JP2002002691A - Pallet made of synthetic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the strength and rigidity of a pallet without increasing the weight thereof by making larger the width of a horizontal portion of at least one of T-shaped ribs for connecting beams than that of horizontal portions of other T-shaped ribs for connecting ribs. SOLUTION: In the pallet made of a synthetic resin having an upper deck board p1, a lower deck board p2, and beams 1a, 1b, 1c for connecting an upper deck board and a lower deck board, the width of a horizontal portion 2a of at least one of T-shaped ribs 2 for connecting beams is made larger than that of horizontal portions 3a, 4a, 5a of other T-shaped ribs 3, 4, 5.

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 used for transporting and storing articles.

[0002]

2. Description of the Related Art Conventionally, a synthetic resin pallet including an upper deck board, a lower deck board, and a girder connecting the upper deck board and the lower deck board has been known. A T-shaped rib consisting of a vertical portion extending downward from the center of the horizontal portion intersects and is formed in a mesh shape, and the lower deck board extends to the lower end of the vertical portion and the vertical portion. It is formed in a mesh shape in which inverted T-shaped ribs composed of horizontal portions intersect.

[0003]

In the above-mentioned conventional synthetic resin pallet, the thickness of the rib is increased in order to increase the strength. As the weight increases, there is a problem that simply increasing the thickness of the rib does not result in an effective increase in strength corresponding to the increase in weight.

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

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention firstly comprises an upper deck board, a lower deck board, and a girder connecting the upper deck board and the lower deck board. In the synthetic resin pallet having, the width of the horizontal part of at least some of the T-shaped ribs connecting the girders is wider than the width of the horizontal part of the other T-shaped ribs, Second, the T connecting the digits
Among the ribs other than the letter-shaped ribs, the height of the vertical part of at least some of the ribs is lower than the height of the vertical part of the other T-shaped ribs.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 to 6, an embodiment of the present invention will be described in which a pair of skids, which are semi-finished products integrally formed of the same shape and made of synthetic resin, are welded at a girder portion. Pallets made of synthetic resin used on both sides (hereinafter simply referred to as
Also called a pallet. ) Will be described as an example.

As described above, the pallet P is formed by welding a pair of skids S, which are made of synthetic resin and are semi-finished products of the same shape, at the tubular girder portion. The square skid S has a corner girder 1a 'formed at four corners, an intermediate girder 1b' formed between the corner girder 1a ', and a center girder 1c' formed at the center.
And And the corner girder part 1 of the pair of skids S
The pallets are formed by welding the end faces a ′, the end faces of the intermediate girder 1b ′, and the end faces of the center girder 1c ′ to each other.

The pallet formed as described above includes an upper deck board p1, a lower deck board p2,
A cylindrical corner girder 1a formed of corner girder portions 1a 'and 1a "formed at four corners, and an intermediate girder portion 1 formed between the corner girder 1a.
b ′, 1b ″ and a cylindrical central girder 1c including a central girder 1c ′, and between the corner girder 1a and the intermediate girder 1b and between the middle girder 1b and the middle girder 1b. A fork insertion opening p3 into which a fork of a forklift can be inserted is formed between the center girder and the upper deck board p1 and the lower deck board p2 which constitute the pallet thus formed. Plane p1 ', p
A peripheral wall p4 extending downward and upward from the peripheral edge of 2 ′ is formed, and a corner girder 1a and an intermediate girder 1b are formed near the inner side of the peripheral wall p4. The outer wall surface of the girder 1b may be configured to be flush with the outer surface of the peripheral wall p4.

The rib structure formed on the lower surface of the upper deck board p1 and the upper surface of the lower deck board p2 will be described below. In this embodiment, the upper deck board p1 and the lower deck board p2 are the same. Since it has a shape, only the rib structure formed on the lower surface of the upper deck board p1 will be described.

On the lower surface of the upper deck board p1 located between the corner girder 1a and the intermediate girder 1b, a corner girder 1a 'and an intermediate girder 1 are provided.
A plurality of inter-segment connecting ribs 2 for connecting b ′ and a plurality of inter-segment orthogonal ribs 3 orthogonal to the inter-segment connecting rib 2 are vertically provided so as to intersect. Similarly, on the lower surface of the upper deck board p1 located between the intermediate girder 1b 'and the center girder 1c', a plurality of girder connecting ribs 2 for connecting the intermediate girder 1b 'and the center girder 1c' are formed. A plurality of inter-span orthogonal ribs 3 orthogonal to the inter-spar connection ribs 2 are vertically provided so as to intersect.
Further, between the corner girder portion 1a 'and the middle girder portion 1b', and
Region R other than the region located between b ′ and central girder 1c ′
(Hereinafter, this area is referred to as an out-of-spar area.) On the lower surface of the upper deck board p1, a plurality of out-of-spar ribs 4, 5 running vertically and horizontally are vertically provided.

In this embodiment, the end located on the side of the peripheral wall p4 of the inter-span orthogonal rib 3 orthogonal to the inter-span connecting rib 2 connecting the corner girder 1a 'and the intermediate girder 1b' has a peripheral wall. p4
An inclined portion 3 ′ is formed to be inclined downward in the direction of the inter-spar connecting rib 2 from the other, and the inter-span connecting rib 2 ′ adjacent to the peripheral wall p <b> 4 is also aligned with another spar according to the inclined portion 3 ′. It is formed lower than the inter-connection rib 2. Then, the inclined portion 3 'of the inter-girder orthogonal rib 3 and the inter-girder connecting rib 2' having a low height are provided.
Thus, a virtual inclined surface is formed, and by forming such a virtual inclined surface, the fork insertion port p3 is formed so as to gradually expand outward, so that the fork insertion port p3 is formed. Inserting the fork into the fork becomes easy.

The above-mentioned upper deck board p1 has an inter-girder connecting rib 2 for connecting the corner girder 1a 'and the intermediate girder 1b', and an inter-girder orthogonal rib 3 orthogonal to the inter-girder connecting rib 2. , An inter-spar connection rib 2 for connecting the intermediate girder portion 1b 'and the center girder portion 1c', an inter-spar orthogonal rib 3 orthogonal to the inter-spar connection rib 4, and an outer girder located in the non-spar region R. The ribs 4 and 5 have a horizontal section 2a, 3a, 4a, 5a and a horizontal section 2a, 3a, 4a, 5a,
vertical parts 2b, 3b, 4 vertically downward from the center of
b, 5b, and a mesh-shaped deck surface P is formed by the upper surfaces of the horizontal portions 2a, 3a, 4a, and 5a.

In this embodiment, the ribs connecting the girders, that is, the corner girders 1 constituting the upper deck board p1.
The width d1 (in the length direction) of the inter-girder connecting rib 2 connecting the a ′ and the intermediate girder 1b ′ and the horizontal portion 2a of the inter-girder connecting rib 2 connecting the intermediate girder 1b ′ and the center girder 1c ′. The width of a vertical horizontal portion) is formed wider than the width d2 of the other ribs, that is, the inter-spar orthogonal ribs 3 and the inter-spar outer ribs 4, 5. As described above, by increasing the width d1 of the horizontal portion of the inter-spar connection rib 2 that connects the inter-spars, the strength of the inter-spar connection rib 2 can be increased. Therefore, the strength and rigidity of the pallet can be reduced. The weight can be increased while suppressing an increase in weight.

In the above-described embodiment, the inter-girder connecting rib 2 and the intermediate girder 1 connecting the corner girder 1a 'and the intermediate girder 1b' are provided.
An example is shown in which the width d1 of all the horizontal portions 2a of the inter-spar connection ribs 2 connecting the b 'and the center girder portion 1c' is wider than the widths of the other ribs. It is not necessary to increase the width d1 of the inter-connecting rib 2, and only the horizontal portion 2a of the appropriate number of inter-digit connecting ribs 2 can be formed wide.

In the above-described embodiment, as an example,
A double-sided pallet formed by welding a pair of skids S, which are semi-finished products integrally formed in the same shape with a synthetic resin, at a girder portion is shown. Without being limited, the present invention can be applied to a single-sided pallet.

Further, in the above-described embodiment, the upper and lower portions of the corner girder 1a, the intermediate girder 1b and the center girder 1c are formed in a mesh shape, but may be formed in a solid plate shape.

Another embodiment of the present invention will be described with reference to FIGS.

In this embodiment, the ribs other than the inter-span connecting ribs 2
That is, the vertical portions 3 of the inter-spar orthogonal ribs 3 and the inter-spar outer ribs 4,
b, 4b, and 5b, the height h1 of which is lower than the height h2 of the vertical portion 2b of the inter-girder connecting rib 2; Vertical part 3
By forming the height h1 of b, 4b, 5b lower than the height h2 of the vertical portion 2b of the inter-span connecting rib 2, reduction in the strength and rigidity of the pallet is suppressed, and the weight of the entire pallet is reduced. be able to. The height h of the vertical portions 3b, 4b, 5b of all the inter-girder orthogonal ribs 3 and the outer girder ribs 4, 5
1 without reducing the desired number of vertical portions 3b, 4b, 5b of only the desired number of inter-girder orthogonal ribs 3 and outer girder ribs 4, 5.
Height h1 can be configured to be low.

Next, specific test results will be described with reference to FIGS. In addition, the test mentioned later was performed based on the plastic flat pallet reference test of JISZ606.

As shown in FIG. 10, a pallet P having a size of 1130 mm × 1440 mm and a thickness of 140 mm is placed on a supporting member t1 arranged at an interval of 1240 mm, as shown in FIG. Weight is 500k
g of weight t2 is evenly placed on the upper surface of the pallet, and a dial gauge t3 is arranged between the lower surface of the pallet and the test table under a condition of a temperature of 23 degrees Celsius to perform a bending test. went.

The rib shape of the pallet tested was rib A
As shown in FIG. 11 (a), the width of the horizontal portion is 6 mm, its thickness is 3 mm, the length of the vertical portion is 27 mm, its thickness is 3 mm, and the rib is 11B, the width of the horizontal portion is 12 mm, its thickness is 3 mm, and the length of the vertical portion is 27 mm, as shown in FIG.
mm, the thickness is 3 mm, and the rib C has a width of 6 mm as shown in FIG.
The thickness is 3 mm, the length of the vertical part is 27 mm,
Its thickness is 4 mm. The cross-sectional area of the rib A is 99 mm
2, the cross-sectional area of the rib B is 117 mm @ 2, and the cross-sectional area of the rib C is 126 mm @ 2. And weight t
100 hours after the placement of No. 2, the deflection of the center portion of the pallet was 23.5 mm in the case of the rib B, but was 30.1 mm in the case of the rib C. About 28%, the amount of deflection was small. Therefore, when there is a rib such as A, increasing the width of the horizontal portion like the rib B increases the wasteful weight rather than increasing the thickness of the vertical portion like the rib C. Effectively without
The rigidity of the pallet will increase. The present invention has been made based on such findings.

[0022]

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

The width of the horizontal portion of at least some of the T-shaped ribs connecting the beams is wider than the width of the horizontal portion of the other T-shaped ribs. The weight can be increased while suppressing an increase in weight.

The height of the vertical portion of at least some of the ribs other than the T-shaped ribs connecting the spar is lower than the height of the vertical portions of the other T-shaped ribs. A reduction in rigidity can be suppressed, and the weight of the entire pallet can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a synthetic resin pallet of the present invention.

FIG. 2 is a perspective view of the upper deck board constituting the synthetic resin pallet shown in FIG. 1 as viewed from below.

FIG. 3 is a partial perspective view of the upper deck board shown in FIG. 2 as viewed from below.

FIG. 4 is a partial perspective view of the upper deck board also shown in FIG. 2 as viewed from below.

FIG. 5 is a partial perspective view of the upper deck board constituting the synthetic resin pallet of the present invention, similar to FIG. 3, as viewed from the lower surface.

FIG. 6 is a partial perspective view of the same synthetic resin pallet of the present invention as seen in FIG. 3 as viewed from the lower surface of the upper deck board.

FIG. 7 is a perspective view seen from the lower surface of an upper deck board constituting a synthetic resin pallet according to another embodiment of the present invention.

FIG. 8 is a partial perspective view of the upper deck board constituting the synthetic resin pallet shown in FIG. 7 as viewed from the lower surface.

FIG. 9 is a partial perspective view of the upper deck board constituting the synthetic resin pallet shown in FIG. 7 as viewed from the lower surface.

FIG. 10 is a front view showing a test method.

FIG. 11 shows a rib shape in which dimensions of each part used in the test are described.

[Explanation of symbols]

 p1 Upper deck board p2 Lower deck board 2 Digit Inter-connecting ribs 3 ... Ribular orthogonal ribs 4,5 ... Ribber outer ribs

Claims (2)

[Claims] 1. A synthetic resin pallet having an upper deck board, a lower deck board, and a girder connecting the upper deck board and the lower deck board, wherein at least a part of T-shaped ribs connecting the girder is provided. A pallet made of synthetic resin, wherein the width of the horizontal portion of the rib is wider than the width of the horizontal portion of the other T-shaped rib. 2. The ribs other than the T-shaped ribs connecting the spar are characterized in that at least some of the ribs have a vertical portion lower in height than the vertical portions of the other T-shaped ribs. The pallet made of synthetic resin according to claim 1.