JP2009208834A - Pallet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pallet which prevents cladding bodies from being exfoliated from beam bodies. <P>SOLUTION: The pallet 1 is provided with a top deck 2 and a bottom deck 3 which take a square form viewed from above, several beam bodies 4a which are placed at the periphery part of each of the decks 2, 3 and connect the decks with each other, and cladding bodies 5a which cover sides of the beam bodies 4a. Each of the decks 2, 3 and beam bodies 4a is composed of a first resin material and the cladding bodies 5a are composed of second resin materials, and they are integrally molded by two-color molding. The beam bodies 4a are installed on a tubular periphery wall 41a provided with an outer wall 42a along the periphery of each of the decks 2, 3 as well as on the inner side of the periphery wall 41a, and are composed of reinforced ribs 45a that are connected to the outer wall 42a. The cladding bodies 5a are provided with cladding sections 51a which cover the outer surface of the outer wall 42a and filling sections 52a which slide inside the outer wall 42a and the reinforced ribs 45a. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a pallet used to transport a load such as a load by a forklift. More specifically, the upper deck and the lower deck, girders that connect the decks, and a covering that covers the side surfaces of the girders, each deck and the girders are made of the first resin material and the coverings are formed. The present invention relates to a pallet made of a second resin material.

  As this kind of pallet, for example, a pallet disclosed in Patent Document 1 is known. The pallet of Patent Document 1 is arranged at the upper deck and the lower deck having a square shape in plan view, the four corners of each deck, the middle part of the four sides of each deck, and the middle part between the middle parts, and each deck. And a square cylindrical girder that connects the two. And the covering body which covers the outer surface is laminated | stacked on the outer surface of the wall (outer wall) arrange | positioned so that the peripheral edge of each deck among the four walls which comprise a square cylindrical girder. The pallet of Patent Document 1 is integrally molded by a two-color molding method, and each deck and girders are made of a first resin material and the covering is made of a second resin material having a color different from that of the first resin material. It is composed. In addition, fork insertion holes for inserting forks such as forklifts and hand forks are formed between the girders, resulting in a four-way pallet with a pair of fork insertion holes formed on each side of the pallet. ing.

In the pallet of Patent Document 1, the visibility of the fork insertion hole from the side of the pallet is improved by making the color of the covering layered on the outer wall of the beam different from other parts, and the fork hits the beam. It is configured to suppress the occurrence of an insertion error when inserting a fork such as.
JP 2006-282277 A

  By the way, since the covering body of the pallet of Patent Document 1 is merely laminated on the outer surface of the outer wall of the beam body, when the impact such as a fork hits against the covering body, the beam is applied. There was a problem that the covering was easy to peel from the body. The invention of this pallet is made in view of such a conventional situation, and an object thereof is to suppress peeling of the covering from the beam.

  In order to achieve the above object, the pallet according to claim 1 is provided with an upper deck and a lower deck having a quadrangular shape in plan view, and a plurality of pallets arranged at a peripheral portion of each deck and connecting the decks. A girder and a covering that covers the side surface of the girder, each deck and the girder being made of a first resin material, and the covering being made of a second resin material, by two-color molding In the integrally formed pallet, the beam body includes a cylindrical peripheral wall portion having an outer wall along the periphery of each deck, and a reinforcing rib provided on the inner side of the peripheral wall portion and connected to the outer wall. The covering body includes a covering portion that covers an outer surface of the outer wall, and a filling portion that sinks into the outer wall and the reinforcing rib.

  According to the above configuration, since the filling portion which is a part of the covering body has a shape that is embedded in the outer wall and the reinforcing rib of the beam body, the second resin material and the beam body constituting the covering body are configured. A wide contact area with the first resin material is ensured. Thereby, the adhesiveness of a girder and a covering increases, and peeling of the covering from a girder is suppressed.

  According to the pallet of the present invention, peeling of the covering from the beam can be suppressed.

Hereinafter, the pallet 1 of this invention is demonstrated based on drawing.
As shown in FIG. 1A, the pallet 1 is configured by connecting an upper deck 2 and a lower deck 3 having a square shape in plan view by a girder 4 having a rectangular shape in plan view. FIG. 1A is a top view of the pallet 1, and the right side portion shows a state in which the upper deck 2 is removed. On the outer surface of the upper deck 2, an anti-slip material 2 a for suppressing slipping on the load placed on the pallet 1 is attached. A plurality of ribs extending in the vertical and horizontal directions are provided on the inner surfaces of the upper deck 2 and the lower deck 3.

  The girder 4 is located at the corner girder 4a located at the four corners of the decks 2 and 3, the middle girder 4b located at the middle part of the four sides of the decks 2 and 3, and the middle part of the decks 2 and 3. And a central girder 4c. A fork insertion hole 6 for inserting a fork such as a forklift or a hand fork is formed between the girders 4, and the pallet 1 has four sides with a pair of fork insertion holes 6 open on each side. Form a feed pallet. In the present embodiment, among the girders 4, the corner girders 4a and the intermediate girders 4b arranged along the peripheral edges of the decks 2 and 3 correspond to the "girder" defined in the claims. It becomes the composition to do.

Next, the corner beam 4a will be described. As shown in FIG. 1B, a peripheral wall portion 41 a that forms a rectangular tube forming the corner beam 4 a is arranged along the peripheral edge of each deck 2, 3 and an outer wall 42 a that forms the side surface of the pallet 1. And an inner wall 43a located inside each of the decks 2 and 3. In the corner girder 4a, the outer wall 42a and the inner wall 43a constitute two surfaces of the peripheral wall portion 41a each having a rectangular cylindrical shape. Then, by forming the outer wall 42a to be thinner than the inner wall 43a, the peripheral wall portion 41a is formed with a recess 44a extending over the entire outer surface side of the outer wall 42a. In the present embodiment, the recessed depth of the recess 44a is set to be smaller than the thickness of the outer wall 42a (in FIG. 1B, the recess 44a is shown larger than the actual depth). .)
Moreover, as shown in FIG.1 (b) and FIG. 2, the reinforcement rib 45a for reinforcing the surrounding wall part 41a is provided inside the surrounding wall part 41a. The reinforcing rib 45a protrudes from the inner surfaces of the upper deck 2 and the lower deck 3, and the side ends thereof are connected to the peripheral wall portion 41a. Specifically, the reinforcing rib 45a connects two opposing walls of the peripheral wall portion 41a and crosses the cross, and one rib connecting the intersection and the connecting portion between the outer wall 42a. It consists of and. Further, the reinforcing rib 45a is formed thicker than any of the outer wall 42a and the inner wall 43a of the peripheral wall portion 41a, and is thicker than the rib provided on each of the decks 2 and 3 described above, and its protruding height. It is formed to be large.

  As shown in FIGS. 1B and 2, a covering 5a that covers the outer surface of the outer wall 42a of the peripheral wall portion 41a is formed on the corner beam 4a. The covering body 5a is formed in a recess 44a provided in the peripheral wall portion 41a and is laminated on the outer surface side of the outer wall 42a, and each reinforcing rib via a connecting portion 46a between the reinforcing rib 45a and the outer wall 42a. It is comprised from the filling part 52a which entered the inside of 45a. The filling portion 52a extends along the reinforcing rib 45a with the connecting portion 46a between the outer wall 42a and the reinforcing rib 45a as a base end, and the tip 53a reaches the connecting portion between the reinforcing rib 45a and the inner wall 43a.

Next, the intermediate digit 4b will be described. As shown in FIG. 3, the peripheral wall portion 41 b that forms a rectangular tube forming the intermediate beam 4 b is arranged along the peripheral edge of each deck 2 and 3, and the outer wall 42 b that forms the side surface of the pallet 1, and each deck It is formed by the inner wall 43b located inside 2 and 3. In the intermediate girder 4b, the outer wall 42b constitutes one surface of a peripheral wall portion 41b that forms a rectangular tube shape, and the inner wall 43b constitutes three surfaces of the peripheral wall portion 41b. Then, by forming the outer wall 42b thinner than the inner wall 43b, the peripheral wall portion 41b is formed with a recess 44b extending over the entire outer surface side of the outer wall 42b. In the present embodiment, the recessed depth of the recess 44b is set to be smaller than the thickness of the outer wall 42b (in FIG. 3, the recess 44b is shown larger than the actual depth).
Further, a reinforcing rib 45b for reinforcing the peripheral wall portion 41b is provided inside the peripheral wall portion 41b. The reinforcing ribs 45b project from the inner surfaces of the upper deck 2 and the lower deck 3, and the side ends thereof are connected to the peripheral wall portion 41b. Specifically, the reinforcing rib 45b includes two ribs that connect the opposing walls of the peripheral wall portion 41b and intersect each other in a cross shape. Further, the reinforcing rib 45b is formed thicker than any of the outer wall 42b and the inner wall 43b of the peripheral wall portion 41b, and is thicker than the ribs provided on the decks 2 and 3 described above, and its protruding height. It is formed to be large.

  As shown in FIG. 3, a cover 5b is formed on the intermediate beam 4b as well as the outer wall 42b of the peripheral wall portion 41b in the same manner as the corner beam 4a. The covering body 5b is formed in the recess 44b provided in the peripheral wall portion 41b and is laminated on the outer surface side of the outer wall 42b, and the reinforcing rib 45b is connected to the reinforcing rib 45b via a connecting portion 46b between the reinforcing rib 45b and the outer wall 42b. It is comprised from the filling part 52b which sunk inside. The filling portion 52b extends from the connecting portion 46b between the outer wall 42b and the reinforcing rib 45b along the reinforcing rib 45b, and the tip 53b reaches the connecting portion between the reinforcing rib 45b and the inner wall 43b.

  In the intermediate beam 4b, the filling portion 52b is provided not only inside the reinforcing rib 45b (reinforcing rib extending in the left-right direction in FIG. 3) connecting the outer wall 42b and the inner wall 43b facing the outer wall 42b. Further, it is also formed inside reinforcing ribs 45b (reinforcing ribs extending in the vertical direction in FIG. 3) that connect the opposing inner walls 43b.

  Next, the central girder 4c will be described. As shown to Fig.1 (a), the surrounding wall part 41c which makes | forms the square cylinder shape which comprises the center girder 4c is formed of two pairs of opposing inner walls. A reinforcing rib 45c for reinforcing the peripheral wall portion 41c is provided inside the peripheral wall portion 41c. The reinforcing ribs 45c project from the inner surfaces of the upper deck 2 and the lower deck 3, and the side ends thereof are connected to the peripheral wall portion 41c. Specifically, the reinforcing rib 45b is composed of two ribs that connect between the opposing inner walls of the peripheral wall portion 41b and intersect the cross.

  In the pallet 1 of this embodiment, the decks 2 and 3 and the girders 4 are made of a synthetic resin made of recycled material, and the coverings 5a and 5b are made of a synthetic resin made of virgin material. In the present embodiment, the synthetic resin of the recycled material corresponds to the first resin material, and the synthetic resin of the virgin material corresponds to the second resin material.

Next, a method for forming the pallet 1 will be described.
The pallet 1 is integrally formed by dividing the pallet 1 into two parts at the center of the beam 4 in the vertical direction (upper and lower sides of the broken line in FIG. 2) by a two-color molding method using an injection molding machine. At the same time, these are integrated by welding. A general two-color molding method is described in Patent Document 1. Here, based on FIG. 4, the aspect which forms the covering bodies 5a and 5b with respect to the girder 4 is demonstrated taking the corner girder 4a as an example.

  First, a recycled material synthetic resin is injected and filled in a mold (not shown). Thereafter, cooling is performed, and the synthetic resin filled in the mold is solidified to form the decks 2 and 3 and the girders 4 (see FIG. 4A). In that case, a difference arises in the solidification speed | rate of both members based on the difference of the thickness of the reinforcement rib 45a and the surrounding wall part 41a (outer wall 42a). Thereby, even if the outer wall 42a is completely solidified, for a while, the reinforcing rib 45a is solidified only at the outer peripheral portion (outside of the broken line in FIG. 4B), and the inside (FIG. 4 ( The inside of the broken line in b) is in a semi-solid state where a semi-molten resin is present (see FIG. 4B). Further, when the reinforcing rib 45a is solidified, sink marks 47a are generated on the outer surface side of the portion of the outer wall 42a where the reinforcing rib 45a is connected, and irregularities are formed on the outer surface of the outer wall 42a.

  Subsequently, when the outer wall 42a is solidified and the reinforcing rib 45a is semi-solidified, a synthetic resin of virgin material is injected and filled into the mold (see FIG. 4C). At this time, the synthetic resin of the virgin material is filled in the concave portion 44a formed in the peripheral wall portion 41a to form the covering portion 51a. Further, due to the injection pressure, a part of the connecting portion 46a between the reinforcing rib 45a and the outer wall 42a is broken through to enter the semi-molten reinforcing rib 45a to form the filling portion 52a.

Next, operational effects in the present embodiment will be described below.
(1) In the pallet 1 of this embodiment, the corner girder 4a and the intermediate girder 4b are connected to the peripheral wall portions 41a and 41b having the outer walls 42a and 42b along the peripheral edges of the decks 2 and 3, and the peripheral wall portions 41a and 41b. Reinforcing ribs 45a and 45b are provided on the inner side and connected to the outer walls 42a and 42b. The coverings 5a and 5b are composed of covering portions 51a and 51b that cover the outer surfaces of the outer walls 42a and 42b, and filling portions 52a and 52b that have entered the outer walls 42a and 42b and the reinforcing ribs 45a and 45b. Yes.

  According to the above configuration, the filling portions 52a and 52b, which are part of the coverings 5a and 5b, are shaped to be embedded in the outer walls 42a and 42b and the reinforcing ribs 45a and 45b of the corner girders 4a and the intermediate girders 4b. ing. Therefore, it is possible to secure a wide contact area between the synthetic resin of the virgin material constituting the coverings 5a and 5b and the synthetic resin of the recycled material constituting the corner girders 4a and the intermediate girders 4b. As a result, the degree of adhesion between the corner girders 4a and the intermediate girders 4b and the covering bodies 5a and 5b is increased, and the peeling of the covering bodies 5a and 5b from the corner girders 4a and the intermediate girders 4b is suppressed.

  Further, by covering the outer surfaces of the outer walls 42a and 42b with the covering portions 51a and 51b, sink marks 47a (47b) formed on the outer surfaces of the outer walls 42a and 42b are filled with the covering portions 51a and 51b. Therefore, the side surface of the pallet 1 can be formed more flat.

  (2) The structure in which the filling portions 52a and 52b made of different resin materials are inserted into the inside of the reinforcing ribs 45a and 45b is a characteristic based on the resin material constituting the coverings 5a and 5b with respect to the reinforcing ribs 45a and 45b. It is possible to grant. In this embodiment, the coverings 5a and 5b are made of a synthetic resin of a virgin material that is a resin material harder than a synthetic resin of a recycled material. Accordingly, the strength of the reinforcing ribs 45a and 45b is higher than that in the state where the filling portions 52a and 52b are not formed, that is, the state where the synthetic resin of the virgin material is not embedded. Moreover, the improvement of the strength of the reinforcing ribs 45a and 45b also improves the strength of the entire corner beam 4a and intermediate beam 4b.

  (3) By adopting a resin material having a higher impact resistance than the resin material constituting the girder 4 as the resin material constituting the coverings 5a and 5b, the tip of the fork collides from the side. The impact resistance of the pallet 1 against impact is enhanced.

  (4) In this embodiment, the recessed depth of the recesses 44a and 44b is set smaller than the thickness of the outer walls 42a and 42b. Therefore, the covering portions 51a and 51b formed in the recesses 44a and 44b are formed thinner than the outer walls 42a and 42b. Thereby, compared with outer wall 42a, 42b, it becomes difficult to produce a sink mark on the outer surface of coating | coated parts 51a, 51b.

  (5) In this embodiment, the reinforcing ribs 45a and 45b are formed thicker than the outer walls 42a and 42b. As a result, when the resin constituting the reinforcing ribs 45a and 45b and the outer walls 42a and 42b is solidified, the solidification speeds of both members can be made different. The outer walls 42a and 42b are solidified and the reinforcing ribs 45a and 45b are A semi-solid state can be easily created. Therefore, the filling portions 52a and 52b can be easily embedded in the reinforcing ribs 45a and 45b.

  (6) In the present embodiment, the filling portions 52a and 52b are formed such that the tips 53a and 53b reach the connection portions between the reinforcing ribs 45a and 45b and the inner walls 43a and 43b. As a result, the strength of the reinforcing ribs 45a and 45b connecting the outer walls 42a and 42b and the inner walls 43a and 43b is enhanced as a whole.

In addition, this embodiment can also be changed and embodied as follows.
In the present embodiment, the present invention is embodied in a four-way pallet, but the present invention may be embodied in another pallet such as a two-way pallet. For example, when the present invention is embodied in a two-way pallet, the girder 4 is in the shape of a rectangular tube with a long plan view arranged along one opposing side edge of the peripheral edges of the decks 2 and 3. And a pair of girders having a rectangular shape in a plan view arranged between the girders.

  In the present embodiment, the decks 2 and 3 and the girders 4 are made of synthetic resin of recycled material, and the coverings 5a and 5b are made of synthetic resin of virgin material. The synthetic resin is not limited to this, and any synthetic resin may be selected. For example, the decks 2 and 3 and the girders 4 and the coverings 5a and 5b may be made of the same synthetic resin. Moreover, you may select the synthetic resin which has elasticity as a resin material which comprises the coverings 5a and 5b. When configured in this way, stress acting on the reinforcing ribs 45a and 45b can be absorbed by the filling portions 52a and 52b made of synthetic resin having elasticity, and damage is unlikely to occur.

  In the present embodiment, the beam body 4 is formed in a square cylinder shape in plan view, but the shape of the beam body 4 is not limited to this. For example, it may be formed in a polygonal cylindrical shape in plan view, or may be formed in a cylindrical shape in plan view (including an elliptical cylindrical shape).

  The shape of the reinforcing ribs 45a and 45b may be appropriately changed as long as a part thereof is connected to the outer walls 42a and 42b. For example, in the present embodiment, both end portions of the reinforcing ribs 45a and 45b are connected to the outer walls 42a and 42b and the inner walls 43a and 43b facing the outer walls 42a and 42b, respectively, but are connected to the inner walls 43a and 43b. It is good also as a structure connected only to the outer walls 42a and 42b. Further, in the corner girder 4a, the reinforcing rib 45a may be formed in a circular arc shape or L shape in plan view, and both end portions thereof may be connected to the adjacent outer wall 42a. Further, the reinforcing ribs 45a and 45b may be formed so as to protrude from the outer walls 42a and 42b so as to extend in the vertical direction.

  -The recessed depths of the recesses 44a and 44b may be set to be the same as the thickness of the outer walls 42a and 42b so that the thickness of the covering portions 51a and 51b and the thickness of the outer walls 42a and 42b are the same. . In addition, the recesses 44a and 44b are set so that the depth of the recesses is greater than the thickness of the outer walls 42a and 42b, so that the thickness of the covering portions 51a and 51b is greater than the thickness of the outer walls 42a and 42b. May be.

  In the present embodiment, the filling portions 52a and 52b are formed so that the tips 53a and 53b reach the connection portions between the reinforcing ribs 45a and 45b and the inner walls 43a and 43b. The tips 53a and 53b may not reach the connection portion. In addition, when ribs or crosspieces for connecting the beam bodies 4 are provided, the ends 53a and 53b of the filling portions 52a and 52b extend beyond the connection portions between the reinforcing ribs 45a and 45b and the inner walls 43a and 43b. And it may reach even the inside of the rib or bar.

  In the present embodiment, the reinforcing ribs 45a and 45b are formed thicker than any of the outer walls 42a and 42b and the inner walls 43a and 43b. However, how the thickness of the reinforcing ribs 45a and 45b is set. It may be. If the thickness of the reinforcing ribs 45a and 45b is set to the same level as the outer walls 42a and 42b and the inner walls 43a and 43b, when the resin is solidified, the degree of cooling in each part is changed to solidify each part. Adjust the speed.

  In the present embodiment, the filling portions 52a and 52b are formed inside the reinforcing ribs 45a and 45b, but the filling portions are also provided inside the portions other than the reinforcing ribs 45a and 45b, such as the inner walls 43a and 43b and other ribs. 52a and 52b may be formed.

  The upper deck 2 and the lower deck 3 may be provided with side wall portions that connect the outer wall 42a of the corner beam 4a and the outer wall 42b of the intermediate beam 4b to the peripheral portion thereof. This side wall portion is a portion located above and below the opening portion of the fork insertion hole 6 formed between the girders 4. When such a side wall part is formed, you may form the coating body which coat | covers the same side wall part with respect to the outer surface of a side wall part. At this time, it is preferable that a reinforcing rib connected to the side wall portion is provided inside the side wall portion, and a filling portion is formed inside the reinforcing rib.

Next, a technical idea that can be grasped from the above embodiment and another example will be described.
The pallet is characterized in that the reinforcing rib is formed thicker than the outer wall.
The pallet is characterized in that the covering portion is formed thinner than the outer wall.

The pallet is characterized in that the second resin material is a resin material harder than the first resin material.
The peripheral wall portion has an inner wall that is located inside each deck and faces the outer wall, and the reinforcing rib is provided so as to connect the outer wall and the inner wall. Has reached the connecting portion between the reinforcing rib and the inner wall.

(A) is a top view of the pallet of this embodiment, (b) is an enlarged view around a corner girder in (a). AA line sectional view in Drawing 1 (b). FIG. 2 is an enlarged view around the intermediate beam in FIG. (A)-(c) is explanatory drawing of the pallet shaping | molding method.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Pallet, 2 ... Upper deck, 3 ... Lower deck, 4 ... Girder body, 5a, 5b ... Covering body, 41a, 41b, 41c ... Peripheral wall part, 42a, 42b ... Outer wall, 45a, 45b, 45c ... Reinforcement rib, 51a, 51b ... covering portion, 52a, 52b ... filling portion.

Claims (1)

An upper deck and a lower deck having a quadrangular shape in plan view, a plurality of girders that are arranged at a peripheral portion of each deck and that connect the decks, and a covering that covers the side surfaces of the girders. In the pallet which each deck and the above-mentioned girder are constituted by the first resin material and the covering body is constituted by the second resin material, and is integrally molded by two-color molding,
The girder consists of a cylindrical peripheral wall portion having an outer wall along the periphery of each deck, and a reinforcing rib provided on the inner side of the peripheral wall portion and connected to the outer wall,
The said covering body is provided with the coating | coated part which coat | covers the outer surface of the said outer wall, and the filling part which sunk into the inside of the said outer wall and the said reinforcement rib, The pallet characterized by the above-mentioned.

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