JP7791233B2 - Transport container - Google Patents
Transport containerInfo
- Publication number
- JP7791233B2 JP7791233B2 JP2024046807A JP2024046807A JP7791233B2 JP 7791233 B2 JP7791233 B2 JP 7791233B2 JP 2024046807 A JP2024046807 A JP 2024046807A JP 2024046807 A JP2024046807 A JP 2024046807A JP 7791233 B2 JP7791233 B2 JP 7791233B2
- Authority
- JP
- Japan
- Prior art keywords
- transport container
- bottom plate
- plate portion
- thick
- rectangle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Stackable Containers (AREA)
Description
本開示は、物品の搬送に用いられる搬送容器に関する。 This disclosure relates to a transport container used to transport items.
従来、この種の搬送容器として、十字状の凹部を形成するように底板部の下面に間隔をおいて配設された４つの格子状リブ部（凸部）を有する樹脂製の有底箱型容器が知られている（例えば、特許文献１参照）。かかる搬送容器を複数段積みする際、４つの格子状リブ部（凸部）は、下側の搬送容器の開口部または下側の搬送容器の蓋体に形成された凹部内に遊嵌される。これにより、複数の搬送容器を安定に段積みすると共に、上側の搬送容器を容易に取り出すことが可能になる。 A conventionally known transport container of this type is a bottomed, box-shaped container made of resin with four lattice-shaped ribs (protrusions) spaced apart on the underside of the bottom plate to form a cross-shaped recess (see, for example, Patent Document 1). When multiple such transport containers are stacked, the four lattice-shaped ribs (protrusions) fit loosely into the opening of the lower transport container or into a recess formed in the lid of the lower transport container. This allows multiple transport containers to be stacked stably and allows the upper transport container to be easily removed.
ところで、搬送容器内に収容される物品に防錆油等の油が付着している場合、搬送容器の底板部の上面にも油が付着する。また、複数の搬送容器が段積みされており、下側の搬送容器内の物品に油が付着している場合、上側の搬送容器の底板部（下面）は、下側の搬送容器内で気化した油に接触する。このため、搬送容器内の物品に油が付着している場合、底板部に油が浸透し、底板部の中央部が沈下するように当該底板部が変形してしまう（反ってしまう）ことがある。そして、中央部が沈下するように底板部が変形すると、上側の搬送容器の格子状リブ部の少なくとも一部と下側の搬送容器の側壁部（内面）とのクリアランスを確保し得なくなる。この結果、搬送容器が油の影響により変形した場合、複数の搬送容器を安定に段積みし得なくなり、上側の搬送容器が下側の搬送容器から外れなくなってしまうこともある。一方、搬送容器を例えばナイロン系樹脂等の高い耐油性をもった樹脂により搬送容器を形成すれば、上述のような底板部の変形の発生を抑制することができるであろう。しかしながら、高い耐油性をもった樹脂は、高価であり、搬送容器のコストアップを招いてしまう。 If oil, such as rust-preventive oil, adheres to the items contained in a transport container, the oil also adheres to the upper surface of the bottom plate of the transport container. Furthermore, if multiple transport containers are stacked and oil is adhering to the items in the lower transport container, the bottom plate (lower surface) of the upper transport container will come into contact with the oil vaporized in the lower transport container. Therefore, if oil is adhering to the items in the transport container, the oil may penetrate the bottom plate, causing the bottom plate to deform (warp) so that the center of the bottom plate sinks. If the bottom plate deforms so that the center sinks, it becomes impossible to ensure clearance between at least a portion of the lattice-shaped rib portion of the upper transport container and the sidewall (inner surface) of the lower transport container. As a result, if the transport containers are deformed due to the influence of oil, multiple transport containers cannot be stacked stably, and the upper transport container may become unable to be removed from the lower transport container. On the other hand, if the transport containers are made of a highly oil-resistant resin, such as a nylon-based resin, the occurrence of the above-mentioned bottom plate deformation may be suppressed. However, resins with high oil resistance are expensive, which increases the cost of the transport container.
そこで、本開示は、コストアップを抑制しつつ、段積み性や取り出し性を良好に確保することができる搬送容器の提供を主目的とする。 The primary objective of this disclosure is to provide a transport container that can be easily stacked and removed while minimizing cost increases.
本開示の搬送容器は、樹脂により形成され、底板部と、前記底板部の周縁部から上方に延出された側壁部とを含む搬送容器において、互いに交差する２つの凹部を画成するように前記底板部の下面から間隔をおいて下方に突出する４つの凸部と、前記４つの凸部を介して互いに対向するように前記底板部の下面の外周部に形成され、それぞれ他の前記搬送容器の前記側壁部の上端面に当接可能な少なくとも一対の当接面とを含み、前記底板部が、前記２つの凹部の交差部側で前記４つの凸部の外周面に接する四角形に上下方向からみて重なり合うと共に前記底板部の前記側壁部に沿って延在する領域よりも肉厚に形成された厚肉部を含むものである。 The transport container disclosed herein is formed from resin and includes a bottom plate and a side wall extending upward from the peripheral edge of the bottom plate; four protrusions protruding downward at a distance from the underside of the bottom plate to define two intersecting recesses; and at least one pair of abutment surfaces formed on the outer periphery of the underside of the bottom plate so as to face each other across the four protrusions, each of which can abut against the upper end surface of the side wall of another transport container; and the bottom plate includes a thick-walled portion that overlaps, when viewed from above, a quadrangle that abuts the outer periphery of the four protrusions on the intersection side of the two recesses and is thicker than the region extending along the side wall of the bottom plate.
本開示の搬送容器の底板部は、４つの凸部と、少なくとも一対の当接面とを含む。４つの凸部は、互いに交差する２つの凹部を画成するように底板部の下面から間隔をおいて下方に突出する。一対の当接面は、４つの凸部を介して互いに対向するように底板部の下面の外周部に形成され、それぞれ他の搬送容器の側壁部の上端面に当接可能である。更に、搬送容器の底板部は、２つの凹部の交差部側で４つの凸部の外周面に接する四角形に上下方向からみて重なり合う厚肉部を含む。当該厚肉部は、底板部の側壁部に沿って延在する領域よりも肉厚に形成される。これにより、本開示の搬送容器では、底板部に油が浸透した際に、２つの凹部の交差部が上方に隆起するように当該底板部を変形させて、搬送容器の各凸部が外方に張り出すのを抑制することができる。従って、複数の搬送容器が段積みされた際に、上側の搬送容器の底板部が油の影響により変形していたとしても、当該上側の搬送容器の各凸部（外周面）と、当接面に当接した下側の搬送容器の側壁部（内面）とのクリアランスを十分に確保することが可能になる。更に、本開示の搬送容器では、高い耐油性をもった高価な樹脂を採用することなく、物品に付着した油の悪影響を低減することができる。この結果、本開示の搬送容器では、コストアップを抑制しつつ、段積み性や取り出し性を良好に確保することが可能になる。 The bottom plate portion of the transport container of the present disclosure includes four protrusions and at least one pair of abutment surfaces. The four protrusions protrude downward at a distance from the underside of the bottom plate portion to define two intersecting recesses. The pair of abutment surfaces is formed on the outer periphery of the underside of the bottom plate portion so as to face each other via the four protrusions, and each is capable of abutting against the upper end surface of the side wall portion of another transport container. Furthermore, the bottom plate portion of the transport container includes a thick-walled portion that overlaps in a vertical direction in a quadrangle that contacts the outer periphery of the four protrusions on the side of the intersection of the two recesses. The thick-walled portion is formed thicker than the region extending along the side wall portion of the bottom plate portion. As a result, in the transport container of the present disclosure, when oil penetrates the bottom plate portion, the intersection of the two recesses deforms the bottom plate portion so that the intersection of the two recesses rises upward, preventing each protrusion of the transport container from protruding outward. Therefore, when multiple transport containers are stacked, even if the bottom plate of the upper transport container is deformed due to the effects of oil, it is possible to ensure sufficient clearance between each convex portion (outer peripheral surface) of the upper transport container and the side wall portion (inner surface) of the lower transport container that abuts against the abutting surface. Furthermore, the transport container of the present disclosure can reduce the adverse effects of oil adhering to items without using expensive resins with high oil resistance. As a result, the transport container of the present disclosure can ensure good stackability and ease of removal while suppressing cost increases.
次に、図面を参照しながら、本開示の発明を実施するための形態について説明する。 Next, we will explain the form for implementing the invention of this disclosure with reference to the drawings.
図１および図２は、本開示の搬送容器１を示す斜視図である。これらの図面に示す搬送容器１は、内部に物品を収容した状態で搬送・保管されるものである。搬送容器１は、ポリプロピレン系樹脂の射出成形により有底角筒状すなわち上部が開放された立方体状（直方体状）に一体成形されている。図示するように、搬送容器１は、角丸正方形状（角丸長方形状）の平面形状を有する底板部２と、底板部２の周縁部から上方に延出された角筒状の側壁部３とを含む。側壁部３は、４つの側面４を有し、隣り合う側面４の間には、曲面状のコーナー面が形成されている。更に、側壁部３は、各側面４および各コーナー面の上縁部（開口端側の周縁部）から外側に突出して当該側壁部３の上端面を形成するフランジ部３ｆを含む。 1 and 2 are perspective views of a transport container 1 according to the present disclosure. The transport container 1 shown in these drawings is transported and stored with items housed inside. The transport container 1 is integrally molded by injection molding of polypropylene resin into a bottomed, square-tube shape, i.e., a cube (rectangular parallelepiped) with an open top. As shown, the transport container 1 includes a bottom plate 2 having a rounded square (rounded rectangular) planar shape and a square-tube side wall 3 extending upward from the periphery of the bottom plate 2. The side wall 3 has four side surfaces 4, with curved corners formed between adjacent side surfaces 4. Furthermore, the side wall 3 includes flanges 3f that protrude outward from the upper edges (peripheries on the opening end side) of each side surface 4 and each corner surface, forming the upper end surface of the side wall 3.
また、図２に示すように、搬送容器１は、それぞれ底板部２に形成された４つのリブ部（凸部）５および一対の当接面６を含む。本実施形態において、各リブ部５は、角丸正方形状（角丸長方形状）の断面形状を有する筒状部および当該筒状部内に形成された格子状のリブを含む格子状リブ部である。４つのリブ部５は、それぞれ底板部２の下面の対応するコーナー部に近接するように当該底板部２の下面から間隔をおいて下方に突出する。これにより、４つのリブ部５は、底板部２の中央部で互いに十字状に交差（直交）する２つの凹部７を画成する。一対の当接面６は、４つのリブ部５を介して互いに対向するように底板部２の下面の外周部に形成される。一対の当接面６は、それぞれ他の搬送容器１の側壁部３の上端面すなわちフランジ部３ｆの上面に当接可能である。なお、４つのリブ部５に対して、２対の当接面６が設けられてもよく、底板部２の下面の外周部の全周にわたって当接面６が形成されてもよい。 As shown in FIG. 2 , each transport container 1 includes four rib portions (protrusions) 5 and a pair of abutment surfaces 6 formed on the bottom plate portion 2. In this embodiment, each rib portion 5 is a lattice-like rib portion including a cylindrical portion having a cross-sectional shape of a rounded square (rounded rectangle) and lattice-like ribs formed within the cylindrical portion. The four rib portions 5 protrude downward from the underside of the bottom plate portion 2 at intervals so as to be adjacent to corresponding corners of the underside of the bottom plate portion 2. As a result, the four rib portions 5 define two recesses 7 that cross (orthogonally intersect) each other in a crisscross pattern at the center of the bottom plate portion 2. The pair of abutment surfaces 6 are formed on the outer periphery of the underside of the bottom plate portion 2 so as to face each other via the four rib portions 5. Each of the pair of abutment surfaces 6 can abut against the upper end surface of the side wall portion 3 of another transport container 1, i.e., the upper surface of the flange portion 3f. Alternatively, two pairs of contact surfaces 6 may be provided for each of the four rib portions 5, or the contact surfaces 6 may be formed around the entire outer periphery of the lower surface of the bottom plate portion 2.
かかる搬送容器１が複数段に段積みされる際、搬送容器１の４つのリブ部５は、下側の搬送容器１（側壁部３）の開口内または下側の搬送容器１に装着された蓋体の凹部内に遊嵌される。すなわち、４つのリブ部５の諸元は、下側の搬送容器１の側壁部３のフランジ部３ｆが上側の搬送容器１の対応する当接面６に当接した状態で、図３に示すように、各リブ部５の外周面と側壁部３の内面との間にクリアランスＣが形成されるように定められている。これにより、複数の搬送容器１を安定に段積みすると共に、上側の搬送容器１を容易に取り出すことが可能になる。 When such transport containers 1 are stacked in multiple tiers, the four rib portions 5 of the transport container 1 fit loosely into the opening of the lower transport container 1 (side wall portion 3) or into the recess of the lid attached to the lower transport container 1. That is, the specifications of the four rib portions 5 are determined so that, when the flange portion 3f of the side wall portion 3 of the lower transport container 1 abuts against the corresponding abutment surface 6 of the upper transport container 1, a clearance C is formed between the outer surface of each rib portion 5 and the inner surface of the side wall portion 3, as shown in FIG. 3. This allows multiple transport containers 1 to be stacked stably and the upper transport container 1 to be easily removed.
また、搬送容器１の隣り合う２つのリブ部５は、当該搬送容器１の幅の概ね半分の幅を有する他の搬送容器（側壁部）の開口内にも遊嵌され得る。従って、搬送容器１は、２つの当該他の搬送容器の上にも搭載可能である。また、当該他の搬送容器の底板部に長手方向に並ぶ２つのリブ部（凸部）が形成されている場合、搬送容器１の上に２つの当該他の搬送容器を搭載することができる。このため、搬送容器１において、各凹部７の幅は、他の搬送容器の側壁部に形成されたフランジ部の幅の２倍よりも長く定められる。 Furthermore, the two adjacent rib portions 5 of the transport container 1 can also be loosely fitted into the opening of another transport container (side wall portion) having a width approximately half the width of the transport container 1. Therefore, the transport container 1 can also be mounted on top of two other transport containers. Furthermore, if two rib portions (convex portions) aligned longitudinally are formed on the bottom plate portion of the other transport container, the two other transport containers can be mounted on top of the transport container 1. For this reason, the width of each recess 7 in the transport container 1 is set to be longer than twice the width of the flange portion formed on the side wall portion of the other transport container.
ここで、搬送容器１の底板部２に搭載される物品の中には、防錆油や潤滑油等が塗布または充填されている部品が含まれ、搬送容器１内に収容される物品に防錆油等の油が付着している場合、搬送容器１の底板部２の上面に多量の油が付着することがある。また、複数の搬送容器１が段積みされており、下側の搬送容器１内に収容される物品に油が付着している場合、上側の搬送容器１の底板部２は、下側の搬送容器１内で気化した油に接触する。 The items loaded onto the bottom plate 2 of the transport container 1 include parts coated with or filled with anti-rust oil, lubricating oil, etc., and if the items contained within the transport container 1 are coated with anti-rust oil or other oil, a large amount of oil may adhere to the upper surface of the bottom plate 2 of the transport container 1. Furthermore, if multiple transport containers 1 are stacked and oil is attached to an item contained within a lower transport container 1, the bottom plate 2 of the upper transport container 1 will come into contact with the oil that has vaporized within the lower transport container 1.
このため、複数の格子状リブ部５′を含む従来の搬送容器１′内の物品に油が付着している場合、底板部２′に油が浸透し、図４に示すように、底板部２′の中央部（２つの凹部７′の交差部、図５参照）が沈下するように当該搬送容器１′の底板部２′が変形してしまう（反ってしまう）ことがある。そして、中央部が沈下するように底板部２′が変形すると、図４からわかるように、各格子状リブ部５′が外方に張り出し、複数の格子状リブ部５′の少なくとも一部の外周面と、下側の搬送容器１′の側壁部３′（内面）とのクリアランスを確保し得なくなる。この結果、搬送容器１′すなわち底板部２′が油の影響により変形した場合、複数の搬送容器１′を安定に段積みし得なくなり、上側の搬送容器１′が下側の搬送容器１′から外れなくなってしまうこともある。 For this reason, if oil is present on items inside a conventional transport container 1' containing multiple lattice-shaped ribs 5', the oil may penetrate the bottom plate 2', causing the bottom plate 2' of the transport container 1' to deform (warp) so that the center of the bottom plate 2' (the intersection of two recesses 7', see Figure 5) sinks, as shown in Figure 4. When the bottom plate 2' deforms so that the center sinks, as can be seen in Figure 4, each lattice-shaped rib 5' protrudes outward, making it impossible to ensure clearance between at least a portion of the outer periphery of the multiple lattice-shaped ribs 5' and the side wall 3' (inner surface) of the lower transport container 1'. As a result, if the transport container 1', i.e., the bottom plate 2', deforms due to the influence of oil, multiple transport containers 1' cannot be stacked stably, and the upper transport container 1' may not be able to be removed from the lower transport container 1'.
かかる現象を踏まえて、本発明者らは、油が付着した物品が収容される搬送容器１の取り扱い性をより向上させるべく鋭意研究を行った。本発明者らは、まず、平坦な上面を有する底板部２′および複数の格子状リブ部５′を含む従来の搬送容器１′について、底板部２′に上側および下側から荷重を加える実験を行い、その結果、底板部２′の上面の中央部（２つの凹部７′の交差部）に下向き荷重を加えたときの弾性率が底板部２′の下面の中央部に上向きの荷重を加えたときの弾性率よりも低くなることを見出した。すなわち、従来の搬送容器１′は、平坦な上面を有する底板部２′が中央部が沈下するように変形しやすい特性を有していることが判明した。また、従来の搬送容器１′における油の浸透による底板部２′の変形について考察すれば、搬送容器１′では、底板部２′の全体に油が浸透し、底板部２′の全体が均一に膨潤すると想定される。このため、従来の搬送容器１′の底板部２′は、自重により中央部が沈下するように変形すると考えられる。 In light of this phenomenon, the inventors conducted extensive research to further improve the handleability of transport containers 1 for storing oily items. The inventors first conducted an experiment on a conventional transport container 1', which included a bottom plate 2' with a flat upper surface and multiple lattice-shaped ribs 5', in which loads were applied from above and below the bottom plate 2'. They found that the modulus of elasticity when a downward load was applied to the center of the upper surface of the bottom plate 2' (the intersection of two recesses 7') was lower than the modulus of elasticity when an upward load was applied to the center of the lower surface of the bottom plate 2'. In other words, it was found that the conventional transport container 1' has a tendency for its flat upper surface to deform so that its center sinks. Furthermore, considering the deformation of the bottom plate 2' due to oil penetration in a conventional transport container 1', it is assumed that oil penetrates the entire bottom plate 2', causing the entire bottom plate 2' to swell uniformly. For this reason, it is thought that the bottom plate portion 2' of the conventional transport container 1' deforms under its own weight, causing the center portion to sink.
更に、本発明者らは、複数の評価条件下で搬送容器１′を恒温槽（例えば、８０℃の環境下）内に所定時間（例えば、６日間）だけ置いて、底板部２′の変形に対する油や物品の重量等の影響の度合いを評価した。評価に用いた搬送容器１′は、
（１）底板部２′の上面に油（防錆油）を浸した搬送容器１′、
（２）底板部２′の上面に錘（例えば１５ｋｇ程度）を載せた搬送容器１′、
（３）底板部２′の上面に油（防錆油）を浸し、かつ錘（例えば１５ｋｇ程度）を載せた搬送容器１′および
（４）底板部２′の上面に油（防錆油）を浸した搬送容器１′の上に段積みされた搬送容器１′
であった。
Furthermore, the inventors evaluated the degree of influence of oil, the weight of the article, etc. on the deformation of the bottom plate portion 2' by placing the transport container 1' in a thermostatic bath (for example, in an environment of 80°C) for a predetermined time (for example, 6 days) under a plurality of evaluation conditions.
(1) A transport container 1' in which the upper surface of the bottom plate portion 2' is soaked in oil (rust-preventive oil),
(2) A transport container 1' with a weight (for example, about 15 kg) placed on the top surface of the bottom plate portion 2';
(3) A transport container 1' with the top surface of its bottom plate 2' soaked in oil (rust-preventive oil) and a weight (for example, about 15 kg) placed on it, and (4) a transport container 1' stacked on top of a transport container 1' with the top surface of its bottom plate 2' soaked in oil (rust-preventive oil).
It was.
かかる実験より、従来の搬送容器１′では、中央部が沈下する方向への底板部２′の変形に対して、物品の重量よりも、油の浸透がより大きな影響を与えることが判明した。また、図５に、底板部２′の上面に油（防錆油）を浸した搬送容器１′における底板部２′の下方への変形量の分布を示す。図５において最も濃い網掛け部である第１分布域Ａ１では、底板部２′の下方への変形量が１６．０－１４．０ｍｍであった。２番目に濃い網掛け部である第２分布域Ａ２では、底板部２′の下方への変形量が１４．０－９．０ｍｍであった。３番目に濃い網掛け部である第３分布域Ａ３では、底板部２′の下方への変形量が９．０－４．５ｍｍであった。最も薄い網掛け部である第４分布域Ａ４では、底板部２′の下方への変形量が４．５－２．５ｍｍであった。更に、底板部２′の上面に油（防錆油）を浸して恒温槽（例えば、８０℃の環境下）内に所定時間（例えば、６日間）だけ置かれた搬送容器１′では、中央部が沈下する方向への底板部２′の変形により、下側の搬送容器１の開口等に遊嵌される４つのリブ部５のうちの隣り合う２つのリブ部５の幅Ｌ１およびＬ２（＝Ｌ１）の平均値が、油を浸す前の値（２９３．００～２９３．５ｍｍ）よりも大きくなり、許容値（一対の側壁部３同士等の開口部における間隔、ここでは、３００ｍｍ）を越えた値（３００．３ｍｍ）になった。 These experiments revealed that in a conventional transport container 1', oil penetration has a greater effect than the weight of the items on the deformation of the bottom plate 2' in the direction of sinking of the center. Figure 5 also shows the distribution of downward deformation of the bottom plate 2' in a transport container 1' with oil (rust-preventive oil) soaked on the top surface of the bottom plate 2'. In the first distribution area A1, the darkest shaded area in Figure 5, the downward deformation of the bottom plate 2' was 16.0-14.0 mm. In the second distribution area A2, the second darkest shaded area, the downward deformation of the bottom plate 2' was 14.0-9.0 mm. In the third distribution area A3, the third darkest shaded area, the downward deformation of the bottom plate 2' was 9.0-4.5 mm. In the fourth distribution area A4, the lightest shaded area, the downward deformation of the bottom plate 2' was 4.5-2.5 mm. Furthermore, when a transport container 1' is placed in a thermostatic bath (for example, in an 80°C environment) for a predetermined period of time (for example, six days) with the top surface of the bottom plate 2' immersed in oil (rust prevention oil), deformation of the bottom plate 2' causes the center to sink, causing the average width L1 and L2 (= L1) of two adjacent rib portions 5 of the four rib portions 5 that fit loosely into the opening of the lower transport container 1 to exceed the value before immersion in oil (293.00-293.5 mm), reaching a value (300.3 mm) that exceeds the allowable value (the distance between the openings of a pair of side walls 3, in this case 300 mm).
また、図６に示すように、第１分布域Ａ１は、搬送容器１′を上下方向からみて、２つの凹部７′の交差部側、すなわち底板部２′の中央部側で４つの格子状リブ部５′の外周面に接する第１四角形Ｓ１（本実施形態では、正方形）の内側、当該第１四角形Ｓ１の外接円ＯＣの内側、および外接円ＯＣの外接四角形ＳＯ（本実施形態では、正方形）の内側に包含される。更に、搬送容器１′を上下方向からみて、第１から第４分布域Ａ１－Ａ４は、４つの格子状リブ部５′の対角線により形成される第２四角形Ｓ２（本実施形態では、正方形）の内側に包含され、第２四角形Ｓ２を４５°回転させて外接円ＯＣの外接四角形ＳＯと向きを揃えた第３四角形Ｓ３（本実施形態では、正方形）の内側に概ね包含される。 As shown in FIG. 6, when the transfer container 1' is viewed from above, the first distribution area A1 is contained within a first rectangle S1 (a square in this embodiment) that contacts the outer peripheral surfaces of the four lattice-shaped ribs 5' at the intersection of the two recesses 7', i.e., the center of the bottom plate 2', the inside of the circumscribing circle OC of the first rectangle S1, and the inside of a circumscribing rectangle SO (a square in this embodiment) of the circumscribing circle OC. Furthermore, when the transfer container 1' is viewed from above, the first to fourth distribution areas A1-A4 are contained within a second rectangle S2 (a square in this embodiment) formed by the diagonals of the four lattice-shaped ribs 5', and are generally contained within a third rectangle S3 (a square in this embodiment) formed by rotating the second rectangle S2 by 45° to align its orientation with the circumscribing rectangle SO of the circumscribing circle OC.
これらの実験・解析結果を踏まえて、本発明者らは、本開示の搬送容器１の底板部２に対して、図７に示すように、上下方向からみて少なくとも上記第１四角形Ｓ１に重なり合うように厚肉部（凸状部）２０を形成することとした。厚肉部２０は、上下方向からみて上記内接円ＩＣ（円周により包囲される範囲）に重なり合うと共に、底板部２の側壁部３に沿って延在する領域２１よりも肉厚に形成されている。より詳細には、厚肉部２０は、上下方向からみて上記内接円ＩＣの円周に重なり合う外周と、当該外周から上記第１四角形Ｓ１、外接円ＯＣおよび外接四角形ＳＯの中心側に向かうにつれて上方に隆起する凸曲面状の上面とを有する。これにより、厚肉部２０の厚みは、外周から中心側に向かうにつれて漸増し、厚肉部２０の上面は、領域２１の上面から上方に突出する。図７に示す搬送容器１において、領域２１から厚肉部２０の頂部までの高さｈは、およそ５ｍｍである。 Based on these experimental and analytical results, the inventors decided to form a thick portion (convex portion) 20 on the bottom plate 2 of the transport container 1 of the present disclosure, as shown in FIG. 7, so as to overlap at least the first rectangle S1 when viewed from the top-bottom direction. The thick portion 20 overlaps the inscribed circle IC (the area surrounded by the circumference) when viewed from the top-bottom direction, and is formed to be thicker than the region 21 extending along the side wall 3 of the bottom plate 2. More specifically, the thick portion 20 has an outer periphery that overlaps the circumference of the inscribed circle IC when viewed from the top-bottom direction, and a convexly curved upper surface that rises upward from the outer periphery toward the centers of the first rectangle S1, circumscribed circle OC, and circumscribed rectangle SO. As a result, the thickness of the thick portion 20 gradually increases from the outer periphery toward the center, and the upper surface of the thick portion 20 protrudes upward from the upper surface of the region 21. In the transport container 1 shown in Figure 7, the height h from the region 21 to the top of the thick portion 20 is approximately 5 mm.
そして、本発明者らは、搬送容器１を複数試作し、上記（１）－（４）の評価条件下で当該搬送容器１を恒温槽（例えば、８０℃の環境下）内に所定時間（例えば、６日間）だけ置いて、底板部２の変形に対する油や物品の重量等の影響の度合いを評価した。その結果、図７に示す搬送容器１では、底板部２の上面に付着した油が当該底板部２に浸透した際に、図８に示すように、底板部２の中央部すなわち２つの凹部７の交差部が上方に隆起するように底板部２が変形する（反る）ことが判明した。かかる現象の発生要因としては、次の（１）－（４）が考えられる。
（１）底板部２の上面に直に接触する油の方が、底板部２の下面に接触する気化した油よりも速く底板部２内に浸透し、底板部２の上面側の範囲の膨潤は、底板部２の下面側の範囲の膨潤に比べて速く進行すること。
（２）厚肉部２０の上面を領域２１の上面から上方に突出させることで、厚肉部２０の上面の表面積が大きくなり、油との接触面積も大きくなるので、底板部２の上面側の範囲の膨潤が、従来の搬送容器１′の底板部２′に比べて速く進行すること。
（３）油の浸透に応じて凸曲面状の厚肉部２０の上面に沿って膨潤が進行することで、中央部が上方に隆起するように底板部２が変形しやすくなる（反りやすくなる）こと。
（４）底板部２の上面の中央部に下向き荷重を加えたときの当該底板部２の弾性率が高くなること。
The inventors then fabricated several prototype transfer containers 1 and placed the transfer containers 1 in a thermostatic chamber (for example, in an 80°C environment) for a predetermined period of time (for example, six days) under the evaluation conditions (1) to (4) above to evaluate the degree of influence of oil, the weight of the objects, and the like on the deformation of the bottom plate portion 2. As a result, it was found that in the transfer container 1 shown in Figure 7, when oil adhering to the upper surface of the bottom plate portion 2 penetrates into the bottom plate portion 2, the bottom plate portion 2 deforms (warps) so that the center of the bottom plate portion 2, i.e., the intersection of the two recesses 7, bulges upward, as shown in Figure 8. The following factors (1) to (4) are thought to be the causes of this phenomenon.
(1) Oil that comes into direct contact with the upper surface of the bottom plate portion 2 penetrates into the bottom plate portion 2 faster than vaporized oil that comes into contact with the lower surface of the bottom plate portion 2, and swelling of the upper surface area of the bottom plate portion 2 progresses faster than swelling of the lower surface area of the bottom plate portion 2.
(2) By protruding the upper surface of the thick-walled portion 20 upward from the upper surface of the region 21, the surface area of the upper surface of the thick-walled portion 20 is increased, and the contact area with the oil is also increased, so that swelling of the area on the upper surface side of the bottom plate portion 2 progresses more quickly than in the bottom plate portion 2' of a conventional transport container 1'.
(3) As the oil penetrates, swelling progresses along the upper surface of the convexly curved thick portion 20, making the bottom plate portion 2 more likely to deform (warp) so that the central portion bulges upward.
(4) The elastic modulus of the bottom plate portion 2 increases when a downward load is applied to the center of the upper surface of the bottom plate portion 2.
これにより、搬送容器１では、底板部２に油が浸透した際に、底板部２の中央部が上方に隆起するように当該底板部２を変形させて、図８に示すように、各リブ部５が外方に張り出すのを抑制することができる。従って、複数の搬送容器１が段積みされた際に、上側の搬送容器１（底板部２）が物品に付着した油の影響により変形していたとしても、当該上側の搬送容器１の各リブ部５の外周面と、上記当接面６に当接した下側の搬送容器１の側壁部３の内面あるいは下側の搬送容器１に装着された蓋体の内面とのクリアランスＣを十分に確保することが可能になる。更に、搬送容器１では、高い耐油性をもったナイロン系樹脂といった高価な樹脂を採用することなく、物品に付着した油の悪影響を低減することができる。この結果、搬送容器１では、コストアップを抑制しつつ、段積み性や取り出し性を良好に確保することが可能になる。 As a result, when oil penetrates the bottom plate portion 2 of the transport container 1, the bottom plate portion 2 is deformed so that the center of the bottom plate portion 2 bulges upward, preventing the ribs 5 from protruding outward, as shown in FIG. 8 . Therefore, when multiple transport containers 1 are stacked, even if the upper transport container 1 (bottom plate portion 2) is deformed due to oil adhering to an item, sufficient clearance C can be maintained between the outer surface of each rib portion 5 of the upper transport container 1 and the inner surface of the side wall portion 3 of the lower transport container 1 abutting the abutment surface 6 or the inner surface of the lid attached to the lower transport container 1. Furthermore, the transport container 1 can reduce the adverse effects of oil adhering to items without using expensive resins such as nylon-based resins with high oil resistance. As a result, the transport container 1 can ensure good stackability and ease of removal while preventing costs from increasing.
また、搬送容器１において、厚肉部２０は、上下方向からみて、４つのリブ部５の対角線により形成される第２四角形Ｓ２の内接円ＩＣに重なり合うように底板部２に形成される。これにより、油の影響により２つの凹部７の交差部（中央部）が沈下するように底板部２が変形するのを極めて良好に抑制することが可能になる。 In addition, in the transport container 1, the thick-walled portion 20 is formed on the bottom plate portion 2 so that, when viewed from the top and bottom, it overlaps with the inscribed circle IC of the second quadrangle S2 formed by the diagonals of the four rib portions 5. This makes it possible to extremely effectively prevent the bottom plate portion 2 from deforming due to the influence of oil, causing the intersection (center) of the two recesses 7 to sink.
更に、搬送容器１において、厚肉部２０は、上下方向からみて、４つのリブ部５の対角線により形成される第２四角形Ｓ２を４５°回転させて第１四角形Ｓ１の外接円ＯＣに外接する外接四角形ＳＯと向きを揃えた第３四角形Ｓ３の内側（第３四角形Ｓ３の外周上を含む）に含まれるように搬送容器１の底板部２に形成されてもよい。すなわち、厚肉部２０の外周は、上下方向からみて第３四角形Ｓ３の外周に重なり合ってもよい。これにより、物品の搭載性等への影響を良好に低減しつつ、底板部２に厚肉部２０を形成することが可能になる。 Furthermore, in the transport container 1, the thick-walled portion 20 may be formed on the bottom plate 2 of the transport container 1 so as to be included inside (including on the outer periphery of) a third rectangle S3 which is aligned with the circumscribed rectangle SO circumscribing the circumscribed circle OC of the first rectangle S1 by rotating the second rectangle S2 formed by the diagonals of the four rib portions 5 by 45° when viewed from the top-bottom direction. In other words, the outer periphery of the thick-walled portion 20 may overlap the outer periphery of the third rectangle S3 when viewed from the top-bottom direction. This makes it possible to form the thick-walled portion 20 on the bottom plate 2 while effectively reducing the impact on the ability to mount items, etc.
また、搬送容器１、すなわち複数のリブ部５を含む底板部２および側壁部３は、ポリプロピレン系樹脂により一体に形成される。これにより、搬送容器１のコストアップを良好に抑制することが可能になる。ただし、搬送容器１は、ポリプロピレン系樹脂以外の樹脂により形成されてもよく、例えばポリオレフィン系樹脂により形成されてもよい。また、搬送容器１は、その他のポリオレフィン系樹脂のリサイクル材により形成されてもよい。 Furthermore, the transport container 1, i.e., the bottom plate portion 2 and side wall portion 3 including the multiple rib portions 5, are integrally formed from a polypropylene-based resin. This effectively prevents increases in the cost of the transport container 1. However, the transport container 1 may be formed from a resin other than a polypropylene-based resin, such as a polyolefin-based resin. The transport container 1 may also be formed from recycled materials of other polyolefin-based resins.
更に、厚肉部２０が形成された底板部２を含む搬送容器１では、当該搬送容器１内の物品の重量による底板部２の下方（中央部が沈下する方向）への変形をも抑制することが可能になる。また、厚肉部２０が形成された底板部２を含む搬送容器１では、当該搬送容器１に高温の物品が収容されても、底板部２の下方（中央部が沈下する方向）への変形を抑制することができる。 Furthermore, in a transport container 1 including a bottom plate 2 on which a thick portion 20 is formed, it is possible to suppress downward deformation of the bottom plate 2 (in the direction in which the center portion sinks) due to the weight of items inside the transport container 1. Furthermore, in a transport container 1 including a bottom plate 2 on which a thick portion 20 is formed, it is possible to suppress downward deformation of the bottom plate 2 (in the direction in which the center portion sinks) even when high-temperature items are stored in the transport container 1.
なお、搬送容器１の底板部２は、図９に示す厚肉部２０Ｂを含むものであってもよい。同図に示す厚肉部２０Ｂは、上下方向からみて上記内接円ＩＣの円周または上記第３四角形Ｓ３の外周に重なり合う外周と、上下方向からみて上記外接円ＯＣまたは外接四角形ＳＯに重なり合うと共に領域２１よりも肉厚の一様な（同一の）厚みを有する平坦部と、外周から平坦部に向かうにつれて厚みが漸増するように形成された傾斜部とを含む。すなわち、厚肉部２０Ｂは、領域２１の上面から上方に突出する円錐台状または四角錐台状の上面を有する。かかる厚肉部２０Ｂが底板部２に形成された搬送容器１においても、底板部２に油が浸透した際に、中央部すなわち２つの凹部７の交差部が上方に隆起するように底板部２を変形させることが可能になる。 The bottom plate 2 of the transfer container 1 may include a thick portion 20B as shown in FIG. 9. The thick portion 20B shown in FIG. 9 includes an outer periphery that overlaps the circumference of the inscribed circle IC or the outer periphery of the third rectangle S3 when viewed from above; a flat portion that overlaps the circumscribed circle OC or the circumscribed rectangle SO when viewed from above and has a uniform (same) thickness that is thicker than region 21; and an inclined portion that gradually increases in thickness from the outer periphery toward the flat portion. That is, the thick portion 20B has a truncated cone-shaped or truncated pyramid-shaped upper surface that protrudes upward from the upper surface of region 21. Even in a transfer container 1 with such a thick portion 20B formed in the bottom plate 2, when oil penetrates the bottom plate 2, it is possible to deform the bottom plate 2 so that the center, i.e., the intersection of the two recesses 7, rises upward.
また、搬送容器１の底板部２は、図１０に示す厚肉部２０Ｃを含むものであってもよい。同図に示す厚肉部２０Ｃは、上下方向からみて上記内接円ＩＣの円周または上記第３四角形Ｓ３の外周に重なり合う外周を有し、当該外周の内側全体が領域２１よりも肉厚の一様な（同一の）厚みを有するように形成されている。かかる厚肉部２０Ｃが底板部２に形成された搬送容器１においても、底板部２に油が浸透した際に、中央部すなわち２つの凹部７の交差部が上方に隆起するように底板部２を変形させることが可能になる。本発明者等の評価によれば、上下方向からみて上記第３四角形Ｓ３の外周に重なり合う外周を有する厚肉部２０Ｃを含む搬送容器１の上面に油（防錆油）を浸して恒温槽（例えば、８０℃の環境下）内に所定時間（例えば、６日間）だけ置いた場合、中央部が上方に隆起する方向への底板部２の変形により、下側の搬送容器１の開口等に遊嵌される４つのリブ部５のうちの隣り合う２つのリブ部５の幅Ｌ１およびＬ２（＝Ｌ１）の平均値が、油を浸す前の値（２９３．００～２９３．５ｍｍ）よりも大きくなったが、許容値（３００ｍｍ）を越えることはなく、幅Ｌ１，Ｌ２の平均値は、およそ２９８ｍｍであった。また、本発明者等の評価によれば、上下方向からみて上記外接四角形ＳＯの外周に重なり合う外周を有する厚肉部２０Ｃを含む搬送容器１の上面に油を浸して恒温槽（例えば、８０℃の環境下）内に所定時間（例えば、６日間）だけ置いた場合も、下側の搬送容器１の開口等に遊嵌される４つのリブ部５のうちの隣り合う２つのリブ部５の幅Ｌ１およびＬ２（＝Ｌ１）の平均値は、許容値（３００ｍｍ）未満に抑えられた。 The bottom plate portion 2 of the transport container 1 may also include a thick portion 20C as shown in Figure 10. The thick portion 20C shown in the figure has an outer periphery that overlaps the circumference of the inscribed circle IC or the outer periphery of the third quadrangle S3 when viewed from the top-bottom direction, and is formed so that the entire inside of the outer periphery has a uniform (same) thickness that is thicker than the region 21. Even in a transport container 1 having such a thick portion 20C formed in the bottom plate portion 2, when oil penetrates the bottom plate portion 2, it is possible to deform the bottom plate portion 2 so that the center portion, i.e., the intersection of the two recesses 7, rises upward. According to the evaluations of the inventors, when the upper surface of the transport container 1 including the thick-walled portion 20C having an outer periphery that overlaps the outer periphery of the third rectangle S3 when viewed from the top and bottom directions is immersed in oil (rust-preventive oil) and placed in a constant temperature bath (for example, in an environment of 80°C) for a predetermined period of time (for example, 6 days), the bottom plate portion 2 deforms in a direction in which the central portion bulges upward, and the average value of the widths L1 and L2 (= L1) of two adjacent rib portions 5 of the four rib portions 5 that fit loosely into the opening of the lower transport container 1 becomes larger than the value before immersion in oil (293.00 to 293.5 mm), but does not exceed the allowable value (300 mm), and the average value of the widths L1 and L2 is approximately 298 mm. Furthermore, according to the inventors' evaluation, even when the top surface of a transfer container 1 including a thick-walled portion 20C whose periphery overlaps the periphery of the circumscribed rectangle SO when viewed from the top and bottom is immersed in oil and placed in a constant temperature bath (for example, in an 80°C environment) for a predetermined period of time (for example, 6 days), the average value of the widths L1 and L2 (= L1) of two adjacent rib portions 5 out of the four rib portions 5 loosely fitted into the opening of the lower transfer container 1 is kept below the allowable value (300 mm).
更に、上記搬送容器１において、リブ部５は、格子状のリブを有するものには限られず、格子状のリブ以外の例えばハニカム状のリブを有するものであってもよい。また、搬送容器１は、リブ部５の代わりに、底板部２の上面側に凹部を形成するように底板部２の下面から下方に突出すると共に、リブを有さずに平坦な下面を有する凸部を含むものであってもよい。更に、搬送容器１は、４つのリブ部５を含むものには限られず、例えば、６以上の偶数個のリブ部５（凸部）を含むものであってもよい。この場合、底板部２の厚肉部は、２つの凹部を画成する４つのリブ部（凸部）ごとに複数設けられてもよく、２つの凹部を画成する４つのリブ部（凸部）ごとに定められる上記第１四角形のすべてを包含するように底板部２に対して１つだけ設けられてもよい。 Furthermore, in the above-mentioned transport container 1, the rib portions 5 are not limited to those having lattice-like ribs, and may be those having ribs other than lattice-like ribs, for example, honeycomb-like ribs. Furthermore, instead of the rib portions 5, the transport container 1 may include convex portions that protrude downward from the underside of the bottom plate portion 2 to form concave portions on the upper surface side of the bottom plate portion 2, and have a flat underside without ribs. Furthermore, the transport container 1 is not limited to those having four rib portions 5, and may include, for example, an even number of rib portions 5 (convex portions), six or more. In this case, the bottom plate portion 2 may have multiple thick portions for each of the four rib portions (convex portions) that define two concave portions, or only one thick portion may be provided for the bottom plate portion 2 so as to encompass all of the first rectangles defined by the four rib portions (convex portions) that define two concave portions.
以上説明したように、本開示の搬送容器は、樹脂により形成され、底板部（２）と、前記底板部（２）の周縁部から上方に延出された側壁部（３）とを含む搬送容器（１）において、互いに交差する２つの凹部（７）を画成するように前記底板部（２）の下面から間隔をおいて下方に突出する４つの凸部（５）と、前記４つの凸部（５）を介して互いに対向するように前記底板部（２）の下面の外周部に形成され、それぞれ他の前記搬送容器（１）の前記側壁部（３）の上端面（３ｆ）に当接可能な少なくとも一対の当接面（６）とを含み、前記底板部（２）が、前記２つの凹部（７）の交差部側で前記４つの凸部（５）の外周面に接する四角形（Ｓ１）に上下方向からみて重なり合うと共に前記底板部（２）の前記側壁部（３）に沿って延在する領域（２１）よりも肉厚に形成された厚肉部（２０，２０Ｂ，２０Ｃ）を含むものである。 As explained above, the transport container of the present disclosure is a transport container (1) formed from resin and including a bottom plate portion (2) and a side wall portion (3) extending upward from the peripheral edge of the bottom plate portion (2), and includes four convex portions (5) protruding downward at intervals from the underside of the bottom plate portion (2) to define two intersecting recesses (7), and four convex portions (5) formed on the outer periphery of the underside of the bottom plate portion (2) so as to face each other via the four convex portions (5), Each of the containers includes at least one pair of contact surfaces (6) that can contact the upper end surface (3f) of the side wall portion (3) of the other transport container (1), and the bottom plate portion (2) includes thick-walled portions (20, 20B, 20C) that overlap, when viewed from above, a rectangle (S1) that contacts the outer peripheral surfaces of the four protrusions (5) on the intersection side of the two recesses (7) and are thicker than the region (21) extending along the side wall portion (3) of the bottom plate portion (2).
本開示の搬送容器の底板部は、４つの凸部と、少なくとも一対の当接面とを含む。４つの凸部は、互いに交差する２つの凹部を画成するように底板部の下面から間隔をおいて下方に突出する。一対の当接面は、４つの凸部を介して互いに対向するように底板部の下面の外周部に形成され、それぞれ他の搬送容器の側壁部の上端面に当接可能である。更に、搬送容器の底板部は、２つの凹部の交差部側で４つの凸部の外周面に接する四角形に上下方向からみて重なり合う厚肉部を含む。当該厚肉部は、底板部の側壁部に沿って延在する領域よりも肉厚に形成される。これにより、本開示の搬送容器では、底板部に油が浸透した際に、２つの凹部の交差部が上方に隆起するように当該底板部を変形させて、搬送容器の各凸部が外方に張り出すのを抑制することができる。従って、複数の搬送容器が段積みされた際に、上側の搬送容器の底板部が油の影響により変形していたとしても、当該上側の搬送容器の各凸部（外周面）と、当接面に当接した下側の搬送容器の側壁部（内面）とのクリアランスを十分に確保することが可能になる。更に、本開示の搬送容器では、高い耐油性をもった高価な樹脂を採用することなく、物品に付着した油の悪影響を低減することができる。この結果、本開示の搬送容器では、コストアップを抑制しつつ、段積み性や取り出し性を良好に確保することが可能になる。 The bottom plate portion of the transport container of the present disclosure includes four protrusions and at least one pair of abutment surfaces. The four protrusions protrude downward at a distance from the underside of the bottom plate portion to define two intersecting recesses. The pair of abutment surfaces is formed on the outer periphery of the underside of the bottom plate portion so as to face each other via the four protrusions, and each is capable of abutting against the upper end surface of the side wall portion of another transport container. Furthermore, the bottom plate portion of the transport container includes a thick-walled portion that overlaps in a vertical direction in a quadrangle that contacts the outer periphery of the four protrusions on the side of the intersection of the two recesses. The thick-walled portion is formed thicker than the region extending along the side wall portion of the bottom plate portion. As a result, in the transport container of the present disclosure, when oil penetrates the bottom plate portion, the intersection of the two recesses deforms the bottom plate portion so that the intersection of the two recesses rises upward, preventing each protrusion of the transport container from protruding outward. Therefore, when multiple transport containers are stacked, even if the bottom plate of the upper transport container is deformed due to the effects of oil, it is possible to ensure sufficient clearance between each convex portion (outer peripheral surface) of the upper transport container and the side wall portion (inner surface) of the lower transport container that abuts against the abutting surface. Furthermore, the transport container of the present disclosure can reduce the adverse effects of oil adhering to items without using expensive resins with high oil resistance. As a result, the transport container of the present disclosure can ensure good stackability and ease of removal while suppressing cost increases.
また、前記凸部（５）は、角丸長方形状の断面形状を有する格子状リブ部であってもよく、前記厚肉部（２０，２０Ｂ，２０Ｃ）は、前記上下方向からみて、前記４つの凸部（５）の対角線により形成される第２の四角形（Ｓ２）の内接円（ＩＣ）に重なり合うように前記底板部（２）に形成されてもよい。 Furthermore, the convex portions (5) may be lattice-shaped rib portions having a cross-sectional shape of a rounded rectangle, and the thick portions (20, 20B, 20C) may be formed on the bottom plate portion (2) so as to overlap the inscribed circle (IC) of a second quadrangle (S2) formed by the diagonals of the four convex portions (5) when viewed from the top-bottom direction.
これにより、油の影響により２つの凹部の交差部が沈下するように底板部が変形するのを極めて良好に抑制することが可能になる。 This effectively prevents the bottom plate from deforming due to the influence of oil, causing the intersection of the two recesses to sink.
前記厚肉部（２０，２０Ｂ，２０Ｃ）は、前記上下方向からみて、前記４つの凸部（５）の対角線により形成される第２の四角形（Ｓ２）を回転させて前記四角形（Ｓ１）の外接円（ＯＣ）に外接する外接四角形（ＳＯ）と向きを揃えた第３の四角形（Ｓ３）の内側に含まれるように前記底板部（２）に形成されてもよい。 The thick portions (20, 20B, 20C) may be formed on the bottom plate portion (2) so that, when viewed from the top-bottom direction, the second rectangle (S2) formed by the diagonals of the four protrusions (5) is rotated to be included inside a third rectangle (S3) aligned with a circumscribed rectangle (SO) circumscribing the circumscribed circle (OC) of the rectangle (S1).
これにより、物品の搭載性等への影響を良好に低減しつつ、底板部に厚肉部を形成することが可能になる。 This makes it possible to form a thick section in the bottom plate while effectively reducing the impact on the ability to mount items, etc.
前記厚肉部（２０，２０Ｂ）は、外周側から中心側に向かうにつれて厚みが漸増するように形成されてもよい。 The thick-walled portions (20, 20B) may be formed so that their thickness gradually increases from the outer periphery toward the center.
前記厚肉部（２０Ｃ）は、一様な厚みを有するものであってもよい。 The thick portion (20C) may have a uniform thickness.
前記厚肉部（２０，２０Ｂ，２０Ｃ）の上面は、前記底板部（２）の前記側壁部（３）に沿って延在する前記領域（２１）の上面から上方に突出するものであってもよい。 The upper surfaces of the thick portions (20, 20B, 20C) may protrude upward from the upper surface of the region (21) extending along the side wall portion (3) of the bottom plate portion (2).
そして、本開示の発明は上記実施形態に何ら限定されるものではなく、本開示の外延の範囲内において様々な変更をなし得ることはいうまでもない。更に、上記実施形態は、あくまで発明の概要の欄に記載された発明の具体的な一形態に過ぎず、発明の概要の欄に記載された発明の要素を限定するものではない。 The invention of this disclosure is in no way limited to the above-described embodiment, and it goes without saying that various modifications can be made within the scope of this disclosure. Furthermore, the above-described embodiment is merely one specific form of the invention described in the Summary of the Invention section, and does not limit the elements of the invention described in the Summary of the Invention section.
本開示の発明は、搬送容器の製造産業等において利用可能である。 The disclosed invention can be used in industries such as transport container manufacturing.
１ 搬送容器、２ 底板部、２０，２０Ｂ，２０Ｃ 厚肉部、２１ 領域、３ 側壁部、３ｆ フランジ部、５ リブ部、６ 当接面、７ 凹部、Ｃ クリアランス、Ｓ１ 第１四角形、Ｓ２ 第２四角形、Ｓ３ 第３四角形、ＳＯ 外接四角形、ＩＣ 内接円、ＯＣ 外接円。 1: Transport container, 2: Bottom plate portion, 20, 20B, 20C: Thick portion, 21: Area, 3: Side wall portion, 3f: Flange portion, 5: Rib portion, 6: Contact surface, 7: Recess, C: Clearance, S1: First rectangle, S2: Second rectangle, S3: Third rectangle, SO: Circumscribed rectangle, IC: Inscribed circle, OC: Circumscribed circle.
Claims (6)
互いに交差する２つの凹部を画成するように前記底板部の下面から間隔をおいて下方に突出する少なくとも４つの凸部と、
前記各凸部を介して互いに対向するように前記底板部の下面の外周部に形成され、それぞれ他の前記搬送容器の前記側壁部の上端面に当接可能な少なくとも一対の当接面とを備え、
前記底板部は、互いに隣り合う４つの前記凸部により画成される２つの凹部の交差部の全てにおいて、上下方向からみて、当該４つの凸部の外周面に接する四角形を包含するように重なり合うと共に前記底板部の前記側壁部に沿って延在する領域よりも肉厚に形成された厚肉部を含み、
前記厚肉部の上面は、前記底板部の前記側壁部に沿って延在する前記領域の上面から上方に突出する、搬送容器。 A transport container made of resin and including a bottom plate portion and a side wall portion extending upward from a peripheral edge portion of the bottom plate portion,
at least four projections projecting downwardly at intervals from the lower surface of the base plate portion so as to define two recesses intersecting each other;
at least one pair of contact surfaces formed on the outer periphery of the lower surface of the bottom plate portion so as to face each other via the respective convex portions, the contact surfaces being capable of contacting the upper end surfaces of the side wall portions of the other transport containers,
the bottom plate portion includes, at all intersections of two recesses defined by the four adjacent protrusions, thick portions that overlap so as to encompass a quadrangle that contacts the outer peripheral surfaces of the four protrusions when viewed from the top-bottom direction, and that are formed thicker than a region extending along the side wall portion of the bottom plate portion ;
The transport container has an upper surface of the thick portion that protrudes upward from an upper surface of the region that extends along the side wall portion of the bottom plate portion .
前記凸部は、角丸長方形状の断面形状を有する格子状リブ部である、搬送容器。 2. The transport container according to claim 1,
The transport container, wherein the convex portion is a lattice-shaped rib portion having a cross section of a rounded rectangular shape.
前記厚肉部は、前記上下方向からみて、前記４つの凸部の対角線により形成される第２の四角形の内接円に重なり合うように前記底板部に形成される搬送容器。The thick-walled portion is formed on the bottom plate portion so as to overlap the inscribed circle of a second rectangle formed by the diagonals of the four protrusions when viewed from the top-bottom direction.
前記厚肉部は、前記上下方向からみて、前記４つの凸部の対角線により形成される第２の四角形を回転させて前記四角形の外接円に外接する外接四角形と向きを揃えた第３の四角形の内側に含まれるように前記底板部に形成される搬送容器。 2. The transport container according to claim 1,
The thick-walled portion is a transport container formed on the bottom plate portion so that, when viewed from the top-bottom direction, it is included inside a third rectangle formed by rotating a second rectangle formed by the diagonals of the four protrusions and aligning its orientation with a circumscribing rectangle that circumscribes the circumscribing circle of the second rectangle.
前記厚肉部は、外周側から中心側に向かうにつれて厚みが漸増するように形成されている搬送容器。 2. The transport container according to claim 1,
The thick-walled portion is formed so that the thickness gradually increases from the outer periphery toward the center.
前記厚肉部は、一様な厚みを有する搬送容器。
2. The transport container according to claim 1,
The thick-walled portion is a transport container having a uniform thickness.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2023052869 | 2023-03-29 | ||
| JP2023052869 | 2023-03-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2024144277A JP2024144277A (en) | 2024-10-11 |
| JP7791233B2 true JP7791233B2 (en) | 2025-12-23 |
Family
ID=92977529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2024046807A Active JP7791233B2 (en) | 2023-03-29 | 2024-03-22 | Transport container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP7791233B2 (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002046735A (en) | 2000-08-04 | 2002-02-12 | Sanko Co Ltd | Folding container |
| JP2003128179A (en) | 2001-10-29 | 2003-05-08 | Ibm Japan Business Logistics Co Ltd | Item storage tray |
| JP2005001739A (en) | 2003-06-13 | 2005-01-06 | Renesas Technology Corp | Semiconductor device storage tray and semiconductor device transport method using the same |
| JP2008273563A (en) | 2007-04-27 | 2008-11-13 | Mitsubishi Plastics Ind Ltd | Transport container |
| JP2011042397A (en) | 2009-08-24 | 2011-03-03 | Dainippon Printing Co Ltd | Plastic vessel |
| JP2012111213A (en) | 2010-11-29 | 2012-06-14 | Richell Corp | Method for producing molding by transfer molding method and molding produced by this method |
| JP2013133120A (en) | 2011-12-26 | 2013-07-08 | Kyocera Corp | Tray for storing concurrently produced component set |
| JP2015024563A (en) | 2013-07-26 | 2015-02-05 | シチズン電子株式会社 | Injection mold |
| JP2019218089A (en) | 2018-06-19 | 2019-12-26 | 三甲株式会社 | container |
| JP2021195137A (en) | 2020-06-10 | 2021-12-27 | 岐阜プラスチック工業株式会社 | Transport container |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54113830U (en) * | 1978-01-27 | 1979-08-10 | ||
| JPS57177925U (en) * | 1981-05-02 | 1982-11-11 | ||
| JPH0353431U (en) * | 1989-09-29 | 1991-05-23 |
-
2024
- 2024-03-22 JP JP2024046807A patent/JP7791233B2/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002046735A (en) | 2000-08-04 | 2002-02-12 | Sanko Co Ltd | Folding container |
| JP2003128179A (en) | 2001-10-29 | 2003-05-08 | Ibm Japan Business Logistics Co Ltd | Item storage tray |
| JP2005001739A (en) | 2003-06-13 | 2005-01-06 | Renesas Technology Corp | Semiconductor device storage tray and semiconductor device transport method using the same |
| JP2008273563A (en) | 2007-04-27 | 2008-11-13 | Mitsubishi Plastics Ind Ltd | Transport container |
| JP2011042397A (en) | 2009-08-24 | 2011-03-03 | Dainippon Printing Co Ltd | Plastic vessel |
| JP2012111213A (en) | 2010-11-29 | 2012-06-14 | Richell Corp | Method for producing molding by transfer molding method and molding produced by this method |
| JP2013133120A (en) | 2011-12-26 | 2013-07-08 | Kyocera Corp | Tray for storing concurrently produced component set |
| JP2015024563A (en) | 2013-07-26 | 2015-02-05 | シチズン電子株式会社 | Injection mold |
| JP2019218089A (en) | 2018-06-19 | 2019-12-26 | 三甲株式会社 | container |
| JP2021195137A (en) | 2020-06-10 | 2021-12-27 | 岐阜プラスチック工業株式会社 | Transport container |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2024144277A (en) | 2024-10-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1325609C (en) | Moving and storage container | |
| US3638824A (en) | Plastic container | |
| KR20120070505A (en) | Containment tray | |
| CA3040963A1 (en) | Egg carton with lugless denest-feature and related methods | |
| JP7791233B2 (en) | Transport container | |
| US12054313B2 (en) | Tote with side wall drain holes | |
| US5263583A (en) | Transporting IC-packages | |
| US2974847A (en) | Packages or cartons for eggs and other fragile articles | |
| JPH0427819Y2 (en) | ||
| KR100432183B1 (en) | Container for containing egg crates | |
| JP2013049466A (en) | Storage tray | |
| WO2012058676A2 (en) | Substrate shipper | |
| JP4105306B2 (en) | Transport container | |
| US5261537A (en) | Container | |
| JP2025161092A (en) | container | |
| RU2676985C1 (en) | Egg packaging | |
| JP3655404B2 (en) | Storage container | |
| JP2026031101A (en) | packaging container | |
| JPH0326126Y2 (en) | ||
| JP4933820B2 (en) | Storage tray | |
| JP7526696B2 (en) | Lid | |
| JP4118410B2 (en) | Transport container | |
| JP4054904B2 (en) | Egg packaging container | |
| JPH0920339A (en) | Lidded container | |
| JP6887653B2 (en) | Lid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20240322 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A821 Effective date: 20240325 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20250527 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20250718 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20250826 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20251024 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20251118 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20251211 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 7791233 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |