JP4031208B2

JP4031208B2 - 2-way synthetic resin pallet

Info

Publication number: JP4031208B2
Application number: JP2001059593A
Authority: JP
Inventors: 宏司大崎
Original assignee: Sanko Co Ltd
Current assignee: Sanko Co Ltd
Priority date: 2001-03-05
Filing date: 2001-03-05
Publication date: 2008-01-09
Anticipated expiration: 2021-03-05
Also published as: JP2002255176A

Description

【０００１】
【発明の属する技術分野】
本発明は、物品を載置して運搬、保管等に供される２方差し合成樹脂製パレットに関するものである。
【０００２】
【従来の技術】
従来、荷物が載置される載置面１ａを有するデッキボード１と、デッキボード１の相対する一方の辺に沿って形成された筒状の側部桁部２ａと、相対する側部桁部２ａの中間部に、側部桁部２ａに略平行に形成された筒状の中間桁部３ａとからなるスキッドＳ’を、射出成形等により成形し、このような構成を有する２枚のスキッドＳ’の互いの側部桁部２ａの端部同士及び中間桁部３ａの端部同士を溶着することにより製造された、図５に示されているような、２方差し合成樹脂製パレットが知られている。このようにして製造された２方差し合成樹脂製パレットは、端部同士が溶着された側部桁部２ａにより、側部桁２が形成されており、また、端部同士が溶着された中間桁部３ａにより、中間桁３が形成されているとともに、側部桁２と中間桁３との間に、２つのフォーク差込孔４が形成されている。
【０００３】
また、側部桁２内及び中間桁３内には、側部桁２及び中間桁３の長手方向（フォーク差込孔４の長手方向）に沿って、側部桁２内及び中間桁３内を区画するように、長さ方向に対して垂直な断面形状が、細長い略長方形状の区画リブ２ｂ、リブ３ｂが形成されている。
【０００４】
【発明が解決しようとする課題】
上述した従来の２方差し合成樹脂製パレットは、側部桁２及び中間桁３の長手方向（フォーク差込孔４の長手方向）に沿った剛性や強度が充分でないために、２方差し合成樹脂製パレットの耐用年数が短いという問題があった。
【０００５】
また、従来の２方差し合成樹脂製パレットにおいては、スキッドＳ’状態のデッキボード１の肉厚ｄ１に比べて、区画リブ２ｂ、リブ３ｂの先端の肉厚ｄ２が厚いために、射出成形後の冷却過程における収縮差が大きく、従って、デッキボード１が山なり状に変形するという問題があった。
【０００６】
更に、合成樹脂製パレットを軽量化するために、リブの肉厚を薄くすることも、通常、行われていることであるが、しかし、リブの肉厚を薄くすると、合成樹脂製パレットの強度や剛性が低下するという問題があった。
【０００７】
本発明の目的は、上述した従来の２方差し合成樹脂製パレットが有する課題を解決することにある。
【０００８】
【課題を解決するための手段】
本発明は、上述した目的を達成するために、デッキボードと該デッキボードの相対する一方の辺に沿って形成された細長の筒状の側部桁部と、該側部桁部の中間部に、側部桁部に略平行に形成された細長の筒状の中間桁部とを有する２枚のスキッドの側部桁部の端部同士及び中間桁部の端部同士を、それぞれ、溶着することにより製造される２方差し合成樹脂製パレットにおいて、前記側部桁部の周壁部の相対する短辺が、前記周壁部と同じ高さを有する長辺連結リブ部で連結されているとともに、前記長辺連結リブ部が、前記デッキボードから所定の長さに亘たって、肉厚が略一定の状態で延在する厚肉部と、該肉厚部より薄く、且つ、前記デッキボードの肉厚と略同じ肉厚が略一定の状態で延在する薄肉部とから形成されており、同様に、前記中間桁部の周壁部の相対する短辺が、前記周壁部と同じ高さを有する長辺連結リブ部で連結されているとともに、前記長辺連結リブ部が、前記デッキボードから所定の長さに亘たって、肉厚が略一定の状態で延在する厚肉部と、該厚肉部より薄く、且つ、前記デッキボードの肉厚と略同じ肉厚が略一定の状態で延在する薄肉部とから形成されており、２枚のスキッドの側部桁部の端部同士及び中間桁部の端部同士が溶着される際には、前記側部桁部の長辺連結リブ部の端部同士及び前記中間桁部の長辺連結リブ部の端部同士が、それぞれ、溶着されるように構成されているものである。
【０００９】
【実施例】
図１〜図３を用いて、本発明の２方差し合成樹脂製パレットの一実施例について説明するが、本発明の趣旨を超えない限り何ら、本実施例に限定されるものではない。
【００１０】
Ｓは、射出成形された状態のスキッドであり、上述した従来のスキッドＳ’と同様に、スキッドＳは、デッキボード１０と、デッキボード１０の相対する一方の辺に沿って形成された細長の筒状の側部桁部１１ａと、相対する側部桁部１１ａの中間部に、側部桁部１１ａに略平行に形成された同じく遅長の筒状の中間桁部１２ａとを有している。
【００１１】
側部桁部１１ａは、周壁部１３ａと、周壁部１３ａの相対する短辺１３ａ１を連結する周壁部１３ａと同じ高さを有する長辺連結リブ部１４ａと、周壁部１３ａの相対する長辺１３ａ２を連結する周壁部１３ａと同じ高さを有するとともに、所定の間隔を置いて配置された短辺連結リブ部１５ａとを有している。本実施例においては、１本の長辺連結リブ部１４ａが示されているが、所定の間隔を置いて、複数本の長辺連結リブ部１４ａを形成することもできる。なお、１６ａは、短辺連結リブ部１５ａ間に位置する周壁１３ａａ及びデッキボード１０の裏面に、短辺連結リブ部１５ａに沿って、必要に応じて、形成された高さの低い補強リブ部である。
【００１２】
中間桁部１２ａは、周壁部１７ａと、周壁部１７ａの相対する短辺１７ａ１を連結する周壁部１７ａと同じ高さを有するとともに、所定の間隔を置いて配置された長辺連結リブ部１８ａと、周壁部１７ａの相対する長辺１７ａ２を連結する周壁部１７ａと同じ高さを有するとともに、所定の間隔を置いて配置された短辺連結リブ部１９ａとを有している。本実施例においては、２本の長辺連結リブ部１８ａが示されているが、３本以上の長辺連結リブ部１８ａを形成することもできる。なお、２０ａは、短辺連結リブ部１９ａ間に位置する周壁部１７ａ及びデッキボード１０の裏面に、短辺連結リブ部１９ａに沿って、必要に応じて、形成された高さの低い補強リブ部である。
【００１３】
側部桁部１１ａと中間桁部１２ａとの間に位置するデッキボード１０の裏面には、縦横に走るとともに、周壁部１３ａ、１７ａより高さの低い補強リブ２１が形成されており、側部桁部１１ａと中間桁部１２ａとの間に形成される凹部２２ａにより、フォーク差込口２２が形成されることになる。なお、本実施例のデッキボード１０の周壁には、側部桁部１１ａの周壁１３ａ及び中間桁部１２ａの周壁１７ａより、若干、突出した張出部１０ａが形成されている。
【００１４】
上述したような構成を有する２枚のスキッドＳの互いの側部桁部１１ａの端部同士及び中間桁部１２ａの端部同士を溶着することにより、図３に示されているような、２方差し合成樹脂製パレットが製造される。このようにして製造された２方差し合成樹脂製パレットは、端部同士が溶着された側部桁部１１ａにより、側部桁１１が形成されており、また、端部同士が溶着された中間桁部１２ａにより、中間桁１２が形成されているとともに、側部桁１１と中間桁１２との間に、２つのフォーク差込孔２２が形成されている。なお、２枚のスキッドＳの互いの側部桁部１１ａの端部同士の溶着により、周壁部１３ａからなる側部桁１１の周壁１３が形成され、また、同様に、２枚のスキッドＳの互いの中間桁部１２ａの端部同士の溶着により、周壁部１７ａからなる中間桁１２の周壁１７が形成されることになる。
【００１５】
２枚のスキッドＳの側部桁部１１ａ内に形成された長辺連結リブ部１４ａの端部同士も溶着されており、長辺連結リブ部１４ａの端部同士の溶着により、側部桁１１内を区画する長辺連結リブ１４が形成され、同様に、２枚のスキッドＳの短辺連結リブ部１５ａの端部同士も溶着されており、短辺連結リブ部１５ａの端部同士の溶着により、側部桁１１内を区画する短辺連結リブ１５が形成されることになる。また、２枚のスキッドＳの中間桁部１２ａ内に形成された長辺連結リブ部１８ａの端部同士も溶着されており、長辺連結リブ部１８ａの端部同士の溶着により、中間桁１２内を区画する長辺連結リブ１８が形成され、同様に、２枚のスキッドＳの短辺連結リブ部１９ａの端部同士も溶着されており、短辺連結リブ部１９ａの端部同士の溶着により、中間桁１２内を区画する短辺連結リブ１９が形成されることになる。
【００１６】
本実施例においては、スキッドＳ状態において、側部桁部１１ａ内に形成された長辺連結リブ部１４ａは、デッキボード１０から所定の長さ（高さ方向）、肉厚ｄ３が略一定の状態で延在する厚肉部１４ａ１と、厚肉部１４ａ１の中央部から延在するとともに、厚肉部１４ａ１より薄い肉厚ｄ４で、且つ、肉厚ｄ４が略一定の状態で延在する薄肉部１４ａ２とから形成されている。同様に、スキッドＳ状態において、中間桁部１２ａ内に形成された長辺連結リブ部１８ａは、デッキボード１０から所定の長さ（高さ方向）、肉厚ｄ５が略一定の状態で延在する厚肉部１８ａ１と、厚肉部１８ａ１の中央部から延在するとともに、厚肉部１８ａ１より薄い肉厚ｄ６で、且つ、肉厚ｄ６が略一定の状態で延在する薄肉部１８ａ２とから形成されている。従って、２枚のスキッドＳが溶着され、製造された合成樹脂製パレットの側部桁１１内を区画する長辺連結リブ１４及び中間桁１２内を区画する長辺連結リブ１８は、デッキボード１０側に位置する厚肉部１４ａ１、１８ａ１と、デッキボード１０側に位置する厚肉部１４ａ１、１８ａ１間に位置する、薄肉部１４ａ２、１８ａ２とから形成されることになり、長辺連結リブ１４、１８の長手方向に垂直な断面形状は、略鼓状に形成されている。このような形成とすることにより、従来の２方差し合成樹脂製パレットの断面形状が細長い略長方形状の区画リブ２ｂ、リブ３ｂに比べて、断面係数及び断面二次モーメントが大きくなり、従って、合成樹脂製パレットの重量が同じで、且つ、従来の区画リブ２ｂ、リブ３ｂと本実施例の長辺連結リブ１４、１８との断面積が同じ場合には、従来の２方差し合成樹脂製パレットより、２方差し合成樹脂製パレットの側部桁１１及び中間桁１２の長手方向に沿った剛性や強度が大きくなり、２方差し合成樹脂製パレットの耐用年数が長くなる。換言すれば、従来の２方差し合成樹脂製パレットと同等の剛性及び強度があれば充分である場合には、２方差し合成樹脂製パレットの重量を軽量化することができる。
【００１７】
また、上述したように、スキッドＳの側部桁部１１ａ内に形成された長辺連結リブ部１４ａの先端部に位置する薄肉部１４ａ２の肉厚ｄ４が、長辺連結リブ部１４ａの根元部分に位置する厚肉部１４ａ１の肉厚ｄ３より薄く形成されており、薄肉部１４ａ２の肉厚ｄ４を、デッキボード１０の肉厚と略同じに構成することができるので、スキッドＳ’状態のデッキボード１の肉厚ｄ１に比べて、区画リブ２ｂ、リブ３ｂの先端の肉厚ｄ２が厚い従来の２方差し合成樹脂製パレットのように、スキッドの射出成形後の冷却に起因するデッキボード１０の山なり状の変形を防止することができる。
【００１８】
上述した実施例には、側部桁１１内を区画する長辺連結リブ１４及び中間桁１２内を区画する長辺連結リブ１８の断面形状を、略鼓状に形成した構成に加えて、２枚のスキッドＳの互いの側部桁部１１ａの端部同士の溶着により形成される側部桁１１の周壁１３のうち、フォーク差込口２２側に位置する長辺側周壁１３’の断面形状を、側部桁１１内を区画する長辺連結リブ１４及び中間桁１２内を区画する長辺連結リブ１８の断面形状と同様に、略鼓状に形成することにより、更に、２方差し合成樹脂製パレットの剛性や強度を大きくすることができる。また、２枚のスキッドＳの互いの中間部１２ａの端部同士の溶着により形成される中間桁１２の周壁１７のうち、フォーク差込口２２側に位置する長辺側周壁１７’の断面形状を、側部桁１１内を区画する長辺連結リブ１４及び中間桁１２内を区画する長辺連結リブ１８の断面形状と同様に、略鼓状に形成することにより、２方差し合成樹脂製パレットの剛性や強度をより大きくすることができる。更に、２枚のスキッドＳの互いの側部桁部１１ａの端部同士の溶着により形成される側部桁１１の周壁１３のうち、フォーク差込口２２の反対側に位置する長辺側周壁１３”の断面形状を、側部桁１１内を区画する長辺連結リブ１４及び中間桁１２内を区画する長辺連結リブ１８の断面形状と同様に、略鼓状に形成することにより、２方差し合成樹脂製パレットの剛性や強度を更に大きくすることができる。
【００１９】
上述したように、少なくとも、桁１１、１８内を区画する長辺連結リブ１４、１８が、デッキボード１０から所定の長さ（高さ方向）、肉厚ｄ３、ｄ５が略一定の状態で延在する厚肉部１４ａ１、１８ａ１と、該厚肉部１４ａ１、１８ａ１間に位置するとともに、上記肉厚ｄ３、ｄ５より薄い肉厚ｄ４、ｄ６が略一定の状態で延在する薄肉部１４ａ２、１８ａ２とから形成され、その断面形状が、略鼓状に形成されているので、２方差し合成樹脂製パレットの剛性や強度が大きくなり、従って、２方差し合成樹脂製パレットの耐用年数が長くなる。
【００２０】
【発明の効果】
本発明は、以上説明した構成を有しているので、以下に記載する効果を奏するものである。
【００２１】
少なくとも、桁内を区画する長辺連結リブが、デッキボードから所定の長さ、肉厚が略一定の状態で延在する厚肉部と、該厚肉部間に位置するとともに、上記肉厚より薄い肉厚が略一定の状態で延在する薄肉部とから形成されているので、２方差し合成樹脂製パレットの剛性や強度を大きくすることができ、従って、２方差し合成樹脂製パレットの耐用年数を長くすることができる。
【００２２】
また、スキッドの桁部内に形成された長辺連結リブ部の先端部の肉厚を、長辺連結リブ部の根元部分の肉厚より薄く形成したので、スキッドの射出成形後の冷却に起因するデッキボードの山なり状の変形を防止することができる。
【図面の簡単な説明】
【図１】図１は本発明の２方差し合成樹脂製パレットを構成するスキッドの斜視図である。
【図２】図２は図１に示されているスキッドの部分拡大斜視図である。
【図３】図３は本発明の２方差し合成樹脂製パレットのフォーク差込孔に直交する部分垂直断面図である。
【図４】図４は本発明の別の実施例の２方差し合成樹脂製パレットのフォーク差込孔に直交する部分垂直断面図である。
【図５】図５は従来の２方差し合成樹脂製パレットの斜視図である。
【図６】図６は図５のＩ−Ｉ線に沿った垂直断面図である。
【符号の説明】
Ｓ・・・・・・・・・・・・・スキッド
１１・・・・・・・・・・・・側部桁
１２・・・・・・・・・・・・中間桁
１４、１８・・・・・・・・・長辺連結リブ
１４ａ、１８ａ・・・・・・・長辺連結リブ部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a two-way synthetic resin pallet on which articles are placed for transportation, storage, and the like.
[0002]
[Prior art]
Conventionally, a deck board 1 having a placement surface 1a on which a load is placed, a cylindrical side girder 2a formed along one opposite side of the deck board 1, and a opposed side girder A skid S ′ composed of a cylindrical intermediate girder portion 3a formed substantially parallel to the side girder portion 2a is formed in the middle portion of 2a by injection molding or the like, and two skids having such a configuration A two-way synthetic resin pallet as shown in FIG. 5 is manufactured by welding the ends of the side girders 2a of S ′ and the ends of the intermediate girders 3a. Are known. In the two-way synthetic resin pallet thus manufactured, the side spar 2 is formed by the side spar 2a where the ends are welded to each other, and the middle where the ends are welded to each other. An intermediate girder 3 is formed by the girder part 3 a, and two fork insertion holes 4 are formed between the side girder 2 and the intermediate girder 3.
[0003]
Further, in the side girder 2 and the intermediate girder 3, along the longitudinal direction of the side girder 2 and the intermediate girder 3 (longitudinal direction of the fork insertion hole 4), in the side girder 2 and in the intermediate girder 3 The section ribs 2b and ribs 3b having a substantially rectangular cross section perpendicular to the length direction are formed.
[0004]
[Problems to be solved by the invention]
Since the conventional two-way synthetic resin pallet described above is not sufficient in rigidity and strength along the longitudinal direction of the side girders 2 and the intermediate girders 3 (longitudinal direction of the fork insertion holes 4), the two-way synthesizing is performed. There was a problem that the service life of the resin pallet was short.
[0005]
Further, in the conventional two-way synthetic resin pallet, the thickness d2 of the end of the partition rib 2b and the rib 3b is thicker than the thickness d1 of the deck board 1 in the skid S 'state. There is a problem that the difference in shrinkage in the cooling process is large, and therefore the deck board 1 is deformed in a mountain shape.
[0006]
Furthermore, in order to reduce the weight of the synthetic resin pallet, it is normal practice to reduce the thickness of the rib. However, if the rib thickness is reduced, the strength of the synthetic resin pallet is reduced. There was also a problem that the rigidity was lowered.
[0007]
An object of the present invention is to solve the problems of the above-described conventional two-way synthetic resin pallet.
[0008]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention provides a deck board and an elongated cylindrical side girder formed along one opposite side of the deck board, and an intermediate part of the side girder. The end portions of the side girders and the end portions of the intermediate girders of the two skids having the elongated cylindrical intermediate girders formed substantially parallel to the side girders are welded respectively. In the two-way synthetic resin pallet manufactured by doing, the opposing short sides of the peripheral wall portion of the side girder portion are connected by a long side connecting rib portion having the same height as the peripheral wall portion. The long side connecting rib portion extends from the deck board over a predetermined length, with a thick portion extending in a substantially constant thickness, and is thinner than the thick portion, and the deck board It is formed from a thin-walled portion that extends in a substantially constant state with the same thickness as the thickness, The opposing short sides of the peripheral wall portion of the intermediate girder portion are connected by a long side connecting rib portion having the same height as the peripheral wall portion, and the long side connecting rib portion has a predetermined length from the deck board. In the meantime, a thick part extending in a substantially constant state, and a thickness that is thinner than the thick part and substantially the same as the thickness of the deck board extends in a substantially constant state. When the end portions of the side spar portions of the two skids and the end portions of the intermediate spar portion are welded together, the long side connecting rib portion of the side spar portion is formed. The end portions and the end portions of the long side connecting rib portions of the intermediate beam portion are configured to be welded, respectively .
[0009]
【Example】
1 to 3, an embodiment of the two-way synthetic resin pallet of the present invention will be described. However, the present invention is not limited to this embodiment unless it exceeds the gist of the present invention.
[0010]
S is a skid in an injection-molded state. Like the above-described conventional skid S ′, the skid S is an elongated board formed along the deck board 10 and one opposite side of the deck board 10. It has a cylindrical side girder part 11a, and an intermediate part of the opposite side girder part 11a, and a similarly slow-length cylindrical middle girder part 12a formed substantially parallel to the side girder part 11a. Yes.
[0011]
The side girder part 11a includes a peripheral wall part 13a, a long side connecting rib part 14a having the same height as the peripheral wall part 13a connecting the opposing short sides 13a1 of the peripheral wall part 13a, and a long side 13a2 of the peripheral wall part 13a facing each other. And a short-side connecting rib portion 15a having the same height as the peripheral wall portion 13a connecting the two, and arranged at a predetermined interval. In the present embodiment, one long side connecting rib portion 14a is shown, but a plurality of long side connecting rib portions 14a may be formed at a predetermined interval. In addition, 16a is a reinforcement rib part with a low height formed as needed along the short side connection rib part 15a on the back surface of the peripheral wall 13aa located between the short side connection rib parts 15a and the deck board 10. It is.
[0012]
The intermediate girder portion 12a has the same height as the peripheral wall portion 17a and the peripheral wall portion 17a connecting the opposing short sides 17a1 of the peripheral wall portion 17a, and a long-side connecting rib portion 18a disposed at a predetermined interval. The peripheral wall portion 17a has the same height as the peripheral wall portion 17a that connects the opposing long sides 17a2, and has a short-side connecting rib portion 19a disposed at a predetermined interval. In the present embodiment, two long side connecting rib portions 18a are shown, but three or more long side connecting rib portions 18a may be formed. In addition, 20a is a reinforcing rib with a low height formed as needed along the short side connecting rib portion 19a on the back surface of the peripheral wall portion 17a and the deck board 10 located between the short side connecting rib portions 19a. Part.
[0013]
On the back surface of the deck board 10 located between the side girder portion 11a and the intermediate girder portion 12a, a reinforcing rib 21 that runs vertically and horizontally and is lower than the peripheral wall portions 13a and 17a is formed. The fork insertion port 22 is formed by the recess 22a formed between the beam portion 11a and the intermediate beam portion 12a. In addition, on the peripheral wall of the deck board 10 of the present embodiment, a protruding portion 10a that slightly protrudes from the peripheral wall 13a of the side beam portion 11a and the peripheral wall 17a of the intermediate beam portion 12a is formed.
[0014]
By welding the ends of the side girders 11a and the ends of the intermediate girders 12a of the two skids S having the configuration as described above, 2 as shown in FIG. A pallet synthetic resin pallet is manufactured. In the two-way synthetic resin pallet manufactured in this way, the side spar 11 is formed by the side spar 11a whose ends are welded to each other, and the middle in which the ends are welded to each other. An intermediate beam 12 is formed by the beam portion 12a, and two fork insertion holes 22 are formed between the side beam 11 and the intermediate beam 12. In addition, the peripheral wall 13 of the side girder 11 which consists of the peripheral wall part 13a is formed by welding of the edge parts of the side girder part 11a of the two skids S, and similarly, the two skids S The peripheral wall 17 of the intermediate girder 12 including the peripheral wall portion 17a is formed by welding the ends of the intermediate girder portions 12a.
[0015]
The ends of the long side connecting ribs 14a formed in the side girders 11a of the two skids S are also welded together, and the side girders 11 are welded by welding the ends of the long side connecting ribs 14a. The long side connecting ribs 14 that define the inside are formed. Similarly, the ends of the short side connecting ribs 15a of the two skids S are also welded together, and the ends of the short side connecting ribs 15a are welded together. As a result, the short side connecting ribs 15 defining the inside of the side beams 11 are formed. Further, the ends of the long side connecting rib portions 18a formed in the intermediate girders 12a of the two skids S are also welded to each other, and the intermediate girders 12 are welded by welding the ends of the long side connecting rib portions 18a. The long side connecting ribs 18 that define the inside are formed. Similarly, the ends of the short side connecting ribs 19a of the two skids S are also welded together, and the ends of the short side connecting ribs 19a are welded together. As a result, the short side connecting ribs 19 that define the inside of the intermediate beam 12 are formed.
[0016]
In the present embodiment, in the skid S state, the long side connecting rib portion 14a formed in the side beam portion 11a has a predetermined length (height direction) from the deck board 10 and a substantially constant thickness d3. The thick part 14a1 extending in a state and the thin part extending from the center part of the thick part 14a1 and having a thickness d4 thinner than the thick part 14a1 and with a substantially constant thickness d4 Part 14a2. Similarly, in the skid S state, the long side connecting rib portion 18a formed in the intermediate beam portion 12a extends from the deck board 10 with a predetermined length (height direction) and a substantially constant thickness d5. And a thin portion 18a2 that extends from the central portion of the thick portion 18a1 and has a thickness d6 that is thinner than the thick portion 18a1 and that has a substantially constant thickness d6. Is formed. Accordingly, the long side connecting ribs 14 and the long side connecting ribs 18 that define the side beams 11 of the synthetic resin pallet manufactured by welding the two skids S are the deck board 10. The thick side portions 14a1 and 18a1 located on the side and the thin portion 14a2 and 18a2 located between the thick portions 14a1 and 18a1 located on the deck board 10 side. The cross-sectional shape perpendicular to the longitudinal direction of 18 is formed in a substantially drum shape. By forming in this way, the section modulus and the section moment of inertia are larger than the section ribs 2b and ribs 3b having a substantially rectangular cross section of the conventional two-way synthetic resin pallet, and therefore, When the weight of the synthetic resin pallet is the same and the cross-sectional areas of the conventional partition ribs 2b and 3b and the long side connecting ribs 14 and 18 of the present embodiment are the same, the conventional two-way synthetic resin pallet is used. Rigidity and strength along the longitudinal direction of the side girder 11 and the intermediate girder 12 of the two-way synthetic resin pallet become larger than the pallet, and the service life of the two-way synthetic resin pallet becomes longer. In other words, the weight of the two-way synthetic resin pallet can be reduced when the rigidity and strength equivalent to those of the conventional two-way synthetic resin pallet are sufficient.
[0017]
Further, as described above, the thickness d4 of the thin portion 14a2 located at the tip of the long side connecting rib portion 14a formed in the side beam portion 11a of the skid S is the root portion of the long side connecting rib portion 14a. Since the thickness d4 of the thin portion 14a2 can be configured to be substantially the same as the thickness of the deck board 10, the deck in the skid S 'state is formed. The deck board 10 resulting from cooling after injection molding of the skid, like a conventional two-way synthetic resin pallet in which the wall thickness d2 at the tip of the partition rib 2b and rib 3b is thicker than the wall thickness d1 of the board 1 Can be prevented.
[0018]
In the above-described embodiment, in addition to the configuration in which the cross-sectional shapes of the long side connecting ribs 14 that define the inside of the side beam 11 and the long side connecting ribs 18 that define the inside of the intermediate beam 12 are substantially drum-shaped, 2 Of the peripheral walls 13 of the side spar 11 formed by welding the ends of the side spar portions 11a of the skids S, the cross-sectional shape of the long side peripheral wall 13 'located on the fork insertion port 22 side Is formed in a substantially drum shape in the same manner as the cross-sectional shape of the long side connecting ribs 14 that define the inside of the side girders 11 and the long side connecting ribs 18 that define the inside of the intermediate girders 12, thereby further combining two-way The rigidity and strength of the resin pallet can be increased. Further, of the peripheral walls 17 of the intermediate beam 12 formed by welding the ends of the intermediate portions 12a of the two skids S, the cross-sectional shape of the long-side peripheral wall 17 'located on the fork insertion port 22 side Are formed in a substantially drum shape in the same manner as the cross-sectional shapes of the long-side connecting ribs 14 that define the inside of the side girders 11 and the long-side connecting ribs 18 that define the inside of the intermediate girders 12. The rigidity and strength of the pallet can be further increased. Further, of the peripheral walls 13 of the side girders 11 formed by welding the ends of the two side girders 11a of the two skids S, the long side circumferential wall located on the opposite side of the fork insertion port 22 Similar to the cross-sectional shape of the long-side connecting rib 14 that divides the side girder 11 and the long-side connecting rib 18 that divides the intermediate girder 12, the cross-sectional shape of 13 ″ is formed in a substantially drum shape. The rigidity and strength of the pallet synthetic resin pallet can be further increased.
[0019]
As described above, at least the long side connecting ribs 14 and 18 that define the inside of the girders 11 and 18 extend from the deck board 10 with a predetermined length (in the height direction) and the thicknesses d3 and d5 being substantially constant. The thick-walled portions 14a1, 18a1 and the thin-walled portions 14a2, 18a2 that are located between the thick-walled portions 14a1, 18a1 and have the thicknesses d4, d6 thinner than the thicknesses d3, d5 extend in a substantially constant state. Since the cross-sectional shape of the two-way synthetic resin pallet is increased in rigidity and strength, the service life of the two-way synthetic resin pallet is increased. .
[0020]
【The invention's effect】
Since the present invention has the above-described configuration, the following effects can be achieved.
[0021]
At least the long-side connecting ribs that define the inside of the girders are positioned between the thick-walled portions and the thick-walled portions that extend from the deck board with a predetermined length and a substantially constant thickness. Since the thinner part is formed from a thin part extending in a substantially constant state, the rigidity and strength of the two-way synthetic resin pallet can be increased. The service life of can be extended.
[0022]
In addition, since the thickness of the distal end portion of the long side connecting rib portion formed in the girder portion of the skid is formed thinner than the thickness of the root portion of the long side connecting rib portion, it results from cooling after injection molding of the skid. The mountain-like deformation of the deck board can be prevented.
[Brief description of the drawings]
FIG. 1 is a perspective view of a skid constituting a two-way synthetic resin pallet according to the present invention.
2 is a partially enlarged perspective view of the skid shown in FIG. 1. FIG.
FIG. 3 is a partial vertical sectional view perpendicular to the fork insertion hole of the two-way synthetic resin pallet of the present invention.
FIG. 4 is a partial vertical sectional view orthogonal to a fork insertion hole of a two-way synthetic resin pallet according to another embodiment of the present invention.
FIG. 5 is a perspective view of a conventional two-way synthetic resin pallet.
6 is a vertical sectional view taken along the line II of FIG.
[Explanation of symbols]
S ·················································································· ... Long side connecting ribs 14a, 18a ... Long side connecting ribs

Claims

Formed substantially parallel to the side girder at the middle of the side girder and the elongated cylindrical side girder formed along the opposite side of the deck board and the deck board A two-way synthetic resin pallet manufactured by welding the ends of the side spars and the ends of the intermediate spars of two skids having an elongated cylindrical intermediate spar. In the above, the opposing short sides of the peripheral wall portions of the side spar portions are connected by long side connecting rib portions having the same height as the peripheral wall portion, and the long side connecting rib portions are separated from the deck board. A thick part extending in a substantially constant state over a predetermined length, and a thickness that is thinner than the thick part and substantially the same as the thickness of the deck board is substantially constant. Are formed from extending thin portions, and similarly, the short sides of the peripheral wall portion of the intermediate beam portion are opposed to each other. The long side connecting ribs having the same height as the peripheral wall portion are connected to each other, and the long side connecting ribs extend from the deck board over a predetermined length with a substantially constant thickness. A thick wall portion, and a thin wall portion which is thinner than the thick wall portion and extends in a substantially constant thickness substantially the same as the thickness of the deck board. When the ends of the side spar and the ends of the intermediate spar are welded together, the ends of the long linking ribs of the side spar and the long linking ribs of the intermediate spar A two-way synthetic resin pallet characterized in that the ends of each are welded together .