Packaging box

Abstract

To provide a packaging box from which commodities can be laterally taking out, and in which the commodities can be stably stacked even when the commodities are heavy articles.SOLUTION: A packaging box 1 comprises a trunk part 2, a top part 3, and a bottom part 4. A substantially U-shaped breakable line 21a is provided at a central part of each of a pair of first side plates 11a, that constitutes the trunk part 2 to form a first window lid part 31a, and a substantially U-shaped breakable line 22a is provided at a central part of a pair of second side plates 12a to form a second window lid part 32a; and thus when the packaging box 1 is made to be in a window-opening state for a display, the breakable line 21a and the breakable line 22a are fractured; the first window lid part 31a and the second window lid part 32a are sequentially folded in a circumferential direction; and the first window lid part 31a and the second window lid part 32a can be maintained in an attitude of being overlapped to the top part 3 by being engaged with each other on an upper face of the top part 3.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a packaging box that can take out internal products from the side in a stacked state.

Background Art

[0002] Conventionally, a packaging box is known in which a substantially upper half is separated from a citrus box-shaped box body and a tray is formed in the lower half.

[0003] In such a packaging box, in order to display the stored items as products, when a cutting tape is pulled outside the box body to cut the box body and the side panel, the upper part of the end panel, and the upper flap are integrally removed, only the bottom wall of the box body and the lower parts of the side panel and the end panel that stand up from this remain, and there is nothing on top of the stored items. For this reason, there was a drawback that another box body could not be placed on it in the display state during display.

[0004] Therefore, the applicant of the present application proposed a packaging box that can be unpacked in a tray shape so that the products stored inside can be taken out from the side in a stacked state (see Patent Document 1).

[0005] The packaging box described in Patent Document 1 includes a bottom plate, a body portion formed in a rectangular tube shape by front, rear, left, and right side walls standing up from the periphery of the bottom plate, a pair of first flaps connected to the upper edges of a pair of first side wall portions facing one side of the body portion via fold lines and horizontally bent inward, and a pair of second flaps connected to the upper edges of a pair of second side wall portions facing the other side of the body portion via fold lines and horizontally bent inward to overlap inside or outside each first flap. A first breakable line that connects both side edges of each first flap, curves into the first side wall portion side across the middle portion of the first fold line, and defines at least a part of the contour lines of the first side plate and the first tongue piece, and both side edges of each second flap are connected, and across the middle portion of the second fold line, curves into the second side wall portion side, and a second breakable line that defines at least a part of the contour lines of the second side plate and the second tongue piece.

[0006] When forming a tray from this packaging box, the first side wall portion, the second side wall portion, and the first and second flaps at the top can be broken along the first breakable line and the second breakable line and removed from the packaging box to form the tray. Also, by overlapping the remaining portions of the first and second flaps, placement portions can be provided at the four corners on the top surface side.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] However, in the case of the packaging box described in Patent Document 1, since the load of the upper tray has to be supported by the placement portions at the four corners, when the stored items are lightweight, another tray can be stacked on top without problems, but when the stored items are medium or heavy, there is a problem that they cannot be supported.

[0009] Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide a packaging box that can be stably stacked regardless of the weight of the product.

Means for Solving the Problems

[0010] The packaging box of the present invention has a rectangular tube-shaped body portion that extends in the vertical direction and is formed by a plurality of side plates, a bottom portion that seals the lower end opening of the body portion, a top portion that seals the upper end opening of the body portion, a window fold line provided at an intermediate portion of the upper edge of the side plate, a breakable line that connects both ends of the window fold line and extends downward in a convex shape, a window lid portion that is a region surrounded by the breakable line and the window fold line, and a locking portion provided on the window lid portion that maintains the window lid portion in a posture where it is broken along the breakable line, folded back along the window fold line, and superposed on the top portion (hereinafter referred to as "the packaging box of the first aspect of the present invention").

[0011] In the packaging box of the first aspect of the present invention, the window lid portion can be broken along the breakable line, folded back along the window fold line, and superposed on the top portion, and can be maintained in the folded-back posture by the locking portion. Therefore, in the packaging box of the first aspect of the present invention, the product stored inside can be taken out from the side plate where the window portion is formed by folding back the window lid portion. Further, in the packaging box of the first aspect of the present invention, since another packaging box can be stacked on the top portion where the window lid portions are folded, even if the product is a medium-sized or heavy item, it is possible to prevent the upper packaging box from shifting horizontally and falling into the lower packaging box.

[0012] Therefore, according to the packaging box of the first aspect of the present invention, it is possible to stack stably regardless of the weight of the stored product.

[0013] In the packaging box of the first aspect of the present invention, it is preferable that the window lid portions are respectively provided on two or more side plates, and the locking portion locks one window lid portion and another window lid portion to each other (hereinafter referred to as "the packaging box of the second aspect of the present invention").

[0014] In the packaging box of the second aspect of the present invention, since window lid portions are respectively provided on two or more side plates, a plurality of window portions can be formed by breaking these, improving the display effect of the product stored inside and facilitating the taking out of the product. Further, since the locking portion can lock one window lid portion and another window lid portion to each other, the operation of opening the packaging box is easy.

[0015] Therefore, in the packaging box of the second aspect of the present invention, the broken window lid portion can be stopped with an easy operation, and it is possible to stack stably regardless of the weight of the stored product.

[0016] In the packaging box of the first aspect of the present invention, the window lid portions are provided on each of the plurality of side plates, the locking portions are provided on both side portions of the window lid portions, and by sequentially folding back the plurality of window lid portions in the circumferential direction, the lower surface of the locking portion of the window lid portion adjacent in the circumferential direction is superposed on the upper surface of the locking portion of one of the window lid portions, and finally, the laminated region of the locking portion of the window lid portion that is folded back first and faces the lower surface of the locking portion of the window lid portion that is folded back last is pulled out to the upper surface side of the window lid portion that is folded back last, so that they are preferably locked to each other (hereinafter referred to as "the packaging box of the third aspect of the present invention").

[0017] In the packaging box of the third aspect of the present invention, when a plurality of window lid portions are superposed on the top portion, they can be locked to each other by sequentially folding them back in the circumferential direction to form a locked state.

[0018] Therefore, according to the packaging box of the third aspect of the present invention, the broken window lid portion can be stopped by an easy operation, and it can be stably stacked regardless of the weight of the stored product.

[0019] In the packaging boxes of the first to third aspects of the present invention, the body portion has a pair of first side plates facing each other and a pair of second side plates facing each other in a direction different from the direction in which the first side plates face each other. An inner flap is continuously provided on each first side plate at its upper end edge via an inner flap fold line, and an outer flap is continuously provided on each second side plate at its upper end edge via an outer flap fold line. The top portion is formed by superposing both outer flaps that are horizontally bent so that their leading edges face each other on the upper surfaces of both inner flaps that are horizontally bent so that their leading edges face each other, and attaching an adhesive tape of a predetermined width along the butting portion where the leading edges of both outer flaps are butted against each other. It is preferable that the outer flap is provided with a tongue piece fold line extending along the outer flap fold line inside the opposing region where the leading edges of the pair of inner flaps face each other in a plan view, and a tongue piece breakable line that connects both ends of the tongue piece fold line and bulges and extends away from the tongue piece fold line and to the outside of the opposing region (hereinafter referred to as "the packaging box of the fourth aspect of the present invention").

[0020] In the packaging box of the fourth aspect of the present invention, the top is closed by fixing the leading edges of both outer flaps with an adhesive tape, and the outer flap and the inner flap are not adhered to each other. Therefore, when the window lid portion of the first side plate is broken along the breakable line and folded back along the window fold line and superposed on the top, since the window fold line is a part of the inner flap fold line, the inner flap connected to the window lid portion may fall into the packaging box due to its elastic force.

[0021] However, in the packaging box of the fourth aspect of the present invention, since a locking tongue piece is formed on the outer flap, when the window lid portions of a pair of first side plates are folded back and superposed on the top, the edge of the inner flap can be locked by the locking tongue piece.

[0022] Therefore, according to the packaging box of the fourth aspect of the present invention, since it is possible to prevent the inner flap from falling into the packaging box, it is easy to take out the product stored inside.

[0023] Further, in the packaging box of the fourth aspect of the present invention, it is preferable that an auxiliary fold line connecting the tongue piece breakable line is provided on the outer flap inside the facing region in a plan view (hereinafter referred to as "the packaging box of the fifth aspect of the present invention").

[0024] In the packaging box of the fifth aspect of the present invention, since an auxiliary fold line is provided on the locking tongue piece, it is easy to prevent the inner flap from falling by once bending the side end of the locking tongue piece, hanging the locking tongue piece below the inner flap, and then folding it back.

Brief Description of the Drawings

[0025]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Embodiments for Carrying Out the Invention

[0026] Hereinafter, with reference to Figs. 1 to 7, a packaging box 1 according to one embodiment of the present invention (hereinafter, simply referred to as "the present embodiment") will be described.

[0027] The packaging box 1 of the present embodiment is a packaging box for storing goods. That is, as shown in the assembled state in Fig. 1, the packaging box 1 is formed in a rectangular parallelepiped shape by a rectangular tube-shaped body portion 2, a top portion 3 that closes the upper end of the body portion 2, and a bottom portion 4 that closes the lower end of the body portion 2.

[0028] As shown in the unfolded view in Fig. 2, the packaging box 1 is formed from a single sheet of cardboard 1X made of corrugated paper in a substantially rectangular shape. Note that Fig. 2 shows the back side of the corrugated cardboard 1X. The corrugated cardboard 1X includes a first side plate 11a at the right end, a second side plate 12a connected to the left edge of the first side plate 11a via a body fold line a, a first side plate 11b connected to the left edge of the second side plate 12a via a body fold line b, a second side plate 12b connected to the left edge of the first side plate 11b via a body fold line c, and an adhesive piece 13 connected to the left edge of the second side plate 12b via a body fold line d.

[0029] The first side plate 11a has an upper inner flap 14a connected to its upper edge via an upper inner flap fold line e and a lower inner flap 15a connected to its lower edge via a lower inner flap fold line f. The first side plate 11b has an upper inner flap 14b connected to its upper edge via an upper inner flap fold line e and a lower inner flap 15b connected to its lower edge via a lower inner flap fold line f. The second side plate 12a has an upper outer flap 16a connected to its upper edge via an upper outer flap fold line g and a lower outer flap 17a connected to its lower edge via a lower outer flap fold line h. The second side plate 12b has an upper outer flap 16b connected to its upper edge via an upper outer flap fold line g and a lower outer flap 17b connected to its lower edge via a lower outer flap fold line h.

[0030] The upper inner flaps 14a, 14b and the upper outer flaps 16a, 16b constitute the top portion 3, and the lower inner flaps 15a, 15b and the lower outer flaps 17a, 17b constitute the bottom portion 4.

[0031] As shown in Figs. 1 and 2, substantially U-shaped perforation lines (score lines) 21a and 21b are provided at the central portions of each of the pair of first side plates 11a and 11b. Each end of the perforation lines 21a and 21b contacts the upper edge of the first side plates 11a and 11b at an intermediate portion having a predetermined interval from the left and right ends of the upper edge, and the entire perforation lines 21a and 21b also have a predetermined interval from the left and right side edges so as not to contact the left and right side edges of the first side plates 11a and 11b.

[0032] Incidentally, the above-described upper inner flap fold line e is formed along the upper edge of the first side plates 11a and 11b, and a region sandwiched between the ends of the breakable lines 21a and 21b is defined as a window fold line e1. Further, a region surrounded by the breakable lines 21a and 21b and the window fold line e1 is defined as first window lid portions 31a and 31b. Further, both side portions of each of the first window lid portions 31a and 31b are defined as locking portions 31c.

[0033] Also, as shown in FIGS. 1 and 2, substantially U-shaped breakable lines (perforations) 22a and 22b are provided at the central portions of the pair of second side plates 12a and 12b. Each end of the breakable lines 22a and 22b contacts an intermediate portion having a predetermined interval from the left and right ends of the upper edge with respect to the upper edge of the second side plate 12, and the entire breakable lines 22a and 22b also have a predetermined interval from the left and right side edges so as not to contact the left and right side edges of the second side plates 12a and 12b.

[0034] Incidentally, the above-described fold line g is formed along the upper edge of the second side plates 12a and 12b, and a region sandwiched between the ends of the breakable lines 22a and 22b is defined as a window fold line g1. Further, a region surrounded by the breakable lines 22a and 22b and the window fold line g1 window fold line g1 is defined as second window lid portions 32a and 32b. Further, both side portions of each of the second window lid portions 32a and 32b are defined as locking portions 32c.

[0035] Finger insertion portions 23 are respectively provided on the breakable lines 21a, 21b, 22a, and 22b.

[0036] The finger insertion portion 23 includes a cut 23a extending upward from the center of the bottom of the breakable lines 21a, 21b, 22a, and 22b, a fold line 23b extending from the cut 23a substantially parallel to the breakable lines 21a, 21b, 22a, and 22b in the left and right directions, a pair of cuts 23c extending from the tip of each fold line 23b to the breakable lines 21a, 21b, 22a, and 22b, and a region sandwiched between the pair of cuts 23c among the breakable lines 21a, 21b, 22a, and 22b.

[0037] On the upper outer flaps 16a and 16b, when viewed in plan view in FIG. 1, a pair of tongue-fold lines i extending parallel to the fold line g of the outer flap inside the opposing region where the leading edges of the pair of upper inner flaps 14a and 14b face each other (a position not overlapping the upper inner flaps 14a and 14b in plan view), a tongue-piece breakable line j connecting both ends outside the pair of tongue-fold lines i and bulging and extending in a direction away from the tongue-fold line i and to the outside of the opposing region (a position overlapping the upper inner flaps 14a and 14b in plan view), and a U-shaped cut k connecting the pair of tongue-fold lines i are provided.

[0038] The region surrounded by the tongue-fold line i, the tongue-piece breakable line j, and the cut k is formed as locking tongue pieces 41a and 41b that can be bent inwardly of the packaging box 1. Further, on the locking tongue pieces 41a and 41b, a pair of auxiliary fold lines p connecting the tongue-piece breakable line j inside the opposing region (a position not overlapping the upper inner flaps 14a and 14b in plan view) are provided.

[0039] The packaging box 1 shown in FIG. 1 is assembled from the cardboard 1X having the above-described configuration shown in FIG. 2.

[0040] That is, the pair of first side plates 11a and 11b and the pair of second side plates 12a and 12b of the cardboard 1X are bent in the same direction along the body fold lines a to c, respectively, and then the adhesive piece 13 continuously provided at the left end edge of the second side plate 12b is superposed and adhered to the inner surface of the right end portion of the first side plate 11a. Thereby, a rectangular tubular body portion 2 is formed.

[0041] Subsequently, the pair of lower inner flaps 15a and 15b are bent horizontally along the lower inner flap fold lines f, respectively, and the pair of lower outer flaps 17a and 17b are bent horizontally along the lower outer flap fold lines h, respectively, and superposed on the outside of the lower inner flaps 15a and 15b, and the superposed portion is adhered with an adhesive, thereby forming the bottom portion 4.

[0042] Next, place the item to be packaged inside the body 2. Then, horizontally fold the pair of upper inner flaps 14a and 14b along the upper inner flap fold lines e respectively so that their leading edges face each other. Next, horizontally fold the pair of upper outer flaps 16a and 16b along the upper outer flap fold lines g respectively and overlap them outside the upper inner flaps 14a and 14b, and abut their leading edges against each other.

[0043] Next, by sticking an adhesive tape (not shown) of a predetermined width along the abutting portion where the leading edges of the pair of upper outer flaps 16a and 16b are abutted against each other from the first window lid portion 31a of the first side plate 11a to the first window lid portion 31b of the first side plate 11b, the top portion 3 is formed, and as shown in FIG. 1, the packaging box 1 is formed.

[0044] Next, with reference to FIGS. 3 to 6, the operation procedure for putting the packaging box 1 of the present embodiment in a window-open state for display will be described.

[0045] First, as shown in FIG. 3, push the locking tongue pieces 41a and 41b formed on the upper outer flaps 16a and 16b inward. As a result, the tongue piece breakable line j is broken, so the locking tongue pieces 41a and 41b are folded inside the packaging box 1 along the tongue piece fold line i.

[0046] At this time, the side ends of the locking tongue pieces 41a and 41b are formed to a position overlapping the upper inner flaps 14a and 14b in plan view. However, since a pair of auxiliary fold lines p are formed at positions not overlapping the upper inner flaps 14a and 14b in plan view, the locking tongue pieces 41a and 41b are once bent along the auxiliary fold lines p while passing through the gap between the leading edges of the upper inner flaps 14a and 14b, and then are folded back by the elastic restoring force of the corrugated cardboard.

[0047] Next, as shown in FIG. 4, the finger insertion portions 23 formed in the first side plates 11a and 11b are pushed inward. At this time, since the cuts 23a and 23c, 23c extending in the vertical direction in the finger insertion portions 23 are cut, the regions sandwiched by the cuts 23c, 23c among the breakable lines 21a and 21b are broken, and the fold line 23b is mountain-folded, and the finger insertion portions 23 are folded inside the body portion 2.

[0048] Next, insert a finger or the like inside the body portion 2 through the opening formed by the finger insertion portion 23, place a finger on the inner surfaces of the first side plates 11a and 11b, and pull upward in a direction away from the first side plates 11a and 11b with the window fold line e1 as the rotation axis. As a result, the breakable lines 21a and 21b are broken from the center toward the upper left and upper right, respectively, the entire breakable lines 21a and 21b are broken, and window portions 110a and 110b are formed in the first side plates 11a and 11b.

[0049] Next, as shown in FIG. 4, the finger insertion portions 23 formed in the second side plates 12a and 12b are pushed inward. At this time, since the cuts 23a and 23c, 23c extending in the vertical direction in the finger insertion portions 23 are cut, the regions sandwiched by the cuts 23c, 23c among the breakable lines 22a and 22b are broken, and the fold line 23b is mountain-folded, and the finger insertion portions 23 are folded inside the body portion 2.

[0050] Next, insert a finger or the like inside the body portion 2 through the opening formed by the finger insertion portion 23, place a finger on the inner surfaces of the second side plates 12a and 12b, and pull upward in a direction away from the second side plates 12a and 12b with the window fold line g1 as the rotation axis. As a result, the breakable lines 22a and 22b are broken from the center toward the upper left and upper right, respectively, the entire breakable lines 22a and 22b are broken, and window portions 120a and 120b are formed in the second side plates 12a and 12b.

[0051] Next, as shown in FIG. 5, the first window lid portions 31a and 31b and the second window lid portions 32a and 32b are sequentially folded back in the circumferential direction. For example, the lower surface of one locking portion 32c of the second window lid portion 32a adjacent in the circumferential direction is superposed on the upper surface of the locking portion 31c of the first window lid portion 31a. Next, the lower surface of one locking portion 31c of the first window lid portion 31b adjacent in the circumferential direction is superposed on the upper surface of the other locking portion 32c of the second window lid portion 32a. Next, the lower surface of one locking portion 32c of the second window lid portion 32b adjacent in the circumferential direction is superposed on the upper surface of the other locking portion 31c of the first window lid portion 31b.

[0052] And finally, the laminated region of the locking portion 31c of the first window lid portion 31a folded back first, which faces the lower surface of the other locking portion 32c of the second window lid portion 32b folded back, is pulled out to the upper surface side of the other locking portion 32c of the second window lid portion 32b. Thereby, the first window lid portions 31a and 31b and the second window lid portions 32a and 32b are locked to each other.

[0053] Next, the operation and effect of this embodiment will be described.

[0054] In the packaging box 1 of this embodiment, since the window portions 110a, 110b, 120a, and 120b can be opened in the four side plates, the products stored inside can be visually recognized from four directions, improving the display effect of the products and facilitating the taking out of the products.

[0055] Further, since the first window lid portions 31a and 31b and the second window lid portions 32a and 32b can be locked to each other only by sequentially folding them back in the circumferential direction, the locking operation is easy.

[0056] Further, since the breakable lines 21a and 21b and the breakable lines 22a and 22b are broken, the first window lid portions 31a and 31b and the second window lid portions 32a and 32b are sequentially folded back in the circumferential direction, and they are only locked to each other on the upper surface of the top portion 3. When making the window open state for display, it is not necessary to take out the products stored inside the packaging box 1 once, so the operation is easy.

[0057] In the packaging box 1 of this embodiment, as shown in FIG. 6, the first window lid portions 31a and 31b and the second window lid portions 32a and 32b are folded back along the window fold line e1 and the window fold line g1 and maintained in a posture where they overlap on the top portion. Thus, the rigidity of the top portion 3 can be increased, so that even when the stored product is a medium-weight or heavy-weight item, it is possible to prevent the upper packaging box 1 stacked above from collapsing.

[0058] In the packaging box 1 of this embodiment, the top portion 3 is closed by fixing the leading edges of the upper outer flaps 16a and 16b with an adhesive tape, and the upper outer flaps 16a and 16b and the upper inner flaps 14a and 14b are not adhered to each other. Therefore, when the first window lid portions 31a and 31b of the first side plates 11a and 11b are broken along the breakable lines 21a and 21b, folded back along the window fold line e1, and overlapped on the top portion 3, the upper inner flaps 14a and 14b may fall inside the packaging box 1 due to the elastic restoring force of the window fold line e1.

[0059] However, in the packaging box 1 of this embodiment, as shown in FIG. 7, since the locking tongue pieces 41a and 41b are formed on the upper outer flaps 16a and 16b, the edges of the upper inner flaps 14a and 14b can be locked by these locking tongue pieces 41a and 41b, so that the upper inner flaps 14a and 14b can be prevented from falling.

[0060] In addition, since a pair of auxiliary fold lines p are respectively provided on the locking tongue pieces 41a and 41b, the edges of the upper inner flaps 14a and 14b can be locked only by pushing them inward of the packaging box 1.

[0061] Moreover, a U-shaped cut k is formed between a pair of tongue piece fold lines i on the locking tongue pieces 41a and 41b. Since the corrugated cardboard has a thickness, when it is bent, the concave portion formed by the cut k on the side of the locking tongue pieces 41a and 41b collides with the convex portion formed by the cut k on the side of the upper outer flaps 16a and 16b. Therefore, the locking tongue pieces 41a and 41b pushed inward of the packaging box 1 are prevented to a certain extent from being restored to a horizontal state.

[0062] Although not shown, perforations may be provided in the portion of the upper inner flap folding line e outside the window folding line e1 and in the portion of the upper outer flap folding line g outside the window folding line g1. According to this configuration, by tearing the top portion 3 of the topmost packaging box 1 in FIG. 6 along the perforations, the top portion 3 can be removed to form a tray shape.

[0063] Also, in this case, since the upper inner flaps 14a and 14b are connected to the upper outer flaps 16a and 16b by an adhesive tape via the first window lid portions 31a and 31b, the dust generated when the top portion 3 is removed is collected into one piece, making it easy to discard.

[0064] [Modification Example] Next, a modification example of the packaging box 1 of the present embodiment will be described. In the packaging box 1 according to the above-described embodiment, window lid portions are formed on each of the four side plates constituting the rectangular tube-shaped body portion 2, and when the windows are opened, an example in which the four window lid portions are sequentially folded back in the circumferential direction and locked to each other on the upper surface of the top portion 3 has been described. However, the present invention is not limited to this. For example, it may be configured as shown in the following modification example.

[0065] FIG. 8 is a perspective view showing the configuration of a packaging box 1A, which is a modification example of the packaging box of the present invention. FIG. 9 is a developed view of the cardboard 1AX constituting the packaging box 1A.

[0066] As shown in FIG. 8, the packaging box 1A is formed in a rectangular parallelepiped shape by a rectangular tube-shaped body portion 2, a top portion 3 that closes the upper end of the body portion 2, and a bottom portion 4 that closes the lower end of the body portion 2.

[0067] As shown in the developed view in FIG. 9, the packaging box 1A is formed from a single substantially rectangular cardboard sheet 1AX made of corrugated paper.

[0068] The packaging box 1A and the cardboard 1AX are different from the packaging box 1 and the cardboard 1X in that substantially U-shaped breakable lines (perforations) 21a and 21b are not provided at the central portions of the second side plates 12a and 12b, as shown in FIGS. 8 and 9.

[0069] Further, as shown in FIGS. 8 and 9, on the lower end side of the second window lid portion 32a, a locking piece fold line q extending parallel to the upper outer flap fold line g and a cut line r connecting both ends of the locking piece fold line q and bulging and extending in a direction away from the locking piece fold line q and toward the fold line g side of the outer flap are provided. A region surrounded by the locking piece fold line q and the cut line r is defined as a locking portion 33a.

[0070] Also, on the lower end side of the second window lid portion 32b, a locking portion 33b formed of a cut line extending parallel to the upper outer flap fold line g is provided. The locking portion 33b is formed such that the tip of the locking portion 33a can be inserted therein. Further, after the locking portion 33a is inserted into the locking portion 33b, it can be bent.

[0071] Next, with reference to FIGS. 10 and 11, a working procedure for putting the packaging box 1A of the modified example into a window-open state for display will be described.

[0072] First, as shown in FIG. 10, the finger insertion portions 23 formed in the second side plates 12a and 12b are pushed inward. At this time, since the cut lines 23a and 23c, 23c extending in the vertical direction among the finger insertion portions 23 are cut, the regions sandwiched by the cut lines 23c, 23c among the breakable lines 22a and 22b are broken, and the fold line 23b is valley-folded, and the finger insertion portions 23 are folded inside the body portion 2.

[0073] Next, fingers or the like are inserted into the body portion 2 through the openings formed by the finger insertion portions 23, fingers are placed on the inner surfaces of the second side plates 12a and 12b, and the window fold line g1 is pulled upward with the window fold line g1 as a rotation axis in an upward direction and a direction away from the second side plates 12a and 12b. As a result, the breakable lines 22a and 22b are broken from the center toward the upper left and upper right, respectively, the entire breakable lines 22a and 22b are broken, and window portions 120a and 120b are formed in the second side plates 12a and 12b.

[0074] Next, as shown in FIG. 10, push the locking portion 33a provided on the second window lid portion 32a upward along the cut line r. At this time, the locking portion 33a is bent along the locking piece fold line q.

[0075] Next, as shown in FIG. 11, first, fold back the second window lid portion 32b and the second window lid portion 32a in sequence. At this time, since the tip of the bent locking portion 33a faces downward, insert the tip of the locking portion 33a into the locking portion 33b of the second window lid portion 32b, and then bend it to lock the second window lid portion 32a and the second window lid portion 32b to each other.

[0076] Next, the operation and effect of the modified example will be described.

[0077] According to this modified example, since the window lid portions are provided only on the two opposing long-side side plates (the second side plates 12a and 12b), the rigidity as a tray can be further enhanced.

[0078] Also, just by inserting the locking portion 33a formed on the second window lid portion 32a into the locking portion 33b formed on the second window lid portion 32b, the second window lid portion 32a and the second window lid portion 32b can be maintained in a posture where they are superposed on the top portion 3A, so the operation of making the window in the display open state is easy.

[0079] Also, in this case, there is no dropping of the upper inner flaps 14a and 14b, and there is no need to provide the locking tongue pieces 41a and 41b on the upper outer flaps 16a and 16b as in the above-described embodiment.

[0080] [Other Modified Examples] In the above-described embodiments and modifications, the first window lid portions 31a, 31b, 32a and the second window lid portions 32a, 32b, 32b have been described by way of example as inverted trapezoids formed from substantially U-shaped breakable lines 21a, 21b, 22a, 22b. However, the present invention is not limited thereto. As long as they can be locked to each other in a state of being superposed on the upper surfaces of the top portions 3, 3A when folded back, they may be formed from breakable lines of other shapes. For example, they may be V-shaped. Further, the breakable lines may extend in a wavy shape that is not linear but has an amplitude. Also, they may be in contact with the lower end edges of the first side plates 11a, 11b, 32a and the second side plates 12a, 12b, 32b.

[0081] In the above-described embodiments and modifications, the first window lid portions 31a, 31b, 32a and the second window lid portions 32a, 32b, 32b have been described by way of example as being locked to each other. However, the present invention is not limited thereto. For example, the window lid portions may be configured to be locked to the top portions 3, 3A.

[0082] In the above-described embodiments and modifications, the box bodies 1 and 1A of the packaging boxes have been described by way of example as having a rectangular tubular body portion 2. However, the present invention is not limited thereto. For example, they may be polygonal tubular shapes such as triangular tubular, pentagonal tubular, hexagonal tubular, etc.

[0083] In the above-described embodiments and modifications, the breakable lines 21a, 21b, 22a, 22b have been described by way of example as perforations formed by a plurality of linear cuts. However, the present invention is not limited thereto. For example, they may be constituted by a zipper formed by a plurality of cuts with one end bent. Also, in the present invention, the finger insertion portion 23 is not limited to the shape described in the above-described embodiments and modifications, and may be omitted without being provided.

[0084] In the above-described embodiments and modifications, an example has been described in which the upper outer flaps 16a and 16b are sealed by being attached along the leading edges with an adhesive tape. However, the present invention is not limited to this. For example, the upper inner flaps 14a and 14b and the upper outer flaps 16a and 16b may be adhered with an adhesive. In this case, since the upper inner flaps 14a and 14b do not fall, it is not necessary to provide the locking tongue pieces 41a and 41b on the upper outer flaps 16a and 16b.

[0085] In the above-described embodiments, the locking tongue pieces 41a and 41b are formed with a cut k and an auxiliary folding line p. However, these shapes are not limited to those of the above-described embodiments and may also be omitted.

[0086] In the above-described embodiments, cardboard paper has been described as an example of the material. However, the material may be cardboard paper or a thin synthetic resin plate as long as it can be bent and assembled.

[0087] The present invention is not limited to the above-described embodiments and includes various forms with design changes within the scope not departing from the gist of the invention described in the claims.

Explanation of Reference Numerals

[0088] 1, 1A Packaging box 2, 2A Body part 3, 3A Top part 4, 4A Bottom part 11a, 11b First side plate 12a, 12b Second side plate 13 Adhesive piece 14a, 14b Upper inner flap (inner flap) 15a, 15b Lower inner flap (inner flap) 16a, 16b Upper outer flap (outer flap) 17a, 17b Lower outer flap (outer flap) 21a, 21b Perforated line (stitch mark) 22a, 22b Perforated line (stitch mark) 23 Finger insertion part 23a, 23c cuts 23b fold line 31a, 31b first window cover parts 32a, 32b second window cover parts 31c, 32c locking parts 32a first window cover part 32b second window cover part 33a, 33b locking parts 41a, 41b locking tongue pieces 100, 100A trays 110, 110A column parts 120, 120A placement parts 130, 130A connecting parts a fold line b fold line c fold line d fold line e upper inner flap fold line e1 window fold line f lower inner flap fold line g outer flap fold line g1 window fold line h outer flap fold line i tongue piece fold line j tongue piece breakable line k cuts p auxiliary fold line q locking piece fold line r cut line

Claims

1. A rectangular tube-shaped body portion extending in the vertical direction formed by a plurality of side plates, A bottom portion that seals the lower end opening of the body portion, A top portion that seals the upper end opening of the body portion, A window fold line provided at the middle portion of the upper edge of the side plate, A breakable line that connects both ends of the window fold line and extends downward in a convex shape, A window lid portion that is a region surrounded by the breakable line and the window fold line, A locking portion provided on the window lid portion, which maintains the window lid portion in a posture where it is broken along the breakable line, folded back along the window fold line, and overlapped with the top portion. A packaging box characterized by having the above.

2. In the packaging box according to Claim 1, The window lid portion is provided on each of two or more side plates, The locking portion is characterized in that it locks one window lid portion and another window lid portion to each other. A packaging box.

3. In the packaging box according to Claim 1, The window lid portion is provided on each of the plurality of side plates, The locking portion is, Provided on both side portions of the window lid portion, By sequentially folding back a plurality of the window lid portions in the circumferential direction, the lower surface of the locking portion of the window lid portion adjacent in the circumferential direction is superposed on the upper surface of the locking portion of one of the window lid portions, and finally, the laminated region of the locking portion of the first folded window lid portion facing the lower surface of the locking portion of the last folded window lid portion is pulled out to the upper surface side of the last folded window lid portion, thereby locking them to each other. A packaging box characterized by the above.

4. In the packaging box according to any one of Claims 1 to 3, The body portion has a pair of first side plates facing each other and a pair of second side plates facing each other in a direction different from the direction in which the first side plates face each other, An inner flap is continuously provided on each first side plate at its upper edge via an inner flap fold line, An outer flap is continuously provided on each second side plate at its upper edge via an outer flap fold line, The top portion is formed by superposing both outer flaps that are horizontally folded so that their leading edges face each other on the upper surfaces of both inner flaps that are horizontally folded so that their leading edges face each other, and attaching an adhesive tape with a predetermined width along the butting portion where the leading edges of both outer flaps are butted against each other, The outer flap is provided with a tongue piece fold line that extends along the outer flap fold line inside the opposing region where the leading edges of a pair of inner flaps face each other in a plan view, and a tongue piece breakable line that connects both ends of the tongue piece fold line and bulges and extends in a direction away from the tongue piece fold line and outside the opposing region. A packaging box characterized by the above.

5. The packaging box according to claim 4, wherein an auxiliary folding line is provided on the outer flap to connect the tongue breakable line inside the opposing region in a plan view, the packaging box being characterized by this.

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