JP5147576B2 - Cardboard cases - Google Patents

Description

The present invention relates to a wireless corrugated cardboard case that is folded from a single corrugated cardboard into a substantially rectangular parallelepiped shape. Specifically, the lid can be closed in a short time, once the object is put in, the lid does not come off easily, and the lid top surface is flattened to reduce lid damage accidents. In addition, the present invention relates to a wireless cardboard case capable of quickly loading and unloading boxes.

When folding the corrugated cardboard, the wire of the fastener is often used to maintain the post-packing posture. On the other hand, several documents have already been disclosed regarding the wireless corrugated cardboard case that maintains the packaging posture without using wires.

As one of them, the present applicant has proposed a wireless corrugated cardboard case as described below. That is, from a piece of cardboard in which a cover part in which a plurality of cover surface pieces are continuously provided, a peripheral wall part in which a plurality of peripheral wall surfaces are provided in series, and a bottom part in which a plurality of bottom face pieces are provided in a continuous manner are vertically arranged A corrugated cardboard case that can be folded into a rectangular parallelepiped box, and the folding procedure is as follows. First, the peripheral wall surface is folded to form the peripheral wall portion into a box shape, and then the bottom piece is folded to form the bottom portion. Finally, bend the lid piece from the lid face piece with which the locking pieces are arranged continuously, and then fold the lid face pieces in order clockwise so that the corner of the lid face piece covers the corner of the lid face piece that was folded immediately before. The locking piece provided continuously to the lid surface piece is bent inward from the cut hole in the peripheral wall surface to lock the lid surface piece (Patent Document 1).

JP 2005-335712 A

However, the above-mentioned proposal of Patent Document 1 has the following problems. That is, this cardboard case is suitable for a container for storing relatively heavy fruits and vegetables such as radish and Chinese cabbage. Corrugated cardboard cases packed with fruits and vegetables are brought into the fruits and vegetables market and stored in piles. In order to wholesale these fruits and vegetables to the retail market, cardboard cases stacked in piles are pulled out in order from the top and loaded.

However, when closing the lid of the cardboard case, the lid surface pieces are sequentially bent clockwise, so it takes time to close the lid, and the top surface of the lid is not flat. In addition, the bottom of the cardboard case that is pulled out may be caught by the lid of the cardboard case placed under the cardboard case, and the lid may be broken and damaged.

The present invention has been made in view of the above problems, and the lid can be closed in a short time. Once the fruits and vegetables are put in, the lid is not easily removed, and the lid An object of the present invention is to provide a corrugated cardboard case that can reduce the accident of damage to the lid by flattening the top surface and can quickly load and unload boxes.

In order to achieve the above object, the corrugated cardboard case according to claim 1 is folded up with the first to fourth peripheral wall pieces and the peripheral wall portion continuously connecting the paste margin pieces as the peripheral walls when folded. And a lid portion having first to fourth lid surface pieces that are divided through a cut line and a bottom portion having first to fourth bottom piece pieces that are divided into a bottom portion and cut through the cut line when folded up. Is a cardboard case folded up from a substantially rectangular corrugated cardboard sheet,
A first locking piece that is connected to the second cover surface piece between the second and third cover surface pieces, and a first connection portion of the third cover surface piece and the third peripheral wall piece that are connected to the first cover piece. A first engagement hole into which the locking piece is inserted, a paste margin piece on the peripheral wall portion extending to the lid portion side, and extending between the extended paste margin piece and the first lid surface piece. The second engagement hole into which the second engagement piece is inserted into the connection portion of the second engagement piece, the first lid surface piece, and the first peripheral wall piece, which are provided continuously to the adhesive margin piece provided. And is provided.

A corrugated cardboard case according to a second aspect is the corrugated cardboard case according to the first aspect, in which a corner of the third lid surface piece facing the first locking piece is dropped, and the second locking piece is formed. The corners of the opposing first lid face pieces are angled down.

A corrugated cardboard case according to a third aspect is the corrugated cardboard case according to the first aspect, wherein the first engaging hole and the second lid surface piece are engaged with the first engaging hole. A first locking groove for locking the lid of the cardboard case is provided, and the second latching piece and an extended portion of the glue margin piece are engaged with the second engagement hole to cover the cardboard case. A second locking groove is provided to lock the.

A corrugated cardboard case according to a fourth aspect is the corrugated cardboard case according to the first to third aspects, wherein the first corrugated cardboard case is cut along the width of the first engaging hole and inserted into the first engaging hole. The first cover piece that covers the locking piece from the outside is provided on the third peripheral wall piece, and is cut along the width of the second engagement hole, and is inserted into the second engagement hole. A second covering piece for covering the locking piece from the outside is provided on the first peripheral wall piece.

According to the corrugated cardboard case of the first aspect, the first to fourth peripheral wall pieces and the peripheral wall portion connecting the adhesive margin pieces which are peripheral walls when folded up are in the middle, and the lid becomes a cut when folded. The lid portion having the first to fourth lid surface pieces divided through the bottom and the bottom portion having the first to fourth bottom surface pieces, which become the bottom when folded up and divided through the cut line, are vertically A corrugated cardboard case that is folded up from a substantially rectangular corrugated cardboard that is continuously provided; and a first locking piece that is provided between the second and third lid face pieces and that is continuous with the second lid face piece. The third cover surface piece and the third peripheral wall piece are provided with a first engagement hole into which the first locking piece is inserted, and the margin piece of the peripheral wall portion on the cover portion side. A second locking piece that is extended and connected to the glue margin piece that extends between the extended glue margin piece and the first lid piece, the first lid piece, and the first peripheral wall piece Since the second engagement hole into which the second locking piece is inserted is provided in the continuous part, the lid can be closed in a short time, and once the fruit and vegetables are put in, the lid is easy You can prevent it from coming off.

According to the corrugated cardboard case of the second aspect, the corner of the third lid surface piece facing the first locking piece is dropped, and the first lid surface piece facing the second locking piece. Since the corner of the corner is dropped, the first locking piece and the second locking piece can be provided at the corner where the corner is dropped.

According to the corrugated cardboard case of the third aspect, the lid of the corrugated cardboard case is locked by engaging the first engagement hole with the connecting portion of the first locking piece and the second lid surface piece. A second engagement member is provided with a first engagement groove, and engages with the second engagement hole at the continuous portion of the adhesive piece extending from the second engagement piece to engage the lid of the cardboard case. Since the stop groove is provided, it is possible to prevent the lid from being easily removed once the fruits and vegetables are put inside.

According to the corrugated cardboard case of the fourth aspect of the present invention, the first locking piece that is cut along the width of the first engaging hole and covers the first locking piece inserted into the first engaging hole from the outside. The cover piece is provided on the third peripheral wall piece, is cut along the width of the second engagement hole, and covers the second locking piece inserted into the second engagement hole from the outside. Since the cover piece is provided on the first peripheral wall piece, it is possible to prevent the lid from being easily removed once the fruits and vegetables are put inside.

As described above, according to the present invention, the lid can be closed in a short time, and once the fruits and vegetables are put in, the lid does not come off easily, and the top surface of the lid is flattened. As a result, the accident of damage to the lid can be reduced, and the boxes can be quickly loaded and unloaded.

Embodiments of the present invention will be specifically described below based on the embodiments of the present invention illustrated in the accompanying drawings.

First, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a development view of a corrugated paper in which the corrugated cardboard case of the present invention is developed. FIG. 2 is a perspective view of a state in which one opposing bottom piece is bent in the middle of closing the bottom of the cardboard case. FIG. 3 is a perspective view in a state where the bottom is also closed. FIG. 4 is a perspective view showing a state in which one opposing cover piece is bent in the middle of closing the lid of the cardboard case. FIG. 5 is a perspective view showing a state in which one and the other lid face pieces are folded in the middle of closing the lid. FIG. 6 is an enlarged perspective view of the engagement state between the locking piece and the locking groove, also in the middle of closing the lid. FIG. 7 is a perspective view showing a state where the lid is closed at the first locking position. FIG. 8 is a perspective view showing a state where the lid is closed at the second locking position.

As shown in FIG. 1, reference numeral 10 denotes a substantially rectangular corrugated cardboard, with a peripheral wall portion 20 in the middle, and a lid portion 30 provided continuously through a fold A in the left-right direction. A bottom portion 40 is continuously provided below the peripheral wall portion 20 via a crease B in the left-right direction.

The peripheral wall portion 20 includes first to fourth peripheral wall pieces 21, 22, 23, 24 and an adhesive margin piece 25, and the first peripheral wall piece 21 and the second peripheral wall piece 22 are arranged via a fold line C in the vertical direction. The second peripheral wall piece 22 and the third peripheral wall piece 23 are connected in series via a vertical fold line D, and the third peripheral wall piece 23 and the fourth peripheral wall piece 24 have a vertical fold line E. Are connected through. Further, the adhesive margin piece 25 and the first peripheral wall piece 21 are connected to each other via a fold F in the vertical direction. The first peripheral wall piece 21 and the third peripheral wall piece 23 are provided with finger holes 26.

The lid portion 30 is composed of a first lid surface piece 31, a second lid surface piece 32, a third lid surface piece 33, and a fourth lid surface piece 34, each divided through a cut line, and further glue The margin piece 35 is continuously provided so as to extend to the glue margin piece 25 of the peripheral wall portion 20.

Between the 2nd cover surface piece 32 and the 3rd cover surface piece 33, the 1st latching piece 51 is provided in a row by the 2nd cover surface piece 32 side, the paste margin piece 35 and the 1st cover A second locking piece 52 is provided between the face pieces 31 on the side of the adhesive margin piece 35.

The first locking piece 51 includes a first main locking piece 51a and a first sub-locking piece 51b, and the first main locking piece 51a is connected to the second lid surface piece 32 via a fold line G1. The first sub locking piece 51b is connected to the first main locking piece 51a via the fold line H1. One end of the fold line G1 is provided with a first main locking groove 51c, and one end of the fold line H1 is provided with a first sub-locking groove 51d.

Similarly, the second locking piece 52 includes a second main locking piece 52a and a second sub-locking piece 52b, and the second main locking piece 52a is connected to the adhesive margin piece 35 through the fold line G2. The second sub locking piece 52b is connected to the second main locking piece 52a via the fold line H2. One end of the fold line G2 is provided with a second main locking groove 52c, and one end of the fold line H2 is provided with a second sub locking groove 52d.

On the other hand, the corner 33a of the third cover surface piece 33 facing the first locking piece 51 is dropped. Similarly, the corner 31a of the first lid surface piece 31 facing the second locking piece 52 is also dropped.

A first engagement hole 61 is provided in the connecting portion of the third lid surface piece 33 and the third peripheral wall piece 23 that have been dropped, and the first main locking piece 51a and the second lid are provided. The second cover surface piece 32 that becomes the cover 3 of the cardboard case is locked by engaging with the first main locking groove 51c provided at one end of the fold line G1 of the continuous portion of the surface piece 32.

Similarly, a second engagement hole 62 is also provided in the connecting portion of the first lid surface piece 31 and the first peripheral wall piece 21 that have been dropped, and extends from the second main locking piece 52a. The fourth cover surface piece 34 which becomes the cover 3 of the corrugated cardboard case is locked by engaging with the second main locking groove 52c provided at one end of the fold line G2 of the continuous portion of the glue margin 35.

The third peripheral wall piece 23 is provided with a first cover piece 71 cut along the width of the first engagement hole 61, and the first engagement piece 61 inserted into the first engagement hole 61. The stop piece 51 is covered from the outside. Similarly, the first peripheral wall piece 21 is also provided with a second cover piece 72 cut along the width of the second engagement hole 62, and is inserted into the second engagement hole 62. The two locking pieces 52 are covered from the outside.

The bottom portion 40 includes a first bottom piece 41, a second bottom piece 42, a third bottom piece 43, and a fourth bottom piece 44, and is divided through a cut.

In the first bottom piece 41, a first upper bottom piece 41a and a first lower bottom piece 41b are connected to each other via a fold line J in the left-right direction. Similarly, the third bottom piece 43 is also a third upper piece 43b. The bottom piece 43a and the third lower bottom piece 43b are connected in series via a fold K in the left-right direction.

Further, the first lower bottom piece 41b is provided with grooves 41c and 41d on both sides immediately below the crease J, and the lower part is provided with locking pieces 41e and 41f on both sides by cutting the central portion into a trapezoidal shape. . Similarly, the third lower bottom piece 43b is also provided with grooves 43c and 43d on both sides immediately below the crease K, and the lower part is provided with locking pieces 43e and 43f on both sides by cutting the central portion into a trapezoidal shape. It is done.

The second bottom piece 42 includes two tongue pieces 45, 46 on the left and right sides, and the tongue pieces 45, 46 are located inside the corrugated cardboard case 1 along the continuous cuts X, Y, Z from the position of the fold line L. Bend towards you. The outline of the tongue 45 is substantially shaped like a right triangle composed of two straight sides sandwiching a right angle and a hypotenuse of a concave curve, and the crease L and the cut X are two straight sides sandwiching the right angle, and the cut Z is a hypotenuse. Is done. The outline of the tongue piece 46 is the same, but is placed at a position symmetrical to the tongue piece 45.

The fourth bottom piece 44 is also provided with two tongue pieces 47 and 48 on the left and right, and the tongue pieces 47 and 48 are similarly corrugated cardboard cases from the position of the fold line L along the continuous cut lines X, Y, and Z. 1 is bent inward and has the same contour and position as the tongues 45 and 46.

A locking hole 49 is formed at the tip of the trace where the tongue 45 is bent inward along the cut lines X, Y, Z. The tongue pieces 46, 47, 48 are similarly formed with locking holes 49. Further, the second bottom piece 42 is provided with a fitting recess 50u, and the fourth bottom piece 44 is provided with a fitting protrusion 50p.

The corrugated paper 10 has the above configuration, and the procedure for folding the corrugated paper 10 from the corrugated paper 10 into the corrugated cardboard case 1 will be described below.

First, it is folded up from the peripheral wall part 20. From the position of the folds C to F, the first peripheral wall piece 21, the second peripheral wall piece 22, the third peripheral wall piece 23, and the fourth peripheral wall piece 24 are bent so as to surround a square, and finally the adhesive margin piece 25 is attached. The folding of the peripheral wall portion 20 is completed by gluing the inside of the fourth peripheral wall piece 24. At the same time, the adhesive margin piece 35 continuously provided so as to extend to the adhesive margin piece 25 of the peripheral wall portion 20 is connected to the fourth peripheral wall piece 24 via the crease A. Glue the inside of the face piece 34.

Next, the bottom 40 is folded up. The second bottom surface piece 42 is bent inward by 90 degrees or more from the position of the crease B, and then the fourth bottom surface piece 44 is folded inward from the position of the crease B by 90 degrees or more while fitting the convex portion When 50p is returned so as to be fitted into the fitting recess 50u, as shown in FIG. 2, the center portion of the bottom 40 is inclined and recessed.

Subsequently, the first bottom piece 41 is bent inward from the position of the crease B, and the locking pieces 41e and 41f provided on both sides of the first lower bottom piece 41b are formed in a mountain shape from the position of the crease J. While being folded, the other tongue piece 48 of the fourth bottom piece 44 and the one tongue piece 45 of the second bottom piece 42 are fitted inward. At this time, the locking pieces 41e and 41f are fitted on the other tongue piece 48 and the first tongue piece 45 while sliding inward of the case, and finally the tips of the locking pieces 41e and 41f are locked into the locking holes. 49 hits and locks.

Similarly, the third bottom piece 43 is bent inward from the position of the crease B, and the locking pieces 43e and 43f provided on both sides of the third lower bottom piece 43b are formed in a mountain shape from the position of the crease K. The other tongue piece 46 of the second bottom piece 42 and the one tongue piece 47 of the fourth bottom piece 44 are fitted inward while being folded. At this time, the locking pieces 43e and 43f are fitted on the other tongue piece 46 and the one tongue piece 47 while sliding inward of the case, and finally the tips of the locking pieces 43e and 43f are inserted into the locking holes. 49 hits and locks. FIG. 3 shows a state where the first bottom face piece 41, the second bottom face piece 42, the third bottom face piece 43, and the fourth bottom face piece 44 are folded up and the bottom portion 40 is closed in this manner.

Finally, the lid 30 is folded up. First, as shown in FIG. 4, the third lid surface piece 33 is folded inward from the position of the fold A, and then the opposing first lid surface piece 31 is folded inward from the position of the fold A.

Subsequently, as shown in FIG. 5, the fourth lid surface piece 34 to which the second locking piece 52 is glued by the glue margin piece 35 is folded up from the position of the crease A into a mountain shape, and the second locking piece is The piece 52 is inserted into the second engagement hole 62 provided in the connecting portion of the first lid surface piece 31 and the first peripheral wall piece 21. That is, as shown in FIG. 6, the second main locking piece 52 a constituting the second locking piece 52 is folded up from the position of the fold line G <b> 2 into a mountain shape, and along the width of the second engagement hole 62. The second cover piece 72 cut in this way is inserted into the second engagement hole 62 while being pushed inward. Then, the second covering piece 72 pushed inward is returned to the original, and the second engaging hole 62 is covered from the outside.

Similarly, as shown in a part of FIG. 5, the second lid surface piece 32 provided with the first locking piece 51 is folded in a mountain shape from the position of the crease A, and the first locking piece is The piece 51 is inserted into the first engagement hole 61 provided in the connecting portion of the third lid surface piece 33 and the third peripheral wall piece 23. That is, the first main locking piece 51a constituting the first locking piece 51 is folded up from the position of the fold line G1 in a mountain shape, and is cut along the width of the first engagement hole 61. The cover piece 71 is inserted into the first engagement hole 61 while being pushed inward. Then, the first cover piece 71 pushed inward is returned to the original, and the first engagement hole 61 is covered from the outside.

In addition, there are two locking positions for closing the lid by folding the fourth lid surface piece 34 and the second lid surface piece 32, and the state where the lid is closed at the first locking position is shown in FIG. As described above, when the second locking piece 52 is inserted into the second engagement hole 62, the second main locking piece 52a and the second piece provided at one end of the fold line G2 connecting the adhesive margin piece 35 are provided. The main locking groove 52c and the second engagement hole 62 are engaged and locked.

Further, when the lid is closed at the second locking position, as shown in FIG. 8, when the second locking piece 52 is inserted into the second engaging hole 62, the second auxiliary locking piece This is a position where the second sub-engagement groove 52d provided at one end of the fold line H2 connecting the 52b and the second main locking piece 52a is engaged and locked.

The operation of the cardboard case 1 folded from the cardboard paper 10 as described above will be described. As described above, first, the adhesive margin piece 25 is glued inside the fourth peripheral wall piece 24 by folding from the peripheral wall portion 20. Subsequently, the second bottom piece 42 and the fourth bottom piece 44 constituting the bottom portion 40 are bent and engaged, and further, the first bottom piece 41 and the third bottom piece 43 are engaged from above.

To describe the operation in detail, the first bottom piece 41 is bent inward from the position of the crease B, and the locking pieces 41e and 41f provided on both sides of the first lower bottom piece 41b are formed on the crease J. The second tongue piece 48 of the fourth bottom face piece 44 and the one tongue piece 45 of the second bottom face piece 42 are fitted inwardly while being folded into a mountain shape from the position. At this time, the locking pieces 41e and 41f are fitted on the other tongue piece 48 and the first tongue piece 45 while sliding inward of the case, and finally the tips of the locking pieces 41e and 41f are locked into the locking holes. 49 hits and locks.

Similarly, the third bottom piece 43 is bent inward from the position of the crease B, and the locking pieces 43e and 43f provided on both sides of the third lower bottom piece 43b are formed in a mountain shape from the position of the crease K. The other tongue piece 46 of the second bottom piece 42 and the one tongue piece 47 of the fourth bottom piece 44 are fitted inward while being folded. At this time, the locking pieces 43e and 43f are fitted on the other tongue piece 46 and the one tongue piece 47 while sliding inward of the case, and finally the tips of the locking pieces 43e and 43f are inserted into the locking holes. 49 hits and locks. The fruits and vegetables are put in the cardboard case 1 formed by folding the peripheral wall portion 20 and the bottom portion 40 in this way, and the lid portion 30 is closed.

In closing the lid portion 30, first, the third lid surface piece 33 facing the first lid surface piece 31 is bent, and then the fourth lid surface piece 34 facing the second lid surface piece 32. Therefore, the lid 3 can be closed in a short time.

Further, the lid portion 30 has a first locking piece 51 connected to the second lid surface piece 32 inserted into the first engagement hole 61 and glued to the fourth lid surface piece 34. The two locking pieces 52 are inserted into the second engaging holes 62 to lock the lid 30. Since the lid portion 30 is latched at two locations of the first locking piece 51 and the first engagement hole 61 and the second locking piece 52 and the second engagement hole 62, the lid 3 is simple. Never go off.

The cardboard case 1 filled with fruits and vegetables is brought into the fruits and vegetables market and stored in a piled state. In order to wholesale the fruits and vegetables to the retail market, the fingers are put into the finger holes 36 of the cardboard cases 1 piled up and pulled out in order from the top, and then loaded and unloaded. In this case, the lid 3 of the corrugated cardboard case 1 has the fourth lid surface piece 34 opposed to the second lid surface piece 32 along the pulling direction, and the top surface of the lid is flattened. When the cardboard case 1 stacked on top is pulled out, there is no portion to be caught, and the accident of damage to the lid can be reduced, and the boxes can be quickly loaded and unloaded.

In addition, when packing fruits and vegetables in the cardboard case 1, when packing with a margin, the lid can be closed at the first locking position as shown in FIG. Moreover, when packing vegetables etc. larger than the capacity | capacitance of the cardboard case 1, as shown in FIG. 8, a lid | cover can be closed in a 2nd latching position.

In this way, by properly using the first and second locking positions, the lid can be expanded and locked out of the case even when a plurality of fruits and vegetables having different growth sizes are placed. Since there exists, a cover part can be latched in two steps according to the magnitude | size of fruit and vegetables.

As described above, according to the present invention, the lid can be closed in a short time, and once the fruit and vegetables are put in, the lid is not easily removed, and the top surface of the lid is flat. As a result, the damage to the lid can be reduced, and the boxes can be quickly loaded and unloaded.

When the first locking piece 51 or the second locking piece 52 is torn off during the loading and unloading operation and the lid cannot be closed, the lid surface pieces are sequentially bent clockwise as before. In this case, in order to make it easier to lock the lid surface piece folded first and the lid surface piece folded last, another embodiment will be described in which an adjuster lock portion is additionally formed in advance. .

FIG. 9 is a development view of corrugated paper in which a corrugated cardboard case with an additional adjuster lock portion is developed. FIG. 10 is a perspective view of a state in which the lid is closed using the adjuster lock portion.

A difference from the development of the corrugated cardboard shown in FIG. 1 is that the adjuster lock portion AJ is located at a position where the opposite side of the corner 31a of the first lid surface piece 31 is opposite to the second lid surface piece 32. This is the point of additional formation.

Accordingly, when the first locking piece 51 or the second locking piece 52 is torn off during the unloading operation and the lid cannot be closed, the second lid surface piece 32 starts to be folded, and the third lid surface The piece 33 and the fourth lid surface piece 34 are sequentially bent clockwise, and finally the first lid surface piece 31 is bent. Then, as shown in FIG. 10, if the first lid surface piece 31 folded last and the second lid surface piece 32 folded first are locked by the adjuster lock portion AJ, it becomes easier to lock than before. The problem that the first locking piece 51 or the second locking piece 52 is broken and the lid cannot be closed can be solved.

The expanded view of the corrugated paper which developed the corrugated cardboard case of this invention is shown. The perspective view of the state which bent the one bottom face piece which opposes in the middle stage which closes a bottom part same as the above is shown. The perspective view of the state which closed the bottom part same as the above is shown. The perspective view of the state which bent one opposing cover surface piece in the middle of closing a cover same as the above is shown. The perspective view of the state which bent the opposing one and other lid surface piece in the middle stage which closes a lid | cover is same as the above. The expansion perspective view of the engagement state of a locking piece and a locking groove is shown in the middle of closing the lid. The perspective view of the state which closed the lid | cover in the 1st latching position same as the above is shown. The perspective view of the state which closed the lid | cover in the 2nd latching position same as the above is shown. The development view of corrugated paper which developed the corrugated cardboard case which added the adjuster lock part is shown. The perspective view of the state which closed the lid | cover using the adjuster lock part same as the above is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Corrugated cardboard case 2 Perimeter wall 3 Lid 4 Bottom 10 Corrugated paper 20 Perimeter wall part 21 1st surrounding wall piece 22 2nd surrounding wall piece 23 3rd surrounding wall piece 24 4th surrounding wall piece 25 Glue margin piece 30 Cover part 31 1st Cover surface piece 32 Second cover surface piece 33 Third cover surface piece 34 Fourth cover surface piece 35 Extended paste margin piece 40 Bottom 41 First bottom surface piece 42 Second bottom surface piece 43 Third bottom surface Piece 44 fourth bottom piece 51 first locking piece 51c first locking groove 52 second locking piece 52c second locking groove 61 first engagement hole 62 second engagement hole 71 First covering piece 72 Second covering piece

Claims (4)

The first to fourth peripheral wall portions, which are the peripheral walls when folded up, and the peripheral wall portion connecting the paste margin pieces in the middle, become the lid when folded and are divided through the cut line. A substantially rectangular sheet of corrugated cardboard in which a lid portion having a lid surface piece and a bottom portion having first to fourth bottom face pieces that are divided into bottoms when cut up are connected vertically. A cardboard case that can be folded from
Between the second and third lid face pieces, a first locking piece that is continuous with the second lid face piece, and a continuous portion of the third lid face piece and the third peripheral wall piece. The first engagement hole into which the first locking piece is inserted is provided, the paste margin piece of the peripheral wall portion is extended to the lid portion side, and the extended paste margin piece and the first A second locking piece that is continuous with the extended glue piece between the lid surface pieces, and a second locking piece that is connected to the continuous portion of the first lid surface piece and the first peripheral wall piece. And a second engagement hole into which the cardboard is inserted. A corner of the third lid surface piece facing the first locking piece is dropped, and a corner of the first lid surface piece facing the second locking piece is dropped. The cardboard case according to claim 1. A first locking groove for locking the lid of the cardboard case by engaging with the first engagement hole is provided in a continuous portion of the first locking piece and the second lid surface piece, A second locking groove for locking the lid of the corrugated cardboard case by engaging with the second engagement hole is provided in a continuous portion of the second locking piece and the extended paste margin piece. The corrugated cardboard case according to claim 1. A first covering piece that is cut along the width of the first engaging hole and covers the first locking piece inserted into the first engaging hole from the outside is the third peripheral wall piece. A second covering piece that is cut along the width of the second engaging hole and covers the second locking piece inserted into the second engaging hole from the outside. 4. The cardboard case according to claim 1, wherein the cardboard case is provided on a peripheral wall piece.

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