Packing box

Abstract

To provide a packaging box stably and vertically stackable in an open state, and reduced in assembling time.SOLUTION: In a packaging box, base pieces 240, 280 are folded inward following to a base end folding line L0, in relation to each of a front side board 14 and a rear side board 18, and are horizontally extended to partially cover a storage part from above at diagonal positions of the storage part. The base pieces 240, 280 are supported by upper edges of right and left side boards. The base pieces 240, 280 are supported at the other ends by a bottom part of the storage part, via first tongue pieces 241, 281 folded inward in relation to the base pieces 240, 280, and second tongue pieces 242, 282 folded outward in relation to the first tongue pieces 241, 281.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] A packaging box has been proposed that can be stably stacked one on top of the other in an opened state that exposes the items stored inside (see Patent Document 1). Specifically, the base end of the top flap is bent inward relative to the side plate and kept horizontal, and the tip end of the top flap is further bent inward relative to the base end, and the tip end is connected to the side plate. The base end of the top flap is supported by the side plate in a state of protruding inward at the top end of the packaging box, and other packaging boxes stacked on top of the packaging box are stably supported. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2003-155025 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, since an operation for connecting the leading ends of the top flaps to the side panels is required, the time required for assembling the packaging box tends to be longer.

[0005] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a packaging box which can be stably stacked one on top of the other in an opened state and which can reduce the assembly time. [Means for solving the problem]

[0006] The packaging box of the present invention is A paper packaging box comprising a bottomed rectangular tubular storage section and a top flap connected to a pair of side panels spaced apart from each other among a plurality of side panels constituting the storage section via a fold line extending laterally along the upper edges of the pair of side panels, The top flap is A base piece connected to each of the pair of side plates via a base end fold line as the fold line; A first tongue piece connected to the base piece via a first fold line extending laterally on the opposite side to the base fold line; A second tongue piece is connected to the first tongue piece via a second fold line extending laterally on the opposite side of the first fold line, At least a pair of the base pieces are bent inward at one end edge toward each of the pair of side panels along the base end fold line and extend in a horizontal position so as to partially cover the storage section from above at a diagonal position of the storage section, and are supported by the upper end edge of another of the plurality of side panels that is connected to each of the pair of side panels, and are supported at the other end edge by the bottom of the storage section via a first tongue piece that is bent inward toward each of the pair of side panels along the first fold line relative to the base piece, and a second tongue piece that is bent outward relative to the first tongue piece along the second fold line and has a tip abutting the bottom of the storage section.

[0007] According to the packaging box of this configuration, the base piece is folded inwardly relative to each of the pair of side plates along the base end crease lines, and extends in a horizontal position at a diagonal position of the storage section so as to partially cover the storage section from above. When such a packaging box is in an opened state, the base piece is supported by the upper end edges of other side plates that are connected to each of the pair of side plates among the multiple side plates. Also, the base piece is supported at the other end edge by the bottom of the storage section via a first tongue piece that is folded inwardly relative to the base piece toward each of the pair of side plates along the first crease line, and a second tongue piece that is folded outwardly relative to the first tongue piece along the second crease line and has a tip portion abutting the bottom of the storage section. When another packaging box is stacked on top of the opened packaging box, the other packaging box is supported by at least a pair of base pieces, so that the opened packaging boxes can be stably stacked one on top of the other.

[0008] The base piece is folded inward along the base crease lines relative to each of the pair of side panels so as to extend horizontally, (2) the first tongue piece is folded inward along the first crease line relative to the base piece, toward each of the pair of side panels, and (3) the second tongue piece is folded outward along the second crease line relative to the first tongue piece so as to abut its tip against the bottom of the storage section, thereby realizing a support structure for the base piece. In this case, a work step of connecting the base piece, the first tongue piece, and / or the second tongue piece to the side panels is not required. Therefore, the assembly time of the packaging box that can be stably stacked vertically in the opened state as described above is shortened accordingly. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a development view of a packaging box according to one embodiment of the present invention. [Diagram 2] 1 is a perspective view of a packaging box according to an embodiment of the present invention; [Diagram 3] FIG. [Figure 4] FIG. 11 is a first conceptual explanatory diagram relating to a transition mode of an assembled state of a packaging box. [Diagram 5]FIG. 11 is a second conceptual explanatory diagram relating to a transition mode of an assembled state of a packaging box. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] (Blank configuration) FIG. 1 shows a blank for a packaging box according to one embodiment of the present invention. A corrugated cardboard sheet having a corrugated paper core laminated with a liner is generally used as the blank for the packaging box. The corrugated cardboard sheet is punched out and score lines are provided as shown by solid lines in FIG. 1, and fold lines are provided as shown by dashed lines and dashed lines, to obtain a blank before assembly. The score lines are provided by incision lines and / or cutting auxiliary lines (for example, perforations). The blank shown in FIG. 1 corresponds to the inside of the packaging box, and when assembling the packaging box, the fold lines shown by dashed lines are valley-folded with respect to the paper surface of FIG. 1, and the fold lines shown by dashed lines are mountain-folded with respect to the paper surface of FIG. 1.

[0011] The blank shown in FIG. 1 includes a horizontal connecting piece 11, a left outer panel 12, a front panel 14, a right outer panel 16, a rear panel 18, a left upper flap 22, a front upper flap 24, an upper right flap 26, a rear upper flap 28, a left lower flap 42, a front lower flap 44, a right lower flap 46 and a rear lower flap 48, each of which is substantially rectangular.

[0012] As shown in FIG. 1, the horizontal connecting piece 11, the left outer panel 12, the front panel 14, the right outer panel 16, and the rear panel 18 are connected laterally from the left via fold lines. The left upper flap 22 and the right upper flap 26 are connected to the left outer panel 12 and the right outer panel 16 via the left upper connecting piece 122 and the right upper connecting piece 162, which are sandwiched between a pair of fold lines at the upper side. The front panel 14 and the rear panel 18 are connected to the front upper flap 24 and the rear upper flap 28 via the upper fold lines. The left lower flap 42, the front lower flap 44, the right lower flap 46, and the rear lower flap 48 are connected to the left outer panel 12, the front panel 14, the right outer panel 16, and the rear panel 18 via the lower fold lines.

[0013] In this embodiment, the front side panel 14 and the rear side panel 18 correspond to a "pair of side panels", and the front upper flap 24 and the rear upper flap 28 each correspond to a "top flap". The left outer panel 12 and the right outer panel 16 each correspond to an "outer panel" that constitutes a double-structure side panel as the "other side panel" as described below.

[0014] As shown in Fig. 1, the left upper flap 22 includes a left inner plate 222 connected to the upper left connecting piece 122 via a fold line, and a left bottom flap 224 connected to the upper left inner plate 222 via a fold line. The fold line between the left inner plate 222 and the left bottom flap 224 extends laterally across one long side of a downwardly facing, generally convex-shaped opening 2240 formed in the middle of the left upper flap 22. The left bottom flap 224 is generally convex-shaped with an upper portion asymmetrically cut into a generally rectangular shape on both the left and right sides of Fig. 1, and has side edges 2242, 2244 corresponding to the cut portions.

[0015] Similarly, as shown in Fig. 1, the upper right flap 24 includes a right inner plate 242 connected to the upper right connecting piece 142 via a fold line, and a right bottom flap 244 connected to the upper right inner plate 242 via a fold line. The fold line between the right inner plate 242 and the right bottom flap 244 extends laterally across one long side of a substantially convex-shaped opening 2440 formed in the middle of the upper right flap 24. The right bottom flap 244 is substantially convex-shaped with a substantially rectangular asymmetrical cutout at both the left and right upper portions in Fig. 1, and has side edges 2442, 2444 at the cutout portions.

[0016] 1, the front upper flap 24 (one of the top flaps) includes a pair of base pieces 240, a pair of first tongue pieces 241, and a second tongue piece 242. Similarly, the rear upper flap 28 (the other top flap) includes a pair of base pieces 280, a pair of first tongue pieces 281, and a second tongue piece 282.

[0017] As shown in Fig. 1, each of the pair of base pieces 240, 280 is substantially trapezoidal and connected to the front panel 14 and the rear panel 18 at the lower base side via a pair of base end fold lines L0 spaced apart from each other at the upper end edges of the front panel 14 and the rear panel 18. Each of the pair of first tongue pieces 241, 281 is substantially rectangular and has a height greater than that of the substantially trapezoidal base pieces 240, 280, and is connected to each of the pair of base pieces 240, 280 at the upper base side of the pair of base pieces 240, 280 via a pair of first fold lines L1 extending laterally on the opposite side of the pair of base end fold lines L0. The second tongue pieces 242, 282 are substantially rectangular and connected to each of the pair of first tongue pieces 241, 281 via a pair of second fold lines L2 extending laterally on the opposite side of the pair of first fold lines L0.

[0018] As shown in Fig. 1, the second tongues 242, 282 are connected to the first tongues 241, 281 via a second fold line L2 in a first extension range A1, which is a part of the horizontal extension range of the second tongues 242, 282. The second tongues 242, 282 have vertical tongues 2420, 2820 that locally protrude in the vertical direction toward the base end fold line L0 based on the second fold line L2 in a second extension range A2 adjacent to the first extension range A1 among the horizontal extension ranges of the second tongues 242, 282. In the second tongues 242, 282, the tip portions 2422, 2822 on the opposite side of the vertical tongues 2420 can be folded relative to the base along the intermediate fold line L4.

[0019] In this embodiment, the vertical positions of the middle fold lines L4 are different in the front upper flap 24 and the rear upper flap 28. This corresponds to the fact that, as described above, the left bottom flap 224 and the right bottom flap 264 each have a generally convex shape with the upper portions cut out asymmetrically on both the left and right sides in FIG.

[0020] 1, the front side plate 14 has a vertical protruding piece 142 extending vertically from a portion sandwiched between a pair of base end fold lines L0 at the upper end edge of the front side plate 14 toward the second tongue piece 242 or its vertical tongue piece 2420, independent of the base piece 240. Similarly, the rear side plate 18 has a vertical protruding piece 182 extending vertically from a portion sandwiched between a pair of base end fold lines L0 at the upper end edge of the rear side plate 18, independent of the base piece 280, toward the second tongue piece 282 or its vertical tongue piece 2820.

[0021] As shown in FIG. 1, the left outer panel 12 and the left lower flap 42 are connected via a pair of fold lines extending laterally across a slit formed in the lower center of the left outer panel 12. The right outer panel 16 and the right lower flap 46 are connected via a pair of fold lines extending laterally across a slit formed in the lower center of the right outer panel 16. A substantially rectangular opening is formed at the connecting portion of the front panel 14 and the front lower flap 44, and the front panel 14 and the front lower flap 44 are connected via a pair of fold lines extending laterally across the opening. A substantially rectangular opening is formed at the connecting portion of the rear panel 18 and the rear lower flap 48, and the rear panel 18 and the rear lower flap 48 are connected via a pair of fold lines extending laterally across the opening.

[0022] (Packaging Box Composition) 2 has a bottomed rectangular tubular storage section that is partially covered from above at each of the four corners by four base pieces 240, 280. The bottom of the storage section is formed by a left lower flap 42, a front lower flap 44, a right lower flap 46 and a rear lower flap 48 that are folded inward along lower creases with respect to each of the left outer panel 12, the front panel 14, the right outer panel 16 and the rear panel 18, and are fixed to each other in a substantially horizontal position.

[0023] The left side plate constituting the storage section is configured as a double-structure side plate by the left outer plate 12 and the left inner plate 222 bent inward along a pair of crease lines so as to overlap the left outer plate 12 on the inside. The left upper connecting piece 122 extends in the front-rear direction in a substantially horizontal position along a part of the upper edge of the left side plate as a double-structure side plate. Similarly, the right side plate constituting the storage section is configured as a double-structure side plate by the right outer plate 16 and the right inner plate 262 bent inward along a pair of crease lines so as to overlap the right outer plate 16 on the inside. The right upper connecting piece 162 extends in the front-rear direction in a substantially horizontal position along a part of the upper edge of the left side plate as a double-structure side plate.

[0024] The left bottom flap 224 is folded outwardly from the left inner panel 222 along a fold line and abuts against the bottom of the storage section in a generally horizontal position. Similarly, the right bottom flap 264 is folded outwardly from the right inner panel 262 along a fold line and abuts against the bottom of the storage section in a generally horizontal position. The left bottom flap 224 and the right bottom flap 264 may abut along their respective leading edges or may be spaced apart from each other.

[0025] 2, two pairs of base pieces 240, 280 are folded inward at one end along a base fold line L0 with respect to each of the pair of side plates, the front plate 14 and the rear plate 18, and extend in a horizontal position at a diagonal position of the storage section. In this state, the base pieces 240, 280 are supported by the upper edge of one of the left plate and the right plate along the outer legs extending approximately perpendicular to the upper and lower bases of the non-isosceles trapezoid.

[0026] The first tongues 241, 281 are folded inwardly relative to the base pieces 240, 280 along the first fold line L1 toward the front panel 14 and the rear panel 18, respectively. The second tongues 242, 282 are folded outwardly relative to the first tongues 241, 281 along the second fold line L2, and abut against the front panel 14 and the rear panel 18 at their bases. In one of the second tongues 242, the tip 2422 is folded outwardly relative to the base along the intermediate fold line l4, and abuts against the bottom of the storage section at its tip edge in a position inclined relative to the vertical direction. In the other of the second tongues 282, the tip 2822 is folded outwardly relative to the base along the intermediate fold line l4, and abuts against the bottom of the storage section as a whole in a substantially horizontal position.

[0027] The tip 2422 of one second tongue 242 is secured at its tip edge by a side edge 2242 in one cutout portion of the left bottom flap 224 and a side edge 2642 in one cutout portion of the right bottom flap 264. Similarly, the tip 2822 of the other second tongue 282 is secured at its tip edge by a side edge 2244 in the other cutout portion of the left bottom flap 224 and a side edge 2644 in the other cutout portion of the right bottom flap 264.

[0028] The base pieces 240, 280 are supported by the bottom of the storage section in the first extension range A1 via the first tongue pieces 241, 281 and the second tongue pieces 242, 282. Furthermore, the base pieces 240, 280 are supported by the bottom of the storage section in the second extension range A2 (to be precise, the extension range A20 which is a part of the second extension range A2) via the vertical tongue pieces 2420, 2820 of the second tongue pieces 242, 282.

[0029] A vertical protruding piece 142 extends in a substantially vertical position independent of the base piece 240 from a portion sandwiched between a pair of base end fold lines L0 at the upper edge of the front side plate 14. Similarly, a vertical protruding piece 142 extends in a substantially vertical position independent of the base piece 240 from a portion sandwiched between a pair of base end fold lines L0 at the upper edge of the rear side plate 14.

[0030] (Assembly of packaging boxes) An example of a method for assembling the packaging box shown in Fig. 2 from the blank shown in Fig. 1 will be described. The packaging box may be assembled according to a procedure different from this example.

[0031] First, the connecting piece 11, the left outer panel 12, the front panel 14, the right outer panel 16 and the rear panel 18 are folded relative to one another along the crease lines, and then the connecting piece 11 is bonded to the left end of the rear panel 18. This results in a blank having a generally parallelogram-shaped tube. Next, the left lower flap 42, the front lower flap 44, the right lower flap 46 and the rear lower flap 48 are folded inward relative to the left outer panel 12, the front panel 14, the right outer panel 16 and the rear panel 18, respectively, along the crease lines.

[0032] With the left lower flap 42, the front lower flap 44, the right lower flap 46, and the rear lower flap 48 incompletely engaged with each other, the approximately parallelogram tubular blank is deformed into an approximately rectangular tubular shape, so that the left lower flap 42, the front lower flap 44, the right lower flap 46, and the rear lower flap 48 are completely engaged with each other. The left lower flap 42, the front lower flap 44, the right lower flap 46, and the rear lower flap 48 are bonded or fixed to each other as necessary to form the bottom of the packaging box. Figure 3A shows the packaging box in this state, that is, in a state where the bottomed rectangular tubular storage section is not covered from above by the flaps 22, 24, 26, and 28, or in an opened state. In this state, an article such as fruit or vegetable is stored in the storage section.

[0033] The upper left connecting piece 122 is folded inward along the crease relative to the left outer plate 12, the upper left flap 22 or the left inner plate 222 is folded inward relative to the upper left connecting piece 122, and the left bottom flap 224 is folded outward relative to the left inner plate 222. As a result, a left side plate as a double-structure side plate is formed by the left outer plate 12 and the left inner plate 222 facing the left outer plate 12 in a substantially vertical position, and the upper left connecting piece 122 is held in a substantially horizontal position along part of the upper edge of the left side plate, and the left bottom flap 224 is in abutment against the bottom of the storage section in a substantially horizontal position.

[0034] Similarly, the upper right connecting piece 162 is folded inward along the crease relative to the right outer plate 16, the upper right flap 26 or the right inner plate 262 is folded inward relative to the upper right connecting piece 162, and the right bottom flap 264 is folded outward relative to the right inner plate 262. As a result, a right side plate as a double-structure side plate is formed by the right outer plate 16 and the right inner plate 262 facing the right outer plate 16 in a substantially vertical position, and the upper right connecting piece 162 is held in a substantially horizontal position along part of the upper edge of the right side plate, and the right bottom flap 264 is in a substantially horizontal position in contact with the bottom of the storage section.

[0035] FIG. 3B shows the left and right side panels formed as dual-layer side panels, with the left and right bottom flaps 224, 264 each abutting against the bottom of the storage section in a generally horizontal position.

[0036] Figures 4A to 4D conceptually show state transitions in the first extension region A1 of the rear-upper flap 28. Figures 5A to 5D conceptually show state transitions in the second extension region A2 of the rear-upper flap 28. Each of Figures 4A and 5A shows a state in which the rear-upper flap 28 is not folded with respect to the rear side plate 18 and is in a substantially vertical position.

[0037] 4B and 5B, the base piece 280 is folded inward relative to the rear panel 18 along the base end fold line L0, the first tongue piece 281 is folded inward relative to the base piece 280 toward the rear panel 18 along the first fold line L1, the second tongue piece 282 is folded outward relative to the first tongue piece 281 along the second fold line L2, and the tip portion 2822 of the second tongue piece 282 is folded outward relative to the base along the middle fold line L4. FIG. 3C shows the packaging box in this state.

[0038] Similarly, the base piece 240 is bent inward relative to the front panel 14 along the base fold line L0, the first tongue piece 241 is bent inward relative to the base piece 240 toward the front panel 14 along the first fold line L1, the second tongue piece 242 is bent outward relative to the first tongue piece 241 along the second fold line L2, and the tip portion 2422 of the second tongue piece 242 is bent outward relative to the base along the intermediate fold line L4.

[0039] Then, the base of the second tongue 282 is brought closer to the inside of the rear side panel 18, and the tip 2822 of the second tongue 282 is brought closer to the bottom of the storage section. As a result, as shown in Figs. 4C and 5C, the base of the second tongue 282 abuts against the inside of the rear side panel 18 in a substantially vertical position, and the tip 2822 of the second tongue 282 abuts against the bottom of the storage section in a substantially horizontal position. Furthermore, the tip edge of the tip 2822 engages with the side edges 2244, 2644 in one of the notches of the left bottom flap 224 and the right bottom flap 264. At this time, the surface height of the tip 2822 of the second tongue 282 and the surface height of the left bottom flap 224 and the right bottom flap 264 are substantially the same.

[0040] Furthermore, base piece 280 is supported in a substantially horizontal position by the upper edges of the left and right plates, which are double-structure side plates that make up the storage section, excluding upper left connecting piece 122 and upper right connecting piece 162. At this time, the height of the surface of base piece 280 and the height of the surface of upper left connecting piece 122 are substantially the same.

[0041] As shown in Fig. 4C, the base piece 280 is supported by the bottom of the storage section in the first extension range A1 via the first tongue piece 281 and the second tongue piece 282. Furthermore, as shown in Fig. 5C, the base piece 280 is supported by the bottom of the storage section in the second extension range A2 (more precisely, the extension range A20 which is a part of it) via the vertical tongue piece 2820 of the second tongue piece 282. Fig. 3D shows the state of the packaging box in this state.

[0042] Similarly, the base of the second tongue 242 is brought closer to the inside of the front panel 14, and the tip 2422 of the second tongue 242 is brought closer to the bottom of the storage section. As a result, the base of the second tongue 242 abuts against the inside of the front panel 14 in a substantially vertical position (see FIGS. 4C and 5C), and the tip 2422 of the second tongue 242 abuts against the bottom of the storage section at the tip edge in a position inclined relative to the vertical direction. Furthermore, the tip edge of the tip 2422 engages with the side edges 2242, 2642 at the other notches of the left bottom flap 224 and the right bottom flap 264. At this time, the surface height of the tip 2422 of the second tongue 242 and the surface height of the left bottom flap 224 and the right bottom flap 264 are substantially the same.

[0043] Furthermore, base piece 240 is supported in a substantially horizontal position by the upper edges of the left and right plates, which are double-structure side plates that make up the storage section, excluding upper left connecting piece 122 and upper right connecting piece 162. At this time, the height of the surface of base piece 240 and the height of the surface of upper left connecting piece 122 are substantially the same.

[0044] The base piece 240 is supported by the bottom of the storage section via the first tongue piece 241 and the second tongue piece 242 in the first extension range A1 (see FIG. 4C). Furthermore, the base piece 240 is supported by the bottom of the storage section via the vertical tongue piece 2420 of the second tongue piece 242 in the second extension range A2 (more precisely, the extension range A20 which is a part of the second extension range A2) (see FIG. 5C).

[0045] Through this series of steps, an unopened packaging box as shown in Figure 2 is completed.

[0046] (Functions of packaging box) According to the packaging box shown in Fig. 2 as one embodiment of the present invention, the base pieces 240, 280 are folded inwardly relative to the front panel 14 and the rear panel 18 along the base end fold line L0, and extend in a horizontal position at a diagonal position of the storage section so as to partially cover the storage section from above (see Figs. 3D, 4C, and 5C). The base pieces 240, 280 are supported by the upper edges of the left and right panels. In addition, the base pieces 240, 280 are supported at the other edge by the bottom of the storage section via first tongue pieces 241, 281 folded inwardly relative to the base pieces 240, 280 and second tongue pieces 242, 282 folded outwardly relative to the first tongue pieces 241, 281 (see Figs. 3D, 4C, and 5C). When one packaging box is stacked on top of another packaging box, the bottom box of the other packaging box is supported at its four corners by two pairs of base pieces 240, 280, so that a plurality of opened packaging boxes can be stably stacked one on top of the other.

[0047] In addition, the left upper connecting piece 122 and the right upper connecting piece 162, which extend along part of the upper edges of the left and right side panels of one packaging box in a substantially horizontal position, support the bottom of the other packaging box at the left and right side edges, so that multiple opened packaging boxes can be stacked one on top of the other in a more stable manner.

[0048] Furthermore, the pair of vertical protruding pieces 142, 182 of one packaging box prevents the pair of side plates (front side plate 14 and rear side plate 18) constituting the storage section of another packaging box stacked on top of the one packaging box from being displaced in the front-rear direction. This allows multiple opened packaging boxes to be stacked one on top of the other in a more stable manner.

[0049] The base pieces 240, 280 are folded inward along the base end fold line L0 relative to the front panel 14 and the rear panel 18 so as to extend in the horizontal direction, (2) the first tongues 241, 281 are folded inward along the first fold line L1 relative to the base pieces 240, 280, and (3) the second tongues 242, 282 are folded outward along the second fold line L2 relative to the first tongues 241, 281 so as to abut their tip portions 2422, 2822 against the bottom of the storage section (see Figs. 3C, 4B, and 5B). This achieves a support structure for the base pieces 240, 280. At this time, no work step is required to connect the base pieces 240, 280, the first tongues 241, 281, and / or the second tongues 242, 282 to the side panels 14, 18. This accordingly reduces the assembly time for packaging boxes that can be stably stacked vertically in the opened state as described above.

[0050] (Another embodiment of the present invention) In the above embodiment, the packaging box in the opened state is assembled from the blank shown in Fig. 1, but in other embodiments, a substantially rectangular parallelepiped-shaped packaging box in the opened state may be assembled from blanks of various shapes different from these. In the above embodiment, the four side plates 12, 14, 16, 18 and the four lower flaps 42, 44, 46, 48 form a bottomed rectangular tubular storage section, but in other embodiments, the storage section may be a bottomed triangular tubular section or a bottomed N-sided tubular section (N is an integer of 5 or more).

[0051] In the above embodiment, the base pieces 240, 280, which are bent inwardly along the base end fold line L0 with respect to each of the pair of side plates 14, 18 and extend in a horizontal position, are supported by the bottom of the storage section via the second tongue pieces 242, 282 in at least a part A20 of the first extension range A1 and the second extension range A2 (see Figs. 4C and 5C), but in another embodiment, at least one of the base pieces 240, 280 may be supported by the bottom of the storage section via the second tongue pieces 242, 282 only in the first extension range A1 (see Fig. 4C). In this case, at least one of the second tongue pieces 242, 282 may not have the vertical tongue pieces 2420, 2820.

[0052] In the above embodiment, the second tongues 242, 282, which are bent inward relative to the first tongues 241, 281 and abut the bottom of the storage section at their tips 2422, 2822, abut against the side panels 14, 18 at their bases (see Figures 4C and 5C), but in other embodiments, at least one of the second tongues 242, 282, which are bent inward relative to the first tongues 241, 281 and abut the bottom of the storage section at their tips 2422, 2822, may be spaced apart from the side panels 14, 18.

[0053] In the above embodiment, the tip portions 2422, 2822 of the second tongues 242, 282 are bent outward from the base via the intermediate fold line L4 and abut against the bottom of the storage section (see Figures 4C and 5C), but in other embodiments, the second tongues 242, 282, which remain approximately flat, may abut against the bottom of the storage section at their tip edges.

[0054] In the above embodiment, the left and right side panels are configured as double-structure side panels made up of outer panels 12, 16 and inner panels 222, 262 bent inward so as to overlap the inner sides of the outer panels 12, 16. However, in other embodiments, at least one of the side panels may be configured as a single-structure side panel made up only of the outer panels 12, 16.

[0055] In the above embodiment, when the bottom flap 224, 264 is folded against the inner plate 222, 262 constituting the double-structure side plate, the tip 2422, 2822 of the second tongue 242, 282 is engaged with the side edge 2242, 2244, 2642, 2644 of the bottom flap 224, 264 (see Figs. 4C and 5C), but in other embodiments, the tip 2422, 2822 of at least one of the second tongues 242, 282 may not be engaged with the side edge 2242, 2244, 2642, 2644 of the bottom flap 224, 264. At least one of the left bottom flap 224 and the right bottom flap 264 may be omitted.

[0056] In the above embodiment, the upper connecting pieces 122, 162 may be omitted, and the outer panels 12, 16 and the inner panels 222, 262 may be connected to each other via a pair of fold lines, and the outer panels 12, 16 and the inner panels 222, 262 may be connected to each other via a single fold line.

[0057] In the above embodiment, the upper flaps 24, 28 (top flaps) have a pair of base pieces 240, 280, a pair of first tongue pieces 241, 281, and a pair of second tongue pieces 242, 282, which are connected in sequence via fold lines L0, L1, and l2 (see Figure 1), but in other embodiments, the upper flaps 24, 28 (top flaps) may have a single base piece 240, 280, a single first tongue piece 241, 281, and a single second tongue piece 242, 282, which are connected in sequence via fold lines L0, L1, and l2. The upper flaps 24, 28 (top flaps) may comprise N (N is a positive number greater than or equal to 3) independent base pieces 240, 280 connected in sequence via fold lines L0, L1 and l2, N first tongue pieces 241, 281, and one or more second tongue pieces 242, 282.

[0058] In the above embodiment, at least one of the vertical protruding pieces 142, 182 may be omitted. [Explanation of symbols]

[0059] 11. connecting piece, 12. left outer plate, 14. front plate, 16. left outer plate, 18. rear plate, 22. left upper flap, 24. front upper flap, 26. right upper flap, 28. rear upper flap, 42. left lower flap, 44. front lower flap, 46. right lower flap, 48. rear lower flap, 122. left upper connecting piece, 142. vertical protruding piece, 162. right upper connecting piece, 182. vertical protruding piece, 222. left inner plate, 224. left bottom flap, 240. base piece, 241. first tongue piece, 242. second tongue piece, 26 2: Right inner plate, 264: Left bottom flap, 280: Base piece, 281: First tongue piece, 282: Second tongue piece, 2242: One side edge of left bottom flap, 2244: Other side edge of left bottom flap, 2420: Vertical tongue piece, 2422: Tip of second tongue piece, 2642: One side edge of right bottom flap, 2644: Other side edge of right bottom flap, 2820: Vertical tongue piece, 2822: Tip of second tongue piece, A1: First extension region, A2: Second extension region, A20: Part of second extension region, L0: Base piece end Fold lines: L1: first fold line, L2: second fold line, L4: intermediate fold line.

Claims

1. A paper packaging box comprising a bottomed rectangular tubular storage section and a top flap connected to a pair of side panels spaced apart from each other among a plurality of side panels constituting the storage section via a fold line extending laterally along the upper edges of the pair of side panels, The top flap is A base piece connected to each of the pair of side plates via a base end fold line as the fold line; a first tongue piece connected to the base piece via a first fold line extending laterally on the opposite side to the base end fold line; A second tongue piece is connected to the first tongue piece via a second fold line extending laterally on the opposite side of the first fold line, at least one pair of the base pieces are bent inwardly along the base fold line relative to each of the pair of side panels at one end edge and extend in a horizontal position so as to partially cover the storage section from above at a diagonal position of the storage section, and are supported by upper ends of other side panels among the plurality of side panels that are connected to each of the pair of side panels, and are supported by a bottom of the storage section at the other end edge via a first tongue piece that is bent inwardly toward each of the pair of side panels along the first fold line relative to the base piece, and a second tongue piece that is bent outwardly away from each of the pair of side panels along the second fold line relative to the first tongue piece and has a tip portion abutting the bottom of the storage section, The second tongue has a first extension range that is a part of the lateral extension range of the second tongue, the first tongue is connected to the first tongue via the second fold line, and in a second extension range of the lateral extension range of the second tongue that is adjacent to the first extension range, the second tongue has a vertical tongue that locally protrudes in a vertical direction from the second fold line toward the base end fold line, The base piece is bent inwardly along the base end fold line with respect to each of the pair of side plates and extends in a horizontal position at a diagonal position of the storage section, and is supported by the bottom via the first tongue piece and the second tongue piece in the first extension range, and the back surface of the base piece is supported by the bottom via a tip edge of the vertical tongue piece of the second tongue piece which is bent along the second fold line with respect to the first tongue piece in at least a part of the second extension range. A packaging box characterized by:

2. The packaging box according to claim 1, The second tongue piece is bent along the second fold line relative to the first tongue piece and is in contact with the at least one side plate. A packaging box characterized by:

3. The packaging box according to claim 1 or 2, The tip of the second tongue is bent outwardly away from each of the pair of side plates via intermediate fold lines extending laterally relative to the base of the second tongue, and abuts against the bottom of the storage section. A packaging box characterized by:

4. The packaging box according to any one of claims 1 to 3, The other side panel is configured as a double-structure side panel by an outer panel and an inner panel that is connected to the outer panel via a fold line extending laterally along an upper edge of the outer panel and is folded inward along the fold line so as to overlap the outer panel on the inside, a bottom flap connected to the inner panel via a fold line extending laterally opposite the outer panel; When the bottom flap is folded along the fold line relative to the inner plate constituting the double-structure side plate so as to fit along the bottom of the storage section, the tip of the second tongue is engaged with the side edge of the bottom flap. A packaging box characterized by:

5. The packaging box according to claim 4, Each of the inner plate and the outer plate is connected to an upper connecting piece extending parallel to a portion of the upper edge of the other side plate that is different from the portion supporting the base piece via a pair of fold lines, The inner plate and the outer plate form a double-structure side plate in a state where the upper connecting piece is folded along the pair of fold lines, and the upper connecting piece extends in a horizontal position along the upper edge of the other side plate. A packaging box characterized by:

6. The packaging box according to any one of claims 1 to 5, The top flap is A pair of base pieces connected to each of the pair of side plates via a pair of base end fold lines spaced apart from each other at upper edges of the pair of side plates; a pair of first tongues connected to the pair of base pieces via a pair of first fold lines extending laterally on opposite sides of the pair of base end fold lines; and a second tongue piece connected to each of the pair of first tongue pieces via a pair of second fold lines extending laterally on the opposite side of the pair of first fold lines. A packaging box characterized by:

7. The packaging box according to any one of claims 1 to 6, The pair of side panels further includes a vertical protruding piece that is connected to the upper edge of each of the pair of side panels at a point different from the base end fold line and extends vertically independently from the base piece. A packaging box characterized by:

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