Pallet

Abstract

To increase strength while suppressing an increase in the weight of a girder part at the center of a pallet.SOLUTION: The pallet 10A has a structure in which the inside of a central girder part 70 is partitioned into a total of five rooms comprising a central room 21R and four peripheral room walls around the central room 22R by a plurality of in-girder partition walls 20. The plurality of in-girder partition walls 20 are arranged so that the four peripheral room side walls are rotationally symmetric around the central room side 22R, and a plurality of groove side walls 62B extended from the plurality of in-girder partition walls 20 to four outer sides of the outer cylinder 21R 70S are bridged between the girder parts. Further, the upper surfaces or lower surfaces of a plurality of groove side walls 62B and 82B extended from the in-girder partition walls 20 to the four outer sides of the 70S of the outer cylinder wall are arranged flush with the upper surfaces or lower surfaces which are the outer surfaces of the end parts of the in-girder partition walls 20.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a pallet that has beams at a total of nine locations, including the center, four corners, and the middle parts of each outer edge of the pallet, and that allows forks to be inserted from two directions. [Background technology]

[0002] A known conventional pallet of this type has a structure in which the interior of the central beam is divided into two rows and two columns of rooms by two crossing internal beam partition walls, and each of these rooms is further divided into smaller sections at the top of the beam (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-107651 A (Fig. 1, 27) Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the conventional pallets described above, the strength of the central beam can be a problem. However, simply increasing the number of partition walls within the central beam to create a structure that divides the space into rooms with two rows and three columns or more results in increased weight. Therefore, this application discloses a technology that can increase the strength of the central beam of the pallet while suppressing the increase in weight. [Means for solving the problem]

[0005] One aspect of the invention of the present disclosure made to solve the above-mentioned problems is a pallet that has girder sections with inner walls within an outer cylindrical wall at a total of nine locations, including the center, the four corners, and the middle parts of each outer edge, and that allows forks to be inserted from two perpendicular directions, and that is equipped with a plurality of inner girder partition walls that are included in the inner wall of the central girder and divide at least a portion of the planar cross-sectional shape of the central girder in the vertical direction into a central room located at the center and four peripheral rooms that are arranged rotationally symmetrically around the central room and extend from one end of each side of the outer cylindrical wall to a position near the other end, end outer surfaces that are provided on the plurality of inner girder partition walls and form part of the upper or lower surface of the entire pallet, and a plurality of inter-girder ribs that extend from the plurality of inner girder partition walls to the four outer sides of the outer cylindrical wall, bridging between the central girder and the girders on each side, and have outer surfaces that are flush with the end outer surfaces of the inner girder partition walls. [Effects of the Invention]

[0006] In the pallet according to one embodiment of the present disclosure, at least a portion of the central girder section in the vertical direction is divided by multiple intra-girder partition walls into five rooms, consisting of a central room and four surrounding rooms. That is, within the central girder section, the multiple intra-girder partition walls are a core cylindrical wall surrounding the central room and protruding walls extending from the core cylindrical wall on all four sides and connected to the outer cylindrical wall. As a result, the pallet according to the present disclosure is roughly structured as if a core cylindrical wall had been added to the center of the central girder section of a conventional pallet, thereby increasing the strength of the central girder section compared to conventional pallets. Furthermore, the pallet according to the present disclosure reduces the increase in the number of intra-girder partition walls compared to a conventional pallet simply adding more intra-girder partition walls to divide it into two or more rooms in three or more rows. In other words, the pallet according to the present disclosure makes it possible to increase the strength of the central girder section while minimizing the weight increase. In addition, the multiple intra-girder partition walls are arranged so that the four peripheral rooms are rotationally symmetrical around the central room, and multiple inter-girder ribs extending from the multiple intra-girder partition walls to the four outer sides of the outer cylindrical wall bridge between the girders, so that bending stress caused by loads received by the pallet from forks or cargo is distributed throughout the pallet.Furthermore, the outer surfaces of the end portions of the multiple intra-girder partition walls, which form part of the upper or lower surface of the entire pallet, are flush with the outer surfaces of the multiple inter-girder ribs, so that the load received by the upper or lower surface of the pallet from the cargo or floor can be supported by the inter-girder ribs and intra-girder partition walls. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view of a pallet according to a first embodiment of the present disclosure. [Figure 2] Figure 2 is a perspective view of the underside of the pallet. [Figure 3] FIG. 3A is a perspective view of the underside of the central girder, and FIG. 3B is a partially cutaway perspective view of the lower part of the central girder. [Figure 4] FIG. 4A is a partially cutaway perspective view of a cross section of a vertically intermediate portion of the central girder, as viewed from below, and FIG. 4B is a partially cutaway perspective view of the same cross section, as viewed from above. [Figure 5] Figure 5 is a partially cutaway perspective view of the upper part of the central girder. [Figure 6] Figure 6 is a perspective view of the top side of the central girder. [Figure 7] 10 is a perspective view of the upper surface side of the central beam portion of the pallet of the second embodiment. [Figure 8] A plan cross-sectional view of the central beam of the pallet of the third embodiment DETAILED DESCRIPTION OF THE INVENTION

[0008] [First embodiment] A pallet 10A according to one embodiment of the present disclosure will be described with reference to Figures 1 to 6. As shown in Figure 1, the pallet 10A of this embodiment is, for example, a resin molded product molded entirely in one piece. Its planar shape is a rectangle that is longer in a second horizontal direction H2 perpendicular to a first horizontal direction H1, and it has beams at a total of nine locations: the center, the four corners, and the middles of each outer edge. The pallet 10A also has a pair of first fork insertion holes 91 that penetrate between the beams in the first horizontal direction H1, and a pair of second fork insertion holes 92 that penetrate between the beams in the second horizontal direction H2. The entire pallet 10A has a crosspiece structure that can be demolded in the vertical direction.

[0009] The pallet 10A may have a square planar shape, or may be formed such that an upper portion and a lower portion are separately molded from a midpoint in the vertical direction and then integrated by adhesion, welding, or the like.

[0010] Hereinafter, when distinguishing between multiple girder parts, the central girder part of pallet 10A will be referred to as the "central girder part 70," the girder parts at the four corners will be referred to as "corner girder parts 73," the girder parts located on both sides of the central girder part 70 in the first horizontal direction H1 will be referred to as the "first intermediate girder part 71," and the girder parts located on both sides of the central girder part 70 in the second horizontal direction H2 will be referred to as the "second intermediate girder part 72." Furthermore, when multiple types of girder parts are described together, they will be abbreviated as "girders 70-73," or the reference numerals will be omitted and they will simply be referred to as "girders."

[0011] As shown in FIG. 1, the girder sections 70-73 are structured with inner walls 70W-73W inside outer cylindrical walls 70S-73S, which are the same height as the entire pallet 10A. The outer cylindrical wall 70S of the central girder section 70 is, for example, a rectangular cylindrical shape with four chamfered corners and a square cross section, while the outer cylindrical walls 71S-73S of the other girder sections 71-73 are generally rectangular cylindrical shapes with partially curved surfaces. Furthermore, the planar shapes of the outer cylindrical walls 72S, 73S of the second intermediate girder section 72 and the corner girder sections 73 are longer in the second horizontal direction H2 than in the first horizontal direction H1, and the planar shape of the outer cylindrical wall 71S of the first intermediate girder section 71 is slightly longer in the first horizontal direction H1 than in the second horizontal direction H2. The side surfaces of the vertically and horizontally aligned girder sections are arranged so that they lie on the same plane. The shapes of the outer cylindrical walls 70S-73S are not limited to those described above.

[0012] As shown in Figure 2, the lower part of the pallet 10A is provided with a lower inter-girder connecting part 80 that extends from the center of the pallet 10A in the first and second horizontal directions H1, H2 to connect the lower ends of the girders, and a lower inter-girder connecting part 81 that extends along the outer edge of the pallet 10A to connect the lower ends of the girders. In addition, in the part surrounded on all sides by the lower inter-girder connecting parts 80, 81, a first fork insertion hole 91 and a second fork insertion hole 92 are open downward.

[0013] Lower inter-girder connecting section 81 extending along the outer edge of pallet 10A has a lattice-like structure with its upper surface covered by an upper wall 85 (see Figure 1). On the other hand, lower inter-girder connecting section 80 extending in all directions from the center of pallet 10A includes a plurality of (e.g., three) inter-girder beams 82 that form grooves with open bottoms and extend between girders, as shown in Figure 3A, and each inter-girder beam 82 has a plurality of reinforcing ribs 83 provided within it.

[0014] Incidentally, both widthwise ends of the lower inter-girder connecting sections 80, 81 are sloped to allow the rollers of a hand lifter to easily climb over them. In addition, multiple through holes are formed in the walls that intersect in the vertical direction, such as the top wall 85, the groove bottom wall 82A of the inter-girder beam 82, the groove bottom wall 62A described below, and the horizontal walls 30, 31, 32, to reduce weight.

[0015] As shown in Figure 1, the top of the pallet 10A is provided with an upper inter-girder connecting section 60 that extends from the center of the pallet 10A in the first and second horizontal directions H1 and H2 to connect the upper ends of the girders, and an upper inter-girder connecting section 61 that extends along the outer edge of the pallet 10A to connect the upper ends of the girders. In addition, a cargo receiving section 67 is provided in the area surrounded on all four sides by the upper inter-girder connecting sections 60 and 61.

[0016] The upper inter-girder connecting portion 61 and the cargo receiving portion 67 extending along the outer edge of the pallet 10A form a lattice structure. Moreover, the squares of the upper inter-girder connecting portion 61 are generally finer than those of the cargo receiving portion 67, and are therefore stronger than the cargo receiving portion 67.

[0017] On the other hand, the upper inter-girder connecting portion 60 extending in all directions from the center of the pallet 10A includes a plurality of (for example, four) inter-girder beams 62 that form square grooves with open bottoms and extend between the girders, as shown in Figure 3A, and each inter-girder beam 62 is provided with a plurality of reinforcing ribs 63. Also, when viewed from above, the plurality of inter-girder beams 82 of the lower inter-girder connecting portion 80 described above are arranged to fit between the inter-girder beams 62 of the upper inter-girder connecting portion 60.

[0018] The internal structure of the central girder 70 is as follows: The inner wall 70W of the central girder 70 includes four full-height, flat, intra-girder partition walls 20 shown in Figures 4A and 4B. These four intra-girder partition walls 20 are arranged on four imaginary partition lines that divide the interior of the outer cylindrical wall 70S into nine areas, arranged in three rows and three columns when viewed from above, dividing the interior of the outer cylindrical wall 70S into a central room 21R whose area is the same as one central area and four peripheral rooms 22R whose area is the same as two surrounding areas.

[0019] In other words, a rectangular cylindrical core wall 23 is formed at the center of the central girder section 70 by portions of the four intra-girder partition walls 20, and portions of the remaining four intra-girder partition walls 20 protrude from the four corners of the core cylindrical wall 23 as protruding walls 24. That is, when viewed from above, as shown in Fig. 4B, four protruding walls 24 protrude counterclockwise from four locations on the core cylindrical wall 23. These protruding walls 24 are perpendicular to the outer cylindrical wall 70S, dividing the interior of the outer cylindrical wall 70S into a central chamber 21R inside the core cylindrical wall 23 and four peripheral chambers 22R around it.

[0020] The side walls of the core tube wall 23 and the extending overhang walls 24 therefrom have different thicknesses, and their centers in the thickness direction are slightly offset from each other. In this embodiment, even if the centers in the thickness direction of the walls are offset from each other or the thicknesses of the walls are different, as long as portions of the walls in the thickness direction are located in the same plane, they can integrally support loads. Therefore, these walls are considered to be the same wall, or one wall is extended from the other. Also, in the above description, the multiple intra-girder partition walls 20 are provided as four flat plate-shaped walls, but the intra-girder partition wall 20 may also be considered to consist of one core tube wall 23 and four overhang walls 24. Also, the intra-girder partition walls 20 are not limited to being flat plate-shaped, and may be curved.

[0021] A plurality of inner walls 70W other than the inner girder partition walls 20 are provided at both the upper and lower ends of the central girder 70, further dividing the interior of the central girder 70 into smaller sections.

[0022] Specifically, as shown in Figure 5, at both upper and lower ends of the central girder 70, reinforcing walls 25 extend from the four corners of the core cylindrical wall 23 to the side opposite the protruding walls 24 and are connected to the outer cylindrical wall 70S. That is, at both upper and lower ends of the central girder 70, reinforcing walls 25 extending from each intra-girder partition wall 20 are provided at positions that overlap with the surrounding room 22R in the vertical direction and are connected to the outer cylindrical wall 70S. The upper and lower ends of the central girder 70 are then partitioned into rooms arranged in three rows and three columns by the multiple intra-girder partition walls 20 and multiple reinforcing walls 25.

[0023] In addition, at both the upper and lower ends of the central girder 70, each of the four rooms sandwiched between each reinforcing wall 25 and the protruding wall 24 is divided into three by a pair of reinforcing walls 26 that are parallel to the reinforcing walls 25 and extend between the core tube wall 23 and the outer tube wall 70S.

[0024] 3B, reinforcing walls 27 are provided at the lower end of the central beam 70 on the diagonal lines of the four corner rooms of the aforementioned 3×3 compartments. The reinforcing walls 27 are perpendicular to the chamfered walls 70C at the four corners of the outer cylinder wall 70S.

[0025] 4A and 4B, the reinforcing walls 25, 26, and 27 have a height of, for example, approximately 1 / 10 to 1 / 5 of the overall height of the central girder 70. Vertical ribs 25L, 26L, and 27L extend vertically from the inner surface of the outer tubular wall 70S and are continuous with the reinforcing walls 25, 26, and 27. The upper and lower reinforcing walls 25 are connected to each other by the vertical rib 25L, and the upper and lower reinforcing walls 26 are connected to each other by the vertical rib 26L. The vertical rib 27L extends continuously from the reinforcing wall 27 to the upper end of the central girder 70.

[0026] As shown in Figure 5, at the top of the pallet 10A, all of the intra-girder partition walls 20 and reinforcing walls 25, 26 of the central girder portion 70 are continuous with the groove side walls 62B of any of the inter-girder beams 62 around the central girder portion 70. Specifically, a total of four walls consisting of one intra-girder partition wall 20, one reinforcing wall 25, and two reinforcing walls 26 that are perpendicular to each side of the outer cylindrical wall 70S are continuous with the total of four groove side walls 62B of the two inter-girder beams 62. The top surfaces of the reinforcing walls 25, 26 and the groove side walls 62B of the inter-girder beams 62 are flush with each other and form part of the deck surface 90, which is the top surface of the pallet 10A.

[0027] 6 is stretched between the upper portions of the intra-girder partition wall 20 and the adjacent reinforcing wall 26, and between the upper portions of the reinforcing wall 25 and the adjacent reinforcing wall 26. A horizontal wall 32 is stretched at the upper end of the core tube wall 23. The horizontal walls 30, 32 and the upper surfaces of the groove bottom wall 62A of the inter-girder beam 62 are also flush with each other and form part of the deck surface 90.

[0028] In addition, a square opening is formed in the center of the horizontal wall 32 by rotating the core cylindrical wall 23 by 45 degrees, and a rectangular cylindrical wall 28 hangs down from the edge of the opening of the horizontal wall 32. A tag holder (not shown) that holds an RFID tag is fitted into the rectangular cylindrical wall 28.

[0029] As shown in Figure 5, two inter-girder beams 62 that are perpendicular to each other are connected at each corner of the central girder 70. Specifically, of the total four groove side walls 62B of the two orthogonal inter-girder beams 62, a pair of groove side walls 62B located on the far side are connected to both side edges of the chamfered wall 70C of the outer cylindrical wall 70S. The remaining pair of groove side walls 62B are located on extensions of the mutually perpendicular side surfaces of the outer cylindrical wall 70S. The pair of groove side walls 62B intersect with a diagonal rib 62L that protrudes outward from the center of the chamfered wall 70C in the width direction.

[0030] As shown in FIG. 3B , in the lower part of the pallet 10A, as in the upper part, all of the intra-girder partition walls 20 and reinforcing walls 25, 26 of the central girder portion 70 are continuous with the groove side walls 82B of any of the inter-girder beams 82 around the central girder portion 70. Specifically, of the four walls consisting of one intra-girder partition wall 20, one reinforcing wall 25, and two reinforcing walls 26 perpendicular to each side of the outer cylindrical wall 70S, two reinforcing walls 26 are continuous with both groove side walls 82B of the inter-girder beam 82 located at the center of the side of the outer cylindrical wall 70S in the width direction, and the intra-girder partition walls 20 and reinforcing walls 25 are continuous with a pair of groove side walls 82B on the closer sides of the inter-girder beam 82 located on both sides of the central inter-girder beam 82. The lower surfaces of the intra-girder partition walls 20, the reinforcing walls 25, 26, and the groove side walls 82B of the inter-girder beams 82 are arranged flush with each other and form part of the underside of the entire pallet 10A.

[0031] 3A, horizontal walls 30 are stretched between the lower portions of each pair of reinforcing walls 26. Furthermore, horizontal walls 31 are stretched at the four corners of the outer cylindrical wall 70S at the lower end of the room surrounded by the outer cylindrical wall 70S, the inner girder partition wall 20, and the reinforcing wall 25, and are connected to the horizontal walls 31. These horizontal walls 30, 31 are also arranged flush with each other and form part of the underside of the entire pallet 10A.

[0032] The structure of the pallet 10A of this embodiment has been described above, and the effects of this pallet 10A will now be described.

[0033] As shown in FIGS. 4A and 4B , the pallet 10A of this embodiment has a central girder section 70 that is divided into five rooms by multiple intra-girder partition walls 20: a central room 21R and four surrounding peripheral rooms 22R. That is, within the central girder section 70, the multiple intra-girder partition walls 20 are a core cylindrical wall 23 that surrounds the central room 21R and protruding walls 24 that protrude from the core cylindrical wall 23 in all directions and connect to the outer cylindrical wall 70S. As a result, the pallet 10A of this embodiment has a structure that roughly resembles a conventional pallet with a core cylindrical wall 23 added to the center of the central girder section, thereby increasing the strength of the central girder section 70. Furthermore, the pallet 10A of this embodiment requires fewer intra-girder partition walls 20 than a conventional pallet simply configured to divide the central girder section into two or more rows and three or more columns. In other words, the pallet 10A of this embodiment can increase the strength of the central girder section 70 while minimizing the weight increase.

[0034] In addition, the multiple intra-girder partition walls 20 are arranged so that the four peripheral rooms 22R are rotationally symmetrical around the central room 21R, and the multiple groove side walls 62B extending from the multiple intra-girder partition walls 20 to the four outer sides of the outer cylindrical wall 70S bridge between the girder sections, so that bending stress due to loads received by the pallet 10A from forks or cargo is distributed throughout the pallet 10A. Furthermore, the upper or lower surfaces of the multiple groove side walls 62B, 82B extending from the intra-girder partition walls 20 to the four outer sides of the outer cylindrical wall 70S are arranged flush with the upper or lower surface, which is the outer end surface, of the intra-girder partition wall 20, so that the load received by the upper or lower surface of the pallet from the cargo or floor can be supported by the inter-girder ribs and the intra-girder partition walls 20.

[0035] Furthermore, since the reinforcing walls 25, 26, 27 are unevenly distributed at the vertical end of the central girder 70, which is most susceptible to deformation, effective reinforcement can be achieved.

[0036] In addition, in the pallet 10A of this embodiment, the multiple intra-girder partition walls 20 are arranged on a portion of each of four imaginary partition lines that divide the central girder section 70 into a total of nine areas of three rows and three columns, so that the multiple intra-girder partition walls 20 have a simple structure and the cost of the resin molding mold for forming the pallet 10A can be reduced.

[0037] In this embodiment, the groove side walls 62B, 82B, which are part of the inter-girder beams 62, 82, are "inter-girder ribs" that are continuous with the intra-girder partition wall 20 and the reinforcing walls 25, 26 and are laid between the girder sections, but the "inter-girder ribs" may be part of an inter-girder beam with an L-shaped or T-shaped cross section, or may simply be strips laid alone between the girder sections.

[0038] [Second embodiment] 7, the pallet 10B of this embodiment has a structure in which a plurality of vertical ribs 23L are added to the central beam 70 of the pallet 10A of the first embodiment. The plurality of vertical ribs 23L are provided corresponding to the plurality of vertical ribs 26L described in the first embodiment, and each vertical rib 23L is provided in the same plane as the corresponding vertical rib 26L, protrudes from the outer surface of the core cylindrical wall 23, and extends over the entire core cylindrical wall 23 in the up-down direction.

[0039] [Third embodiment] The pallet 10C of this embodiment, shown in FIG. 8, differs from the pallet 10A of the first embodiment in the structure of the core tube wall 23C. Specifically, the core tube wall 23C of the pallet 10C of this embodiment has an octagonal cross section formed by chamfering the four corners of the core tube wall 23 of the pallet 10A of the first embodiment. Furthermore, reinforcing walls 26 are located on both sides of each of four outer surfaces, every other one of the eight outer surfaces of the core tube wall 23C. That is, in the pallet 10C of this embodiment, the intra-girder partition wall 20 is composed of an octagonal, rectangular core tube wall 23C and a plurality of protruding walls 24 extending counterclockwise from every other side wall of the core tube wall 23C and connected to the outer tube wall 70S.

[0040] <Additional Notes> The following describes the features extracted from the above embodiment, while indicating, as necessary, the effects, etc. Note that, for ease of understanding, the corresponding configurations in the above embodiment are indicated in parentheses as appropriate below, but these features are not limited to the specific configurations indicated in parentheses.

[0041] [Feature 1] In a pallet (10A-10C) having girder sections (70-73) with inner walls (70W-73W) inside outer cylindrical walls (70S-73S) at a total of nine locations consisting of the center, the four corners, and the intermediate portions of each side of the outer edge, and into which forks can be inserted from two orthogonal directions (H1, H2), the inner wall (70W) of the central girder section (70) is included, and the horizontal cross-sectional shape of at least a part of the vertical direction of the central girder section (70) is formed by a central chamber (21R) located at the center and arranged in rotational symmetry around the central chamber (21R), and extending from one end of each side of the outer cylindrical wall (70S) to the other. A pallet (10A to 10C) comprising: a plurality of intra-girder partition walls (20) that divide the pallet into four surrounding rooms (22R) extending to positions near the ends; end outer surfaces that are provided on the plurality of intra-girder partition walls (20) and form part of the upper or lower surface of the entire pallet (10A to 10C); and a plurality of inter-girder ribs (62B, 82B) that extend from the plurality of intra-girder partition walls (20) to the four outer sides of the outer cylindrical wall (70S), bridge between the central girder section (70) and the girder sections (71, 72) on each side thereof, and have outer surfaces that are flush with the end outer surfaces of the intra-girder partition walls (20).

[0042] In the pallet of Feature 1, at least a portion of the central girder section in the vertical direction is divided by multiple intra-girder partition walls into a total of five rooms, consisting of a central room and four surrounding rooms. That is, within the central girder section, the multiple intra-girder partition walls are a core cylindrical wall surrounding the central room and protruding walls that protrude from the core cylindrical wall in all directions and connect to the outer cylindrical wall. As a result, the pallet of the present disclosure is roughly structured as if a core cylindrical wall had been added to the center of the central girder section of a conventional pallet, increasing the strength of the central girder section compared to conventional pallets. Furthermore, the pallet of Feature 1 reduces the increase in the number of intra-girder partition walls compared to a conventional pallet simply adding more intra-girder partition walls to divide it into two or more rooms in three or more rows. In other words, the pallet of Feature 1 makes it possible to increase the strength of the central girder section while minimizing the increase in weight. In addition, the multiple intra-girder partition walls are arranged so that the four peripheral rooms are rotationally symmetrical around the central room, and multiple inter-girder ribs extending from the multiple intra-girder partition walls to the four outer sides of the outer cylindrical wall bridge between the girders, so that bending stress caused by loads received by forks or cargo on the pallet is distributed throughout the pallet. Furthermore, the outer surfaces of the end portions of the multiple intra-girder partition walls, which form part of the upper or lower surface of the entire pallet, are flush with the outer surfaces of the multiple inter-girder ribs, so that the load received by the upper or lower surface of the pallet from the cargo or floor can be supported by the inter-girder ribs and intra-girder partition walls. The central room described above may be polygonal, such as rectangular or octagonal, or may be circular or elliptical.

[0043] [Feature 2] A pallet (10A to 10C) according to Feature 1, comprising a plurality of inter-girder beams (62, 82) bridging the central girder (70) and the four side girder portions (71, 72), each having a groove-shaped cross section and a pair of groove side walls (62B) and a groove bottom wall (62A, 82A) connecting the pair of groove side walls (62B) and having an outer surface flush with the outer surfaces of the end portions, one groove side wall (62B, 82B) of the plurality of inter-girder beams (62, 82) being one of the plurality of inter-girder ribs (62B, 82B) extending from the plurality of intra-girder partition walls (20).

[0044] The inter-girder ribs that are continuous with the intra-girder partition walls may be the groove side walls of multiple inter-girder beams with grooved cross sections that are bridged between the girder sections, as in the pallet of Feature 2, or they may be provided as part of inter-girder beams with L-shaped or T-shaped cross sections, or they may be simply strip-shaped plates that are individually spanned between the girder sections.

[0045] [Feature 3] The pallet (10A, 10B) described in Feature 1 is configured such that the plurality of intra-girder partition walls (20) are arranged on portions of four imaginary partition lines that divide the horizontal cross-sectional shape of at least a portion of the central girder section (70) into a total of nine areas of three rows and three columns, and are arranged to divide the central section (21R) into one central area and four peripheral sections (22R) corresponding to two areas around it.

[0046] According to the structure of Feature 3, the partition walls within the multiple girders have a simple structure, which reduces the cost of the resin molding molds used to form the pallets.

[0047] [Feature 4] The pallet (10A, 10B) according to feature 3 comprises a plurality of reinforcing walls (25) provided above and / or below the four surrounding rooms (22R), extended from the intra-girder partition wall (20), positioned on the four imaginary compartment lines, and connected to the outer cylindrical wall (70S); a plurality of inter-girder ribs (62B, 82B) provided on the plurality of reinforcing walls (25), having outer surfaces flush with the outer surfaces of the end portions of the intra-girder partition wall (20); and a plurality of inter-girder ribs (62B, 82B) extending from the plurality of reinforcing walls (25) to the four sides outside the central girder portion (70), bridging between the central girder portion (70) and the girders (71, 72) on each of the four sides, and having outer surfaces flush with the outer surfaces of the end portions of the intra-girder partition wall (20).

[0048] [Feature 5] The pallet (10A, 10B) described in Feature 4 is such that the reinforcing walls (25) are provided at both upper and lower ends of the outer tube wall (70S), and the reinforcing walls (25) and the four intra-girder partition walls (20) divide the upper and lower ends of the central girder (70) into nine rooms, respectively.

[0049] In the pallets with features 4 and 5, multiple reinforcing walls are concentrated at the vertical ends of the beams, which are most susceptible to deformation, allowing for effective reinforcement.

[0050] [Feature 6] In a pallet (10A-10C) having girder sections (70-73) with a structure having inner walls (70W-73W) within outer cylindrical walls (70S-73S) at a total of nine locations consisting of the center, the four corners, and the intermediate portions of each side of the outer edge, and into which forks can be inserted from two orthogonal directions (H1, H2), a core cylindrical wall (23) is included in the inner wall (70W) of the central girder section (70), is arranged in the center of the outer cylindrical wall (70S) and is at the same height as the outer cylindrical wall (70S), and is included in the inner wall (70W) of the central girder section (70), and is positioned at the same height as the outer cylindrical wall (70S) when viewed from above. A pallet (10A to 10C) comprising: a plurality of protruding walls (24) that protrude clockwise or counterclockwise from four points of a cylindrical wall (23), intersect with the outer cylindrical wall (70S), and are at the same height as the outer cylindrical wall (70S); and a plurality of inter-girder ribs (62B, 82B) that extend from the plurality of protruding walls (24) to the four sides outside the outer cylindrical wall (70S), bridge between the central girder (70) and the girder portions (71, 72) on each side, and have upper or lower surfaces that are flush with the upper or lower surfaces of the plurality of protruding walls (24).

[0051] In the pallet of Feature 6, the central girder is divided into five compartments by a so-called full-height core cylindrical wall that is the same height as the outer cylindrical wall and multiple full-height protruding walls that protrude from the core cylindrical wall at four locations. As a result, the pallet of Feature 6 is roughly structured as a conventional pallet with a core cylindrical wall added to the center of the central girder, resulting in a stronger central girder. Furthermore, the pallet of Feature 6 reduces the number of internal girder partition walls compared to a conventional pallet simply divided into two rows and three columns of compartments by adding internal girder partition walls. In other words, the pallet of Feature 6 increases the strength of the central girder while minimizing the weight increase. Furthermore, the multiple internal girder partition walls are arranged so that the four surrounding compartments are rotationally symmetrical around the central compartment. Multiple inter-girder ribs extending from the multiple internal girder partition walls to the four outer sides of the outer cylindrical wall bridge the girders. This allows the bending stress caused by loads from forks and cargo to be distributed throughout the pallet. Furthermore, since the multiple protruding walls and the multiple inter-girder ribs have upper or lower surfaces that are flush with each other, the load that the upper or lower surface of the pallet receives from the cargo or floor can be supported by the inter-girder ribs and intra-girder partition walls.

[0052] Although the present specification and drawings disclose specific examples of the technology included in the scope of the claims, the technology described in the claims is not limited to these specific examples, but also includes various modifications and variations of the specific examples, and also includes parts of the specific examples taken out alone. [Explanation of symbols]

[0053] 10A~10C Palette 20 Girder internal partition wall 21R Central Room 22R Surrounding Room 23,23C Core wall 24 Overhanging Wall 25 Reinforced Wall 62,82 Girder beam 62A,82A Groove bottom wall 62B, 82B groove side wall (inter-girder rib) 70~73 digit part 70S~73S outer cylinder wall 70W~73W inner wall

Claims

1. A pallet that has a girder structure with an inner wall inside an outer cylindrical wall at a total of nine locations consisting of the center, four corners, and the middle parts of each outer edge, and that can be inserted forks from two orthogonal directions. a plurality of inner girder partition walls that are included in the inner wall of the central girder and that divide at least a portion of the planar cross section of the central girder in the up-down direction into a central room located at the center and four peripheral rooms that are arranged rotationally symmetrically around the central room and extend from one end of each side of the outer cylindrical wall to a position near the other end; An outer end surface provided on the plurality of inner girder partition walls and forming part of the upper or lower surface of the entire pallet; a plurality of inter-girder ribs extending from the plurality of intra-girder partition walls to the four outer sides of the outer cylindrical wall, bridging between the central girder portion and the girders on the four sides thereof, and having outer surfaces flush with the outer surfaces of the end portions of the intra-girder partition walls; A pallet comprising:

2. a plurality of inter-girder beams bridged between the central girder and the four side girders, each having a groove-shaped cross section and including a pair of groove side walls and a groove bottom wall connecting the pair of groove side walls and having an outer surface flush with the outer end surfaces; 2. The pallet according to claim 1, wherein one groove side wall of the plurality of inter-girder beams is the plurality of inter-girder ribs extending from the plurality of intra-girder partition walls.

3. The pallet described in claim 1, wherein the multiple intra-girder partition walls are arranged on portions of four imaginary partition lines that divide the horizontal cross-sectional shape of at least a portion of the central girder section into a total of nine areas, three rows and three columns, and are arranged to divide the central room, which corresponds to one central area, and four peripheral rooms, which correspond to two surrounding areas.

4. a plurality of reinforcing walls provided above and / or below the four surrounding rooms, extending from the inner girder partition wall, disposed on the four imaginary compartment lines, and connected to the outer cylinder wall; An outer surface provided on the plurality of reinforcing walls and flush with the outer surface of the end of the inner girder partition wall; A pallet as described in claim 3, further comprising a plurality of inter-girder ribs extending from the plurality of reinforcing walls to the four sides of the central girder, bridging between the central girder and the girders on each side, and having outer surfaces flush with the outer surfaces of the ends of the intra-girder partition walls.

5. A pallet as described in claim 4, wherein the reinforcing walls are provided at both the upper and lower ends of the outer tube wall, and the upper and lower ends of the central girder are each divided into nine rooms by the reinforcing walls and the four intra-girder partition walls.

6. A pallet that has a girder structure with an inner wall inside an outer cylindrical wall at a total of nine locations consisting of the center, four corners, and the middle parts of each outer edge, and that can be inserted forks from two orthogonal directions. a core wall included in the inner wall of the central beam, positioned at a center within the outer casing wall, and at the same height as the outer casing wall; a plurality of protruding walls included in the inner wall of the central beam portion, protruding clockwise or counterclockwise from four positions of the core cylindrical wall when viewed from above, intersecting with the outer cylindrical wall, and having the same height as the outer cylindrical wall; a plurality of inter-girder ribs extending from the plurality of overhanging walls to the four outer sides of the outer cylindrical wall, bridging between the central girder and the girder on each of the four sides, and having upper or lower surfaces flush with upper or lower surfaces of the plurality of overhanging walls; A pallet comprising:

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