Packing box

Abstract

To provide a packaging box that can reduce entry of foreign matters into the packaging box and can be surely assembled.SOLUTION: A packaging box 1 is of a rectangular parallelepiped wrap-around case type. A left inner flap 71 has: a swing tongue piece 71a provided so as to be interposed between distal end edges of a pair of outer flaps 8 at a central part of a distal end part in a width direction of the left inner flap, protruding in a direction away from a proximal end of the left inner flap 71, and overlapping a right inner flap 72; and shortened portions 71b provided on both sides of the swing tongue piece 71a of the distal end part and provided so that a distal end edge of the left inner flap 71 and a distal end edge of the right inner flap 72 face each other. The swing tongue piece 71a has a swing fold line c3 provided at a proximal; end thereof and extending along a proximal end edge of the left inner flap 71 at a position on a proximal end side of the left inner flap 71 from a distal end of the right inner flap 72.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] Conventionally, a rectangular parallelepiped wraparound case type packaging box capable of accommodating a plurality of products has been known (see Patent Document 1).

[0003] This packaging box has a rectangular tube-shaped body portion extending in the horizontal direction and a pair of closing portions for closing the open ends of the body portion respectively. This body portion is assembled by sequentially folding a top plate, a bottom plate, and a pair of side plates connected via body fold lines at the body fold lines, and the closing portion is formed by folding a pair of inner flaps respectively connected to the pair of side plates and a pair of outer flaps respectively connected to the top plate and the bottom plate all inward at the inner flap fold lines and the outer flap fold lines, and fixing the outer flaps to the outer surface of the inner flaps with an adhesive.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, this packaging box has a problem that if there are gaps between the pair of inner flaps and between the pair of outer flaps in the assembled state, there is a risk that foreign matter may enter through these gaps.

[0006] One possible solution to this problem is to butt the leading edges of the opposing flaps together to eliminate the gap. However, because there is always some error in the position where the corrugated cardboard is folded, maintaining the precision required to butt the leading edges of the opposing flaps together without any gaps in mass-produced packaging boxes is not easy.

[0007] On the other hand, one possible solution to the problem is to overlap the tips of the opposing flaps. However, overlapping the flaps creates a step, which presents a new problem: the inner and outer flaps cannot be sufficiently pressed together with adhesive, resulting in weaker fixation.

[0008] This invention was made to solve these problems and aims to provide a packaging box that can reduce the inclusion of foreign matter inside the packaging box and can be assembled reliably. [Means for solving the problem]

[0009] To achieve this objective, the present invention provides a packaging box having a rectangular cylindrical body and a pair of closing parts that close the open ends of the body, The body is constructed by connecting a top plate, a bottom plate, and a pair of side plates via a fold line in the body. The closing portion has a pair of inner flaps and a pair of outer flaps. Each of the inner flaps is connected to the side plate, and the tip of one inner flap overlaps the other inner flap. The outer flaps are connected to the top plate and the bottom plate, respectively, with their leading edges facing each other at a predetermined distance apart, and are fixed to the outer surface of the inner flaps. The aforementioned inner flap is provided so as to be sandwiched between the tip edges of a pair of outer flaps at the center of its tip in the width direction, and has a swinging tongue that protrudes away from the base end of the one inner flap and overlaps the other inner flap, and shortened portions provided on both sides of the swinging tongue at its tip, such that the tip edge of the one inner flap faces the tip edge of the other inner flap, The pivoting tongue is provided at its base end and has a pivoting fold line that extends along the base edge of the one inner flap at a position closer to the base end of the one inner flap than the tip of the other inner flap.

[0010] In the packaging box of the present invention, the leading edges of a pair of outer flaps face each other with a predetermined distance between them, and the swinging tab of one inner flap is provided so as to be sandwiched between the leading edges of the outer flap and overlapping the other inner flap.

[0011] Therefore, according to the packaging box of the present invention, in the gap between the leading edges of a pair of outer flaps, the swinging tongue provided at the tip of one inner flap overlaps with the other inner flap, thereby reducing the gap that allows communication from the outside to the inside of the packaging box, and thus suppressing the intrusion of foreign matter into the inside of the packaging box.

[0012] Furthermore, in the packaging box of the present invention, the pivoting tongue of one inner flap overlaps the other inner flap, but its base end has a pivoting fold line that extends along the base edge of the one inner flap at a position closer to the base end of the one inner flap than the tip of the other inner flap. Therefore, when the upper inner flap is pushed in so that it is parallel to the other inner flap, the pivoting tongue, which is the overlapping part of the two, is folded along the pivoting fold line.

[0013] Furthermore, in the packaging box of the present invention, both sides of the swinging tongue of one inner flap in the width direction are the parts that the outer flap overlaps from the outside, but since this part is shortened, the inner flaps do not overlap each other. In other words, when one inner flap (excluding the swinging tongue) and the other inner flap are folded inward into the packaging box, a step is unlikely to occur between them. On the other hand, since the swinging tongue is positioned in the gap between the pair of outer flaps, even if a step is created in that part, it does not hinder the bonding when the inner flaps and outer flaps are pressed together with adhesive.

[0014] Therefore, with the packaging box of the present invention, the inner flap and the outer flap can be sufficiently pressed together with adhesive, ensuring reliable assembly.

[0015] In the packaging box of the present invention, the swinging tongue is superimposed on the outer surface of the other inner flap, Preferably, the tip of the outer flap has a retaining portion that protrudes away from the base end of the outer flap and overlaps with a part of the outer surface of the swinging tongue.

[0016] In a packaging box with this configuration, when one of the upper inner flaps is pushed in parallel to the other inner flap, the swinging tab is folded along the swinging fold line and protrudes outward from the packaging box. However, with a packaging box having this configuration, the swinging tab can be held in place from the outside by a retaining part, thus preventing the swinging tab from curling up during transport or other situations.

[0017] Furthermore, since this retaining portion only overlaps a part of the oscillating tongue that forms a step, it does not significantly hinder the adhesion between the inner and outer flaps, thus ensuring reliable assembly when using a packaging box with this configuration.

[0018] Furthermore, in a packaging box having a retaining portion, it is preferable that the retaining portion overlaps the outer surface of the swinging tongue piece on the swinging fold line side from the middle portion of the swinging tongue piece in the protruding direction.

[0019] In the packaging box having this configuration, the holding portion only holds the base end side of the swinging tongue piece. Since the swinging tongue piece is valley-folded along the swinging fold line at its base end, the step on the base end side is smaller than that with the other flap. That is, the holding portion of this outer flap only holds the portion with a small step among the swinging tongue pieces, so it hardly hinders the adhesion between the inner flap and the outer flap. Therefore, according to the packaging box having this configuration, assembly can be surely performed.

Brief Description of the Drawings

[0020] [Figure 1] It is a perspective view showing the appearance of the packaging box according to this embodiment. [Figure 2] It is a plan view showing the configuration of the packaging box according to this embodiment before assembly. [Figure 3] It is a perspective view for explaining the process of assembling the packaging box according to this embodiment.

Mode for Carrying Out the Invention

[0021] Hereinafter, referring to FIGS. 1 to 3, a packaging box 1 according to one embodiment of the present invention (hereinafter simply referred to as “this embodiment”) will be described. As shown in FIG. 1, the packaging box 1 of this embodiment is of a wrap-around case type having a rectangular parallelepiped appearance.

[0022] The packaging box 1 has a rectangular tube-shaped body portion 2 extending in the horizontal direction and a closing portion 3 for closing the open end of the body portion 2. The packaging box 1 of this embodiment is formed in a vertically long shape where the height (the length in the vertical direction) is longer than the width (the length in the horizontal direction) when viewed from the closing portion 2 side.

[0023] The body section 2 comprises a top plate 4, a bottom plate 5, and a pair of side plates 6. The closing section 3 comprises an inner flap 7 and a pair of outer flaps 8. The pair of inner flaps 7 include a left inner flap 71 (corresponding to "one inner flap" of the present invention) connected to the rear (left) side plate 6 in Figure 1, and a right inner flap 72 (corresponding to "the other inner flap" of the present invention) connected to the front (right) side plate 6. In Figure 1, the tip of the left inner flap 71 overlaps the outer surface of the right inner flap 72.

[0024] The pair of outer flaps 8 includes an upper outer flap 81 connected to the top plate 4 and a lower outer flap 82 connected to the bottom plate 5. The leading edge of the upper outer flap 81 and the leading edge of the lower outer flap 82 face each other with a predetermined distance between them. The upper outer flap 81 and the lower outer flap 82 are fixed to the outer surfaces of the inner flaps 8 (left inner flap 71 and right inner flap 72) respectively via adhesive.

[0025] The packaging box 1 is formed by punching out a roughly rectangular corrugated cardboard sheet 1x, as shown in Figure 2, from a base paper, and then folding and assembling it. The structure of the corrugated cardboard sheet 1x will be described below with reference to Figure 2.

[0026] As shown in Figure 2, the corrugated cardboard sheet 1x is connected from right to left in the following order: side plate 6, bottom plate 5, side plate 6, top plate 4, and adhesive piece 9, each connected via a fold line a on the body. The top plate 4, bottom plate 5, and side plates 6 are all formed in a roughly rectangular shape, and the adhesive piece 9 is formed in a roughly inverted trapezoidal shape.

[0027] The top panel 4 has upper outer flaps 81 connected to its upper and lower ends via upper outer flap fold lines b1. Each of the upper outer flaps 81 is formed in a roughly L-shape.

[0028] At the tip of the upper outer flap 81, a roughly rectangular retaining portion 81a is formed from the center in the width direction to the right. The retaining portion 81a protrudes in a direction away from the base end (upper outer flap fold line b1) of the upper outer flap 81.

[0029] The length of the upper outer flap 81 from its base to its tip in the portion where the retaining portion 81a is formed is designed to be greater than the length from the left edge of the left inner flap 71 to the left edge of the adjacent oscillating tongue piece 71a, which will be described later. On the other hand, the length of the upper outer flap 81 from its base to its tip in the portion where the retaining portion 81a is not formed at its tip is designed to be less than the length from the left edge of the left inner flap 71 to the left edge of the adjacent oscillating tongue piece 71a.

[0030] The bottom plate 5 has lower outer flaps 82 connected to its upper and lower ends via lower outer flap fold lines b2. Both lower outer flaps 82 are formed in a roughly L-shape.

[0031] A roughly rectangular retaining portion 82a is formed at the tip of the lower outer flap 82, extending from the center in the width direction to the left. The retaining portion 82a protrudes away from the base end (lower outer flap fold line b2) of the lower outer flap 82.

[0032] The length of the lower outer flap 82 from its base to its tip in the portion where the retaining portion 82a is formed is designed to be greater than the length from the right edge of the left inner flap 71 to the right edge of the adjacent oscillating tongue piece 71a. On the other hand, the length of the lower outer flap 82 from its base to its tip in the portion where the retaining portion 82a is not formed at its tip is designed to be less than the length from the right edge of the left inner flap 71 to the right edge of the adjacent oscillating tongue piece 71a.

[0033] The combined length of the upper outer flap 81 (the portion where the retaining portion 81a is formed) and the lower outer flap 82 (the portion where the retaining portion 82a is formed) is designed to be smaller than the widthwise length (left-right direction in Figure 2) of each inner flap 7 (left inner flap 71 and right inner flap 72).

[0034] In Figure 2, the left side plate 6 has left inner flaps 71 connected to its upper and lower ends via an inner flap fold line c1. The left inner flap 71 is formed in a substantially convex shape. At the tip of the left inner flap 71, a pivoting tongue piece 71a is formed, which protrudes in the center in the width direction away from the base end (inner flap fold line c1) of the left outer flap.

[0035] Furthermore, shortened portions 71b are formed on both sides of the pivoting tongue 71a at the tip of the left inner flap 71. The shortened portions 71b are designed to be shorter in the vertical direction than the pivoting tongue 71a.

[0036] Furthermore, a pair of slits 71c extending towards the base end are formed at the tip of the left inner flap 71, along the side edge of the pivoting tongue piece 71a. In addition, a pivoting fold line c3 is formed at the tip of the left inner flap 71, connecting the tips of the pair of slits 71c.

[0037] The pivoting tongue 71a is configured to pivot relative to the left inner flap 71, with the pivoting fold line c3 as the axis of rotation, by means of a pair of slits 71c and a pivoting fold line c3.

[0038] The right side panel 6 has roughly rectangular right inner flaps 72 connected to its upper and lower ends via inner flap fold lines c2.

[0039] The sum of the lengths from the base to the tip of the left inner flap 71 and the right inner flap 72 in the portion where the oscillating tongue 71a is formed is designed to be greater than the widthwise length of the outer flap 8 (upper outer flap 81 and lower outer flap 82). On the other hand, the sum of the lengths from the base to the tip of the left inner flap 71 and the right inner flap 72 in the portion where the shortened portion 71b is formed is designed to be the same as or slightly smaller than the widthwise length of the outer flap 8 (upper outer flap 81 and lower outer flap 82).

[0040] The length from the right edge of the upper outer flap 81 to the left edge of the retaining portion 81a is greater than the length from the base end (inner flap fold line c1) of the left inner flap 71 to the swing fold line c3, and is designed to be the same as or slightly smaller than the length from the base end (inner flap fold line c1) of the left inner flap 71 to the tip edge of the shortened portion 71b.

[0041] Similarly, the length from the left edge of the lower outer flap 82 to the right edge of the retaining portion 82a is greater than the length from the base end (inner flap fold line c1) of the left inner flap 71 to the swing fold line c3, and is designed to be the same as or slightly smaller than the length from the base end (inner flap fold line c1) of the left inner flap 71 to the tip edge of the shortened portion 71b.

[0042] In this embodiment, the extension line of the tip edge of the shortened portion 71b and the imaginary line drawn at an intermediate position between the tip of the oscillating tongue piece 71a and the oscillating fold line c3 generally coincide.

[0043] An H-shaped fracture initiation section 61 is formed in the center of the side plate 6. Cut tape is applied from the left-right center of the fracture initiation section 61 to the widthwise center of the tip of each inner flap 7 (not shown).

[0044] Next, we will explain the procedure for assembling the packaging box 1 shown in Figure 1 from the corrugated cardboard sheet 1x shown in Figure 2.

[0045] First, a worker places a sheet of corrugated cardboard 1x on, for example, a table (not shown), and then places multiple products (not shown) on a base plate 5 in an orderly fashion.

[0046] Next, in Figure 2, the side plate 6, located to the right of the base plate 5, is folded along the fold line a on the body and stands upright at a right angle to the base plate 5. Then, adhesive is applied to the outer surface of the upper end of the upright right side plate 6.

[0047] Next, by sequentially folding along the fold line a located on the left side of the base plate 5, the left side plate 6 is raised perpendicular to the base plate 5, the top plate 4 is made parallel to the base plate 5, and the adhesive piece 9 hangs down. Then, the inner surface of the adhesive piece 9 is fixed to the outer surface of the right side plate 6 via adhesive, thereby assembling the body 2.

[0048] Next, as shown in Figure 3, the right inner flap 72 is folded perpendicular to the side plate 6 toward the inside of the body 2 along the inner flap fold line c2.

[0049] Next, the left inner flap 71 is folded inward toward the body 2 at the inner flap fold line c1, at a right angle to the side plate 6.

[0050] At this time, the sum of the length from the base to the tip of the left inner flap 71 and the length from the base to the tip of the right inner flap 72 in the portion where the oscillating tongue 71a is formed is greater than the widthwise length of the outer flap 8. Therefore, the oscillating tongue 71a of the left inner flap 71 overlaps the outer surface of the right inner flap 72.

[0051] On the other hand, the sum of the length from the base end to the tip of the left inner flap 71 and the length from the base end to the tip of the right inner flap 72 in the portion where the shortened portion 71b is formed is equal to or less than the widthwise length of the outer flap 8. Therefore, the shortened portion 71b of the left inner flap 71 does not overlap with the outer surface of the right inner flap 72.

[0052] Furthermore, in the left inner flap 71, the pivoting fold line c3 formed at the base end of the pivoting tongue 71a is located closer to the base end than the shortened portion 71b. Therefore, when the inner flaps 7 are folded inward into the packaging box, they are naturally positioned closer to the left inner flap 71 than the leading edge of the right inner flap 72. Consequently, when attempting to fold the left inner flap 71 perpendicular to the side plate 6, the pivoting tongue 71a, which is the overlapping portion of the inner flaps 7, is pushed relatively outward into the packaging box by the right inner flap 72 and folded along the pivoting fold line c3.

[0053] Next, adhesive is applied to the outer surfaces of the left inner flap 71 and the right inner flap 72, specifically to the side edges above the upper side edge of the oscillating tongue piece 71a and to the side edges below the lower side edge of the oscillating tongue piece 71a.

[0054] Next, as shown in Figure 3, the lower outer flap 82 is folded upward along the lower outer flap fold line b2, and the inner surface of the lower outer flap 82 is fixed to the outer surface of the inner flap 7 (left inner flap 71 and right inner flap 72) via adhesive.

[0055] In this case, the portion of the lower outer flap 82 in which the retaining portion 82a is not formed (to the right of the center in the width direction in Figure 3) does not overlap the outer surface of the oscillating tongue piece 71a because its vertical length is smaller than the length from the lower side edge of the left inner flap 71 to the side edge of the adjacent oscillating tongue piece 71a.

[0056] On the other hand, the portion of the lower outer flap 82 in which the retaining portion 82a is formed has a vertical length greater than the length from the lower side edge of the left inner flap 71 to the side edge of the adjacent swinging tongue piece 71a, and therefore overlaps with the outer surface of the swinging tongue piece 71a. More specifically, in Figure 3, the length from the left side edge of the lower outer flap 82 to the right side edge of the retaining portion 82a is greater than the length from the inner flap fold line c1 to the swinging fold line c3, and is designed to be the same as or slightly smaller than the length from the inner flap fold line c1 to the tip edge of the shortened portion 71b. Therefore, the retaining portion 82a of the lower outer flap 82 overlaps with a very small portion of the outer surface on the base end side of the swinging tongue piece 71a.

[0057] Next, as shown in Figure 1, the upper outer flap 81 is folded downward along the upper outer flap fold line b1, and the inner surface of the upper outer flap 81 is fixed to the outer surface of the inner flaps 7 (left inner flap 71 and right inner flap 72) via adhesive. At this time, the combined length of the upper outer flap 81 and the lower outer flap 82 is designed to be smaller than the widthwise length (up and down direction in Figures 1 and 3) of each inner flap 7, so that the leading edge of the upper outer flap 81 and the leading edge of the lower outer flap 82 face each other with a predetermined distance between them. As a result, the open end of the body 2 is closed, and the closed portion 3 is formed.

[0058] In this case, the portion of the upper outer flap 81 in which the retaining portion 81a is not formed (to the right of the center in the width direction in Figure 3) does not overlap the outer surface of the oscillating tongue 71a because its vertical length is smaller than the length from the upper side edge of the left inner flap 71 to the side edge of the adjacent oscillating tongue 71a. In other words, the oscillating tongue 71a is positioned to be sandwiched between the tip edge of the portion of the lower outer flap 82 in which the retaining portion 82a is not formed and the tip edge of the portion of the upper outer flap 81 in which the retaining portion 81a is not formed.

[0059] On the other hand, the portion of the upper outer flap 81 in which the retaining portion 81a is formed has a vertical length greater than the length from the upper side edge of the left inner flap 71 to the side edge of the adjacent swinging tongue piece 71a, and therefore overlaps with the outer surface of the swinging tongue piece 71a. More specifically, in Figure 1, the length from the left side edge of the upper outer flap 81 to the right side edge of the retaining portion 12a is greater than the length from the inner flap fold line c1 to the swinging fold line c3, and is designed to be the same as or slightly smaller than the length from the inner flap fold line c1 to the tip edge of the shortened portion 71b. Therefore, the retaining portion 81a of the upper outer flap 81 overlaps with a very small portion of the outer surface on the base end side of the swinging tongue piece 71a.

[0060] With the above steps completed, the assembly of the packaging box 1 containing the product is finished, and the packaging box 1 in the state shown in Figure 1 is completed.

[0061] Next, the operation and effects of the packaging box 1 of this embodiment will be explained with reference to Figures 1 and 3.

[0062] In the packaging box 1 of this embodiment, the leading edge of the upper outer flap 81 and the leading edge of the lower outer flap 82 face each other with a predetermined distance between them, and the swinging tongue 71a is superimposed on the outer surface of the right inner flap 72 at a position sandwiched between the leading edge of the lower outer flap 82 (the portion where the retaining portion 82a is not formed) and the leading edge of the upper outer flap 81 (the portion where the retaining portion 81a is not formed).

[0063] In other words, in packaging box 1, the gaps at the edges of both ends of the upper outer flap 81 and the lower outer flap 82 can be filled by the swinging tongue piece 71a that overlaps the outer surface of the right inner flap 72.

[0064] Therefore, according to the packaging box 1 of this embodiment, the gap that communicates from the outside to the inside and occurs in the central part of the closure 2 can be reduced, thereby suppressing the intrusion of foreign matter into the packaging box 1.

[0065] Conversely, in the packaging box 1 of this embodiment, the oscillating tongue 71a can fill the gaps at both ends of the upper outer flap 81 and the lower outer flap 82. Therefore, even if the closing portion 3 has a vertically elongated shape, it is not necessary to make the upper outer flap 81 and the lower outer flap 82 longer and butt together, and they can be made shorter. Thus, according to the packaging box 1 of this embodiment, the area of ​​the corrugated cardboard 1x can be reduced.

[0066] Incidentally, in the closing section 3 of the packaging box 1, the portion of the left inner flap 71 with the swinging tongue 71a overlaps with the right inner flap 72, so it appears that a step is created between the left inner flap 71 and the right inner flap 72. However, in the packaging box 1, the shortened portion 71b of the left inner flap 71 is short and does not overlap with the outer surface of the right inner flap 72. Furthermore, when attempting to fold the left inner flap 71 perpendicular to the side plate 6, the swinging tongue 71a is folded along the swinging fold line c3 and pushed relatively outward from the packaging box. As a result, the leading edge of the shortened portion 71b and the leading edge of the right inner flap 72 can abut or face each other with a predetermined distance between them, and most of the left inner flap 71 excluding the swinging tongue 71a and the right inner flap 72 can be folded flat without creating a step.

[0067] Furthermore, in the packaging box 1, since most of the upper outer flap 81, excluding the retaining portion 81a, does not overlap with the swinging tongue 71a, it is adhered to most of the left inner flap 71 and the right inner flap 72, excluding the flatly folded swinging tongue 71a. The same applies to the lower outer flap 82, excluding the retaining portion 82a.

[0068] Therefore, with the packaging box 1 of this embodiment, the inner flap 7 and the outer flap 8 can be sufficiently pressed together with adhesive, ensuring reliable assembly.

[0069] Furthermore, in the packaging box 1, the retaining portion 81a of the upper outer flap 81 (and the retaining portion 82a of the lower outer flap 82) overlaps the outer surface of the swinging tongue 71a, thus preventing the swinging tongue 71a from being peeled back during transport or other situations.

[0070] Furthermore, in the packaging box 1, the retaining portion 81a of the upper outer flap 81 (and the retaining portion 82a of the lower outer flap 82) can only be superimposed on a very small portion of the outer surface on the base end side of the swinging tongue piece 71a.

[0071] More specifically, the oscillating tongue 71a is folded upwards with the oscillating fold line c3 at its base as the pivot axis. As the oscillating tongue 71a moves from its base towards its tip, it gradually separates from the coplane that includes most of the left inner flap 71 and the right inner flap 72. Therefore, the base end of the oscillating tongue 71a is not far from the coplane that includes most of the left inner flap 71 and the right inner flap 72, resulting in little to no step difference from this coplane.

[0072] Therefore, even if the left inner flap 71 creates a step between it and the right inner flap 72 at the portion of the oscillating tongue 71a, and the retaining portion 81a of the upper outer flap 81 (and the retaining portion 82a of the lower outer flap 82) come into contact with this step, it only comes into contact with a small portion of the area where the step is smallest. As a result, when the inner flap 7 and the outer flap 8 are pressed together with adhesive, this hardly hinders the adhesion between them.

[0073] Therefore, according to the packaging box 1 of this embodiment, the retaining portion 81a of the upper outer flap 81 (and the retaining portion 82a of the lower outer flap 82) prevents the swinging tongue 71a from being peeled back during transport, and the inner flap 7 and outer flap 8 can be sufficiently pressed together with adhesive, thus ensuring reliable assembly.

[0074] [Differentiation] In the above embodiment, corrugated cardboard was used as an example material, but the material may be cardboard or a thin synthetic resin sheet, as long as it can be folded and assembled and can be broken along the breakable line.

[0075] In the above embodiment, an example was described in which a pivoting tongue 71a is provided on the left inner flap 71, but there are no limitations on the left and right sides, and a pivoting tongue may also be provided on the right inner flap 72.

[0076] In the above embodiment, the example described was one in which the oscillating tongue 71a portion of the left inner flap 71 overlaps the outer surface of the right inner flap 72. However, the right inner flap 72 may also overlap the outer surface of the oscillating tongue 71a portion of the left inner flap 71.

[0077] In the above embodiment, adhesive was described as an example of a means of fixing, but staples or adhesive tape may also be used as means of fixing.

[0078] In the above embodiment, the upper outer flap 81 is formed in a substantially L-shape, but the upper outer flap 81 may be formed in a substantially convex shape, with only the center of the tip serving as the retaining portion 81a. Alternatively, the upper outer flap 81 may be formed in a substantially rectangular shape, and the length from the base to the entire tip may be designed to be greater than the length from the left edge of the left inner flap 71 to the left edge of the adjacent oscillating tongue piece 71a, thereby making the entire tip of the upper outer flap 81 the retaining portion 81a. Furthermore, the upper outer flap 81 may be formed in a substantially rectangular shape, and the length from the base to the entire tip may be designed to be the same as or smaller than the length from the left edge of the left inner flap 71 to the left edge of the adjacent oscillating tongue piece 71a, thereby omitting the retaining portion 81a. The same modifications apply to the lower outer flap 82 and the retaining portion 82a.

[0079] In the above embodiment, the pivoting tongue 71a was described as having a pair of slits 71c extending from the tip of the left inner flap 71 toward the base end. However, the slits 71c are optional, and for example, only the pivoting fold line c3 may be formed along the extension of the shortened portion 71b. Conversely, the slits 71c can be extended to the base end of the left inner flap 71 (inner flap fold line c1), so that the central part of the inner flap fold line c1 becomes the pivoting fold line c3.

[0080] Furthermore, the oscillating fold line c3 should be formed at a position where the sum of the length from the oscillating fold line c3 to the base end of the left inner flap 71 (inner flap fold line c1) and the length from the base end to the tip of the right inner flap 72 is equal to or less than the widthwise length of the outer flap 8 (upper outer flap 81 and lower outer flap 82). In summary, when the left inner flap 71 and the right inner flap 72 are folded inward into the packaging box 1, the oscillating fold line c3 needs to be positioned closer to the base end (inner flap fold line c1) of the left inner flap 71 than to the tip edge of the right inner flap 72. [Explanation of symbols]

[0081] 1 packaging box 2 Torso 3 Occlusion 4 Top plate 5 Bottom plate 6 Side panels 7. Inner flap 71 Left inner flap (one inner flap) 72 Right inner flap (other inner flap) 71a Oscillating tongue 71b Shortened section 8. Outer flap 81a, 81b Retaining part a. Fold line on the body c3 Oscillating fold line

Claims

1. A packaging box having a rectangular cylindrical body and a pair of closing parts that close the open ends of the body, The body is constructed by connecting a top plate, a bottom plate, and a pair of side plates via a fold line in the body. The closing portion has a pair of inner flaps and a pair of outer flaps. Each of the inner flaps is connected to the side plate, and the tip of one inner flap overlaps the other inner flap. The outer flaps are connected to the top plate and the bottom plate, respectively, with their leading edges facing each other at a predetermined distance apart, and are fixed to the outer surface of the inner flaps. The aforementioned inner flap is provided so as to be sandwiched between the tip edges of a pair of outer flaps at the center of its tip in the width direction, and has a swinging tongue that protrudes away from the base end of the one inner flap and overlaps the other inner flap, and shortened portions provided on both sides of the swinging tongue at its tip, such that the tip edge of the one inner flap faces the tip edge of the other inner flap, The packaging box is characterized in that the pivoting tongue is provided at its base end and has a pivoting fold line that extends along the base edge of one inner flap at a position closer to the base end of one inner flap than the tip of the other inner flap.

2. In the packaging box according to claim 1, The aforementioned swinging tongue is superimposed on the outer surface of the other inner flap, The packaging box is characterized in that the tip of the outer flap has a retaining portion that protrudes away from the base end of the outer flap and overlaps with a part of the outer surface of the swinging tongue.

3. In the packaging box according to claim 2, The packaging box is characterized in that the retaining portion overlaps the outer surface of the swinging tongue piece on the swinging fold line side from the middle portion of the swinging tongue piece in the protruding direction of the swinging tongue piece.

Images