontal rail 71, and the non-slip tape 81 is bonded in the concave portion 81a. As the bonding method, a method in which the bonding surfaces are heated and melted and pressed against each other is preferable.

The depth of the concave portion 81a is smaller than the thickness (for example, about 2 mm) of the non-slip tape 81 (for example, about 1 mm), and the slip of the non-slip tape 81 is prevented while preventing the slip of the non-slip tape 81. The effect is obtained. Further, the non-slip tape 81 also has an effect of closing the gas blowing hole 70a of the hollow portion 70 '. If the gas blowing hole 70a remains open, rainwater or the like may enter the hollow portion 70 '.

Similarly to the non-slip tape 81, a non-slip tape 82 is attached to the lower surface of the lower horizontal bar 72 on the lower surface of the lower plate-like portion 2 of the synthetic resin pallet. Thus, when articles are placed on the synthetic resin pallet and stacked, the upper synthetic resin pallet placed on the lower article can be prevented from slipping on the lower article.

Examples of the material of the non-slip tapes 81 and 82 include an ethylene-vinyl acetate copolymer and a polyolefin elastomer.

The synthetic resin pallet of the present invention can be formed of a synthetic resin such as polyethylene or polypropylene, and additives such as a coloring agent and a filler may be appropriately added to the synthetic resin. The reinforcing frame which is a feature of the present invention is also formed of the same material as the synthetic resin pallet body. Of course, a synthetic resin having higher strength than polyethylene or polypropylene may be used as the pallet material.

The synthetic resin pallet of the present invention can be formed by an injection molding method in which a molten synthetic resin is injected into a mold. When the molten synthetic resin is injected into the mold, the gas is injected into the molten synthetic resin injected into the mold, so that the upper and lower horizontal bars 71 and 72 and the vertical bars 73 and 74 are formed. A hollow portion 70 'can be formed. Thereby, despite the large thickness, the molding distortion due to sink is small, and the upper and lower horizontal bars 71, 72 and vertical bars 73, 74 whose surfaces are smooth are smooth.
Can be molded.

The hollow portion 7 extends over the entire circumference of the reinforcing frame 70.
In order to form 0 ', as shown in FIG. 7, a resin reservoir 72a is formed inside the injection mold opposite to the gas blowing hole 70a, and the resin flows out into the resin reservoir 72a as a waste tab 72b. You may do so. This makes it easy to form the hollow portion 70 ′ over the entire circumference of the reinforcing frame 70.

The synthetic resin pallet of this embodiment is provided with a large opening in the lower plate-like portion 2 below the portion where the fork insertion port 6 intersects so that the pallet can be transported by a hand lifter. 1 is a single-sided use type that can place an article only on the upper surface 1, but the present invention is directed to a double-sided use type synthetic resin pallet that can place an article on both the upper plate 1 and the lower plate 2. It can also be applied to Further, in this embodiment, the fork is inserted from all sides, and the present invention is applicable to a two-way synthetic resin pallet in which the fork is inserted from two sides.

The reinforcing frame 70 has only to have a shape corresponding to the fork insertion opening, and the shape is not particularly limited. However, it is preferable that the cross section be rectangular in view of ease of production and the degree of the reinforcing effect.

As described above, in the synthetic resin pallet of the above embodiment, the hollow reinforcing frame 70 surrounding the fork insertion port 6 is formed, so that the fork insertion can be performed without increasing the weight of the synthetic resin pallet. The strength near the mouth 6 can be increased.

In the synthetic resin pallet of this embodiment, the non-slip tapes 81 and 82 are provided on the horizontal bars 71 and 72 on the upper and lower parts of the reinforcing frame 70 which is hardly deformed by the load and has high strength. Therefore, when the articles are placed on a synthetic resin pallet for transportation or when the articles are placed on a synthetic resin pallet and stacked in multiple stages, an excellent anti-slip effect is exhibited.

Further, in the synthetic resin pallet of the present embodiment, the hollow portions 70 'are formed inside the upper and lower horizontal bars 71, 72, so that the molding distortion is reduced despite the thickness. As a result, the surfaces of the upper and lower horizontal rails 71 and 72 can be smoothed, whereby the surfaces of the non-slip tapes 81 and 82 provided on the upper and lower horizontal rails 71 and 72 become smoother and smoother. The stopping effect can be further improved.

[Second Embodiment] Next, FIGS. 9 to 12 show a second embodiment of the present invention, in which parts corresponding to those of the first embodiment are denoted by the same reference numerals and description thereof is omitted. . In the first embodiment, the hollow portion 70 'is formed over the entire periphery of the reinforcing frame 70 as shown in FIG. 6, but in this embodiment, a part of the reinforcing frame 70 is formed as shown in FIG. The main difference is that only the hollow portion 70 'is formed.

As shown in FIGS. 10 and 11, the reinforcing frame 70 of the second embodiment has an upper horizontal bar 71, vertical bars 73 and 74, and a lower horizontal bar 72c surrounding four sides of the fork insertion opening 6. In this embodiment, the lower horizontal rail 7
Only the both ends of 2c are hollow, and the vertical bars 73, 7
4 is connected to each hollow part. Thereby, the reinforcing frame 7
The four corners 0 are all hollow structures having high strength.

On the other hand, the portion of the lower horizontal bar 72c except for both ends has a solid structure. Further, as compared with the upper horizontal bar 71 and the vertical bars 73 and 74, as shown in FIGS. The width has been reduced.
In this embodiment, as shown in FIG.
Although c is formed along one side in the width direction of the reinforcing frame 70, the present invention is not limited to this configuration, and the lower horizontal bar 72c may be formed along the center line of the reinforcing frame 70 as shown in FIG. Good.

In the examples shown in FIGS. 12 and 13,
Although both ends of the lower horizontal bar 72c that intersect with the vertical bars 73 and 74 are made thicker, both ends of the lower horizontal bar 72c may be made thinner as shown in FIG.

The ratio W2 / W1 of the width W2 of the central portion of the lower horizontal bar 72c to the width W1 of the upper horizontal bar 71 is 0.3 to 0.3.
0.8, more preferably 0.4 to
0.6. Within this range, the balance between strength and ease of molding is good.

According to the second embodiment, it is not necessary to form the hollow portion 70 ′ over the entire circumference of the reinforcing frame 70, so that a high gas pressure or a pool of water as shown in FIG. 7 is used. Without this, the reinforcing frame 70 can be easily injection-molded. Further, since the four corners of the reinforcing frame 70 have a hollow structure with high rigidity, there is no inferiority in strength even if the central portion of the lower horizontal bar 72c has a solid structure. Further, since the wide upper horizontal bar 71 is an article mounting surface, the non-slip tapes 81 and 82 can be easily applied, and the strength of the hollow structure can be effectively utilized.

In the second embodiment, the upper horizontal rail 71
Although the vertical bars 73 and 74 have a hollow structure, the lower horizontal bar 72c and the vertical bars 73 and 74 may have a hollow structure so that the width of the upper horizontal bar 71 may be reduced. By providing one of the bars 73, 74, the upper horizontal bar 71, one of the vertical bars 73, 74, and the lower horizontal bar 72c may have a hollow structure.

In the second embodiment, the lower horizontal rail 72
The hollow portion 70 'has reached both ends of the hollow portion c.
0 'may be set to the middle between the vertical bars 73 and 74. In this case, it is preferable to reduce the width of the solid structure portion having no hollow portion as described above.

[Third Embodiment] Next, FIG. 15 shows a third embodiment of the present invention, and portions corresponding to those of the first and second embodiments are denoted by the same reference numerals. Is omitted. In the first embodiment and the second embodiment, the reinforcing frame 70 is formed only between the spar 3 at the four corners and the spar 4 at the center of the side. However, in the third embodiment, the reinforcing frame 70 is formed at the center of the side. A reinforcement frame 70 is also formed between each of the spar 4 and the spar 5 at the center of the pallet. The structure of the added reinforcing frame 70 has the same structure as either the reinforcing frame 70 of the first embodiment or the reinforcing frame 70 of the second embodiment. Some reinforcing frames 70 may have the same structure as the first embodiment, and other reinforcing frames 70 may have the same structure as the second embodiment.

In the first and second embodiments, the reinforcing frame 70 is arranged as shown in FIG. 16, whereas in the third embodiment, as shown in FIG.
Since the number of the pallets is doubled, it is possible to prevent deformation of the peripheral portion of the fork insertion port 6 and to increase the strength of the synthetic resin pallet.

FIGS. 16 and 17 show a four-sided pallet, but if it is a two-sided pallet, FIG.
The reinforcing frame 70 may be arranged as shown in FIG.

[Fourth Embodiment] FIG. 20 shows a fourth embodiment of the present invention.
FIG. 3 is a partially broken perspective view showing a reinforcing frame 70 of the embodiment. In the first and second embodiments, the reinforcing frame 70
Are aligned on the same plane, the upper horizontal bar 71 and the vertical bar 73,7
4 and the lower horizontal bar 72 (or 72c), but such a configuration necessitates the use of a slide core during injection molding.

Therefore, in the fourth embodiment, the reinforcing frame 70 can be formed without using a slide core by alternately arranging the upper horizontal bar 71 and the lower horizontal bar 72c as viewed in the vertical direction. ing. Thereby, the molding efficiency can be further increased. That is, the gas blown from the center of the upper horizontal bar 71 passes through the vertical bars 73 and 74 which are a part of the vertical wall, and the lower horizontal bar 72 (alternately arranged in the vertical direction with the upper horizontal bar 71). Or 7
2c), at least both ends of the lower horizontal bar 72 (or 72c) are made hollow.

In the example shown in FIG. 20, the thickness of the vertical bars 73 and 74 is the same as that of the vertical wall.
It is also possible to make the wall thicker than the vertical wall, as shown in a perspective view taken along line CC in FIG. If the wall thickness is increased in this manner, it becomes easy to form the hollow portion 70 'in the reinforcing frame 70, and the strength of the vertical bars 73, 74 also increases.

The structure as shown in FIGS. 20 to 22 is particularly useful when the reinforcing frame 70 is formed between the girder 4 at the center of the side and the girder 5 at the center of the pallet in the third embodiment. is there. This is because the farther from the opening end of the fork insertion opening 6, the more difficult it is to use a slide core or the like.

[0062]

EXAMPLES [Experiment 1] Bars having the cross-sectional shapes shown in FIGS. 26 to 31 were molded from polypropylene, and the second moment of area was measured to compare the bending strength. Table 1 shows the results.
From the results shown in Table 1, when the hollow structure is used as shown in FIG. 27, the strength is hardly reduced as compared with the case of FIG. 26 which is not hollow, and compared with the conventional structure shown in FIGS. 28 and 29. It was found that the strength could be greatly improved.

[0063]

[Table 1]

[Experiment 2] Actually, a synthetic resin pallet having a reinforcing frame 70 was molded, and two test pieces 1 having a length of 200 mm were cut out from a hollow upper horizontal bar 71. On the other hand, two test bars 2 having a U-shaped cross section were cut out from a conventional synthetic resin pallet having a U-shaped cross-section instead of the reinforcing frame 70 and having the same dimensions as the others. The dimensions of the test piece 1 were 200 mm in length, 36.0 mm in left and right width, and 3 in upper and lower width.
It was 5.0 mm and the thickness was 4.0 mm. The dimensions of the test piece 2 were 200 mm in length, 36.0 mm in left and right width, and 3 in upper and lower width.
It was 5.0 mm and the thickness was 4.0 mm.

The amount of deflection (mm) when both ends of both test pieces 1 and 2 are supported, and a load of 200 kgf is applied to the center,
The load (kgf) required for displacing the center by 5 mm was measured. Table 2 shows the results. The upper row is the first one, the lower row is 2
This is the result of the first run.

[0066]

[Table 2]

As shown in Table 2, in the test piece 1, the test piece 2
, The bending strength was improved by 35 to 40%. Therefore, a significant improvement in the strength of the entire pallet is expected.

[0068]

As described above, the present invention relates to a synthetic resin pallet used for carrying and storing articles.
Since at least a part of the reinforcing frame having a hollow structure is formed so as to surround the fork insertion opening, the rigidity around the fork insertion opening can be particularly increased, and the strength of the entire pallet can be increased. In addition, since at least a part of the reinforcing frame has a hollow structure, the weight of the pallet is less increased compared to the strength improvement rate, and the production efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing a synthetic resin pallet according to a first embodiment of the present invention.

FIG. 2 is a bottom view of the synthetic resin pallet of the first embodiment.

FIG. 3 is a front view of the synthetic resin pallet of the first embodiment.

FIG. 4 is a side view of the synthetic resin pallet of the first embodiment.

FIG. 5 is a sectional view taken along line AA in FIG. 1;

FIG. 6 is a sectional view taken along line BB in FIG. 1;

FIG. 7 is a cross-sectional view illustrating an example of the method for manufacturing the synthetic resin pallet of the first embodiment.

FIG. 8 is a sectional view showing a fixing structure of a non-slip seal in the synthetic resin pallet of the first embodiment.

FIG. 9 is a plan view showing a synthetic resin pallet according to a second embodiment of the present invention.

FIG. 10 is a cross-sectional view of the synthetic resin pallet of the second embodiment cut parallel to a fork insertion opening.

FIG. 11 is a cross-sectional view of a reinforcing frame in a synthetic resin pallet according to a second embodiment.

FIG. 12 is a bottom view of a reinforcing frame in the synthetic resin pallet of the second embodiment.

FIG. 13 is a bottom view of a reinforcing frame of a modified example.

FIG. 14 is a bottom view of a reinforcing frame of a modified example.

FIG. 15 is a plan view showing a synthetic resin pallet according to a third embodiment of the present invention.

FIG. 16 is a perspective view showing an arrangement of a reinforcing frame according to the second embodiment of the present invention.

FIG. 17 is a perspective view showing an arrangement of a reinforcing frame according to a third embodiment of the present invention.

FIG. 18 is a perspective view showing a modification of the present invention.

FIG. 19 is a perspective view showing a modification of the present invention.

FIG. 20 is a perspective view showing another embodiment of the reinforcing frame.

FIG. 21 is a perspective view showing another embodiment of the reinforcing frame.

FIG. 22 is a perspective view showing another embodiment of the reinforcing frame.

FIG. 23 is a perspective view showing the appearance of a conventional synthetic resin pallet.

FIG. 24 is a perspective view taken along line DD in FIG. 23.

FIG. 25 is a cross-sectional view showing a method for manufacturing a conventional synthetic resin pallet.

FIG. 26 is a sectional view of a test piece used for a strength test.

FIG. 27 is a sectional view of a test piece used for a strength test.

FIG. 28 is a sectional view of a test piece used for a strength test.

FIG. 29 is a sectional view of a test piece used for a strength test.

FIG. 30 is a sectional view of a test piece used for a strength test.

FIG. 31 is a sectional view of a test piece used for a strength test.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper plate-shaped part 2 Lower plate-shaped part 3,4,5 girder part 6 Fork insertion port 70 Reinforcement frame 70 'Hollow part 70a Gas blowing hole (gas introduction port) 71 Upper horizontal bar 72 Lower horizontal bar 73,74 Vertical bar 81, 82 Non-slip tape (anti-slip member) 81a Recess

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E063 AA02 BA05 CA01 CA21 EE01 EE11

Claims (5)

[Claims] An upper plate-like portion and a lower plate-like portion disposed in parallel with each other, and a plurality of girders connecting the upper plate-like portion and the lower plate-like portion; A pallet made of a synthetic resin having a fork insertion opening formed therein, wherein a reinforcing frame surrounding a cross section orthogonal to a fork insertion direction of the fork insertion opening is formed corresponding to the fork insertion opening,
A synthetic resin pallet, wherein a hollow portion is formed inside at least a part of the reinforcing frame. 2. The reinforcing frame includes an upper horizontal bar formed along the upper plate portion, a lower horizontal bar formed along the lower plate portion, and an upper horizontal bar and a lower horizontal bar. Having a pair of vertical bars, the upper horizontal bar,
The synthetic resin pallet according to claim 1, wherein at least three of the lower horizontal bar and the pair of vertical bars have a hollow portion communicating with each other. 3. A portion of the upper horizontal bar, the lower horizontal bar, and the pair of vertical bars that does not have a hollow portion therein has a width greater than a portion that has a hollow portion therein. 3. The synthetic resin pallet according to claim 2, wherein the pallet is small. 4. The synthetic resin pallet according to claim 2, wherein said upper horizontal bar, said lower horizontal bar, and said pair of vertical bars all have hollow portions communicating with each other. 5. A non-slip member for closing a gas inlet in the upper plate-shaped portion or the lower plate-shaped portion, wherein a gas introduction port communicating with the hollow portion is formed on an outer surface of the reinforcing frame. The synthetic resin pallet according to claim 1, wherein a pallet is attached.