JP7625341B2 - Packaging box - Google Patents

Description

The present invention relates to a packaging box.

A packaging box has been proposed that can be stably stacked one on top of the other in an open 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 to keep it horizontal, and the tip of the top flap is bent further inward relative to the base end, and the tip is connected to the side plate. The base end of the top flap is supported by the side plate in a state where it protrudes inward at the top end of the packaging box, and other packaging boxes stacked on top of the packaging box are stably supported.

JP 2003-155025 A

However, because of the work required to connect the top flap's tip to the side panel, assembling the packaging box tends to take longer.

The present invention aims to provide a packaging box that can be stably stacked vertically when opened and that can shorten the assembly time.

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 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 a pair of the base pieces are bent inward at one end edge toward each of the pair of side panels along the base 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 edges of other side panels among the plurality of side panels that are 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.

In the packaging box of this configuration, the base piece is folded inwardly along the base crease lines relative to each of the pair of side panels, 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 the packaging box is in an open state, the base piece is supported by the upper edge of another side panel that is connected to each of the pair of side panels among the multiple side panels. In addition, the base piece is supported at the other edge by the bottom of the storage section via a first tongue piece that is folded inwardly toward each of the pair of side panels along a first crease line relative to the base piece, and a second tongue piece that is folded outwardly relative to the first tongue piece along a 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.

The base piece is folded inward along the base crease line relative to each of the pair of side panels so that it extends 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 that its tip abuts against the bottom of the storage section, thereby realizing a support structure for the base piece. In this case, no work process is required to connect the base piece, the first tongue piece, and/or the second tongue piece to the side panels. This accordingly shortens the assembly time for packaging boxes that can be stably stacked vertically in the opened state as described above.

FIG. 1 is a development view of a packaging box according to one embodiment of the present invention. 1 is a perspective view of a packaging box according to an embodiment of the present invention; FIG. 11A to 11C are first conceptual explanatory diagrams relating to transitions of assembled states of a packaging box. FIG. 11 is a second conceptual explanatory diagram regarding a transition mode of an assembled state of a packaging box.

(Blank Configuration)
FIG. 1 shows a blank for a packaging box according to an 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 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 assistant 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.

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, an upper left flap 22, an upper front flap 24, an upper right flap 26, an upper rear flap 28, a lower left flap 42, a lower front flap 44, a lower right flap 46, and a lower rear flap 48, each of which is substantially rectangular.

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 top. The front panel 14 and the rear panel 18 are connected to the front upper flap 24 and the rear upper flap 28 via 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 lower fold lines.

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.

As shown in FIG. 1, the upper left 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 downward, approximately convex-shaped opening 2240 formed in the middle of the upper left flap 22. The left bottom flap 224 is approximately convex in shape with an asymmetrical, approximately rectangular cut-out at the top on both the left and right sides of FIG. 1, and has side edges 2242, 2244 corresponding to the cut-out.

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 roughly convex-shaped opening 2440 formed in the middle of the upper right flap 24. The right bottom flap 244 is roughly convex-shaped with a roughly rectangular asymmetrical cutout on both the left and right upper sides in FIG. 1, and has side edges 2442, 2444 at the cutout.

As shown in FIG. 1, the front upper flap 24 (one of the top flaps) has 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) has a pair of base pieces 280, a pair of first tongue pieces 281, and a second tongue piece 282.

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

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 protrude locally in the vertical direction toward the base fold line L0 based on the second fold line L2 in a second extension range A2 that is adjacent to the first extension range A1 of the horizontal extension range 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.

In this embodiment, the vertical positions of the middle fold line L4 in each of the front upper flap 24 and the rear upper flap 28 are different. This corresponds to the fact that, as described above, each of the left bottom flap 224 and the right bottom flap 264 has a generally convex shape with the upper portion asymmetrically missing on both the left and right sides of FIG. 1.

As shown in FIG. 1, the front side plate 14 has a vertical protruding piece 142 that extends 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 that extends 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.

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 joint between 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 joint between 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.

(Composition of packaging box)
The packaging box in the opened state shown in Fig. 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 inwardly along lower fold lines relative to the left outer panel 12, the front panel 14, the right outer panel 16 and the rear panel 18, respectively, and are fixed to each other in a substantially horizontal position.

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 that is bent inward along a pair of creases 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 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 that is bent inward along a pair of creases 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 part of the upper edge of the left side plate as a double-structure side plate.

The left bottom flap 224 is folded outward 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 outward 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.

As shown in FIG. 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 and right plates along the outer legs that extend approximately perpendicular to the upper and lower bases of the non-isosceles trapezoid.

The first tongues 241, 281 are folded inward 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 outward 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 outward 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 second tongue 282, the tip 2822 is folded outward 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.

The tip 2422 of one second tongue 242 is engaged at its tip edge by the side edge 2242 in one notch of the left bottom flap 224 and the side edge 2642 in one notch of the right bottom flap 264. Similarly, the tip 2822 of the other second tongue 282 is engaged at its tip edge by the side edge 2244 in the other notch of the left bottom flap 224 and the side edge 2644 in the other notch of the right bottom flap 264.

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 (or more precisely, the extension range A20, which is a part of it) via the vertical tongue pieces 2420, 2820 of the second tongue pieces 242, 282.

A vertical protrusion 142 extends from the portion of the upper edge of the front side panel 14 that is sandwiched between a pair of base end fold lines L0 in a generally vertical position independent of the base piece 240. Similarly, a vertical protrusion 142 extends from the portion of the upper edge of the rear side panel 14 that is sandwiched between a pair of base end fold lines L0 in a generally vertical position independent of the base piece 240.

(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 below. The packaging box may be assembled according to a procedure different from this example.

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 glued to the left end of the rear panel 18. This results in a blank that is roughly in the shape of a parallelogram 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.

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 cylindrical blank is deformed into an approximately rectangular cylindrical 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, i.e., in a state where the bottomed rectangular cylindrical storage section is not covered from above by the flaps 22, 24, 26, and 28, or in an open state. In this state, items such as fruits and vegetables are stored in the storage section.

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

Similarly, the upper right connecting piece 162 is folded inward along the crease line 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 in a substantially vertical position, 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.

Figure 3B shows the left and right side panels configured as double-layered side panels, with the left bottom flap 224 and the right bottom flap 264 each abutting against the bottom of the storage section in a substantially horizontal position.

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 relative to the rear side panel 18 and is in a substantially vertical position.

Next, as shown in Figures 4B and 5B, the base piece 280 is folded inward relative to the rear panel 18 along the base 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. Figure 3C shows the packaging box in this state.

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.

Then, the base of the second tongue 282 is brought closer to the inside of the rear 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 Figures 4C and 5C, the base of the second tongue 282 abuts against the inside of the rear 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.

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

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

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 Figures 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 each of the left bottom flap 224 and the right bottom flap 264 are substantially the same.

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

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).

Through this series of steps, an unopened packaging box like that shown in Figure 2 is completed.

(Functions of packaging boxes)
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 side panel 14 and the rear side 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 side panel and the right side panel. In addition, the base pieces 240, 280 are supported at the other end edges 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 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.

In addition, the top left connecting piece 122 and top right connecting piece 162 extend along part of the upper edges of the left and right side panels of one packaging box in a substantially horizontal position, and 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.

Furthermore, the pair of vertical protruding pieces 142, 182 of one packaging box prevents the pair of side panels (front panel 14 and rear panel 18) that constitute the storage section of another packaging box stacked on top of the first 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.

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

Other Embodiments of the 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 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 shape or a bottomed N-sided tubular shape (N is an integer of 5 or more).

In the above embodiment, the base pieces 240, 280, which are bent inwardly along the base fold line L0 relative to each of the pair of side panels 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 portion A20 of the first extension range A1 and the second extension range A2 (see Figures 4C and 5C). However, in another embodiment, at least one base piece 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 Figure 4C). In this case, at least one second tongue piece 242, 282 may not have a vertical tongue piece 2420, 2820.

In the above embodiment, the second tongues 242, 282 are bent inward relative to the first tongues 241, 281 and abut the bottom of the storage section at the tip 2422, 2822, and abut the side plates 14, 18 at the base (see Figures 4C and 5C). However, in another embodiment, at least one of the second tongues 242, 282 that is bent inward relative to the first tongues 241, 281 and abuts the bottom of the storage section at the tip 2422, 2822 may be spaced apart from the side plates 14, 18.

In the above embodiment, the tip 2422, 2822 of the second tongue 242, 282 is bent outward from the base at the intermediate fold line L4 and abuts against the bottom of the storage section (see Figures 4C and 5C), but in other embodiments, the tip edge of the second tongue 242, 282, which remains substantially flat, may abut against the bottom of the storage section.

In the above embodiment, the left and right side panels are configured as double-layered side panels made up of outer panels 12, 16 and inner panels 222, 262 that are bent inwardly to overlap the outer panels 12, 16 on the inside. However, in other embodiments, at least one of the side panels may be configured as a single-layered side panel made up of only the outer panels 12, 16.

In the above embodiment, when the bottom flaps 224, 264 are folded against the inner plates 222, 262 constituting the double-structure side plates, 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 Figures 4C and 5C). 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.

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.

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 have N independent base pieces 240, 280 (N is a positive number of 3 or more) 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.

In the above embodiment, at least one of the vertical protruding pieces 142, 182 may be omitted.

11. connecting piece, 12. left outer plate, 14. front plate, 16. left outer plate, 18. rear plate, 22. upper left flap, 24. front upper flap, 26. upper right flap, 28. upper rear flap, 42. lower left flap, 44. lower front flap, 46. lower right flap, 48. lower rear flap, 122. upper left connecting piece, 142. vertical protruding piece, 162. upper right 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, 262. right inner plate, 264. left bottom flap 280: base piece, 281: first tongue piece, 282: second tongue piece, 2242: one side edge of the left bottom flap, 2244: the other side edge of the left bottom flap, 2420: vertical tongue piece, 2422: tip of the second tongue piece, 2642: one side edge of the right bottom flap, 2644: the other side edge of the right bottom flap, 2820: vertical tongue piece, 2822: tip of the second tongue piece, A1: first extension region, A2: second extension region, A20: part of the second extension region, L0: base fold line, L1: first fold line, L2: second fold line, L4: intermediate fold line.

Claims (7)

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,
A packaging box characterized in that the base piece, which is folded inwardly along the base fold line for each of the pair of side panels and extends in a horizontal position at a diagonal position of the storage section, 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 the tip edge of the vertical tongue piece of the second tongue piece, which is folded along the second fold line relative to the first tongue piece in at least a portion of the second extension range . The packaging box according to claim 1,
The second tongue piece that is folded along the second fold line relative to the first tongue piece is in contact with the at least one side panel. The packaging box according to claim 1 or 2 ,
A packaging box characterized in that the tip of the second tongue abuts against the bottom of the storage section in a state where it is folded outward away from each of the pair of side panels via an intermediate fold line extending laterally relative to the base of the second tongue. 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;
A packaging box characterized in that the bottom flap is folded along the fold line against the inner panel that constitutes the double-structure side panel so as to fit along the bottom of the storage section, and the tip of the second tongue is engaged with the side edge of the bottom flap. 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,
A packaging box characterized in that the inner panel and the outer panel form a double-structure side panel when folded along the pair of crease lines relative to the upper connecting piece, and the upper connecting piece extends in a horizontal position along the upper edge of the other side panel. 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. The packaging box according to any one of claims 1 to 6 ,
a vertical protruding piece connected to each of the pair of side panels at an upper edge of each of the pair of side panels at a point different from the base end fold line and extending vertically independent of the base piece,

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