palette

Abstract

To provide a pallet which has stable shape quality.SOLUTION: A pallet 10 has such a cylindrical structure that a plurality of side girder parts 20 positioned on both sides of a pair of fork insertion paths 90 penetrate in a vertical direction and have widths of 50 [mm] or less, wherein a middle position in a vertical direction of inward side walls 21 of the respective side girder parts 20 approaches a position closer to the outward side wall 22 than the end so that intervals between the inward side walls 21 and outward side walls 22 become narrower at a position closer to the middle position than the end in the vertical direction.SELECTED DRAWING: Figure 4

Description

Technical Field

[0019] ,

[0004] , A first aspect of the present invention is a resin pallet comprising a deck board and a plurality of beam sections projecting downward from the deck board and arranged in three rows and three columns, wherein the first horizontal end, the other end, and the central part are provided with lower end connecting walls that extend in a second horizontal direction perpendicular to the first horizontal direction and connect the lower ends of the beam sections, and there are no walls facing the deck board from below between the first horizontal end and the central part, and between the central part and the other end, wherein the corners between the side surfaces of the beam sections located at the first horizontal end and the other end, which are parallel to the first horizontal direction, and the lower surface of the deck board are sharp corners. , [Figure 4] , , , , [Figure 2] , , , , , , , , , , This application discloses a technology for manufacturing resin pallets using a mold with a simple structure. , , [Figure 5] , ,

[0005] , [Figure 3] , ، [Figure 1] , , , , , , , ,

[0020]

[0001] The present invention relates to a resin pallet To .

Background Art

[0002] As this type of pallet A resin pallet with multiple beams that protrude downward from the deck board and are arranged in a 3x3 grid. is known (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] This application discloses a technology for manufacturing resin pallets using a mold with a simple structure.

Means for Solving the Problems

[0005] A first aspect of the present invention is a resin pallet comprising a deck board and a plurality of beam sections projecting downward from the deck board and arranged in three rows and three columns, wherein the first horizontal end, the other end, and the central part are provided with lower end connecting walls that extend in a second horizontal direction perpendicular to the first horizontal direction and connect the lower ends of the beam sections, and there are no walls facing the deck board from below between the first horizontal end and the central part, and between the central part and the other end, wherein the corners between the side surfaces of the beam sections located at the first horizontal end and the other end, which are parallel to the first horizontal direction, and the lower surface of the deck board are sharp corners.

Brief Description of the Drawings

[0019] [Figure 1] Perspective view of the upper surface side of the pallet according to an embodiment of the present disclosure <( [Figure 2] Perspective view of the lower surface side of the pallet [Figure 3] Plan sectional view of the桁部<000004>(5) [Figure 4] Perspective view of a partially broken side桁部 at the longitudinal end [Figure 5] Front sectional view of the side桁部 at the longitudinal end

Mode for Carrying Out the Invention

[0020] *Note: There seems to be an error in the original text where "桁部" is used without proper definition. It's translated as "桁部" in the English text as well as it's not clear what it exactly refers to. If it's a specific technical term, it should be defined properly in the original text for a more accurate translation.*Hereinafter, a pallet 10 according to one embodiment of the present disclosure will be described with reference to Figures 1 to 5. The pallet 10 of this embodiment is an injection-molded resin product, and as shown in Figure 1, its planar shape is a rectangle, in which the vertical direction H1 is larger than the horizontal direction H2.

[0021] The deck board 11 of the pallet 10 has a rib structure and is provided with a plurality of vertical ribs 11A extending in the vertical direction H1 and a plurality of horizontal ribs 11B extending in the horizontal direction H2. In addition, the ends and center of the deck board 11 in the vertical direction H1 are provided with horizontally elongated reinforcing sections 12 in which the spacing between the horizontal ribs 11B is denser than that of the deck board 11 as a whole. Furthermore, the edges of both parts in the vertical direction H1 are provided with horizontally elongated outer edge reinforcing sections 13 in which the spacing between two horizontal ribs 11B included in the horizontally elongated reinforcing section 12 is further denser and the vertical ribs 11A are denser only between those two horizontal ribs 11B.

[0022] Furthermore, the edges of both ends of the deck board 11 in the horizontal direction H2 are provided with vertically elongated outer edge reinforcement sections 14, which are structured by extending the horizontally elongated outer edge reinforcement section 13 vertically. In addition, the central part of the deck board 11 in the horizontal direction H2 is provided with a vertically elongated central reinforcement section 15, in which the vertical ribs 11A are closely spaced and the top surface is covered with a top plate 15T. The top plate 15T is also provided with rectangular holes that are slightly smaller than the grids surrounded by the vertical ribs 11A and horizontal ribs 11B of the vertically elongated central reinforcement section 15.

[0023] As shown in Figure 1, cylindrical grip receiving tubes 16 are integrally formed on elongated outer edge reinforcement parts 13 near the corners of the deck board 11, and anti-slip members 16G are housed inside them, protruding slightly from the upper surface of the deck board 11. Also, as shown in Figure 2, a slope 11G is formed on the outer edge of the lower surface of the deck board 11, and a vertical display surface 11N is formed in a part of the area that serves as the entrance to the fork insertion passage 90, without the slope 11G. A sticker identifying the user or owner of the pallet 10 can be attached to the display surface 11N.

[0024] The four areas of the deck board 11 surrounded by the aforementioned reinforcing parts (reference numerals 12, 13, 14, and 15) are inner lattice sections 19 with larger grids in the rib structure than the reinforcing parts. In addition, each inner lattice section 19 has a rectangular tubular grip receiving cylinder 17 integrally formed at its lower position, and anti-slip members 17G are housed inside them, protruding slightly from the lower surface of the deck board 11.

[0025] The beam sections 20 and 30 of the pallet 10 are arranged in a 3x3 grid, positioned at the center of each outer edge of the four corners and four sides of the deck board 11, and at the center of the entire deck board 11, protruding downward from the deck board 11. In addition, only adjacent beam sections 20 and 30 in the lateral direction H2 are connected at their lower ends by a lower end connecting wall 40. The lower end connecting wall 40 has a structure in which the entire upper surface of a group of ribs 40L (see Figure 2) that intersect the rib structure is covered by an upper wall 40T (see Figure 1). Also, as shown in Figure 1, the central part of the upper wall 40T in the width direction (vertical direction H1) forms a horizontal section 40S, and on both sides in the width direction, there are inclined sections 40U that bend downward from the horizontal section 40S. Furthermore, as shown in Figure 2, cylindrical grip receiving tubes 46 are integrally formed on the ribs 40L of the four lower end connecting walls 40 located at both ends in the vertical direction H1, and anti-slip members (not shown) can be housed inside them.

[0026] In this embodiment, the pallet 10 allows a pair of forks from a hand lifter or forklift to be inserted under the deck board 11 from any direction in the vertical H1 and horizontal H2 directions. When multiple pallets 10 are laid out closely together, arranging the pallets 10 side by side in the shorter direction of the pallets 10 makes it easier to transport each pallet 10, so a pair of forks is inserted under the deck board 11 from the vertical H1 direction. Therefore, in this embodiment, the beam sections 20 on both sides of the pair of fork insertion passages 90 when inserting a pair of forks from the vertical H1 direction have a different structure from conventional pallets 10 in order to make the width of the pallet 10 more compact.

[0027] In other words, in this embodiment, the vertical direction H1 corresponds to the "first horizontal direction" in the claims, and the horizontal direction H2 corresponds to the "second horizontal direction" in the claims. Furthermore, when distinguishing between the girder sections 20 and 30, the girder sections 20 on both sides of the pair of fork insertion passages 90 when inserting a pair of forks from the vertical direction H1 are referred to as the "side girder sections 20," and the girder section 30 between the pair of fork insertion passages 90 is referred to as the "central girder section 30."

[0028] Furthermore, the planar shape of the aforementioned anti-slip members 17G is an elongated rectangle, and the four anti-slip members 17G are arranged in a rotationally symmetrical manner. In both cases, when the forks are inserted into the deck board 11 from the vertical direction H1 or from the horizontal direction H2, the anti-slip member 17G extending in the longitudinal direction of one fork and the anti-slip member 17G extending in the width direction of the other fork come into contact with each fork. In addition, the pallet 10 has a symmetrical structure in both the vertical direction H1 and the horizontal direction H2, except for the anti-slip members 17G and the grip receiving cylinder 17.

[0029] The following will primarily describe the structure of the girder sections 20 and 30. Figure 3(A) shows the planar cross-sectional shape of the girder sections 20 and 30 at the ends in the longitudinal direction H1, and Figure 3(B) shows the planar cross-sectional shape of the girder sections 20 and 30 in the center in the longitudinal direction H1. As shown in these figures, both girder sections 20 and 30 have a structure in which reinforcing ribs 24 and 34 are provided within the cylindrical walls 25 and 35. Furthermore, while the planar cross-sectional shape of the cylindrical wall 35 of the central girder section 30 is approximately square, the planar cross-sectional shape of the cylindrical wall 25 of the side girder section 20 is a rectangle that is elongated in the longitudinal direction H1.

[0030] Furthermore, in order to guide the forks into a pair of fork insertion passages 90, the cylindrical walls 25 and 35 of the girder sections 20 and 30 located at the ends in the vertical direction H1 are curved such that the side walls (reference numerals 21 and 31) of the cylindrical walls 25 and 35 of the girder sections 20 and 30 facing each other across the fork insertion passage 90 are curved to separate from each other at the ends on the outer surface side of the pallet 10.

[0031] The vertical and horizontal lengths L2 and L3 of the square in the planar cross-sectional shape of the cylindrical wall 35 of the central girder portion 30 are the same as the length L2 of the vertical direction H1 in the rectangular shape of the cylindrical wall 25 of the side girder portion 20, and both are, for example, 80 to 150 [mm]. Further, the length L1 of the horizontal direction H2 of the side girder portion 20 is 1 / 5 to 1 / 3 of the length L2 of the vertical direction H1, and is, for example, 50 [mm] or less (preferably 40 [mm] or less, more preferably 30 [mm] or less).

[0032] Also, the reinforcing rib 34 of the central girder portion 30 has a cross-shaped planar cross-section and bisects the inside of the cylindrical wall 35 in both the vertical direction H1 and the horizontal direction H2, while the reinforcing rib 24 of the side girder portion 20 bisects the inside of the cylindrical wall 25 only in the vertical direction H1. In addition, inside the cylindrical wall 35 of the central girder portion 30, a reinforcing rib 35L protruding from the inner surface of the cylindrical wall 35 is provided.

[0033] As shown in FIG. 1, the cylindrical wall 35 of the central girder portion 30 has a structure in which the upper surface is closed by the aforementioned top plate 15T and the entire lower surface is open. On the other hand, as shown in FIGS. 4 and 5, the cylindrical wall 25 of the side girder portion 20 has the entire upper surface and the entire lower surface open and penetrates vertically.

[0034] Also, as shown in FIGS. 4 and 5, of the inner side wall 21 and the outer side wall 22 facing each other in the horizontal direction H2 of the cylindrical wall 25 of the side girder portion 20, the outer side wall 22 has a flat plate shape, while the inner side wall 21 has a shape in which the middle portion in the vertical direction is cut by the fork insertion path 90, and the detailed shape thereof is different between the side girder portion 20 arranged at the end of the vertical direction H1 and the side girder portion 20 arranged in the center.

[0035] Specifically, as shown in Figure 4, at the side girder section 20 at the end in the vertical direction H1, the upper and lower intermediate portion of the inward-facing side wall 21 is bent in a crank shape to correspond to the fork insertion passage 90. The inward-facing side wall 21 has a structure comprising: a first vertical section 21A that is parallel to the outward-facing side wall 22 above the fork insertion passage 90; a horizontal section 21B that is bent at a right angle from the lower end of the first vertical section 21A toward the outward-facing side wall 22; a second vertical section 21C that is bent at a right angle approximately vertically downward from the end of the horizontal section 21B toward the outward-facing side wall 22; an arc section 21D that curves away from the outward-facing side wall 22 from the lower end of the second vertical section 21C; and a third vertical section 21E that curves vertically downward from the end of the arc section 21D toward the outward-facing side wall 22 and is located directly below the first vertical section 21A. Furthermore, the arc portion 21D gives the lower corner of the fork insertion passage 90 on the side beam portion 20 a rounded chamfered shape, while the horizontal portion 21B and the second vertical portion 21C give the upper corner of the fork insertion passage 90 on the side beam portion 20 a sharp corner shape.

[0036] On the other hand, as shown in Figure 5, the central side girder section 20 in the vertical direction H1 has the same first vertical section 21A as the end side girder section 20, a curved section 21F that curves downward from the lower end of the first vertical section 21A as it approaches the outward side wall 22, and a second vertical section 21G that extends from the lower end of the curved section 21F to the lower end of the side girder section 20. The curved section 21F gives the upper corner of the fork insertion passage 90 on the side girder section 20 a rounded chamfered shape.

[0037] Furthermore, the lower corner of the fork insertion passage 90 on the side girder section 20 side is also rounded in shape, and the end of the upper wall 40T of the lower end connecting wall 40 in the lateral direction H2 is provided with an arc-shaped curved section 42 that rises up and is connected to the second vertical section 21G. Similarly, the central girder section 30 at the center and end in the vertical direction H1 is also provided with an arc-shaped curved section 41 rising from the upper wall 40T and connected to the side wall 31 of the central girder section 30, so that the lower corner of the fork insertion passage 90 on the central girder section 30 side is rounded in shape.

[0038] Furthermore, with respect to the central girder section 30 in the vertical direction H1, as shown in Figure 5, the upper corner on the central girder section 30 side of the fork insertion passage 90 is also given an R-chamfered shape. Corner protrusions 43 extend from the side wall 31 of the central girder section 30, and corner extensions 11C extend from multiple transverse ribs 11B included in the transverse reinforcing section 12, forming a continuous R-chamfered surface 11D on these corner protrusions 43 and corner extensions 11C.

[0039] On the other hand, with respect to the central girder section 30 at the end in the vertical direction H1, as shown in Figure 4, the upper corner on the central girder section 30 side of the fork insertion passage 90 has a sharp corner shape, and the lower surfaces of the multiple transverse ribs 11B included in the transverse reinforcing section 12 and the side wall 31 of the central girder section 30 are perpendicular to each other, without having the corner projection 43 and the corner extension 11C.

[0040] As shown in Figure 4, on the inner surface of the side girder section 20 at the end in the vertical direction H1, an inner surface projection 29 is formed that slightly protrudes from the inner surface of the side girder section 20 at approximately the center in the vertical direction. Also, as shown in Figure 5, on the inner surface of the side girder section 20 at the center in the vertical direction H1, an inner surface projection 29 is formed that slightly protrudes from the inner surface of the side girder section 20 at a position slightly below the approximately center in the vertical direction. These inner surface projections 29 are formed by the gap in the joint surface between the first molded projection and the second molded projection, which will be described later. In other words, the inner surface projections 29 serve as parting lines between the molds within each side girder section 20. Furthermore, in Figures 4 and 5, the portion of the inner surface of the inward-facing side wall 21 that appears to be parallel to the vertical direction is inclined so that it gradually moves away from the inner surface of the outward-facing side wall 22 as it moves away from the inner surface projection 29 upwards and downwards.

[0041] This concludes the explanation of the structure of the pallet 10 in this embodiment. The pallet 10 in this embodiment is manufactured using a resin injection molding die. The injection molding die, although not shown in the figure, includes first and second molds that open and close in the vertical direction of the pallet 10, a pair of first slide molds that move closer to and further apart from each other in the vertical direction H1 and mold the outer surface of the pallet 10 facing the vertical direction H1, and have a pair of rectangular prisms which form the inner surface of a pair of fork insertion passages 90, and a pair of second slide molds that move closer to and further apart from each other in the horizontal direction H2 and mold the opposing surfaces of adjacent side beam sections 20 in the vertical direction H1. The inner surfaces of the beam sections 20 and 30 are formed by molding protrusions that project from the first and second molds in the vertical direction of the pallet 10.

[0042] Specifically, the molded projection (not shown) that forms the inner surface of the central girder section 30 (hereinafter referred to as the "molded projection for the central girder section 30") has a structure in which rectangular prisms are arranged in two rows and two columns, as shown in the shape of the part of the central girder section 30 that does not have a resin wall as shown in Figure 3. Furthermore, since the cylindrical wall 35 of the central girder section 30 is closed at the top surface by the top plate 15T, the molded projection for the central girder section 30 protrudes from one of the first or second molds and has a length that extends from the lower end of the central girder section 30 to the lower surface of the top plate 15T.

[0043] In contrast, the molded projection (not shown) that forms the inner surface of the side girder section 20 (hereinafter referred to as the "molded projection for the side girder section 20") has a structure in which two rectangular prisms are placed side by side, as shown in Figure 3 for the part of the side girder section 20 that does not have a resin wall, and these rectangular prisms of the molded projection for the side girder section 20 are thinner than the rectangular prisms of the molded projection for the central girder section 30. Furthermore, taking advantage of the fact that the cylindrical wall 25 of the side girder section 20 penetrates vertically, the molded projection for the side girder section 20 consists of a first molded projection that protrudes from the first mold and a second molded projection that protrudes from the second mold. The tip surfaces of these first and second molded projections are joined at an intermediate position in the vertical direction of the side girder section 20, and the aforementioned inner surface projection 29 is formed as a trace of this joining. Thus, the molded protrusion for the side beam section 20 is divided into a first molded protrusion and a second molded protrusion in the opening and closing directions of the first and second molds, making it shorter than the molded protrusion for the central beam section 30. As a result, the molded protrusion for the side beam section 20 is thinner than the molded protrusion for the central beam section 30, but deformation due to resin pressure is suppressed. Moreover, since the side beam section 20 has a structure in which the middle part in the vertical direction is carved out by the fork insertion passage 90, in the central side beam section 20 in the vertical direction H1, both the first molded protrusion and the second molded protrusion have a structure in which the base end is thicker than the tip, and this also suppresses deformation of the first molded protrusion and the second molded protrusion due to resin pressure. Furthermore, at the side beam portion 20 at the end in the vertical direction H1, one of the first molded protrusion and the second molded protrusion has a structure where the base end is thicker than the tip end, but their joint surfaces are arranged such that the other is shorter than the other. This also balances the strength of the first molded protrusion and the second molded protrusion, suppressing deformation due to resin pressure.

[0044] As described above, the pallet 10 of this embodiment has a cylindrical structure in which the side beam portion 20 penetrates vertically. Therefore, the molding protrusions for forming the inner surface of the side beam portion 20 can be divided into a first molding protrusion and a second molding protrusion that face each other in the die opening direction of the injection molding die, making them shorter than conventional designs. As a result, even with a pallet 10 equipped with a thinner-than-usual side beam portion 20, deformation of the first and second molding protrusions formed inside the side beam portion 20 due to resin pressure is suppressed. Moreover, the distance between the inward-facing side wall 21 and the outward-facing side wall 22 that face each other in the lateral direction H2 of each side beam portion 20 becomes narrower at intermediate positions than at both ends in the vertical direction of the side beam portion 20. Since the intermediate positions of the inward-facing side wall 21 are closer to the outward-facing side wall 22 than at both ends in the vertical direction of the inward-facing side wall 21, the first and second molding protrusions can be made thicker at the base end than at the tip end. These also increase the bending strength of the first and second molding protrusions and suppress deformation of the molding protrusions due to resin pressure. Furthermore, by suppressing deformation of the molded protrusions due to resin pressure, the shape quality remains stable even when the width of the side beam section 20 is 50 mm or less, as in the pallet 10 of this embodiment. In addition, since the width of the side beam section 20 is 50 mm or less in the pallet 10, the overall width of the pallet 10 (width in the horizontal direction H2) can be reduced by 100 mm or more compared to a typical conventional pallet 10 whose width is 100 mm or more, making it possible to lay out the pallets 10 efficiently.

[0045] Furthermore, in the pallet 10 of this embodiment, the width of the pallet 10 can be reduced by making the fork insertion passage 90 bite into the side girder section 20 to the point where the intermediate region of the inward-facing side wall 21, located to the side of the fork insertion passage 90, is offset towards the outward-facing side wall 22 from the upper region located above it. In addition, since a curved section 21F is provided between the upper region and the intermediate region of the inward-facing side wall 21 so that the upper corner on the side girder section 20 side has an R-chamfered shape, water is less likely to accumulate between the intermediate region and the upper region of the inward-facing side wall 21, and stress concentration is also prevented.

[0046] In this embodiment, the pallet 10 has a rounded chamfer shape at the middle of the pair of fork insertion passages 90 when viewed from the vertical direction H1, while it has a sharp corner shape at both ends of the vertical direction H1. Therefore, compared to a case where the upper corners of the fork insertion passages 90 are rounded chamfered at all locations, the amount of undercuts is reduced, and the mold structure is simplified.

[0047] [Other embodiments] (1) In the above embodiment, the upper and lower intermediate portion of the side beam 20, which has a width of 50 mm or less, was carved out by the fork insertion passage 90. However, the overall width of the pallet may be reduced by carving out the upper and lower intermediate portion of the side beam, which has a width of 50 mm or more (for example, 100 mm), by the fork insertion passage.

[0048] (2) In the above embodiment, the pallet 10 was connected only between the lower ends of adjacent girder sections 20 and 30 in the lateral direction H2 by the lower end connecting wall 40, but the lower ends of adjacent girder sections in the vertical direction H1 may also be connected by the lower end connecting wall, or the entire lower surface of the pallet may be covered by a single plate.

[0049] (3) Although the pallet 10 in the above embodiment had a rectangular planar shape, it may also be square.

[0050] (4) In the pallet 10 of the above embodiment, the side beam portion 20 was shaped as if it had been cut out by the fork insertion passage 90, but in the pallet 10 of the above embodiment, the side beam portion 20 does not have to be shaped as if it had been cut out by the fork insertion passage 90.

[0051] (5) In the pallet 10 of the above embodiment, a pair of fork insertion passages 90 were partitioned by a plurality of central beam sections 30 in the center of the lateral direction H2 of the pallet 10. However, the central beam sections 30 may be removed from the center of the lateral direction H2, and the pair of fork insertion passages 90 may not be partitioned.

[0052] (6) In the pallet 10 of the above embodiment, a pair of forks could be inserted not only from the vertical direction H1 but also from the horizontal direction H2. However, it is also possible to make it so that a pair of forks can only be inserted from the vertical direction H1. Specifically, at both ends of the horizontal direction H2 of the pallet 10, a pair of side beams 20 may be extended over the entire length of the vertical direction H1, so that a pair of forks can only be inserted from the vertical direction H1. In this case as well, the central beam 30 may be removed from the central part of the horizontal direction H2, so that the fork insertion passage 90 is not partitioned.

[0053] While this specification and drawings disclose specific examples of the technology included in the claims, the technology described in the claims is not limited to these specific examples, but also includes various modifications and changes to these examples, as well as parts of the examples taken individually. [Explanation of symbols]

[0054] 10 pallets 11 Deck Boards 20 Side beam section 21 Inward facing side wall 21F Curved section 22 Outward facing sidewall 30 Central girder section 30,40 digit part 31 Side wall 40 Lower end connecting wall 90 Fork insertion path H1 Vertical direction (first horizontal direction) H2 Horizontal direction (second horizontal direction)

Claims

[Claim 1] A resin pallet comprising a deck board and a plurality of beam sections that protrude downward from the deck board and are arranged in a 3x3 grid, The deck board has a rib structure in which a plurality of vertical ribs extending in a first horizontal direction and a plurality of transverse ribs extending in a second horizontal direction perpendicular to the first horizontal direction intersect. At one end, the other end, and the central portion of the first horizontal section, there is a lower end connecting wall that extends in the second horizontal direction and connects the lower ends of the girder sections. In a pallet in which there is no wall facing the deck board from below between the first horizontal end and the central part, and between the central part and the other end, The corners between the side surface of the girder portion located at one end and the other end in the first horizontal direction, which is parallel to the first horizontal direction, and the lower surface of the deck board, are not chamfered. The corners between the lower surfaces of the plurality of transverse ribs and the side surfaces of the girder sections located in the central part of the first and second horizontal directions are chamfered to form rounded surfaces, and a corner projection is formed on the side surface of the girder section at a position between adjacent transverse ribs, having a curved surface that is flush with the upper surface located below the lower surface of the transverse ribs and the rounded surface, and which is pointed toward the front.

Images