JP2020075738A - tray - Google Patents

Abstract

To provide a tray capable of smoothly performing assembly work.SOLUTION: A tray 1 includes: a bottom wall 10; an end wall body 11 in which a double wall is constituted by making a pair of first side walls 20, 22 oppose to each other, and which is erected at an end part in a first direction of the bottom wall 10; a folding wall body 12 in which a double wall is constituted by making a pair of folding pieces 30, 32 oppose to each other continuously provided at an end part in a second direction of the pair of first side walls 20, 22, and which is extended along the first direction by being folded with respect to the end wall body 11; and a side wall body 13 in which a double wall is constituted by making a pair of second side walls 40, 42 oppose to each other, and which is erected at an end part in the second direction of the bottom wall 10 in a state where the folding wall body 12 is included. The folding wall body 12 includes a connection part 33 which is laid between the pair of folding pieces 30, 32 and which restricts the pair of folding pieces 30, 32 being deviated in the first direction from each other according to the folding.SELECTED DRAWING: Figure 4

Description

  The present invention relates to trays.

  Patent Document 1 discloses a tray in which an outer plate, a top plate, and an inner plate are continuously provided at both side edges of a bottom plate, and an outer end plate, a top plate, and an inner end plate are continuously provided at both end edges of the bottom plate. Embracing pieces are continuously provided on both side edges of the outer plate and the inner plate. A projecting piece is provided on the outer edge of the embracing piece that is continuously provided on the outer plate, and that is inserted into the recessed portion of the embracing piece that is continuously provided on the inner plate. A double wall is formed by the outer plate, the top plate, and the inner plate, and two hugging pieces are bent inward, and the outer end plate, the top plate, and the inner end plate are doubled so as to wrap (wrap) these hugging pieces. The tray is assembled by forming walls. In the assembled state of the tray, the projecting piece projects upward from the through hole opened at the ridge portion of the top plate and the inner end plate. The protruding piece engages with the upper tray when a plurality of trays are stacked.

JP, 11-255238, A

  However, in the above tray, since the hugging piece connected to the outer side plate and the hugging piece connected to the inner side plate are separated, the operator surely grasps the two hugging pieces. Otherwise, it was not possible to keep the two hugging pieces aligned. If the two holding pieces are not aligned, the two holding pieces cannot be wound by the outer end plate, the top plate and the inner end plate, which makes the tray assembling work difficult. In other words, the above-mentioned tray may not be able to smoothly perform the assembly work.

  The present invention, in order to solve the above problems, provides a tray that can be smoothly assembled.

  In order to achieve the above-mentioned object, the tray of the present invention comprises a bottom wall and a pair of first side walls facing each other to form a double wall, and the tray is erected at an end of the bottom wall in the first direction. One wall and a pair of folding pieces connected to the ends of the pair of first side walls in the second direction intersecting in the first direction face each other to form a double wall, and the first wall The folding wall body that is extended along the first direction by being bent against each other and the pair of second side walls face each other to form a double wall, and the folding wall body is enclosed in the bottom wall. A second wall body that is erected at an end in the second direction, and the folding wall body is installed between the pair of folding pieces, and the pair of folding pieces are mutually arranged in association with bending. A connecting portion that restricts displacement in one direction is included.

  In this case, an engagement hole is formed in the bottom wall, and the connecting portion includes a guide convex portion that is provided so as to project upward. In the case of stacking a plurality of trays in the vertical direction, It is preferable that the guide protrusion of the lower tray is inserted into the engagement hole of the upper tray.

  In this case, the connecting portion is formed to be lower than the guide convex portion on the other side of the pair of folding pieces and the guide convex portion formed on one of the pair of folding pieces. It includes an auxiliary convex portion and a connecting main body portion that is connected to the guide convex portion and the auxiliary convex portion via two convex portion folding curves below the upper end of the guide convex portion. It is preferable.

  In this case, the pair of first side walls includes a first outer wall that is connected to an end portion of the bottom wall in the first direction through a first lower folding curve, and a first outer wall of the first outer wall. A first inner side wall that is continuously provided at two ends of the first outer side wall through two first upper folding curves, and the pair of folding pieces are provided at an end of the first outer side wall in the second direction. An outer folding piece continuously provided through an outer folding curve, and an inner folding piece continuously provided at two end portions of the first inner side wall in the second direction through two inner folding curves. , The inner folding curve located on the outer side in the second direction is formed on the same straight line as the outer folding curve, and the folding concave surface portion formed between the two inner folding curves is located on the inner side in the second direction. With the folding of the pair of folding pieces, the inner folding curve is normally folded, and the inner folding curve located outside in the second direction is reversely folded. It is preferable to absorb the 1 direction of displacement.

  According to the present invention, the tray assembling work can be smoothly performed.

It is a perspective view showing a tray concerning one embodiment of the present invention. It is a top view which shows the blank of the tray which concerns on one Embodiment of this invention. It is a top view which expands and shows a part of blank of the tray which concerns on one Embodiment of this invention. It is a tray which concerns on one Embodiment of this invention, Comprising: It is a perspective view which shows the tray in the middle of an assembly. It is a perspective view which shows the process of bending the folding wall body of the tray which concerns on one Embodiment of this invention. It is a perspective view which shows the tray which concerns on the modification of one Embodiment of this invention. It is a top view which shows the blank of the tray which concerns on the modification of one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, "Fr" indicates "front", "Rr" indicates "rear", "L" indicates "left", "R" indicates "right", and "U" indicates " “Up” and “D” indicate “down”. The front-rear direction (second direction) is orthogonal (cross) to the left-right direction (first direction), and the up-down direction is orthogonal (cross) to the front-rear direction and the left-right direction. In the present specification, terms indicating directions and positions are used, but those terms are used for convenience of description and do not limit the technical scope of the present invention.

  The tray 1 will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view showing the tray 1. FIG. 2 is a plan view showing the blank 5 of the tray 1. FIG. 3 is a plan view showing a part of the blank 5 in an enlarged manner.

[Outline of tray]
As shown in FIG. 1, the tray 1 has a pair of end wall bodies 11 and a pair of side wall bodies 13 provided upright on the peripheral edge of a bottom wall 10 (see FIG. 2), and is formed in a substantially rectangular parallelepiped shape as a whole. .. An opening 1 </ b> A for loading and unloading an article (not shown) placed on the bottom wall 10 is opened on the upper end surface of the tray 1. The tray 1 is formed so that a plurality of trays 1 can be stacked one above the other in a state of containing articles.

  The tray 1 is formed by assembling the blank 5 shown in FIG. The blank 5 is formed by punching out a single corrugated cardboard sheet made of paper with a punch or the like. The corrugated cardboard sheet is, for example, a double-sided corrugated cardboard sheet in which a front liner 9B and a back liner 9C (see FIG. 1) are bonded to a corrugated center lining 9A. Note that FIG. 2 shows the front liner 9B side. In this specification, the direction parallel to the central cortex 9A of the corrugated board sheet is referred to as the "step direction", and the direction orthogonal to the step direction is referred to as the "flow direction". In the drawings, "X" indicates "step direction" and "Y" indicates "flow direction". Further, in the present specification, the terms “top (top)”, “bottom (bottom)” and the like refer to the top (top), bottom (bottom) and this in the assembled state (use state) of the tray 1. Refers to a similar concept.

[blank]
As shown in FIG. 2, the blank 5 includes a bottom wall 10, a pair of end wall bodies 11, four folding wall bodies 12, and a pair of side wall bodies 13.

  The bottom wall 10 is formed in a substantially rectangular shape that is long in the step direction (first direction). The pair of end wall bodies 11 as an example of the first side wall are continuously provided at both end portions of the bottom wall 10 in the step direction. The four folding wall bodies 12 are continuously provided at both ends of the pair of end wall bodies 11 in the flow direction (second direction). The pair of side wall bodies 13 as an example of the second side wall are continuously provided at both ends of the bottom wall 10 in the flow direction. The pair of end wall bodies 11 are formed symmetrically in the step direction with the bottom wall 10 interposed therebetween, and the pair of side wall bodies 13 are formed symmetrically in the flow direction with the bottom wall 10 interposed therebetween. The four folding wall bodies 12 are formed symmetrically in the flow direction with the pair of end wall bodies 11 sandwiched therebetween, and are symmetrically formed in the stepwise direction with the pair of side wall bodies 13 sandwiched therebetween. In the following description, one end wall body 11, one folding wall body 12 and one side wall body 13 will be mainly described.

<End wall>
The end wall body 11 is formed in a substantially rectangular shape that is long in the flow direction as a whole. The end wall body 11 includes a first outer side wall 20 (first side wall), a first frame portion 21, and a first inner side wall 22 (first side wall).

(First outer wall)
The first outer wall 20 is connected to the end of the bottom wall 10 in the step direction via a first lower folding curve L1. The first outer wall 20 is formed in a substantially rectangular shape that is long in the flow direction. The dimension (extended dimension) of the first outer wall 20 in the step direction is set to be shorter (for example, about 1/5) than the dimension of the bottom wall 10 in the step direction.

(First frame part)
The first frame portion 21 is arranged between the first outer side wall 20 and the first inner side wall 22, and is provided to the first outer side wall 20 and the first inner side wall 22 via two first upper folding curves L2. It is lined up. The first frame portion 21 is formed in a substantially rectangular shape elongated in the flow direction. To be precise, the first frame portion 21 is formed in a substantially trapezoidal shape in which the width gradually narrows from the first outer wall 20 side toward the tip. Both ends of the first frame portion 21 in the flow direction (second direction) are inclined so as to approach each other from the base end toward the tip. The extension dimension of the first frame portion 21 is set to be slightly larger (longer) than the thickness of the corrugated board sheet.

(First inner wall)
The first inner wall 22 is connected to the tip of the first frame portion 21. That is, the first inner wall 22 is connected to the end of the first outer wall 20 in the step direction via the two first upper folding curves L2. The first inner wall 22 is formed in a substantially rectangular shape that is shorter than the first outer wall 20 in the flow direction. The extension dimension of the first inner wall 22 is set to be substantially the same as (or slightly shorter than) the extension dimension of the first outer wall 20.

  In the present specification, the first outer side wall 20 and the first inner side wall 22 are collectively referred to as “a pair of first side walls 20, 22”.

<Fold wall>
As shown in FIGS. 2 and 3, the folding wall body 12 is formed in a generally rectangular shape that is long in the flow direction as a whole. The folding wall body 12 includes an outer folding piece 30 (folding piece), a folding concave surface portion 31, an inner folding piece 32 (folding piece), and a connecting portion 33.

(Outer folded piece)
The outer folding piece 30 is connected to the end of the first outer wall 20 in the flow direction via an outer folding curve L3. The outer folding piece 30 is formed in a substantially rectangular shape that is long in the flow direction. The dimension (extension dimension) of the outer folding piece 30 in the flow direction is set to be substantially the same as the extension dimension of the entire end wall body 11. A substantially rectangular outer recess 30A is provided on the side wall body 13 side (lower end) of the outer folding piece 30 (see FIG. 3). The outer recess 30A is formed at a position closer to the tip side than the center of the outer folding piece 30 in the flow direction.

(Folded concave part)
The folding concave surface portion 31 is arranged between the first inner side wall 22 and the inner folding piece 32, and is connected to the first inner side wall 22 and the inner folding piece 32 via two inner folding curves L4. .. The folding concave surface portion 31 is formed in a substantially rectangular shape elongated in the step direction. An end side of the folding concave surface portion 31 on the side of the first frame portion 21 is inclined outward (downward) from the first inner side wall 22 toward the tip (inner folding piece 32) (see FIG. 3). The extension dimension of the folding concave surface portion 31 is set to be substantially the same as (or slightly longer than) the extension dimension of the first frame portion 21.

(Inner folded piece)
The inner folding piece 32 is continuously provided at the tip of the folding concave surface portion 31. That is, the inner folding piece 32 is continuously provided at the end of the first inner side wall 22 in the flow direction via the two inner folding curves L4. Here, the inner folding curve L4 located on the outer side in the flow direction is formed on the same straight line as the outer folding curve L3. In the following description, "(A)" is added to the reference sign of the inner folding curve L4 located outside in the flow direction, and "(B)" is added to the reference sign of the inner folding curve L4 located inside in the flow direction. In addition, in the description common to the two inner folding curves L4, parenthesized alphabets are not added.

  As shown in FIG. 3, a gap G having substantially the same width as the first frame portion 21 is formed between the inner folding piece 32 and the outer folding piece 30. The inner folding piece 32 is formed in a substantially rectangular shape that is symmetrical with the outer folding piece 30 in the step direction with a gap G interposed therebetween. A substantially rectangular inner recess 32A is provided on the outer side of the inner folding piece 32 in the step direction. The inner concave portion 32A is formed at a position symmetrical to the outer concave portion 30A in the step direction with the gap G interposed therebetween.

  In the present specification, the outer folding piece 30 and the inner folding piece 32 are collectively referred to as “a pair of folding pieces 30, 32”.

(Connecting part)
As shown in FIG. 3, the connecting portion 33 is provided between the pair of folding pieces 30 and 32. The connecting portion 33 is arranged in a row in the step direction along with the outer recess portion 30A and the inner recess portion 32A. The connecting portion 33 includes a guide convex portion 34, an auxiliary convex portion 35, and a connecting main body portion 36.

((Guide convex part))
The guide convex portion 34 is formed on the outer folding piece 30 (one of the pair of folding pieces 30 and 32). The guide protrusion 34 is formed in a substantially rectangular shape, and is arranged on the opposite side of the outer recess 30 </ b> A in the step direction with the outer folding piece 30 interposed therebetween. The guide protrusion 34 is provided so as to protrude from the stepwise outer end of the outer folding piece 30 toward the gap G. As will be described later in detail, the guide protrusion 34 is provided so as to project upward in the assembled state of the tray 1.

((Auxiliary convex part))
The auxiliary convex portion 35 is formed on the inner folding piece 32 (the other one of the pair of folding pieces 30 and 32). The auxiliary convex portion 35 is formed in a substantially rectangular shape smaller than the guide convex portion 34. The auxiliary convex portion 35 is arranged on the opposite side of the inner concave portion 32A in the step direction with the inner folding piece 32 interposed therebetween. The auxiliary protrusion 35 is provided so as to protrude from the inner end of the inner folding piece 32 in the step direction toward the gap G. The tip portion of the guide convex portion 34 described above slightly bites into the auxiliary convex portion 35. The protrusion amount of the auxiliary protrusion 35 is smaller than the protrusion amount of the guide protrusion 34. Therefore, the auxiliary convex portion 35 is formed to be lower than the guide convex portion 34 in the assembled state of the tray 1.

((Connecting body))
The connection main body portion 36 is arranged so as to be sandwiched between the guide convex portion 34 and the auxiliary convex portion 35 at the central portion in the flow direction such as the guide convex portion 34. The connection body portion 36 is formed in a substantially rectangular shape smaller than the auxiliary convex portion 35. The connection body portion 36 is connected to the guide convex portion 34 and the auxiliary convex portion 35 via two convex portion bending curves L5. The connection main body 36 is provided so as to project from the tip of the auxiliary convex portion 35 into the guide convex portion 34. For this reason, in the assembled state of the tray 1, the connection body portion 36 is continuously provided below the upper end of the guide protrusion 34.

<Side wall body>
As shown in FIG. 2, the side wall body 13 is formed in a generally rectangular shape that is long in the step direction as a whole. The side wall body 13 includes a second outer side wall 40 (second side wall), a second frame portion 41, and a second inner side wall 42 (second side wall).

(Second outer wall)
The second outer wall 40 is continuously provided at the end of the bottom wall 10 in the flow direction via a second lower folding curve L6. The second outer side wall 40 is formed in a substantially rectangular shape that is long in the step direction. The dimension (extension dimension) of the second outer wall 40 in the flow direction is set to be substantially the same as the extension dimension of the first outer wall 20. In addition, two engagement holes 23 are formed in the bottom wall 10 and the second outer wall 40 so as to straddle the second lower folding curve L6. The engagement hole 23 is a hole formed in a substantially rectangular shape. Although details will be described later, when a plurality of trays 1 are stacked in the vertical direction, the guide protrusions 34 and the like of the lower tray 1 are inserted into the engagement holes 23 of the upper tray 1.

(Second frame part)
The second frame portion 41 is disposed between the second outer side wall 40 and the second inner side wall 42, and is provided to the second outer side wall 40 and the second inner side wall 42 via two second upper folding curves L7. It is lined up. The second frame portion 41 is formed in a substantially rectangular shape elongated in the step direction. To be precise, the second frame portion 41 is formed in a substantially trapezoidal shape in which the width gradually narrows from the second outer wall 40 side toward the tip. Both end sides of the second frame portion 41 in the step direction are inclined so as to approach each other from the base end toward the tip. The extension dimension of the second frame portion 41 is set to be slightly larger (longer) than the thickness of the corrugated board sheet.

  Two outer convex portions 43 are formed in the second frame portion 41 by cutting a part thereof. The outer convex portion 43 is formed at a position aligned with the engaging hole 23 in the flow direction. The outer convex portion 43 is formed so as to project from the second outer wall 40 toward the tip. The outer convex portion 43 is formed in a substantially rectangular shape having substantially the same size as the guide convex portion 34.

(Second inner wall)
The second inner wall 42 is connected to the tip of the second frame 41. That is, the second inner side wall 42 is continuously provided at the end of the second outer side wall 40 in the flow direction via the two second upper folding curves L7. The second inner wall 42 is formed in a substantially rectangular shape that is shorter than the second outer wall 40 in the step direction. The extension dimension of the second inner wall 42 is set to be substantially the same as (or slightly shorter than) the extension dimension of the second outer wall 40. The second inner wall 42 is formed with auxiliary folding curves L8 that are inclined from both ends of the second upper folding curve L7 on the outer side in the flow direction so as to approach each other toward the outer side in the flow direction.

  In the present specification, the second outer side wall 40 and the second inner side wall 42 are collectively referred to as “a pair of second side walls 40, 42”.

  The first lower folding curve L1, the first upper folding curve L2, the outer folding curve L3, the convex folding curve L5, and the second lower folding curve L6 are straight lines in the thickness direction of the corrugated board sheet from the back liner 9C side. It is a general ruled line that is crushed into a shape. The general-purpose ruled line has a function of bending (correctly folding) the corrugated cardboard sheet so that the back liner 9C faces inward. The inner folding curve L4, the second upper folding curve L7, and the auxiliary folding curve L8 are lead ruled lines in which a plurality of cuts are formed at predetermined intervals on the general ruled line. The lead ruled line has a function of normally folding or folding (reverse folding) the corrugated cardboard sheet so that the front liner 9B faces inward. The folding lines L1 to L9 described above are not limited to general ruled lines and lead ruled lines, but may be any lines as long as they are lines for bending a corrugated board sheet.

[Tray assembly]
Next, the assembling work of the tray 1 will be described with reference to FIGS. FIG. 4 is a perspective view showing the tray 1 being assembled. FIG. 5 is a perspective view showing a process of bending the folding wall body 12. In addition, here, as an example, a case where an operator assembles the tray 1 will be described. Further, in order to simplify the description, the description will be given mainly focusing on one end wall body 11, one side wall body 13, and one folding wall body 12.

  The tray 1 is assembled by appropriately bending the blank 5 with the back liner 9C facing upward.

  As shown in FIG. 4, the worker bends the first outer wall 20 along the first lower folding curve L <b> 1 and raises the first outer wall 20 with respect to the bottom wall 10. Further, the worker bends the first frame portion 21 inward along the first upper folding curve L2 and bends the first inner side wall 22 downward along the first upper folding curve L2. In this state, the end wall body 11 is erected on the end portion of the bottom wall 10 in the left-right direction (first direction). Further, the end wall body 11 constitutes a double wall by facing the pair of first side walls 20 and 22. The first frame portion 21 is arranged in a substantially horizontal (substantially parallel to the bottom wall 10) posture.

  Further, as shown in FIG. 4 and FIG. 5, since the folding pieces 30, 32, etc. are continuously provided on the side walls 20, 22, the pair of first side walls 20, 22 are folded back, and at the same time the outer folding is performed. The piece 30 (guide convex portion 34) and the inner folding piece 32 (auxiliary convex portion 35) are folded back along the two convex portion folding curves L5 to form the folding wall body 12. The folding wall body 12 forms a double wall by facing a pair of folding pieces 30 and 32. Further, by folding back the folding pieces 30 and 32, the guide convex portion 34 and the auxiliary convex portion 35 project above the upper end portion of the folding wall body 12 (the folding pieces 30 and 32). Further, since the connecting main body portion 36 is provided so as to bite into the guide convex portion 34, the guide convex portion 34 projects above the connecting main body portion 36 (the upper end portion of the auxiliary convex portion 35). The outer recess 30A and the inner recess 32A substantially coincide with each other to form one recess.

  Subsequently, as shown in FIG. 4, the operator bends the folding wall body 12 inward along the outer and inner folding curves L3 and L4, and the folding wall body 12 is bent to the second lower folding curve L6 (left-right direction). Extend along. In this state, the outer concave portion 30A and the inner concave portion 32A are arranged on the engaging hole 23.

  By the way, when the folding wall body 12 having the double-wall structure is bent, the contour of the bent portion is shorter on the inner side than on the outer side. If the outer folding piece 30 and the inner folding piece 32 are not connected by the connecting portion 33 and the folding wall body 12 having a double-wall structure is bent, the inner folding piece 32 is moved by the difference in the contour. The distal end portion of the inner folding piece 32 projects from the distal end portion of the outer folding piece 30. That is, the outer folding piece 30 and the inner folding piece 32 are displaced in the left-right direction. In this respect, in the tray 1 according to the present embodiment, the connecting portion 33 connects the outer folding piece 30 and the inner folding piece 32, so that the pair of folding pieces 30, 32 are displaced from each other in the left-right direction due to the bending. Regulate things.

  More specifically, as shown in FIG. 5, when the outer folding piece 30 starts to bend along the outer folding curve L3, the inner folding piece 32 starts to bend along the inner folding curve L4 (A) or the like. At this time, a force (see an arrow indicated by a chain double-dashed line in FIG. 5) that pushes the inner folding piece 32 away from the end wall body 11 acts, but the inner folding piece 32 is externally folded via the connecting portion 33. Since it is connected to the piece 30, it cannot move (shift). By restricting the displacement of the inner folding piece 32, a force for pushing toward the end wall body 11 acts on the inner folding piece 32 as a reaction of the pushing force described above (see an arrow shown by a solid line in FIG. 5). Then, the folding concave surface portion 31 formed between the two inner fold curves L4 is normally folded (mountain fold) at the inner fold curve L4 (B) and reversely folded (valley) at the inner fold curve L4 (A). Will be folded). As described above, the folding concave surface portion 31 absorbs a shift in the left-right direction (flow direction) due to the bending of the pair of folding pieces 30 and 32 by bending so as to be inclined. That is, the folding concave surface portion 31 is recessed outward so as to absorb the above-described difference in contour. In this state, the inner folding curve L4 (A) substantially overlaps the outer folding curve L3.

  As described above, the outer folding piece 30 and the inner folding piece 32 are bent in a state in which they are connected to each other and are stacked with their tips aligned.

  Next, as shown in FIG. 1, the worker bends the second outer side wall 40 along the second lower folding curve L6 and raises the second outer side wall 40 with respect to the bottom wall 10. Further, the worker bends the second frame portion 41 inward (toward the bottom wall 10) along the second upper folding curve L7, and bends the second inner side wall 42 downward along the second upper folding curve L7. In this state, the side wall body 13 is erected at the end portion of the bottom wall 10 in the front-rear direction with the folded wall body 12 included therein. Further, the side wall body 13 has a double structure in which a pair of second side walls 40 and 42 are opposed to each other.

  The second frame portion 41 is arranged in a substantially horizontal posture (substantially parallel to the bottom wall 10). Further, by folding back the pair of second side walls 40 and 42, the outer convex portion 43 is raised from the second frame portion 41 and protrudes upward, and the through hole 44 is opened in the second frame portion 41. The guide convex portion 34 of the folding wall body 12 overlaps the inner surface of the outer convex portion 43 and projects upward from the through hole 44. The auxiliary convex portion 35 does not protrude from the through hole 44, and the connection body portion 36 slightly protrudes from the through hole 44.

  Further, since the left and right ends of the second inner side wall 42 are bent while the left and right ends thereof are in contact with the pair of first inner side walls 22, the left and right sides of the second inner side wall 42 are reversely folded along the auxiliary folding curve L8. Accordingly, the second inner side wall 42 can be fitted between the pair of first inner side walls 22 without a gap, and the side wall body 13 can maintain the state in which the folding wall body 12 is included.

  As described above, the tray 1 having the opening 1A on the upper end surface is assembled (see FIG. 1). The worker places the article on the pair of laminated floor portions 33 of the assembled tray 1.

[Stack of trays]
Next, the stacking action of the tray 1 will be briefly described. For example, the user places the upper tray 1 and the lower tray 1 in the same direction, and places the upper tray 1 on the first and second frame portions 21 and 41 of the lower tray 1. Then, the guide protrusion 34 and the outer protrusion 43 of the lower tray 1 are inserted into the engagement holes 23 (recesses 30A and 32A) opened in the bottom wall 10 of the upper tray 1 and the like. As a result, the upper tray 1 and the lower tray 1 are stacked in a state in which a lateral shift is prevented.

  In the tray 1 according to the present embodiment described above, the pair of folding pieces 30 and 32 are connected via the connecting portion 33. According to this configuration, the pair of folding pieces 30 and 32 can form a double wall in a state where the tips are aligned (not displaced) without shifting in the first direction. Thereby, the aligned pair of folding pieces 30 and 32 can be wrapped (rolled) by the side wall body 13, and the assembling work of the tray 1 can be smoothly performed.

  Further, in the tray 1 according to the present embodiment, the connecting portion 33 is configured to include the guide convex portion 34 for preventing lateral displacement when the trays 1 are stacked. According to this structure, the function of connecting the pair of folding pieces 30 and 32 and the function of preventing lateral displacement when the trays 1 are stacked can be integrated in the connecting portion 33. As a result, the structure of the blank 5 can be simplified and the manufacturing cost can be reduced as compared with the case where the guide protrusion 34 is provided separately from the connecting portion 33.

  Further, according to the tray 1 according to the present embodiment, the pair of folding pieces 30, 32 (the guide convex portion 34, the auxiliary convex portion 35) are folded back along the two convex portion folding curves L5, and thus aligned. A double wall can be constructed. Thereby, the folding wall body 12 can be easily wound by the side wall body 13.

  Further, in the tray 1 according to the present embodiment, when the folding wall body 12 is bent along the folding curves L3 and L4, the folding concave surface portion 31 is recessed toward the outside of the corner portion of the tray 1. With this configuration, it is possible to prevent the folding concave surface portion 31 from projecting to the inside of the tray 1, and it is possible to secure the inner space of the tray 1 as wide as possible.

  In addition, in the tray 1 according to the present embodiment, the side wall body 13 is formed in a substantially rectangular shape, but the present invention is not limited to this. For example, as shown in FIGS. 6 and 7, as the tray 2 (blank 6) according to the modified example, a concave side surface opening 50 may be formed in the lateral center region of the side wall body 13. The blank 6 has a side surface opening 50 formed over the second outer side wall 40, the second frame portion 41, and the second inner side wall 42. By forming the side opening 50 in the side wall body 13 in this manner, the article inside the tray 2 can be exposed. Further, a pressing piece 51 is continuously provided on the second outer wall 40 via two pressing folding curves L9 (lead ruled lines). The pressing piece 51 extends from the second outer wall 40 toward the side surface opening 50. After the pair of second side walls 40 and 42 are folded back to form a double wall, the pair of second side walls 40 and 42 are folded back inside so as to overlap the second inner side wall 42. The projection 42A formed at the tip of the second inner wall 42 and the pressing projection 51A formed at the tip of the pressing piece 51 engage with the pressing hole 10A formed in the bottom wall 10. Furthermore, the left and right corners of the second inner side wall 42 are largely carved by a pair of notches 52. As a result, the dimension in the front-rear direction near the corner of the tray 2 can be increased as compared with the case where the notch 52 is not provided.

  In the tray 1 according to the present embodiment (including modified examples, the same applies hereinafter), the connecting portion 33 has a shape that connects a part of the pair of folding pieces 30 and 32, but the present invention is not limited to this. Not limited to. The connecting portion 33 may have a shape that connects the pair of folding pieces 30 and 32 in the entire flow direction (not shown). In other words, the connecting portion 33 may be formed so as to fill the entire gap G between the pair of folding pieces 30 and 32.

  Further, in the tray 1 according to the present embodiment, the guide convex portion 34 is continuously provided on the outer folding piece 30 and the auxiliary convex portion 35 is continuously provided on the inner folding piece 32, but the present invention is not limited to this. 34 may be continuously provided to the inner folding piece 32, and the auxiliary convex portion 35 may be continuously provided to the outer folding piece 30 (not shown). Further, the guide convex portion 34 and the auxiliary convex portion 35 are continuously provided via the two convex portion bending curves L5 (the connecting main body portion 36), but the present invention is not limited to this. For example, the connecting main body portion 36 may be omitted, and the guide convex portion 34 and the auxiliary convex portion 35 may be continuously provided via one convex portion folding curve L5 (not shown).

  Further, in the tray 1 according to the present embodiment, the guide convex portion 34 projects above the auxiliary convex portion 35, but the present invention is not limited to this, and the guide convex portion 34 and the auxiliary convex portion 35 are formed at the same height. May be done. In this case, the connecting main body portion 36 may be omitted, and the guide convex portion 34 and the auxiliary convex portion 35 may be continuously provided via one or more convex portion folding curves L5 (not shown).

  Further, in the tray 1 according to the present embodiment, the connecting portion 33 includes the guide convex portion 34 that engages with the engagement hole 23 when the trays 1 are stacked, but the present invention is not limited to this, and the guide portion is provided from the connecting portion 33. The convex portion 34 may be deleted (not shown). That is, the function of preventing the lateral shift from stacking the trays 1 from the connecting portion 33 may be deleted.

  Further, although the tray 1 according to the present embodiment is formed of a cardboard sheet made of paper, the tray 1 is not limited to this, and may be formed of a cardboard, a resin plate (sheet), or the like.

  In addition, the description of the above embodiment shows one aspect of the tray according to the present invention, and the technical scope of the present invention is not limited to the above embodiment.

1, 2 trays 10 bottom wall 11 end wall body (first wall body)
12 Folded wall body 13 Side wall body (second wall body)
20 First outer wall (first side wall)
22 First Inner Side Wall (First Side Wall)
23 Engagement hole 30 External folding piece (folding piece)
31 Folding concave surface portion 32 Inner folding piece (folding piece)
33 connecting part 34 guide convex part 35 auxiliary convex part 36 connecting body part 40 second outer wall (second side wall)
42 Second Inner Side Wall (Second Side Wall)
L1 1st lower curve L2 1st upper curve L3 Outer curve L4 Inner curve L5 Convex curve

Claims (4)

A bottom wall (10),
A pair of first side walls (20, 22) facing each other to form a double wall, and a first wall body (11) standingly provided at an end of the bottom wall in the first direction;
A pair of folding pieces (30, 32) continuously provided at ends of the pair of first side walls in the second direction intersecting with the first direction are opposed to each other to form a double wall, and the first wall body is provided with the double wall. A folding wall body (12) extending along the first direction by being bent against each other;
A pair of second side walls (40, 42) are opposed to each other to form a double wall, and the second wall body is erected at the end of the bottom wall in the second direction with the folded wall body included. 13) and
The folding wall body includes a connecting portion (33) which is provided between the pair of folding pieces and restricts the pair of folding pieces from being displaced from each other in the first direction due to bending. Characteristic tray. Engagement holes (23) are formed in the bottom wall,
The connecting portion includes a guide protrusion (34) protruding upward.
The tray according to claim 1, wherein, when stacking a plurality of trays in the vertical direction, the guide protrusion of the lower tray is inserted into the engagement hole of the upper tray. The connecting portion is
The guide convex portion formed on any one of the pair of folding pieces,
An auxiliary convex portion (35) formed lower than the guide convex portion on the other side of the pair of folding pieces;
A connecting main body part (36) continuous with the guide convex part and the auxiliary convex part via two convex part folding curves (L5) below the upper end of the guide convex part. The tray according to claim 2, wherein the tray is provided. The pair of first side walls is
A first outer wall (20) continuously connected to an end portion of the bottom wall in the first direction via a first lower folding curve (L1);
A first inner side wall (22) continuously connected to an end portion of the first outer side wall in the first direction via two first upper side bending lines (L2),
The pair of folding pieces,
An outer folding piece (30) continuously connected to an end portion in the second direction of the first outer wall via an outer folding curve (L3);
An inner folding piece (32) continuously connected to the end portion of the first inner side wall in the second direction via two inner folding curves (L4),
The inner fold curve located outside in the second direction is formed on the same straight line as the outer fold curve,
The folding concave surface portion (31) formed between the two inner fold curves is normally folded at the inner fold curve located inside the second direction and at the inner fold curve located outside in the second direction. The tray according to any one of claims 1 to 3, wherein the tray is reversely folded to absorb a shift in the first direction due to bending of the pair of folding pieces.

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