JP2018070187A - Packing box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packing box in which simple sealing work is guaranteed and a sealed condition is maintained.SOLUTION: The present invention is a packing box 1 in which a pair of side surface plates 11 and a pair of end surface plates 12 are stood at a bottom plate, and comprises an inner flap 13 and an outer flap 14 which are consecutively provided at tips of the side surface plate 11 and the end surface plate 12, engagement holes 20 which are formed at the inner flap 13, returning-restricting pieces 21 which are formed so as to make a part of the engagement hole 20 openable and closable, and engagement pieces 23 which are formed at the outer flaps 14 as insertable into the engagement holes 20. The outer flap 14 is constructed as slidable between an insertion position at which the engagement piece 23 is inserted into the engagement hole 20 while the returning-restricting piece 21 is folded and bent and a lock position at which the inner flap 13 is relatively moved into an engagement groove 24 of the engagement piece 23 under a condition of being superimposed to the outside of the pair of the inner flaps 13, and the returning- restricting piece 21 contacts the engagement piece 23 so as to restrict sliding of the outer flap 14 under a condition that the outer flap 14 is arranged at the lock position.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a packaging box for packaging merchandise.

  In recent years, an increasing number of customers purchase products through mail order sales. As packaging boxes for packaging products, packaging boxes that can be sealed without using tapes or adhesives are used.

  For example, the paper box described in Patent Literature 1 includes a pair of inner cover paper and a pair of outer cover paper that form a lid of the box. In each inner cover paper, a slot is formed along the crease line between each inner cover paper and each side paper. Each outer cover paper is formed with a tongue piece, a presser paper, and an insertion piece. To form the box lid, the outer cover papers are stacked on the outer side (upper side) of the inner cover papers. Also, one presser paper is stacked on the upper side of the other tongue piece, and the other presser paper is stacked on the upper side of the one tongue piece. Then, each insertion piece is inserted into each slot while bending each presser paper outward.

Japanese Utility Model Publication No. 53-110320

  In the paper box described above, each insertion piece could be extracted from each slot simply by bending each presser paper outward. Therefore, for example, when an external force that warps the presser paper is applied during transportation, the paper box is unintentionally opened.

  In order to solve the above-described problems, the present invention provides a packaging box that secures a simple sealing operation and maintains the sealed state.

  In order to achieve the above-described object, the present invention is a packaging box including a pair of first side plates and a pair of second side plates that are alternately erected on the four sides of the bottom, and the pair of first sides A pair of inner receiving plates connected to the tip of the face plate via a first folding line, and a tip of at least one of the pair of second side plates connected to the tip of the second side plate via a second folding line. A fixing plate, an engagement hole formed in the inner receiving plate along the first folding line, and a continuous folding line on the first side plate or the inner receiving plate via a regulation folding line. A return restricting piece that is partly openable and closable, and an engagement piece that is connected to the fixing plate via an engagement fold line and that can be inserted into the engagement hole. The joining piece has an engaging groove that is cut from the distal end side to the proximal end side of the fixing plate along the engagement folding line, and the fixing plate is the second folding line. The folding plate overlaps the outside of the pair of inner receiving plates bent at the first folding line, and the fixing plate overlaps the outer side of each inner receiving plate while bending the return regulating piece at the regulating folding line. Slidable between an insertion position where the engagement piece is inserted into the engagement hole and a locking position where the inner receiving plate is relatively moved into the engagement groove of the engagement piece. In the state where the fixing plate is arranged at the locking position, the return regulating piece abuts on the engaging piece and regulates the sliding of the fixing plate from the locking position toward the insertion position. To do.

  In this case, the engagement hole is formed to gradually narrow the opening width from the upstream side to the downstream side in the locking direction set from the insertion position toward the locking position, and the return It is preferable that the restricting piece is provided on the upstream side of the engaging hole in the locking direction.

  In this case, the fixing plates are respectively connected to the pair of second side plates, and the engagement pieces are formed at both ends in the width direction parallel to the second folding line at the fixing plates, It is preferable that a pair of engaging holes is formed in each inner receiving plate so as to be spaced apart in the length direction parallel to the first folding line.

  In this case, it is further provided with a pair of inner hooks that are connected to the tips of the pair of inner receiving plates and are formed to be able to engage with each other in a state where the pair of inner receiving plates are folded along the first folding line. Is preferred.

  According to the present invention, the packaging box can be easily sealed and the state where the packaging box is sealed can be maintained.

It is a perspective view which shows the packaging box which concerns on one Embodiment of this invention. It is a top view which shows the blank of the packaging box which concerns on one Embodiment of this invention. It is a perspective view which shows the assembly process (first half) of the packaging box which concerns on one Embodiment of this invention. It is a perspective view which shows the assembly process (middle board) of the packaging box which concerns on one Embodiment of this invention. It is a perspective view which shows the assembly process (latter half) of the packaging box which concerns on one Embodiment of this invention. It is sectional drawing which shows the periphery of the engagement piece in the assembly process of the packaging box which concerns on one Embodiment of this invention. It is sectional drawing which shows the periphery of the engagement piece at the time of sealing of the packaging box which concerns on one Embodiment of this invention. It is a top view which shows the blank of the packaging box which concerns on the modification of one Embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In this specification, terms indicating directions and positions (for example, terms including up, down, left, right, etc.) are used, but these terms do not limit the technical scope of the present invention.

  With reference to FIG. 1 and FIG. 2, the packaging box 1 which concerns on this embodiment is demonstrated. FIG. 1 is a perspective view showing the packaging box 1. FIG. 2 is a plan view showing the blank 2 of the packaging box 1.

  As shown in FIG. 1, the packaging box 1 is formed in a rectangular parallelepiped shape that is flat in the vertical direction. The packaging box 1 has a rectangular tube shape in which a pair of side plates 11 (first side plates) and a pair of end surface plates 12 (second side plates) are alternately erected on four sides of a bottom plate 10 (see FIG. 2). The peripheral wall portion 1W is included. The packaging box 1 is a so-called tatto-type box that is sealed by sealing the upper surface of the peripheral wall portion 1W with each outer flap 14 or the like.

  As shown in FIG. 2, the packaging box 1 is formed by assembling a blank 2 obtained by punching a piece of paper cardboard with a paper punching device. The cardboard is, for example, a well-known one in which a front liner 2b and a back liner 2c (see FIG. 3) are bonded to both front and back surfaces of a corrugated shin 2a. FIG. 2 shows the front liner 2b side (the outer surface side of the packaging box 1). In the present specification, a direction parallel to the center ridge 2a of the cardboard is referred to as a “step direction”, and a direction orthogonal to the step direction is referred to as a “flow direction”. “Stage direction” is an example of “width direction” in the claims, and “flow direction” is an example of “length direction” in the claims. In each figure, “X” indicates “stage direction” and “Y” indicates “flow direction”.

  The blank 2 includes a bottom plate 10, a pair of side plates 11, a pair of end plates 12, a pair of inner flaps 13, a pair of outer flaps 14, a pair of folding partition plates 15, and four corner flaps 16. And.

  In FIG. 2, the pair of side plates 11, the pair of inner flaps 13, and the pair of folding partition plates 15 are disposed symmetrically with respect to the bottom plate 10. The bottom plate 10, the side plates 11, and the inner flaps 13 are each formed in a rectangular plate shape having the same length in the flow direction. The pair of end face plates 12 and the pair of outer flaps 14 are arranged symmetrically with respect to the bottom plate 10 in FIG. The bottom plate 10, the end plates 12 and the outer flaps 14 are each formed in a rectangular plate shape having the same length in the step direction.

  The bottom plate 10 as an example of the bottom is formed in a rectangular shape that is long in the flow direction when viewed from the plane. The bottom plate 10 is not limited to a rectangle, and may be formed in a polygon having four or more apexes such as an octagon.

  The pair of side plates 11 as an example of the first side plate are connected to both ends of the bottom plate 10 in the step direction via bottom fold lines L1. The dimension in the step direction of each side plate 11 is set shorter than the dimension in the step direction of the bottom plate 10. The pair of end face plates 12 as an example of the second side face plate are connected to both ends of the bottom face plate 10 in the flow direction via bottom fold lines L1. The dimension of each end face plate 12 in the flow direction is set to be shorter than the dimension of the bottom face plate 10 in the flow direction.

  The pair of inner flaps 13 as an example of the inner receiving plate is connected to the tips of the pair of side plates 11 (upper end during assembly) via the first folding line L2. The dimension in the step direction of each inner flap 13 is set to be not less than the dimension in the step direction of the side plate 11 and not more than the dimension in the step direction of the bottom plate 10. Since the pair of inner flaps 13 are arranged symmetrically in FIG. 2, only one (for example, the left side in FIG. 2) inner flap 13 will be described below.

  The inner flap 13 is formed with a pair of engagement holes 20 and a pair of return regulating pieces 21. The pair of engagement holes 20 are formed in the inner flap 13 along the first folding line L2. The pair of return restriction pieces 21 are connected to the inner flap 13 via a restriction fold line L3, and are formed so that a part of the engagement hole 20 can be opened and closed.

  The pair of engagement holes 20 (the pair of return regulating pieces 21) are formed in the inner flap 13 so as to be separated from each other in the flow direction. The pair of engagement holes 20 (a pair of return restricting pieces 21) are formed symmetrically about a horizontal line that bisects the blank 2 in FIG. In the following, one (for example, the lower left side in FIG. 2) engagement hole 20 and one return regulating piece 21 will be described for the sake of simplicity. Enlarged engagement holes 20 and return restricting pieces 21 are shown inside an ellipse indicated by a two-dot chain line in FIG.

  As shown in the ellipse in FIG. 2, the engagement hole 20 is formed in a substantially rectangular (substantially trapezoidal) shape. The first opening edge 20a of the engagement hole 20 extends along the first fold line L2. The first opening edge 20 a is formed as a cut for constituting the return regulating piece 21. The 2nd opening edge 20b of the engagement hole 20 is formed in the position which entered the inner flap 13 side rather than the 1st broken line L2. The second opening edge 20b is formed substantially opposite to the first opening edge 20a on the inner side in the flow direction of the engagement hole 20. The second opening edge 20b is inclined and extended toward the first folding line L2 from the outer side in the flow direction toward the inner side (center). Therefore, the engagement hole 20 is formed so that the opening width becomes narrower from the outer side in the flow direction toward the inner side (center).

  The return restriction piece 21 is formed in a substantially rectangular shape by making a cut in the inner flap 13 while leaving the restriction folding line L3. The regulation folding line L3 is formed in parallel with the first folding line L2 (first opening edge 20a) on the outer side in the flow direction than the second opening edge 20b. The return regulating piece 21 is provided so as to close the outer side of the engagement hole 20 in the flow direction. Further, the return regulating piece 21 is bent around the regulation folding line L3 and opens the outer side in the flow direction of the engaging hole 20.

  As shown in FIG. 2, the pair of outer flaps 14 as an example of the fixed plate is connected to the tips of the pair of end face plates 12 (upper end during assembly) via a second folding line L4. The dimension in the flow direction of each outer flap 14 is set to be not less than the dimension in the flow direction of the end face plate 12 and not more than the dimension in the flow direction of the bottom plate 10. On one outer flap 14 (lower side in FIG. 2), a zipper 22 for opening is formed along the step direction. Since the pair of outer flaps 14 are arranged symmetrically in the vertical direction in FIG. 2, one (for example, the lower side in FIG. 2) outer flap 14 will be described below.

  A pair of engaging pieces 23 are formed at both ends of the outer flap 14 in the step direction. The pair of engagement pieces 23 are connected to each other through the engagement fold line L5 at the approximate center of the outer flap 14 in the flow direction. The pair of engagement pieces 23 are formed to be insertable into the pair of engagement holes 20. The pair of engagement pieces 23 are formed symmetrically with respect to the outer flap 14 in FIG. Hereinafter, mainly one (for example, the lower left side in FIG. 2) engagement piece 23 will be described.

  The engagement piece 23 has an engagement groove 24 that is cut from the distal end side (downward) to the proximal end side (upward) of the outer flap 14 along the engagement folding line L5. The engagement piece 23 is formed in a substantially L shape bent from the root portion 23 a connected to the outer flap 14 to the distal end side of the outer flap 14. A corner portion on the outer side (left side) in the step direction of the engagement piece 23 is chamfered to form an arc shape (R shape). Also, the tip corners of the engagement pieces 23 constituting the engagement grooves 24 are chamfered and inclined.

  The total length D1 of the engagement piece 23 in the flow direction is set to be slightly smaller than the total length D2 of the engagement hole 20 (first opening edge 20a) in a state where the return regulating piece 21 is opened. The length D10 in the flow direction of the base portion 23a of the engagement piece 23 (the length of the engagement folding line L5) is set to be approximately the same value as the length D20 of the engagement hole 20 in a state where the return restriction piece 21 is closed. ing.

  The pair of folding partition plates 15 are connected to the tips of the pair of side plates 11 via a first folding line L6. The pair of folding partition plates 15 is formed in a trapezoidal shape that gradually decreases in the flow direction toward both outer sides in the step direction. The dimension in the step direction of each folding partition plate 15 is set to be not less than the dimension in the step direction of the inner flap 13 and not more than the dimension in the step direction of the bottom plate 10. Since the pair of folding partition plates 15 are arranged symmetrically in FIG. 2, only one (for example, the left side in FIG. 2) folding partition plate 15 will be described below.

  In the folding partition plate 15, a first folding line L6, a second folding line L7, and a third folding line L8 are formed in order from the proximal end to the distal end. The first to third folding lines L6 to L8 are arranged in parallel to each other and at substantially equal intervals in the step direction. The distance between the first folding line L6 and the second folding line L7 is set to be substantially the same as the dimension of the side plate 11 in the step direction. Similarly, the distance between the second folding line L7 and the third folding line L8 is set to be approximately the same as the dimension of the side plate 11 in the step direction. In addition, the distance from the 3rd folding line L8 to the front-end | tip of the folding partition plate 15 is set shorter than the dimension of the step direction of the side surface board 11. FIG.

  An inner hook 25 is formed at the center in the flow direction of each folding partition plate 15. The inner hook 25 is formed in a substantially trapezoidal shape by making a cut in the folding partition plate 15 leaving the boundary with the inner flap 13. The inner hook 25 is connected to the tip of the inner flap 13 and extends to the vicinity of the third folding line L8. Note that the first folding line L6 is not formed at the boundary between the inner hook 25 and the inner flap 13.

  Each inner hook 25 has an engagement recess 26 cut from one end (upper end) in the flow direction to the other (lower). The inner hook 25 is formed with a hook fold line L9 extending obliquely downward to the left from the end of the engaging recess 26. In FIG. 2, the pair of left and right inner hooks 25 are formed on the folding partition plate 15 so as to be point-symmetric about the center point of the bottom plate 10. Although details will be described later, the pair of inner hooks 25 are formed so as to be able to engage with each other in a state in which the pair of inner flaps 13 are bent along the first folding line L2.

  The four corner flaps 16 are connected to both ends of each side plate 11 in the flow direction via corner fold lines L10. Each corner flap 16 is formed in a substantially rectangular shape.

  The bottom fold line L1, the first fold line L2, the regulation fold line L3, the second fold line L4, the engagement fold line L5, the first to third fold lines L6 to L8, the hook fold line L9 and the corner fold line L10 are respectively the back liner 2c. It is a ruled line crushed linearly in the thickness direction from the side. Note that these folding lines L1 to L10 are not limited to ruled lines, and may be, for example, sewing lines in which cuts are continuous at equal intervals, or leads in which ruled lines and cuts are alternately continued. It may be a ruled line.

  Next, the assembly process (sealing process) of the packaging box 1 will be described with reference to FIGS. FIG. 3 is a perspective view showing an assembly process (first half) of the packaging box 1. FIG. 4 is a perspective view showing an assembly process (middle stage) of the packaging box 1. FIG. 5 is a perspective view showing the assembly process (second half) of the packaging box 1. FIG. 6 is a cross-sectional view showing the periphery of the engaging piece 23 in the assembly process of the packaging box 1. FIG. 7 is a cross-sectional view showing the periphery of the engaging piece 23 when the packaging box 1 is sealed.

  The packaging box 1 is assembled by appropriately bending the blank 2 with the back liner 2c facing upward. First, the operator bends the pair of side plates 11 substantially at right angles along the bottom fold line L1, and bends the pair of folding partition plates 15 so as to be wound inside (see FIG. 3). FIG. 3 shows a state in which each folding partition plate 15 is folded along all the folding lines L6 to L8. The folding partition plate 15 may not be bent at the third folding line L8 (see FIG. 2). In addition, each folding partition plate 15 may be folded along the second and third folding lines L7 and L8 without being folded along the first folding line L6. Further, for example, any one of the pair of folding partition plates 15 may be bent at all the folding lines L6 to L8, and either one may be bent at the second and third folding lines L7 and L8.

  Next, as shown in FIG. 3, the operator bends the pair of inner flaps 13 along the first folding line L2 at a substantially right angle. In this state, the front end portion of each folding partition plate 15 comes into contact with the bottom plate 10, and a portion between the first folding line L 6 and the second folding line L 7 is erected facing the side plate 11. Each inner flap 13 faces the upper side of the bottom plate 10 and is supported in a posture substantially parallel to the bottom plate 10. Subsequently, the operator engages the pair of engaging recesses 26 while bending the tip ends of the pair of inner hooks 25 along the hook fold line L9. By engaging the pair of inner hooks 25, the side plates 11, the inner flaps 13, and the folding partition plates 15 are maintained in a folded state. Thereby, return of each inner flap 13 etc. is prevented, and the assembly operation | work of the packaging box 1 after this, the packaging operation | work of goods, etc. can be performed efficiently.

  In this state, each face plate 10, 11, each inner flap 13, and each folding partition plate 15 constitute a storage tube portion S 1 having a substantially rectangular tube shape. A pair of storage cylinder part S1 is comprised in the step direction both outer side of the bottom face board 10 on both sides of center storage part S2. The operator inserts (arranges) a product (not shown) from each end in the flow direction into each storage cylinder S1 or the central storage S2.

  Next, as shown in FIG. 4, the operator folds each corner flap 16 inward at a corner fold line L10, and bends each end face plate 12 at a substantially right angle along the bottom fold line L1. Thereby, the peripheral wall part 1W is comprised in the periphery of the bottom face board 10. FIG. Further, the worker bends each engagement piece 23 along the engagement fold line L5 at a substantially right angle.

  Next, as shown in FIG. 5, the worker bends at substantially right angles along the second fold line L <b> 4 so that the outer flaps 14 overlap the upper surface (outer side) of the inner flaps 13. At this time, the operator bends each outer flap 14 so as to insert the pair of engagement pieces 23 into the pair of engagement holes 20. Hereinafter, for convenience of description, the description will be made with attention paid to one outer flap 14, one engagement piece 23, and one engagement hole 20.

  The engagement piece 23 abuts on the return restriction piece 21 with a part of the engagement hole 20 closed, and pushes down the return restriction piece 21. Then, as illustrated in FIG. 6, the outer flap 14 is disposed at the insertion position P <b> 1 in which the engagement piece 23 is inserted into the engagement hole 20 while the return restriction piece 21 is bent along the restriction fold line L <b> 3. The outer flap 14 is overlapped with the upper surfaces (outside) of the pair of inner flaps 13.

  Subsequently, the operator slides the outer flap 14 disposed at the insertion position P1 toward the flow direction center side (locking direction) (see the broken line arrow in FIG. 6). Then, as shown in FIG. 7, the outer flap 14 is disposed at a locking position P <b> 2 in which the inner flap 13 is relatively entered into the engagement groove 24 of the engagement piece 23. That is, when the outer flap 14 is disposed at the locking position P <b> 2, the end edge 20 c on the downstream side in the locking direction of the engagement hole 20 is fitted into the engagement groove 24. Thus, the outer flap 14 is configured to be slidable between the insertion position P1 and the locking position P2.

  In the state where the outer flap 14 is disposed at the locking position P <b> 2, the end of the engagement groove 24 abuts against the end edge 20 c of the engagement hole 20. As described above, the return regulating piece 21 is provided on the upstream side of the engagement hole 20 in the locking direction. The root portion 23 a of the engagement piece 23 is disposed on the downstream side in the locking direction with respect to the return restriction piece 21 inside the engagement hole 20. Since the engagement piece 23 releases the push-down of the return restriction piece 21, the return restriction piece 21 is displaced by the elastic force (restoring force) of the cardboard itself so as to close the upstream side in the locking direction of the engagement hole 20 (originally Return). Accordingly, the root portion 23 a of the engagement piece 23 is sandwiched between the end edge 20 c of the engagement hole 20 and the return restriction piece 21. In other words, the return regulating piece 21 is disposed in the engagement hole 20 in a state of being in contact with the engagement piece 23. The return restricting piece 21 restricts the sliding of the outer flap 14 from the locking position P2 toward the insertion position P1.

  As described above, the outer flap 14 is fixed in a state of being overlapped on the upper surfaces of the pair of inner flaps 13 via the engagement pieces 23, and the assembly work of the packaging box 1 is completed. In this state, the packaging box 1 is sealed without using a tape or an adhesive (see FIG. 1). The packaging box 1 is opened by tearing the zipper 22 formed on the outer flap 14.

  According to the packaging box 1 according to the present embodiment described above, the outer flap 14 is slid so that the inner flap 13 is fitted into the engaging groove 24 after the engaging piece 23 is inserted into the engaging hole 20. This closes the upper surface of the peripheral wall 1W. That is, the packaging box 1 is sealed by moving in the horizontal direction after moving the outer flap 14 downward. In this state, since the engagement piece 23 is inhibited from sliding by the return regulating piece 21, the outer flap 14 is displaced to the locking position P <b> 2 (the inner flap 13 (end edge 20 c) is fitted in the engagement groove 24. Maintained). Thereby, for example, even if a force to rotate upward is applied to the outer flap 14, the rotation of the outer flap 14 can be prevented. Further, for example, even if a force for sliding the outer flap 14 in the releasing direction (the direction from the locking position P2 toward the insertion position P1) acts, the sliding of the outer flap 14 can be prevented. By the above, the state which sealed the packaging box 1 can be maintained, without the engagement piece 23 being pulled out from the engagement hole 20. FIG.

  The above-described engagement hole 20 is formed so as to gradually narrow the opening width from the upstream side to the downstream side in the locking direction. According to this configuration, since the engagement hole 20 has a wide opening width on the upstream side in the locking direction, the insertion operation of the engagement piece 23 can be performed smoothly. Further, since the engagement hole 20 is formed to become narrower gradually from the upstream side in the locking direction toward the downstream side, the slide toward the locking direction of the engagement piece 23 can be guided. Further, an appropriate portion of the inner flap 13 (downstream end edge of the engagement hole 20 in the locking direction) can be fitted into the engagement groove 24.

  Moreover, according to the packaging box 1 which concerns on this embodiment, the state which sealed the packaging box 1 by making each outer flap 14 latch to a pair of inner flap 13 by the several (a pair of) engagement piece 23 is. Can be maintained properly.

  In addition, in the packaging box 1 which concerns on this embodiment, although each return regulation piece 21 was connected with the inner flap 13, this invention is not limited to this. As shown in FIG. 8, as a packaging box 3 (blank 4) according to a modification, the side plates 11 are connected to each other via a regulation folding line L11 so that the upstream side in the locking direction of the engagement hole 20 can be opened and closed. The four return regulating pieces 30 are provided. Each return regulation piece 30 is formed in a substantially rectangular shape by making a cut in the inner flap 13 while leaving the regulation folding line L11. Each regulation folding line L11 constitutes a part of the first folding line L2. Each return regulating piece 30 is provided extending from the regulation folding line L11 to a position exceeding the second opening edge 20b. According to the packaging box 3 according to this modification, the same actions and effects as those of the packaging box 1 described above can be obtained.

  In addition, although the packaging boxes 1 and 3 which concern on this embodiment (A modification is included. The following is the same.) Were provided with a pair of engagement piece 23 (engagement hole 20), this invention is limited to this. Not. One or more engagement pieces 23 and engagement holes 20 may be formed, and two or more engagement pieces 23 and engagement holes 20 may be formed.

  In addition, although the packaging boxes 1 and 3 which concern on this embodiment were provided with a pair of outer flap 14, this invention is not limited to this. The outer flap 14 only needs to be connected to at least one end face plate 12 of the pair of end face plates 12. For example, one outer flap 14 may be connected to one of the pair of end face plates 12 to close the upper surface of the peripheral wall portion 1W. In this case, it is preferable that a flap (not shown) that overlaps the inside of the outer flap 14 is connected to either one of the pair of end face plates 12. Moreover, although the packaging boxes 1 and 3 which concern on this embodiment were provided with a pair of folding partition plate 15, a pair of folding partition plate 15 may be abbreviate | omitted.

  In addition, although the packaging boxes 1 and 3 which concern on this embodiment were what is called a corrugated cardboard box of a so-called type (Yakko type), this invention is not limited to this. For example, the present invention may be applied to packaging boxes (not shown) such as A-type, B-type, and N-type, instead of the cardboard box of the type. Further, for example, the present invention may be applied to a tray-shaped packaging box (not shown) that accommodates vegetables and the like. In these cases, the “bottom part” in the claims refers to a part that becomes the bottom surface in a state where the packaging box is assembled.

  In addition, although the packaging boxes 1 and 3 which concern on this embodiment were formed with the paper cardboard as an example, this invention is not limited to this. For example, instead of paper cardboard, resin cardboard may be used, or a single cardboard or resin sheet may be used.

  In addition, description of the said embodiment shows the one aspect | mode in the packaging box which concerns on this invention, Comprising: The technical scope of this invention is not limited to the said embodiment. The components in the above embodiment can be appropriately replaced or combined with existing components and the like, and the description of the above embodiment does not limit the content of the invention described in the claims. .

1,3 Packaging box 10 Bottom plate (bottom)
11 Side plate (first side plate)
12 End plate (second side plate)
13 Inner flap (inner plate)
14 Outer flap (fixed plate)
20 Engagement hole 21 Return restriction piece 23 Engagement piece 24 Engagement groove 25 Inner hook L2 First folding line L3 Restriction folding line L4 Second folding line L5 Engagement folding line P1 Insertion position P2 Locking position

Claims (4)

A packaging box (1, 3) including a pair of first side plates (11) and a pair of second side plates (12) that are alternately erected on the four sides of the bottom (10),
A pair of inner receiving plates (13) connected to the ends of the pair of first side plates via a first folding line (L2);
A fixing plate (14) connected to the tip of at least one second side plate of the pair of second side plates via a second fold line (L4);
An engagement hole (20) formed in the inner support plate along the first folding line;
A return regulating piece (21) that is connected to the first side plate or the inner receiving plate via a regulation folding line (L3), and is formed to be able to open and close a part of the engagement hole;
An engagement piece (23) connected to the fixing plate via an engagement folding line (L5) and formed to be insertable into the engagement hole;
The engagement piece has an engagement groove (24) cut from the distal end side to the proximal end side of the fixed plate along the engagement fold line,
The fixing plate overlaps the outside of the pair of inner receiving plates bent at the first fold line by being bent at the second fold line,
In the state where the fixing plate overlaps the outside of each inner receiving plate, an insertion position (P1) in which the engagement piece is inserted into the engagement hole while the return restriction piece is bent along the restriction folding line; The inner receiving plate is configured to be slidable between a locking position (P2) in which the inner receiving plate relatively enters the engaging groove of the engaging piece,
In a state where the fixing plate is arranged at the locking position, the return regulating piece abuts on the engaging piece and regulates the sliding of the fixing plate from the locking position toward the insertion position. Characteristic packaging box. The engagement hole is formed so as to gradually narrow the opening width from the upstream side to the downstream side in the locking direction set from the insertion position toward the locking position,
The packaging box according to claim 1, wherein the return regulating piece is provided upstream of the engagement hole in the locking direction. The fixing plate is connected to each of the pair of second side plates,
A pair of the engaging pieces are formed at both ends in the width direction that are parallel to the second fold line in each of the fixing plates,
3. The packaging box according to claim 1, wherein a pair of the engaging holes are formed in the inner receiving plates so as to be separated from each other in a length direction parallel to the first folding line.   A pair of inner hooks (25) that are connected to the ends of the pair of inner receiving plates and are formed to be engageable with each other when the pair of inner receiving plates are folded along the first folding line; The packaging box according to any one of claims 1 to 3.

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