JP2019104522A - Packing box - Google Patents

Abstract

To provide a packaging box that can be assembled easily and quickly.SOLUTION: A packaging box 1 includes four upper flaps 14A, 14B, 15A, 15B (14, 15) in a state of being bent inside of a peripheral wall 1W. A pair of engagement structures 20A, 20B, 30A, 30B (20, 30) are formed on both sides of each of the upper flaps 14, 15. Each of the engagement structures 20, 30 includes a distal end overlapped part, base end overlapped parts 22B, 32A, and an engaging recess part formed therebetween. The pair of upper flaps 14B, 15A are engaged with each other in a state that an engaging recess part 23B is inserted into an engaging recess part 33A, a distal end overlapped part 21B is overlapped on a surface of a distal end overlapped part 31A, and the base end overlapped part 32A is overlapped on a surface of the base end overlapped part 22B. By engaging the upper flaps 14B, 15A at one location, the four upper flaps 14, 15 are maintained in a bent state.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a packaging box.

  Packaging boxes are known which can keep the flaps folded.

  For example, the cardboard box described in Patent Document 1 has first to fourth flaps connected to four rectangular side walls. The first other end of the first flap and the fourth end of the fourth flap are formed with connecting means consisting of one groove and the other groove. In this cardboard box, after the first to fourth flaps are folded in order, the first flap is pulled up and the one groove is engaged with the other groove, so that the first to fourth flaps are maintained in a mutually bent state It had been.

Patent No. 4986653

  However, in the above cardboard box, it is necessary to fold the first to fourth flaps in this order, and if any of the first to fourth flaps is folded in the wrong order, the first to fourth flaps are folded. It was not possible to keep it in a bent state. For this reason, a worker who is not accustomed to the assembling work of the cardboard box may mistake the order of bending the first to fourth flaps, and can not assemble the cardboard box smoothly. That is, the above-mentioned cardboard box can not be easily assembled by anyone.

  In order to solve the above problems, for example, it is also conceivable to instruct the operator of the order by printing the order of bending the first to fourth flaps. However, in this case, there arises a problem that the time and cost required for printing increase. In addition, the worker can not assemble the cardboard box in a short time because the worker works while checking the printed order.

  The present invention provides a packaging box that can be easily and quickly assembled to solve the above problems.

  In order to achieve the above-mentioned object, the packaging box of the present invention is continuously connected to a peripheral wall formed in a cylindrical shape with an open end face and an end of the peripheral wall, and the peripheral wall is bent inward of the peripheral wall And four flaps closing at least a part of the opening, and a pair of engagement structures are formed on both sides of each of the flaps, each of the engagement structures being formed at a tip corner of the flap The formed end polymerizing portion, the base end polymerizing portion formed adjacent to the end polymerizing portion on the base end side of the flap, and the end polymerizing portion and the base end polymerizing portion A pair of adjacent ones of the flaps insert one of the engagement recesses into the other of the engagement recesses, and one of the leading end overlapping portions of the other of the leading end overlapping portions Overlapping the surface, and the other of the above-mentioned proximal polymerization portions being one of the above-mentioned proximal polymerization portions The four flaps are bent toward the inner side of the peripheral wall by being engaged with each other in a state of being superimposed on the surface and the pair of adjacent flaps of at least one of the four flaps being engaged with each other maintain.

  In this case, each of the engagement structures preferably includes a tip bending curve formed on the flap for bending the tip overlapping portion.

  In this case, the distal end overlapping portion is formed at a position shifted to the center side of the flap relative to the proximal end overlapping portion, and the distal end bending curve is formed from the proximal end to the distal end of the flap. The projecting dimension of the distal end overlapping portion from the distal end bending line is formed to be inclined toward the center side, and the projecting dimension of the distal end overlapping portion is the extension of the proximal end overlapping portion extending toward the proximal end overlapping portion. It is preferable that the length is set longer than the projecting dimension.

  In this case, the peripheral wall is formed by connecting four walls via a first fold line extending in a first direction, and the flap is a second fold extending in a second direction orthogonal to the first direction. The tip bending line is formed on a virtual line extending at an angle of 45 degrees from the intersection point of the first bending line and the second bending line to the tip of the flap. Is preferred.

  According to the present invention, the packaging box can be assembled easily and quickly.

It is a perspective view showing the packing box concerning one embodiment of the present invention. It is a top view showing a blank of a packing box concerning one embodiment of the present invention. It is the top view to which a part of blank of the packaging box concerning one embodiment of the present invention was expanded. It is a perspective view which shows the middle of the assembly of the packaging box which concerns on one Embodiment of this invention. It is a perspective view showing the state where four upper flaps of a packing box concerning one embodiment of the present invention were bent inside a peripheral wall. It is a perspective view which shows the process in which a part of adjacent upper flap of the packaging box which concerns on one Embodiment of this invention is engaged. It is a packaging box which concerns on one Embodiment of this invention, Comprising: It is a perspective view which shows the state assembled by other engagement procedure (2). It is a packaging box which concerns on one Embodiment of this invention, Comprising: It is a perspective view which shows the state assembled by other engagement procedure (3). It is a packaging box which concerns on one Embodiment of this invention, Comprising: It is a perspective view which shows the state assembled by other engagement procedure (4). It is a packaging box which concerns on one Embodiment of this invention, Comprising: It is a perspective view which shows the state assembled by other engagement procedure (5). It is a packaging box which concerns on one Embodiment of this invention, Comprising: It is a perspective view which shows the state assembled by other engagement procedure (5). It is a perspective view which shows the packaging box which concerns on the modification of one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. Note that "D" shown in the drawings indicates "length direction", "W" indicates "width direction" orthogonal to the length direction, and "H" indicates "upper and lower" orthogonal to the length direction and width direction "Direction (height direction)" is shown. Although terms used herein indicate directions or positions, these terms are used for the convenience of description and do not limit the technical scope of the present invention.

[Overview of packaging box]
The configuration of the packaging box 1 according to the first embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view showing the packaging box 1. FIG. 2 is a plan view showing the blank 5 of the packaging box 1. FIG. 3 is a plan view enlarging a part of the blank 5.

  As shown in FIG. 1, the packaging box 1 is formed in a substantially rectangular parallelepiped shape that is long in the length direction. The packaging box 1 is assembled by closing the lower end surface of the substantially rectangular cylindrical peripheral wall 1W and closing a part of the upper end surface of the peripheral wall 1W. A predetermined content (for example, fruits and vegetables, etc. (not shown)) is accommodated inside the packaging box 1. An opening is formed near the center of the upper end surface of the assembled packaging box 1 so that the stored contents can be confirmed from the outside.

  The packaging box 1 is formed by assembling the blank 5 shown in FIG. The blank 5 is formed, for example, by punching out a sheet of paper cardboard sheet with a die. The corrugated cardboard sheet is, for example, a double-faced corrugated cardboard sheet in which a front liner 9B and a back liner 9C (see FIG. 4) are laminated on the front and back of a corrugated centerline 9A. FIG. 2 shows the front surface liner 9B side (the outer surface side of the packaging box 1). In this specification, the direction (first direction) parallel to the center 9A of the cardboard sheet is referred to as "step direction", and the direction (second direction) orthogonal to the step direction is referred to as "flow direction". “X” shown in the drawings indicates “stage direction”, and “Y” indicates “flow direction”.

[blank]
As shown in FIG. 2, the blank 5 includes a pair of end walls 10A and 10B, a pair of side walls 11A and 11B, a pair of lower inner flaps 12A and 12B, a pair of lower outer flaps 13A and 13B, and a pair of lower outer flaps 13A and 13B. It includes a first upper flap 14A, 14B and a pair of second upper flaps 15A, 15B. Note that, since the pair of end walls 10A and 10B have substantially the same shape, in the description common to both of the present specification, only the digit is used as a code. For the same reason, a pair of side walls 11A, 11B, a pair of lower inner flaps 12A, 12B, a pair of lower outer flaps 13A, 13B, a pair of first upper flaps 14A, 14B and a pair of second upper flaps Also in 15A and 15B, in the description common to each, only the digit for calculation will be used as a code.

<End wall, side wall>
The pair of end walls 10A and 10B and the pair of side walls 11A and 11B are alternately arranged in a line in the flow direction, and are continuously provided via a vertical fold line L1 (first fold line) extending in the step direction . The end walls 10A and 10B and the side walls 11A and 11B are formed in a substantially rectangular shape having substantially the same size in the step direction. The end walls 10A and 10B are formed narrower in the flow direction than the side walls 11A and 11B. A passage piece 16 is continuously provided at the end in the flow direction of the side wall 11B via a vertical fold curve L1. The lower fins 16A are connected to one end (lower end) of the passage piece 16 in the step direction.

  On the upper side of the end wall 10, a grip hole 17 is formed for a worker to put a hand when transporting the packaging box 1. The grip hole 17 is formed in a substantially elliptical shape long in the flow direction, and the upper half of the grip hole 17 is closed by the grip piece 17A. The gripping piece portion 17A is continuously provided to the upper edge of the gripping hole 17 via the gripping ruled line 17B.

  The vertical folding curve L1 and the grip ruled line 17B are general-purpose ruled lines formed by squeezing the corrugated cardboard sheet in the thickness direction from the back liner 9C side in a straight line. The vertical folding curve L1 and the gripping creases 17B have a function of bending the cardboard sheet so that the back liner 9C is directed inward. Although the details will be described later, by bending the pair of end walls 10A and 10B and the pair of side walls 11A and 11B substantially at right angles to each other, a substantially rectangular cylindrical peripheral wall 1W having open upper and lower end surfaces is formed.

<Lower inner flap, lower outer flap>
The pair of lower inner flaps 12A, 12B are connected to the step direction one end (lower end) of the pair of end walls 10A, 10B via a lower bending line L2 extending in the flow direction. The lower inner flap 12 is formed in a substantially rectangular shape elongated in the flow direction. The step size (extension size) of the lower inner flap 12 is set to about half of the flow direction size of the end wall 10, and the flow direction size of the lower inner flap 12 is substantially the same as the flow direction size of the end wall 10 It is set identically. The pair of lower outer flaps 13A and 13B are connected to one end in the step direction of the pair of side walls 11A and 11B via the lower bending line L2. The lower outer flap 13 is formed in a substantially rectangular shape elongated in the flow direction. The dimension in the step direction (extension dimension) of the lower outer flap 13 is set substantially the same as the extension dimension of the lower inner flap 12, and the dimension in the flow direction of the lower outer flap 13 is substantially the same as the dimension in the flow direction of the side wall 11 It is set to. The lower outer flap 13 is formed with a ventilation hole 18 for ventilation.

<First upper flap, second upper flap>
The pair of first upper flaps 14A, 14B are connected to the other end (upper end) of the pair of end walls 10A, 10B via the upper folding line L3 (second folding line) extending in the flow direction It is done. The first upper flap 14 is chamfered in the form of a pair of circular arcs on both sides in the flow direction, and is formed in a substantially trapezoidal shape elongated in the flow direction. The stepwise dimension (extension dimension) of the first upper flap 14 is set shorter than the extension dimension of the lower inner flap 12, and the dimension in the flow direction of the first upper flap 14 is in the flow direction of the end wall 10. It is set to be approximately the same as the dimensions. The pair of second upper flaps 15A and 15B are connected to the other end in the step direction of the pair of side walls 11A and 11B via the upper fold line L3. The second upper flap 15 is chamfered in the shape of two arcs on both sides in the flow direction, and is formed in a substantially trapezoidal shape elongated in the flow direction. The stepwise dimension (extension dimension) of the second upper flap 15 is set to be substantially the same as the extension dimension of the first upper flap 14, and the dimension in the flow direction of the second upper flap 15 is the flow of the side wall 11 It is set substantially the same as the dimension of the direction.

  The lower folding line L2 and the upper folding line L3 are general-purpose creases, and have the function of bending the lower flaps 12, 13 and the upper flaps 14, 15 to the inside of the peripheral wall 1W. The end wall 10A and the side wall 11B are bent along the vertical bending curve L1, the passage piece 16 is fixed to the inner surface of the end wall 10A, and the lower fin 16A is fixed to the inner surface of the lower inner flap 12A. The passage piece 16 and the lower fillet 16A are fixed to the end wall 10A and the lower inner flap 12A using a wire, an adhesive, a double-sided tape or the like. Thereby, the packaging box 1 (carton) in a folded state is manufactured (not shown).

<Engagement structure>
As shown in FIG. 2, a pair of engagement structures 20A, 20B, 30A, 30B are formed on both sides in the flow direction of the upper flaps 14, 15, respectively. That is, four pairs of engagement structures 20A, 20B, 30A, and 30B are provided corresponding to the four upper flaps 14 and 15, respectively. Each engaging structure 20A, 20B, 30A, 30B has a function of maintaining the four upper flaps 14, 15 in a bent state inside the peripheral wall 1W by engaging the adjacent upper flaps 14, 15 with each other. Have.

  Each of the engaging structures 20A, 20B, 21A, 21B includes: distal end overlapping portions 21A, 21B, 31A, 31B, proximal end overlapping portions 22A, 22B, 32A, 32B, and engagement recesses 23A, 23B, 33A, 33B , Tip bends 24A, 24B, 34A, 34B. The front end overlapping portions 21A, 21B, 31A, 31B are formed at the front end corner portions of the upper flaps 14, 15, respectively. The proximal polymerization portions 22A, 22B, 32A, 32B are formed adjacent to the distal end polymerization portions 21A, 21B, 31A, 31B on the proximal end sides of the upper flaps 14, 15, respectively. The engagement recesses 23A, 23B, 33A, 33B are formed between the distal end overlapping portions 21A, 21B, 31A, 31B and the proximal end overlapping portions 22A, 22B, 32A, 32B. Tip bending curves 24A, 24B, 34A, 34B are formed on the upper flaps 14, 15 respectively for bending the tip overlapping portions 21A, 21B, 31A, 31B.

  In the description common to the pair of engagement structures 20A, 20B, 30A, and 30B provided in the present specification, only the arithmetic numerals will be used as the reference numerals. For the same reason as this, a pair of end overlapping portions 21A, 21B, 31A, 31B, a pair of base end overlapping portions 22A, 22B, 32A, 32B, a pair of engagement recesses 23A, 23B, 33A, 33B and a pair of ends Also in the description common to each of the folding lines 24A, 24B, 34A, 34B, only the arithmetic numerals will be used as codes. The four pairs of engaging structures 20A, 20B, 30A, and 30B have substantially the same shape, and therefore, the following description focuses on the pair of engaging structures 20A.

  As shown in FIGS. 2 and 3, the pair of distal end overlapping portions 21A, the pair of proximal end overlapping portions 22A, the pair of engagement concave portions 23A, and the pair of distal end bending curves 24A included in the pair of engaging structures 20A are When the first upper flap 14A is folded at the center in the flow direction, it has a shape (axisymmetric shape) that matches each other.

(Tear end polymerization part, base end polymerization part)
The pair of leading end overlapping portions 21A and the pair of base end overlapping portions 22A are formed on both sides in the flow direction of the first upper flap 14A. Further, the distal end overlapping portion 21A is formed on the distal end side half of the first upper flap 14A, and the proximal end overlapping portion 22A is formed on the proximal end side of the first upper flap 14A. The pair of proximal end polymerization portions 22A are formed in a substantially quarter circular shape (substantially fan shape) curved so as to approach each other from the flow direction both ends of the upper bending line L3 toward the tip of the first upper flap 14A. . The pair of end polymerizing portions 21A is formed in a substantially quarter-circle shape curved so as to approach each other from the end of the pair of base end polymerizing portions 22A toward the end of the first upper flap 14A. The leading end polymerized portion 21A is formed at a position shifted to the center side of the first upper flap 14A relative to the proximal end polymerized portion 22A. That is, the interval in the flow direction of the pair of distal end overlapping portions 21A is narrower than the interval in the flow direction of the pair of proximal end overlapping portions 22A. The leading end overlapping portion 21A and the proximal end overlapping portion 22A form a substantially stair-like shape by continuously connecting a convex shape obtained by curving the end edge.

(Engagement recess)
The engagement recess 23A is formed in a substantially V shape (or a substantially L shape) in the vicinity of the connection portion between the distal end overlapping portion 21A and the proximal end overlapping portion 22A.

(Tip curve)
The distal bending line 24A is formed to be inclined toward the central side in the flow direction of the first upper flap 14A from the proximal side to the distal side of the first upper flap 14A. Specifically, the tip bending curve 24A is formed on a virtual line V (straight line) extending at an oblique angle of 45 degrees from the intersection of the vertical bending curve L1 and the upper bending curve L3 to the tip of the first upper flap 14A. (See Figure 3). The tip bending curve 24A extends from the engagement recess 23A to the tip of the first upper flap 14A at an inclination of 45 degrees with respect to the upper bending curve L3 (see FIG. 3). The tip folding curve 24A is formed to define a tip overlapping portion 21A which protrudes from both ends of the first upper flap 14A. Note that "on the imaginary line V" does not require the complete coincidence with the imaginary line V, and means, for example, to allow a manufacturing error of about 1 mm.

  As shown in FIG. 3, the protrusion dimension S1 of the distal end overlapping portion 21A from the distal end bending curve 24A is a proximal end from an extension line (or an imaginary line V) extending the distal end bending curve 24A toward the proximal end overlapping portion 22A. It is set to be longer than the projecting dimension S2 of the overlapping portion 22A. The projecting dimension S1 of the end overlapping portion 21 is set to a dimension that allows adjacent end overlapping portions 21 to overlap with each other in a state in which the upper flaps 14 and 15 are bent inside the peripheral wall 1W. There is. Similarly to this, the protrusion dimension S2 of the proximal end polymer portion 22 is also set to a dimension that allows adjacent distal end polymer portions 21 to overlap with each other. Further, the projecting dimensions S1 and S2 are set such that the engagement recesses 23 and 33 engage (engage) in a state in which the respective upper flaps 14 and 15 are bent inside the peripheral wall 1W. The protruding dimensions S1 and S2 of the respective overlapping portions 21A and 22A vary depending on the size of the packaging box 1. For example, when one side in the length direction and one side in the width direction of the packaging box 1 are about 300 to 600 mm, the tip It is preferable that the protrusion dimension S1 of the polymerized portion 21A be set in the range of 25 to 30 mm, and the protrusion dimension S2 of the proximal end polymerized portion 22A be set in the range of 20 to 25 mm.

[Assembly of packaging box]
Next, with reference to FIG. 1, FIG. 4 to FIG. 6, the process (assembly operation) of assembling the packaging box 1 to accommodate the contents will be described. FIG. 4 is a perspective view showing the packaging box 1 in the middle of assembly. FIG. 5 is a perspective view showing a state in which the four upper flaps 14 and 15 of the packaging box 1 are bent to the inside of the peripheral wall 1W. FIG. 6 is a perspective view showing the process of engaging a part of the upper flaps 14 and 15 adjacent to each other. Here, as an example, a case where a worker assembles the packaging box 1, packs contents, and seals the packaging box 1 will be described.

  First, the worker molds the peripheral wall 1W from the folded carton. Specifically, the worker bends the pair of end walls 10A and 10B and the pair of side walls 11A and 11B substantially at right angles with the vertical bending curve L1, and causes the pair of side walls 11A and 11B to face in the width direction. The end walls 10A and 10B are opposed in the longitudinal direction (see FIG. 4). Thereby, a substantially rectangular cylindrical peripheral wall 1W having the upper and lower end surfaces opened is formed.

  Next, the operator bends the pair of lower inner flaps 12A and 12B along the lower fold L2 to the inside of the peripheral wall 1W, and then the pair of lower outer flaps 13A and 13B along the lower fold L2. Bend inside the peripheral wall 1W. In this state, the tips of the pair of lower inner flaps 12A and 12B are separated from each other, and the tips of the pair of lower outer flaps 13A and 13B butt each other at substantially the center (see FIG. 4). An operator sticks an adhesive tape (not shown) along the butt | matching part of a pair of lower outer flaps 13A, 13B, and fixes lower outer flaps 13A, 13B to peripheral wall 1W. Thus, the bottom of the packaging box 1 is formed (see FIG. 4). The lower outer flaps 13A and 13B may be fixed to the lower inner flaps 12A and 12B using a wire (wire) or an adhesive.

  Next, the worker inserts (accommodates) the contents into the inside of the peripheral wall 1W from the upper surface opening of the peripheral wall 1W. Thereafter, the worker bends the four upper flaps 14 and 15 continuously provided at the upper end portion of the peripheral wall 1W inside the peripheral wall 1W (see FIG. 5). In this packaging box 1, the pair of upper flaps 14 and 15 adjacent to each other at at least one of the four upper flaps 14 and 15 engage (engage) with each other to form the four upper flaps 14 and 15 on the inner side of the peripheral wall 1W. It is configured to be maintained in a bent state.

<Engagement procedure of upper flap>
Hereinafter, the procedure for engaging the pair of upper flaps 14 and 15 adjacent to each other will be described. Here, as an example, the case where the first upper flap 14B and the second upper flap 15A are engaged will be described.

  As shown in FIG. 5, the operator folds the first upper flap 14B, the second upper flap 15B, the first upper flap 14A, and the second upper flap 15A in this order. The four upper flaps 14 and 15 are in a state of being bent inward of the peripheral wall 1W along the upper bending line L3, and are in a state of closing a part of the upper surface opening of the peripheral wall 1W. The vicinity of the center of the upper surface opening of the peripheral wall 1W is in an open state because it is not covered by the four upper flaps 14 and 15. Further, the distal end polymerizing portion 31A and the proximal end polymerizing portion 32A of the second upper flap 15A overlap the top surfaces of the distal end polymerizing portion 21B and the proximal end polymerizing portion 22B of the first upper flap 14B.

  Next, the operator grips and pulls up the tip of the first upper flap 14B located below the second upper flap 15A (see the broken arrow in FIG. 5). Then, as shown in FIG. 6, since the tip overlapping portion 21B of the first upper flap 14B is pressed against the tip overlapping portion 31A of the second upper flap 15A, the inner side (lower side) along the tip bending curve 24A. The second upper flap 15A is lifted while going up. When the leading end of the leading end overlapping portion 21B is pulled up to the upper side of the leading end overlapping portion 31A, the engagement recess 23B and the engagement recess 33A are engaged with each other (see FIG. 1).

  In this state, when the operator releases the first upper flap 14B, as shown in FIG. 1, the end overlapping portion 21B broken at the end bending line 24B is substantially flat due to the elastic force (restoring force) of the cardboard sheet. It returns to the state, and is in a state of being superimposed on the top surface of the leading end overlapping portion 31A. On the other hand, the proximal polymerization portion 22B is maintained at the lower side of the proximal polymerization portion 32A. That is, the first upper flap 14B and the second upper flap 15A intersect with each other at the engagement portion of the engagement recesses 23B and 33A.

  As described above, the first upper flap 14B and the second upper flap 15A adjacent to each other insert the engagement recess 23B (one side) into the engagement recess 33A (the other side) (mesh), and the leading end overlapping portion 21B (one side) Are engaged with each other in a state in which the proximal polymerization portion 32A (other) is overlapped on the surface of the proximal polymerization portion 22B (one). Since the pair of adjacent upper flaps 14B and 15A engage with each other at one place, and one of the adjacent upper flaps 14 and 15 overlaps the other at three other places, the four upper flaps 14 and 15 Maintained in a bent state. In this manner, the four upper flaps 14 and 15 are held in a substantially windmill shape, and the assembly operation of the packaging box 1 is completed.

<Engagement procedure of upper flap (2)>
In the above-described example (engagement procedure), the case has been described in which the leading end overlapping portion 21B is overlapped on the surface of the leading end overlapping portion 31A and the proximal end overlapping portion 32A is overlapped on the surface of the proximal end overlapping portion 22B. This superposition may be reversed as shown in FIG. As another example (engagement procedure (2)), the operator folded the second upper flap 15A, the first upper flap 14A, the second upper flap 15B, and the first upper flap 14B in this order. Afterward, the tip of the second upper flap 15A located below the first upper flap 14B is gripped and pulled up. Then, the first upper flap 14B and the second upper flap 15A adjacent to each other insert the engagement recess 23B into the engagement recess 33A, superimpose the distal end overlapping portion 31A on the surface of the distal end overlapping portion 21B, and the proximal end The overlapping portions 22B are engaged with each other in a state in which the overlapping portions 22B overlap the surface of the proximal end overlapping portion 32A. In this state, the four upper flaps 14 and 15 are maintained in a bent state, and the assembly operation of the packaging box 1 is completed.

<Upper flap engagement procedure (3)>
Further, in the above-described engagement procedure, the pair of adjacent upper flaps 14B and 15A are engaged with each other at one place, but the present invention is not limited to this. The adjacent upper flaps 14 and 15 are engaged at two places It is also good. As another example (engagement procedure (3)), as shown in FIG. 8, the upper flaps 14 and 15 which adjoin in two places of the diagonal part of the packaging box 1 (peripheral wall 1W) may be engaged. . The operator folds the first upper flap 14B, the second upper flap 15B, the first upper flap 14A, and the second upper flap 15A in this order. Thereafter, the operator grips and pulls up the tip of the first upper flap 14A located below the second upper flap 15A, and the first located below the second upper flap 15B. The tip of the upper flap 14B is gripped and pulled up. Then, the first upper flap 14A and the second upper flap 15A adjacent to each other insert the engagement recess 23A into the engagement recess 33A, superimpose the distal end overlapping portion 21A on the surface of the distal end overlapping portion 31A, and the proximal end The overlapping portions 32A are engaged with each other in a state where the overlapping portions 32A overlap the surface of the proximal end overlapping portion 22A. Similarly, the adjacent first upper flaps 14B and second upper flaps 15B are engaged with each other in a state in which the engagement recess 23B and the engagement recess 33B are engaged with each other. In this state, the four upper flaps 14 and 15 are engaged at two diagonal positions and maintained in a bent state. The first upper flap 14A and the second upper flap 15B may be engaged with each other and the first upper flap 14B may be engaged with the second upper flap 15A in the same manner as described above (see FIG. Not shown).

<Upper flap engagement procedure (4)>
As another example (engagement procedure (4)), as shown in Drawing 9, adjacent upper flaps 14 and 15 may engage in three places. The operator folds the first upper flap 14B, the second upper flap 15B, the first upper flap 14A, and the second upper flap 15A in this order. Thereafter, the operator grips and pulls up the tip of the first upper flap 14A located below the second upper flap 15A, and is located below the pair of second upper flaps 15A, 15B. The tip end of the first upper flap 14B is gripped and pulled up. As a result, the leading end overlapping portion 21A of the first upper flap 14A is superimposed on the surface of the leading end overlapping portion 31A of the second upper flap 15A, and the engagement recess 23A engages with the engagement recess 33A. In addition, the pair of front end overlapping portions 21B of the first upper flap 14B is superimposed on the surface of the end overlapping portions 31A and 31B of the pair of second upper flaps 15A and 15B, and the pair of engagement concave portions 23B is a pair of engagement The recesses 33A and 33B are engaged. In this state, the four upper flaps 14 and 15 are engaged at three points and maintained in the bent state. The three places to be engaged among the four upper flaps 14 and 15 can be arbitrarily selected without being limited to the above.

<Upper flap engagement procedure (5)>
Moreover, as another example (engagement procedure (5)), as shown in FIG. 10, adjacent upper flaps 14 and 15 may engage in four places. The operator folds the pair of second upper flaps 15A and 15B on the surface of the pair of first upper flaps 14A and 14B, and then grasps the tips of the pair of first upper flaps 14A and 14B. Pull up. The pair of first upper flaps 14A and 14B may be pulled up at the same time or may be pulled up separately. Then, the respective end overlapping portions 21A and 21B are superimposed on the surfaces of the respective end overlapping portions 31A and 31B, and the respective engagement recesses 23A and 23B engage with the respective engagement recesses 33A and 33B. In this state, the four upper flaps 14 and 15 are engaged at four places and maintained in the bent state. As shown in FIG. 11, after the operator folds the pair of first upper flaps 14A and 14B on the surface of the pair of second upper flaps 15A and 15B, the pair of second upper flaps 15A , 15B may be gripped and pulled up so that the respective end overlapping portions 31A, 31B overlap the surfaces of the respective end overlapping portions 21A, 21B.

  In the packaging box 1 which concerns on this embodiment described above, the four upper flaps 14 and 15 were respectively equipped with a pair of engagement structure 20,30. According to this configuration, at least one of the four adjacent upper flaps 14 and 15 is arbitrarily selected, and the selected upper flaps 14 and 15 are engaged by the engagement structures 20 and 30 (see FIG. Can be engaged. As a result, since the folding order (folding order) of the four upper flaps 14 and 15 becomes irrelevant in the assembly operation of the packaging box 1, it is possible to eliminate the possibility that the folding order of the four upper flaps 14 and 15 may be mistaken. . As a result, the operator can arbitrarily determine the folding order of the four upper flaps 14 and 15, and anyone can assemble the packaging box 1 easily and quickly regardless of the degree of skill of the operator.

  Moreover, in the packaging box 1 which concerns on this embodiment, it was set as the structure which the tip superposition | polymerization part 21 and 31 bends at the tip bending curve 24 and 34. FIG. According to this configuration, for example, in the process of pulling up the upper flap 14 (15) located below the upper flap 15 (14), the tip overlap portion 21 (31) of the upper flap 14 (15) Since it bends inward at (34), it is possible to reduce the force required to pull up the upper flap 14 (15) (tip overlapping portion 21 (31)). This allows the adjacent pair of upper flaps 14, 15 to be easily engaged (locked) with a small force.

  Further, in the packaging box 1 according to the present embodiment, the pair of tip end overlapping portions 21 and 31 are offset to the center side in the flow direction (second direction) than the pair of base end overlapping portions 22 and 32 so as to approach each other. The Further, the pair of tip bending curves 24 and 34 are inclined so as to approach each other from the proximal end side to the distal end side of the upper flaps 14 and 15, respectively. The projection dimension S1 of the leading end overlapping portions 21 and 31 is larger than the projection dimension S2 of the base end overlapping portions 22 and 32. According to this configuration, it is possible to secure the overlapping width of the leading end overlapping portions 21 and 31 in a state in which the adjacent upper flaps 14 and 15 are folded. Thereby, adjacent upper flaps 14 and 15 can be engaged firmly, and four upper flaps 14 and 15 can be maintained in the state where it was bent inside peripheral wall 1W.

[Modification]
In addition, in the packaging box 1 which concerns on this embodiment, although the four upper flaps 14 and 15 are what is called a half flap, and it is the structure which closes a part of upper surface opening of the surrounding wall 1W, this invention is limited to this I will not. As shown in FIG. 12, for example, in the packaging box 2 according to the modification of the present embodiment, the tip of the pair of second upper flaps 41A and 41B is pushed in the inside of the peripheral wall 2W, It may be formed in an extension dimension that fits. In this case, it is preferable to adjust the extension dimensions of the pair of first upper flaps 40A and 40B in accordance with the extension dimensions of the pair of second upper flaps 41A and 41B. In the packaging box 2, the upper opening of the peripheral wall 2 </ b> W is closed by the four upper flaps 40 and 41.

  In the packaging boxes 1 and 2 according to the present embodiment (including the modified example, the same applies to the following), four pairs of engagement structures 20A, 20B, 21A and 21B are formed on the four upper flaps 14 and 15, respectively. Although the present invention is not limited thereto. For example, the engagement structures 20, 21 may be formed on the lower flaps 12, 13 instead of / in addition to the respective upper flaps 14, 15.

  Further, in the packaging boxes 1 and 2 according to the present embodiment, the leading end overlapping portions 21 and 31 and the proximal end overlapping portions 22 and 32 have a substantially quarter circular shape by curving the ends. The present invention is not limited to this. For example, the distal end overlapping portions 21 and 31 and the proximal end overlapping portions 22 and 32 may be formed in various shapes (not shown) such as a quarter oval shape, a triangle shape, a square shape or a trapezoidal shape.

  Further, in the packaging boxes 1 and 2 according to the present embodiment, the engagement concave portions 23 and 33 are depressions between the leading end overlapping portions 21 and 31 and the proximal end overlapping portions 22 and 32, but the present invention It is not limited. For example, the engagement recess may include a slit cut from a recess between the distal end overlapping portions 21 and 31 and the proximal end overlapping portions 22 and 32 (not shown).

  Moreover, in the packaging boxes 1 and 2 which concern on this embodiment, although the front-end curve 24 and 34 was a general purpose ruled line, this invention is not limited to this. For example, the front end bending line may be any line for bending a corrugated cardboard sheet so that the back liner 9C is directed inward, such as a leaded crease in which a plurality of incisions are formed substantially at regular intervals on a general-purpose crease (see FIG. Not shown). In addition, the front end folding line may be a reverse ruled line or the like formed by crushing a corrugated cardboard sheet in a straight line in the thickness direction from the front liner 9B side (not shown). Since such a tip curve has a function of bending the corrugated sheet so that the front liner 9B is directed inward, in the process of pulling up the upper flap 14 (15) located below the upper flap 15 (14), The leading end overlapping portion 31 (21) of the upper flap 15 (14) is bent outward (upper side) at the leading end bending curve 34 (24). Even in this case, it is possible to obtain the same effect as described above, such as reducing the force required to pull up the upper flap 14 (15) (the leading end overlapping portion 21 (31)).

  Further, in the packaging boxes 1 and 2 according to the present embodiment, the vertical folding curve L1, the lower folding curve L2, the upper folding curve L3 and the like are general ruled lines, but the invention is not limited thereto. Good.

  The shapes and sizes (dimensions) of the packaging boxes 1 and 2 according to the present embodiment are an example, and can be appropriately changed according to the shapes and sizes of contents. The lower inner flap 12 and the lower outer flap 13 may be omitted, and the peripheral walls 1W and 2W may be disposed along the edge of one bottom wall. In addition, the packaging boxes 1 and 2 have peripheral walls 1W and 2W having a substantially rectangular cylindrical shape (substantially rectangular cross section), but the present invention is not limited to this. And at least four flaps may be provided in series at the end of the peripheral wall.

  Moreover, although the packaging boxes 1 and 2 which concern on this embodiment were formed with the paper-made double-sided corrugated sheet, this invention is not limited to this. For example, the corrugated sheet may be a single-sided corrugated sheet in which a liner is attached to one side of the inner core 9A, or a double-sided corrugated sheet in which a single-sided corrugated sheet is bonded to a double-sided corrugated sheet. Further, for example, the packaging box 1 may be formed of a cardboard, a plate made of a resin, or the like, instead of a cardboard sheet made of paper.

  The description of the above embodiment shows one aspect of the packaging box according to the present invention, and the technical scope of the present invention is not limited to the above embodiment.

1, 2 Packaging box 1W, 2W Peripheral wall 10A, 10B End wall 11A, 11B Side wall 14A, 14B, 40A, 40B First upper flap (flap)
15A, 15B, 41A, 41B second upper flap (flap)
20A, 20B, 30A, 30B engagement structure 21A, 21B, 31A, 31B tip end overlapping portion 22A, 22B, 32A, 32B base end overlap portion 23A, 23B, 33A, 33B engagement recess 24A, 24B, 34A, 34B tip end folding Curve L1 Longitudinal Curve (1st Curve)
L3 upper bending line (second bending line)
S1, S2 Protrusion dimension V Virtual line

Claims (4)

A peripheral wall (1W, 2W) formed in a cylindrical shape with an open end face,
Four flaps (14A, 14B, 15A, 15B, 40A, 40B, 41A, 41B) which are connected to the end of the peripheral wall and close at least a part of the opening of the peripheral wall in a state of being bent inside the peripheral wall And
A pair of engagement structures (20A, 20B, 30A, 30B) are formed on both sides of each of the flaps,
Each said engagement structure is
A tip overlap portion (21A, 21B, 31A, 31B) formed at a tip corner of the flap;
A proximal polymerization portion (22A, 22B, 32A, 32B) formed adjacent to the distal end polymerization portion on the proximal end side of the flap;
And an engagement recess (23A, 23B, 33A, 33B) formed between the leading end polymerization portion and the base end polymerization portion,
The pair of adjacent flaps inserts one of the engagement recesses into the other of the engagement recesses, superimposes one of the distal end polymerization portions on the surface of the other of the distal end polymerization portions, and the other of the proximal end polymerizations. Parts are engaged with each other with the parts overlapping one another on the surface of the proximal end polymerization part,
A packaging box characterized in that the four flaps are maintained in a bent state inside the peripheral wall by engaging one another of at least one adjacent pair of the flaps among the four flaps with each other.   2. The apparatus according to claim 1, wherein each of the engagement structures includes a tip folding curve (24A, 24B, 34A, 34B) formed on the flap to fold the tip overlapping portion. Packaging box. The leading end polymerization portion is formed at a position shifted to the center side of the flap with respect to the base end polymerization portion,
The tip bending curve is formed to be inclined toward the center of the flap from the proximal side to the distal side of the flap,
The projecting dimension (S1) of the distal end polymerizing portion from the distal end bending curve is greater than the projecting dimension (S2) of the proximal end polymerizing portion from an extension line extending the distal end bending curve toward the proximal end polymeric portion. The packaging box according to claim 2, characterized in that it is set long. The peripheral wall is formed by connecting four walls (10A, 10B, 11A, 11B) via a first fold line (L1) extending in the first direction,
The flap is connected to the peripheral wall via a second fold line (L3) extending in a second direction orthogonal to the first direction,
The tip bend is formed on an imaginary line (V) extending at an oblique angle of 45 degrees from the intersection of the first bend and the second bend to the tip of the flap. The packaging box according to claim 3.

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