JP3412793B2 - Plastic pallets - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic pallet for a forklift used when storing and transporting a load, and more particularly to a high-strength plastic pallet with little bending.

[0002]

2. Description of the Related Art Conventionally, plastic pallets for storing and transporting luggage have been widely used due to their excellent corrosion resistance and stain resistance, but they have problems in bending strength and impact strength.
This kind of pallet connects the upper deck board and the lower deck board with the pillars of the hollow structure arranged at both ends and the middle, and the fork of the forklift is connected to the space surrounded by the pillars and the upper and lower deck boards. It is a fork slot for inserting. The lower surface of the upper deck board has a rib structure that runs in the vertical and horizontal directions in order to abut and weld the parts that have been previously divided and molded separately.

The above-mentioned plastic pallets are so-called rack-stacked, in which pedestals are supported at both ends of the pallets when loading and storing the pallets. 5 and 6 show an example of rack stacking. Four way pallet 1
The upper deck board 3 and the lower deck board 5 are connected by the pillar portions 7 at the four corners and the intermediate pillar portion 9 provided in the middle, and the space surrounded by the pillar portions and the upper and lower deck boards is used as a fork insertion port 10. The pedestals 11 are placed and supported on the lower surfaces of the pillars 7 at the four corners.

[0004]

In such rack stacking, when a load is placed on the pallet 1 and a load is applied in the direction of the arrow, the pallet as a whole is arcuate as shown by the alternate long and short dash line in FIG. Transforms into. The amount of this deformation is
The pillar wall facing the fork insertion port 9 of 9 is further deformed to become larger. That is, the upper deck board is formed by providing reinforcing ribs on the lower surface of the top plate, but when the load increases, it becomes impossible to maintain a right angle at the connecting portion between the pillar wall and the top plate, and this is shown by the one-dot chain line in FIG. like,
The pillar adjacent portion 13 of the top plate deforms the pillar upper portion 15 inward, while the pillar lower portion 17 is deformed outward (fork insertion port side) in the lower deck board. In this way, the top board of the deck board is deformed, so that the deck board and the column portion cannot maintain a right angle, and the amount of bending is further increased.

Since the plastic pallet is more slippery than the wooden pallet, not only can the luggage be placed in a stable state when the deck board bends, but also
This will cause the load to collapse. Further, since it is made of plastic, if the deformed state is maintained for a long time, there is a problem that permanent deformation occurs and the original state cannot be restored. The present invention has been made in view of the above circumstances, and provides a plastic pallet with a small amount of flexure of a deck board and capable of safely storing and transporting luggage.

[0006]

In order to achieve the above object, the present invention has the following constitution. That is, in the plastic pallet according to claim 1 of the present invention, parts that are split-molded upper parts are welded to each other on the end face of the column,
At least the upper deck board is a pallet consisting of a top plate and reinforcing ribs provided vertically and horizontally on the bottom surface of the top plate, and the top plate on the fork insertion side of the four corner support parts is thick with a constant width from the four corner support parts. The wall thickness T of the thick wall portion is 1.5 to 2 times the wall thickness t of the top plate, and the width L from the column portion is 1
In addition to 0 to 20 mm, the outer surface of the pillars at the four corners
Even if at least the upper part of one outer surface is in the same direction
Make it concave than the outer surface of the strut,
Fork locking part that locks the fork tip of the clift
It is characterized by being provided. The wall thickness of the thick portion is preferably, for example, 5 to 6.5 mm.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail. 1 is a front view of the pallet, FIG. 2 is a plan view of the right half of the pallet, and a left half is a cross-sectional view of the pallet taken along the line AA in FIG. 1. FIG. It is an expanded sectional view which abbreviate | omitted a part in -B line. The pallet 20 is the upper deck board 2
1 and the lower deck board 23 are connected by a pillar portion 25 at four corners and an intermediate pillar portion 27 provided in the middle thereof, and a fork is formed between the upper and lower deck boards 21, 23 and the pillar portion 25 and the pillar portion 27. It is a four-way insertion pallet having an insertion port 29. In the pallet, upper and lower parts, which have been separately formed in advance, are butted and welded to each other at a column portion, and the column portion has a hollow structure.

The upper deck board 21 comprises a top plate 30 and reinforcing ribs 31 provided vertically and horizontally on the lower surface of the top plate 30. Further, the lower deck board 23 is provided so as to be connected only between the pillars, and the portion surrounded by the pillars is an opening. The peripheral edge of the top plate 30 protrudes from the pillar portions 25 at the four corners, the intermediate pillar portions 27, and the side plates 33 that connect the pillar portions at the four corners and the intermediate pillar portions (see FIGS. 1 and 2). By thus projecting the peripheral edge of the top plate on the side surface of the pallet, the outer surface of the column does not come into contact with the ground and is not damaged when the pallet is stored and transported in a standing state.

Further, according to the present invention, in order to reduce the amount of deformation of the deck board, the connecting portion between the column portion and the top plate is reinforced. As shown in FIG. 3, a column wall 35 facing the fork insertion port 29 of each column 25, 27, and the column wall 35.
In the connecting portion of the top plate with and, a certain range on the fork insertion port 29 side is set as the thick portion 37. That is, the column 2
By increasing the thickness of the top plate in the vicinity of the side facing the fork insertion port 29 of 5, 27, the connection between the support column and the top plate is made strong and the deflection of the deck board is reduced. is there.

The thickness T of the thick portion 37 is the thickness t of the top plate.
1.5 to 2 times (5 to 6.5 mm), width L is 10 to 20
It is preferably mm. In this way, by forming the thick portion 37 at the connecting portion of the top plate with the support column, it is possible to prevent the top plate from bending and maintain a right angle with the support wall. If the bending of the top plate is prevented, the support wall is also prevented from being deformed, so that the amount of deformation of the entire deck board can be suppressed. The thick-walled portion 37 has a top plate on the side facing the fork insertion port 29, which is thicker than other portions in a certain range, in the connecting portion with the pillar portion, but on the opposite side, that is, a hollow pillar. Even on the inner side of the portion, the top plate may be the thick portion 37 in a certain range. In this case, the deformation of the deck board can be further reduced.

Further, in the above-described embodiment, in order to efficiently and safely load the truck onto the bed, the fork tip of the fork wrist is locked. As is apparent from FIG. 2, at least the upper portion of one outer surface 39 of the two outer surfaces of the four corners of the pillar portion 25 that intersect at right angles is formed to be recessed from the outer surface of the intermediate pillar portion 27. Thus , the edge of the top plate 30 is largely projected, and the lower surface of the projected top plate is used as the fork engaging portion 40.

The fork engaging portion 40 has an outer surface 3
Although 9 is used as a vertical surface to be recessed in the lower deck board 23, the outer surface 39 may be used as an inclined surface and recessed only in the lower surface of the upper deck board 21. Further, in the case of the inclined surface, it may be inclined from the lower end portion of the outer side surface 39 to the upper inside, but may be inclined from the middle portion of the outer side surface 39.

The fork locking portion 40 is used as follows. For example, when loading the pallet on the loading platform of the truck, the pallet is once placed on the loading platform, the fork is retracted, and then the fork is advanced to insert the tip of the fork into the fork locking portion 40. After the tip of the fork is locked to the fork locking portion 40, the fork is slightly pulled up to tilt the pallet. By inclining the pallet, the contact area with the bed is reduced and the frictional resistance is reduced, so that the pallet can be pushed and moved easily.

Although the four-way pallet has been described in the above embodiment, it may be a two-way pallet or a one-sided pallet. Further, it can be applied to a so-called skid pallet in which the lower deck board is omitted.

[0015]

Since the plastic pallet according to the present invention is reinforced by making the top plate on the fork insertion port side of the four corners of the column pallet thick, the deck pallet has a small bending and a large bending strength. You can get a pallet. Therefore, luggage can be stably stored and transported, and there is no risk of collapse of cargo. In addition, permanent deformation can be prevented. Further, since the fork engaging portions are provided on the outer surfaces of the column portions at the four corners, the loading work and the aligning work of the pallet on the truck by the forklift can be easily performed.

[Brief description of drawings]

FIG. 1 is a front view of a pallet.

2 is a plan view of a quarter of the pallet on the right half, and a cross-sectional view of a quarter of the pallet on the line AA of FIG. 1 on the left half.

FIG. 3 is an enlarged cross-sectional view with a part of line BB-B omitted.

FIG. 4 is an explanatory front view showing an example of stacking pallets on a rack.

FIG. 5 is an explanatory partial cross-sectional view showing deformation of pallets in rack stacking.

[Explanation of symbols]

20 pallets 21 Upper deck board 23 Lower deck board 25 Support 27 Middle support 29 Fork slot 30 Top plate 31 Reinforcing rib 33 Side plate 35 prop wall 37 Thick part 39 Outer side of the pillars at the four corners 40 Fork locking part

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliographic report Flat 1-69726 (JP, U) Actual flat 2-48542 (JP, U) Actual 64-23444 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) B65D 19/32

Claims (2)

(57) [Claims] 1. A pallet consisting of a top plate and reinforcing ribs vertically and horizontally provided on at least the upper deck board, which are welded together at the end faces of the pillars by split-molded upper parts and at the four corners. The top plate on the fork insertion port side of the strut is a thick wall portion continuous from the strut parts at the four corners, and the thickness T of the thick wall portion is 1.5 to 2 times the wall thickness t of the top plate. The width L from the section is 10 to 20 mm, and the four corners are supported.
At least the upper part of the outer surface of at least one of the outer surfaces of the pillar
The top of the top plate by denting the
Lock the fork tip of the forklift on the bottom side.
A plastic pallet characterized by having a fork locking part . 2. The thickness T of the thick portion is 5 to 6.5 mm.
The plastic pallet according to claim 1, wherein