JP2020203718A - Pallet - Google Patents

Abstract

To provide a pallet that does not bend easily so that it will be convex upward even when luggage is placed on it.SOLUTION: A pallet 1 includes an upper deck portion 2 formed in a rectangular shape in a plan view, a lower deck portion 3 formed in a rectangular shape in a plan view, a corner girder 41, an intermediate girder 42, and a central girder 43. The corner girder 41 connects each corner of the upper deck portion 2 and each corner of the lower deck portion 3, respectively. The intermediate girder 42 connects an intermediate portion of each side of the upper surface deck portion 2 and an intermediate portion of each side of the lower surface deck portion 3, respectively. A fork insertion port 10 is formed in the pallet 1 between the upper deck portion 2 and the lower deck portion 3 and between the corner girder 41 and the intermediate girder 42. In the portion of the upper deck portion 2 corresponding to the fork insertion port 10, the pallet 1 has a thin portion 6 thinner than a thickness of the portion serving as the thick portion 5 on the corner girder 41 side in the portion on the intermediate girder 42 side.SELECTED DRAWING: Figure 5

Description

The present invention relates to a pallet, and more specifically, includes an upper deck portion, a lower deck portion, a corner girder, an intermediate girder, and a central girder, and between the upper deck portion and the lower surface deck portion, and between the corner girder and the intermediate girder. With respect to a pallet in which a fork insertion slot is formed between.

Conventionally, a synthetic resin pallet in which a plurality of girders are arranged between a front surface portion and a back surface portion to connect the front surface portion and the back surface portion and a fork insertion port is formed between adjacent girders is known. (See, for example, Patent Document 1).

As shown in FIG. 13A, the fork insertion slot has a rectangular shape in a side view, and the surface portion located above the fork insertion slot has a predetermined uniform thickness.

The pallet on which the luggage 91 is loaded on the surface is transported in a state where the fork of the forklift is inserted into the fork insertion port and lifted up.

Japanese Patent No. 4564157

However, as shown in FIG. 13B, the pallet in which the fork is inserted into the fork insertion port and lifted up has the pallet bent, the load placed on the pallet cracks, and the load collapses. There was a risk of it occurring.

In addition, if the luggage placed on the pallet is cracked and protrudes from the outer dimensions of the pallet, when packing the luggage and pallet into a fixed space such as a truck or warehouse, the cracked luggage will be the first space. It may hit the luggage on the side and you may not be able to put it in the space. In this case, the pallet carried by the fork is placed on the floor, and the pallet is dragged or pushed into the space while being placed on the floor so that the pallet does not bend, which causes a problem that it takes time and effort. there were.

The present invention has been invented in view of the above-mentioned conventional problems, and an object of the present invention is to provide a pallet that does not easily bend so as to be convex upward even when a load is placed on it.

In order to solve the above problems, one form of the pallet according to the present invention includes an upper deck portion formed in a rectangular shape in a plan view, a lower deck portion formed in a rectangular shape in a plan view, a corner girder, and an intermediate girder. And a central girder. The corner girder connects each corner of the upper deck portion and each corner of the lower deck portion, respectively. The intermediate girder connects the intermediate portion of each side of the upper surface deck portion and the intermediate portion of each side of the lower surface deck portion, respectively. The central girder connects the central portion of the upper surface deck portion and the central portion of the lower surface deck portion, respectively. A fork insertion port is formed in the pallet between the upper surface deck portion and the lower surface deck portion, and between the corner girder and the intermediate girder. The pallet has a portion of the upper surface deck portion corresponding to the fork insertion port, the portion on the intermediate girder side, and a thin portion having a thickness thinner than the thickness of the portion to be the thick portion on the corner girder side.

The pallet of another form according to the present invention includes a top deck portion formed in a rectangular shape in a plan view, a corner girder, an intermediate girder, and a central girder. The corner girder projects downward from each corner of the upper deck portion. The intermediate girder projects downward from the intermediate portion of each side of the upper deck portion. The central girder projects downward from the central portion of the upper deck portion. A fork insertion port is formed in the pallet between the corner girder and the intermediate girder. The pallet has a portion of the upper surface deck portion corresponding to the fork insertion port, the portion on the intermediate girder side, and a thin portion having a thickness thinner than the thickness of the portion to be the thick portion on the corner girder side.

In order to solve the above problems, the pallet of yet another form according to the present invention has an upper deck portion formed in a rectangular shape in a plan view, a lower deck portion formed in a rectangular shape in a plan view, a corner girder, and an intermediate portion. It includes a girder and a central girder. The corner girder connects each corner of the upper deck portion and each corner of the lower deck portion, respectively. The intermediate girder connects the intermediate portion of each side of the upper surface deck portion and the intermediate portion of each side of the lower surface deck portion, respectively. The central girder connects the central portion of the upper surface deck portion and the central portion of the lower surface deck portion, respectively. A fork insertion port is formed in the pallet between the upper surface deck portion and the lower surface deck portion, and between the corner girder and the intermediate girder. The pallet has a low rigidity portion having a bending rigidity lower than the bending rigidity of the corner girder side portion in the intermediate girder side portion in the portion of the upper surface deck portion corresponding to the fork insertion port.

In the pallet according to the present invention, when a bending moment that lowers the intermediate girder side portion is applied to the thin wall portion or the low rigidity portion due to the load loaded on the intermediate girder side portion, the thin wall portion or the low rigidity portion is applied. It bends at the part and the part on the middle girder side becomes low and dents downward. When the vicinity of the middle girder side of the pallet is dented downward, a force that causes the load to tilt toward the center acts on the load, so that the load is less likely to crack.

FIG. 1 is a perspective view of a pallet according to the first embodiment. FIG. 2 is a plan view of the same pallet. FIG. 3 is a bottom view of the same pallet. FIG. 4 is a cross-sectional view of the same pallet cut at the center of the top and bottom when viewed from above. FIG. 5A is a side view of the same pallet. FIG. 5B is a partially enlarged side view of another example of the same pallet. FIG. 6 is a cross-sectional view of the same pallet cut at the center of the top and bottom when viewed from below. FIG. 7 is a side view of the pallet according to the second embodiment. FIG. 8 is a side view of the pallet according to the third embodiment. FIG. 9 is a side view of the pallet according to the fourth embodiment. FIG. 10 is a side view of the pallet according to the fifth embodiment. FIG. 11 is a side view of the pallet according to the sixth embodiment. FIG. 12 is a side view of the pallet according to the eighth embodiment. FIG. 13A is a side view of the pallet according to the conventional example in a non-bent state. FIG. 13B is a side view of the same pallet in a bent state.

The present invention relates to pallets. Hereinafter, the pallet according to the present invention will be described based on the embodiments shown in the accompanying drawings.

The pallet according to the first embodiment will be described with reference to FIGS. 1 to 5B. The strength of the pallet according to the first embodiment is Class B in the JISZ0602 test.

As shown in FIG. 1, the pallet 1 includes an upper deck portion 2, a lower deck portion 3, and a girder portion 4. The pallet 1 is integrally molded by injection molding of a synthetic resin. That is, the upper surface deck portion 2 and the girder portion 4 are integrally connected, and the lower surface deck portion 3 and the girder portion 4 are integrally connected. The pallet 1 in the first embodiment is a single-sided pallet 1 and is designed to be used in a state where the upper deck portion 2 is located on the upper side and the lower deck portion 3 is located on the lower side. That is, although the upper deck portion 2 and the lower deck portion 3 have substantially the same outer shape in a plan view, the overall shape, height, and the like are not formed to be the same. In the following description, the side where the upper deck portion 2 is located is referred to as the upper side, and the side where the lower surface deck portion 3 is located is referred to as the lower side.

The upper surface deck portion 2 is formed in a rectangular shape in a plan view as shown in FIG. 2, and the lower surface deck portion 3 is formed in a rectangular shape in a bottom view (plan view) as shown in FIG. As shown in FIGS. 1 to 3, both the upper deck portion 2 and the lower deck portion 3 have a square outer shape in a plan view and are formed to have the same shape and the same size so that the outer shells overlap in a plan view. Arranged at intervals in the vertical direction.

As shown in FIG. 2, the upper deck portion 2 has a girder upper portion 21, an upper rail portion 22, and an upper rail intersection portion 23. The girder upper portion 21 is located above the girder portion 4. The upper deck portion 2 has a corner girder upper portion 211, an intermediate girder upper portion 212, and a central girder upper portion 213 as the girder upper portion 21.

The upper corner girder 211 is located at each of the four corners of the upper deck portion 2 in a plan view. The upper corner girder 211 is formed by connecting ribs 24 along one side of the upper deck portion 2 which are rectangular (square) in a plan view to ribs 25 orthogonal to the ribs 24. The upper corner girder 211 is formed in a mesh shape having through openings that penetrate vertically. The upper corner girder 211 is located above the corner girder 41, which will be described later, and is integrally formed with the corner girder 41.

The upper part 212 of the intermediate girder is located in the middle of the four sides of the upper deck portion 2. The middle girder upper portion 212 is formed in a mesh shape having ribs and through holes similar to those of the corner girder upper portion 211. The upper part 212 of the intermediate girder is located above the intermediate girder 42, which will be described later, and is integrally formed with the intermediate girder 42.

The upper portion 213 of the central girder is located at the central portion of the upper deck portion 2. The central girder upper portion 213 is formed in a mesh shape having ribs and through holes similar to those of the corner girder upper portion 211. The central girder upper portion 213 is located above the central girder 43, which will be described later, and is integrally formed with the central girder 43.

The upper rail portion 22 is located between the two upper girders 21 and connects the two upper girders 21. The upper deck portion 2 has an end upper rail portion 221 and an inner upper rail portion 222 as the upper rail portion 22.

The upper end rail portion 221 is located between the upper corner girder 211 and the upper middle girder 212, and connects the upper corner girder 211 and the upper middle girder 212. A total of eight end upper rail portions 221 are provided, two on each of the four sides of the upper deck portion 2. The upper end rail portion 221 is formed in a mesh shape having ribs and through holes similar to those of the upper corner girder 211.

The inner upper rail portion 222 is located between the middle girder upper part 212 and the central girder upper part 213, and connects the middle girder upper part 212 and the central girder upper part 213. A total of four inner crosspieces 222 are provided radially from the upper part of the central girder at a pitch of 90 degrees. The inner upper rail portion 222 is formed in a mesh shape having ribs and through holes similar to those of the upper corner girder 211.

The upper rail portion 23 is located at a portion where four sides are surrounded by the upper rail portion 22, and is connected to the upper rail portion 22 respectively. A total of four upper crosspieces 23 are provided. The upper crosspiece portion 23 is formed in a mesh shape having ribs and through holes similar to those of the upper corner girder 211.

The upper surfaces of the girder upper portion 21, the upper rail portion 22, and the upper rail intersection portion 23 of the upper deck portion 2 are located on the same plane.

As shown in FIG. 3, the lower surface deck portion 3 has a girder lower portion 31 and a lower rail portion 32. The lower part 31 of the girder is located below the girder part 4. The lower deck portion 3 has a corner girder lower portion 311 as a girder lower portion 31, an intermediate girder lower portion 312, and a central girder lower portion 313.

The lower corner girder 311 is located at each of the four corners of the lower deck portion 3 in a plan view. The lower corner girder 311 is formed by connecting a rib 34 along one side of the lower surface deck portion 3 with a rib 35 orthogonal to the rib 34 in a plan view. The lower corner girder 311 is formed in a mesh shape having through openings that penetrate vertically. The lower corner girder 311 is located below the corner girder 41 and is integrally formed with the corner girder 41.

The lower portion 312 of the intermediate girder is located in the middle of the four sides of the lower deck portion 3. The lower part 312 of the intermediate girder is formed in a mesh shape having ribs and through holes similar to the lower part 311 of the corner girder. The lower portion 312 of the intermediate girder is located below the intermediate girder 42 and is integrally formed with the intermediate girder 42.

The lower center girder 313 is located at the center of the lower deck portion 3. The lower center girder 313 is formed in a mesh shape having ribs and through holes similar to the lower corner girder 311. The lower portion 313 of the central girder is located below the central girder 43 and is integrally formed with the central girder 43.

The lower rail portion 32 is located between the two lower girders 31 and connects the two lower girders 31. The lower surface deck portion 3 has an end lower rail portion 321 and an inner lower rail portion 322 as the lower rail portion 32.

The lower end rail portion 321 is located between the lower corner girder 311 and the lower middle girder 312, and connects the lower corner girder 311 and the lower middle girder 312. A total of eight end lower rail portions 321 are provided, two on each of the four sides of the lower deck portion 3. The lower end rail portion 321 is formed in a mesh shape having ribs and through holes similar to those of the lower corner girder 311.

The inner lower rail portion 322 is located between the lower middle girder 312 and the lower central girder 313, and connects the lower middle girder 312 and the lower central girder 313. A total of four inner lower rail portions 322 are provided radially from the lower center girder 313 at a pitch of 90 degrees. The inner lower rail portion 322 is formed in a mesh shape having ribs and through holes similar to those of the lower corner girder 311.

The lower surface deck portion 3 does not have a configuration corresponding to the upper crosspiece portion 23 of the upper surface deck portion 2. An opening 33 (see FIG. 4) penetrating vertically is formed in a portion of the lower surface deck portion 3 where the four sides are surrounded by the lower rail portion 32. A total of four openings 33 are provided between the crosspieces.

The lower surface of the girder 31 of the lower surface deck portion 3 and the lower surface of the lower rail portion 32 are located on the same plane.

As shown in FIG. 1, the girder portion 4 is located between the upper surface deck portion 2 and the lower surface deck portion 3, and connects the upper surface deck portion 2 and the lower surface deck portion 3. The pallet 1 has a corner girder 41, an intermediate girder 42, and a central girder 43 as the girder portion 4.

The corner girder 41 connects each corner of the upper deck portion 2 and each corner of the lower deck portion 3, respectively. Specifically, the upper corner girder 211 of the upper deck portion 2 and the lower corner girder 311 of the lower surface deck portion 3 located below the upper corner girder 211 are connected by the corner girder 41, respectively. As shown in FIG. 4, a total of four corner girders 41 are provided. The corner girder 41 has a tubular portion 44 extending in the vertical direction. The shape of the tubular portion 44 in the horizontal cross section is substantially square. Further, in the tubular portion 44 of the corner girder 41, a rib 45 along one side of the upper surface deck portion 2 and ribs connected orthogonally to the rib 45 are formed in the tubular portion 44 in a plan view.

The intermediate girder 42 connects the intermediate portion of each side of the upper surface deck portion 2 and the intermediate portion of each side of the lower surface deck portion 3, respectively. Specifically, the upper intermediate girder 212 of the upper deck portion 2 and the lower intermediate girder 312 of the lower deck 3 located below the upper intermediate girder 212 are connected by the intermediate girder 42. A total of four intermediate girders 42 are provided. The intermediate girder 42 has a tubular portion 44 extending in the vertical direction, similarly to the corner girder 41. The shape of the tubular portion 44 in the horizontal cross section is substantially square. Further, in the tubular portion 44 of the intermediate girder 42, ribs along one side of the upper surface deck portion 2 and ribs connected orthogonally to the ribs are formed in the tubular portion 44 in a plan view.

The central girder 43 connects the central portion of the upper surface deck portion 2 and the central portion of the lower surface deck portion 3, respectively. Specifically, the upper center girder 213 of the upper deck portion 2 and the lower center girder 313 of the lower surface deck portion 3 are connected by the central girder 43. The central girder 43 has a tubular portion 44 extending in the vertical direction, similarly to the corner girder 41 and the intermediate girder 42. The shape of the tubular portion 44 in the horizontal cross section is substantially square. Further, in the tubular portion 44 of the central girder 43, ribs along one side of the upper surface deck portion 2 and ribs connected orthogonally to the ribs are formed in the tubular portion 44 in a plan view.

When the lower portion 31 of the girder of the lower deck portion 3 and the lower surface of the lower rail portion 32 are placed on a horizontal plane, the upper surfaces of the girder upper portion 21, the upper rail portion 22, and the upper rail portion 23 of the upper deck portion 2 are horizontally identical. Located on a flat surface. That is, the thickness of the pallet 1 (that is, the vertical length between the upper surface and the lower surface) is formed to be constant.

As shown in FIG. 1, the pallet 1 has a fork insertion slot 10. The fork insertion port 10 is formed between the upper surface deck portion 2 and the lower surface deck portion 3 and between the corner girder 41 and the intermediate girder 42. Specifically, as shown in FIG. 5A, the fork insertion port 10 has the upper end rail portion 221 on the upper side, the lower end rail portion 321 on the lower side, and the corner girder 41 and the intermediate girder 42 on the side. It is the part surrounded by these. The fork insertion openings 10 correspond to each pair of the upper end rail portion 221 and the lower end rail portion 321, and two forks are provided on each of the four sides of the pallet 1, for a total of eight forks.

The fork insertion port 10 is open toward the side, and the fork 9 of the hand forklift (see the broken line in FIG. 5A) is inserted. The fork 9 is inserted from the fork insertion port 10 formed on one side of the pallet 1, and the tip of the fork 9 protrudes slightly from the fork insertion port 10 formed on the side facing one side of the pallet 1, but the fork 9 is not necessarily fork 9. The tip of the fork does not have to come out from the fork insertion port 10. The series of spaces in which the fork 9 can be inserted becomes the fork insertion space 11. That is, the fork insertion space 11 is between the upper end rail portion 221 and the lower end rail portion 321 (fork insertion port 10), between the upper rail portion 23 and the inter-bar opening 33, and between the inner upper rail portion 222 and the inside. By a series of spaces that reach in order between the lower rail portion 322, between the upper rail portion 23 and the cross rail opening 33, and between the end upper rail portion 221 and the end lower rail portion 321 (fork insertion port 10). It is composed. Two fork insertion spaces 11 are arranged side by side on one side of the pallet 1 and a side facing the pallet 1, and two fork insertion spaces 11 are arranged side by side on a side adjacent to one side of the pallet 1 and a side facing the side, for a total of four forks. It is provided so as to form a well shape in a plan view. The pallet 1 is a so-called four-sided pallet.

In the pallet 1, the fork 9 is inserted from the fork insertion port 10, and the upper deck portion 2 is supported by the fork 9. In the conventional pallet 1, when the upper deck portion 2 is supported by the fork 9, as shown in FIG. 13B, the upper deck portion 2 is bent so as to be convex upward, and the luggage 91 is released from the pallet 1. There was a risk of falling.

Therefore, the pallet 1 of the first embodiment has a thin-walled portion 6 as shown in FIG. 5A in order to prevent the upper surface deck portion 2 (pallet 1) from bending so as to be convex upward. The thin-walled portion 6 is formed in a portion of the upper surface deck portion 2 corresponding to the fork insertion port 10 (that is, the end upper rail portion 221) on the intermediate girder 42 side. In the end upper rail portion 221, the portion on the corner girder 41 side of the thin portion 6 is the thick portion 5. The boundary between the thick portion 5 and the thin portion 6 is preferably located on the corner girder 41 side from the central position of the fork insertion port 10.

The thickness of the thin portion 6 is thinner than the thickness of the thick portion 5. The difference in thickness between the thick portion 5 and the thin portion 6 is preferably 3 mm or more, and more preferably 5 mm or more.

Further, a rib 51 for reinforcement is formed on the outer surface of the thick portion 5, and a rib 61 for reinforcement is formed on the outer surface of the thin portion 6. The ribs 51 and 61 extend in the vertical direction, respectively, and a plurality of ribs 51 and 61 are formed at intervals.

Further, when the fork 9 is inserted into the fork insertion space 11 from the fork insertion port 10, the tip of the fork 9 is more likely to hit the thick portion 5 than the thin portion 6, so that it is less likely to be damaged. Further, the width (horizontal length) of the rib 51 is preferably formed longer than the width of the rib 61. As a result, the thick portion 5 is less likely to be damaged.

Further, it is preferable that the ribs on the outer peripheral side in the plan view of the pallet 1 are formed thicker than the ribs on the inner side.

In the first embodiment, the lower surface of the thick portion 5 is a horizontal plane while the pallet 1 is placed on the horizontal plane. The thickness of the thick portion 5 and the thickness of the thin portion 6 are constant. Further, the lower surface of the thin portion 6 is located above the lower surface of the thick portion 5. Further, a step portion 12 whose thickness changes abruptly is formed between the thick portion 5 and the thin portion 6. As another example, as shown in FIG. 5B, a rib 121 extending in the vertical direction may be formed on the outer surface of the step portion 12 for reinforcement. Stress concentration is likely to occur in the stepped portion 12, and the stepped portion 12 is easily damaged. However, the rib 121 is formed so that the stepped portion 12 is less likely to be damaged.

As shown in FIG. 5A, the thin portion 6 is preferably formed over the entire length of the fork insertion space 11 in the longitudinal direction. That is, the thin-walled portion 6 may be formed in the end upper rail portion 221, the upper rail intersection portion 23, the inner upper rail portion 222, the upper rail intersection portion 23, and the end upper rail portion 221 corresponding to the fork insertion space 11. preferable. Similarly, the thick portion 5 is preferably formed over the entire length of the fork insertion space 11 in the longitudinal direction. In this case, the portion corresponding to the upper crosspiece portion 23 is a portion where the fork insertion space 11 intersects. Therefore, the thin portion 6 of the fork insertion space 11 intersecting the fork insertion space 11 is formed so as to cross a part of the thick portion 5 corresponding to the fork insertion space 11 in the longitudinal direction. Therefore, in the first embodiment, as shown in FIG. 6, the thick portion 5 is formed in a plan view L-shape at each of the four corners of the upper deck portion 2 except for the portion of the upper corner girder 211. Has been done. Further, a thick portion 16 is provided on the crosspiece (that is, the inner upper crosspiece 222) between the middle girder upper portion 212 and the central girder upper portion 213. The thick portion 16 provided on the inner upper rail portion 222 has an arbitrary configuration and may not be provided. When the thick portion 16 is not provided on the inner upper rail portion 222, the central portion tends to be dented downward.

When the fork 9 is inserted into the fork insertion space 11 from the fork insertion port 10 to support the upper deck portion 2, the lower surface of the thick portion 5 is supported by the upper surface of the fork 9, and the lower surface of the thin portion 6 is the upper surface of the fork 9. (However, the lower surface of the thin portion 6 may be supported by the upper surface of the fork 9). For this reason, due to the load placed on the upper surface of the portion between both thick portions 5 of the upper surface deck portion 2 (referred to as a flexible portion), the flexible portion is bent so as to be recessed downward. Receive a moment. The easily flexible portion bends downward when it receives the bending moment. The bending rigidity of the thin-walled portion 6 is lower than the bending rigidity of the thick-walled portion 5, and the thick-walled portion 5 constitutes the high-rigidity portion 7 and the thin-walled portion 6 constitutes the low-rigidity portion 8.

When the flexible portion bends downward, the end side portion of the flexible portion also receives a bending moment that attempts to bend downward as a whole. As a result, it is less likely that the pallet 1 becomes convex upward and the load falls from the pallet 1.

Further, since the step portion 12 is formed between the thick portion 5 and the thin portion 6, when the lower surface of the thick portion 5 is supported by the upper surface of the fork 9, the step portion 12 (particularly the portion of the thick portion 5) is formed. ) Is the base point, and the thin-walled portion 6 is located above the upper surface of the fork 9, so that the bending allowance of the thin-walled portion 6 is secured.

Next, the pallet 1 according to the second embodiment will be described with reference to FIG. 7. The pallet 1 of the second embodiment is almost the same as the pallet 1 of the first embodiment. Therefore, the description that overlaps with the first embodiment will be omitted.

In the first embodiment, the thickness of the thick portion 5 and the thickness of the thin portion 6 were constant. Further, a step portion 12 was formed between the thick portion 5 and the thin portion 6. On the other hand, in the second embodiment, the thickness of the thick portion 5 and the thickness of the thin portion 6 are continuously reduced from the end portion on the corner girder 41 side to the end portion on the intermediate girder 42 side, respectively.

The portion of the upper deck portion 2 corresponding to the fork insertion port 10 (end upper rail portion 221) is uniformly and continuously thinned from the end on the corner girder 41 side to the end on the intermediate girder 42 side as a whole. .. No step portion is formed between the thick portion 5 and the thin portion 6. Therefore, the boundary between the thick portion 5 and the thin portion 6 is not clear, but for convenience, the thick portion 5 is formed at the center of the end of the fork insertion port 10 on the corner girder 41 side and the end on the intermediate girder 42 side. And the thin-walled portion 6. The boundary between the thick portion 5 and the thin portion 6 is not limited to the central portion of the end portion of the fork insertion port 10 on the corner girder 41 side and the end portion on the intermediate girder 42 side. The thick portion 5 constitutes the high-rigidity portion 7, and the thin-walled portion 6 constitutes the low-rigidity portion 8.

In the second embodiment, since a step portion whose thickness changes abruptly is not formed between the thick portion 5 and the thin portion 6, stress concentration is unlikely to occur. As a result, it is possible to prevent the pallet 1 from being broken from the portion where the stress concentration is generated.

Next, the pallet 1 according to the third embodiment will be described with reference to FIG. The pallet 1 of the third embodiment is almost the same as the pallet 1 of the first embodiment. Therefore, the description that overlaps with the first embodiment will be omitted.

In the first embodiment, the thick portion 5 and the thin wall portion 5 and the thin wall portion are formed from the end portion of the upper surface deck portion 2 corresponding to the fork insertion port 10 (end upper rail portion 221) on the corner girder 41 side to the end portion on the intermediate girder 42 side. The portions 6 were positioned in order, two step portions were formed on the end upper rail portion 221, and one step portion 12 was formed. On the other hand, in the third embodiment, the thickness of the end upper rail portion 221 becomes thinner in order from the end portion on the corner girder 41 side of the end upper rail portion 221 to the end portion on the intermediate girder 42 side. Is formed, and a total of two stepped portions are formed between the stepped portions.

In the end upper rail portion 221, the step portion located on the corner girder 41 side is the thickest thick portion 5, and the step portion adjacent to the intermediate girder 42 side of this step portion (the central portion of the end upper rail portion 221). The step portion located at) is a thin portion 6 having a thickness thinner than the step portion located on the corner girder 41 side. The step portion located on the most intermediate girder 42 side is a thin portion 6 having a thickness thinner than the step portion located at the center of the end upper rail portion 221. In this case, the step portion located at the center of the end upper rail portion 221 is the thick portion 5 in relation to the step portion (thin wall portion 6) located on the most intermediate girder 42 side. The thick portion 5 constitutes the high-rigidity portion 7, and the thin-walled portion 6 constitutes the low-rigidity portion 8.

In the third embodiment, since the three stepped portions are formed on the end upper rail portion 221 and the two stepped portions are formed, the fork 9 can be easily positioned across the stepped portion. That is, although the width of the fork 9 or the distance between the two forks 9 differs depending on the hand forklift, the fork 9 inserted into the fork insertion port 10 is likely to be positioned across the step portion. When the fork 9 is positioned across the stepped portion, a bending allowance of the thin-walled portion 6 located on the intermediate girder 42 side of the stepped portion is secured.

Next, the pallet 1 according to the fourth embodiment will be described with reference to FIG. The pallet 1 of the fourth embodiment is almost the same as the pallet 1 of the third embodiment. Therefore, the description that overlaps with the third embodiment will be omitted.

In the third embodiment, three steps are formed from the end on the corner girder 41 side of the end upper rail portion 221 to the end on the intermediate girder 42 side, and the thickness of the end upper rail portion 221 is gradually reduced. A total of two stepped portions were formed between the portions. On the other hand, in the fourth embodiment, the thickness of the end upper rail portion 221 becomes thinner and then becomes thicker from the end portion of the end upper rail portion 221 on the corner girder 41 side to the end portion on the intermediate girder 42 side. Three stepped portions are formed, and a total of two stepped portions are formed between the stepped portions.

In the end upper rail portion 221, the step portion located on the corner girder 41 side is the thickest thick portion 5, and the step portion adjacent to the intermediate girder 42 side of this step portion (the central portion of the end upper rail portion 221). The step portion located at) is a thin portion 6 having a thickness thinner than the step portion located on the corner girder 41 side. The step portion located on the most intermediate girder 42 side is a thick portion 13 thicker than the step portion located at the center of the end upper rail portion 221. The thickness of the thick portion 13 and the thickness of the thick portion 5 are the same, and the lower surface of the thick portion 13 and the lower surface of the thick portion 5 are located on the same plane.

In the fourth embodiment, when the fork 9 is located over the thick portion 5 and the thin portion 6 and straddles the stepped portion between them, the bending allowance of the thin portion 6 is secured. Further, since the strength of the thick portion 13 is larger than the strength of the thin portion 6, the strength of the pallet 1 is improved as compared with the case where the thin portion 6 is continuous with the thick portion 13.

Next, the pallet 1 according to the fifth embodiment will be described with reference to FIG. The pallet 1 of the fifth embodiment is almost the same as the pallet 1 of the fourth embodiment. Therefore, the description that overlaps with the fourth embodiment will be omitted.

In the fourth embodiment, the thick portion 5, the thin portion 6 and the thick portion 13 are sequentially located from the end on the corner girder 41 side of the end upper rail portion 221 to the end on the intermediate girder 42 side. The thickness of 13 and the thickness of the thick portion 5 were the same. On the other hand, in the fifth embodiment, the thick portion 5, the thin portion 6 and the thick portion 14 are sequentially located from the end on the corner girder 41 side of the end upper rail portion 221 to the end on the intermediate girder 42 side. , The thickness of the thick portion 5 is formed to be thicker than the thickness of the thick portion 14.

In the fifth embodiment, when the fork 9 is located over the thick portion 5 and the thin portion 6 and straddles the stepped portion between them, the bending allowance of the thin portion 6 is secured. Further, since the strength of the thick portion 14 is larger than the strength of the thin portion 6, the strength of the pallet 1 is improved as compared with the case where the thin portion 6 is continuous with the thick portion 14.

Next, the pallet 1 according to the sixth embodiment will be described with reference to FIG. The pallet 1 of the sixth embodiment is almost the same as the pallet 1 of the first embodiment. Therefore, the description that overlaps with the first embodiment will be omitted.

In the pallet 1 of the sixth embodiment, the thickness of the upper end rail portion 221 is basically constant, but it protrudes downward from the end portion on the corner girder 41 side to the end portion on the intermediate girder 42 side. A protruding portion 15 is formed, and as a result, the protruding portion 15 becomes a thick portion 5. The protrusion 15 may be integrally formed as a part of the upper end rail portion 221 or may be initially formed as a separate body from the upper end rail portion 221 and integrally formed by welding.

The protrusion 15 is formed only in a part of the fork insertion space 11 in the longitudinal direction. A plurality of protrusions 15 may be formed discretely in the longitudinal direction of the fork insertion space 11. Further, the protrusion 15 may be formed over the entire length of the fork insertion space 11 in the longitudinal direction.

The portion of the protrusion 15 (thick portion 5) on the intermediate girder 42 side is the thin portion 6. The thick portion 5 constitutes the high-rigidity portion 7, the thin-walled portion 6 constitutes the low-rigidity portion 8, and the portion of the protrusion 15 on the corner girder 41 side is also the low-rigidity portion 8.

In the sixth embodiment, the protrusion 15 formed in a part from the end on the corner girder 41 side to the end on the intermediate girder 42 side and in a part in the longitudinal direction of the fork insertion space 11 Since the thick portion 5 is formed, the thick portion 5 can be formed by a simple structure.

Next, the pallet 1 according to the seventh embodiment will be described. The pallet 1 of the seventh embodiment is almost the same as the pallet 1 of the first embodiment. Therefore, the description that overlaps with the first embodiment will be omitted.

In the first embodiment, the portion of the upper surface deck portion 2 corresponding to the fork insertion port 10 (end upper rail portion 221) has a thick portion 5 and a thin portion 6. On the other hand, in the seventh embodiment, the thickness of the upper end rail portion 221 is constant from the end portion on the corner girder 41 side to the end portion on the intermediate girder 42 side, but the portion on the corner girder 41 side has high rigidity. A portion 7 is formed, and a low-rigidity portion 8 is formed on a portion on the intermediate girder 42 side.

In the high-rigidity portion 7 and the low-rigidity portion 8, for example, the elastic modulus (Young's modulus) of the material of the high-rigidity portion 7 may be made larger than the elastic modulus of the material of the low-rigidity portion 8, one of which has a hollow structure and the other. It is realized by making the structure different, such as making it a solid structure.

In the seventh embodiment, it is possible to form the high-rigidity portion 7 and the low-rigidity portion 8 while keeping the thickness of the end upper rail portion 221 constant.

Next, the pallet 1 according to the eighth embodiment will be described with reference to FIG. The pallet 1 of the eighth embodiment is almost the same as the pallet 1 of any one of the first to seventh embodiments. Therefore, the description that overlaps with the palette 1 of the first to seventh embodiments will be omitted.

The pallet 1 of the eighth embodiment is different from the pallet 1 of any one of the first to seventh embodiments in that the lower deck portion 3 is not provided. In the pallet 1 of the eighth embodiment, the corner girder 41 projects downward from each corner of the upper deck portion 2. Further, the intermediate girder 42 projects downward from the intermediate portion of each side of the upper surface deck portion 2. Further, the central girder 43 projects downward from the central portion of the upper deck portion 2. The fork insertion port 10 is formed between the corner girder 41 and the intermediate girder 42. The upper deck portion 2, the thick portion 5, the thin portion 6, the high rigidity portion 7, the low rigidity portion 8, and the like are the same as the pallet 1 of any one of the first to seventh embodiments. The same is true.

The pallet 1 of the eighth embodiment can obtain the effect of the pallet 1 of any one of the first to seventh embodiments.

Next, a modified example of the above-described embodiment will be described.

In the pallet 1, the upper surface deck portion 2, the lower surface deck portion 3, and the girder portion 4 do not have to be integrally formed, and may be formed separately and then welded.

The strength of pallet 1 is not limited to type B in the JISZ0602 test.

The pallet 1 may be formed as a double-sided pallet 1. In this case, the upper deck portion 2 and the lower deck portion 3 may be formed to be the same, and either the upper deck portion 2 or the lower deck portion 3 may be located on the upper side in the used state.

The upper deck portion 2 and the lower deck portion 3 may be formed in a rectangular shape in a plan view. Further, the upper surface deck portion 2 and the lower surface deck portion 3 do not have to be formed in a strict rectangular shape in a plan view.

In the lower deck portion 3 of the first to seventh embodiments, a total of eight lower end rail portions 321 are provided on each of the four sides, and the inner lower rail portion 322 is the lower center girder 313. A total of four were provided radially at a right angle of 90 degrees. On the other hand, a total of four lower end rails 321 and a total of two located in the pair of two fork insertion spaces 11 of the two pairs of fork insertion spaces 11 forming a well shape. The lower rail portion 322 may be eliminated. In this case as well, the pallet 1 is a so-called four-sided pallet.

Further, the lower surface deck portion 3 has an arbitrary configuration and does not need to be provided.

The corner girder upper part 211, the intermediate girder upper part 212, the central girder upper part 213, the end upper rail portion 221 and the inner upper rail portion 222 and the upper rail inter-section portion 23 may be formed in a plate shape, and the structure is not particularly limited.

The upper surface of the girder upper portion 21, the upper rail portion 22, and the upper rail portion 23 of the upper deck portion 2 do not necessarily have to be located on the same plane.

The lower corner girder 311, the lower middle girder 312, the lower central girder 313, the lower end rail portion 321 and the inner lower rail portion 322 may be formed in a plate shape, and the structure is not particularly limited.

The lower surface of the girder portion 31 of the lower surface deck portion 3 and the lower surface of the lower rail portion 32 do not necessarily have to be located on the same plane.

The shape and structure of the tubular portion 44 of the corner girder 41, the intermediate girder 42, and the central girder 43 are not particularly limited.

The shape of the thick portion 5 is not limited to the L-shape in a plan view.

The rib 51 formed on the outer surface of the thick portion 5 and the rib 61 formed on the outer surface of the thin portion 6 have an arbitrary configuration and may not be provided.

As is clear from the first to seventh embodiments described above and the modified examples thereof, the pallet (1) of the first embodiment includes a top deck portion (2) formed in a rectangular shape in a plan view. It includes a lower deck portion (3) formed in a rectangular shape in a plan view, a corner girder (41), an intermediate girder (42), and a central girder (43). The corner girder (41) connects each corner of the upper deck portion (2) and each corner of the lower deck portion (3), respectively. The intermediate girder (42) connects the intermediate portion of each side of the upper deck portion (2) and the intermediate portion of each side of the lower deck portion (3), respectively. The central girder (43) connects the central portion of the upper deck portion (2) and the central portion of the lower deck portion (3), respectively. The pallet (1) has a fork insertion port (10) formed between the upper deck portion (2) and the lower deck portion (3) and between the corner girder (41) and the intermediate girder (42). Will be done. The pallet (1) has a thick portion (5) on the corner girder (41) side in a portion on the intermediate girder (42) side in a portion corresponding to the fork insertion port (10) of the upper deck portion (2). It has a thin portion (6) that is thinner than the thickness of the portion.

According to the first aspect, when a bending moment that lowers the portion on the intermediate girder (42) side due to the load loaded on the portion on the intermediate girder (42) side is applied to the thin portion (6), the thin portion It bends at (6) and the part on the intermediate girder (42) side becomes low and dents downward. As a result, a force that causes the load to tilt toward the center acts on the load placed on the pallet (1), so that the load is less likely to crack.

The pallet (1) of the second aspect includes an upper deck portion (2) formed in a rectangular shape in a plan view, a corner girder (41), an intermediate girder (42), and a central girder (43). .. The corner girder (41) projects downward from each corner of the upper deck portion (2). The intermediate girder (42) projects downward from the intermediate portion of each side of the upper deck portion (2). The central girder (43) projects downward from the central portion of the upper deck portion (2). In the pallet (1), a fork insertion port (10) is formed between the corner girder (41) and the intermediate girder (42). The pallet (1) has a thick portion (5) on the corner girder (41) side in a portion on the intermediate girder (42) side in a portion corresponding to the fork insertion port (10) of the upper deck portion (2). It has a thin portion (6) that is thinner than the thickness of the portion.

According to the second aspect, when a bending moment that lowers the portion on the intermediate girder (42) side is applied to the thin portion (6) due to the load loaded on the portion on the intermediate girder (42) side, the thin portion (6) is subjected to the bending moment. It bends at (6) and the part on the intermediate girder (42) side becomes low and dents downward. As a result, a force that causes the load to tilt toward the center acts on the load placed on the pallet (1), so that the load is less likely to crack.

The third aspect can be realized in combination with the first or second aspect. In the third aspect, the pallet (1) has a stepped portion between the thin portion (6) and the thick portion (5) in the portion of the upper deck portion (2) corresponding to the fork insertion port (10). It has (12).

According to the third aspect, since the stepped portion (12) is formed, the bending allowance of the thin-walled portion (6) is secured.

The fourth aspect can be realized in combination with the third aspect. In the fourth aspect, the pallet (1) is a protruding portion that protrudes downward to become a thick portion (5) in the middle portion of the portion of the upper deck portion (2) corresponding to the fork insertion port (10). (15).

According to the fourth aspect, the thick portion (5) can be formed by a simple structure.

The pallet (1) of the fifth aspect includes an upper deck portion (2) formed in a rectangular shape in a plan view, a lower deck portion (3) formed in a rectangular shape in a plan view, a corner girder (41), and the like. It includes an intermediate girder (42) and a central girder (43). The corner girder (41) connects each corner of the upper deck portion (2) and each corner of the lower deck portion (3), respectively. The intermediate girder (42) connects the intermediate portion of each side of the upper deck portion (2) and the intermediate portion of each side of the lower deck portion (3), respectively. The central girder (43) connects the central portion of the upper deck portion (2) and the central portion of the lower deck portion (3), respectively. The pallet (1) has a fork insertion port (10) formed between the upper deck portion (2) and the lower deck portion (3) and between the corner girder (41) and the intermediate girder (42). Will be done. In the portion of the upper deck portion (2) corresponding to the fork insertion port (10), the pallet (1) has a flexural rigidity in the portion on the intermediate girder (42) side rather than the flexural rigidity in the portion on the corner girder (41) side. Has a low rigidity portion (8).

According to the fifth aspect, when the bending moment such that the portion on the intermediate girder (42) side is lowered due to the load loaded on the portion on the intermediate girder (42) side is applied to the low rigidity portion (8), the bending moment is low. It bends at the rigid portion (8) and the portion on the intermediate girder (42) side becomes low and dents downward. As a result, it is less likely that the pallet (1) becomes convex upward and the load falls from the pallet (1).

1 Pallet 10 Fork insertion port 12 Step part 15 Protrusion part 2 Upper deck part 3 Lower deck part 41 Corner girder 42 Intermediate girder 5 Thick part 6 Thin part 8 Low rigidity part

Claims (5)

The upper deck part formed in a rectangular shape in a plan view and
The lower deck part formed in a rectangular shape in a plan view and
Corner girders that connect each corner of the upper deck and each corner of the lower deck,
An intermediate girder that connects the intermediate portion of each side of the upper surface deck portion and the intermediate portion of each side of the lower surface deck portion, respectively.
A central girder for connecting the central portion of the upper surface deck portion and the central portion of the lower surface deck portion is provided.
A pallet in which a fork insertion port is formed between the upper surface deck portion and the lower surface deck portion and between the corner girder and the intermediate girder.
A pallet having a portion of the upper surface deck portion corresponding to the fork insertion port, the portion on the intermediate girder side having a thin portion having a thickness thinner than the thickness of the portion to be the thick portion on the corner girder side. The upper deck part formed in a rectangular shape in a plan view and
A corner girder protruding downward from each corner of the upper deck portion,
An intermediate girder protruding downward from the intermediate portion of each side of the upper deck portion, and
A central girder projecting downward from the central portion of the upper deck portion is provided.
A pallet in which a fork insertion slot is formed between the corner girder and the intermediate girder.
A pallet having a portion of the upper surface deck portion corresponding to the fork insertion port, the portion on the intermediate girder side having a thin portion having a thickness thinner than the thickness of the portion to be the thick portion on the corner girder side. The pallet according to claim 1 or 2, wherein a step portion is provided between the thin portion and the thick portion in a portion of the upper surface deck portion corresponding to the fork insertion port. The pallet according to claim 3, further comprising a protruding portion that protrudes downward to form the thick portion in the middle portion of the upper surface deck portion corresponding to the fork insertion port. The upper deck part formed in a rectangular shape in a plan view and
The lower deck part formed in a rectangular shape in a plan view and
Corner girders that connect each corner of the upper deck and each corner of the lower deck,
An intermediate girder that connects the intermediate portion of each side of the upper surface deck portion and the intermediate portion of each side of the lower surface deck portion, respectively.
A central girder for connecting the central portion of the upper deck portion and the central portion of the lower deck portion is provided.
A pallet in which a fork insertion port is formed between the upper surface deck portion and the lower surface deck portion and between the corner girder and the intermediate girder.
A pallet having a portion of the upper surface deck portion corresponding to the fork insertion port, the portion on the intermediate girder side having a low rigidity portion having a bending rigidity lower than the bending rigidity of the portion on the corner girder side.

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