JP3847501B2 - Plastic pallet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a synthetic resin pallet for forklifts used for storing and transporting luggage, and more particularly to a lightweight and robust synthetic resin pallet in which a portion connected to a column portion of a deck board is reinforced.
[0002]
[Prior art]
Most of the pallets used for storing and transporting luggage are pallets made of synthetic resin. A synthetic resin pallet is excellent in corrosion resistance and contamination resistance, but has a problem that it is inferior in bending strength and impact strength compared with a wooden pallet. The synthetic resin pallet connects the upper deck board and lower deck board with support columns with a hollow structure arranged at both ends and the middle part, and the space surrounded by the support columns and the upper and lower deck boards is connected to the fork of the forklift. It is an insertion slot.
[0003]
The manufacturing method includes a method of integrally injection-molding and a method of integrally welding and molding a part that is divided into a plurality of parts. In one manufacturing method in which the fusion molding is performed integrally, the pallet is divided and molded into upper and lower parts in the middle of the pillar parts in advance, and the pillar parts of these parts are butted and welded together. The pallet by butt welding has a hollow structure in which reinforcing ribs are provided on the lower surface of the deck board and the upper and lower surfaces and side surfaces are closed.
[0004]
[Problems to be solved by the invention]
When pallets are loaded and stored, so-called rack stacking is performed in which pallets are placed on both ends of the pallet and supported. In such rack stacking, when a load is applied to the pallet by the loaded cargo, both ends are supported by pedestals, but the central part is a floating body, so the central part of the pallet as a whole is Deforms into a bow. Also, when transported by a chain conveyor, there is a problem that the deck board is deformed when stress is applied to the lower deck board.
[0005]
In particular, the upper deck board is formed with vertical and horizontal reinforcing ribs on the lower surface of the top plate. However, when the load increases, it becomes impossible to maintain a right angle at the connecting portion between the column wall and the top plate, and the amount of deflection is further increased. It will be. Since the synthetic resin pallet is more slippery than the wooden pallet, if the deck board bends, not only can the luggage be placed in a stable state, but it also causes collapse of the load. Moreover, since it is made of a synthetic resin, there is a problem that if the deformed state continues for a long time, permanent distortion occurs and the original state cannot be restored.
[0006]
In addition, a large opening is provided on the lower surface of the pallet to enable the use of a hand lift (manual small forklift) or a pallet truck. That is, the lower deck board of the portion connecting the support columns is left, and the portion surrounded by the lower deck board is cut out to make a relatively large opening. Providing a large opening on the lower surface of the pallet reduces the strength of the pallet as a whole.
[0007]
Moreover, when using a handlift, if the height of a lower deck board is made low, insertion of a handlift will become easy and the conveyance work by a handlift can be performed efficiently. Therefore, it is desirable that the height of the lower deck board be as low as possible in order to facilitate insertion of the handlift. However, simply lowering the height of the lower deck board decreases the strength of the lower deck board, which in turn decreases the strength of the entire pallet.
[0008]
Therefore, in the pallet made of synthetic resin, it is desired to develop a pallet having high bending strength as well as light weight. The present invention provides a synthetic resin pallet in which the strength of the entire pallet is improved by efficiently reinforcing the reinforcing ribs on the bottom surface of the deck board to reduce the deformation of the connecting portion between the column wall and the top plate. With the goal.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is configured as follows. In other words, the synthetic resin pallet according to the present invention connects the upper deck board and the lower deck board with the support column, and the reinforcing rib in the same direction as the insertion direction of the fork and the reinforcing rib substantially parallel to the side surface on the lower surface of the deck board. A pallet provided with ribs, at least in the upper deck board, among the reinforcing ribs substantially parallel to the side surfaces, a build-up portion is provided on a side surface within a certain range from the column portion of the reinforcing rib connected to the column portion, and the meat The lower surface of the raised portion is inclined downward toward the support portion, and the portion connected to the support portion is connected to the support portion below the lower surface of the reinforcing rib . It is preferable that the build-up portions are provided on both side surfaces of the plurality of reinforcing ribs that connect the column portions. And although the thickness of a build-up part is not specifically limited, For example, thickness can be 0.3-2.0 mm. Further, in the lower deck board, among the reinforcing ribs substantially parallel to the side surface, a built-up portion is provided on a side surface within a certain range from the supporting rib portion of the reinforcing rib connected to the supporting column portion, and the lower surface of the built-up portion faces the supporting column portion. May be inclined downward.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments illustrated in the drawings. The pallet shown in the figure is a four-way pallet in which an upper deck board and a lower deck board are connected by supporting portions at four corners and supporting portions provided in the middle. The pallet 10 is formed by connecting an upper deck board 11 and a lower deck board 13 with support sections 15 at four corners, an intermediate support section 17 provided in the middle, and a central support section 19 at the center. This is a four-way pallet in which the gap surrounded by the support column 15 and the support column 17 is a fork insertion port 20.
[0011]
The pallet 10 is divided in advance in the horizontal direction at a substantially central portion of each support column, and is formed into an upper part 21 having an upper deck board and a lower part 23 having a lower deck board. The parts 23 and the parts 23 are integrally molded by being butted and welded at the support columns. Reinforcing ribs are provided vertically and horizontally on the lower surface (inner surface) of the upper deck board 11 and the lower surface (outer surface) of the lower deck board 13, and each column portion has a hollow structure.
[0012]
The upper deck board 11 includes a top plate 25 and reinforcing ribs 27 provided vertically and horizontally on the lower surface of the top plate 25. The reinforcing ribs 27 are formed vertically and horizontally by reinforcing ribs 27a provided substantially parallel to the side surface of the pallet and reinforcing ribs 27b provided substantially parallel to the insertion direction of the fork. Further, in order to reduce the deformation amount of the deck board, a built-up portion 29 is provided on the side surface of the portion of the reinforcing rib 27a that is parallel to the side surface and that is connected to each of the column portions 15, 17, and 19.
[0013]
As shown in FIGS. 2 and 4, the built-up portion 29 has a lower surface that is a tapered surface or a rounded surface and is inclined downward toward the wall surface of the column, and even when the lower surface is a tapered surface, In the connecting portion, the lower surface is connected as a rounded surface 29a. Further, the build-up portion 29 has a thickness of 0.3 to 2.0 mm, preferably 0.8 to 1.2 mm, and is provided on one or both sides of the reinforcing rib 27a.
[0014]
In order to prevent the deformation of the deck board, the entire top plate and / or reinforcing ribs may be formed thick, but the weight of the pallet itself increases and the cost increases. Therefore, in order to effectively prevent the deformation of the upper deck board 11, the connecting portion between the deck board and the column portion, which are easily subjected to concentrated stress, is reinforced, and among the reinforcing ribs 27 a substantially parallel to the side surface of the pallet, the column In the portion connected to the portion, a build-up portion 29 whose lower surface is inclined downward toward the support column portion is provided.
[0015]
In this manner, the upper deck board 11 is prevented from being deformed by forming the built-up portion 29 in the portion connected to the support column, and the entire pallet is also prevented from being deformed by maintaining a right angle with the support column. The size of the built-up portion 29 may be determined according to the size, use, material, etc. of the pallet.
[0016]
In addition, the build-up portion 29 is formed in a substantially triangular shape as in the above embodiment, and as shown in FIG. 5 (a), the upper tip portion is a reinforcing rib 27b in the same direction as the fork insertion direction. It may be formed in a substantially trapezoidal shape. In addition, as shown in FIG. 5B, the build-up portion 29 is not limited to a range defined by the support ribs and the reinforcing ribs 27b adjacent to the support columns, and the reinforcing ribs 27b adjacent to the support columns are not limited. You may form continuously on both sides.
[0017]
In the lower part 23, the lower deck board 13 is provided in a beam shape so as to connect the support columns, and a portion surrounded by the lower deck boards is a large opening 30. Thus, the use of the hand lift becomes possible by providing the opening 30. The lower deck board 13 has an upper surface (inner side surface) as a substantially smooth curved surface toward the fork insertion direction in order to facilitate insertion of the hand lift. The lower deck board 13 includes a lower plate 31 and reinforcing ribs 33 provided vertically and horizontally on the lower surface of the lower plate 31.
[0018]
The reinforcing ribs 33 are formed vertically and horizontally by reinforcing ribs 33a provided substantially parallel to the side surface of the pallet and reinforcing ribs 33b provided substantially parallel to the insertion direction of the fork. Further, in order to reduce the deformation amount of the deck board, the built-up portion 35 is provided on the side surface of the portion connected to each of the column portions 15, 17, 19 of the reinforcing rib 33a parallel to the side surface.
[0019]
The configuration of the build-up portion 35 can be formed in the same manner as the build-up portion 29. Therefore, the description is omitted to avoid duplication. As described above, also in the lower deck board, when the build-up portion 35 is formed on the reinforcing rib in the portion in contact with the support column, the deformation of the lower deck board can be suppressed to a small extent, coupled with the prevention of the deformation of the upper deck board. The deformation amount of the pallet as a whole can be further reduced.
[0020]
If the deformation of the lower deck board 13 is prevented, the height of the lower deck board can be lowered accordingly, and the height of the fork insertion port can be increased by the amount of lowering the lower deck board. Therefore, the effect that the insertion of the hand lift becomes easy is also obtained.
[0021]
In the above-described embodiment, the four-way pallet has been described. However, a two-way pallet may be used, and the present invention can also be applied to a double-sided pallet. It can also be applied to a so-called skid pallet in which the lower deck board is omitted.
[0022]
【The invention's effect】
The synthetic resin pallet according to the present invention is such that, in the reinforcing ribs of the deck board, among the reinforcing ribs parallel to the side surface of the pallet, the build-up part is formed in the part connected to the column part, so the deck board is less bent, A pallet with high bending strength can be obtained. Moreover, since the lower surface of the build-up portion is an inclined surface that inclines downward toward the support column, the connecting portion with the support column can be efficiently reinforced, and a lightweight pallet can be obtained as a whole. .
[Brief description of the drawings]
FIG. 1 shows a half of a pallet, a left half is a plan view, and a right half is a bottom view of an upper deck board.
FIG. 2 is a front view of the right half of the pallet in cross section.
FIG. 3 is a bottom view of a lower deck board showing corners.
FIG. 4 is an explanatory enlarged perspective view showing a built-up portion of a reinforcing rib.
FIG. 5 is a front view showing another embodiment of the built-up portion.
[Explanation of symbols]
10: Pallet 11: Upper deck board 13: Lower deck board 15: Four columns 17: Intermediate column 19: Center column 20: Fork insertion port 21: Upper component 23: Lower component 25: Top plate 27: Reinforcement Rib 27a: Reinforcement rib 27b parallel to the side surface: Reinforcement rib 29 in the fork insertion direction 29: Overlaying portion 29a: Round surface 30: Opening 31: Lower plate 33: Reinforcement rib 33a: Reinforcement rib 33b parallel to the side surface: Fork insertion direction Reinforcement ribs 35: meat overlay

Claims (4)

An upper deck board and a lower deck board connected by struts, a pallet substantially provided in the same direction reinforcing ribs substantially parallel to the reinforcing ribs and fork insertion direction and the side surface on the lower surface of the deck board, at least the upper In the deck board, among the reinforcing ribs substantially parallel to the side surface, a built-up portion is provided on a side surface within a certain range from the supporting rib portion of the reinforcing rib connected to the supporting column portion, and the lower surface of the built-up portion is directed downward toward the supporting column portion. A synthetic resin pallet characterized by being inclined and connected to the column part below the lower surface of the reinforcing rib . 3. The synthetic resin pallet according to claim 1 , wherein the build-up portions are provided on both side surfaces of a plurality of reinforcing ribs that connect between the support column portions . The synthetic resin pallet according to claim 1 or 2, wherein a thickness of the build-up portion is 0.3 to 2.0 mm . In the lower deck board, among the reinforcing ribs substantially parallel to the side surface, a built-up portion is provided on a side surface within a certain range from the supporting rib portion of the reinforcing rib connected to the supporting column portion, and the lower surface of the built-up portion is directed downward toward the supporting column portion. The synthetic resin pallet according to any one of claims 1 to 3, wherein the pallet is made to incline .

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