Pallet

Abstract

To provide a technique capable of increasing the strength of a pallet having a fork insertion hole whose entire underside is open compared to conventional techniques.SOLUTION: A pallet 10A is equipped with a square groove-shaped first-direction continuous beam 11 that penetrates a central girder portion 70 to connect between a pair of first intermediate girder portions 71, and a band-shaped second-direction continuous beam 12 that penetrates the central girder portion 70 to connect between a pair of second intermediate girder portions 72, so that the transmission of the load caused by the cargo on the pallet 10A is less likely to be interrupted by the central girder portion 70. In other words, the square groove-shaped first-direction continuous beam 11, the band-shaped second-direction continuous beam 12, and the wall portions connected to them distribute the load caused by the cargo on a deck surface 90 over a wide area of the pallet 10A, making it possible to increase the strength of the pallet 10A that has a first fork insertion hole 91 whose entire underside is open compared to conventional pallets.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a pallet that has girders at a total of nine locations: the center, four corners, and midpoints of each outer edge of a rectangular deck surface on which cargo is placed. [Background technology]

[0002] Known examples of the above-mentioned pallets include a pair of first fork insertion holes that penetrate between the girders in a first direction and a pair of second fork insertion holes that penetrate between the girders in a second direction. Among such pallets, there are those in which a lower inter-girder connecting portion is provided in each of the first and second fork insertion holes (a total of four), and those in which only two fork insertion holes are provided with lower inter-girder connecting portions and the remaining two fork insertion holes are not provided with lower inter-girder connecting portions, leaving the entire underside open (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2000-255570 A (Figs. 3 and 5) Summary of the Invention [Problem to be solved by the invention]

[0004] However, conventional pallets with fork insertion holes that are open on the entire underside as described above can suffer from a lack of strength. Therefore, this application provides a technology that can increase the strength of pallets with fork insertion holes that are open on the entire underside compared to conventional pallets. [Means for solving the problem]

[0005] One aspect of the invention of the present disclosure is a pallet that has multiple girders with a structure having an inner wall within a cylindrical wall at a total of nine locations, including the center, four corners, and midpoints of each outer edge of a rectangular deck surface on which cargo is placed, and has a pair of first fork insertion holes that penetrate between the girders in a first direction and a pair of second fork insertion holes that penetrate between the girders in a second direction perpendicular to the first direction, and multiple lower inter-girder connection portions that connect the lower ends of the girders at both ends and the middle of each of the second fork insertion holes, while the entire lower surface of each of the first fork insertion holes is open, and that has an upper surface that penetrates horizontally above the central girder and is included in part of the deck surface, connecting the upper ends of a pair of first intermediate girders that are girders located on both sides of the central girder in the first direction, or connecting the upper ends of a pair of second intermediate girders that are girders located on both sides of the central girder in the second direction. [Effects of the Invention]

[0006] In one embodiment of the pallet disclosed herein, a pair of second fork insertion holes are provided with multiple lower inter-girder connecting portions, while the entire underside of a pair of first fork insertion holes is open. The pallet also includes a top long beam connecting a pair of girders located on both sides of a central girder in the first or second direction, making it difficult for the central girder to interrupt the transmission of load from cargo on the pallet. In other words, the structure of one embodiment of the present disclosure distributes the load of cargo on the deck surface over a wide area of the pallet by the top long beam and the wall portions connected to it, making it possible to increase the strength of pallets with fork insertion holes whose entire undersides are open compared to conventional pallets. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view of a pallet according to one embodiment of the present disclosure. [Figure 2] Figure 2 is a perspective view of the pallet seen from diagonally below. [Figure 3] FIG. 3 is a partially enlarged cross-sectional side view of the AA section in FIG. 1. [Figure 4] FIG. 4 is a partially enlarged cross-sectional side view of the B-B cross section in FIG. [Figure 5] Figure 5 is a perspective view of the central girder from diagonally above. [Figure 6] Figure 6 is a perspective view of the central girder from diagonally below. [Figure 7] Figure 7 shows a plan view of the central girder from above. [Figure 8] Figure 8 shows the cross section of the central girder as seen from below. [Figure 9] Figure 9 shows a plan view of the first intermediate girder section from above. [Figure 10] Figure 10 is a cross-sectional view of the first intermediate girder seen from below. DETAILED DESCRIPTION OF THE INVENTION

[0008] A pallet 10A according to one embodiment of the present disclosure will be described with reference to Figures 1 to 10. As shown in Figure 1, the pallet 10A of this embodiment has girders at nine locations on a rectangular deck surface 90 on which cargo is placed, including the center, 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 girders in a first direction H1 and a pair of second fork insertion holes 92 that penetrate between the girders in a second direction H2 that is perpendicular to the first direction H1. As shown in Figure 2, each second fork insertion hole 92 has a plurality of lower inter-girder connection portions 80, 81 at both ends and in the middle that connect the lower ends of the girders, while the entire lower surface of each first fork insertion hole 91 is open.

[0009] 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 the "corner girder parts 73," the girder parts located on both sides of the central girder part 70 in the first 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 direction H2 will be referred to as the "second intermediate girder part 72." Furthermore, when describing multiple types of girder parts together, they will be abbreviated as "girders 70-73," or will be simply referred to as "girders" without the reference numerals.

[0010] As shown in FIG. 1, the girder portions 70-73 have inner walls 70W-73W within cylindrical walls 70S-73S. The cylindrical wall 70S of the central girder portion 70 is, for example, rectangular, while the girder portions 71S-73S of the other girder portions 71-73 are generally rectangular, with four flat side surfaces and four curved surfaces at the four corners. The presence or absence of curved surfaces, their positions, and the shape of the cylindrical walls are not limited to those described above. The side surfaces of the girder portions aligned vertically and horizontally are arranged so as to lie on the same plane.

[0011] Pallet 10A is, for example, molded entirely from resin. Alternatively, an upper and lower section may be molded separately from a vertical midpoint and then welded together. Pallet 10A as a whole has a crosspiece structure that can be removed vertically.

[0012] As shown in Figures 2 and 3, the lower inter-girder connection sections 80, 81 are provided with a plurality of inter-girder ribs 82 connecting the girders, a plurality of orthogonal ribs 83 perpendicular to the plurality of inter-girder ribs 82, and an upper wall 84 covering the plurality of inter-girder ribs 82 and the plurality of orthogonal ribs 83 from above, and have a structure in which both ends in the width direction are inclined.

[0013] As shown in Figure 1, the upper part of pallet 10A is composed of upper inter-girder connecting sections 93-96 that connect the girders in a linear manner, a luggage receiving section 97 surrounded by the upper inter-girder connecting sections 93-96, and the upper parts of girders 70-73.

[0014] The luggage receiving section 97 has a lattice structure with approximately square cells. As shown in FIG. 5 , each cell of the luggage receiving section 97 is provided with a ceiling wall 97A or a bottom wall 97B at the top or bottom so as to narrow the opening of the cell. In other words, each cell is provided with a ceiling wall 97A or a bottom wall 97B at either the top or bottom, and a square through-hole 97D is formed in the ceiling wall 97A or the bottom wall 97B for each cell. Cells having the ceiling wall 97A and cells having the bottom wall 97B are connected in the second direction H2 to form rows of ceiling wall cells having the ceiling wall 97A and rows of bottom wall cells having the bottom wall 97B. The rows of ceiling wall cells and the rows of bottom wall cells are alternately arranged in the first direction H1. As a result, as shown in FIG. 4, the cross section of the luggage receiving portion 97 taken along a cut surface parallel to the first direction H1 (cut surface BB in FIG. 1) has a rectangular wave shape.

[0015] As shown in Figure 1, the upper girder-to-girder connection sections 95, 96 adjacent to the luggage receiving section 97 in the first direction H1, i.e., the upper girder-to-girder connection section 95 between the central girder section 70 and the second intermediate girder section 72 and the upper girder-to-girder connection section 96 between the first intermediate girder section 71 and the corner girder section 73, have a lattice structure similar to the luggage receiving section 97, and as shown in Figure 4, have ceiling wall square rows having ceiling walls 95A, 96A and bottom wall square rows having bottom walls 95B, 96B arranged alternately in the first direction H1.

[0016] However, as shown in Figure 1, the shape of the squares of the upper inter-girder connecting sections 95, 96 is a rectangle that is longer in the second direction H2, and the through holes 95D, 96D (see Figure 5) formed in the ceiling walls 95A, 96A and the bottom walls 95B, 96B are also rectangular. In addition, a group of ribs included in the upper inter-girder connecting sections 95, 96 and the luggage receiving section 97, whose wall thickness direction faces the second direction H2 and extends in the first direction H1, are continuous over the entire first direction H1 of the pallet 10A (see Figure 1). Furthermore, in the upper inter-girder connecting section 96, the wall portion that forms the fork insertion opening of the first fork insertion hole 91 is inclined so as to be able to guide the forks (see Figure 4).

[0017] As shown in Figures 1 and 3, the upper inter-girder connecting section 93 between the second intermediate girder section 72 and the corner girder section 73 has a lattice structure without a ceiling wall or a bottom wall. In addition, the upper inter-girder connecting section 93 includes a group of ribs whose wall thickness direction faces the first direction H1 and extends in the second direction H2, and these ribs are continuous with a similar group of ribs in the luggage receiving section 97. Furthermore, the wall portion of the upper inter-girder connecting section 93 that forms the fork insertion opening of the second fork insertion hole 92 is inclined so as to be able to guide the forks (see Figure 3).

[0018] As shown in Figures 1 and 3, the upper inter-girder connection section 94 connecting the central girder section 70 and the pair of first intermediate girders 71 is composed only of a pair of square-channeled first-direction continuous beams 11 extending parallel to the first direction H1. As shown in Figure 5, the pair of square-channeled first-direction continuous beams 11 have a square-channeled structure with an open bottom. They include a top wall 11A that is horizontal and forms part of the deck surface 90, and a pair of side walls 11B bent downward at a right angle from both sides of the top wall 11A in the width direction. The pair of square-channeled first-direction continuous beams 11 are arranged at two positions that divide the side surface of the central girder section 70 facing the first direction H1 into thirds in the second direction H2. Furthermore, a plurality of reinforcing ribs 11C are provided inside the square-channeled first-direction continuous beam 11 so as to divide the square-channeled first-direction continuous beam 11 into multiple sections in the longitudinal direction. Furthermore, in the top wall 11A, a through hole 11D is formed for each of the small rooms separated by the reinforcing ribs 11C.

[0019] The upper inter-girder connecting portions 94, 95 extending in all directions from the central girder portion 70 include "top long beams" that are not divided by the central girder portion 70 and penetrate the central girder portion 70, extending continuously in the first direction H1 or the second direction H2. Specifically, as shown in FIG. 1 , the pair of square-channeled first-direction continuous beams 11 included in the upper inter-girder connecting portion 94 correspond to the above-mentioned "top long beams," penetrate the central girder portion 70 in the first direction H1, extend continuously between the pair of first intermediate girders 71, and have their ends located inside the first intermediate girder portion 71, so that they are continuous both inside and outside the first intermediate girder portion 71.

[0020] In addition, a pair of ribs 12 (see Figure 5) included in the upper inter-girder connecting section 95 and having a wall section with a rectangular wave-shaped cross section, with the wall thickness direction facing the first direction H1, also correspond to the above-mentioned "upper surface long beams", and extend continuously between the pair of second intermediate girders 72, penetrating the central girder 70 in the second direction H2, and as shown in Figure 1, the ends of these ribs 12 are located inside the second intermediate girder 72, and are continuous with the inside and outside of the second intermediate girder 72. Hereinafter, the above-mentioned pair of ribs 12 will be referred to as "a pair of strip-shaped second-direction continuous beams 12".

[0021] The internal structure of the central girder 70 is as follows. As shown in Figures 7 and 8, the interior of the central girder 70 is divided into, for example, nine rooms 70A to 70D. At the top of the central girder 70, as shown in Figure 8, a pair of side walls 11B on the far side of the total four side walls 11B of a pair of square-channel-shaped first-direction continuous beams 11 and a pair of strip-shaped second-direction continuous beams 12 intersect with each other to divide the interior of the central girder 70 into nine rooms 70A to 70D. Note that the side walls 11B and the strip-shaped second-direction continuous beams 12 also serve as inner walls 70W of the central girder 70 within the central girder 70.

[0022] 7, the lower part of the central girder 70 is also divided into nine rooms 70A to 70D by the inner walls 70W of the central girder 70, just as in the upper part. The multiple inter-girder ribs 82 in the middle of the width direction of the lower inter-girder connecting part 81 are continuous with the inner walls 70W that divide the lower part of the central girder 70 into the multiple rooms 70A to 70D. In other words, the multiple inter-girder ribs 82 of the lower inter-girder connecting part 81 form the "corner continuous walls" of Features 4 and 6 described below.

[0023] 5, the rooms 70A located at the four corners (hereinafter referred to as "corner rooms 70A") of the nine rooms 70A to 70D in the central girder 70 have an open top. In addition, the rooms 70C (hereinafter referred to as "second intermediate rooms 70C") and the central room 70D (hereinafter referred to as "central room 70D") sandwiched between the corner rooms 70A in the second direction H2 have their sides in the second direction H2 covered by upper walls 11A of a pair of square-channel-shaped first-direction continuous beams 11, and the central portions in the second direction H2 are open. Furthermore, the room 70B (hereinafter referred to as the "first intermediate room 70B" as appropriate) sandwiched between the corner rooms 70A in the first direction H1 has an upper wall 70B1 covering the entire upper surface, and this upper wall 70B1 is connected to a pair of strip-shaped second-direction continuous beams 12 and one side wall 11B and cylindrical wall 70S of the square groove-shaped first-direction continuous beam 11, and is also continuous with the upper wall 11A of one of the square groove-shaped first-direction continuous beams 11.

[0024] 6 and 7, the lower surface of the corner room 70A is closed by a bottom wall 70A2, and the entire bottom surface of the first intermediate room 70B is open. Furthermore, in the central portion of the second intermediate room 70C and the central room 70D in the second direction H2, a square channel beam 70Z having a structure in which the square channel-shaped first-direction continuous beam 11 is turned upside down is provided, and a bottom wall 70Y of the square channel beam 70Z closes a portion of the bottom surface of the second intermediate room 70C and the central room 70D. Furthermore, the side wall of the square channel beam 70Z is continuous in the first direction H1 with the lower inter-girder connecting portion 81 (inter-girder rib 82) located in the center in the second direction H2.

[0025] The internal structure of the first intermediate girder section 71 is as follows. As shown in FIG. 10, a square channel beam 71Z1 having a square channel structure similar to the square channel first-direction continuous beam 11 is provided at the upper part of the first intermediate girder section 71, extending in the second direction H2 midway in the first direction H1. A pair of square channel first-direction continuous beams 11 are perpendicular to the square channel beam 71Z1. Furthermore, the pair of side walls 11B on the far side of the total four side walls 11B of each pair of square channel first-direction continuous beams 11 divide the first intermediate girder section 71, on the central girder section 70 side of the square channel beam 71Z1, into two corner rooms 71A and a middle room 71B between them.

[0026] Each corner room 71A is divided into three regions in the first direction H1 by vertical ribs 71V protruding from the cylindrical wall 71S. Two regions on the upper surface of each corner room 71A facing the central beam 70 are open on the top and covered on the bottom by a bottom wall 71A2 as shown in Fig. 9, while the remaining region is covered on the top by a top wall 71A1 as shown in Fig. 10 and is open on the bottom as shown in Fig. 9. The nine rooms 70A to 70D of the central beam 70 may also be divided into multiple regions in the first direction H1 or the second direction H2 by vertical ribs protruding from the cylindrical wall 70S.

[0027] 10, the upper surface of the intermediate room 71B is covered on both sides in the second direction H2 by upper walls 11A of a pair of square grooved first-direction continuous beams 11. In addition, a square grooved beam 71Z2 extending in the first direction H1 with a structure similar to that of the square grooved first-direction continuous beam 11 is provided at the bottom of the intermediate room 71B, and the center of the intermediate room 71B in the second direction H2 is covered by a bottom wall 71Y of the square grooved beam 71Z2.

[0028] Furthermore, at the lower part of the first intermediate girder part 71, the multiple inter-girder ribs 82 of the lower inter-girder connecting part 81 are continuous in the first direction H1 with the inner wall 71W and cylindrical wall 71S that separate the lower parts of the two corner rooms 71A. Furthermore, the side walls of the square channel beam 71Z2 are continuous in the first direction H1 with the lower inter-girder connecting part 81 (inter-girder ribs 82) located in the center in the second direction H2. The first intermediate girder part 71 is partitioned at least at the upper and lower parts by the inner walls 71W into multiple rooms, including the corner rooms 71A and the intermediate room 71B.

[0029] As shown in Fig. 1, a square channel beam 72Z having a square channel structure similar to that of the first intermediate girder 71 is provided at the upper part of the second intermediate girder 72, extending in the first direction H1, and a square channel beam 73Z having a square channel structure is provided at the upper part of the corner girder 73 so that its planar shape is L-shaped. The square channel beam 72Z of the second intermediate girder 72 is located on an extension of one side of the L of the square channel beam 73Z of the corner girder 73, and the square channel beam 71Z1 of the first intermediate girder 71 is located on an extension of the other side. Furthermore, a portion of the ribs included in the upper inter-girder connection portion 93 and extending in the first direction H1 are continuous with a pair of side walls included in the square channel beam 72Z of the second intermediate girder portion 72 and a pair of side walls included on the other side of the square channel beam 73Z of the corner girder portion 73, and a portion of the ribs included in the upper inter-girder connection portion 96 and extending in the second direction H2 are continuous with a pair of side walls included in the square channel beam 71Z1 of the first intermediate girder portion 71 and a pair of side walls included on one side of the square channel beam 73Z of the corner girder portion 73. Furthermore, the ceiling wall 96A included in the upper inter-girder connection portion 96 is continuous with the top wall 71A1 that covers part of the top surface of the corner room 71A of the first intermediate girder portion 71, and is the "inter-girder top wall" of Feature 8 below.

[0030] This completes the description of the structure of the pallet 10A of this embodiment. Next, the effects of this pallet 10A will be described. As shown in FIG. 1 , the pallet 10A of this embodiment includes a square-channeled first-direction continuous beam 11 that penetrates the central girder 70 to connect a pair of first intermediate girder portions 71, and a band-shaped second-direction continuous beam 12 that penetrates the central girder 70 to connect a pair of second intermediate girder portions 72. This makes it difficult for the central girder 70 to interrupt the transmission of load from cargo on the pallet 10A. That is, according to the structure of this embodiment, the square-channeled first-direction continuous beam 11, the band-shaped second-direction continuous beam 12, and the walls connected thereto distribute the load from cargo on the deck surface 90 over a wide area of the pallet 10A. This makes it possible to increase the strength of the pallet 10A, which has a first fork insertion hole 91 whose entire underside is open, compared to conventional pallets.

[0031] 5, the inner wall 70W separating the corner room 70A from the other rooms at the top of the central girder 70 is configured by the side wall 11B of the square-channel-shaped first-direction continuous beam 11 and the band-plate-shaped second-direction continuous beam 12, thereby increasing the unity between the square-channel-shaped first-direction continuous beam 11 and the band-plate-shaped second-direction continuous beam 12 and the central girder 70. Also, while the entire top surface of each corner room 70A is open, as shown in FIG. 6, a bottom wall 70A2 is attached to the lower end of the corner room 70A, and the lower inter-girder connecting portion 81 includes a plurality of inter-girder ribs 82 (corresponding to the "corner continuous wall" in Features 4 and 6 below) that are continuous in the first direction H1 between the cylindrical wall 70S and the inner wall 70W at the bottom of each corner room 70A of the central girder 70, further increasing the unity between the central girder 70 and the surrounding walls. In addition, the central girder portion 70 is provided with a pair of first intermediate rooms 70B sandwiched between a pair of corner rooms 70A in the first direction H1, and a pair of second intermediate rooms 70C sandwiched between a pair of corner rooms 70A in the second direction H2, and while the entire bottom surface of each first intermediate room 70B is open, as shown in Figure 5, a top wall 70B1 is attached to the top surface, and the side walls and cylindrical wall 70S of the pair of strip-shaped second-direction continuous beams 12 and the square-groove-shaped first-direction continuous beam 11 are connected to this top wall 70B1, thereby further increasing the unity between the square-groove-shaped first-direction continuous beams 11 and strip-shaped second-direction continuous beams 12 and the central girder portion 70. This allows the load to be distributed throughout the entire pallet 10A, thereby increasing the strength of the pallet 10A.

[0032] 9 and 10, each first intermediate girder 71 also has corner rooms 71A at two corners near the central girder 70, and the inner walls 71W constituting the lower parts of these two corner rooms 71A have a structure in which the inter-girder ribs 82 (corresponding to the "corner continuous wall" in Features 4 and 6 below) of the lower inter-girder connecting part 81 are continuous in the first direction H1, thereby enhancing the unity between the first intermediate girder 71 and the lower inter-girder connecting part 81 and improving strength. In addition, the square groove-shaped first-direction continuous beam 11 and the cylindrical wall 72S of the first intermediate girder 71 are connected to the upper surface wall 71A1 covering part of the upper surface of the two corner rooms 71A of the first intermediate girder 71, thereby enhancing the unity between the first intermediate girder 71 and the strip-shaped first-direction continuous beam 11. Furthermore, the ceiling wall 96A of the upper inter-girder connecting portion 96 extends in the second direction H2 to connect between the first intermediate girder portion 71 and the corner girder portion 73, and forms an "inter-girder upper wall" that is continuous with the upper wall 71A1 of the corner room 71A of the first intermediate girder portion 71, thereby improving the integrity of the first intermediate girder portion 71 and the corner girder portion 73. These also serve to distribute the load across the entire pallet 10A, increasing the strength of the pallet 10A.

[0033] [Other embodiments] In the above embodiment, the "top surface long beam" includes both a top surface long beam (specifically, a band-shaped second-direction continuous beam 12) connecting a pair of first intermediate girder portions 71 and a top surface long beam (12) connecting a pair of second intermediate girder portions 72, but it may include only one of them. Both the top surface long beam extending in the first direction H1 and the top surface long beam extending in the second direction H2 may have a square groove structure such as the square groove-shaped first-direction continuous beam 11, or may have a band structure such as the band-shaped second-direction continuous beam 12.

[0034] In the above embodiment, two square groove-shaped first direction continuous beams 11 and two strip-shaped second direction continuous beams 12 were provided, but the number of each is not limited, and may be, for example, one of each, or three or more.

[0035] In the above embodiment, the interior of the central girder 70 is divided into nine rooms, 70A to 70D, but this is not limited thereto and the interior may be divided into eight or fewer rooms, or ten or more rooms. Furthermore, the number of rooms divided inside the other girder parts 71 to 73 other than the central girder 70 is not particularly limited. Furthermore, the inner walls 70W to 73W of the cylindrical parts 70 to 73 may be provided at least at the upper and lower parts in the height direction of the pallet 10A, or may be provided throughout the entire height direction.

[0036] In the above-described embodiment, each wall such as the upper walls 70B1 and 71A2, the lower walls 70A2 and 71A2, and the ceiling wall 96A may or may not have a through hole.

[0037] <Additional Notes> The following describes the features extracted from the above-described embodiments, while indicating their effects, etc., as necessary. Note that, for ease of understanding, the following will appropriately indicate corresponding configurations in the above-described embodiments in parentheses, etc. However, these features are not limited to the specific configurations indicated in parentheses, etc.

[0038] [Feature 1] The deck is provided with a plurality of girders (70-73) having inner walls (70W-73W) within cylindrical walls (70S-73S) at nine locations in total, including the center, four corners, and intermediate positions of each side of the outer edge of a rectangular deck surface (90) on which cargo is placed. The deck is also provided with a pair of first fork insertion holes (91) penetrating between the girders (70-73) in a first direction (H1) and a pair of second fork insertion holes (92) penetrating between the girders (70-73) in a second direction (H2) perpendicular to the first direction (H1), and a plurality of lower girders (70-73) connecting the lower ends of the girders (70-73) are provided at both ends and intermediate positions of each of the second fork insertion holes (92). A pallet (10A) having connecting portions (80, 81) while the entire underside of each of the first fork insertion holes (91) is open, and having upper surface long beams (11, 12) that horizontally penetrate the upper part of the central girder (70) and have an upper surface that is included in part of the deck surface (90), connecting the upper ends of a pair of first intermediate girder portions (71) that are girder portions located on both sides of the central girder (70) in the first direction (H1), or connecting the upper ends of a pair of second intermediate girder portions (72) that are girder portions located on both sides of the central girder (70) in the second direction (H2).

[0039] [Feature 2] A pallet (10A) according to Feature 1, wherein the upper surface long beams (11, 12) include a plurality of square groove-shaped first direction continuous beams (11) that form a square groove structure with an open bottom and extend continuously between the pair of first intermediate girder sections (71).

[0040] [Feature 3] A pallet (10A) according to Feature 2, wherein the upper surface long beams (11, 12) include a plurality of strip-shaped second direction continuous beams (12) that are strip-shaped with their thickness direction facing the first direction (H1) and extend continuously between the pair of second intermediate girder portions (72).

[0041] [Feature 4] At the four corners of the central beam (70), four corner rooms (70A) are provided, the upper and lower parts of which are surrounded by the cylindrical wall (70S) and the inner wall (70W) from all sides. Each corner room (70A) of the central beam (70) has an open upper surface, and a lower wall (70A2) is attached to the lower end. The upper part of each corner room (70A) of the central beam (70) is enclosed by the inner wall (70W) The pallet (10A) according to feature 3 is configured by the side walls (11B) of the square groove-shaped first-direction continuous beams (11) and the band-shaped second-direction continuous beams (12), and the lower inter-girder connection portion (81) includes a plurality of corner continuous walls (82) that are continuous in the first direction (H1) with the cylindrical wall (70S) and the inner wall (70W) at the lower part of each corner room (70A) of the central girder portion (70).

[0042] [Feature 5] The central girder (70) is provided with a pair of second intermediate rooms (70C) sandwiched between pairs of the corner rooms (70A) in the second direction (H2) and aligned in the first direction (H1), and a pair of first intermediate rooms (70B) sandwiched between pairs of the corner rooms (70A) in the first direction (H1) and aligned in the second direction (H2). Each of the first intermediate rooms (70B) of the central girder (70) has an open bottom surface entirely, while an upper surface is provided with an upper wall (70B1), and a pair of the strip-shaped second-direction continuous beams (12), the side walls (11B) of the square groove-shaped first-direction continuous beams (11), and the cylindrical wall (70S) are connected to the upper wall (70B1).

[0043] [Feature 6] A pallet (10A) according to feature 4, wherein two corner rooms (71A) are provided at the two corners of each of the first intermediate girder sections (71) closest to the central girder section (70) and surrounded from at least the upper and lower four sides by the cylindrical wall (71S) and the inner wall (71W), and at least the area of the two corner rooms (71A) of each of the first intermediate girder sections (71) closest to the central girder section (70) is provided with a bottom wall (71A2) on the underside, while the top surface directly above the bottom wall (71A2) is open, and the multiple corner continuous walls (82) of the lower inter-girder section connecting section (81) are continuous with the cylindrical wall (71S) and the inner wall (71W) in the first direction (H1) at the lower part of each of the two corner rooms (71A) of each of the first intermediate girder sections (71).

[0044] [Feature 7] A pallet (10A) according to any one of claims 2 to 5, wherein a portion of the upper surface of the first intermediate girder portion (71) is closed by an upper wall (71A1), the square groove-shaped first-direction continuous beam (11) and the cylindrical wall (71S) are connected to the upper wall (71A1) of the first intermediate girder portion (71), and the pallet (10A) extends in the second direction (H2) to connect between the first intermediate girder portion (71) and a pair of corner girder portions (73) of the four corner girder portions (73), and is plate-shaped with the thickness direction in the vertical direction, and is provided with an inter-girder upper wall (96A) that is continuous with the upper wall (71A) of the first intermediate girder portion (71).

[0045] A pallet of Feature 1 is a pallet in which a pair of second fork insertion holes are provided with multiple lower inter-girder connection sections, while the entire underside of a pair of first fork insertion holes is open. The pallet of Feature 1 also has top long beams that connect a pair of girders located on both sides of the central girder in the first or second direction, making it difficult for the central girder to interrupt the transmission of load from cargo on the pallet. In other words, the structure of Feature 1 distributes the load from cargo on the deck surface over a wide area of the pallet by the top long beams and the wall sections connected to them, making it possible to increase the strength of pallets with first fork insertion holes whose entire undersides are open compared to conventional pallets.

[0046] Here, the above-mentioned upper surface long beam may be either an upper surface long beam connecting the upper ends of a pair of first intermediate girder sections, which are girder sections located on both sides of a central girder section in the first direction, or an upper surface long beam connecting the upper ends of a pair of second intermediate girder sections, which are girder sections located on both sides of a central girder section in the second direction, or it may be both.

[0047] The structure of the top long beams may be a square groove structure or a strip shape with the thickness direction facing horizontally. Furthermore, if the top long beams are provided with a plurality of square groove-shaped first-direction continuous beams that form a square groove structure with an open bottom and extend continuously between a pair of first intermediate girders as in Feature 2, the bending strength of the pallet in the first direction can be increased. Additionally, if the top long beams are provided with a plurality of strip-shaped second-direction continuous beams that extend continuously between a pair of second intermediate girders as in Feature 3, the bending strength of the pallet in both the first and second directions can be increased.

[0048] In addition to Feature 3, as in Feature 4, corner rooms are provided at the four corners of the central girder, and the upper inner walls of each corner room are composed of the side walls of the square-channel-shaped first-direction continuous beams and the band-plate-shaped second-direction continuous beams, thereby increasing the unity between the square-channel-shaped first-direction continuous beams and the band-plate-shaped second-direction continuous beams and the central girder. Furthermore, as in the pallet of Feature 4, each corner room has a structure in which the entire top surface is open while a bottom wall is attached to the lower end, and the lower inter-girder connection section includes multiple corner continuous walls that are continuous in the first direction with the cylindrical wall and inner wall at the bottom of each corner room of the central girder, further increasing the unity between the central girder and the surrounding walls. This allows the load to be distributed throughout the entire pallet, increasing its strength.

[0049] In addition to Feature 4, as in Feature 5, the central girder is provided with a pair of second intermediate rooms sandwiched between a pair of corner rooms in the second direction, and a pair of first intermediate rooms sandwiched between a pair of corner rooms in the first direction, and each first intermediate room has an open bottom surface and an upper surface with an upper wall attached, and the side walls and cylindrical walls of the pair of band-shaped second-direction continuous beams and the square groove-shaped first-direction continuous beams are connected to the upper wall, thereby further increasing the unity between the square groove-shaped first-direction continuous beams and band-shaped second-direction continuous beams and the central girder.

[0050] Furthermore, as in the pallet of Feature 6, if corner rooms are provided in the two corners of each first intermediate girder section that are closer to the central girder section, and multiple corner continuous walls of the lower inter-girder connecting section are configured to be continuous in the first direction with the walls that form the lower parts of those two corner rooms, the unity between the first intermediate girder section and the lower inter-girder connecting section will be enhanced, improving strength.In addition, as in Feature 7, by configuring the top wall that covers a part of the first intermediate girder section to be connected to the band-type first-direction continuous beam and the cylindrical wall of the first intermediate girder section, the unity between the first intermediate girder section and the band-type first-direction continuous beam will be enhanced, improving strength.

[0051] Furthermore, in Feature 7, by providing an inter-girder upper surface wall that extends in the second direction to connect the first intermediate girder portion and a pair of corner girder portions and is continuous with the upper surface wall of the corner room of the second intermediate girder portion, the integrity of the first intermediate girder portion and the corner girder portions is also improved.

[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 Pallet 11 Square channel type one-way continuous beam (top long beam) 11A Top wall 11B Side wall 12. Strip-type second-direction continuous beam (top long beam) 70 Central girder 70~73 digit part 70A Corner Room 70A2 Bottom wall 70B First Intermediate Room 70B1 Top wall 70C Second Intermediate Room 70S~73S Cylinder wall 70W~73W Inner wall 71 First intermediate girder 71A Corner Room 71A1 Top wall 71A2 Bottom wall 72 Second intermediate girder 73 Corner beam 80,81 Lower girder connection 82 Inter-girder rib (corner continuous wall) 90 Deck surface 91 First fork insertion hole 92 Second fork insertion hole 96A Ceiling wall (inter-girder top wall) H1 1st direction H2 2nd direction

Claims

1. The deck has a rectangular surface on which cargo is placed, and is provided with a plurality of girders having an inner wall within a cylindrical wall at nine locations, including the center, the four corners, and the middles of each of the outer edges. The deck has a pair of first fork insertion holes that penetrate between the girders in a first direction, and a pair of second fork insertion holes that penetrate between the girders in a second direction perpendicular to the first direction. In a pallet in which a plurality of lower inter-girder connecting portions that connect the lower ends of the girders are provided at both ends and the middle of each second fork insertion hole, while the entire lower surface of each first fork insertion hole is open, A pallet having a top long beam that horizontally penetrates the upper part of the central girder and has an upper surface that is included as part of the deck surface, and that connects the upper ends of a pair of first intermediate girder parts that are girder parts located on both sides of the central girder part in the first direction, or that connects the upper ends of a pair of second intermediate girder parts that are girder parts located on both sides of the central girder part in the second direction.

2. 2. The pallet according to claim 1, wherein the upper long beam includes a plurality of square groove-shaped first direction continuous beams that form a square groove structure with an open bottom and extend continuously between the pair of first intermediate beams.

3. A pallet as described in claim 2, wherein the upper surface long beam includes a plurality of strip-shaped second direction continuous beams which extend continuously between the pair of second intermediate girder portions and have a strip-like shape with their thickness direction facing the first direction.

4. Four corner rooms are provided at the four corners of the central girder, and at least the upper and lower parts of the rooms are surrounded by the cylindrical wall and the inner wall from all sides. Each corner room of the central beam has an open upper surface and a lower wall at the lower end. The inner walls of the upper portions of the corner rooms of the central girder portion are formed by the side walls of the square groove-shaped first-direction continuous beams and the band-shaped second-direction continuous beams, A pallet as described in claim 3, wherein the lower girder-to-girder connection section includes a plurality of corner continuous walls that are continuous in the first direction with the cylindrical wall and the inner wall at the lower part of each corner room of the central girder section.

5. The central girder portion is provided with a pair of second intermediate rooms sandwiched between pairs of the corner rooms in the second direction and aligned in the first direction, and a pair of first intermediate rooms sandwiched between pairs of the corner rooms in the first direction and aligned in the second direction, A pallet as described in claim 4, wherein each of the first intermediate rooms of the central girder section has an entirely open bottom surface and an upper surface with a top wall attached to it, and the side walls of a pair of the strip-shaped second-direction continuous beams and the square groove-shaped first-direction continuous beams and the cylindrical wall are connected to the top wall.

6. Two corner rooms are provided at two corners of each of the first intermediate girders near the central girders, and the upper and lower parts of the corner rooms are surrounded by the cylindrical wall and the inner wall from all sides, At least the area of the two corner rooms of each of the first intermediate girders on the side of the central girders has a bottom wall on the bottom surface, while the top surface directly above the bottom wall is open, A pallet as described in claim 4, wherein the multiple corner continuous walls of the lower girder-to-girder connecting section are continuous in the first direction with the cylindrical wall and the inner wall at each lower part of the two corner rooms of each of the first intermediate girder sections.

7. A portion of the upper surface of the first intermediate girder portion is closed by an upper surface wall, The square groove-shaped first direction continuous beam and the cylindrical wall are connected to the top wall of the first intermediate girder portion, A pallet described in any one of claims 2 to 5, which extends in the second direction to connect the first intermediate girder portion and a pair of corner girder portions among the four corner girder portions, is plate-shaped with the thickness direction in the up-down direction, and has an inter-girder upper wall that is continuous with the upper wall of the first intermediate girder portion.

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