JP2009202933A - Synthetic resin-made pallet - Google Patents

Synthetic resin-made pallet Download PDF

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JP2009202933A
JP2009202933A JP2008049778A JP2008049778A JP2009202933A JP 2009202933 A JP2009202933 A JP 2009202933A JP 2008049778 A JP2008049778 A JP 2008049778A JP 2008049778 A JP2008049778 A JP 2008049778A JP 2009202933 A JP2009202933 A JP 2009202933A
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molding material
rib
pallet
ribs
girder
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JP5118510B2 (en
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Atsushi Kojima
篤史 小島
Takashi Kimura
隆志 木村
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Gifu Plastic Industry Co Ltd
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Gifu Plastic Industry Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a synthetic resin-made pallet capable of improving the bending strength between girder parts, preventing any bending with a boundary part of first and second molding materials being a base point, and preventing any breakage form being generated when a fore end of a fork is collided with a side end face of the pallet. <P>SOLUTION: At least two connection ribs 6 out of a plurality of the connection ribs 6 are formed of a first molding material 9 between girder parts 2. A part of a peripheral wall part 5, a part of ribs 8 between the girder parts, and a part of cross ribs 7 continuous thereto are formed of the first molding material 9. A portion except a portion formed of the first molding material 9 of the pallet 4 is formed of a second molding material 10. The first molding material 9 has the bending strength higher than that of the second molding material 10. A boundary portion between the first molding material 9 and the second molding material 10 in the ribs 8 between the plurality of girder parts is deviated in the direction orthogonal to the fork-inserting direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、曲げ強度の強い合成樹脂製のパレットに関するものである。   The present invention relates to a pallet made of synthetic resin having high bending strength.

従来から合成樹脂製のパレットにおいて最も強度（曲げ強度）が必要となる桁部間を繋ぐ部位を曲げ強度の強い成形材料で形成したものが特許文献１により知られている。   Conventionally, Patent Document 1 discloses that a portion connecting between beam portions that require the most strength (bending strength) in a synthetic resin pallet is formed of a molding material having high bending strength.

この特許文献１に示された従来例にあっては、桁部間を繋ぐ部位におけるデッキ部の全部又は一部と、桁部間に設けられた補強リブとを曲げ強度の強い材料で成形したものであり、桁部間を繋ぐ部位を形成するための曲げ強度の強い材料である第１の成形材料と、パレットの上記以外の部位を形成するための第２の成形材料との境界部分はフォーク挿入方向と直交している。   In the conventional example shown in this Patent Document 1, all or a part of the deck portion at the portion connecting the spar portions and the reinforcing rib provided between the spar portions are formed of a material having a high bending strength. The boundary portion between the first molding material, which is a material having a high bending strength for forming a portion connecting the beam portions, and the second molding material for forming a portion other than the above of the pallet is It is perpendicular to the fork insertion direction.

ところで、桁部間に形成されるフォーク挿入部にフォークを挿入してパレットを持ち上げると、フォーク挿入方向に対して直交する方向に大きな曲げ応力が作用するので、上記のように、桁部間を繋ぐ部位を曲げ強度の強い材料で形成しているのであるが、第１の成形材料で成形した部位は曲げに対して強いが、第１の成形材料と第２の成形材料との境界部分は強度が弱く、しかも境界部分がフォーク挿入方向と直交しているため大きな曲げ応力が作用すると両成形材料が剥離しようとする力が作用し、フォーク挿入方向と直交する第１の成形材料と第２の成形材料との境界部分を基点として曲がって破損するというおそれがある。   By the way, when a fork is inserted into the fork insertion part formed between the girder parts and the pallet is lifted, a large bending stress acts in a direction perpendicular to the fork insertion direction. The part to be joined is made of a material having a high bending strength, but the part formed with the first molding material is strong against bending, but the boundary part between the first molding material and the second molding material is Since the strength is weak and the boundary portion is orthogonal to the fork insertion direction, if a large bending stress is applied, a force that causes both molding materials to peel off acts, and the first molding material and the second orthogonal to the fork insertion direction act. There is a possibility that the material may be bent and damaged with the boundary portion with the molding material as a base point.

また、上記特許文献１に示される従来にあっては、桁部間においてデッキ部も曲げ強度の強い第１の成形材料で形成してあるので、コストの高い曲げ強度の強い成形材料の使用量が増えてコストアップの原因となり、更に、パレットの重量も重くなる。
特開２００７−１８６２４４号公報 In the prior art disclosed in Patent Document 1, since the deck portion is also formed of the first molding material having high bending strength between the girder portions, the amount of the molding material having high bending strength and high cost is used. Increases the cost, and the weight of the pallet also increases.
JP 2007-186244 A

本発明は上記の従来の問題点に鑑みて発明したものであって、曲げ強度の強い成形材料の使用量を少なくして安価で且つ軽量でありながら桁部間を曲げに対して剥離しないように補強でき、しかも、第１の成形材料と第２の成形材料との境界部分を基点にして曲がって損傷するのを防止でき、また、簡単な構成で、曲げに対する補強ができる合成樹脂製のパレットを提供することを課題とするものである。   The present invention was invented in view of the above-described conventional problems, and the amount of a molding material having a high bending strength was reduced so that it was inexpensive and lightweight, but the spar portions were not peeled off against bending. Made of a synthetic resin that can be bent and damaged from the boundary between the first molding material and the second molding material as a base, and can be reinforced against bending with a simple configuration. It is an object to provide a pallet.

上記課題を解決するために本発明に係る合成樹脂製のパレットは、デッキ部１と、複数の桁部２とを備え、桁部２間がフォーク挿入部３となった合成樹脂製のパレット４において、該筒状をした桁部２の周壁部５間に桁部２間を連結する複数の連結リブ６を設けると共に連結リブ６と交差する交差リブ７を設け、桁部２の周壁部５の内面に複数の桁部内リブ８を設け、複数の連結リブ６のうち少なくとも２つ以上の連結リブ６が桁部２間にわたって第１の成形材料９により形成してあると共に当該桁部２間にわたって第１の成形材料９により形成してある２つ以上の連結リブ６の周壁部５との各連結部分及び該連結部分に隣接する桁部内リブ８の一部が第１の成形材料９により形成してあり、交差リブ７の一部が第１の成形材料９により形成してあり、パレット４の第１の成形材料９により形成された部分を除く部分が第２の成形材料１０により形成してあり、上記第１の成形材料９が第２の成形材料１０よりも曲げ強度の強い成形材料であり、複数の桁部内リブ８における上記第１の成形材料９と第２の成形材料１０との境界部分が、フォーク挿入方向と直交する方向においてずれていることを特徴とするものである。   In order to solve the above problems, a synthetic resin pallet according to the present invention includes a deck portion 1 and a plurality of girders 2, and a synthetic resin pallet 4 having a fork insertion portion 3 between the girders 2. 2, a plurality of connecting ribs 6 that connect between the girders 2 are provided between the peripheral walls 5 of the cylindrical girder 2, and cross ribs 7 that intersect the connecting ribs 6 are provided. A plurality of spar ribs 8 are provided on the inner surface of the slab, and at least two of the plurality of linking ribs 6 are formed of the first molding material 9 across the spar 2 and between the spar 2 Each of the connecting portions of the two or more connecting ribs 6 formed with the first molding material 9 with the peripheral wall portion 5 and a part of the spar inner rib 8 adjacent to the connecting portions are made of the first molding material 9. Formed and a part of the cross rib 7 is formed by the first molding material 9 The part of the pallet 4 excluding the part formed by the first molding material 9 is formed by the second molding material 10, and the first molding material 9 is bent more than the second molding material 10. It is a strong molding material, and the boundary portion between the first molding material 9 and the second molding material 10 in the plurality of girder inner ribs 8 is shifted in a direction perpendicular to the fork insertion direction. To do.

このような構成とすることで、桁部２間にわたって曲げ強度の強い成形材料で成形した２つ以上の連結リブ６部分が、周壁部５の上記該連結リブ６との連結部分５ａ及び桁部内リブ８の曲げ強度の強い成形材料で成形した部位と一体に成形してあり、これにより、高価な曲げ強度の強い第１の成形材料９の使用量を少なくしながら、桁部２間を連結する曲げ強度の強い第１の成形材料９よりなる連結リブ６を曲げ強度の強い第１の成形材料９で成形した上記連結部分５ａ及び桁部内リブ８の一部で補強しながら曲げに対する強度を強くすることができる。また、このように、桁部２間を連結する曲げ強度の強い第１の成形材料９よりなる連結リブ６を曲げ強度の強い第１の成形材料９で成形した上記連結部分５ａ及び桁部内リブ８の一部で補強しながら曲げに対する強度を強くするようにしたものにおいて、複数の桁部内リブ８における上記第１の成形材料９と第２の成形材料１０との境界部分５０が、フォーク挿入方向と直交する方向においてずれているので、フォークで持ち上げているパレット４に上方から大きな荷重がかかっても、第１の成形材料９と第２の成形材料１０との境界部分５０を基点として曲がるのが防止され、パレット４の破損を防止することができる。   By adopting such a configuration, two or more connecting ribs 6 formed by a molding material having a high bending strength between the beam portions 2 are connected to the connecting portion 5a of the peripheral wall portion 5 with the connecting rib 6 and the inside of the beam portion. The rib 8 is formed integrally with a portion formed of a molding material having a high bending strength, thereby connecting the beam portions 2 while reducing the amount of the expensive first molding material 9 having a high bending strength. Strength of the connecting rib 6 made of the first molding material 9 having high bending strength is strengthened by the connecting portion 5a formed by the first molding material 9 having high bending strength and a part of the rib 8 in the girder portion. Can be strong. In addition, the connecting portion 5a and the inner rib of the spar portion formed of the first molding material 9 having a high bending strength on the linking rib 6 made of the first molding material 9 having a high bending strength and connecting the spar portions 2 as described above. In the structure in which the strength against bending is increased while reinforcing with a part of 8, the boundary portion 50 between the first molding material 9 and the second molding material 10 in the plurality of girder inner ribs 8 is inserted into the fork. Since they are displaced in a direction perpendicular to the direction, even if a large load is applied to the pallet 4 lifted by the fork from above, the pallet 4 bends with the boundary portion 50 between the first molding material 9 and the second molding material 10 as a base point. This prevents the pallet 4 from being damaged.

本発明の請求項１記載の発明にあっては、上記のように構成したので、曲げ強度の強い第１の成形材料の使用量が少なくて安価で且つ軽量でありながら、簡単な構成で曲げ強度が弱い部分である桁部間を連結する連結リブを効果的に補強でき、しかも、フォーク挿入部にフォークを挿入してパレットを持ち上げている状態で、パレットに上方から大きな荷重がかかっても、曲げ強度の強い第１の成形材料と他の部位を形成するための第２の成形材料との境界部分を基点にしてパレットが曲がるのを簡単な構成で防止できる。   In the invention according to claim 1 of the present invention, since it is configured as described above, the first molding material having a high bending strength is used in a small amount, is inexpensive and lightweight, and can be bent with a simple configuration. Even if the pallet is lifted by inserting the fork into the fork insertion part, it can effectively reinforce the connecting ribs that connect the beam parts that are weak parts. Further, it is possible to prevent the pallet from being bent with a simple configuration based on the boundary portion between the first molding material having a high bending strength and the second molding material for forming another part.

以下、本発明を添付図面に示す実施形態に基いて説明する。   Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

合成樹脂製のパレット４は載置物を載置するためのデッキ部１と、複数の桁部２とを備えたもので、桁部２間がフォーク挿入部３となっている。   The pallet 4 made of synthetic resin is provided with a deck portion 1 for placing a placement object and a plurality of girders 2, and a fork insertion portion 3 is formed between the girders 2.

合成樹脂製のパレット４としては、全体を合成樹脂の一体成形により成形する一体成形型のパレット４と、上半体４ａと、下半体４ｂとを別々に成形して上半体４ａと下半体４ｂとを溶着一体化して成形する溶着タイプのパレット４とに大別でき、更に、一体成形型のパレット４、溶着タイプのパレット４のいずれのタイプも、上面部のみが載置物を載置するためのデッキ部となり、下面部に開口部を形成した片面使用タイプと、上面部及び下面部がいずれもデッキ部となり、上下反転することで、いずれの面もデッキ部として使用できる両面使用タイプのものがあるが、本発明においては、これらのいずれかのタイプに限定されるものではない。   As the pallet 4 made of synthetic resin, the upper half 4a and the lower half 4a are separately formed by separately molding the pallet 4 of an integral molding die that is molded by synthetic resin integral molding, the upper half 4a, and the lower half 4b. It can be broadly divided into a welding type pallet 4 which is formed by welding and integrating the half body 4b. Furthermore, in both types of the integrally forming pallet 4 and the welding type pallet 4, only the upper surface portion carries the object. A single-sided use type in which an opening is formed on the bottom surface, and the top and bottom surfaces are both decks, and both sides can be used as a deck by flipping up and down. There are types, but the present invention is not limited to any of these types.

以下添付図面に示す実施形態では、溶着タイプのパレット４で両面使用タイプの例（つまり上下両面がデッキ部１となっている例）を示して説明する。   Hereinafter, in the embodiment shown in the accompanying drawings, an example of a double-sided use type (that is, an example in which the upper and lower sides are the deck portion 1) is shown and described in the welding type pallet 4.

図１、図２に示すように、合成樹脂により一体成形した上半体４ａは、上面がデッキ部１（１ａ）となり、デッキ部１ａの下面に複数の筒状をした上桁部２ａを一体に垂設して構成してあり、合成樹脂により一体成形した下半体４ｂは、下面がデッキ部１（１ｂ）となり、デッキ部１ｂの上面に複数の筒状をした下桁部２ｂを上方に向けて一体に突設して構成してあり、上記の上半体４ａの上桁部２ａの下端面部と下半体４ｂの下桁部２ｂの上端面部とを熱溶着して上桁部２ａと下桁部２ｂとで桁部２を一体化することでパレット４を構成してある。   As shown in FIG. 1 and FIG. 2, the upper half 4a integrally formed of synthetic resin has a deck portion 1 (1a) on the upper surface, and a plurality of cylindrical upper beams 2a are integrally formed on the lower surface of the deck portion 1a. The lower half 4b formed integrally with the synthetic resin and integrally formed with a synthetic resin has a lower surface serving as a deck portion 1 (1b), and a plurality of cylindrical lower girders 2b formed on the upper surface of the deck portion 1b. The upper girder part is formed by projecting integrally toward the upper part of the upper half 4a by thermally welding the lower end part of the upper girder part 2a of the upper half part 4a and the upper end part of the lower girder part 2b of the lower half part 4b. The pallet 4 is constituted by integrating the girder part 2 with 2a and the lower girder part 2b.

上記上半体４ａと下半体４ｂとは同じ形状をしていて同じ成形金型により成形したものであってもよく、あるいは、異なる形状をしていて異なる成形金型により成形したものであってもよい。   The upper half 4a and the lower half 4b may have the same shape and are molded with the same molding die, or have different shapes and are molded with different molding dies. May be.

なお、以下の説明では、デッキ部１ａ、デッキ部１ｂはいずれも単にデッキ部１と表現し、上桁部２ａ、下桁部２ｂはいずれも単に桁部２として表現して説明する。   In the following description, both the deck portion 1a and the deck portion 1b are simply expressed as the deck portion 1, and the upper girder portion 2a and the lower girder portion 2b are both expressed simply as the digit portion 2.

上半体４ａ又は下半体４ｂのデッキ部１の裏面の桁部２間には、フォーク挿入部３の入口側端部となる部位にフォーク挿入ガイド用傾斜部２０が設けてあり、桁部２間の他の部位には連結リブ６がフォーク挿入方向に複数形成してあると共に、該複数の連結リブ６と交差する複数の交差リブ７が形成してある。   Between the beam portions 2 on the back surface of the deck portion 1 of the upper half body 4a or the lower half body 4b, a fork insertion guide inclined portion 20 is provided at a portion serving as an inlet side end portion of the fork insertion portion 3, and the beam portion A plurality of connecting ribs 6 are formed in the other portion between the two in the fork insertion direction, and a plurality of intersecting ribs 7 intersecting the plurality of connecting ribs 6 are formed.

桁部２は筒状をしており、この桁部２の周壁部５の内面に複数の桁部内リブ８が形成してあり、この複数の桁部内リブ８は上記複数の連結リブ６と対応しており、周壁部５の各連結リブ６との連結部分５ａにそれぞれ対応する桁部内リブ８が一直線状に連結してあるか、あるいはフォーク挿入方向に少しずれて連結してある。   The girder part 2 has a cylindrical shape, and a plurality of girder part inner ribs 8 are formed on the inner surface of the peripheral wall part 5 of the girder part 2, and the plurality of girder part inner ribs 8 correspond to the plurality of connecting ribs 6. The inner ribs 8 corresponding to the connecting portions 5a of the peripheral wall 5 with the connecting ribs 6 are connected in a straight line, or are connected with a slight shift in the fork insertion direction.

図１乃至図７に示す実施形態においては、デッキ部１は面板部１ｃにより構成してあり、この面板部１ｃの裏面に筒状をした桁部２が突設してあり、更に、面板部１ｃの裏面には桁部２間に複数の連結リブ６、連結リブ６と交差する交差リブ７が突設してある。   In the embodiment shown in FIGS. 1 to 7, the deck portion 1 is constituted by a face plate portion 1 c, and a cylindrical girder portion 2 protrudes from the back surface of the face plate portion 1 c, and the face plate portion A plurality of connecting ribs 6 and intersecting ribs 7 intersecting with the connecting ribs 6 are provided on the back surface of 1c so as to protrude between the beam portions 2.

交差リブ７は連結リブ６よりも肉厚が薄く、連結リブ６と交差し、交差部分において両者は一体化してある。交差リブ７は隣合う桁部２間だけでなく４つの桁部２（隅に位置する桁部２、中央に位置する桁部２、二辺の各中間に位置する桁部２）に囲まれた部分にも形成してあり、また、フォーク挿入部３の入口側端部には、桁部２の入り口側端部間にフォーク挿入ガイド用傾斜部２０が設けてある。   The intersecting rib 7 is thinner than the connecting rib 6, intersects the connecting rib 6, and both are integrated at the intersecting portion. The cross rib 7 is surrounded not only between the adjacent girder parts 2 but also by the four girder parts 2 (the girder part 2 located at the corner, the girder part 2 located at the center, and the girder part 2 located between the two sides). Further, a fork insertion guide inclined portion 20 is provided between the entrance side end portions of the beam portion 2 at the entrance side end portion of the fork insertion portion 3.

フォーク挿入ガイド用傾斜部２０は、パレット４の外端部を構成する外端リブ２０ａと、外端リブ２０ａの奥側にずれた位置において平行で隣り合う桁部２間にわたって形成された内側リブ２０ｂと、外端リブ２０ａと内側リブ２０ｂ間を繋ぐ傾斜リブ２０ｃとで構成してある。内側リブ２０ｂは連結リブ６と同じ突出長さ又は少し短い突出長さとなっており、外端リブ２０ａは内側リブ２０ｂよりも突出長さが短くなっており、傾斜リブ２０ｃは突出方向の端面部が外端リブ２０ａと連結一体化する側が突出長さが短く、内側リブ２０ｂ側にいくに従って突出長さが長くなるように傾斜している。   The inclined portion 20 for fork insertion guide is an inner rib formed between the outer end rib 20a constituting the outer end portion of the pallet 4 and the parallel and adjacent beam portions 2 at a position shifted to the back side of the outer end rib 20a. 20b and the inclined rib 20c which connects between the outer end rib 20a and the inner rib 20b. The inner rib 20b has the same protruding length as the connecting rib 6 or a slightly shorter protruding length, the outer end rib 20a has a shorter protruding length than the inner rib 20b, and the inclined rib 20c has an end surface in the protruding direction. However, the side that is connected and integrated with the outer end rib 20a has a short projecting length and is inclined so that the projecting length becomes longer toward the inner rib 20b side.

内側リブ２０ｂには交差リブ７の端部が一体に連結してある。   The end of the cross rib 7 is integrally connected to the inner rib 20b.

そして、本発明においては、複数の連結リブ６のうち少なくとも２つ以上の連結リブ６が桁部２間にわたって第１の成形材料９により形成してあると共に当該桁部２間にわたって第１の成形材料９により形成してある２つ以上の連結リブ６の周壁部５との各連結部分及び該連結部分に隣接する桁部内リブ８の一部が第１の成形材料９により形成してある。更に、交差リブ７の一部が第１の成形材料９により形成してある。また、パレット４の上記第１の成形材料９で形成した部分を除く他の部分が第２の成形材料１０で成形してある。   In the present invention, at least two or more connecting ribs 6 among the plurality of connecting ribs 6 are formed of the first molding material 9 between the beam portions 2 and the first molding is performed between the beam portions 2. Each of the connecting portions of the two or more connecting ribs 6 formed of the material 9 with the peripheral wall portion 5 and a part of the girder inner rib 8 adjacent to the connecting portion are formed of the first molding material 9. Furthermore, a part of the cross rib 7 is formed by the first molding material 9. Further, the other part of the pallet 4 except the part formed with the first molding material 9 is molded with the second molding material 10.

なお、図３乃至図８において第１の成形材料９で形成した部分は点描で表している。   In addition, in FIG. 3 thru | or FIG. 8, the part formed with the 1st molding material 9 is represented by pointillism.

上記第１の成形材料９は第２の成形材料１０よりも曲げ強度の強い成形材料である。例えば、第２の成形材料９としては通常のポリプロピレンが使用され、第１の成形材料９としては上記通常のポリプロピレンよりも曲げ強度が強い物性のポリプロピレンや、あるいは、通常のポリプロピレンにタルクを添加した成形材料を使用して成形してある。また、第１の成形材料９としてはバージン材を用いるが、第２の成形材料１０としてはバージン、再生材のいずれであってもよい。   The first molding material 9 is a molding material having a bending strength stronger than that of the second molding material 10. For example, normal polypropylene is used as the second molding material 9, and as the first molding material 9, physical property polypropylene having higher bending strength than the above-mentioned normal polypropylene, or talc is added to normal polypropylene. Molded using a molding material. In addition, a virgin material is used as the first molding material 9, but the second molding material 10 may be either virgin or a recycled material.

曲げ強度の強い成形材料である第１の成形材料９はタルクを添加したりして高価で流動性が悪いが、本発明は、上記のように、複数の連結リブ６のうち少なくとも２つ以上の連結リブ６を桁部２間にわたって第１の成形材料９により形成し、また、当該桁部２間にわたって第１の成形材料９により形成してある２つ以上の連結リブ６の周壁部５との各連結部分及び該連結部分に隣接する桁部内リブ８の一部が第１の成形材料９により形成し、また、交差リブ７の一部が第１の成形材料９により形成する。このように、パレット４における第１の成形材料９により成形する部位が部分的であるため、第１の成形材料９の使用量を少なくすることができ、コストが高くなるのを抑え、且つ、成形性の低下も防止できる。また、図５のように、デッキ部１の全部が第２の成形材料１０で形成してあると、よりいっそう第１の成形材料９の使用量を少なくすることができる。   The first molding material 9, which is a molding material having a high bending strength, is expensive and poor in fluidity due to the addition of talc. However, as described above, in the present invention, at least two or more of the plurality of connecting ribs 6 are used. The connecting ribs 6 are formed of the first molding material 9 between the beam portions 2, and the peripheral wall portions 5 of the two or more connecting ribs 6 are formed of the first molding material 9 between the beam portions 2. Each of the connecting portions and a part of the girder inner rib 8 adjacent to the connecting portion are formed of the first molding material 9, and a part of the cross rib 7 is formed of the first molding material 9. Thus, since the site | part shape | molded by the 1st molding material 9 in the pallet 4 is partial, the usage-amount of the 1st molding material 9 can be decreased, it suppresses that cost becomes high, and A decrease in moldability can also be prevented. Further, as shown in FIG. 5, when the entire deck portion 1 is formed of the second molding material 10, the usage amount of the first molding material 9 can be further reduced.

なお、タルクを添加することによって重量が増すものの、少量使用するに過ぎないので、それほど重くならない。また、パレット４の桁部２間を繋ぐ連結リブ６を、曲げ強度の強い成形材料である第１の成形材料９で成形してあるので、自動倉庫においてパレット４を取り扱う際に、最も曲げ強度を必要とする箇所は、桁部２間を繋ぐ部位であるため、この部分に設けた連結リブ６を重点的に補強することで、全体として曲げ強度の強い成形材料の使用料を少なくして高い曲げ強度を有するパレット４を提供できることになる。   In addition, although the weight increases by adding talc, it is not so heavy because it is used only in a small amount. In addition, since the connecting rib 6 that connects the beam portions 2 of the pallet 4 is formed of the first molding material 9 that is a molding material having a high bending strength, the bending strength is the highest when the pallet 4 is handled in an automatic warehouse. Is a part that connects between the girder parts 2, and by reinforcing the connecting rib 6 provided in this part intensively, the usage fee of the molding material having high bending strength as a whole is reduced. The pallet 4 having high bending strength can be provided.

ここで、本発明においては、複数の連結リブ６のうち少なくとも２つ以上の連結リブ６が桁部２間にわたって第１の成形材料９により形成してあり、この桁部２間にわたって第１の成形材料９により成形された２つ以上の連結リブ６は周壁部５との各連結部分及び該連結部分に隣接する桁部内リブ８の一部が第１の成形材料９により一体に形成することで、桁部２間を連結する曲げ強度の強い第１の成形材料９よりなる連結リブ６を曲げ強度の強い第１の成形材料９で成形した上記連結部分５ａ及び桁部内リブ８の一部で補強しながら曲げに対する強度を強くすることができる。   Here, in the present invention, at least two or more connecting ribs 6 among the plurality of connecting ribs 6 are formed of the first molding material 9 across the beam portions 2, and the first molding material 9 extends between the beam portions 2. The two or more connecting ribs 6 formed by the molding material 9 are formed integrally with each connecting portion with the peripheral wall portion 5 and a part of the girder inner rib 8 adjacent to the connecting portion by the first molding material 9. Thus, the connecting portion 5a formed of the first molding material 9 having a high bending strength and the connecting rib 5 made of the first molding material 9 having a high bending strength for connecting the beam portions 2 and a part of the rib 8 in the girder portion. The strength against bending can be increased while reinforcing with.

そして、本発明においては、このように桁部２間を連結する曲げ強度の強い第１の成形材料９よりなる連結リブ６を曲げ強度の強い第１の成形材料９で成形した上記連結部分５ａ及び桁部内リブ８の一部で補強しながら曲げに対する強度を強くしたものにおいて、更に、上記複数の桁部内リブ８における上記第１の成形材料９と第２の成形材料１０との境界部分５０を、フォーク挿入方向と直交する方向においてずらしたことに構造上の特徴がある。つまり、図４における寸法Ｌ１、Ｌ２…Ｌｎが異ならせてある。したがって、フォーク挿入部３にフォークを挿入してフォークで持ち上げた場合、パレット４に上方から大きな荷重がかかっても、第１の成形材料９と第２の成形材料１０との境界部分５０を基点として曲がるのが防止され、パレット４の破損を防止することができる。 And in this invention, the said connection part 5a which shape | molded the connection rib 6 which consists of the 1st molding material 9 with strong bending strength which connects between the girder parts 2 in this way with the 1st molding material 9 with strong bending strength. Further, in the case where the strength against bending is increased while reinforcing with a part of the rib 8 in the spar portion, the boundary portion 50 between the first molding material 9 and the second molding material 10 in the plurality of spar inner ribs 8 is further provided. Is characterized in that it is shifted in a direction perpendicular to the fork insertion direction. That is, the dimensions L 1 , L 2 ... L n in FIG. Therefore, when the fork is inserted into the fork insertion portion 3 and lifted by the fork, even if a large load is applied to the pallet 4 from above, the boundary portion 50 between the first molding material 9 and the second molding material 10 is the base point. As a result, the pallet 4 can be prevented from being damaged.

また、第１の成形材料９で形成した部分のパレット４の外側端部側の端部がパレット４の外側端部よりも内側にずれた位置であるため、パレット４の外側端部に第１の成形材料９が露出することがなく、したがって、第１の成形材料９として曲げ強度は強いが耐衝撃性の劣る成形材料を使用しても、フォークの先端などがパレット４の外側端部に衝突したり、パレット４が落下したりして外側端部に衝撃が加わっても破損し難いものである。また、図５のように、デッキ部１の全部が第２の成形材料１０で成形してあるので、デッキ部１に上方からかかる衝撃に対して強くなる。   In addition, since the end of the portion formed of the first molding material 9 on the outer end side of the pallet 4 is shifted to the inner side with respect to the outer end of the pallet 4, the first end is positioned at the outer end of the pallet 4. Therefore, even if a molding material having high bending strength but inferior impact resistance is used as the first molding material 9, the tip of the fork is placed on the outer end of the pallet 4. Even if it collides or the pallet 4 falls and an impact is applied to the outer end, it is difficult to break. Further, as shown in FIG. 5, since the entire deck portion 1 is formed of the second molding material 10, the deck portion 1 becomes strong against an impact applied from above.

連結リブ６を２本以上、特に３本以上形成するときには、桁部２の先端部に第１の成形材料９を効率よく充填するために、複数の連結リブ６間の略中央の位置に第１の成形材料９のゲートを形成する。つまり、第１の成形材料９の充填バランスが悪いと桁部２の周壁部５の先端部に第１の成形材料９が流れ難くなり、第１の成形材料９が充填されない空間が形成されて、上半体４ａと下半体４ｂとを溶着しても隙間ができて水が入ることになる。また、隙間がないように第１の成形材料９を充填しようとすると、必要以上のところに充填されて、高価で重いパレット４となる。   When two or more connecting ribs 6 are formed, particularly three or more, in order to efficiently fill the first molding material 9 at the distal end portion of the spar 2, the first rib 9 is formed at a substantially central position between the plurality of connecting ribs 6. 1 of the molding material 9 is formed. That is, if the filling balance of the first molding material 9 is poor, the first molding material 9 does not flow easily at the distal end portion of the peripheral wall portion 5 of the girder 2, and a space not filled with the first molding material 9 is formed. Even if the upper half 4a and the lower half 4b are welded, a gap is formed and water enters. Further, if the first molding material 9 is to be filled so that there is no gap, the pallet 4 becomes expensive and heavy due to filling more than necessary.

また、複数の連結リブ６の中央になる連結リブ６を他の連結リブ６よりも肉厚にして桁部２に第１の成形材料９を素早く充填し、この充填された第１の成形材料９が山形形状をした波紋のように広がっていくのでウエルドラインも発生しにくくてよい。   Further, the connecting rib 6 that becomes the center of the plurality of connecting ribs 6 is made thicker than the other connecting ribs 6, and the first molding material 9 is quickly filled in the girders 2, and the filled first molding material is filled. Since 9 spreads like a ripple in the shape of a mountain, a weld line may not easily occur.

次に、本発明のパレット４（実施形態では上半体４ａや下半体４ｂ）を第１の成形材料９、第２の成形材料１０を用いて成形する例につき説明する。   Next, an example in which the pallet 4 of the present invention (in the embodiment, the upper half 4a and the lower half 4b) is molded using the first molding material 9 and the second molding material 10 will be described.

例えば、パレット４の上半体４ａ（又は下半体４ｂ）を成形金型で成形する際、図７（ａ）に示すように、成形金型は、固定型９０、可動型９１、内部移動型９２により構成してあり、内部移動型９２を矢印のように突出させて、固定型９０と可動型９１とで構成するキャビティ６０内に内部移動型９２を突出させて、該突出した内部移動型９２によりデッキ部形成用キャビティ部８０の一部を塞ぐ。この状態で、第１の成形材料９を供給するゲートから第１の成形材料９を供給し、連結リブ形成用キャビティ部７１、これに続いて周壁形成用キャビティ部７２の一部、これに続いて、桁部内リブ形成用キャビティ部７３の一部に第１の成形材料９を供給する。この場合、交差リブ用キャビティ部７０の一部にも第１の成形材料９が供給される。   For example, when the upper half 4a (or the lower half 4b) of the pallet 4 is molded with a molding die, as shown in FIG. 7A, the molding die includes a fixed die 90, a movable die 91, and an internal movement. The inner moving mold 92 is protruded as shown by an arrow, and the inner moving mold 92 is protruded into the cavity 60 formed by the fixed mold 90 and the movable mold 91. A part of the cavity portion 80 for forming the deck portion is closed by the mold 92. In this state, the first molding material 9 is supplied from the gate for supplying the first molding material 9, and the connecting rib forming cavity portion 71, followed by a part of the peripheral wall forming cavity portion 72, followed by this. Thus, the first molding material 9 is supplied to a part of the cavity portion 73 for forming the ribs in the spar portion. In this case, the first molding material 9 is also supplied to a part of the intersecting rib cavity portion 70.

次に、図７（ｂ）の矢印のように内部移動型９２を後退させ、キャビティ６０の上記第１の成形材料９を供給した部分を除く残りの部分に第２の成形材料１０を供給する上記とは別のゲートから第２の成形材料１０を供給して充填する。   Next, as shown by the arrow in FIG. 7B, the internal movement die 92 is retracted, and the second molding material 10 is supplied to the remaining part of the cavity 60 except for the part where the first molding material 9 is supplied. The second molding material 10 is supplied and filled from a gate different from the above.

上記先に供給された第１の成形材料９と、後で供給された第２の成形材料１０との境界部分５０では両者が合流一体化する。そして、本発明においては、複数の桁部内リブ８における上記第１の成形材料と第２の成形材料との境界部分５０が、フォーク挿入方向と直交する方向においてずれている。   In the boundary portion 50 between the first molding material 9 supplied earlier and the second molding material 10 supplied later, both merge and integrate. In the present invention, the boundary portions 50 between the first molding material and the second molding material in the plurality of girder inner ribs 8 are displaced in the direction perpendicular to the fork insertion direction.

なお、桁部内リブ８の上記境界部分５０におけるフォーク挿入方向と直交する方向の断面形状を非長方形又は非正方形として同一断面内に肉厚の厚い厚肉部と薄い薄肉部とを備える構造とすると、厚肉部においては、第１の成形材料９が薄肉部よりもより遠くまで流れて成形されることになり、従って、境界部分５０がフォーク挿入方向と直交しておらず、この点でもよりいっそうパレット４に上方から大きな荷重がかかっても、第１の成形材料９と第２の成形材料１０との境界部分５０を基点として曲がるのが防止され、パレット４の破損を防止することができる。   The cross-sectional shape in the direction perpendicular to the fork insertion direction at the boundary portion 50 of the rib 8 in the girder portion is a non-rectangular shape or a non-square shape, and has a thick thick portion and a thin thin portion in the same cross section. In the thick portion, the first molding material 9 flows and is formed farther than the thin portion. Therefore, the boundary portion 50 is not orthogonal to the fork insertion direction. Even when a large load is applied to the pallet 4 from above, the pallet 4 can be prevented from bending with the boundary portion 50 between the first molding material 9 and the second molding material 10 as a base point, and damage to the pallet 4 can be prevented. .

上記実施形態においては、デッキ部１を面板部１ｃにより構成し、この面板部１ｃの裏面に筒状をした桁部２を突設し、更に、面板部１ｃの裏面には桁部２間に複数の連結リブ６、連結リブ６と交差する交差リブ７を突設した例を示したが、デッキ部１の一部又は全部がリブ１ｄにより形成してあるものであってもよく、この場合、図８のように、桁部２間においては連結リブ６、交差リブ７がデッキ部１の一部を構成するリブ１ｄであってもよい。   In the said embodiment, the deck part 1 is comprised by the faceplate part 1c, the cylindrical girder part 2 is protrudingly provided in the back surface of this faceplate part 1c, and also the back surface of the faceplate part 1c is provided between the girder parts 2. Although the example which protruded the some connecting rib 6 and the cross rib 7 which cross | intersects the connecting rib 6 was shown, the one part or all part of the deck part 1 may be formed with the rib 1d. As shown in FIG. 8, the connecting rib 6 and the intersecting rib 7 may be ribs 1 d constituting a part of the deck portion 1 between the beam portions 2.

このように桁部２間においては連結リブ６、交差リブ７がデッキ部１の一部を構成するリブ１ｄを構成するものにおいては、成形金型として固定型９０、可動型９１により構成したものを用いることができ、前述の実施形態のように、固定型９０、可動型９１内部移動型９２により構成した成形金型を用いるものに比べて成形金型の構成が簡略化できる。   As described above, the connecting ribs 6 and the cross ribs 7 constituting the rib 1d constituting a part of the deck portion 1 between the girders 2 are constituted by a fixed die 90 and a movable die 91 as molding dies. The configuration of the molding die can be simplified as compared to the configuration using the molding die constituted by the fixed die 90 and the movable die 91 and the internal moving die 92 as in the above-described embodiment.

なお、前述の実施形態ではデッキ部１を面板部１ｃで構成したものにおいて、デッキ部１の桁部２間の部位において厚み方向の全部又は一部を連結リブ６などと同じように第１の成形材料９で形成し、桁部２間において連結リブ６、交差リブ７、デッキ部１が第１の成形材料９で一体化したものであってもよい。   In the above-described embodiment, the deck portion 1 is constituted by the face plate portion 1c. In the portion between the beam portions 2 of the deck portion 1, all or part of the thickness direction is the same as the connecting rib 6 or the like. The connecting rib 6, the cross rib 7, and the deck portion 1 may be integrated with the first molding material 9 between the beam portions 2.

本発明のパレットにおける上半体（又は下半体）の斜視図である。It is a perspective view of the upper half (or lower half) in the pallet of the present invention. 同上のパレットの斜視図である。It is a perspective view of a pallet same as the above. 同上の要部拡大斜視図である。It is a principal part expansion perspective view same as the above. 同上の要部平面図である。It is a principal part top view same as the above. （ａ）は同上の断面図、（ｂ）は同上の要部拡大断面図である。(A) is sectional drawing same as the above, (b) is the principal part expanded sectional view same as the above. 同上の桁部内リブの破断斜視図である。It is a fracture | rupture perspective view of the rib in a girder part same as the above. （ａ）は成形金型のキャビティに第１の成形材料を供給した状態を示す説明のための断面図であり、（ｂ）は第１の成形材料を供給した後で第２の成形材料を供給した状態を示す説明のための断面図である。(A) is sectional drawing for description which shows the state which supplied the 1st molding material to the cavity of a shaping die, (b) is a 2nd molding material after supplying a 1st molding material. It is sectional drawing for description which shows the supplied state. 本発明の他の実施形態を示し、デッキ部をリブで形成した例の断面図である。It is sectional drawing of the example which showed other embodiment of this invention and formed the deck part with the rib.

符号の説明Explanation of symbols

１ デッキ部
２ 桁部
３ フォーク挿入部
４ パレット
５ 周壁部
５ａ 連結部分
６ 連結リブ
７ 交差リブ
８ 桁部内リブ
９ 第１の成形材料
１０ 第２の成形材料
５０ 境界部分 DESCRIPTION OF SYMBOLS 1 Deck part 2 Girder part 3 Fork insertion part 4 Pallet 5 Peripheral wall part 5a Connection part 6 Connection rib 7 Cross rib 8 Girder part inner rib 9 1st molding material 10 2nd molding material 50 Boundary part

Claims (1)

デッキ部と、複数の桁部とを備え、桁部間がフォーク挿入部となった合成樹脂製のパレットにおいて、該筒状をした桁部の周壁部間に桁部間を連結する複数の連結リブを設けると共に連結リブと交差する交差リブを設け、桁部の周壁部の内面に複数の桁部内リブを設け、複数の連結リブのうち少なくとも２つ以上の連結リブが桁部間にわたって第１の成形材料により形成してあると共に当該桁部間にわたって第１の成形材料により形成してある２つ以上の連結リブの周壁部との各連結部分及び該連結部分に隣接する桁部内リブの一部が第１の成形材料により形成してあり、更に、交差リブの一部が第１の成形材料により形成してあり、パレットの第１の成形材料により形成された部分を除く部分が第２の成形材料により形成してあり、上記第１の成形材料が第２の成形材料よりも曲げ強度の強い成形材料であり、複数の桁部内リブにおける上記第１の成形材料と第２の成形材料との境界部分が、フォーク挿入方向と直交する方向においてずれていることを特徴とする合成樹脂製のパレット。   In a synthetic resin pallet having a deck portion and a plurality of girders, and between the girders being a fork insertion portion, a plurality of couplings for coupling the girders between the peripheral wall portions of the cylindrical girder A rib is provided and an intersecting rib that intersects with the connecting rib is provided, and a plurality of inner ribs are provided on the inner surface of the peripheral wall portion of the girders, and at least two of the plural connecting ribs are first between the girders. Each of the connecting portions with the peripheral wall portions of two or more connecting ribs that are formed of the first molding material and between the girder portions, and one of the ribs in the girder portion adjacent to the connecting portions. The portion is formed of the first molding material, and further, a part of the cross rib is formed of the first molding material, and the portion excluding the portion formed of the first molding material of the pallet is the second. The molding material is Is a molding material whose bending strength is stronger than that of the second molding material, and the boundary portions between the first molding material and the second molding material in the plurality of girder inner ribs are orthogonal to the fork insertion direction. A pallet made of synthetic resin characterized by being displaced in the direction.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011111173A (en) * 2009-11-25 2011-06-09 Sanko Co Ltd Resin pallet
JP2013023258A (en) * 2011-07-21 2013-02-04 Panasonic Corp Resin pallet
JP2014055001A (en) * 2012-09-11 2014-03-27 Sanko Co Ltd Palette

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5746811A (en) * 1980-06-07 1982-03-17 Hashimoto Forming Co Ltd Jointed two-colored molded article and manufacture thereof
JPH0416141U (en) * 1990-05-30 1992-02-10
JPH09226767A (en) * 1995-12-18 1997-09-02 Nippon Puraparetsuto Kk Pallet made of synthetic resin
JP2002068188A (en) * 2000-08-24 2002-03-08 Sanko Co Ltd Synthetic resin pallet
JP2005145566A (en) * 2005-01-25 2005-06-09 Meiji Rubber & Chem Co Ltd Synthetic resin-made pallet
JP2005219754A (en) * 2004-02-03 2005-08-18 Sanko Co Ltd Synthetic resin-made pallet
JP2007186244A (en) * 2006-01-13 2007-07-26 Gifu Plast Ind Co Ltd Synthetic resin pallet

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5746811A (en) * 1980-06-07 1982-03-17 Hashimoto Forming Co Ltd Jointed two-colored molded article and manufacture thereof
JPH0416141U (en) * 1990-05-30 1992-02-10
JPH09226767A (en) * 1995-12-18 1997-09-02 Nippon Puraparetsuto Kk Pallet made of synthetic resin
JP2002068188A (en) * 2000-08-24 2002-03-08 Sanko Co Ltd Synthetic resin pallet
JP2005219754A (en) * 2004-02-03 2005-08-18 Sanko Co Ltd Synthetic resin-made pallet
JP2005145566A (en) * 2005-01-25 2005-06-09 Meiji Rubber & Chem Co Ltd Synthetic resin-made pallet
JP2007186244A (en) * 2006-01-13 2007-07-26 Gifu Plast Ind Co Ltd Synthetic resin pallet

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011111173A (en) * 2009-11-25 2011-06-09 Sanko Co Ltd Resin pallet
JP2013023258A (en) * 2011-07-21 2013-02-04 Panasonic Corp Resin pallet
JP2014055001A (en) * 2012-09-11 2014-03-27 Sanko Co Ltd Palette

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