JP4187136B2 - Plastic pallet - Google Patents

Plastic pallet Download PDF

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Publication number
JP4187136B2
JP4187136B2 JP2001215022A JP2001215022A JP4187136B2 JP 4187136 B2 JP4187136 B2 JP 4187136B2 JP 2001215022 A JP2001215022 A JP 2001215022A JP 2001215022 A JP2001215022 A JP 2001215022A JP 4187136 B2 JP4187136 B2 JP 4187136B2
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Japan
Prior art keywords
deck board
pallet
column
corner
synthetic resin
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JP2001215022A
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JP2003026167A (en
Inventor
国宏 寺野
徳昭 原
塩屋　　圭
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Meiji Rubber and Chemical Co Ltd
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Meiji Rubber and Chemical Co Ltd
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Priority to JP2001215022A priority Critical patent/JP4187136B2/en
Priority to KR1020020006387A priority patent/KR100738860B1/en
Publication of JP2003026167A publication Critical patent/JP2003026167A/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D19/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D19/0004—Rigid pallets without side walls
    • B65D19/0053—Rigid pallets without side walls the load supporting surface being made of more than one element
    • B65D19/0055—Rigid pallets without side walls the load supporting surface being made of more than one element forming a continuous plane contact surface
    • B65D19/0057—Rigid pallets without side walls the load supporting surface being made of more than one element forming a continuous plane contact surface the base surface being made of a single element
    • B65D19/0059—Rigid pallets without side walls the load supporting surface being made of more than one element forming a continuous plane contact surface the base surface being made of a single element forming a continuous plane contact surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D19/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D19/36—Pallets comprising a flexible load carrier extending between guide elements, e.g. guide tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D2519/00004—Details relating to pallets
    • B65D2519/00009—Materials
    • B65D2519/00014—Materials for the load supporting surface
    • B65D2519/00034—Plastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D2519/00004—Details relating to pallets
    • B65D2519/00009—Materials
    • B65D2519/00049—Materials for the base surface
    • B65D2519/00069—Plastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2519/00—Pallets or like platforms, with or without side walls, for supporting loads to be lifted or lowered
    • B65D2519/00004—Details relating to pallets
    • B65D2519/00736—Details
    • B65D2519/00776—Accessories for manipulating the pallet
    • B65D2519/00786—Accessories for manipulating the pallet for lifting, e.g. hooks, loops
    • B65D2519/00791—Accessories for manipulating the pallet for lifting, e.g. hooks, loops handles, handgrip holes

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pallets (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Description

【０００１】
【発明の属する技術分野】
この発明は、荷物を保管、運搬する際に使用するフォークリフト用の合成樹脂製パレットに係り、特に成型時の樹脂の流れを良好にした合成樹脂製パレットに関する。
【０００２】
【従来の技術】
従来使用されている合成樹脂製パレットは、１０００ｍｍ×１０００ｍｍ、１１００ｍｍ×１４００ｍｍのような大型成型品であるから、通常４点以上のゲートにより射出成形される。このようにゲート数を多くした多点ゲート方式にするのは、射出成形時の樹脂の流動性を確保し、短時間で充填固化が完了して生産性を上げるためであり、また発泡樹脂成型品においてはゲート部より樹脂の流れる距離が長くなると各部の発泡密度の差が大きくなるからである。即ち、パレットのような大型成型品においては、多点ゲート方式によって樹脂の充填速度を速くしてウェルド部の発生を防止している。
【０００３】
しかしながら、多点ゲート方式として樹脂の流動性がよくなるような対策をとったとしても、ウェルド部の発生を完全に防止できるものではない。そこで、パレットのほぼ中央部に１点のゲート部を設け、前記ゲート部から四隅の先端部に向けて連続した湯道リブを設けたパレットが提案されている（例えば、特開平１０−３１６１３４号公報）。ゲート部から四隅の先端部に向けて湯道リブを設けることによって、樹脂の流動性がよくなり充填速度を速くすることができるから、ウェルド部の発生を防止できる。
【０００４】
【発明が解決しようとする課題】
図６は、従来の四方差しパレットの一例を示す斜視図である。四方差しパレット１は、上部デッキボード３と下部デッキボード５の四隅に支柱部７を設け、前記四隅支柱部７の中間に中間支柱部９を設け、さらに、ほぼ中央部に中央支柱部８を設け、前記支柱部７，９と上下デッキボード３，５で囲まれた空間をフォーク挿入口１０としている。そして、ハンドリフト（手動による小型のフォークリフト）やパレットトラックの使用を可能にするために、下部デッキボード５には、各支柱部の間に比較的大きな開口１１が設けられている。
【０００５】
従って、射出成型時の溶融樹脂は、デッキボード中央部のゲート部から開口１１を回って四隅に流れることになる。このように、デッキボードに大きな開口１１を設けた場合には、ゲート部から四隅の先端部に向けて直線的な湯道リブを設けることができない。ハンドリフトやパレットトラックの使用を可能とする比較的大きな開口を設けたデッキボードの製造には、多点ゲート方式を用いなければならなかった。
【０００６】
そこで、この発明は、デッキボードに比較的大きな開口を有するパレットの場合にも、一点ゲート方式を用いて射出成形時の溶融樹脂の流動性を確保すると共に、生産性を向上させ、堅牢な合成樹脂製パレットを提供するものである。
【０００７】
【課題を解決するための手段】
この発明は上記目的を達成するために次のような構成とした。即ち、この発明に係る合成樹脂製パレットは、上部デッキボードと下部デッキボードの四隅に支柱部を設け、前記四隅支柱部の中間に中間支柱部を設け、さらにデッキボードの中央部に中央支柱部を設けてなる合成樹脂製パレットにおいて、前記各支柱部を中空構造に形成し、デッキボードのほぼ中央部に一点ゲート部を設け、中間支柱部のデッキボード中央部側の角部内面に肉盛り部を設けたことを特徴とする。肉盛り部の肉厚は、材質や支柱部の形状等によって決定すればよいが、一般には１〜５ｍｍの肉厚とすることができる。肉盛り部は、必ずしも中間支柱部の全高さに亘って設ける必要はないが、中間支柱部内に設けた補強リブの高さよりも高く形成することが好ましい。また、適宜、肉盛り部を角部から連続して直線部にまで延設してもよい。上記構成は、四隅支柱部、中間支柱部及び中央支柱部で囲まれた範囲に開孔を設けた下部デッキボードを備えた合成樹脂製パレットに有効である。
【０００８】
【発明の実施の形態】
以下に、図示する実施形態について詳細に説明する。合成樹脂製パレット２０は四方差しパレットであって、上部デッキボード２３と下部デッキボード２５の四隅に支柱部２７を設け、前記四隅支柱部２７の中間に中間支柱部２９を設け、さらに中央部に中央支柱部２８を設けてなり、前記支柱部２７，２９と上下デッキボード２３，２５で囲まれた空間をフォーク挿入口３０としている。そして、下部デッキボード２５には、ハンドリフトやパレットトラックの使用を可能にする比較的大きな開口３１が設けられている。
【０００９】
前記パレット２０は、予め支柱部の中間位置で上部成形部材３３と下部成形部材３５に分割成形されている。上部成形部材３３は、上部デッキボード２３と四隅の支柱部２７ａと中間支柱部２９ａと中央部支柱部２８ａとからなる。また、下部成形部材３５は、下部デッキボード２５と四隅の支柱部２７ｂと中間支柱部２９ｂと中央部支柱部２８ｂとからなり、分割面を付き合わせ溶着してなる。
【００１０】
前記支柱部２７，２８，２９は、中空構造体であり、上記合成樹脂製パレットに用いる樹脂には、ポリスチレン、ポリエチレン、ポリプロピレン、塩化ビニル、ＡＢＳ樹脂等を用いることができ、必要に応じて発泡剤、充填剤等を添加してもよい。
【００１１】
この発明の特徴は、１点ゲート方式とし、四隅支柱部２７ｂと中間支柱部２９ｂと中央支柱部２８ｂによって囲まれた部分に大きな開口を設けた場合にも、射出成形時の溶融樹脂の流動性を確保する構造としたものである。
【００１２】
そこで、中央支柱部２８ｂの略中心部にゲート部３７を設け、前記ゲート部３７を設けた天板２５の下面には円形リブ３９を設けるとともに、前記円形リブ３９には、縦横の補強リブ４０、４１を設け、さらに、中央支柱部２８の四隅に向かって湯道リブ４３を設けてなる。円形リブ３９の形成は、補強リブ４０、４１及び湯道リブ４３が直接交差すると交差部分が肉厚部となり、冷却時間がかかったり収縮が不均等になるのでこれらを防止するためである。前記円形リブ３９は、中央支柱部２８ｂの全高さに亘って設けることが好ましいが、補強リブ４０、４１及び湯道リブ４３の高さとほぼ同一にしてもよい。また、前記円形リブ３９は、適宜省略することも可能である。
【００１３】
前記円形リブ３９内の天板２５の肉厚、または中央支柱部２８ｂ内における天板の肉厚を天板の他の部分よりも厚肉に形成してもよい。この場合、天板の肉厚をゲート部３７の部分から中央支柱部２８ｂの側壁に向かって次第に薄肉となるように形成してもよい。例えば、円形リブ３９の内側における天板の肉厚をもっとも厚く６ｍｍとし、その外側に中間の厚さ５ｍｍとし、さらにその外側に４ｍｍの厚さの天板とし、順次階段状に設けることができる。このように、ゲート部３７における天板の肉厚を厚くした場合には、前記縦横の補強リブ４０、４１及び湯道リブ４３と相まって樹脂の流れが一層良くなる。
【００１４】
中間支柱部２９ｂの内部には、パレットの側面に対して直交する補強リブ４５と、パレットの側面に対して平行な補強リブ４７が設けられている。前記補強リブ４５と補強リブ４７は、支柱部の側壁から一定の範囲のみが支柱部と同じ高さに形成されており、支柱部と同じく分割面において溶着される。
【００１５】
中間支柱部２９のデッキボード中央部側の角部内面（一点ゲート部側の角部内面）には、一点ゲート方式においても溶融樹脂の流れを確保する肉盛り部５０を設けてなる。前記肉盛り部５０は、中間支柱部２９ｂの角部内面に沿って設けられており、その側端は中間支柱部２９ｂの内面へと滑らかに移行している。即ち、肉盛り部５０の側端は次第に薄肉になるように形成されている。
【００１６】
肉盛り部５０の天板からの高さは、補強リブ４５、４７と同じ程度でも良いが、補強リブ４５、４７よりも高く、例えば４０ｍｍ程度の高さに形成するのが好ましい。また、肉盛り部５０の厚さは、パレットの大きさや支柱部の構造によって決定すればよいが、１ｍｍより少ないと殆ど効果が得られず、５ｍｍより多いと重量が増加したり冷却時にヒケが発生し易くなるから、１〜５ｍｍとすることが望ましい。
【００１７】
デッキボードに比較的大きな開口を設けた場合には、溶融樹脂は中央支柱部２８ｂのゲート部３７から中間支柱部２９ｂの角部を経て四隅支柱部２７ｂ方向に流れることになるが、上記のように、中間支柱部２９ｂのデッキボード中央部側の角部内面に肉盛り部５０を設けることによって、溶融樹脂はスムーズに流れることになる。
【００１８】
肉盛り部は、角部に設けた肉盛り部５０に連続して側壁の直線部４９にも肉盛り部５１を一体に設けてもよい。肉盛り部の延設は、図３に示すように、開口３１が中間支柱部２９ｂの角部よりも内方に形成されている場合のように、溶融樹脂の流路が角部よりも内方に位置している場合に有効である。肉盛り部５１を肉盛り部５０に連続して設ける場合には、高さ及び肉厚の厚さはそれぞれ同様に形成する。肉盛り部５０と肉盛り部５１との間に、図示する実施形態のように、補強リブを介して設けてもよい。
【００１９】
このように、肉盛り部５１を延長して設けた場合には、開口３１が中間支柱部２９ｂの角部よりも内方にまで形成されている場合にも、溶融樹脂を四隅支柱部方向にスムーズに流すことができるとともに、冷却後のヒケを防止する。
【００２０】
肉盛り部５０，５１を設けることによってゲート部３７から四隅までの樹脂の流動性を確保するばかりでなく、デッキボードの付け根部分の補強となり、強度が向上した。尚、天板２５の内面には、図示するのを省略したが、公知の補強リブを設けることができる。補強リブは、パレットの端面に平行な格子状リブに限らず、パレットの端面に斜め方向に設けたリブであってもよく、またこれらを組合せたリブであってもよい。
【００２１】
また、上記実施形態では、デッキボードに比較的大きな開口を設けた下部成形部材３５について説明したが、開口を設けない上部成形部材３３にも適用できることはもちろんである。
【００２２】
【発明の効果】
この発明に係る合成樹脂製パレットは、下部デッキボードに大きな開口を有する場合にも、溶融樹脂の流れが変わる中間支柱部の角部内面に肉盛り部を形成したから、デッキボード中央に設けた一点ゲート部から四隅の先端部に向けて射出成形時の溶融樹脂の流動性が確保され、ウェルドの発生を防止した堅牢なパレットとすることができる。また、発泡成形においては、樹脂の流れが均一になることから、密度が均一な発泡状態のパレットが得られる。また、肉盛り部が天板と支柱部との連結部を補強することになるから、曲げ強度が増大しパレットの変形を防止することができる。
【図面の簡単な説明】
【図１】この発明に係るパレットの一例を示す正面図である。
【図２】図１のＡ−Ａ線断面図である。
【図３】中間支柱部の拡大断面図である。
【図４】同じく、中間支柱部の拡大断面図である。
【図５】図４のＢ−Ｂ線断面図である。
【図６】四方差しパレットの一例示す説明用斜視図である。
【符号の説明】
２０ 四方差しパレット
２３ 上部デッキボード
２５ 下部デッキボード
２７ 四隅支柱部
２８ 中央支柱部
２９ 中間支柱部
３０ フォーク挿入口
３１ 開口
３３ 上部成型部材
３５ 下部成型部材
３７ ゲート部
３９円形リブ
４０，４１ 補強リブ
４３ 湯道リブ
４５ 補強リブ
４７ 補強リブ
４９ 直線部
５０ 肉盛り部
５１ 肉盛り部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a synthetic resin pallet for forklifts used for storing and transporting luggage, and more particularly to a synthetic resin pallet having a good resin flow during molding.
[0002]
[Prior art]
Conventionally used synthetic resin pallets are large molded products such as 1000 mm × 1000 mm, 1100 mm × 1400 mm, and are usually injection molded by four or more gates. The reason why the multi-point gate system with a large number of gates is used is to ensure the fluidity of the resin during injection molding, to complete the filling and solidification in a short time, and to increase the productivity. This is because the difference in the foaming density of each part increases as the resin flow distance becomes longer than the gate part. That is, in a large molded product such as a pallet, the resin filling speed is increased by a multi-point gate method to prevent the occurrence of a weld portion.
[0003]
However, even if measures are taken to improve the fluidity of the resin as a multi-point gate system, the occurrence of welds cannot be completely prevented. In view of this, a pallet has been proposed in which a single gate portion is provided at substantially the center of the pallet, and runner ribs that are continuous from the gate portion toward the tip portions of the four corners are provided (for example, JP-A-10-316134). Publication). Providing runner ribs from the gate portion toward the tip of the four corners improves the fluidity of the resin and increases the filling speed, so that the occurrence of a weld portion can be prevented.
[0004]
[Problems to be solved by the invention]
FIG. 6 is a perspective view showing an example of a conventional four-way pallet. The four-way pallet 1 is provided with support columns 7 at the four corners of the upper deck board 3 and the lower deck board 5, an intermediate support column 9 at the middle of the four corner support plates 7, and a central support column 8 at substantially the center. The space surrounded by the support columns 7 and 9 and the upper and lower deck boards 3 and 5 is a fork insertion slot 10. In order to enable the use of a hand lift (a small forklift manually) or a pallet truck, the lower deck board 5 has a relatively large opening 11 between the columns.
[0005]
Therefore, the molten resin at the time of injection molding flows from the gate portion at the center of the deck board around the opening 11 to the four corners. Thus, when the large opening 11 is provided in the deck board, it is not possible to provide a straight runner rib from the gate portion toward the tip of the four corners. A multi-point gate system had to be used in the manufacture of deck boards with relatively large openings that allowed the use of hand lifts and pallet trucks.
[0006]
Therefore, the present invention uses a one-point gate system to ensure the fluidity of the molten resin during injection molding, improve productivity, and achieve a robust synthesis even in the case of a pallet having a relatively large opening in the deck board. A resin pallet is provided.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention is configured as follows. That is, the synthetic resin pallet according to the present invention is provided with support columns at the four corners of the upper deck board and the lower deck board, an intermediate support column in the middle of the four corner support plates, and a central support column at the center of the deck board. In the synthetic resin pallet having a structure, each of the support columns is formed in a hollow structure, a single-point gate is provided in the substantially central portion of the deck board, and the inner wall of the intermediate support column is built up on the inner surface of the corner portion of the deck board. A feature is provided. The thickness of the build-up portion may be determined depending on the material, the shape of the support column, and the like, but can generally be 1 to 5 mm. The build-up portion does not necessarily have to be provided over the entire height of the intermediate strut portion, but is preferably formed higher than the height of the reinforcing rib provided in the intermediate strut portion. Moreover, you may extend a build-up part to a linear part continuously from a corner | angular part suitably. The above configuration is effective for a synthetic resin pallet including a lower deck board provided with an opening in a range surrounded by a four-corner column part, an intermediate column part, and a center column part.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the illustrated embodiment will be described in detail. The synthetic resin pallet 20 is a four-way pallet, and is provided with support columns 27 at the four corners of the upper deck board 23 and the lower deck board 25, an intermediate support column 29 between the four corner support members 27, and further at the center. A center strut 28 is provided, and a space surrounded by the struts 27 and 29 and the upper and lower deck boards 23 and 25 is used as a fork insertion port 30. The lower deck board 25 is provided with a relatively large opening 31 that enables use of a hand lift or a pallet truck.
[0009]
The pallet 20 is preliminarily molded into an upper molding member 33 and a lower molding member 35 at an intermediate position of the support column. The upper molding member 33 includes an upper deck board 23, four corner column portions 27a, an intermediate column portion 29a, and a central column portion 28a. The lower molding member 35 is composed of a lower deck board 25, four column support portions 27b, an intermediate support column portion 29b, and a central support column portion 28b.
[0010]
The support columns 27, 28, and 29 are hollow structures, and polystyrene, polyethylene, polypropylene, vinyl chloride, ABS resin, or the like can be used as the resin used in the synthetic resin pallet, and foamed as necessary. Agents, fillers and the like may be added.
[0011]
The feature of the present invention is that the flowability of the molten resin at the time of injection molding even when a one-point gate system is used and a large opening is provided in a portion surrounded by the four corner struts 27b, the intermediate struts 29b, and the central struts 28b. It is a structure that secures.
[0012]
Therefore, a gate portion 37 is provided at a substantially central portion of the center support portion 28b, and a circular rib 39 is provided on the lower surface of the top plate 25 provided with the gate portion 37. The circular rib 39 has vertical and horizontal reinforcing ribs 40. 41, and further, runner ribs 43 are provided toward the four corners of the central post 28. The formation of the circular rib 39 is to prevent the reinforcing ribs 40 and 41 and the runner rib 43 from intersecting directly, resulting in a thickened portion, which takes a long time for cooling and uneven shrinkage. The circular rib 39 is preferably provided over the entire height of the central column 28b, but may be substantially the same as the height of the reinforcing ribs 40 and 41 and the runner rib 43. The circular rib 39 can be omitted as appropriate.
[0013]
The thickness of the top plate 25 in the circular rib 39 or the thickness of the top plate in the central support column 28b may be formed thicker than other portions of the top plate. In this case, the thickness of the top plate may be formed so as to gradually become thinner from the gate portion 37 toward the side wall of the central support column 28b. For example, the thickness of the top plate on the inner side of the circular rib 39 is set to 6 mm, the outer thickness is set to an intermediate thickness of 5 mm, and the top plate is further formed to a thickness of 4 mm on the outer side. . Thus, when the thickness of the top plate in the gate portion 37 is increased, the flow of the resin is further improved in combination with the vertical and horizontal reinforcing ribs 40 and 41 and the runner ribs 43.
[0014]
A reinforcing rib 45 that is orthogonal to the side surface of the pallet and a reinforcing rib 47 that is parallel to the side surface of the pallet are provided inside the intermediate strut portion 29b. The reinforcing rib 45 and the reinforcing rib 47 are formed at the same height as the supporting column only in a certain range from the side wall of the supporting column, and are welded on the dividing surface in the same manner as the supporting column.
[0015]
The intermediate strut portion 29 is provided with a built-in portion 50 on the inner surface of the corner portion on the center side of the deck board (the inner surface of the corner portion on the one-point gate portion side) that ensures the flow of the molten resin even in the one-point gate method. The build-up portion 50 is provided along the inner surface of the corner portion of the intermediate strut portion 29b, and its side end smoothly transitions to the inner surface of the intermediate strut portion 29b. That is, the side end of the built-up portion 50 is formed so as to become gradually thinner.
[0016]
The height of the built-up portion 50 from the top plate may be the same as that of the reinforcing ribs 45 and 47, but it is preferably higher than the reinforcing ribs 45 and 47, for example, about 40 mm. The thickness of the built-up portion 50 may be determined depending on the size of the pallet and the structure of the support column. However, if the thickness is less than 1 mm, almost no effect is obtained, and if it exceeds 5 mm, the weight increases or sink marks occur during cooling. Since it becomes easy to generate | occur | produce, it is desirable to set it as 1-5 mm.
[0017]
When a relatively large opening is provided in the deck board, the molten resin flows from the gate portion 37 of the central column portion 28b through the corner portion of the intermediate column portion 29b toward the four corner column portions 27b. Further, by providing the built-up portion 50 on the inner surface of the corner portion of the intermediate strut portion 29b on the center side of the deck board, the molten resin flows smoothly.
[0018]
The build-up part may be provided integrally with the build-up part 51 on the straight line part 49 of the side wall continuously from the build-up part 50 provided at the corner part. As shown in FIG. 3, the extension of the built-up portion is such that the flow path of the molten resin is inward of the corner portion as in the case where the opening 31 is formed inward of the corner portion of the intermediate strut portion 29b. It is effective when it is located in the direction. In the case where the build-up portion 51 is provided continuously to the build-up portion 50, the height and the thickness are formed in the same manner. You may provide between the build-up part 50 and the build-up part 51 via a reinforcement rib like embodiment shown in figure.
[0019]
In this way, when the built-up portion 51 is extended, the molten resin is directed in the direction of the four corner struts even when the opening 31 is formed inward from the corner portion of the intermediate strut portion 29b. It can flow smoothly and prevents sink marks after cooling.
[0020]
By providing the built-up portions 50 and 51, not only the fluidity of the resin from the gate portion 37 to the four corners is ensured, but also the base portion of the deck board is reinforced, and the strength is improved. In addition, although illustration was abbreviate | omitted in the inner surface of the top plate 25, a well-known reinforcement rib can be provided. The reinforcing ribs are not limited to the grid-like ribs parallel to the end face of the pallet, but may be ribs provided in an oblique direction on the end face of the pallet, or may be a combination of these.
[0021]
In the above-described embodiment, the lower molding member 35 provided with a relatively large opening in the deck board has been described. However, the present invention can also be applied to the upper molding member 33 without an opening.
[0022]
【The invention's effect】
The synthetic resin pallet according to the present invention is formed at the center of the deck board because the built-up portion is formed on the inner surface of the corner portion of the intermediate strut portion where the flow of the molten resin changes even when the lower deck board has a large opening. The fluidity of the molten resin at the time of injection molding is ensured from the one-point gate portion to the tip portions at the four corners, and a robust pallet that prevents the occurrence of welds can be obtained. In the foam molding, since the resin flow is uniform, a foamed pallet having a uniform density can be obtained. Moreover, since the build-up portion reinforces the connecting portion between the top plate and the column portion, the bending strength increases and deformation of the pallet can be prevented.
[Brief description of the drawings]
FIG. 1 is a front view showing an example of a pallet according to the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is an enlarged cross-sectional view of an intermediate strut portion.
FIG. 4 is an enlarged cross-sectional view of an intermediate strut portion.
5 is a cross-sectional view taken along line BB in FIG.
FIG. 6 is an explanatory perspective view showing an example of a four-way pallet.
[Explanation of symbols]
20 Four-way pallet 23 Upper deck board 25 Lower deck board 27 Four corner struts 28 Center struts 29 Middle struts 30 Fork insertion port 31 Opening 33 Upper molding member 35 Lower molding member 37 Gate 39 Circular ribs 40, 41 Reinforcement ribs 43 Runway rib 45 Reinforcement rib 47 Reinforcement rib 49 Straight line part 50 Overlay part 51 Overlay part

Claims (5)

上部デッキボードと下部デッキボードの四隅に支柱部を設け、前記四隅支柱部の中間に中間支柱部を設け、さらにデッキボードの中央部に中央支柱部を設けてなる合成樹脂製パレットにおいて、前記各支柱部を中空構造に形成し、デッキボードのほぼ中央部に一点ゲート部を設け、中間支柱部のデッキボード中央部側の角部内面に肉盛り部を設けてなり、前記肉盛り部の側端は次第に薄肉となって支柱部内面に移行していることを特徴とする合成樹脂製パレット。In the synthetic resin pallet in which the support column is provided at the four corners of the upper deck board and the lower deck board, the intermediate support column is provided in the middle of the four corner support units, and the central support column is provided at the center of the deck board. The strut part is formed in a hollow structure, a single-point gate part is provided in the substantially central part of the deck board, and a built-up part is provided on the inner surface of the corner part of the middle strut part on the deck board central part side. A synthetic resin pallet characterized in that the end gradually becomes thinner and moves to the inner surface of the column . 肉盛り部を１〜５ｍｍの肉厚としたことを特徴とする請求項１記載の合成樹脂製パレット。The pallet made of synthetic resin according to claim 1, wherein the build-up portion has a thickness of 1 to 5 mm. 肉盛り部を中間支柱部内に設けた補強リブの高さよりも高く形成したことを特徴とする請求項１または２記載の合成樹脂製パレット。The synthetic resin pallet according to claim 1 or 2, wherein the build-up portion is formed to be higher than the height of the reinforcing rib provided in the intermediate strut portion. 肉盛り部を角部から連続して直線部にまで延設したことを特徴とする請求項１〜３のいずれか１項に記載の合成樹脂製パレット。The pallet made of synthetic resin according to any one of claims 1 to 3, wherein the build-up portion is continuously extended from the corner portion to the straight portion. 下部デッキボードには、四隅支柱部、中間支柱部及び中央支柱部で囲まれた範囲に開口を設けたことを特徴とする請求項１〜４のいずれか１項に記載の合成樹脂製パレット。The synthetic resin pallet according to any one of claims 1 to 4, wherein the lower deck board is provided with an opening in a range surrounded by a four-corner column portion, an intermediate column portion, and a center column portion.
JP2001215022A 2001-07-16 2001-07-16 Plastic pallet Expired - Lifetime JP4187136B2 (en)

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JP2001215022A JP4187136B2 (en) 2001-07-16 2001-07-16 Plastic pallet
KR1020020006387A KR100738860B1 (en) 2001-07-16 2002-02-05 Pallet made of synthetic resin

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KR950001140U (en) * 1993-06-09 1995-01-03 Lightweight 1 shot double-sided pad
JP3774063B2 (en) * 1998-04-28 2006-05-10 株式会社明治ゴム化成 Method of manufacturing a plastic pallet using a hot runner mold having a plurality of valve gates
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