JP2004136953A

JP2004136953A - Tray box

Info

Publication number: JP2004136953A
Application number: JP2002304983A
Authority: JP
Inventors: Hisashi Tsuchiya; 土谷　恒
Original assignee: Tomoku KK
Current assignee: Tomoku KK
Priority date: 2002-10-18
Filing date: 2002-10-18
Publication date: 2004-05-13

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tray box whose body has double walls at all sides that provide the tray box with stack strength. <P>SOLUTION: The tray box 1 is shaped by folding a plate and is used for holding a plurality of arranged articles. A bottom board is formed almost in the center of the plate material, and side boards 4, 10 are formed consecutively along respective side edges of the bottom board via folding lines and raised vertically to form the tray body. An inner board is formed consecutively along one side edge of each side board 4, 10 via each folding line into a shape almost identical with the side board 4, 10 next to the inner board. The inner boards are folded and superimposed on the interior of the adjacent side boards 4, 10, respectively. Meanwhile, folding back boards 6, 12 are formed consecutively along the top edge of respective side boards 4, 10 via folding lines. The folding back boards 6, 12 are folded downward to sandwich the inner boards between the folding back boards 6, 12 and the side boards 4, 10, respectively, thus shape the box 1. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、板材を折り曲げることにより組立てられ、複数の物品を配列して収容するトレー箱に関する。
【０００２】
【従来の技術】
従来、打抜き形成された板材を折り曲げることにより組立てられ、複数の物品を配列して収容するトレー箱が知られている。
【０００３】
このようなトレー箱は、板材の略中央に矩形状の底板が形成されている。そして、前後の側縁に折目線を介して連設された前後の側板を垂直に起立させる。そして、前後の両側板の両側縁に折目線を介してそれぞれ連設された左右の内側板を直角に内側に折り曲げ、対向する左右の内側板を重ね合わせる。
【０００４】
そして、前記前後の側板の左右の側縁に折目線を介して連設された左右の側板を垂直に起立させる。そして、左右の側板の先端縁に折目線を介して連設された一対の折返板を、該折返板と左右の側板との間に、重ね合わせた左右の内側板を挟み込むように、下方へ折り返して組み立てる（例えば、特許文献１参照。）。
【０００５】
しかしながら、このようなトレー箱の場合、前後の側板は、内側に内側板を備えないのに対し、左右の側板は、内側に内短側板を２枚備えるため、トレー箱を上下に積み重ねた場合、前後の側板の箇所に荷重が集中するとトレー箱が潰れ易いという問題がある。
【０００６】
【特許文献１】
特開２００１−１１４２５３号公報（第５頁、第２図）
【０００７】
【発明が解決しようとする課題】
本発明は上記背景を鑑みてなされたものであり、胴部のすべての面が２重壁となり、積重強度の高いトレー箱を提供することを目的とする。
【０００８】
【課題を解決するための手段】
上記目的を達成するため、本発明のトレー箱は、板材を折り曲げることにより組立てられ、複数の物品を配列して収容するトレー箱であって、前記板材の略中央に底板を形成し、底板の各側縁に沿って折目線を介してそれぞれ連設された側板を垂直に起立させることにより胴部を形成し、各側板の一方の側端縁に沿って折目線を介してそれぞれ連設され、かつ、隣接する側板と略同一形状の内側板を折り曲げて、隣接する側板の内側に重ね合わせ、各側板の先端縁に沿って折目線を介してそれぞれ連設された折返板を、該折返板と該側板との間に該内側板を挟み込むように、下方へ折返して組み立てることを特徴とする。
【０００９】
各側板の内側には、すべて内側板が重ね合わせてあるため、各側板で形成される胴部のすべての面において均一の強度を有し、積重強度を向上させたトレー箱を提供することができる。
【００１０】
また、本発明は、前記板材の材料を段ボールとし、前記底板と前記側板と前記内側板とが略矩形状であることが好ましい。これにより、段ボール製の板材の中芯の波の向きが、側板と内側板とで異なり、互いの中芯の波の向きが交差する。従って、該トレー箱は、横方向の圧力に対しても充分な強度を発揮する。
【００１１】
また、本発明の前記折返板は、隣接する該折返板同士が係合することが好ましい。これにより、該トレー箱は、内側板が確実に側板と折返板との間に保持され、組立状態を維持し易い。
【００１２】
また、本発明のトレー箱は、前記側板先端の一方の側端部と内側板とに跨って先端に突出する第１突片が設けられ、該側板先端の他方の側端部には、先端に突出する第２突片が設けられ、前記底板の隅角部と側板と内側板とに亘って切取部を形成し、前記トレー箱を上下に積み重ねた際に、下のトレー箱の第１、第２突片が、上のトレー箱の切取部により形成された空間に差し込まれることが好ましい。これにより、本発明のトレー箱を上下に積み重ねた場合に、位置決めが容易であり、積み重ねの安定性が向上される。
【００１３】
【発明の実施の形態】
本発明の実施の形態を図１から図３を参照して説明する。図１は本発明のトレー箱の一実施形態を示す組立図、図２は本実施形態のトレー箱の展開図、図３は本実施形態のトレー箱の組立説明図である。
【００１４】
本実施形態のトレー箱１は、図１に示すように、上部が開放された略直方体形状に形成されており、図示しないが、牛乳パック等の収納物を収納して複数個を積み重ね、収納物の運搬を行うものである。
【００１５】
トレー箱１は、図２に展開して示すように、略矩形状に打ち抜いた段ボールの板材２によって形成されている。一点鎖線は打ち抜く前の板材２の形状を示す。板材２の略中央部には略矩形状の底板３が形成されている。また、底板３の前後の側縁には折目線ａ，ｂを介して略矩形状の前後の側板４，５が連設されている。前後の側板４，５の先端部には、略楕円状の取手用孔部４ａ，５ａが形成されている。
【００１６】
前後の側板４，５の先端縁には、略段ボール１枚分の厚さの間隔で並設された一対の折目線ｃを介して、前後の折返板６がそれぞれ連設されている。前後の折返板６の先端縁には、折返板６を折目線ｃを介して内側下方に折り返した際に、取手用孔部４ａ，５ａと重なる部分を開口するよう切り取られた切取部６ａが形成されている。また、前後の折返板６基端の左右の側縁には、係合片６ｂが形成されている。
【００１７】
前側板４の右側縁には、折目線ｄを介して略矩形状の右内側板７が連設されている。前側板４先端縁の右側部には、右内側板７に跨って先端に突出する第１突片８ａが連設されている。また、前側板４先端縁の左側部には、先端に突出する第２突片８ｂが連設されている。
【００１８】
後側板５の左側縁には、折目線ｅを介して略矩形状の左内側板９が連設されている。後側板５先端縁の左側部には、左内側板９に跨って先端に突出する第１突片８ｃが連設されている。また、後側板５先端縁の右側部には、先端に突出する第２突片８ｄが連設されている。
【００１９】
底板３の左右の側縁には、一対の折目線ｆ，ｇを介して略矩形状の左右の側板１０，１１が設けられている。左右の側板１０，１１は、左右の内側板７，９と略同形状に形成されている。左右の側板１０，１１の先端縁には、略段ボール１枚分の厚さの間隔で並設された一対の折目線ｈを介して、左右の折返板１２がそれぞれ連設されている。左右の折返板１２基端部の左右の側縁には、係合溝１２ａが設けられている。
【００２０】
右側板１０の後側縁には、折目線ｉを介して略矩形状の後内側板１３が連設されている。後内側板１３は、後側板５と略同形状に形成されている。また、後内側板１３は、後側板５と重ね合わせた際に、取手用孔部５ａを開口するように、略楕円形状の取手用孔部１３ａが形成されている。右側板１０先端縁の後側部には、後内側板１３に跨って先端に突出する第１突片８ｅが連設されている。また、右側板１０先端縁の前側部には、先端に突出する第２突片８ｆが連設されている。
【００２１】
左側板１１の前側縁には、折目線ｊを介して略矩形状の前内側板１４が連設されている。前内側板１４は、前側板４と略同形状に形成されている。また、前内側板１４は、前側板４と重ね合わせた際に、取手用孔部４ａを開口するように、略楕円形状の取手用孔部１４ａが形成されている。左側板１１先端縁の前側部には、前内側板１４に跨って先端に突出する第１突片８ｇが連設されている。また、左側板１１先端縁の後側部には、先端に突出する第２突片８ｈが連設されている。
【００２２】
また、底板３の右前隅角部には、前側板４と右内側板７と右側板１０とに跨って略Ｌ字状の切取部１５ａが形成されている。同様に、底板３の左前隅角部と、右後隅角部と、左後隅角部とには、前側板４と左側板１１と前内側板１４と、後側板５と右側板１０と後内側板１３と、後側板５と内左側板９と左側板１１とにそれぞれ跨って、略Ｌ字状の切取部１５ｂ，１５ｃ，１５ｄがそれぞれ形成されている。また、参考として、左内側板９と左側板１１との一部を切り欠いて、中芯１６の波の向きを表示する。
【００２３】
次に、図３を参照して、本実施形態のトレー箱１の組立工程を説明する。
【００２４】
まず、図３（ａ）に示すように、前後左右の側板４，５，１０，１１を、折目線ａ，ｂ，ｆ，ｇを介して垂直に折り曲げる。これと同時に、右内側板７と、後内側板１３と、左内側板９と、前内側板１４とを、折目線ｄ，ｉ，ｅ，ｊを介して内側へ直角に折り曲げると共に、それぞれ右側板１０、後側板５、左側板１１、前側板４の内側に重ね合わせる。このとき、右内側板７と右側板１０と、後内側板１３と後側板５と、左内側板９と左側板１１と、前内側板１４と前側板４との各段ボール板材の中芯１６の波の向きが交差する。また、各取手用孔部１３ａ，１４ａは、それぞれ取手用孔部５ａ，４ａと重ね合わさって開口する。
【００２５】
そして、図３（ｂ）に示すように、両折返板１２を、左右の内側板７，９をそれぞれ挟み込むように、折目線ｈを介して内側へ下方に折り返す。同様に、両折返板６を、前後の内側板１３，１４を挟み込むように、折目線ｃを介して内側へ下方に折り返す。このとき、両切取部６ａは、それぞれ取手用孔部５ａ，１３ａ，４ａ，１４ａと重ね合わさって開口する。また、図１に示すように、各係合片６ｂが係合溝１２ａに差し込まれ、折返板６，１２が互いに係合する。
【００２６】
本実施形態に係るトレー箱１によれば、側板４，５，１０，１１と内側板７，９，１３，１４とにより胴部が構成される。従って、胴部の各面の厚さが段ボール板材２枚ずつで構成されるため、胴部の各面の積重強度は同一である。このため、どの面に荷重が集中したとしても常に一定の積重強度を発揮することができる。また、各側板４，５，１０，１１と、各内側板１４，１３，７，９との中芯１６の波の向きが交差するため、トレー箱の横方向の強度も向上され、トレー箱としての全体的な強度バランスが向上される。また、図２に一点鎖線で示すように、板材２を打ち抜く面積が少ないため、板材２の打抜き工程中に出るゴミが少なく無駄も少ない。
【００２７】
また、本実施形態においては、各折返板６，１２は、係合片６ｂと互いに係合しているため、組立状態を維持することができる。また、各折返板６，１２の先端は、底板３から間隔を存しているため、各折返板６，１２の先端に指をかけて引張することにより簡単に各折返板６，１２同士の係合を解除することができる。従って、トレー箱１を解体することが容易である。
【００２８】
さらに、各突片８ａ〜ｈは、トレー箱１を積み重ねた際に、上方のトレー箱１の略Ｌ字状切取部１５ａ〜１５ｄによってそれぞれ形成される空間に差し込まれる。これによって、本実施形態のトレー箱１を積み重ねた時の位置決めが容易であり、また、安定性の向上が図れる。
【図面の簡単な説明】
【図１】本発明のトレー箱の一実施形態を示す組立図。
【図２】本実施形態のトレー箱の展開図。
【図３】本実施形態のトレー箱の組立説明図。
【符号の説明】
１…トレー箱、　２…板材、　３…底板、　４…前側板、　５…後側板、　６…前後の折返板、　７…右内側板、　９…左内側板、　１０…右側板、　１１…左側板、　１２…左右の折返板、　１３…後内側板、　１４…前内側板。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a tray box that is assembled by bending a plate material and that arranges and stores a plurality of articles.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has been known a tray box which is assembled by bending a plate material formed by stamping and stores a plurality of articles arranged therein.
[0003]
In such a tray box, a rectangular bottom plate is formed substantially at the center of the plate material. Then, the front and rear side plates connected to the front and rear side edges via the fold line are vertically erected. Then, the left and right inner plates, which are respectively provided continuously on both side edges of the front and rear both plates via a fold line, are bent inward at a right angle, and the opposing left and right inner plates are overlapped.
[0004]
Then, the left and right side plates connected to the left and right side edges of the front and rear side plates via a fold line are vertically erected. Then, a pair of folded plates continuously provided at the leading edges of the left and right side plates via a fold line are sandwiched between the folded plates and the left and right side plates so as to sandwich the superimposed left and right inner plates. It is folded and assembled (for example, see Patent Document 1).
[0005]
However, in the case of such a tray box, the front and rear side plates do not have an inner plate inside, whereas the left and right side plates have two inner short side plates inside, so that the tray boxes are stacked up and down. If the load is concentrated on the front and rear side plates, the tray box is easily crushed.
[0006]
[Patent Document 1]
JP 2001-114253 A (page 5, FIG. 2)
[0007]
[Problems to be solved by the invention]
The present invention has been made in view of the above background, and it is an object of the present invention to provide a tray box having a high stacking strength in which all surfaces of a trunk have double walls.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the tray box of the present invention is a tray box that is assembled by bending a plate material and is arranged and accommodates a plurality of articles, wherein a bottom plate is formed substantially at the center of the plate material, The body is formed by vertically erecting the side plates that are respectively connected along the fold lines along the respective side edges, and are respectively connected along the fold lines along one side edge of each side plate. And, the inner side plate having substantially the same shape as the adjacent side plate is bent and overlapped on the inner side of the adjacent side plate, and the folded plates provided continuously along the leading edge of each side plate via a fold line are folded back. It is characterized by being folded downward so as to sandwich the inner plate between the plate and the side plate.
[0009]
Since the inner plates are all superimposed on the inside of each side plate, a tray box having uniform strength on all surfaces of the body formed by each side plate and having improved stacking strength is provided. Can be.
[0010]
Further, in the present invention, it is preferable that the material of the plate material is a corrugated cardboard, and the bottom plate, the side plate, and the inner plate are substantially rectangular. Thereby, the direction of the wave of the core of the corrugated board differs between the side plate and the inner plate, and the directions of the waves of the core intersect each other. Thus, the tray box exhibits sufficient strength against lateral pressure.
[0011]
Further, it is preferable that the folded plates of the present invention be adjacent to each other. Thereby, in the tray box, the inner plate is securely held between the side plate and the folded plate, and it is easy to maintain the assembled state.
[0012]
Further, the tray box of the present invention is provided with a first protruding piece protruding at the front end over one side end of the side plate front end and the inner plate, and the other side end of the side plate front end has a front end. A second protruding piece is provided to project from the corner of the bottom plate, the side plate and the inner plate, and when the tray boxes are stacked up and down, the first protruding piece of the lower tray box is formed. , The second projection is preferably inserted into the space formed by the cutout of the upper tray box. Thereby, when the tray boxes of the present invention are stacked up and down, positioning is easy and stacking stability is improved.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an assembly view showing an embodiment of the tray box of the present invention, FIG. 2 is an exploded view of the tray box of this embodiment, and FIG. 3 is an explanatory view of assembling the tray box of this embodiment.
[0014]
As shown in FIG. 1, the tray box 1 according to the present embodiment is formed in a substantially rectangular parallelepiped shape having an open upper portion. Is to be transported.
[0015]
As shown in FIG. 2, the tray box 1 is formed of a cardboard plate material 2 punched into a substantially rectangular shape. The dashed line indicates the shape of the plate 2 before punching. A substantially rectangular bottom plate 3 is formed at a substantially central portion of the plate material 2. Further, substantially rectangular front and rear side plates 4 and 5 are continuously provided on front and rear side edges of the bottom plate 3 via fold lines a and b. At the front end portions of the front and rear side plates 4 and 5, substantially elliptical handle holes 4a and 5a are formed.
[0016]
The front and rear folded plates 6 are respectively connected to the leading edges of the front and rear side plates 4 and 5 via a pair of fold lines c which are juxtaposed at an interval of approximately one cardboard thickness. At the leading edge of the front and rear folded plates 6, there is provided a cutout 6a which is cut out so as to open a portion overlapping the handle holes 4a and 5a when the folded plate 6 is folded inward and downward through the fold line c. Is formed. Engagement pieces 6b are formed on the left and right side edges of the base ends of the front and rear folded plates 6.
[0017]
A substantially rectangular right inner plate 7 is continuously provided on the right edge of the front plate 4 via a fold line d. On the right side of the front edge of the front plate 4, a first protruding piece 8 a protruding from the front end across the right inner plate 7 is continuously provided. A second protruding piece 8b protruding from the front end is continuously provided on the left side of the front end edge of the front plate 4.
[0018]
A substantially rectangular left inner plate 9 is continuously provided on the left edge of the rear plate 5 via a fold line e. On the left side of the front edge of the rear plate 5, a first protruding piece 8 c is provided continuously and protrudes to the front end across the left inner plate 9. A second protruding piece 8d protruding from the front end is continuously provided on the right side of the front end edge of the rear plate 5.
[0019]
The left and right side edges of the bottom plate 3 are provided with substantially rectangular left and right side plates 10 and 11 via a pair of fold lines f and g. The left and right side plates 10 and 11 are formed in substantially the same shape as the left and right inner plates 7 and 9. Left and right folded plates 12 are respectively connected to the leading edges of the left and right side plates 10 and 11 via a pair of fold lines h which are juxtaposed at intervals of a thickness of substantially one corrugated cardboard. Engagement grooves 12a are provided on the left and right side edges of the base end of the left and right folding plates 12.
[0020]
A substantially rectangular rear inner plate 13 is continuously provided on the rear side edge of the right side plate 10 via a fold line i. The rear inside plate 13 is formed in substantially the same shape as the rear side plate 5. The rear inner plate 13 has a substantially elliptical handle hole 13a so as to open the handle hole 5a when the rear inner plate 13 is overlapped with the rear plate 5. On the rear side of the front edge of the right side plate 10, a first protruding piece 8e that protrudes to the front end across the rear inner plate 13 is continuously provided. Further, a second protruding piece 8f protruding from the front end is continuously provided on the front side of the front end edge of the right side plate 10.
[0021]
A substantially rectangular front inner plate 14 is continuously provided on the front side edge of the left side plate 11 via a fold line j. The front inside plate 14 is formed in substantially the same shape as the front side plate 4. The front inner plate 14 is formed with a substantially elliptical handle hole 14a so as to open the handle hole 4a when the front inner plate 14 is overlapped with the front plate 4. On the front side of the front edge of the left side plate 11, a first protruding piece 8 g projecting to the front end across the front inner side plate 14 is continuously provided. A second protruding piece 8h protruding from the front end is continuously provided on the rear side of the front end edge of the left side plate 11.
[0022]
At the right front corner of the bottom plate 3, a substantially L-shaped cutout 15a is formed across the front side plate 4, the right inner plate 7, and the right side plate 10. Similarly, the left front corner, the right rear corner, and the left rear corner of the bottom plate 3 include a front plate 4, a left plate 11, a front inner plate 14, a rear plate 5, and a right plate 10, respectively. Substantially L-shaped cutouts 15b, 15c, and 15d are formed over the rear inner plate 13, the rear plate 5, the inner left plate 9, and the left plate 11, respectively. Further, as a reference, a part of the left inner plate 9 and the left side plate 11 is cut out, and the wave direction of the core 16 is displayed.
[0023]
Next, an assembly process of the tray box 1 of the present embodiment will be described with reference to FIG.
[0024]
First, as shown in FIG. 3A, the front, rear, left and right side plates 4, 5, 10, and 11 are vertically bent through fold lines a, b, f, and g. At the same time, the right inner plate 7, the rear inner plate 13, the left inner plate 9, and the front inner plate 14 are bent inward at right angles through the fold lines d, i, e, and j, and each is bent to the right. The plate 10, the rear plate 5, the left plate 11, and the front plate 4 are overlapped on the inside. At this time, the core 16 of the corrugated board material of the right inner plate 7, the right plate 10, the rear inner plate 13, the rear plate 5, the left inner plate 9, the left plate 11, the front inner plate 14, and the front plate 4 is provided. The directions of the waves intersect. Further, the handle holes 13a and 14a are opened by overlapping with the handle holes 5a and 4a, respectively.
[0025]
Then, as shown in FIG. 3 (b), the two folded plates 12 are folded inward downward through the fold line h so as to sandwich the left and right inner plates 7, 9 respectively. Similarly, the two folded plates 6 are folded inward downward through the fold line c so as to sandwich the front and rear inner plates 13 and 14 therebetween. At this time, both the cutouts 6a are opened by overlapping with the handle holes 5a, 13a, 4a, and 14a, respectively. Further, as shown in FIG. 1, each engaging piece 6b is inserted into the engaging groove 12a, and the folded plates 6, 12 are engaged with each other.
[0026]
According to the tray box 1 according to the present embodiment, the body is constituted by the side plates 4, 5, 10, 11 and the inner plates 7, 9, 13, 14. Therefore, since the thickness of each surface of the body is constituted by two corrugated board materials, the stacking strength of each surface of the body is the same. For this reason, even if the load is concentrated on any surface, a constant stacking strength can always be exhibited. Further, since the wave directions of the cores 16 of the side plates 4, 5, 10, 11 and the inner plates 14, 13, 7, 9 intersect, the strength of the tray box in the lateral direction is improved, and the tray box is improved. As a whole, the strength balance is improved. Further, as shown by a dashed line in FIG. 2, since the area for punching the plate 2 is small, there is little dust and less waste during the step of punching the plate 2.
[0027]
Further, in the present embodiment, since each of the turning plates 6 and 12 is engaged with the engaging piece 6b, the assembled state can be maintained. Further, since the leading ends of the folded plates 6 and 12 are spaced apart from the bottom plate 3, the folded plates 6 and 12 can be easily connected to each other by pulling the leading ends of the folded plates 6 and 12 with fingers. The engagement can be released. Therefore, it is easy to disassemble the tray box 1.
[0028]
Further, when the tray boxes 1 are stacked, the projecting pieces 8a to 8h are inserted into spaces respectively formed by the substantially L-shaped cutouts 15a to 15d of the upper tray box 1. Thereby, positioning when the tray boxes 1 of the present embodiment are stacked is easy, and stability can be improved.
[Brief description of the drawings]
FIG. 1 is an assembly view showing an embodiment of a tray box of the present invention.
FIG. 2 is a development view of the tray box of the embodiment.
FIG. 3 is an explanatory view of assembling the tray box of the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Tray box, 2 ... Board material, 3 ... Bottom plate, 4 ... Front side plate, 5 ... Rear side plate, 6 ... Front and back folded plate, 7 ... Right inner side plate, 9 ... Left inner side plate, 10 ... Right side plate, 11 ... Left side Board, 12: left and right folded boards, 13: rear inner board, 14: front inner board.

Claims

A tray box that is assembled by bending a plate material and arranges and accommodates a plurality of articles,
Forming a bottom plate substantially at the center of the plate material,
Forming the trunk by vertically erected side plates that are respectively connected along the fold lines along each side edge of the bottom plate,
Each side plate is continuously provided along a fold line along one side edge, and the inner plate having substantially the same shape as the adjacent side plate is bent, and the inner side plate is overlapped with the inside of the adjacent side plate,
Folded plates that are respectively provided along the fold line along the leading edge of each side plate are folded downward and assembled so as to sandwich the inner plate between the folded plate and the side plate. Tray box.

The tray box according to claim 1, wherein the plate material is made of cardboard, and the bottom plate, the side plates, and the inner plate are substantially rectangular.

3. The tray box according to claim 2, wherein the folded plates are adjacent to each other.

The tray box is provided with a first protruding piece that protrudes to the front end across one side end of the front end of the side plate and the inner plate, and protrudes to the front end at the other side end of the front end of the side plate. A second projecting piece is provided,
Forming a cutout portion over the corner portion of the bottom plate, the side plate and the inner plate,
4. The tray box according to claim 3, wherein when the tray boxes are stacked up and down, the first and second projections of the lower tray box are inserted into the space formed by the cutout of the upper tray box. Tray box.