JP2001261039A - Synthetic resin pallet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve efficiency in manufacturing a synthetic resin pallet with cooling efficiency improved on molding the pallet by injection molding, and to prevent sinks from occurring at the time of cooling. SOLUTION: For the synthetic resin pallet comprising an upper skid S1 and a lower skid S2 which are integrally made of synthetic resin respectively as a half-finished product and being made up by welding both of the skids with tube-like girders, the front ends respectively at the outer circumferential walls of the girders 10, 20 and 30, partition walls 7, and inner ribs 12 of the girders are formed in the thickness of 3.5 mm or below, and the distance between each of the partition walls or between each of the inner ribs are set at 25 mm to 35 mm.

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, and more particularly, to a synthetic resin formed by welding an upper skid and a lower skid, each of which is a semi-finished product formed integrally, at a girder portion. The present invention relates to a synthetic resin pallet to be used.

[0002]

2. Description of the Related Art As an example, as shown in FIGS. 4 to 8, corner girder portions 1a 'formed at four corners and corner girder portions 1a are shown.
a top skid S1 having a square planar shape having an intermediate girder portion 1b 'formed in the middle of a' and a central girder portion 1c 'formed at the center portion, and similarly, corner girder formed at four corners Part 1a "and intermediate girder part 1 formed between corner girder part 1a"
b ″ and a lower skid S2 having a central girder 1c ″ formed at the center are integrally formed of synthetic resin, respectively, and the end face of the corner girder 1a ′ of the upper skid S1 and the intermediate girder Welding the end face of 1b 'and the end face of the center girder 1c' to the end face of the corner girder 1a ", the end face of the middle girder 1b" and the end face of the center girder 1c "of the lower skid S2, respectively. Is known.

[0003] The synthetic resin pallet formed as described above comprises an upper deck board 2 and a lower deck board 3.
And a cylindrical intermediate girder composed of corner girder portions 1a 'and 1a "formed at the four corners, and a cylindrical intermediate girder composed of intermediate girder portions 1b' and 1b" formed between the corner girder 1a. 1b and a cylindrical central girder comprising central girder portions 1c 'and 1c ", and a forklift forklift is provided between the corner girder 1a and the intermediate girder 1b and between the intermediate girder 1b and the central girder. A fork insertion hole 4 is formed to allow the corner girder 1a "and the middle girder 1b" and the middle girder 1b "and the center girder 1c 'of the lower skid S2 to be connected. An opening 6 is formed in the lower skid S2 other than the portion 5.

As described above, the end face of the corner girder 1a 'of the upper skid S1, the end face of the middle girder 1b' and the center girder 1
In order to weld the end face of c ′, the end face of the corner girder part 1a ″, the end face of the middle girder part 1b ″ and the end face of the center girder part 1c ″ of the lower skid S2, for example, FIG.
As shown as corner girder 1a "of lower skid S2, corner girder 1a ', 1a", middle girder 1b', 1b ".
And the thickness t1 'of the central girder 1c', 1c "is set large. For example, in the case of a foamed synthetic resin, 8 to 1 is used.
It is about 2 mm.
It is about 6 mm. In this way, by increasing the thickness of the girder portion, when welding the upper skid S1 and the lower skid S2, the girder portions 1a ', 1b of the upper skid S1 are welded.
b ′, 1c ′ end face, and girder part 1 of lower skid S2
Even if the end faces of a ", 1b", and 1c "are slightly displaced, the end faces of the girder parts 1a ', 1b', and 1c 'of the upper skid S1 and the girder parts 1a", 1b ", and 1c" of the lower skid S2 are different. It is configured such that a part of the end face abuts and can be welded. Further, when appropriate partition walls 7 are formed in the girder portions 1a ', 1b', 1c 'of the upper skid S1 and the girder portions 1a ", 1b", 1c "of the lower skid S2, 7 is also formed thick as described above.

[0005]

As described above, the upper skid S1, which is a semi-finished product of the conventional synthetic resin pallet, is used.
And the beam portions 1a ', 1a ", 1b', 1 of the lower skid S2.
Since the thickness of b ″, 1c ′, 1c ″, etc. is large, the cooling efficiency in molding the upper skid S1 and the lower skid S2 by injection molding is poor, and the cooling time is long. There was a problem that the manufacturing efficiency was poor.

[0006] Further, the beam portion 1 of the upper skid S1 and the lower skid S2, which are semi-finished products of the conventional synthetic resin pallet, are provided.
Since the thicknesses of a ', 1a ", 1b', 1b", 1c ', and 1c "are large, there is a problem that the synthetic resin pallet becomes heavy.

An object of the present invention is to solve the problems of the above-described conventional synthetic resin pallets.

[0008]

According to the present invention, in order to achieve the above-mentioned object, an upper skid and a lower skid, each of which is a semi-finished product made of synthetic resin, are integrally formed.
In a synthetic resin pallet formed by welding at the cylindrical girder, the outer peripheral wall of the girder, the partition wall, and the rib at the tip of each of the ribs inside the girder are set to 3.5 mm or less, and the partition wall or The spacing between the ribs in the girder is 25mm to 35m
m.

[0009]

Embodiments of the present invention will be described below, but the present invention is not limited to these embodiments unless it departs from the gist of the present invention. In addition, the synthetic resin pallet of the present invention is also similar to the conventional synthetic resin pallet described above in that the end faces of the corner girder part of the upper skid, the end faces of the middle girder part and the center girder part, and the corner girder of the lower skid girder. The end face of the part, the end face of the middle girder part and the end face of the center girder part are formed by welding each other, and only the structure of the girder part is different, so for the same constituent members, The reference numerals used in the above-mentioned conventional synthetic resin pallets are used.

The girder shown in FIG. 1 is a corner girder 10 of the lower skid S2 of the present invention corresponding to the corner girder 1a "of the conventional lower skid S2 described above. Are formed with partition walls 7a, 7b substantially parallel to outer side walls 10a, 10b forming the corner girder portion 10.
a, 7b, the inside of the corner girder part 10 has four compartments 11a,
11b, 11c and 11d. Further, the compartment 11c is formed by a partition wall 7c substantially parallel to the side wall (hereinafter, simply referred to as a fork insertion hole side wall) 10c and 10d on the side of the fork insertion hole 5 forming the corner girder portion 10.
It is divided into two compartments 11c 'and 11c ".

The outer side walls 10a and 10b and the side wall 1 on the fork insertion hole side which constitute the outer peripheral wall of the corner girder 10 described above.
The thickness t1 of each of the corner girder portions 0c and 10d is formed to be thinner than the thickness of the conventional corner girder portion 1a ″.
The thickness at the tip of 0 is 3.5 mm or less. Similarly, the wall thickness t2 of each of the partition walls 7a, 7b, 7c is formed to be 3.5 mm or less at the tip.

12a is one outer side wall 10a, and the fork insertion hole side wall 10 facing the outer side wall 10a.
c and a substantially U-shaped rib in the girder formed perpendicular to the bottom surface 13 of the corner girder 1a ″.
It is formed. 12b is the other outer side wall 1
0b, a substantially U-shaped spar inner rib similar to the above-mentioned rib 12a, which is formed perpendicular to the fork insertion hole side wall 10d facing the outer side wall 10b and the bottom surface 13 of the corner spar 1a ″. The thickness t3 of the in-spar ribs 12a, 12b is also determined at the tip thereof by the outer peripheral wall 10a of the corner girder 10 described above.
Like 10b, 10c, 10d and the partition walls 7a, 7b, 7c, they are formed to be 3.5 mm or less.

As described above, the outer peripheral wall 10 of the corner girder 10
a, 10b, 10c, 10d, partition walls 7a, 7b, 7c
And the thicknesses t1, t2, t3 of the ribs 12a, 12b in the girder.
Is formed at a tip of 3.5 mm or less, thereby improving the cooling efficiency at the time of molding by injection molding, thus improving the production efficiency of the synthetic resin pallet P and increasing the thickness. In addition, sink marks generated during cooling can be prevented. Further, the weight of the manufactured synthetic resin pallet can be reduced.

One outer side wall 10a and the outer side wall 10a
The spacing between the in-spar ribs 12a and the partition walls 7b and 7c arranged between the fork insertion hole side wall 10c and the fork insertion hole side wall 10c, which is formed at substantially equal intervals, is in the range of 25 mm to 35 mm. Outer side wall 10b and outer side wall 1
The spacing between the in-spar ribs 12b and the partition wall 7a disposed between the fork insertion hole side wall 10d and the fork insertion hole side wall 10b, which is opposite to 0b, is also formed at an equal interval and is 25 mm to 35 mm.
By forming at such intervals, the upper skid S
1 and the lower skid S2 can be increased in welding strength. Note that the corner girder of the upper skid S1 has the same configuration, and a description thereof will be omitted.

The girder shown in FIG. 2 is an intermediate girder 20 of the lower skid S2 of the present invention corresponding to the intermediate girder 1b ″ of the above-described conventional lower skid S2.
0, the outer side wall 2 forming the outer peripheral wall of the intermediate girder portion 20
0a and a partition wall 7d substantially parallel to the inner side wall 20b, and a partition wall 7e intersecting with the partition wall 7d are formed.
1a, 21b, 21c and 21d. Further, ribs 12c, 12d similar to the ribs 12a, 12b described above are formed. Outer peripheral wall of intermediate girder part 20, partition walls 7d and 7e, and girder ribs 12c and 12d
The thickness of the outer peripheral walls 10a, 10
b, 10c, 10d, the partition walls 7a, 7b, 7c and the thicknesses t1, t2, t3 of the in-spar ribs 12a, 12b,
At its tip, it is 3.5 mm or less.
Similarly, the intervals between the in-spar ribs 12c and 12d and the partition walls 7d and 7e are also equally spaced and are formed at 25 mm to 35 mm. The intermediate girder portion of the upper skid S1 has the same configuration, and a description thereof will be omitted.

The girder shown in FIG. 3 is the center girder 30 of the lower skid S2 of the present invention corresponding to the center girder 1c "of the conventional lower skid S2 described above.
0, a side wall 30a that forms the outer peripheral wall of the central girder 30
A partition wall 7f substantially parallel to one of the opposed side walls 30a,
A partition wall 7g intersecting with the partition wall 7f is formed.
The inside of the central girder 30 is divided into four compartments 31a, 31b, 31c, 31d by the partition walls 7f, 7g.
In-girder ribs 12e and 12f similar to the above-described in-girder ribs 12a and 12b are formed. Central girder 30
Outer peripheral wall, partition walls 7f, 7g and girder ribs 12e, 12
The thickness of f is determined by the outer peripheral walls 10a, 10a of the corner girder 10 described above.
b, 10c, 10d, the partition walls 7a, 7b, 7c and the thicknesses t1, t2, t3 of the in-spar ribs 12a, 12b,
At its tip, it is 3.5 mm or less.
Similarly, the intervals between the in-spar ribs 12e and 12f and the partition walls 7f and 7g are equally spaced and are formed at 25 mm to 35 mm. Note that the central girder portion of the upper skid S1 has the same configuration, and a description thereof will be omitted.

The lower skid S2 having the corner girder 10, the middle girder 20 and the center girder 30 having the above-described structure, and the upper skid S1 having the same corner girder, middle girder and center girder, are conventionally used. The thickness is thinner than that of the pallet, so the cooling efficiency when molding by injection molding is improved, and therefore, the production efficiency of the synthetic resin pallet is improved, and the sink generated during cooling can be prevented. it can.

Further, since the thickness of each of the outer peripheral walls of the girder portions 10, 20, and 30, the partition walls 7a to 7g, and the tip ends of the ribs 12a to 12f in the girder are configured to be 3.5 mm or less, the manufacturing is performed. Thus, the weight of the synthetic resin pallet can be reduced. For example, the size of a synthetic resin pallet formed by welding the upper skid S1 and the lower skid S2 is 1000 mm wide × 1200 mm long ×
When the synthetic resin pallet having a height of 125 mm has the configuration of the present invention, it weighs about 14 kg, whereas the conventional synthetic resin pallet weighs about 17 kg. About 1
The difference between the weight of 4 kg and the weight of about 17 kg is a significant difference when considering the workability of the synthetic resin pallet by hand. In other words, when the weight of the synthetic resin pallet is 15 kg or less, the worker can carry it alone. However, when the weight is 17 kg, two workers are required for carrying in consideration of working conditions. Required.

Further, even if the thickness of each of the outer peripheral walls of the girder portions 10, 20, and 30, the partition walls 7a to 7g, and the tip ends of the ribs 12a to 12f in the girder are set to 3.5 mm or less, the partition wall and the girder can be used. Since the intervals between the ribs are set to 25 mm to 35 mm at equal intervals, the welding strength between the upper skid S1 and the lower skid S2 is not reduced.

[0020]

Since the present invention has the above-described structure, the following effects can be obtained.

[0021] The cooling efficiency at the time of molding by injection molding is improved, and therefore, the production efficiency of the synthetic resin pallet is improved, and sink generated at the time of cooling can be prevented. Further, the weight of the manufactured synthetic resin pallet can be reduced. Furthermore, the interval between the partition wall formed in the girder and the rib in the girder is set to 25 mm to 35 mm at equal intervals.
Therefore, the welding strength between the upper skid and the lower skid is not weakened.

[Brief description of the drawings]

FIG. 1 is a perspective view of a corner girder portion of a lower skid forming a synthetic resin pallet of the present invention.

FIG. 2 is a perspective view of an intermediate girder portion of a lower skid forming a synthetic resin pallet of the present invention.

FIG. 3 is a perspective view of a center girder portion of a lower skid forming a synthetic resin pallet of the present invention.

FIG. 4 is a perspective view of an upper skid and a lower skid forming a conventional synthetic resin pallet.

FIG. 5 is a bottom view of an upper skid forming a conventional synthetic resin pallet.

FIG. 6 is a plan view of a lower skid forming a conventional synthetic resin pallet.

FIG. 7 is a perspective view of a conventional synthetic resin pallet.

FIG. 8 is a plan view of a corner girder portion of a lower skid forming a conventional synthetic resin pallet.

[Explanation of symbols]

 S1 ... upper skid S2 ... lower skid 7 ... partition wall 10 ... Corner girder part 12 ······· Rib inside girder 20 ············································································································

Claims (1)

[Claims] 1. A synthetic resin pallet formed by welding an upper skid and a lower skid, each of which is a semi-finished product made of a synthetic resin, as a semi-finished product. A pallet made of synthetic resin, wherein the wall thickness of the tip of each of the wall, the partition wall, and the rib in the girder is 3.5 mm or less, and the interval between the partition wall or the rib in the girder is 25 mm to 35 mm.