JPH0939966A - Pallet made of synthetic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pallet wherein a distortion of the deck boards is small, and the bending strength is large by providing a thicker part which protrudes to the fork insertion side, and extends to the height of a reinforcing rib, at an area which faces the fork insertion port of a column wall of each column part to connect the upper deck board and the lower deck board. SOLUTION: At connected parts between respective column parts 25, 27a, 29a and upper and lower deck boards 21, 23, a thicker part 40 is formed on the sides facing a fork insertion port 30. The thicker part 40 protrudes to the fork insertion port 30 sides of a column wall 41 of the column part 25 at an area which faces the fork insertion port 30, a column wall 43 of the column part 27a at an area which faces the fork insertion port 30, and also, a column wall 45 of the column part 29a at an area which faces the fork insertion port 30, and is formed extending to the height of a reinforcing rib 35. For this reason, the bending strength of the column part itself is increased, and also, the strength of the deck board itself is improved because the thicker part 30 is formed by protruding to the fork insertion port 30 side, and an interval between respective column parts becomes narrower by the thicker parts 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin pallet for a forklift used for storing and transporting luggage, and more specifically, the strength of a connecting portion between a column and a deck board facing a fork insertion opening. The present invention relates to a pallet made of synthetic resin with improved performance.

[0002]

2. Description of the Related Art Generally, a pallet for a forklift, which is generally used for storing and transporting luggage, is made of a synthetic resin pallet. Most synthetic resin pallets connect the upper deck board and the lower deck board on both side edges and the middle of each with hollow pillars to form a space between the pillars and the space surrounded by the upper and lower deck boards. Use as a fork slot. In the synthetic resin pallet, the pillars are generally hollow structure whether they are integrally molded by an injection molding machine or when the parts that have been separately molded in advance are butt-welded together.

In actual use, for example, flat stacking,
It is used by a stacking method such as stacking or racking. In particular, stacking racks in which pedestals are placed on both ends of a pallet to support it has the following problems. 6 and 7 show an example of stacking on a rack. Four-way pallet 1 has upper deck board 3 and lower deck board 5
And a pillar portion 7 at four corners and an intermediate pillar portion 9 provided in the middle thereof
And the space surrounded by the pillars and the upper and lower deck boards is used as a fork insertion opening 10, and the pillars 7 at the four corners are attached to the base 1
Supported by 1.

[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 1 as a whole is bowed as shown by the alternate long and short dash line in FIG. This deformation amount causes the pillar wall 13 facing the fork insertion opening 10 of the pillar portion 7 to be deformed in a zigzag shape due to the distortion of the upper and lower deck boards 3 and 5, and the distortion of the deck board is further increased. When the upper and lower deck boards 3 and 5 are distorted downwards, the connecting portion 15 of the upper deck board 3 is connected to the supporting portion 15 at the supporting wall 13 of the supporting portion 7 where the deck boards are connected, as indicated by the alternate long and short dash line in FIG. 7 is deformed inward, and the connecting portion 17 of the lower deck board 5 is deformed outward of the pillar 7 (fork insertion port side).
Thus, the distortion amount of the deck board is further increased in combination with the deformation of the strut wall 13 of the strut portion 7.

When the deck board is distorted, not only the luggage cannot be placed in a stable state, but also the cargo may collapse. Further, if the strained state is maintained for a long time, there is a problem that the pallet is permanently deformed. Therefore,
There has been a demand for a synthetic resin pallet that has a small amount of distortion of the deck board, does not increase the cost, and can safely store and transport luggage.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a robust synthetic resin pallet with a small amount of deformation of a deck board.

[0007]

To achieve the above object, a synthetic resin pallet according to claim 1 of the present invention comprises:
In a pallet in which the upper deck board and the lower deck board are connected by a pillar portion having a hollow structure, and a gap surrounded by the pillar portion and the upper and lower deck boards is a fork insertion port, a loading surface of the upper deck board and the lower deck board Each surface is made smooth, and reinforcing ribs parallel to the side surface of the pallet are provided on the inner side surface, and the reinforcing ribs protruding toward the fork insertion port side are formed on the column walls of the part facing the fork insertion port of each column part. It is characterized in that a thick portion extending over the height of is projected. Further, the synthetic resin pallet according to claim 2 is characterized in that the thick portion is provided so as to project so that the total thickness of the thick wall portion and the support wall is within 15 mm. Further, in the synthetic resin pallet according to claim 3, at least one of the upper deck board and the lower deck board has a gradually decreasing height toward the outside, and the inside tip portion is fork-inserted. Intersects with the tip of the reinforcing rib in the same direction,
It is characterized in that an inclined rib inclined to the side surface of the pallet is provided.

[0008]

Therefore, according to the first aspect of the present invention, the thick portion projecting from the pillar wall at the connecting portion between the upper deck board and the lower deck board prevents deformation of the pillar wall and improves bending strength. Work to let. In the second aspect, by limiting the overall wall thickness, problems such as molding time and deformation due to shrinkage do not occur. Further, according to the third aspect, the inclined ribs are connected to the reinforcing ribs in the same direction as the fork insertion direction to prevent damage due to collision of the forks.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail with reference to the drawings. 1 to 5 show an embodiment of the present invention. FIG. 1 is a plan view of a half of a pallet, and FIG.
Is a front view of a half of the pallet, FIG. 3 is a vertical sectional view of the left half taken along the line AA of FIG. 1, FIG. 4 is a sectional view of the half of the pallet taken along the line BB of FIG. 2, and FIG. It is a partially enlarged view. The pallet 20 has an upper deck board 21 and a lower deck board 23, which are formed by supporting pillars 25 at four corners and intermediate supporting pillars 27a and 27b formed by dividing the upper deck board 21 into two, and a central supporting pillar 29a formed by dividing the center into four. 29b, and the upper and lower deck boards 21, 23 and the pillars 25, 2
It is a four-way insertion pallet having a fork insertion opening 30 in the space surrounded by 7a and the support columns 25 and 27b. A space 31 is provided between the intermediate support columns 27a and 27b, and a cross-shaped space 33 is provided between the center support columns 29a and 29b.

The space 31 and the space 33 face each other,
Therefore, one side of the pallet facing the other side communicates with the side of the other side. These voids 31 and 33 are used as through holes for the band. Synthetic resin pallets have the disadvantage that they have a small friction coefficient and are slippery due to the inherent properties of synthetic resins.Therefore, it is possible to bind the load and the pallet together with a band to prevent the load from collapsing and ensure the safety of transportation work. is there. By providing the gaps 31 and 33, it is possible to integrally bind the load without inserting the band into the fork insertion port 30 when the band is hooked. The band can be hung vertically and horizontally by dividing the central column into four and providing the cross-shaped void 33.

The upper deck board 21 and the lower deck board 23 have smooth surfaces, which serve as loading surfaces, and reinforcing ribs 3 parallel to the side surfaces of the pallet on the inner surface.
5 are provided. A drain hole 37 is formed in a portion surrounded by the reinforcing rib 35. Further, in the illustrated embodiment, the upper and lower deck boards 21 and 23 facing the fork insertion opening 30 are also provided with band engaging recesses 34. The band hanging recess 34 is a side recess 34.
a and an inner surface recessed portion 34b continuous with the side surface recessed portion 34a, the pillar portions 25 at the four corners and the intermediate pillar portions 27a and 27b.
Are formed adjacent to each other. The side surface recessed portion 34a is formed by recessing the side end surface of the deck board, and the inner surface recessed portion 34b is formed by recessing the reinforcing rib 35 between the support columns with the same width as the side surface recessed portion 34a. The width and depth of the band-hanging concave portion 34 can be appropriately determined depending on the load and the type of band used. In this embodiment, since the band hanging concave portion 34 is formed adjacent to the supporting column portion,
The supporting part can bear the load caused by the banding.

Further, inclined ribs 39 which are inclined with respect to the side surface of the pallet in a plane are provided at the edge portions of the fork insertion openings 30 of the upper and lower deck boards 21, 23. The inclined ribs 39 are formed to have a lower height toward the outside in order to facilitate the insertion of the forks, and the inner tip portions are formed so as to intersect the tip portions of the reinforcing ribs 35 in the same direction as the fork insertion direction. (See FIG. 4). That is, since the inclined rib 39 is provided obliquely with respect to the inserting direction of the fork, the impact applied to the inclined rib 39 is transmitted to and absorbed by the reinforcing rib 35 in the same direction as the fork inserting direction. ing. In this way, the reinforcing ribs 35 in the same direction as the fork insertion direction and the inclined ribs 39 whose intersections coincide with the edges of the deck board
By providing the, it is possible to prevent damage due to collision of the fork.

Further, according to the present invention, the support columns 25 and 27 are provided.
a, 27b, 29a and 29b and upper and lower deck boards 2
One of the features is that the thick portion 40 is formed on the side facing the fork insertion opening 30 in the connection portion with the first and the second portions 23. That is, the thick-walled portion 40 includes the pillar wall 41 and the pillar portions 27 a and 27 of the pillar portion 25 facing the fork insertion opening 30.
b of the support wall 43 of the portion facing the fork insertion opening 30 of b, and further projecting to the fork insertion opening 30 side of the support wall 45 of the portions of the support pillars 29a and 29b facing the fork insertion opening 30,
It is formed over the height of the reinforcing ribs 35 (see FIG.
(See FIG. 5). Deformation of the deck board due to the load of the load is increased not only by the deformation of the deck board itself but also by the deformation of the pillar wall of the pillar part to which the deck board is connected. It aims to suppress the amount of deformation of the deck board.

By forming the thick wall portion 40 at the connecting portion of the pillar wall facing the fork insertion port with the deck board, not only the bending strength of the pillar portion itself is increased, but also the thick wall portion 40.
Is formed so as to project toward the fork insertion opening 30 side, the intervals between the respective pillars are narrowed accordingly, and the strength of the deck board itself is improved. That is, since the bending strength is affected by the length of the deck board, it is intended to increase the bending strength by shortening the length of the deck board by the thick portion. Since the thick portion 40 is formed over the height of the reinforcing ribs 35 of the deck board, the size of the fork insertion port 30 does not change and does not affect the fork work. The protruding thickness of the thick portion 40 is 1 to 10 m.
m, and the total thickness of the wall of the support column is determined to be within 15 mm.

Although the four-way pallet has been described in the above embodiment, it may be a two-way pallet or a pallet for one side use. Further, the present invention can be applied to a so-called skid pallet in which the lower deck board is omitted. Moreover, you may attach the grommet for slip prevention to the appropriate part of the deck board. As the synthetic resin for a pallet having the above structure, all conventionally known thermoplastic synthetic resins are used, and examples thereof include polypropylene, polyethylene, polystyrene (PS), polycarbonate and the like (PC).

[0016]

As described above, in the synthetic resin pallet according to the first aspect of the present invention, the reinforcing ribs protruding toward the fork insertion port side are formed on the column walls of the respective column parts facing the fork insertion port. Since the thick portion extending over the height is projected, the pallet with little bending of the deck board and large bending strength can be obtained. In the synthetic resin pallet according to claim 2, the thick portion has a total thickness of 1 with the pillar wall.
Since it is within 5 mm, without changing the molding conditions,
It can be molded like a conventional pallet. Also,
In the synthetic resin pallet according to claim 3, the height gradually decreases toward the outside, the inner tip portion intersects with the tip portion of the reinforcing rib in the same direction as the fork insertion direction, and is inclined with respect to the side surface of the pallet. Since the inclined ribs are provided on the end edge portion of the deck board, it is possible to obtain a robust pallet that is not damaged even when the fork collides.

[Brief description of drawings]

FIG. 1 is a plan view of the right half of a pallet.

FIG. 2 is likewise a front view of the right half.

3 is a vertical cross-sectional view of half of the pallet taken along the line AA in FIG.

FIG. 4 is a sectional view taken along line BB in FIG.

5 is a partially enlarged view of FIG.

FIG. 6 is an explanatory front view showing an example of rack stacking of pallets.

FIG. 7 is an explanatory sectional view showing deformation of pallets in rack stacking.

[Explanation of symbols]

20 Pallet 21 Upper Deck Board 23 Lower Deck Board 25 Four Corner Posts 27a Intermediate Posts 27b Intermediate Posts 29a Central Posts 29b Central Posts 30 Fork Inserts 31 Voids 33 Cross-shaped Voids 34 Banding Ditches 35 Reinforcing Ribs 37 Water Draw hole 39 Inclined rib 40 Thick wall 41 Column wall of part of four corner column facing fork insertion port 43 Column wall of part of intermediate column that faces fork insertion port 45 Face fork insertion port of intermediate column Part of the pillar wall

Claims (3)

[Claims] 1. A pallet in which an upper deck board and a lower deck board are connected by a pillar portion having a hollow structure, and a gap surrounded by the pillar portion and the upper and lower deck boards is a fork insertion port, and the upper deck board and the lower deck board are connected to each other. The deck board loading surface is made smooth, and reinforcing ribs parallel to the side of the pallet are provided on the inner surface, and the fork insertion port is attached to the column wall facing the fork insertion port of each column section. A pallet made of synthetic resin, characterized in that a thick-walled portion protruding to the side and extending over the height of the reinforcing rib is provided in a protruding manner. 2. The thick portion has a total thickness of 1 with a pillar wall.
The synthetic resin pallet according to claim 1, wherein the pallet is provided so as to project within 5 mm. 3. An edge of at least one of the upper deck board and the lower deck board has a height that gradually decreases toward the outside, and an inside tip portion of the reinforcing rib in the same direction as the fork insertion direction. The synthetic resin pallet according to claim 1 or 2, wherein an inclined rib that intersects with the tip portion and is inclined with respect to the side surface of the pallet is provided.