JP2014061930A - Packing box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packing box in which a top surface is configured by one piece of plate and which can prevent a situation where the top surface of the packing box opens unexpectedly, without adhering the top surface and a box body.SOLUTION: A packing box 100 includes: a pair of right and left folding pieces 16 and 17; a pair of right and left locking holes 16a and 17a; and a pair of right and left locking pieces 22 and 23. The pair of right and left folding pieces 16 and 17 are extended on a side forming an upper opening A of a left side surface plate 13 and a right side surface plate 14, and they are folded toward inside of the packing box 100. The pair of right and left locking holes 16a and 17a are provided at the pair of right and left folding pieces 16 and 17, and they are formed toward a tip side from the side where the pair of right and left folding pieces 16 and 17 are extended. The pair of right and left locking pieces 22 and 23 are extended on right and left both side edges of a top surface plate 21, and they fit with the pair of right and left locking holes 16a and 17a when the upper opening A is closed by the top surface plate 21.

Description

  The present invention relates to a packaging box formed of paper cardboard or the like. More specifically, the present invention relates to a packaging box in which the top surface is difficult to open and the top surface of the package is not easily damaged without using a bonding or adhesive member when the top surface is closed.

2. Description of the Related Art Conventionally, it is known that a package is stored and protected in a packaging box formed of cardboard or the like. A typical packaging box has a bottom surface, a side surface standing around the bottom surface, and a top surface connected to a part of the upper edge of the side surface. With the side surfaces standing around the bottom, an opening is formed in the upper part of the packaging box, and the upper opening is closed by the top surface.
The top surface may be composed of a plurality of plates as in the A-type box, but may be composed of a single plate. When there is only one top surface, there is no step on the inside of the top surface of the packaging box, and therefore there is an advantage that the top surface of the package is not easily damaged when the packages are placed and stacked.
Moreover, in a general packaging box, an insertion piece that is bent toward the inside of the packaging box is extended at the top of the top surface, and this insertion piece is inserted into the packaging box to It is designed to be fixed in a closed state.
In addition, a structure is known in which an insertion piece is attached to the box body in order to prevent the top surface of the packaging box from opening at an unintended timing when the packaging box is transported.

  In addition, in a packaging box in which the insertion piece is bonded to a box body, a technique for facilitating an operation of taking out a package through an upper opening is conventionally known (for example, Patent Document 1).

  For example, in the packaging box described in Patent Document 1, a score line is provided around the pasted portion of the front side plate. And when opening the packaging box of patent document 1, with the insertion piece provided at the tip of the top surface, the pasted portion of the front side plate surrounded by the score line is pushed inward from the outside, The sticking part is cut | disconnected from a front side board along a score line. At this time, since the portion separated from the front side plate is integrated with the insertion piece, the insertion piece can be separated from the front side plate and opened.

  As described above, the conventional packaging box basically has a structure assuming that the package is taken out from the opening provided in the upper part of the packaging box. The conventional packaging box has been devised to facilitate the opening of the top plate that closes the upper opening in order to facilitate the work of taking out the package.

Japanese Utility Model Publication No. 47-8527

  However, if the structure is such that the top surface and the box body are attached when the packaging box is sealed, as in the conventional packaging box described above, the workability at the time of sealing and opening is inferior and there is a problem in terms of cost. It was.

  For this reason, it is now possible to prevent the top of the packaging box from being unintentionally opened without sticking the top to the box body. There is a need for packaging boxes that can be made.

Therefore, the inventors of the present invention have intensively studied the means for solving the above-mentioned problems of the conventional invention, and as a result, the top surface of the packaging box composed of a single plate without using an adhesive member or a sticking means. The knowledge about the structure which makes it difficult to open is obtained. That is, in the packaging box of the present invention, a folding piece that is folded inward of the packaging box is extended on the upper edge of the side plate, and a lock hole is formed in this folding piece. On the other hand, in the present invention, the top surface of the packaging box is provided with a lock piece shaped to fit into a lock hole formed in the folded piece. As a result, when the top surface of the packaging box is closed, the lock piece fits into the lock hole, so that the top surface of the packaging box is difficult to open. The inventor has conceived that the problems of the prior art can be solved based on the above knowledge, and has completed the present invention.
More specifically, the present invention has the following configuration.

The packaging box of the present invention includes a side surface 10, a top surface 20, and a bottom surface 30. The side surface 10 is erected along the periphery of the bottom surface 30. The top surface 20 closes the upper opening defined by the side surface 10. The top surface 20 and the bottom surface 30 are disposed to face each other.
The side surface 10 includes side plates such as a front side plate 11, a rear side plate 12, a left side plate 13, and a right side plate 14. The front side plate 11 and the rear side plate 12 face each other, and the left side plate 13 and the right side plate 14 face each other. For this reason, a rectangular upper opening A is defined by the side plates 11 to 14. The top surface 20 has a top plate 21 that is connected to the rear side plate 12 and closes the upper opening A defined by the side plates.
In the present specification, the side plate connected to the top plate 21 is defined as the rear side plate 12, and the side plate facing the rear side plate 12 is defined as the front side plate 11.
The packaging box of the present invention further has at least one folding piece 16, 17, 18; lock holes 16a, 17a, 18a; and lock pieces 22, 23, 25.
The folding pieces 16, 17, and 18 are extended to the side that forms one or more upper openings A of the front side plate 11, the left side plate 13, and the right side plate 14, and are folded toward the inside of the packaging box 100. It is a piece.
The lock holes 16a, 17a, and 18a are holes formed in at least one of the folding pieces 16, 17, and 18 and formed from the side where the folding pieces 16, 17, and 18 are extended toward the tip side. .
The lock pieces 22, 23, and 25 are pieces that extend from the top plate 21 and fit into at least one of the lock holes 16 a, 17 a, and 18 a when the top opening 21 closes the upper opening A.

  According to the structure of the present invention, when the upper opening A is closed by the top plate 21, the lock pieces 22, 23, 25 provided on the top plate 21 are locked to the folding pieces 16, 17, 18. The holes 16a, 17a and 18a are fitted. Thereby, it becomes difficult to open the top plate 21. Therefore, it is possible to prevent a situation in which the top plate 21 opens at an unintended timing when the packaging box is transported without using an adhesive member or a sticking means.

In the packaging box of the present invention, the folded pieces are preferably a pair of left and right folded pieces 16 and 17 extending on the sides forming the upper openings A of the left side plate 13 and the right side plate 14.
Further, the lock holes are provided in the pair of left and right folding pieces 16 and 17, and are a pair of left and right lock holes 16a and 17a formed from the side where the pair of left and right folding pieces 16 and 17 are extended toward the distal end side. Preferably there is.
Further, the lock pieces are extended to the left and right side edges of the top plate 21, and when the top opening 21 closes the upper opening A, the pair of left and right lock pieces 22, 23 fitted in the pair of left and right lock holes 16 a, 17 a. It is preferable that

  As in the above configuration, the top plate 21 is more difficult to open by providing the folding piece, the lock hole, and the lock piece in two places on the left and right.

  In the present invention, the side surface 10 is extended to one side surface plate among the front side surface plate 11, the rear side surface plate 12, the left side surface plate 13, and the right side surface plate 14, and is joined to another adjacent side surface plate. It is preferable to further have. And in this invention, it is preferable that the joining piece 15 and said other adjacent side plate are joined by sewing together with the one or some thread | yarn 40. FIG.

In the present invention, as described above, the reliability of the package protection is improved by adopting a structure that makes it difficult to open the top surface of the packaging box. However, if such a top surface structure is adopted, there is a concern that it will be difficult to remove the package from the packaging box.
Therefore, in a preferred embodiment of the present invention, the joining piece 15 is extended to any one of the side faces forming the side face 10, and the side face board adjacent to the joining piece 15 is sewn (sewn together with a thread) and joined. . As a result, the side of the packaging box can be easily opened simply by removing the thread that stitches the joining piece and the side plate. Further, as described above, since the locking mechanism on the top surface is only the locking pieces 22, 23, 25 fitted in the locking holes 16a, 17a, 18a, the side surface of the packaging box can be opened. , The lock mechanism on the top will also be released naturally. Furthermore, if the bottom surface is formed by a method that does not require bonding, such as a semi-automatic method, the entire packaging box can be disassembled in an instant by simply removing the thread that stitches the joint piece and the side plate. This makes it very easy to take out the package.
As described above, the preferred embodiment of the present invention is provided with a locking mechanism on the top surface and a joining mechanism by stitching on the side surface, thereby ensuring the protection of the package during packaging and facilitating removal of the package during opening. Can be realized.

In the present invention, it is preferable that the lock holes 16a, 17a, and 18a have a shape having a portion that becomes wider from one side where the folding pieces 16, 17, and 18 are extended toward the tip side.
The lock pieces 22, 23, and 25 have a shape corresponding to the shape of the lock holes 16 a, 17 a, and 18 a and having a portion that becomes wider from the side extending from the top plate 21 toward the tip side. It is preferable.

  Like the above configuration, the folded pieces 16, 17, 18 and the lock holes 16a, 17a, 18a have a shape that has a portion that is wider than the root portion thereof, so that the folded pieces 16, 17, 18 and the lock holes are formed. When 16a, 17a, and 18a are fitted, the folding pieces 16, 17, and 18 are not easily removed from the lock holes 16a, 17a, and 18a. Thereby, the state in which the top plate 21 is closed is firmly maintained. Therefore, according to the preferable form of this invention, a package can be protected more reliably.

  As described above, in the packaging box of the present invention, when the upper opening is closed by the top plate, the lock piece provided on the top plate is fitted into the lock hole provided in the folding piece. As a result, it becomes difficult to open the top plate. For example, when the packaging box is transported, the top plate can be prevented from being opened at an unintended timing, and the package can be reliably protected.

  Moreover, in the preferable form of this invention, a joining piece is extended to any one side plate which forms a side surface, and the side plate adjacent to the joining piece is sewn and joined. As a result, the side of the packaging box can be easily opened simply by removing the thread that stitches the joining piece and the side plate. Moreover, since the lock mechanism on the top surface is only a lock piece fitted into the lock hole, the lock mechanism on the top surface is naturally released when the side surface of the packaging box is opened. In this way, the entire packaging box can be disassembled in an instant by simply removing the thread that stitches the joint piece and the side plate, so that the work of taking out the package becomes extremely easy.

FIG. 1 is a development view showing an example of a packaging box according to the first embodiment of the present invention. FIG. 2 is a perspective view showing an example of the opened packaging box. FIG. 3 is a perspective view showing the packaging box in a state where the folded pieces are folded back. FIG. 4 is an enlarged view for explaining the locking mechanism of the present invention. FIG. 5 is a perspective view showing an example of a packaging box in a closed state. FIG. 6 is an explanatory view showing an example of a side surface bonding structure applied to the present invention. FIG. 7 is a schematic diagram showing an example of a stitching mode. FIG. 8 is a perspective view schematically showing the packaging box and the package of the present invention. FIG. 9 is a development view showing an example of a packaging box according to the second embodiment of the present invention. FIG. 10 is a development view showing an example of a packaging box according to the third embodiment of the present invention.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below, but includes those appropriately modified by those skilled in the art from the following embodiments.
In this specification, “A to B” means “A to B”.

(1. First embodiment)
(1-1. Configuration of packaging box)
FIG. 1 is a development view of the packaging box 100 according to the first embodiment of the present invention, and shows a blank sheet 100 ′ forming the packaging box 100. As shown in FIG. 1, the blank sheet 100 is formed of a single sheet-like member in which the plate portions forming the side surface 10, the top surface 20, and the bottom surface 30 of the packaging box are connected. The blank sheet 100 'can be formed by punching and processing a sheet-like member such as a paper sheet such as cardboard or cardboard, or a plastic sheet, and providing a fold line and a cut line at a predetermined position. It is preferable that the blank sheet 100 ′ is particularly formed of cardboard. What is necessary is just to employ | adopt a well-known thing as the cardboard which forms blank sheet | seat 100 '. However, the thickness of the corrugated cardboard is preferably 1 mm or more, particularly 1 mm to 5 mm or 2 mm to 3 mm in order to strengthen the locking mechanism using the lock pieces 22 and 23 and the lock holes 16a and 17a described later. It is preferable to adopt what has.

  As shown in FIG. 1, the side surface 10 of the packaging box includes a pair of front side plates 11 and a rear side plate 12, and a pair of left side plates 13 and right side plates 14. Each side plate 11-14 is a rectangle. In the present embodiment, the side plates constituting the side surface 10 are connected in one direction in the order of the front side plate 11, the left side plate 13, the rear side plate 12, and the left side plate 14 in order from the left side in the drawing. A fold line (valley fold line) is formed on the boundary line connecting these side plates. Further, as shown in FIG. 1, a joining piece 15 is extended from the front side plate 11 located at one end of each side plate, with a fold line (valley fold line) as a boundary. For this reason, each side plate is bent along a fold line, and the joining piece 15 and the end of the right side plate 14 are joined to each other so that the front side plate 11 located at one end of each side plate and the other end The right side plate 14 located is connected via the joining piece 15. As a result, the side plates 11 to 14 are connected in the circumferential direction, the pair of front and back front side plates 11 and rear side plate 12 face each other, and the pair of left and right left side plates 13 and right side plate 14 face each other. 10 stands upright. A storage space is formed inside the packaging box by the side plates 11 to 14 being erected. A desired package can be stored in the storage space. In the present invention, the joining piece 15 and the right side plate 14 are preferably joined together by stitching with a thread. This point will be described later.

  As shown in FIG. 1, a top plate 21 is connected to the upper edge of the rear side plate 12. That is, the top surface plate 21 is connected to the rear side surface plate 12 via a fold line (valley fold line) in a direction orthogonal to the direction in which the side surface plates 11 to 14 are connected. The top plate 21 is formed in a rectangular shape, and has a shape and an area capable of closing the upper opening A (see FIG. 2) defined by the side plates 11 to 14 with one top plate 21. . That is, the length of the side that defines the periphery of the top plate 21 corresponds to the length of each of the side plates 11 to 14.

  A left lock piece 22 extends from a part of the left side edge of the top plate 21, and a right lock piece 23 extends from a part of the right side edge of the top plate 21. Note that the left side edge of the top plate 21 means a side in contact with the top edge of the left side plate 13 in a state where the packaging box is closed, among the four sides that define the top plate 21. Similarly, the right side edge of the top plate 21 means a side in contact with the top edge of the right side plate 14 when the packaging box is closed, among the four sides that define the top plate 21. The pair of left and right lock pieces 22 and 23 extend through the top plate 21 and a fold line (valley fold line), and can be bent freely. The pair of left and right lock pieces 22 and 23 are basically bent toward the inside of the packaging box when the packaging box is closed. As shown in FIG. 1, the pair of left and right lock pieces 22, 23 have a shape that gradually increases from the side connected to the top plate 21 toward the tip side. Preferably it is. More specifically, in the present embodiment, the pair of left and right lock pieces 22 and 23 gradually increase in width from the side connected to the top plate 21 toward the tip side, and then gradually decrease in width. It is made into a shape. The pair of left and right lock pieces 22 and 23 may be extended from part of the left and right sides of the top plate 21.

  An insertion piece 24 extends from the front side edge of the top plate 21. The front side edge of the top plate 21 means a side in contact with the upper edge of the front side plate 11 when the packaging box is closed, among the four sides that define the top plate 21. The insertion piece 24 is connected to the top plate 21 via a fold line (valley fold line), and is bent toward the inside of the packaging box when the packaging box is closed. The insertion piece 24 can be fixed by being inserted into the packaging box. In the present invention, the insertion piece 24 is an arbitrary element and is not necessarily required. Further, as will be described later, the insertion piece 24 can be replaced with a lock piece.

  On the other hand, as shown in FIG. 1, a left folding piece 16 and a right folding piece 17 extend from the left and right pair of left side plate 13 and right side plate 14 in the same direction as the top plate 21 described above. It is installed. That is, the pair of left and right left folding pieces 16 and right folding piece 17 extend from the upper edges of the pair of left and right left side plates 13 and right side plates 14, respectively. The left folding piece 16 and the right folding piece 17 are folded back toward the inside of the packaging box when the packaging box is closed. Therefore, a fold line (valley fold line) is formed on the boundary line between the pair of left and right folding pieces 16 and 17 and the pair of left and right side plates 13 and 14. Further, in order to facilitate the folding of the pair of left and right folding pieces 16 and 17, two parallel ruled lines can be formed along the boundary line. Further, the shape of the pair of left and right folding pieces 16 and 17 can be arbitrary. For example, in the example shown in FIG. 1, the top plate 21 of the pair of folding pieces 16, 17 is not overlapped with the pair of lock pieces 22, 23 formed on the top plate 21 in the state of the blank sheet 100 ′. Notches are provided in the corners of the side.

  Further, the left folding piece 16 is provided with a left lock hole 16a formed toward the front end side of the left folding piece 16 with a boundary line with the left side plate 13 as a starting point. Similarly, the right folding piece 17 is provided with a right lock hole 17a formed toward the front end side of the left folding piece 17 starting from the boundary line with the right side plate 14. The left lock hole 16a and the right lock hole 17a are provided with a left lock piece 22 and a right lock piece 23 provided on the left and right sides of the top plate 21 when the upper opening A of the packaging box is closed by the top plate 21, respectively. It is inserted. For this reason, it is preferable that the pair of left and right lock holes 16a and 17a have a shape corresponding to the pair of left and right lock pieces 22 and 23. As used herein, “corresponding shape” means that the pair of lock holes 16a, 17a is the same shape as the pair of lock pieces 22, 23, or is slightly larger than the pair of lock pieces 22, 23. It means a hole with a similar shape. However, even if the pair of lock holes 16a and 17a has a shape different from that of the pair of lock pieces 22 and 23, the shape may be any shape as long as the pair of lock pieces 22 and 23 are engaged. In the present embodiment, the pair of lock holes 16a and 17a are formed at the tips of the pair of folding pieces 16 and 17 from the boundary line where the pair of folding pieces 16 and 17 are extended, like the pair of lock pieces 22 and 23. The shape gradually becomes wider toward the side, and then gradually becomes narrower. Thus, in this embodiment, the pair of lock pieces 22 and 23 and the pair of lock holes 16a and 17a have the same or similar shape.

  As shown in FIG. 1, a front folding piece 18 extends from the front side plate 11 in the same direction as the top plate 21 described above. That is, the front folding piece 18 extends from the upper edge of the front side plate 11. The front folding piece 18 is folded back toward the inside of the packaging box when the packaging box is closed. For this reason, a fold line (valley fold line) is formed on the boundary line between the front folding piece 18 and the front side plate 11. Moreover, in order to make the front folding piece 18 easy to fold, two parallel ruled lines can be formed along the boundary line. In the present invention, the front folding piece 18 is an optional element and is not necessarily required. Further, as will be described later, the front side plate 18 may be provided with a lock hole.

  Further, when the left folding piece 16, the right folding piece 17, and the front folding piece 18 are folded back toward the inside of the packaging box, a structure is provided in which the folding pieces 16, 17, 18 are engaged with each other. Also good. Specifically, in the embodiment shown in FIG. 1, notches 18 b are formed in the left and right corners on the front end side of the front folding piece 18. Each of the pair of left and right folding pieces 16 and 17 has protrusions 16b and 17b that are inserted into a notch 18b provided in the front folding piece 18 when folded back toward the inside of the packaging box. Is formed. The protruding length of each protruding portion 16b, 17b may be substantially the same (T ± 5%) as the thickness T of the cardboard sheet forming the packaging box, for example. Thus, the protrusion 16b of the left folding piece 16 and the protrusion 17b of the right folding piece 17 are inserted into the respective notches 18b of the front folding piece 18, so that the inner direction of the packaging box is achieved. When turned back, the pair of left and right folding pieces 16, 17 and the front folding piece 18 come into engagement with each other.

  On the other hand, as shown in FIG. 1, in this embodiment, a bottom surface 30 is formed on each of the side plates 11 to 14 forming the side surface 10 in a direction opposite to the direction in which the top plate 21 is connected. The bottom plates 31 to 34 are connected to each other. In the present invention, the structure of the bottom surface 30 is not particularly limited, and a known structure can be appropriately employed. In the present embodiment, the bottom surface 30 employs a so-called semi-automatic lock bottom structure.

  More specifically, as shown in FIG. 1, the bottom surface 30 of the packaging box is divided into a front bottom plate 31 connected to the front side plate 11, a rear bottom plate 32 connected to the rear side plate 12, and the left side plate 13. The left bottom plate 33 is connected to the right bottom plate 34 and the right bottom plate 34 is connected to the right side plate 14. Fold lines (valley fold lines) are formed on the boundary lines between the bottom plates 31 to 34 constituting the bottom surface 30 and the side plates 11 to 14 constituting the side surface 10, respectively. It can be bent inward. As shown in FIG. 1, a convex portion 31 a is provided at the front end side center of the front bottom plate 31, and a concave portion 32 a is provided at the front end side center of the rear bottom plate 32. Each of the face plates 34 is formed with corners 33a, 34a. In the semi-automatic lock bottom structure, when the bottom surface 30 is formed, the rear bottom plate 32 is first bent, and the left bottom plate 33 and the right bottom plate 34 are stacked on the rear bottom plate 32. Then, the front bottom plate 31 is overlaid on the left bottom plate 33 and the right bottom plate 34, and further, the recess 32a of the rear bottom plate 32, the corner 33a of the left bottom plate 33, and the corner of the right bottom plate 34. The convex part 31a of the front bottom face board 31 is inserted in the clearance gap formed by 34a. Then, by making the convex portion 31 a of the front bottom surface plate 31 be positioned below the concave portion 32 a of the rear bottom surface plate 32, the bottom surface plates 31 to 34 are engaged with each other to form the bottom surface 30. It has become. Such a semi-automatic lock bottom structure can be used for the bottom surface structure of the present invention because the bottom surface 30 can be configured by mechanically engaging the bottom surface plates 31 to 34 without using an adhesive. It is preferable.

(1-2. Packaging structure)
Then, with reference to FIGS. 2-5, the structure for closing the packaging box 100 which concerns on this embodiment is demonstrated. FIG. 2 shows a state in which the front side plate 11 and the right side plate 14 are joined by the joining piece 15 to stand upright from the developed state shown in FIG. The state which comprised is shown. As shown in FIG. 2, a storage space having a substantially rectangular parallelepiped shape or a cubic shape is formed by raising the side surface 10 around the bottom surface 30. Further, an upper opening A is defined in the upper part of the packaging box 100 by the side plates 11 to 14 constituting the side surface 10. In the state shown in FIG. 2, a left folding piece 16 extends on the upper edge of the left side plate 13, and a right folding piece 17 extends on the upper edge of the right side plate 14. Although the front folding piece 18 is extended at the edge, the folding pieces 16 to 18 are not folded back. In addition, the aspect which joins the front side board 11 and the right side board 14 via the joining piece 15 is mentioned later.

  FIG. 3 shows a state in which the left folding piece 16, the right folding piece 17, and the front folding piece 18 are folded toward the inside of the packaging box 100 from the state shown in FIG. As shown in FIG. 3, each of the left folding piece 16, the right folding piece 17, and the front folding piece 18 is folded back to the inner surface of each of the left side plate 13, the right side plate 14, and the front side plate 11. Abut. Further, in the state shown in FIG. 3, a notch 18 b formed at both corners of the front folding piece 18 is formed with a protruding portion 16 b formed on the left folding piece 16 and a right folding piece 17. The protruding portion 17b is inserted and engaged (see FIGS. 1 and 2).

  4 shows a state in which the top plate 21 is bent from the state shown in FIG. 3 in a direction to close the upper opening A. In particular, the left lock piece 22 extended to the top plate 21 is a left folding piece. 16 is an enlarged view of the state before fitting in the left lock hole 16a formed in the No. 16. FIG. As shown in FIG. 4, the left lock piece 22 extended on the top plate 21 is bent inward according to the fold line. Further, since the left folding piece 16 is folded back, the left lock hole 16 a is formed at a position that forms the upper edge of the left side plate 13. When the left lock piece 22 is fitted into the left lock hole 16a, the left lock piece 22 is bent so as to be positioned inward of the packaging box with respect to the left folding piece 16, and the top plate 21 is used as it is at the upper opening A. Should be blocked. By doing so, after the upper opening A is closed by the top plate 21, the left lock piece 22 is naturally opened outward by the restoring force of the paper cardboard and is fitted into the left lock hole 16a. Although illustration is omitted, the right lock piece 23 can be fitted into the right lock hole 17a in the same procedure as described above.

  FIG. 5 shows a state in which the top plate 21 is bent and the upper opening A is closed from the state shown in FIG. As shown in FIG. 5, the insertion piece 24 extending at the tip portion of the top plate 21 is inserted into the packaging box 100. In addition, as described above, the left lock piece 22 and the right lock piece 23 that are extended on both the left and right sides of the top plate 21 are also housed in the packaging box 100. In this state, the left lock piece 22 is fitted into the left lock hole 16a, and the right lock piece 23 is fitted into the right lock hole 17a. As shown in FIG. 5, the upper opening A is closed without any gap by the top plate 21 in a state where the packaging box 100 of the present invention is closed. In addition, in a state where the top opening A is closed with the top plate 21, the pair of lock pieces 22 and 23 extending on the left and right sides of the top plate 21 are fitted in the pair of lock holes 16a and 17a. Even if the top plate 21 is opened, the top plate 21 is not opened unless the locked state between the pair of lock pieces 22 and 23 and the pair of lock holes 16a and 17a is released. As described above, according to the packaging box 100 of the present invention, the top plate 21 is difficult to open, and the package stored in the packaging box 100 is transferred from the upper opening A to the outside of the storage space during its transportation. You can prevent a situation that pops out.

(1-3. About the joining mode)
As described above, the packaging box 100 of the present invention employs a structure that makes it difficult to open the top plate 21. For this reason, although the certainty of package protection increases, it may become difficult to take out the package in the packaging box 100. Therefore, in the present invention, a device is devised for joining the end portions of the side plates forming the side surface 10 of the packaging box 100.

  FIG. 6 is a view for explaining a joining mode of the side surface 10. Fig.6 (a) is a perspective view which shows the external appearance of the location where the side surface 10 is joined, FIG.6 (b) has shown the cross-sectional shape of the packaging box. As shown in FIGS. 6A and 6B, in this embodiment, a joining piece 15 is extended on the front side plate 11 located at one end of each of the side plates 11 to 14 connected to each other. The joining piece 15 is overlapped with the right side plate 14 located at the other end of each of the side plates 11 to 14. The joining piece 15 and the right side plate 14 are sewn together by one or a plurality of threads 40. As shown in FIGS. 6A and 6B, it is preferable that the joining piece 15 and the right side plate 14 are sewn together by two or more sewing rows extending in the vertical direction. However, the stitching row may be one row or three or more rows.

  In the present invention, the type of thread 40 used for suturing is not particularly limited. For example, the yarn 40 may be formed of the same natural fiber as the raw material for the cardboard, or may be formed of chemical fiber such as rayon.

  FIG. 7 shows an example of how to sew. FIG. 7A shows single ring stitching, and FIG. 7B shows double ring stitching. As shown in FIG. 7 (a), single ring stitching is a seam made with only one upper thread, and the loops of the upper thread are connected to each other on the back side of the cardboard and connected in a chain form. How to continue sewing. In addition, as shown in Fig. 7 (b), double chain stitching means that the upper thread that can be sewn while reciprocating the front and back of the cardboard to be sewn and the sewing process that reciprocates in the folded part of this upper thread. This is a seam made of lower thread that is continuously stitched so that a lower thread loop is formed between upper thread loops on the back side of the cardboard. When the cardboard is stitched using the above single ring stitch and double ring stitch, if the upper thread or the lower thread is partly discontinuous, the discontinuous thread can be pulled in one direction. Suture can be easily released. For this reason, the operation | work which cancels | releases the stitching | suture state of the joining piece 15 and the right side surface board 14, and disassembles a packaging box becomes easy.

  Further, the packaging box 100 according to the present embodiment has a blank sheet 100 coupled with the locking mechanism of the top surface 20 and the lock bottom structure of the bottom surface described above because the side surface 10 is stitched with a thread. It is possible to assemble a packaging box without using an adhesive at one position. For this reason, if the stitching | joining which joins the joining piece 15 and the right side surface board 14 is cancelled | released, the packaging box 100 can be easily expand | deployed to the state of blank sheet 100 '. In particular, the locking mechanism of the top plate 21 of the packaging box 100 is such that a pair of lock pieces 22 and 23 extending on the top plate 21 are fitted into a pair of left and right lock holes 16a and 17a located on the left and right sides of the packaging box. Therefore, if the stitching that joins the joining piece 15 and the right side plate 14 is released, it will be developed into a blank sheet 100 'in an instant. Yes. Thus, the present invention produces an effect that a packaging box that can be easily disassembled can be provided by combining the characteristic locking mechanism formed on the top surface 20 and the joining mode of stitching the side surface 10 together.

(1-4. Relationship between packaging box and packaged item)
Then, with reference to FIG. 8, the preferable dimension of the packaging box which considered the relationship with a package is demonstrated. FIG. 8 is a perspective view schematically showing the packaging box 100 with the top plate opened and the packaged object O stored in the packaging box 100. In FIG. 8, the symbol Wp indicates the width of the storage space inside the packaging box 100, the symbol Dp indicates the depth of the storage space inside the packaging box 100, and the symbol Hp indicates the height of the storage space inside the packaging box 100. Yes. The storage space of the packaging box 100 means a space in which the package O can be stored, and is determined in consideration of the thickness of the cardboard and the thickness of the portion where the cardboard is folded. Moreover, in FIG. 8, the code | symbol Wo shows the width | variety of the package O, the code | symbol Do shows the depth of the package O, and the code | symbol Ho has shown the height of the package O. In FIG.

  As FIG. 8 shows, it is preferable that the packaging box 100 of this invention accommodates the rectangular parallelepiped or the cubic package O. And the various dimensions of the width Wp, the depth Dp, and the height Hp of the storage space of the packaging box 100 are designed to be approximately equal to the various dimensions of the width O, the depth Do, and the height Ho of the package O. It is preferable. For example, it is preferable that the dimensions of the width Wp and the depth Dp of the storage space of the packaging box 100 satisfy values of (Wo-20 mm) ≦ Wp ≦ Wo and (Do−20 mm) ≦ Dp ≦ Do. 8, the dimension of the height Hp of the storage space of the packaging box 100 is (Ho−α) ≦ Hp ≦, where α is the length of the lock piece extending from the top plate. It is preferable that the relationship of Ho is satisfied.

  As described above, by designing various dimensions of the storage space of the packaging box 100 in relation to the dimensions of the packaged object O, the locking mechanism of the top plate becomes stronger. That is, by storing the package O that is substantially equal to the size of the storage space of the packaging box 100, the pair of lock pieces extending on the left and right sides of the top plate are pushed into the side walls of the package O, It comes to hold | maintain in the state fitted to a pair of lock hole. As a result, in a state where the top plate 21 is closed, the pair of lock pieces are obstructed by the side walls of the package O and do not bend inwardly of the packaging box, so that it is difficult for the pair of lock pieces to come off from the pair of lock holes. ， It becomes difficult to open the top plate. As described above, the dimensions of the packaging box 100 according to the present invention are most preferably designed in a so-called made-to-order manner according to the dimensions of the package stored in the internal storage space.

(2. Second Embodiment)
Next, a packaging box according to the second embodiment of the present invention will be described with reference to FIG.
FIG. 9 is a developed view of the packaging box according to the second embodiment of the present invention, and shows a blank sheet 100 ′ forming the packaging box. Here, the packaging box according to the second embodiment will be described with a focus on differences from the first embodiment described above. In FIG. 9 showing the second embodiment, the same elements as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIG. 9, in the packaging box according to the second embodiment, the front locking piece 25 extends from a part of the front side edge of the top plate 21 instead of the insertion piece 24 shown in FIG. 1. ing. The front lock piece 25 extends through the top plate 21 and a fold line (valley fold line), and can be bent freely. The front lock piece 25 is basically bent toward the inside of the packaging box when the packaging box is closed. Further, as shown in FIG. 9, the front lock piece 25 preferably has a shape having a portion that gradually becomes wider from the side connected to the top plate 21 toward the tip side. . More specifically, in the present embodiment, the front lock piece 24 has a shape that gradually becomes wider from the side connected to the top plate 21 toward the tip side, and then gradually becomes narrower. Yes.

  On the other hand, as shown in FIG. 9, the front folding piece 18 is provided with a front locking hole 18 a formed toward the front end side of the left folding piece 18 starting from the boundary line with the front side plate 11. When the upper opening A of the packaging box is closed with the top plate 21, the front lock piece 25 provided on the front side edge of the top plate 21 is fitted into the front lock hole 18 a. For this reason, it is preferable that the front lock hole 18 a has a shape corresponding to the front lock piece 25. That is, it is preferable that the front lock piece 25 and the front lock hole 18a have the same or similar shape.

  As shown in FIG. 9, in addition to the pair of left and right lock pieces 22 and 23 and the pair of left and right lock holes 16a and 17a, a front lock piece 25 and a front lock hole 18a can be further provided. Thereby, when the top plate 21 is closed, the closed state is held by the three lock mechanisms when the upper opening A is closed, and therefore, the top plate 21 is more difficult to open. As a result, the certainty of protection of the stored items stored in the packaging box is further improved.

(3. Third embodiment)
FIG. 10 shows an exploded view of the packaging box according to the third embodiment of the present invention. As shown in FIG. 10, in the third embodiment, the pair of left and right lock pieces 22 and 23 and the pair of left and right lock holes 16a and 17a shown in FIG. Only the lock hole 18a is provided. Thus, in the present invention, it is also possible to form a lock mechanism only on the front side instead of the pair of left and right lock mechanisms.

As mentioned above, in this specification, in order to express the content of this invention, preferred embodiment of this invention was described, referring drawings. However, the present invention is not limited to the above-described embodiments, but includes modifications and improvements obvious to those skilled in the art based on the matters described in the present specification.
For example, in the present invention, the folding piece only needs to extend to at least one of the front side plate 11, the left side plate 13, or the right side plate 14, and extends only to the front side plate 11. Alternatively, it may be provided only on the left side plate 13 or may be provided only on the left side plate 14.
Moreover, the lock hole should just be formed in any one of each folding piece 16,17,18, and may be formed only in the front folding piece 16, or the left folding piece 17 may be sufficient as it. It may be formed only on the right side, or may be formed only on the right folding piece 18.
Further, the lock piece may be formed at a position corresponding to at least one of the plurality of lock holes even when the plurality of lock holes are formed.

  The present invention relates to a packaging box formed of, for example, paper cardboard. Therefore, the present invention can be suitably used in the packaging box manufacturing industry, the paper manufacturing industry, and the like.

DESCRIPTION OF SYMBOLS 10 ... Side surface 11 ... Front side plate 12 ... Rear side plate 13 ... Left side plate 14 ... Right side plate 15 ... Joining piece 16 ... Left folding piece 16a ... Left lock hole 16b ... Projection part 17 ... Right folding piece 17a ... Right lock hole 17b ... Protruding part 18 ... Front folding piece 18a ... Front locking hole 18b ... Notch 20 ... Top surface 21 ... Top plate 22 ... Left locking piece 23 ... Right locking piece 24 ... Insertion piece 25 ... Front locking piece 30 ... Bottom 31 ... Front Bottom plate 32 ... Rear bottom plate 33 ... Left bottom plate 34 ... Right bottom plate 40 ... Yarn 100 ... Packaging box 100 '... Blank sheet

Claims (4)

Including side, top and bottom,
The side surface includes front side plates, rear side plates, left side plates, and right side plates.
The top surface is a packaging box having a top plate connected to the rear side plate and closing an upper opening defined by each side plate,
A folded piece that extends to the side forming the upper opening of any one or more of the front side plate, the left side plate, and the right side plate, and is folded toward the inside of the packaging box;
A lock hole provided in at least one of the folded pieces and formed from the side where the folded piece is extended toward the tip side;
And a locking piece that extends from the top plate and fits into at least one of the lock holes when the top opening is closed by the top plate. The folded pieces are a pair of left and right folded pieces extending on the side forming the upper opening of the left side plate and the right side plate,
The lock holes are a pair of left and right lock holes provided in the pair of left and right folded pieces, and formed from the side where the pair of left and right folded pieces are extended toward the distal end side,
The lock pieces are a pair of left and right lock pieces that extend from both left and right edges of the top plate and fit into the pair of left and right lock holes when the top opening is closed by the top plate. The packaging box described. The side surface further includes a joining piece extending to one side surface plate of the front side surface plate, the rear side surface plate, the left side surface plate, and the right side surface plate, and joined to another adjacent side surface plate,
The packaging box according to claim 1 or 2, wherein the joining piece and the other adjacent side plate are joined together by sewing with one or a plurality of threads. The lock hole has a shape having a portion that becomes wider from one side where the folded piece extends to the tip side,
4. The shape according to claim 1, wherein the lock piece has a portion corresponding to a shape of the lock hole and a portion that is widened from a side extending from the top plate toward the tip side. 5. The packaging box described.

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