JP7382051B2 - palette - Google Patents

Description

The present invention relates to a pallet, and more specifically, the pallet includes an upper deck portion, a lower deck portion, a corner girder, an intermediate girder, and a center girder, and is arranged between the upper deck portion and the lower deck portion, and between the corner girder and the intermediate girder. The present invention relates to a pallet having a fork insertion opening formed between the pallets.

Conventionally, a synthetic resin pallet has been known in which a plurality of girders are arranged between the front and back parts to connect the front and back parts, and a fork insertion opening is formed between adjacent girders. (For example, see Patent Document 1).

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

The pallet with cargo 91 loaded on its surface is transported with the fork of a forklift being inserted into the fork insertion opening and lifted up.

Patent No. 4564157

However, when a pallet is lifted up by inserting a fork into the fork insertion slot, as shown in FIG. There was a risk that this would occur.

In addition, if the cargo placed on a pallet breaks and protrudes beyond the outer dimensions of the pallet, when packing the cargo and pallets into a designated space such as a truck or warehouse, the broken cargo will occupy the space first. There is a risk that it will hit the luggage next to it and you will not be able to fit it into the space. In this case, the pallet carried with a fork is placed on the floor, and the pallet must be dragged or pushed into the space while being placed on the floor to prevent it from bending, which takes time and effort. there were.

The present invention was invented in view of the above-mentioned conventional problems, and its purpose is to provide a pallet that does not easily bend upwardly even when cargo is placed thereon.

In order to solve the above problems, a pallet according to one embodiment of 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, corner girders, and an intermediate girder. and a central girder. The corner beams connect each corner of the upper deck portion and each corner of the lower deck portion, respectively. The intermediate girder connects a middle part of each side of the upper deck part and a middle part of each side of the lower deck part. The central girder connects a central portion of the upper deck portion and a central portion of the lower deck portion, respectively. A fork insertion opening is formed in the pallet between the upper deck portion and the lower deck portion and between the corner beam and the intermediate beam. The pallet has a thin part on the intermediate girder side, which is thinner than a thick part on the corner girder side, in a portion of the upper deck portion corresponding to the fork insertion opening.

Another form of the pallet according to the present invention includes an upper deck portion formed in a rectangular shape in plan view, a corner beam, an intermediate beam, and a center beam. The corner beams protrude downward from each corner of the upper deck portion. The intermediate girder protrudes downward from an intermediate portion of each side of the upper deck portion. The center girder projects downward from the center of the upper deck portion. A fork insertion opening is formed in the pallet between the corner beam and the intermediate beam. The pallet has a thin part on the intermediate girder side, which is thinner than a thick part on the corner girder side, in a portion of the upper deck portion corresponding to the fork insertion opening.

In order to solve the above problems, a pallet of still another form according to the present invention includes an upper deck portion formed in a rectangular shape in plan view, a lower deck portion formed in a rectangular shape in plan view, corner girders, and an intermediate deck portion. It includes a girder and a center girder. The corner beams connect each corner of the upper deck portion and each corner of the lower deck portion, respectively. The intermediate girder connects a middle part of each side of the upper deck part and a middle part of each side of the lower deck part. The central girder connects a central portion of the upper deck portion and a central portion of the lower deck portion, respectively. A fork insertion opening is formed in the pallet between the upper deck portion and the lower deck portion and between the corner beam and the intermediate beam. The pallet has a low-rigidity portion, which has a lower bending rigidity than a portion on the corner girder side, in a portion on the intermediate girder side in a portion of the upper deck portion corresponding to the fork insertion opening.

In the pallet according to the present invention, when a bending moment that lowers the intermediate girder side due to the cargo loaded on the intermediate girder side is applied to the thin walled portion or the low rigidity portion, the thin walled portion or the low rigidity portion The middle girder side becomes lower and dents downward. When the area near the middle girder side of the pallet is depressed downward, a force is applied to the load that causes the load to tilt toward the center, making it less likely that the load will 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 as above. FIG. 4 is a cross-sectional view of the above 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 above pallet cut at the center of the top and bottom when viewed from below. FIG. 7 is a side view of a pallet according to the second embodiment. FIG. 8 is a side view of a pallet according to the third embodiment. FIG. 9 is a side view of a pallet according to the fourth embodiment. FIG. 10 is a side view of a pallet according to the fifth embodiment. FIG. 11 is a side view of a pallet according to the sixth embodiment. FIG. 12 is a side view of a pallet according to the eighth embodiment. FIG. 13A is a side view of a conventional pallet in an undeformed state. FIG. 13B is a side view of the same pallet as above in a bent state.

The present invention relates to a pallet. DESCRIPTION OF THE PREFERRED EMBODIMENTS A pallet according to the present invention will be described below based on embodiments shown in the accompanying drawings.

The pallet according to the first embodiment will be explained based on FIGS. 1 to 5B. The strength of the pallet according to the first embodiment is Class B in the JIS Z0602 test.

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

The upper deck portion 2 is formed in a rectangular shape in a plan view as shown in FIG. 2, and the lower 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, the upper deck section 2 and the lower deck section 3 are both square shaped, have the same shape, and have the same size in plan view, and are arranged so that their outer contours overlap in plan view. They are arranged vertically at intervals.

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

The corner girder upper portions 211 are located at each of the four corners of the upper deck portion 2 in plan view. The corner girder upper part 211 is formed by connecting a rib 24 along one side of the upper surface deck portion 2, which has a rectangular shape (square shape) in a plan view, with a rib 25 perpendicular to the rib 24. The corner girder upper part 211 is formed into a mesh shape having through holes passing through the upper and lower sides. The corner beam upper part 211 is located above the corner beam 41, which will be described later, and is formed integrally with the corner beam 41.

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

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

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

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

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

The upper crosspiece portions 23 are located in a portion surrounded by the upper crosspieces 22 on four sides, and are connected to the upper crosspieces 22, respectively. A total of four upper interpiece portions 23 are provided. The upper crosspiece part 23 is formed in a mesh shape having ribs and through holes similar to the corner beam upper part 211.

The upper surfaces of the girder upper part 21, the upper crosspiece part 22, and the upper crosspiece part 23 of the upper surface deck part 2 are located on the same plane.

As shown in FIG. 3, the lower deck portion 3 includes a girder lower portion 31 and a lower crosspiece portion 32. The girder lower part 31 is located below the girder part 4. The lower deck portion 3 includes a corner girder lower portion 311, an intermediate girder lower portion 312, and a center girder lower portion 313 as the girder lower portion 31.

The lower corner beams 311 are located at each of the four corners of the lower deck portion 3 in plan view. The lower corner beam 311 is formed by connecting a rib 34 along one side of the lower deck portion 3 with a rib 35 perpendicular thereto in plan view. The corner girder lower part 311 is formed into a mesh shape having a through hole passing through the upper and lower sides. The corner beam lower part 311 is located below the corner beam 41 and is formed integrally with the corner beam 41.

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

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

The lower crosspiece portion 32 is located between the two girder lower portions 31 and connects the two girder lower portions 31. The lower deck portion 3 includes, as the lower crosspiece 32, an end lower crosspiece 321 and an inner lower crosspiece 322.

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

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

The lower deck section 3 does not have a structure corresponding to the upper inter-piece section 23 of the upper deck section 2. A cross-piece opening 33 (see FIG. 4) that penetrates vertically is formed in a portion where the four sides of the lower deck portion 3 are surrounded by the lower crosspiece portion 32. A total of four inter-piece openings 33 are provided.

The lower surfaces of the girder lower part 31 and the lower crosspiece part 32 of the lower deck part 3 are located on the same plane.

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

The corner beams 41 connect each corner of the upper deck portion 2 and each corner of the lower deck portion 3, respectively. Specifically, the corner beam upper part 211 of the upper surface deck part 2 and the corner beam lower part 311 of the lower surface deck part 3 located below the corner beam upper part 211 are connected by the corner beam 41, respectively. As shown in FIG. 4, a total of four corner beams 41 are provided. The corner beam 41 has a cylindrical portion 44 extending in the vertical direction. The shape of the cylindrical portion 44 in a horizontal cross section is approximately square. Furthermore, the inside of the cylindrical portion 44 of the corner beam 41 is formed by a rib 45 along one side of the upper deck portion 2 in plan view and a rib connected orthogonally to the rib 45 .

The intermediate girder 42 connects the middle part of each side of the upper deck part 2 and the middle part of each side of the lower deck part 3, respectively. Specifically, the intermediate spar upper part 212 of the upper surface deck part 2 and the intermediate spar lower part 312 of the lower surface deck part 3 located below the intermediate spar upper part 212 are connected by the intermediate spar 42. A total of four intermediate girders 42 are provided. Like the corner beam 41, the intermediate beam 42 has a cylindrical portion 44 that extends in the vertical direction. The shape of the cylindrical portion 44 in a horizontal cross section is approximately square. Furthermore, the inside of the cylindrical portion 44 of the intermediate beam 42 is formed by a rib along one side of the upper deck portion 2 in plan view and a rib connected orthogonally to the rib.

The center beam 43 connects the center portion of the upper deck portion 2 and the center portion of the lower deck portion 3, respectively. Specifically, the center girder upper part 213 of the upper surface deck part 2 and the center girder lower part 313 of the lower surface deck part 3 are connected by the center girder 43. The center beam 43, like the corner beams 41 and the intermediate beam 42, has a cylindrical portion 44 that extends in the vertical direction. The shape of the cylindrical portion 44 in a horizontal cross section is approximately square. Furthermore, the inside of the cylindrical portion 44 of the central beam 43 is formed by a rib along one side of the upper deck portion 2 in plan view and a rib connected orthogonally to the rib.

When the lower surfaces of the girder lower part 31 and the lower crosspiece part 32 of the lower surface deck part 3 are placed on a horizontal surface, the upper surfaces of the girder upper part 21, the upper crosspiece part 22 and the upper crosspiece part 23 of the upper surface deck part 2 are on the same horizontal surface. Located on a plane. 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 opening 10. As shown in FIG. The fork insertion opening 10 is formed between the upper surface deck portion 2 and the lower surface deck portion 3 and between the corner beam 41 and the intermediate beam 42. Specifically, as shown in FIG. 5A, the fork insertion opening 10 has an upper end crosspiece 221 on the upper side, a lower end crosspiece 321 on the lower side, and corner beams 41 and intermediate beams 42 on the sides. This is the part surrounded by these. The fork insertion openings 10 correspond to each pair of the upper end crosspiece 221 and the lower end crosspiece 321, and two fork insertion openings 10 are provided on each of the four sides of the pallet 1, for a total of eight.

The fork insertion port 10 is open toward the side, and a fork 9 (see broken line in FIG. 5A) of a hand forklift is inserted into the fork insertion port 10. The fork 9 is inserted through a fork insertion opening 10 formed on one side of the pallet 1, and the tip of the fork 9 slightly protrudes from the fork insertion opening 10 formed on the opposite side of the pallet 1, but it does not necessarily have to be inserted into the fork 9. The tip of the fork does not need to come out from the fork insertion opening 10. A series of spaces into which the fork 9 can be inserted is a fork insertion space 11. That is, the fork insertion space 11 is formed between the upper end crosspiece 221 and the lower end crosspiece 321 (fork insertion opening 10), between the upper crosspiece 23 and the opening 33, and between the inner upper crosspiece 222 and the inner crosspiece. A series of spaces that reach in order between the lower crosspiece part 322, between the upper crosspiece part 23 and the inter-piece opening 33, and between the upper end crosspiece part 221 and the lower end crosspiece part 321 (fork insertion opening 10). configured. Two fork insertion spaces 11 are arranged side by side on one side of the pallet 1 and the side opposite thereto, and two fork insertion spaces 11 are arranged side by side on the side adjacent to one side of the pallet 1 and the side opposite thereto, so that a total of four fork insertion spaces 11 are provided. It is provided so as to form a square shape when viewed from above. The pallet 1 is a so-called four-sided pallet.

In the pallet 1, a fork 9 is inserted through a fork insertion opening 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, the upper deck portion 2 is bent upwardly to become convex, and the cargo 91 is removed from the pallet 1, as shown in FIG. 13B. There was a risk of falling.

Therefore, in order to make the upper deck portion 2 (pallet 1) difficult to bend so as to project upward, the pallet 1 of the first embodiment has a thin wall portion 6, as shown in FIG. 5A. The thin portion 6 is formed in a portion of the upper deck portion 2 corresponding to the fork insertion port 10 (ie, the upper end crosspiece portion 221) on the intermediate beam 42 side. In the end upper crosspiece portion 221, a portion closer to the corner girder 41 than the thin wall portion 6 becomes the thick wall portion 5. The boundary between the thick part 5 and the thin part 6 is preferably located closer to the corner beam 41 than the center of the fork insertion opening 10.

The thickness of the thin part 6 is thinner than the thickness of the thick part 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, ribs 51 for reinforcement are formed on the outer surface of the thick portion 5, and ribs 61 for reinforcement are formed on the outer surface of the thin portion 6. The ribs 51 and 61 each extend in the vertical direction, and are formed in plural at intervals.

Further, when the fork 9 is inserted into the fork insertion space 11 through the fork insertion opening 10, the tip of the fork 9 is more likely to hit the thick wall portion 5 than the thin wall portion 6, and is therefore less likely to be damaged. Furthermore, it is preferable that the width (horizontal length) of the rib 51 is longer than the width of the rib 61. This makes it even more difficult for the thick portion 5 to be damaged.

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

In the first embodiment, when the pallet 1 is placed on a horizontal surface, the lower surface of the thick portion 5 becomes a horizontal surface. The thickness of the thick portion 5 and the thickness of the thin portion 6 are each constant. Further, the lower surface of the thin portion 6 is located above the lower surface of the thick portion 5. Furthermore, a stepped portion 12 whose thickness changes rapidly is formed between the thick portion 5 and the thin portion 6. As another example, as shown in FIG. 5B, ribs 121 extending in the vertical direction may be formed on the outer surface of the stepped portion 12 for reinforcement. Although the step portion 12 is prone to stress concentration and is easily damaged, the formation of the ribs 121 makes the step portion 12 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 portion 6 may be formed in the upper end crosspiece 221, the upper inter-piece part 23, the inner upper crosspiece 222, the upper inter-piece part 23, and the upper end crosspiece 221, which correspond 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 that intersects with the fork insertion space 11 is formed across a part of the thick portion 5 in the longitudinal direction corresponding to the fork insertion space 11 . Therefore, in the first embodiment, as shown in FIG. 6, the thick portions 5 are formed in an L-shape in plan view at each of the four corners of the upper deck portion 2, excluding the corner girder upper portion 211. has been done. Further, a thick wall portion 16 is provided on the crosspiece between the intermediate girder upper portion 212 and the center girder upper portion 213 (namely, the inner upper crosspiece portion 222). Note that the thick portion 16 provided on the inner upper crosspiece portion 222 has an arbitrary configuration and may not be provided. If the thick portion 16 is not provided on the inner upper crosspiece portion 222, the central portion is likely to be depressed downward.

When the fork 9 is inserted into the fork insertion space 11 through the fork insertion opening 10 and supports 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 supported by 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, the part between both thick-walled parts 5 of the upper deck part 2 (which is a part that is easy to bend) due to the cargo placed on the upper surface, the part that is easy to bend is bent so that it is bent downward. Receive moments. When the bendable portion receives the bending moment, it bends downward. The bending rigidity of the thin wall portion 6 is lower than that of the thick wall portion 5, and the thick wall portion 5 constitutes a high rigidity portion 7, and the thin wall portion 6 constitutes a low rigidity portion 8.

When the easily-flexible portion bends downwardly, the end portion of the easily-flexible portion also receives a bending moment that causes the entire portion to bend downwardly. As a result, the pallet 1 becomes convex upward and the cargo is less likely to fall from the pallet 1.

Further, since the stepped 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 stepped portion 12 (particularly the portion of the thick portion 5) ) is the reference point, and since the thin wall portion 6 is located above the upper surface of the fork 9, the bending allowance of the thin wall portion 6 is secured.

Next, a pallet 1 according to a second embodiment will be described based on FIG. 7. Note that the pallet 1 of the second embodiment is mostly the same as the pallet 1 of the first embodiment. Therefore, descriptions that overlap with those of 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 each constant. Further, a stepped 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 each continuously reduced from the end on the corner beam 41 side to the end on the intermediate beam 42 side.

The portion of the upper deck portion 2 corresponding to the fork insertion port 10 (the upper end crosspiece 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 wall portion 5 and the thin wall portion 6 is not clear, but for convenience, the thick wall portion 5 and the thin wall portion 6. Note that the boundary between the thick part 5 and the thin part 6 is not limited to the center between the end of the fork insertion port 10 on the corner beam 41 side and the end on the intermediate beam 42 side. The thick portion 5 constitutes a high-rigidity portion 7, and the thin-walled portion 6 constitutes a low-rigidity portion 8.

In the second embodiment, a step portion where the thickness changes rapidly is not formed between the thick portion 5 and the thin portion 6, so that stress concentration is less likely to occur. As a result, it is possible to prevent the pallet 1 from being destroyed at the portion where stress concentration occurs.

Next, a pallet 1 according to a third embodiment will be explained based on FIG. 8. Note that the pallet 1 of the third embodiment is mostly the same as the pallet 1 of the first embodiment. Therefore, descriptions that overlap with those of the first embodiment will be omitted.

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

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

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

Next, a pallet 1 according to a fourth embodiment will be described based on FIG. 9. Note that the pallet 1 of the fourth embodiment is mostly the same as the pallet 1 of the third embodiment. Therefore, descriptions that overlap with those of the third embodiment will be omitted.

In the third embodiment, three step portions are formed in which the thickness of the end upper crosspiece 221 becomes thinner in order from the end of the upper end crosspiece 221 on the corner beam 41 side to the end on the intermediate beam 42 side. A total of two stepped portions were formed between the sections. On the other hand, in the fourth embodiment, the thickness of the end upper crosspiece 221 becomes thinner from the end on the corner girder 41 side to the end on the intermediate girder 42 side, and then becomes thicker. Three step portions are formed, and a total of two step portions are formed between the step portions.

In the end upper crosspiece 221, the step located closest to the corner beam 41 becomes the thickest thick part 5, and the step adjacent to the intermediate beam 42 side of this step (the central part of the end upper crosspiece 221) The step portion located at ) becomes a thin wall portion 6 that is thinner than the step portion located closest to the corner girder 41 . The step portion located closest to the intermediate girder 42 becomes the thick portion 13 that is thicker than the step portion located at the center of the end upper crosspiece 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 positioned across the thick part 5 and the thin part 6 and straddles the stepped part between them, the bending allowance of the thin part 6 is ensured. Further, since the strength of the thick wall portion 13 is greater than the strength of the thin wall portion 6, the strength of the pallet 1 is improved compared to a case where the thin wall portion 6 is continuous to the thick wall portion 13.

Next, a pallet 1 according to a fifth embodiment will be described based on FIG. 10. Note that the pallet 1 of the fifth embodiment is mostly the same as the pallet 1 of the fourth embodiment. Therefore, descriptions that overlap with those of the fourth embodiment will be omitted.

In the fourth embodiment, the thick part 5, the thin part 6, and the thick part 13 are located in this order from the end on the corner beam 41 side of the end upper crosspiece 221 to the end on the intermediate beam 42 side. The thickness of No. 13 and the thickness of thick portion 5 were the same. On the other hand, in the fifth embodiment, the thick part 5, the thin part 6, and the thick part 14 are located in this order from the end of the upper end crosspiece 221 on the corner beam 41 side to the end on the intermediate beam 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 positioned across the thick part 5 and the thin part 6 and straddles the stepped part between them, the bending allowance of the thin part 6 is ensured. Further, since the strength of the thick wall portion 14 is greater than the strength of the thin wall portion 6, the strength of the pallet 1 is improved compared to a case where the thin wall portion 6 is continuous to the thick wall portion 14.

Next, a pallet 1 according to the sixth embodiment will be described based on FIG. 11. Note that the pallet 1 of the sixth embodiment is mostly the same as the pallet 1 of the first embodiment. Therefore, descriptions that overlap with those of the first embodiment will be omitted.

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

The protrusion 15 is formed only in a portion 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. Furthermore, the protrusion 15 may be formed over the entire length of the fork insertion space 11 in the longitudinal direction.

A portion of the protruding portion 15 (thick wall portion 5) on the intermediate girder 42 side becomes the thin wall portion 6. The thick portion 5 constitutes a high rigidity portion 7, and the thin portion 6 constitutes a low rigidity portion 8, and the portion of the protrusion 15 on the corner beam 41 side also serves as the low rigidity portion 8.

In the sixth embodiment, the projection 15 is formed in a portion from the end on the corner beam 41 side to the end on the intermediate beam 42 side, and is formed in a portion in the longitudinal direction of the fork insertion space 11. Since the thick portion 5 is formed, the thick portion 5 can be formed with a simple configuration.

Next, a pallet 1 according to a seventh embodiment will be described. Note that the pallet 1 of the seventh embodiment is mostly the same as the pallet 1 of the first embodiment. Therefore, descriptions that overlap with those of the first embodiment will be omitted.

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

The high-rigidity portion 7 and the low-rigidity portion 8 may be formed by, for example, making the elastic modulus (Young's modulus) of the material of the high-rigidity portion 7 larger than the elastic modulus of the material of the low-rigidity portion 8, or forming one of them into a hollow structure and forming the other. This can be achieved by making the structure different, such as by 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 upper end crosspiece 221 constant.

Next, a pallet 1 according to an eighth embodiment will be described based on FIG. 12. Note that the pallet 1 of the eighth embodiment is mostly the same as the pallet 1 of any one of the first to seventh embodiments. Therefore, descriptions that overlap with those of the palette 1 of the first to seventh embodiments will be omitted.

The pallet 1 of the eighth embodiment differs from the pallet 1 of any of the first to seventh embodiments in that it does not include the lower deck portion 3. In the pallet 1 of the eighth embodiment, the corner beams 41 protrude downward from each corner of the upper deck portion 2. Further, the intermediate girder 42 protrudes downward from the intermediate portion of each side of the upper deck portion 2. Further, the center girder 43 protrudes downward from the center of the upper deck portion 2. The fork insertion opening 10 is formed between the corner beam 41 and the intermediate beam 42. The upper deck portion 2, the thick wall portion 5, the thin wall portion 6, the high rigidity portion 7, the low rigidity portion 8, etc. are the pallet 1 of any one of the pallets 1 of the first to seventh embodiments, respectively. The same is true.

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

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

In the pallet 1, the upper deck part 2, the lower deck part 3, and the girder part 4 do not have to be integrally molded, but may be molded separately and then welded together.

The strength of the pallet 1 is not limited to class B in the JIS Z0602 test.

The pallet 1 may also 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 use state.

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

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

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

The corner girder upper part 211, the middle girder upper part 212, the central girder upper part 213, the upper end crosspiece 221, the inner upper crosspiece 222, and the upper crosspiece part 23 may be formed in a plate shape, and their structures are not particularly limited.

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

The corner girder lower part 311, the intermediate girder lower part 312, the central girder lower part 313, the end lower crosspiece 321, and the inner lower crosspiece 322 may be formed in a plate shape, and their structures are not particularly limited.

The lower surfaces of the girder lower part 31 and the lower crosspiece part 32 of the lower deck part 3 do not necessarily have to be located on the same plane.

The shapes and structures of the cylindrical portions 44 of the corner beams 41, intermediate beams 42, and central beams 43 are not particularly limited.

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

The ribs 51 formed on the outer surface of the thick wall portion 5 and the ribs 61 formed on the outer surface of the thin wall portion 6 have arbitrary configurations, and do not need to be provided.

As is clear from the above-described first to seventh embodiments and their modifications, the pallet (1) of the first aspect includes an upper deck portion (2) formed in a rectangular shape in plan view; It includes a lower deck portion (3) formed into a rectangular shape in plan view, a corner beam (41), an intermediate beam (42), and a center beam (43). The corner beams (41) connect each corner of the upper deck part (2) and each corner of the lower deck part (3), respectively. The intermediate girder (42) connects the middle part of each side of the upper deck part (2) and the middle part of each side of the lower deck part (3), respectively. The center girder (43) connects the center portion of the upper deck portion (2) and the center portion of the lower deck portion (3), respectively. A fork insertion opening (10) is formed in the pallet (1) between the upper deck part (2) and the lower deck part (3) and between the corner girder (41) and the intermediate girder (42). be done. The pallet (1) has a thick wall 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 part (6) which is thinner than the thickness of the other part.

According to the first aspect, when a bending moment is applied to the thin-walled portion (6) due to the cargo loaded on the portion on the intermediate girder (42) side, which lowers the portion on the intermediate girder (42) side, the thin-walled portion It bends at (6) and the part on the intermediate girder (42) side becomes lower and concave downward. As a result, a force is applied to the cargo placed on the pallet (1) that causes the cargo to tilt toward the center, making it difficult for the cargo to crack.

The pallet (1) of the second aspect includes an upper deck portion (2) formed into a rectangular shape in plan view, a corner beam (41), an intermediate beam (42), and a center beam (43). . The corner beams (41) protrude 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 center girder (43) projects downward from the center of the upper deck portion (2). A fork insertion opening (10) is formed in the pallet (1) between the corner beam (41) and the intermediate beam (42). The pallet (1) has a thick wall 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 part (6) which is thinner than the thickness of the other part.

According to the second aspect, when a bending moment that lowers the part on the intermediate girder (42) side due to the cargo loaded on the intermediate girder (42) side is applied to the thin wall part (6), the thin wall part It bends at (6) and the part on the intermediate girder (42) side becomes lower and concave downward. As a result, a force is applied to the cargo placed on the pallet (1) that causes the cargo to tilt toward the center, making it difficult for the cargo 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 wall portion (6) and the thick wall portion (5) in the portion corresponding to the fork insertion port (10) of the upper deck portion (2). (12).

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

The fourth aspect can be realized in combination with the third aspect. In the fourth aspect, the pallet (1) has a protrusion that protrudes downward and becomes a thick wall portion (5) in the middle 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 with a simple configuration.

The pallet (1) of the fifth aspect includes an upper deck portion (2) formed in a rectangular shape in plan view, a lower deck portion (3) formed in a rectangular shape in plan view, corner beams (41), It includes an intermediate spar (42) and a center spar (43). The corner beams (41) connect each corner of the upper deck part (2) and each corner of the lower deck part (3), respectively. The intermediate girder (42) connects the middle part of each side of the upper deck part (2) and the middle part of each side of the lower deck part (3), respectively. The center girder (43) connects the center portion of the upper deck portion (2) and the center portion of the lower deck portion (3), respectively. A fork insertion opening (10) is formed in the pallet (1) between the upper deck part (2) and the lower deck part (3) and between the corner girder (41) and the intermediate girder (42). be done. The pallet (1) has a part on the intermediate girder (42) side that has a bending rigidity higher than that of the corner girder (41) side in the part corresponding to the fork insertion port (10) of the upper deck part (2). has a low rigidity portion (8) with a low stiffness.

According to the fifth aspect, when a bending moment is applied to the low-rigidity portion (8) that lowers the portion on the intermediate girder (42) side due to the cargo loaded on the portion on the intermediate girder (42) side, the low-rigidity portion (8) It bends at the rigid part (8), and the part on the intermediate girder (42) side becomes lower and recessed downward. As a result, it becomes difficult for the pallet (1) to become convex upward and for the cargo to fall from the pallet (1).

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

Claims (7)

an upper deck portion formed in a rectangular shape in plan view and having an upper surface located on a flat surface ;
a lower deck portion formed in a rectangular shape in plan view;
Corner girders that connect each corner of the upper deck portion and each corner of the lower deck portion, respectively;
an intermediate girder that connects a middle part of each side of the upper deck part and a middle part of each side of the lower deck part;
a central girder that connects the central part of the upper deck part and the central part of the lower deck part,
A pallet in which a fork insertion opening is formed between the upper deck part and the lower deck part and between the corner girder and the intermediate girder,
In a portion of the upper deck portion corresponding to the fork insertion opening, a portion on the intermediate girder side has a thin portion that is thinner than a thick portion on the corner girder side. an upper deck portion formed in a rectangular shape in plan view and having an upper surface located on a flat surface ;
corner girders 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;
a central girder projecting downward from the central portion of the upper deck portion;
A pallet in which a fork insertion opening is formed between the corner girder and the intermediate girder,
In a portion of the upper deck portion corresponding to the fork insertion opening, a portion on the intermediate girder side has a thin portion that is thinner than a thick portion on the corner girder side. The pallet according to claim 1 or 2, further comprising a stepped portion between the thin wall portion and the thick wall portion in a portion of the upper deck portion corresponding to the fork insertion opening. The pallet according to claim 3, further comprising a protrusion that protrudes downward and becomes the thick wall portion at an intermediate portion of a portion of the upper deck portion corresponding to the fork insertion opening. an upper deck portion formed in a rectangular shape in plan view and having an upper surface located on a flat surface ;
a lower deck portion formed in a rectangular shape in plan view;
Corner girders that connect each corner of the upper deck portion and each corner of the lower deck portion, respectively;
an intermediate girder that connects a middle part of each side of the upper deck part and a middle part of each side of the lower deck part;
a central girder that connects the central part of the upper deck part and the central part of the lower deck part,
A pallet in which a fork insertion opening is formed between the upper deck part and the lower deck part and between the corner girder and the intermediate girder,
In a portion of the upper deck portion corresponding to the fork insertion opening, a portion on the intermediate girder side includes a low-rigidity portion having a lower bending rigidity than a portion on the corner girder side. an upper deck portion formed in a rectangular shape in plan view;
a lower deck portion formed in a rectangular shape in plan view;
Corner girders that connect each corner of the upper deck portion and each corner of the lower deck portion, respectively;
an intermediate girder that connects a middle part of each side of the upper deck part and a middle part of each side of the lower deck part;
a central girder that connects the central part of the upper deck part and the central part of the lower deck part,
A pallet in which a fork insertion opening is formed between the upper deck part and the lower deck part and between the corner girder and the intermediate girder,
In a portion of the upper deck portion corresponding to the fork insertion opening, a portion on the intermediate girder side has a thin portion that is thinner than a thick portion on the corner girder side;
A step portion is provided between the thin wall portion and the thick wall portion in a portion of the upper deck portion corresponding to the fork insertion port.
palette. an upper deck portion formed in a rectangular shape in plan view;
corner girders 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;
a central girder projecting downward from the central portion of the upper deck portion;
A pallet in which a fork insertion opening is formed between the corner girder and the intermediate girder,
In a portion of the upper deck portion corresponding to the fork insertion opening, a portion on the intermediate girder side has a thin portion that is thinner than a thick portion on the corner girder side;
A step portion is provided between the thin wall portion and the thick wall portion in a portion of the upper deck portion corresponding to the fork insertion port.
palette.

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