Packing box

Abstract

To provide a packaging box that facilitates the storage of goods, increases the height of the storage space for the goods, and can maintain the state in which the goods are stored. [Solution] The packaging box 1 comprises a pair of side walls 11F, 11R erected at both the front and rear ends of the bottom wall 10, a first top wall 12 extending rearward from the upper end of the side wall 11F, a second top wall 13 extending forward from the upper end of the side wall 11R, a pair of bottom inclined walls 14 extending diagonally upward outward from both the left and right ends of the bottom wall 10, a pair of top inclined walls 15 extending diagonally upward inward from the tips of the pair of bottom inclined walls 14, a pair of first inclined pieces laminated on the back surface of the pair of top inclined walls 15, and a pair of second inclined pieces 17 extending diagonally downward outward from both the left and right ends of the second top wall 13 and laminated on the surface of the pair of top inclined walls 15, wherein the top inclined wall 15 overlaps with at least one of the first inclined pieces and the second inclined pieces 17 at any position in the entire front-to-back direction.

Description

Technical Field

[0001] The present invention relates to a packaging box.

Background Art

[0002] There is known a packaging box provided with a lid for closing an opening of a box body (Patent Document 1). The box body includes a front wall erected at the front end of the bottom wall, a rear wall erected at the rear end of the bottom wall, a pair of lower side walls extending obliquely upward from both left and right ends of the bottom wall toward the outside, a pair of upper side walls extending obliquely upward from the tips of the pair of lower side walls toward the inside, and a pair of side flaps extending from the tips of the pair of upper side walls so as to approach each other. In this packaging box, a front flap connected to the upper end of the front wall is bent backward, and a pair of side flaps are overlapped and temporarily fixed on the front flap, and an article is placed on the bottom wall through an opening formed between the pair of side flaps. Then, a lid connected to the upper end of the rear wall is bent forward to cover the front flap and the pair of side flaps.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the above-described packaging box, since a pair of side flaps extend from a pair of upper side walls so as to approach each other, there is a problem that the opening is narrow and it is difficult to accommodate an article. There is also a problem that the thickness (height) of an article that can be accommodated is limited by the distance (height) between the bottom wall and the side flaps. If a pair of side flaps are omitted, the above problems can be solved, but there may be a gap between the left and right ends of the lid and a pair of upper side walls. Then, it causes another problem different from the above problems, such as the article accommodated in the packaging box jumping out.

[0005] In consideration of the above circumstances, the present invention provides a packaging box that facilitates the storage of articles, increases the height of the storage space for articles, and maintains the state in which articles are stored. [Means for solving the problem]

[0006] The present invention relates to a packaging box for packaging articles, comprising: a bottom wall; a pair of side walls erected at both ends of the bottom wall in a first direction; a first top wall extending from the upper end of one of the side walls toward the other side wall and facing the bottom wall with a storage space for accommodating the articles in between; a second top wall extending from the upper end of the other side wall toward the one side wall and positioned to cover part or all of the first top wall; a pair of bottom inclined walls extending diagonally upward outward from both ends of the bottom wall in a second direction perpendicular to the first direction; and extending diagonally upward inward from both ends of the pair of bottom inclined walls in the second direction. The structure comprises a pair of top inclined walls that are inclined in the opposite direction to the pair of bottom inclined walls and face the pair of bottom inclined walls across a lateral space; a pair of first inclined pieces that extend diagonally downward outward from both ends of the first top wall in the second direction and are laminated on the back or surface of the pair of top inclined walls; and a pair of second inclined pieces that extend diagonally downward outward from both ends of the second top wall in the second direction and are laminated on the surface of the pair of top inclined walls, wherein the top inclined walls overlap at least one of the first inclined pieces and the second inclined pieces at any position within the entire area of ​​the first direction.

[0007] In this case, the structure further comprises: a pair of first inclined corner walls connecting the bottom inclined wall and the first inclined piece, formed in a pair of triangular shapes projecting outward from both ends of one of the side walls in the second direction, and provided in a position inclined toward one side in the first direction as they move away from each other in the second direction; and a pair of second inclined corner walls connecting the bottom inclined wall and the second inclined piece, formed in a pair of triangular shapes projecting outward from both ends of the other side wall in the second direction, and provided in a position inclined toward the other side in the first direction as they move away from each other in the second direction, wherein the bottom inclined wall is formed in a trapezoidal shape between the first inclined corner walls and the second inclined corner walls, and the top inclined wall is formed in a trapezoidal shape that is symmetrical with respect to the bottom inclined wall with respect to the boundary with the bottom inclined wall as the center line.

[0008] In this case, the top inclined wall is laminated on the surface of the first inclined piece, a pair of engagement holes are opened on both sides of the first top wall in the second direction, and the top inclined wall may be provided with a series of engagement pieces that are inserted into the engagement holes.

[0009] In this case, the first inclined piece and the second inclined piece are laminated on the surface of the top inclined wall, the top inclined wall has an engagement hole, and at least one of the first inclined piece and the second inclined piece may be partitioned by a recess cut from the free end in the second direction into which the engagement piece inserted into the engagement hole is located. [Effects of the Invention]

[0010] According to the present invention, it is possible to make it easier to store articles in a packaging box and to increase the height of the storage space for articles. Furthermore, it is possible to maintain the state in which articles are stored in the packaging box. [Brief explanation of the drawing]

[0011] [Figure 1] This is a perspective view showing a packaging box according to the first embodiment of the present invention. [Figure 2] This is a plan view showing a blank packaging box according to the first embodiment of the present invention. [Figure 3]This is a perspective view of a packaging box according to the first embodiment of the present invention, showing the front side wall in an upright position and the first top wall facing the bottom wall. [Figure 4] This is a perspective view of a packaging box according to a first embodiment of the present invention, showing the top inclined wall laminated onto a first inclined piece. [Figure 5] This is a perspective view showing a packaging box according to the first embodiment of the present invention, illustrating the process of raising the rear side wall and closing the opening with the second top wall. [Figure 6A] This is a cross-sectional view AA in Figure 1. [Figure 6B] This is a cross-sectional view of BB in Figure 1. [Figure 7] This is a plan view showing a blank packaging box according to a second embodiment of the present invention. [Figure 8] This is a perspective view showing the process of assembling a packaging box according to a second embodiment of the present invention. [Figure 9] This is a perspective view showing a packaging box according to a second embodiment of the present invention. [Figure 10] This is a plan view showing a blank packaging box according to a modified example of the second embodiment of the present invention. [Modes for carrying out the invention]

[0012] Embodiments of the present invention will be described below with reference to the attached drawings. In the drawings, Fr, Rr, L, R, U, and D indicate front, back, left, right, top, and bottom. The front-to-back, left-to-right, and up-to-down directions are orthogonal to each other. While this specification uses terms to indicate direction and position, these terms are used for convenience of explanation and do not limit the technical scope of the present invention. Furthermore, the terms indicating direction and position are based on the direction and position of the packaging box in its assembled state.

[0013] [First Embodiment] The packaging box 1 according to the first embodiment will be described with reference to Figures 1 and 2. Figure 1 is a perspective view showing the packaging box 1. Figure 2 is a plan view showing the blank 1A of the packaging box 1.

[0014] As shown in Fig. 1, the packaging box 1 is set such that the dimension in the vertical direction (thickness direction, height direction) is smaller (shorter) than the dimensions in the front-rear direction (first direction) and the left-right direction (second direction), and is generally formed in a thick plate shape. The packaging box 1 is, for example, a so-called post-in-box formed so that an article (not shown) can be inserted into a mailbox in a packaged state. Note that the height of the packaging box 1 is preferably 30 mm or less so that it can be inserted into a general mailbox, but the technical scope of the present invention does not exclude a packaging box 1 having a height exceeding 30 mm.

[0015] The packaging box 1 is formed by assembling the blank 1A shown in Fig. 2. The blank 1A is formed by punching out a single paper cardboard sheet using a die or the like. The cardboard sheet is, for example, a double-sided cardboard sheet in which a corrugated middle liner 9A is bonded to a front liner 9B and a back liner 9C (see also Fig. 3). Note that Fig. 2 shows the front liner 9B side (the surface of the packaging box 1). In this specification, the direction parallel to the middle liner 9A of the cardboard sheet is referred to as the "step direction", and the direction orthogonal to the step direction is referred to as the "flow direction". "X" shown in the drawings indicates the "step direction", and "Y" indicates the "flow direction".

[0016] [Blank] As shown in Fig. 2, the blank 1A forming the packaging box 1 includes a bottom wall 10, a pair of side walls 11F, 11R, a first top wall 12, a second top wall 13, a pair of bottom surface inclined walls 14, a pair of top surface inclined walls 15, a pair of first inclined pieces 16, a pair of second inclined pieces 17, a pair of first inclined corner walls 18, and a pair of second inclined corner walls 19. In Fig. 2, since the pair of bottom surface inclined walls 14, the pair of top surface inclined walls 15, the pair of first inclined pieces 16, the pair of second inclined pieces 17, the pair of first inclined corner walls 18, and the pair of second inclined corner walls 19 are each symmetric in shape, in this specification, the description will mainly focus on one part.

[0017] <Bottom wall, side wall> The bottom wall 10 is formed in a rectangular shape that is elongated in the flow direction. A pair of side walls 11F and 11R are connected to both ends of the bottom wall 10 in the step direction (front-to-back direction) via a first bend curve L1. Each of the side walls 11F and 11R is formed in a rectangular shape with the same width as the bottom wall 10 in the flow direction. The step-direction dimension (height) of each of the side walls 11F and 11R is set to 30 mm or less so that mail can be placed in a mailbox.

[0018] <First Heavenly Wall> The first top wall 12 is connected to one end of the side wall 11F in the step direction via a second bend L2. The first top wall 12 is formed in a rectangular shape with the same width in the flow direction as the side wall 11F, and its dimension in the step direction (front-back direction) is set to approximately twice the height of the side wall 11F. A pair of engagement holes 20 are opened on both sides of the first top wall 12 in the flow direction. The pair of engagement holes 20 are drilled along both ends of the first top wall 12 in the flow direction (left-right direction). Each engagement hole 20 is a roughly rectangular opening and is formed closer to the side wall 11F than the center of the first top wall 12 in the step direction.

[0019] A sealing hole 21 is cut into the boundary (second bend curve L2) between the first top wall 12 and the side wall 11F. The sealing hole 21 is a cut line formed in the central region in the flow direction of the second bend curve L2. The central part of the sealing hole 21 in the flow direction is bent so as to be convex toward the side wall 11F, so an opening restriction protrusion 22 is formed in the first top wall 12 so as to bite into the side wall 11F.

[0020] <Second Heavenly Wall> The second top wall 13 is connected to the other (rear) side wall 11R in the step direction via a third bend L3. The second top wall 13 is formed in a rectangular shape with the same width in the flow direction as the side wall 11R, and its dimension in the step direction (front-to-back direction) is set to be approximately the same as the dimension of the bottom wall 10 in the step direction (front-to-back direction). Therefore, the sum of the front-to-back dimensions of the first top wall 12 and the second top wall 13 is set to be longer than the front-to-back dimension of the bottom wall 10.

[0021] A sealing piece 23 is attached to the step-direction tip (free end) of the second top wall 13 via a fourth fold curve L4. The sealing piece 23 is formed in a substantially trapezoidal shape and is connected to the central region of the free end in the flow direction. A substantially rectangular opening restriction hole 24 is drilled in the sealing piece 23 along the fourth fold curve L4. In addition, a pair of opening zippers 25 are formed on the second top wall 13, inclined so as to approach each other from both ends of the fourth fold curve L4 toward the side wall 11R. On the free end side of the second top wall 13, a substantially triangular opening piece 26 is partitioned by the pair of opening zippers 25. In addition, a substantially semicircular finger hole 27 is drilled at the apex of the opening piece 26 (where the pair of opening zippers 25 intersect).

[0022] <Bottom sloping wall, top sloping wall> A pair of bottom inclined walls 14 are connected to both ends of the bottom wall 10 in the flow direction (left-right direction) via a fifth bend curve L5. The bottom inclined walls 14 are formed in a trapezoidal shape, gradually widening in the step direction as they move away from the bottom wall 10 in the flow direction. A pair of top inclined walls 15 are connected to the front ends of the pair of bottom inclined walls 14 in the flow direction via a sixth bend curve L6. The top inclined walls 15 are formed in a trapezoidal shape, gradually narrowing in the step direction as they move away from the bottom inclined walls 14 in the flow direction. In detail, the top inclined walls 15 are formed in a trapezoidal shape that is symmetrical with the bottom inclined walls 14 with respect to the boundary with the bottom inclined walls 14 (sixth bend curve L6) as the center line. The front ends of the fifth bend curve L5 and the top inclined walls 15 in the flow direction are each approximately the same length as the step direction (front-back direction) dimension of the bottom wall 10.

[0023] An engaging piece 28 is connected to the flow-direction tip (free end) of the top inclined wall 15 via an engaging line L11. The engaging piece 28 is formed in a roughly hexagonal shape with a constricted base end in the flow direction and is connected to one side (front) of the free end in the step direction. As will be described in detail later, the engaging piece 28 is inserted into an engaging hole 20 that opens in the first top wall 12.

[0024] <1st inclined piece> A pair of first inclined pieces 16 are connected to both ends of the first top wall 12 in the flow direction (left-right direction) via a seventh bend curve L7. The first inclined pieces 16 are formed in a trapezoidal shape, gradually widening in the step direction as they move away from the first top wall 12 in the flow direction. In detail, one end of the first inclined piece 16 in the step direction is on the same line as the leading edge of the first top wall 12 in the step direction, and the other end of the first inclined piece 16 in the step direction (boundary with the first inclined corner wall 18) is on the same line as one end of the top surface inclined wall 15 in the step direction (the side corresponding to the leg of the trapezoid). The seventh bend curve L7 is approximately the same length as the dimension of the first top wall 12 in the step direction (front-back direction). The engagement hole 20 of the first top wall 12 opens along the seventh bend curve L7 and divides the seventh bend curve L7.

[0025] <Second inclined piece> A pair of second inclined pieces 17 are connected to both ends of the second top wall 13 in the flow direction (left-right direction) via the eighth bend curve L8. The second inclined pieces 17 are generally formed in a shark fin shape. In detail, one end of the second inclined piece 17 in the step direction (the boundary with the second inclined corner wall 19) is on the same straight line as the other end of the top surface inclined wall 15 in the step direction (the side corresponding to the leg of the trapezoid), and the other end of the second inclined piece 17 in the step direction is gently curved. Furthermore, the second inclined piece 17 is formed to be shorter than the second top wall 13 in the step direction (front-back direction). That is, the length of the eighth bend curve L8 is set to be shorter than the dimension of the second top wall 13 in the step direction (front-back direction). Also, the combined length of the seventh bend curve L7 and the eighth bend curve L8 (dimension in the front-back direction) is set to be longer than the dimension of the bottom wall 10 in the front-back direction.

[0026] <1st slope wall> The first inclined corner wall 18 is interposed in the area enclosed by the side wall 11F, the bottom inclined wall 14, and the first inclined piece 16. The pair of first inclined corner walls 18 are connected to both ends of the side wall 11F in the flow direction (left-right direction) via the ninth bend curve L9. The pair of first inclined corner walls 18 are formed in a pair of triangular shapes (more precisely, isosceles triangles) that project outward from both ends of the side wall 11F in the flow direction. The first inclined corner wall 18 connects the base of the isosceles triangle to the side wall 11F, and the pair of hypotenuses of the isosceles triangle connect to the bottom inclined wall 14 and the first inclined piece 16. In detail, the first inclined corner wall 18 is connected to the bottom inclined wall 14 via the first bottom diagonal line L12 and to the first inclined piece 16 via the first top diagonal line L13.

[0027] <Second slope wall> The second inclined corner wall 19 is interposed in the area enclosed by the side wall 11R, the bottom inclined wall 14, and the second inclined piece 17. The pair of second inclined corner walls 19 are connected to both ends of the side wall 11R in the flow direction (left-right direction) via the tenth bend L10. The pair of second inclined corner walls 19 are formed in a pair of triangular shapes (more precisely, isosceles triangles) that project outward from both ends of the side wall 11R in the flow direction. The second inclined corner wall 19 connects the base of the isosceles triangle to the side wall 11R, and the pair of hypotenuses of the isosceles triangle connect to the bottom inclined wall 14 and the second inclined piece 17. In detail, the second inclined corner wall 19 is connected to the bottom inclined wall 14 via the second bottom diagonal L14 and to the second inclined piece 17 via the second top diagonal L15.

[0028] Here, the first top wall 12, side wall 11F, bottom wall 10, side wall 11R, and second top wall 13 are arranged in a line in this order from one side to the other in the step direction. Also, the first inclined piece 16, first inclined corner wall 18, bottom inclined wall 14, second inclined corner wall 19, and second inclined piece 17 are arranged in a line in this order from one side to the other in the step direction. The bottom inclined wall 14 is formed in a trapezoidal shape between the first inclined corner wall 18 and the second inclined corner wall 19. In addition, the fifth bent curve L5 and the seventh to tenth bent curves L7 to L10 are arranged in a straight line in the step direction.

[0029] The first to fourth fold lines L1 to L4, the first to second bottom diagonal lines L12 and L14, and the first to second top diagonal lines L13 and L15 are general-purpose creases formed by crushing the corrugated cardboard sheet in the thickness direction from the back liner 9C side. The fifth to tenth fold lines L5 to L10 and the engagement fold line L11 are lead lines formed by creating perforations on the general-purpose creases. The lead lines and general-purpose creases primarily serve to fold the corrugated cardboard sheet so that the back liner 9C faces inward. The numerous lines described above are not limited to general-purpose creases or lead lines; any structure for folding the corrugated cardboard sheet, such as perforations, may be used.

[0030] Furthermore, in the packaging box 1 according to the first embodiment, the 5th to 8th fold curves L5 to L8 are formed to have different foldability. Since the 5th to 8th fold curves L5 to L8 are lead lines, the foldability can be changed by the length of the perforations and the spacing between adjacent perforations (seam length). Specifically, when the seam length is constant, the corrugated cardboard sheet becomes easier to fold as the perforations are longer and harder to fold as the perforations are shorter. Also, when the perforation length is constant, the corrugated cardboard sheet becomes harder to fold as the seams are longer and easier to fold as the seams are shorter. In the packaging box 1 according to the first embodiment, the corrugated cardboard sheet becomes easier to fold in the order of the 6th fold curve L6, the 7th fold curve L7, the 5th fold curve L5, and the 8th fold curve L8. In other words, the lengths of the perforations and seams of the 5th to 8th fold curves L5 to L8 are set so that the force applied to the corrugated cardboard sheet decreases in the order described above.

[0031] [Assembly instructions for the packaging box] Next, the assembly procedure (sealing procedure) for the packaging box 1 will be described with reference to Figures 1, 3 to 6. Figure 3 is a perspective view showing the front side wall 11F raised and the first top wall 12 facing the bottom wall 10. Figure 4 is a perspective view showing the top inclined wall 15 stacked on the first inclined piece 16. Figure 5 is a perspective view showing the rear side wall 11R raised and the opening 1U closed with the second top wall 13. Figure 6A is a cross-sectional view AA of Figure 1. Figure 6B is a cross-sectional view BB of Figure 1. In this specification, folding the corrugated cardboard sheet so that the back liner 9C (back surface) faces inward is called "forward folding," and folding the corrugated cardboard sheet so that the front liner 9B (front surface) faces inward is called "reverse folding."

[0032] For example, a worker places a blank 1A with the back liner 9C (back side) facing upwards on a workbench, and folds the side wall 11F upwards along the first fold curve L1 and the first top wall 12 backwards along the second fold curve L2, as shown in Figure 3. The side wall 11F is erected at the front end of the bottom wall 10, and the first top wall 12 extends backwards from the upper end of the side wall 11F (towards the other side wall 11R). The first top wall 12 faces the bottom wall 10 with a portion of the storage space S1 for storing articles in between (see Figure 6A). The bottom wall 10 and the first top wall 12 are in a nearly parallel position, and the storage space S1 is a space of approximately constant height.

[0033] As the side wall 11F is bent, the first inclined corner wall 18 is slightly reverse-folded forward along the ninth fold curve L9, while simultaneously being folded upward along the first bottom diagonal line L12. Also, as the side wall 11F is bent, the bottom inclined wall 14, which is connected to the side wall 11F via the first inclined corner wall 18, is automatically slightly folded upward along the fifth fold curve L5. In this state, the pair of bottom inclined walls 14 extend diagonally upward outward from both ends of the bottom wall 10 in the left-right direction, and assume a slightly inclined posture. The pair of first inclined corner walls 18 are erected at the front ends of the pair of bottom inclined walls 14, and as they move away from each other in the left-right direction, they assume a posture that is inclined forward (to one side in the first direction).

[0034] As the first top wall 12 is folded, the first inclined piece 16 is folded slightly downward along the seventh fold line L7 and then folded backward along the first top inclined line L13. In this state, the pair of first inclined pieces 16 extend diagonally downward outward from both ends of the first top wall 12 in the left-right direction. The first inclined pieces 16 are inclined in the opposite direction to the bottom inclined wall 14 and face the bottom inclined wall 14 across the lateral space S2 (see Figure 6A). The bottom inclined wall 14 and the first top wall 12 form a horizontal V shape when viewed from the front (or back), and the lateral space S2 is a space in which the height gradually decreases from the center outward in the left-right direction (see Figure 6A). In principle, no articles are stored in the lateral space S2, but depending on the shape of the article, a part of the article may be placed in the lateral space S2.

[0035] Next, as shown in Figure 4, the worker folds the top inclined wall 15 towards the center in the left-right direction along the sixth fold line L6 (right fold), overlapping the top inclined wall 15 with the surface (surface liner 9B) of the first inclined piece 16, and inserts the engaging piece 28 into the engaging hole 20 of the first top wall 12 while folding it downwards in the right direction along the engaging fold line L11. In this state, the pair of top inclined walls 15 extend diagonally upward inward from both ends in the left-right direction of the pair of bottom inclined walls 14, and are inclined in the opposite direction to the pair of bottom inclined walls 14. The top inclined wall 15 is positioned to cover almost the entire surface of the first inclined piece 16 (see Figure 4), and faces the bottom inclined wall 14 across the lateral space S2 (see Figure 6A). The engaging piece 28 is inserted into the engaging hole 20 so that it cannot be easily pulled out. Therefore, the top inclined wall 15 is held in a state of being laminated on the surface of the first inclined piece 16 without the use of adhesive or adhesive tape. As a result, the side walls 11F and the first inclined corner wall 18 are held in an upright position, and the first top wall 12 is held in a position facing the bottom wall 10 across the storage space S1. The bottom inclined wall 14 and the top inclined wall 15 form a horizontal V shape when viewed from the front (or back) (see Figures 6A and 6B).

[0036] As described above, the front side of the opening 1U formed between the tips of the pair of top inclined walls 15 is closed by the first top wall 12, and the opening 1U behind the first top wall 12 is left open, and the packaging box 1 is temporarily assembled (see Figure 4). The worker then places the goods into the temporarily assembled packaging box 1.

[0037] Next, as shown in Figure 5, the worker folds the side wall 11R upward along the first fold line L1 and the second top wall 13 forward along the third fold line L3. The side wall 11R is erected at the rear end of the bottom wall 10 (see Figure 5), and the second top wall 13 extends forward from the upper end of the side wall 11R (to one of the side walls 11F) (see Figure 1). The worker also inserts the sealing piece 23 into the sealing hole 21 while folding it downward along the fourth fold line L4 (see Figure 1). In this state, the front side (tip side) of the second top wall 13 overlaps the surface of the first top wall 12, and the second top wall 13 is positioned to cover almost the entire surface of the first top wall 12 (see Figures 1 and 6A). The second top wall 13 closes the opening 1U behind the first top wall 12 and faces the bottom wall 10 across the storage space S1 (see Figure 6B). The opening restriction projection 22 of the first top wall 12 fits into the opening restriction hole 24 of the sealing piece 23, restricting the removal of the sealing piece 23 (see Figure 1).

[0038] As the side wall 11R is bent, the second inclined corner wall 19 is slightly reverse-folded backward along the 10th fold curve L10, while simultaneously being folded upward along the second bottom diagonal line L14 (see Figure 5). As the second top wall 13 is bent, the second inclined piece 17 is slightly downward along the 8th fold curve L8, while simultaneously being folded forward along the second top diagonal line L15 (see Figures 1 and 5). In this state, the pair of second inclined corner walls 19 are erected at the rear ends of the pair of bottom inclined walls 14, and as they move away from each other in the left-right direction, they are inclined backward (towards the other side in the first direction). The pair of second inclined pieces 17 extend diagonally downward outward from both ends of the second top wall 13 in the left-right direction (see Figure 1). The second inclined pieces 17 are inclined in the opposite direction to the bottom inclined wall 14 and are stacked on the surface of the top inclined wall 15 (see Figures 6A and 6B).

[0039] As a result, the packaging box 1 is assembled (sealed) (see Figure 1). With the packaging box 1 sealed, the first inclined piece 16 is stacked on the back surface of the top inclined wall 15, and the second inclined piece 17 is stacked on the surface of the top inclined wall 15 (see Figure 6A). The front end of the second inclined piece 17 is located near the rear side of the engaging piece 28 that engages with the engaging hole 20 (see Figure 1), and the area near the front end of the second inclined piece 17 overlaps with the area near the rear end of the first inclined piece 16, with the top inclined wall 15 in between (see Figure 6A). Therefore, near the front end of the second inclined piece 17, the first inclined piece 16, the top inclined wall 15, and the second inclined piece 17 are stacked to form a triple wall (see Figure 6A). Furthermore, behind the tip (rear end) of the first inclined piece 16, the top inclined wall 15 and the second inclined piece 17 are stacked to form a double wall (see Figure 6B). That is, the first inclined piece 16 and the second inclined piece 17 are not adhered to the top inclined wall 15, but are stacked over the entire front-to-back area of ​​the top inclined wall 15. In other words, the top inclined wall 15 overlaps with at least one of the first inclined piece 16 and the second inclined piece 17 at any position in the front-to-back area (first direction). To put it another way, no matter where in the front-to-back area of ​​the packaging box 1 the cross-section is viewed, the top inclined wall 15 forms a double wall with at least one of the first inclined piece 16 and the second inclined piece 17. Also, by inserting the sealing piece 23 into the sealing hole 21, the second top wall 13 (front side) is stacked over the entire area of ​​the first top wall 12 without being adhered to it.

[0040] In the packaging box 1 according to the first embodiment, the second top wall 13 was held in a position that closed the opening 1U by inserting the sealing piece 23 into the sealing hole 21. In addition, the second top wall 13 may be fixed to the side wall 11F with adhesive tape, a shipping label, or the like (neither of which are shown). When opening the sealed packaging box 1, the user places their finger in the finger hole 27 and pulls up the opening piece 26, breaking the pair of opening zippers 25 and separating the opening piece 26 from the second top wall 13 (not shown). This allows the first and second top walls 12 and 13 to be easily opened, and the items contained in the packaging box 1 can be removed.

[0041] According to the packaging box 1 of the first embodiment described above, since there is no flap extending inward from the tip of the top inclined wall 15, the opening 1U (opening dimension in the left-right direction) formed between the tips of the pair of top inclined walls 15 can be made wider compared to when such a flap is present. This makes it easier to store articles through the opening 1U.

[0042] Furthermore, since the packaging box 1 that can be placed in a mailbox is required to be made as thin as a millimeter, it is often difficult to secure the height of the storage space S1 for the goods. Therefore, even if the thickness is only that of a single sheet of corrugated cardboard, it may be required to increase the height of the storage space S1. In response to such requirements, the packaging box 1 according to the first embodiment does not have a flap extending inward from the tip of the top inclined wall 15, so the storage space S1 for the goods can be widened in the height direction by the thickness of one such flap (corrugated cardboard sheet).

[0043] Furthermore, according to the packaging box 1 of the first embodiment, since the first and second inclined pieces 16 and 17 are stacked over the entire front-to-back direction (first direction) of the top inclined wall 15, no gaps are created between the left and right ends of the first and second top walls 12 and 13 and the pair of top inclined walls 15. Also, when the packaging box 1 is sealed, the second inclined piece 17 presses against the top inclined wall 15 from the surface side, so the pair of top inclined walls 15 do not open outwards. As a result, the contents of the packaging box 1 are prevented from falling out and the contents are kept contained. Note that a slight restoring force acts on the second inclined piece 17 around the eighth fold curve L8, so the second inclined piece 17 is not in close contact with the surface of the top inclined wall 15. However, since the tip of the top inclined wall 15 is in close contact with the base end of the second inclined piece 17 (near the eighth bend L8), no gap is created between the second top wall 13 and the top inclined wall 15 (see Figures 6A and 6B).

[0044] Furthermore, in the packaging box 1 according to the first embodiment, the front side wall 11F, the bottom inclined wall 14, and the first inclined piece 16 are connected via a triangular first inclined corner wall 18, and the rear side wall 11R, the bottom inclined wall 14, and the second inclined piece 17 are connected via a triangular second inclined corner wall 19. With this configuration, when assembling the packaging box 1 from a blank 1A, the bottom inclined wall 14 can be tilted in conjunction with raising the side walls 11F, 11R and the first and second inclined corner walls 18, 19. Also, the first and second inclined pieces 16, 17 can be tilted in conjunction with closing the opening 1U with the first and second top walls 12, 13. This allows the bottom inclined wall 14 and the first and second inclined pieces 16 and 17 to be automatically tilted by raising the side walls 11F, 11R, etc., or by closing the opening 1U with the first and second top walls 12 and 13, enabling the packaging box 1 to be assembled easily and quickly. Furthermore, by making the fifth fold curve L5, which is the center for folding the bottom inclined wall 14, and the seventh and eighth fold curves L7 and L8, which are the centers for folding the first and second inclined pieces 16 and 17, easier to fold than the sixth fold curve L6, the phenomenon of the bottom inclined wall 14 and the first and second inclined pieces 16 and 17 tilting automatically can be easily achieved. In particular, since the worker does not directly grasp and fold the bottom inclined wall 14 and the second inclined piece 17, it is effective to make the fifth fold curve L5 and the eighth fold curve L8 easier to fold.

[0045] Furthermore, according to the packaging box 1 of the first embodiment, since the top inclined wall 15 is formed in a trapezoidal shape that is symmetrical to the bottom inclined wall 14, when the opening 1U is closed by the first and second top walls 12 and 13, the tip (free end) of the top inclined wall 15 does not interfere with the back surface of the second top wall 13 (see Figures 6A and 6B). As a result, the opening 1U can be properly closed by the first and second top walls 12 and 13.

[0046] Furthermore, according to the packaging box 1 of the first embodiment, the engaging piece 28 is inserted into the engaging hole 20, temporarily fixing the top inclined wall 15 to the first inclined piece 16, and the packaging box 1 can be temporarily assembled with the rear side of the first top wall 12 open (see Figure 4). As a result, the user does not need to place items in the packaging box 1 while assembling it, and can quickly place items in the temporarily assembled packaging box 1.

[0047] In the packaging box 1 according to the first embodiment, a sealing flap 23 was attached to the tip of the second top wall 13. However, the sealing flap 23 may be omitted. In this case, the opening zipper 25 and finger holes 27 may also be omitted, as may the sealing hole portion 21 formed on the first top wall 12 side.

[0048] Furthermore, in the packaging box 1 according to the first embodiment, the second top wall 13 was formed to be longer in the front-to-back direction than the first top wall 12, but the invention is not limited to this, and the second top wall 13 may be formed to be shorter in the front-to-back direction than the first top wall 12, or to be the same length as the first top wall 12 (neither is shown). Also, in the invention, the second inclined piece 17 was formed to be longer in the front-to-back direction than the first inclined piece 16, but the invention is not limited to this, and the second inclined piece 17 may be formed to be shorter in the front-to-back direction than the first inclined piece 16, or to be the same length as the first inclined piece 16 (neither is shown). However, considering the ease of assembly of the packaging box 1, it is preferable that the second top wall 13 and the second inclined piece 17, which are located at the top layer, be formed to be longer in the front-to-back direction than the first top wall 12 and the first inclined piece 16, and it is preferable that the front-to-back dimensions of the second top wall 13 and the second inclined piece 17 are more than half of the front-to-back dimensions of the entire packaging box 1.

[0049] [Second Embodiment] The packaging box 2 (blank 2A) according to the second embodiment will be described with reference to Figures 7 to 9. Figure 7 is a plan view showing the blank 2A ​​of the packaging box 2. Figure 8 is a perspective view showing the process of assembling the packaging box 2. Figure 9 is a perspective view showing the packaging box 2. In the following description, the same (similar) components as those of the packaging box 1 (blank 1A) according to the first embodiment will be denoted by the same reference numerals, and descriptions similar to those of the packaging box 1 (blank 1A) will be omitted.

[0050] Packaging box 2 is formed by assembling blank 2A ​​(a double-sided corrugated cardboard sheet made of paper). As shown in Figure 7, blank 2A ​​comprises a bottom wall 10, a pair of side walls 11F, 11R, a first top wall 32, a second top wall 33, a pair of bottom inclined walls 14, a pair of top inclined walls 35, a pair of first inclined pieces 36, a pair of second inclined pieces 37, a pair of first inclined corner walls 18, and a pair of second inclined corner walls 19. Note that in Figure 7, the pair of bottom inclined walls 14, the pair of top inclined walls 35, the pair of first inclined pieces 36, the pair of second inclined pieces 37, the pair of first inclined corner walls 18, and the pair of second inclined corner walls 19 are all symmetrical in shape, so in this specification, we will mainly focus on describing one part at a time.

[0051] The first top wall 32 and the second top wall 33 are formed in a roughly rectangular shape of the same size and are connected to the stepped ends of a pair of side walls 11F and 11R via second and third bend curves L2 and L3. The combined front-to-back dimension of the first top wall 32 and the second top wall 33 is set to be longer than the front-to-back dimension of the bottom wall 10.

[0052] The top inclined wall 35 is roughly trapezoidal in shape, which is an inversion of the bottom inclined wall 14 with respect to the sixth bend curve L6. A hooking hole 40 is opened in the central region of the top inclined wall 35 in the step direction. The hooking hole 40 is notched (recessed) from the tip to the base end in the flow direction (left-right direction) of the top inclined wall 35. The hooking hole 40 is formed in a roughly trapezoidal shape that narrows in the step direction from the tip to the base end in the flow direction. Since the hooking hole 40 is formed in the top inclined wall 35, strictly speaking, the top inclined wall 35 is not a trapezoid that is symmetrical with respect to the bottom inclined wall 14 with respect to the sixth bend curve L6 as the center line. However, assuming that the hooking hole 40 does not exist, the general shape of the top inclined wall 35 would be a trapezoid that is symmetrical with respect to the bottom inclined wall 14 with respect to the sixth bend curve L6 as the center line. In other words, the term "line symmetry" in the claims does not mean that the shape must be strictly line symmetrical, but rather that it includes shapes that are generally line symmetrical or that can be considered to be approximately line symmetrical.

[0053] A pair of first inclined pieces 36 are connected to both ends of the first top wall 12 in the flow direction via an eighth fold curve L8. A recess 41 is formed on the tip side of the first inclined piece 36, beyond the center in the step direction. The recess 41 is cut in a roughly triangular shape from the tip to the base end in the flow direction of the first inclined piece 36. In addition, an engagement guide line L16 (e.g., a lead line) is formed on the first inclined piece 36 so as to connect the vicinity of the center in the step direction of the eighth fold curve L8 to the vertex of the triangular recess 41. On the tip side of the first inclined piece 36 in the step direction, an engagement piece 42 is demarcated by the recess 41 and the engagement guide line L16. The engagement piece 42 is a part of the tip side of the first inclined piece 36 in the step direction and is the part that is inserted into the engagement hole 40. Note that in the packaging box 1 according to the first embodiment, the seventh fold curve L7 that forms the boundary between the first top wall 12 and the first inclined piece 16 is omitted in the packaging box 2 according to the second embodiment.

[0054] A pair of second inclined pieces 37 are connected to both ends of the second ceiling wall 13 in the flow direction via an eighth bend L8. The second inclined piece 37 has the shape of the first inclined piece 36 inverted vertically in Figure 7, and like the first inclined piece 36, the second inclined piece 37 has a recess 43, an engagement guide line L17, and an engagement piece 44 formed therein.

[0055] [Assembly instructions for the packaging box] As shown in Figure 8, the worker folds the pair of top inclined walls 35 inward along the sixth fold curve L6, so that the top inclined walls 35 face the bottom inclined wall 14 across the lateral space S2. Next, the worker folds the side wall 11F upward along the first fold curve L1, folds the first top wall 32 backward along the second fold curve L2, and inserts the pair of interlocking pieces 42 into the interlocking holes 40 of the pair of top inclined walls 35 while folding them downward along the eighth fold curve L8. In this state, the side wall 11F and the first inclined corner wall 18 are in an upright position, the first top wall 32 faces the bottom wall 10 across the storage space S1, and the bottom inclined wall 14 is inclined in the opposite direction to the top inclined wall 35. The interlocking pieces 42 are stacked on the back surface of the top inclined wall 35, and the first inclined pieces 36, excluding the interlocking pieces 42, are stacked on the surface of the top inclined wall 35. The edge of the engagement hole 40 of the top inclined wall 35 enters the recess 41 of the first inclined piece 36 and is sandwiched between the first inclined piece 36 and the engagement piece 42, excluding the engagement piece 42. As a result, the first inclined piece 36 is held in a state where it is laminated on the surface of the top inclined wall 35, inclined in the same direction as the top inclined wall 35, without the use of adhesive or the like.

[0056] As a result, a temporary packaging box 2 is assembled with the first top wall 32 closing approximately the front half of the opening 2U formed between the tips of the pair of top inclined walls 35, and leaving approximately the rear half of the opening 2U open (see Figure 8). The worker then places the goods into the temporarily assembled packaging box 2.

[0057] Next, as shown in Figure 9, the worker folds the side wall 11R upward along the first fold curve L1, folds the second top wall 33 forward along the third fold curve L3, and inserts the pair of interlocking pieces 44 into the pair of interlocking holes 40 while folding them downward along the eighth fold curve L8. In this state, the side wall 11R and the second inclined corner wall 19 are in an upright position, the second top wall 33 closes the rear half of the opening 2U and faces the bottom wall 10 across the storage space S1. The front side (tip side) of the second top wall 33 overlaps the rear side (tip side) surface of the first top wall 32, and the second top wall 33 is positioned to cover a part of the first top wall 32. The interlocking pieces 44 are sandwiched between the back surface of the top inclined wall 35 and the surface of the interlocking pieces 42. The front side (tip side) of the interlocking pieces 44 overlaps the rear side (tip side) surface of the interlocking pieces 42. The second inclined piece 37, excluding the engaging piece 44, is laminated on the surface of the top inclined wall 35. The edge of the engaging hole 40 of the top inclined wall 35 enters the recess 43 of the second inclined piece 37 and is sandwiched between the second inclined piece 37 (excluding the engaging piece 44) and the engaging piece 44. As a result, the second inclined piece 37 is held in a state where it is laminated on the surface of the top inclined wall 35, tilted in the same direction as the top inclined wall 35, without the use of adhesive or the like.

[0058] The packaging box 2 is then assembled (sealed). The second top wall 33 may be fixed to the first top wall 32 with adhesive tape or a shipping label (neither of which are shown). With the packaging box 2 sealed, the first inclined piece 36 and the second inclined piece 37 are not adhered to the top inclined wall 35, but are stacked over the entire front-to-back area of ​​the top inclined wall 35.

[0059] The packaging box 2 according to the second embodiment described above provides the same effects as the packaging box 1 according to the first embodiment, such as making it easier to store articles, widening the article storage space S1 in the height direction, and maintaining the state in which articles are stored. Furthermore, according to the packaging box 2 according to the second embodiment, the first inclined piece 36 is temporarily fixed to the top inclined wall 35 by inserting the interlocking piece 42 of the first inclined piece 36 into the interlocking hole 40, and the packaging box 2 with the rear side open can be temporarily assembled (see Figure 8). This allows the user to quickly store articles in the temporarily assembled packaging box 2. In addition, the pair of openings 2U can be kept closed by the first and second top walls 32 and 33 by inserting the interlocking piece 44 of the second inclined piece 37 into the interlocking hole 40 (see Figure 9). This allows the packaging box 2 to be easily temporarily sealed.

[0060] In the packaging box 2 according to the second embodiment, the latching hole 40 was cut out from the leading edge (flow direction) to the base of the top inclined wall 35 in the left-right direction, but the present invention is not limited thereto. For example, the latching hole may be drilled in the top inclined wall 35 in an annular or slit shape (not shown).

[0061] Furthermore, in the packaging box 2 according to the second embodiment, a latching piece 42 (recess 41) is formed on the first inclined piece 36 and a latching piece 44 (recess 43) is formed on the second inclined piece 37, but the present invention is not limited thereto. Either the latching piece 42 (recess 41) or the latching piece 44 (recess 43) alone may be formed (not shown). For example, if only the latching piece 42 (recess 41) is formed, the first top wall 32 is held in a state where about half of the opening 2U is closed via the latching piece 42 that latches into the latching hole 40. After the articles are placed inside, the second top wall 33 may close the remaining half of the opening 2U and be fixed to the first top wall 32 with adhesive tape or the like (not shown). Furthermore, for example, if only the engaging piece 44 (recess 43) is formed, the first top wall 32 covers a portion of the article placed on the bottom wall 10, and then the second top wall 13 is held in a state where approximately the remaining half of the opening 2U is closed via the engaging piece 44 that engages with the engaging hole 40 (not shown).

[0062] Furthermore, in the packaging box 2 according to the second embodiment, the first and second inclined pieces 36 and 37 had interlocking guide lines L16 and L17 formed on them, but the invention is not limited to this, and the interlocking guide lines L16 and L17 may be omitted (not shown).

[0063] In the packaging box 2 according to the second embodiment, a latching hole 40 was formed in the top inclined wall 35, and recesses 41, 43, latching pieces 42, 44, and latching guide lines L16, L17 were formed in the first and second inclined pieces 36, 37. However, the present invention is not limited thereto. For example, as shown in Figure 10, the latching hole 40, recesses 41, 43, latching pieces 42, 44, and latching guide lines L16, L17 may be omitted. In this case, the packaging box 2 can be sealed by fixing the second top wall 33 to the first top wall 32 with adhesive tape or a shipping label.

[0064] Furthermore, in the packaging box 2 according to the second embodiment (including modified examples; the same applies hereinafter), the first top wall 32 (first inclined piece 36) and the second top wall 33 (second inclined piece 37) were formed to be the same length in the front-to-back direction (step direction), but this is not limited to this, and they may be formed to be different lengths (not shown). If interlocking pieces 42 and 44 are formed, the position of the interlocking holes 40 of the top inclined wall 35 may be changed to match the position of the interlocking pieces 42 and 44 (not shown). Also, when the first inclined piece 36 and the second inclined piece 37 are formed to be different lengths, for example, the second inclined piece 37 located in the uppermost layer may be formed to be longer in the front-to-back direction than the first inclined piece 36, and its dimension may be more than half of the front-to-back dimension of the entire packaging box 2 (not shown).

[0065] In the packaging boxes 1 and 2 according to the first and second embodiments, a first inclined corner wall 18 connecting the side wall 11F, the bottom inclined wall 14, and the first inclined pieces 16 and 36, and a second inclined corner wall 19 connecting the side wall 11R, the bottom inclined wall 14, and the second inclined pieces 17 and 37 were provided. However, the invention is not limited to this, and the first and second inclined corner walls 18 and 19 may be omitted (not shown). In this case, the bottom inclined wall 14 and the top inclined walls 15 and 35 are not limited to a trapezoidal shape, but may be formed in a rectangular shape, for example.

[0066] Furthermore, while the packaging boxes 1 and 2 according to the first and second embodiments were formed from double-sided corrugated cardboard sheets, they are not limited to this and may be formed from single-sided corrugated cardboard sheets, thick paper, or resin boards (sheets), etc. Also, the dimensions (width, depth, height) and shape of each part of the packaging boxes 1 and 2, the thickness of the corrugated cardboard sheet, and the direction in which the core 9A extends may be freely changed.

[0067] The above description of embodiments illustrates one aspect of the packaging box according to the present invention, and the technical scope of the present invention is not limited to the above embodiments. The present invention may be modified, substituted, or transformed in various ways without departing from the spirit of the technical idea, and the claims include all embodiments that may fall within the scope of the technical idea. [Explanation of Symbols]

[0068] 1,2 Packaging box 11F,11R side wall 12,32 First celestial wall 13,33 Second Heavenly Wall 14 Bottom inclined wall 15,35 Top surface sloping wall 16,36 1st inclined piece 17,37 2nd inclined piece 18 1st slope wall 19 Second slope wall 20 Engagement holes 28 Engaging piece 40 engagement holes 41,43 recess 42,44 Hanging piece S1 Containment Space S2 Lateral space

Claims

1. A packaging box (1, 2) for packaging goods, Bottom wall (10) and A pair of side walls (11F, 11R) are erected at both ends of the bottom wall in the first direction, A first top wall (12, 32) extends from the upper end of one side wall toward the other side wall, and faces the bottom wall with the storage space (S1) for accommodating the article in between, A second ceiling wall (13, 33) extends from the upper end of the other side wall toward the first side wall and is positioned to cover part or all of the first ceiling wall, A pair of bottom inclined walls (14) extending diagonally upward outward from both ends of the bottom wall in a second direction perpendicular to the first direction, A pair of top inclined walls (15, 35) extend diagonally upward inward from both ends of the pair of bottom inclined walls in the second direction, are inclined in the opposite direction to the pair of bottom inclined walls, and face the pair of bottom inclined walls across the lateral space (S2), A pair of first inclined pieces (16, 36) extend diagonally downward outward from both ends of the first ceiling wall in the second direction and are laminated on the back or surface of the pair of ceiling inclined walls, The second ceiling wall comprises a pair of second inclined pieces (17, 37) that extend diagonally downward outward from both ends in the second direction of the second ceiling wall and are laminated on the surface of the pair of ceiling inclined walls, The packaging box is characterized in that the top inclined wall overlaps at least one of the first inclined piece and the second inclined piece at any position within the entire area of ​​the first direction.

2. Connecting the bottom inclined wall and the first inclined piece, a pair of first inclined corner walls (18) are formed in a triangular shape projecting outward from both ends of one of the side walls in the second direction, and are provided in a position that is inclined toward one side in the first direction as they move away from each other in the second direction, The system further comprises a pair of second inclined corner walls (19) that connect the bottom inclined wall and the second inclined piece, and are formed in a triangular shape that protrudes outward from both ends of the other side wall in the second direction, and are provided in a position that is inclined toward the other in the first direction as they move away from each other in the second direction, The bottom inclined wall is formed in a trapezoidal shape between the first inclined corner wall and the second inclined corner wall, The packaging box according to claim 1, characterized in that the top inclined wall is formed in a trapezoidal shape that is symmetrical with respect to the bottom inclined wall, with the boundary with the bottom inclined wall as the center line.

3. The aforementioned top inclined wall (15) is laminated on the surface of the first inclined piece (16), A pair of engagement holes (20) are opened on both sides of the first top wall in the second direction. The packaging box according to claim 1 or 2, characterized in that the top inclined wall is provided with a series of engaging pieces (28) that are inserted into the engaging holes.

4. The first inclined piece (36) and the second inclined piece (37) are laminated on the surface of the top inclined wall (35), A fitting hole (40) is opened in the aforementioned inclined top wall. The packaging box according to claim 1 or 2, characterized in that at least one of the first inclined piece and the second inclined piece is partitioned by recesses (41, 43) cut out from the free end in the second direction, where the engaging piece (42, 44) inserted into the engaging hole is located.

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