JP2014046964A - Cardboard box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cardboard box that can effectively prevent horizontal shifting among cardboard boxes accumulated and hardly causes crumbling even when such cardboard boxes accumulated are stored, transferred, carried or the like.SOLUTION: The cardboard box 1 comprises: a box main body 10 having a bottom surface part 11 and a first pair of opposing lateral surfaces 12 and 12 and a second pair of opposing lateral surfaces 13 and 13; and a lid body 20 having a top surface 21 and a lateral surface 22. In the box main body 10, a salient portion 14 protruding toward the top surface is provided, and on the top surface 21, an overhung piece 23 pushed up by the salient portion 14 is formed. At a position corresponding to the overhung piece 23 in the bottom surface 11, an overhung piece insertion portion 15 is provided.

Description

  The present invention relates to a cardboard box.

For example, a cardboard box is frequently used as a box for packing and transporting and storing a plurality of articles such as various daily goods. The cardboard box is bent, cut into a corrugated cardboard board that has been cut into a predetermined shape, and if necessary, by using a bonding means such as an adhesive, a side part, a top part, and a bottom part Are preferably formed in a rectangular parallelepiped shape.
One of the features of cardboard boxes when used is that they are loaded on a pallet. In other words, when a plurality of cardboards are stacked on the pallet, the material is transported and moved, but there is a problem such as collapse of the loaded figure.
Therefore, in order to prevent the collapse of the load when loading pallets, a method of using a material for improving the frictional force on the corrugated cardboard surface or providing a fitting member for fixing at the time of stacking has been performed. .

Special table 2004-500290 gazette JP 2008-094403 A

For example, in Patent Document 1, an opening is provided on the top and bottom surfaces of a cardboard box, and a panel having a tab that protrudes through the opening on the top surface is provided inside the box. There has been proposed a cardboard box in which a stacked cardboard box is stabilized by inserting a tab protruding from the top surface of the cardboard box arranged below the bottom surface.
In patent document 2, the engagement protrusion is provided in the corner part of a tray so that a tray may mutually fit at the time of lamination | stacking.

However, the corrugated cardboard box of Patent Document 1 has a problem in that the fitting state with the opening is easily released unless the tab has sufficient strength.
In recent years, there has been a demand for a cardboard box that is less likely to collapse.

  The present invention is a corrugated cardboard box having a bottom body, a box body having a pair of opposing first side parts and a pair of opposing second side parts, and a lid having a top part and side parts, The box body is provided with a convex portion that protrudes toward the top surface portion side, a cantilever piece that is pushed up by the convex portion is formed on the top surface portion, and corresponds to the cantilever piece at the bottom surface portion. A cardboard box having a cantilever insertion portion at a position to be provided is provided.

  Further, the present invention is a method for stacking a plurality of cardboard boxes, wherein the box main body and the lid are combined, the cantilever piece is pushed up by the convex portion, and the lid body The present invention provides a method for stacking cardboard boxes, in which a cantilever piece protruding from the upper surface is fitted into a cantilever insertion portion of a corrugated cardboard stacked thereon.

Further, the present invention is a cardboard box forming blank comprising a box body forming blank and a lid forming blank,
The box body forming blank was continuously provided on both sides of the bottom surface forming plate, the first side surface plate and the second side surface plate continuously provided around the bottom surface portion, and the first side surface plate or the second side surface plate. The reinforcing portion forming plate includes a reinforcing portion forming portion that forms a reinforcing portion that obliquely connects the first side surface portion and the second side surface portion, and is connected to both sides thereof. And a side reinforcing portion fixed to the inner surface of the first side plate or the second side plate, and a convex portion is formed at an edge that becomes an upper end when the reinforcing portion forming portion is assembled.
The lid forming blank is a cardboard box forming blank in which a cantilever piece pushed up by the convex portion is formed at a position facing the convex portion of the reinforcing portion forming portion in the top surface portion. is there.

According to the corrugated cardboard box and the stacking method of the present invention, horizontal displacement between the corrugated cardboard boxes stacked by the engagement between the cantilever piece and the cantilevered piece insertion portion is effectively prevented. For this reason, cargo collapse is unlikely to occur even when stored, transported, or transported in a stacked state.
According to the blank for forming a corrugated cardboard box of the present invention, it is possible to easily form a corrugated cardboard box that is less likely to collapse when stacked, and to reduce the weight of the cardboard box.

FIG. 1 is a perspective view showing a state in which a box body and a lid body of a cardboard box according to an embodiment of the present invention are combined. FIG. 2 is an enlarged perspective view showing a portion A of FIG. FIG. 3 is a perspective view showing the box body in part B of FIG. FIG. 4 is a plan view of a box body forming blank for forming the box body of the cardboard box of FIG. FIG. 5 is a plan view of a lid forming blank for forming the lid of the cardboard box of FIG. 6 (a) is an enlarged plan view showing a cantilever insertion portion of the box body forming blank shown in FIG. 4, and FIG. 6 (b) is a reinforcing portion formation of the box body forming blank shown in FIG. FIG. 6C is an enlarged plan view showing a cantilever piece of the lid forming blank shown in FIG. 5 and its periphery. . FIG. 7 is a side view showing a state in which the box body of the cardboard box shown in FIG. 1 is viewed from the side on the second side face portion side. FIG. 8 is a cross-sectional view showing a state where the cantilever piece is pushed up by the convex portion. FIG. 9 is a cross-sectional view showing a state in which the push-up piece existing in the cantilevered piece insertion portion is pushed up by the cantilever piece pushed up by the convex portion. FIG. 10 is a view showing a cardboard box according to another embodiment of the present invention, in which (a) is an overhead view of the lid, and (b) is a partially cutaway perspective view of the box body. FIG. 11 is an enlarged plan view showing a cantilever insertion portion in another embodiment of the present invention.

Below, this invention is demonstrated based on the preferable embodiment.
A cardboard box 1 according to a preferred embodiment of the present invention shown in FIG. 1 carries a plurality of bag-like flexible packaging bodies such as pouches and gusset bags containing a liquid detergent for refilling as a container. Used as a box for storing and storing.

As shown in FIG. 1, the corrugated cardboard box 1 of the present embodiment includes a box body 10 having a bottom surface portion 11, a pair of first side surface portions 12, 12 facing each other, and a pair of second side surface portions 13, 13 facing each other. And a lid body 20 having a top surface portion 21 and a side surface portion 22.
Then, as shown in FIG. 2, the box body 10 is provided with a convex portion 14 protruding toward the top surface portion 21 side, and a cantilever piece 23 pushed up by the convex portion 14 is formed on the top surface portion 21 of the lid 20. Is formed. Further, as shown in FIG. 3, the bottom surface portion 11 has a cantilever insertion portion 15 at a position corresponding to the cantilever piece 23.

The box body 10 of the cardboard box 1 of the present embodiment is formed by using a single box body forming blank 30 as shown in FIG. The box body forming blank 30 can be easily obtained by, for example, punching and cutting a single cardboard board so as to have a predetermined shape in which the box body 10 is developed. In addition, the box body forming blank 30 is provided with the folding lines 3a to 3e and the cuts of the respective parts at appropriate locations by performing crease processing and cutting processing, etc. It can be easily assembled so as to have a desired three-dimensional shape to be described later.
Further, the lid 20 of the cardboard box 1 of the present embodiment is formed using a single lid forming blank 40 as shown in FIG. The lid forming blank 40 can be easily obtained by punching and cutting a single corrugated board so as to have a predetermined shape in which the lid 20 is developed. In addition, the lid body forming blank 40 is provided with fold lines 4a to 4c and cuts at appropriate portions by performing crease processing, cutting processing, and the like, so that the lid body 20 is It can be easily assembled so as to have a desired three-dimensional shape to be described later.

  The cardboard box 1 of the present embodiment is formed from a set of a cardboard box forming blank consisting of a box body forming blank 30 and a lid body forming blank 40, that is, a box body forming blank 30 and a lid body forming blank 40. Is done. The box body forming blank 30 and the lid forming blank 40 may be cut out from a single cardboard sheet or may be cut out from separate cardboard sheets.

The box body forming blank 30 will be described with reference to FIG.
The box body forming blank 30 has a rectangular bottom surface forming plate 31 that forms the bottom surface 11 at the center. The first side plates 32, 32 are connected to the left and right sides of the bottom surface forming plate 31 via a folding line 3a, and the second side surfaces of the bottom surface forming plate 31 are connected to the second side via a folding line 3b. Side plates 33, 33 are provided continuously.
In FIG. 4, reinforcing portion forming plates 34 are connected to both sides of the first side plate 32 positioned above and below the first side plate 32 via a folding line 3 c. The reinforcing portion forming plate 34 includes a reinforcing portion forming portion 35 and a pair of side reinforcing portions 36 and 37 that are connected to both sides of the reinforcing portion forming portion 35 via a folding line 3d.

  As shown in FIGS. 2 and 3, the reinforcing portion forming plate 34 forms the reinforcing portion 16 that obliquely connects the first side surface portion 12 and the second side surface portion 13 to the box body 10. Specifically, the reinforcing portion forming portion 35 which is a part of the reinforcing portion forming plate 34 constitutes the reinforcing portion 16. The reinforcing portions 16 are formed at the four corner portions of the box body 10 and improve the strength of the box body 10 and, consequently, the cardboard box 1 against compression in the height direction. In addition, the reinforcing portion 16 forms a cylindrical body having a triangular cross section together with the first side surface portion 12 and the second side surface portion 13 at each of the four corner portions of the box body 10. In other words, the strength of the cardboard box 1 against the load from multiple directions is improved.

  In the present embodiment, as shown in FIG. 2, the side surface reinforcing portion 36 of the reinforcing portion forming plate 34 is superimposed on the inner surface of the second side surface plate 33 that forms the second side surface portion 13, and an adhesive (see FIG. The side reinforcing portion 37 of the reinforcing portion forming plate 34 is overlapped with the inner surface of the first side plate 32 forming the first side surface portion 12, and an adhesive (not shown) is attached to the inner surface. Fixed through. For example, the side reinforcing portion 36 and the second side surface portion 13 are joined to each other through an adhesive in the range indicated by reference numeral 36a in FIG. 4, and the side surface reinforcing portion 37 and the first side surface portion 12 are 4 are joined to each other through an adhesive.

As shown in FIGS. 4 and 2, the convex portion 14 is formed at the end edge 34 u that becomes the upper end when the reinforcing portion forming plate 34 is assembled, more specifically, at the end edge 34 u in the reinforcing portion forming portion 35. Has been. Further, as shown in FIGS. 4 and 3, the convex portion 14 d of the edge 34 d positioned at the lower end when the reinforcing portion forming plate 34 is assembled, more specifically, the end edge 34 d of the reinforcing portion forming portion 35. A recess 17 is formed at a position corresponding to.
In addition, the cantilever insertion portion 15 is formed at a position on the bottom surface portion forming plate 31 that is located directly below the convex portion 14 and the concave portion 17 when the box body is assembled. The cantilever insertion part 15 is formed at a position corresponding to the cantilever piece 23, and is located directly below the cantilever piece 23 in each completed cardboard box 1. The cantilever insertion part 15 in this embodiment is a push-up insertion part formed by inserting an E-shaped slit 15a in the bottom surface part forming plate 31, as shown in FIG. 6A, and is surrounded by the slit 15a. As shown in FIG. 9, the pair of pushed-up pieces 15c, 15c are pushed up from below by a cantilever piece 23 of a corrugated cardboard box arranged adjacent to the bottom surface portion 11 and below, thereby An insertion portion into which the cantilever piece 23 can be inserted is formed on the bottom surface portion 11.

  Each of the second side plates 33, 33 provided continuously above and below the bottom surface forming plate 31 has a central portion 33 m with a short extension length from the folding line 3 b and a longer extension length than the central portion 33 m. Both end portions 33 s and 33 s are provided, and an inner surface plate 38 is connected to the central portion 33 m of the second side surface plate 33 via a folding line 3 e. The inner surface plate 38 is bent along the folding line 3e to the inner surface side of the central portion 33m, and is preferably fixed to the inner surface of the central portion 33m with an adhesive. Due to the presence of the inner surface plate 38, the assembled box body 10 has a high-strength dual structure portion at the center lower portion 13u of the second side surface portion 13 as shown in FIG. 39. Due to the presence of the window portion 39, even when the lid 20 is removed and the merchandise is displayed at the store with the merchandise in the box body 10, the merchandise inside can be easily seen from the side of the box body 10.

Note that a plurality of cardboard boxes 1 of the present embodiment can be stacked even when the lid 20 is removed.
The second side plate 33 is formed with a hand insertion portion 5 for inserting and holding a hand. The manual insertion portion 5 is formed by inserting a slit in the second side plate 33, and a hand can be inserted by pushing the press-in piece into the box body. A cutout 37b is formed in a side reinforcing portion 37 of the reinforcing portion forming plate 34, which will be described later, so as not to inhibit the pressing of the pressing piece.

Next, the lid forming blank 40 will be described with reference to FIG.
The lid forming blank 40 has a rectangular top surface portion forming plate 41 that forms the top surface portion 21 at the center. Then, third side plates 42 and 42 are connected to both the upper and lower sides of the top surface forming plate 41 via a folding line 4b, and the left and right sides of the top surface forming plate 41 are connected to each other via a folding line 4a. Narrow fourth side plates 43, 43 are provided continuously.
A narrow fifth side plate 44 is connected to both sides of the third side plate 42 via a folding line 4c.
And the cantilever piece 23 pushed up by the convex part 14 is formed in the top | upper surface part formation board 41, when the cover body 20 is attached to the upper part of the assembled box main body 10. As shown in FIG.
As shown in FIG. 6C, the cantilever piece 23 in the present embodiment is formed by inserting a slit 23 a in the top surface portion forming plate 41. The cantilever piece 23 has a pair of side edge portions 23c, 23c along the extending direction P, and a tip edge portion 23d having a longer length than each side edge portion 23c. The cantilever piece 23 has a linear connecting portion 23b with the top surface forming plate 41 between both ends of the slit 23a, and extends in a direction perpendicular to the connecting portion 23b. As shown in FIGS. 1 and 5, the cantilever piece 23 in the present embodiment is formed in the vicinity of the four corners of the top surface portion forming plate 41 and the top surface portion 21.

An example of the procedure for assembling the cardboard box 1 of the present embodiment will be described.
First, the box body forming blank 30 is assembled to obtain the box body 10.
To assemble the box body forming blank 30, the reinforcing part forming plate 34 is bent along the folding line 3 c and the pair of folding lines 3 d, and the side reinforcing part 37 is used on the inner surface of the first side plate 32. And fix. Further, the first side plate 32 is bent at a right angle along the folding line 3a. Next, the second side plate 33 is bent at a right angle along the folding line 3b, overlapped on the side reinforcing portion 36, and the state is fixed using an adhesive. Further, the inner surface plate 38 is bent along the folding line 3 e and fixed to the inner surface of the second side surface plate 33.
In this way, the box body 10 having a predetermined three-dimensional shape is assembled. In the assembled box body 10, as shown in FIG. 2, the reinforcing portion 16 including the reinforcing portion forming portion 35 is provided between the first side surface portion 12 and the second side surface portion 13. A cylindrical space is formed at an angle and is connected obliquely, and the convex portion 14 protrudes from an upper end edge 34 u of the reinforcing portion 16.

And after accommodating things, such as a bag-shaped flexible packaging body mentioned above, in the box main body 10 assembled in this way, the top surface forming plate 41 of the lid forming blank 40 is placed on the box main body 10. Then, the third side plates 42, 42 are bent along the folding line 4b. Next, the fourth side surface plate 43 and the fifth side surface plate 44 are bent along the folding lines 4a and 4c, respectively, and the first side surface plate 32 constituting the first side surface portion 12 or the fourth side surface plate 43 stacked thereon. Fix it with an adhesive. For example, the fourth side plate 43 and the fifth side plate 44 fix a portion indicated by reference numeral 45 in FIG. Thus, the cardboard box 1 including the lid body 20 having the top surface portion 21 made of the top surface portion forming plate 41 and the side surface portion 22 made of the third to fifth side plates 42 to 44 is completed.
During the assembly process of this corrugated cardboard box 1, preferably, after the lid forming blank 40 is positioned on the box body 10, the top surface portion is formed after the fourth side plate 43 and the fifth side plate 44 are fixed. By exerting a pressing force on the plate 41 toward the box body 10, the cantilever piece 23 is pushed up by the convex portion 14 and protrudes from the upper surface of the top surface portion 21 as shown in FIG. 2. In order to exert a pressing force on the top surface forming plate 41 toward the box body 10, the third side plates 42, 42 may be bent while pressing the top surface forming plate 41 against the box body 10, or the third side The fourth side plate 43 may be fixed to the first side surface portion 12 while pulling the face plate 42 or the fourth side plate 43 downward.

The cardboard box 1 of the present embodiment can be stored, transferred, or transported, for example, stacked on a pallet in two or more stages.
The cardboard box 1 of the present embodiment is formed at the position of the four cantilever pieces 23 pushed up by the convex portions 14 when the cardboard boxes are stacked, and the bottom surface portion of the cardboard boxes stacked thereon. Each cantilevered piece insertion portion 15 is formed so as to coincide with each other. Therefore, the cantilever piece 23 and the cantilever piece insertion portion 15 are engaged, and the stacked state between the cardboard boxes is stably maintained.

  In particular, the cantilever piece 23 in the corrugated cardboard box 1 of the present embodiment is pressed by the convex portion 14 and protrudes on the upper surface of the top surface portion 21 so as to be inclined with respect to the upper surface, and protrudes perpendicularly to the upper surface. Therefore, even when a force for horizontally shifting the stacked cardboard boxes is applied, the cantilever piece 23 exhibits an excellent resistance force and prevents the deviation. Thereby, even when the corrugated cardboard boxes 1 are stacked, stored, transferred or transported in two or three or more stages, cargo collapse is less likely to occur.

  Moreover, in the cardboard box 1 of the present embodiment, as shown in FIG. 8, the maximum height t <b> 1 at which the cantilever piece 23 projects from the upper surface of the top surface portion 21 is the thickness of the cardboard plate constituting the top surface portion 21. It is as follows. As a result, it is possible to further improve resistance to the horizontal shifting force, and to prevent sand, dust, insects and the like from entering the cardboard box. From the viewpoint of more surely achieving such an effect, the maximum height t1 of the cantilever piece 23 is the thickness of the corrugated board constituting the top surface portion 21, that is, the top surface portion forming plate 41 in the lid forming blank. The thickness is preferably t2 or less, more preferably 30% or more of the thickness t2, particularly 50% or more of the thickness t2, and preferably 200% or less of the thickness t2, more preferably the thickness t2. Or less, more preferably 80% or less of the thickness t2. The maximum height t1 of the cantilevered piece 23 is preferably 200% or less of the thickness t2, from the viewpoint of increasing the resistance to horizontal displacement, and the maximum height t1 is 100% or less to prevent the aforementioned mixing of sand and the like. From the viewpoint of

  In the cardboard box 1 of the present embodiment, the edge 34 u positioned at the upper end of the reinforcing portion forming plate 34 and the upper end edge of the first side plate 32 are positioned at substantially the same height, and they are on the inner surface of the top surface portion 21. The cantilever piece 23 is pushed up from the top surface of the top surface portion 21 by the protrusion height t14 at which the convex portion 14 protrudes from the end edge 34u of the reinforcing portion forming plate 34 while abutting. Therefore, the preferable protrusion height t14 from the edge 34u of the convex portion 14 is the same as the ratio of the maximum height t1 to the thickness t2 of the top surface forming plate 41 in the ratio of the top surface forming plate 41 to the thickness t2.

  In addition, the cantilevered piece 23 has a length in the extending direction P shown in FIG. 6C of preferably 10 mm or more, more preferably 15 mm or more, and preferably 50 mm or less, more preferably 40 mm or less. is there. Further, the cantilevered piece 23 has a length in the direction along the connecting portion 23b of preferably 10 mm or more, more preferably 20 mm or more, and preferably 60 mm or less, more preferably 50 mm or less. Further, the cantilevered piece 23 has a length in the extending direction P of 0.5 times or more, more preferably 2 times or more, and preferably 5 times or less of the length in the direction along the connecting portion 23b. More preferably, it is 3 times or less.

  Further, as shown in FIG. 6C, the cantilever piece 23 includes a pair of side edge portions 23 c and 23 c along the extending direction P, and a tip edge portion 23 d extending in a direction intersecting the extending direction P. However, having the shape connected by the arc-shaped corner portion secures a distance from the folding lines 4a and 4b around the top surface portion 21 and stabilizes the cantilever piece 23 in the standing state or standing state. From the viewpoint of improving the property. Alternatively, the pair of side edge portions 23c and 23c and the tip edge portion 23d may be connected to each other via an inclined edge portion inclined with respect to the side edge portion and the tip edge portion. From the viewpoint of

  Further, as shown in FIG. 6A, the push-up piece 15c of the cantilever insertion portion 15 also has a pair of side edges along the extending direction P1 and a tip edge extending in a direction intersecting the extending direction P1. As shown in FIG. 11, the pair of side edge portions and the tip edge portion are inclined with respect to the side edge portion and the tip edge portion. The shape connected via the inclined edge portion 15d ensures a distance from the folding lines 4a and 4b around the bottom surface portion 11 and improves the standing property of the push-up piece 15c or the stability of the standing state. It is preferable from a viewpoint of making it favorable. In addition, as shown in FIG. 6A, it is preferable that a plurality of push-up pieces 15c of the cantilever piece insertion portion 15 are formed in parallel with slits 15e. The extending directions P and P1 of the cantilever piece 23 and the push-up piece 15c are directed from the end portion side supported in a cantilevered state to the top surface portion 21 or other portions of the bottom surface portion 11 toward the unsupported end portion side. Direction.

As shown in FIG. 9, the maximum height t3 at which the push-up piece 15c is pushed up by the cantilever piece 23 pushed up by the convex portion 14 is also the thickness t4 of the corrugated board constituting the bottom surface portion 11, that is, for forming the main body. It is below thickness t4 of bottom face part formation board 31 in a blank. Thereby, it is possible to prevent sand, dust, insects and the like from entering the cardboard box from the bottom surface portion 11.
As described above, the cardboard box 1 of the present embodiment can display products in a state in which the window 39 is formed on the side surface by removing the lid 20. Therefore, when the lid 20 is attached, the fact that sand, dust or the like does not enter the inside means that there is no dust on the surface of the product or inside the box when opened and displayed as it is. This is extremely important when displaying products in such a manner.

In the corrugated cardboard box 1 of the present embodiment, the convex portion 14 is formed on the reinforcing portion forming plate 34 described above, particularly on the portion forming the reinforcing portion of the reinforcing portion forming plate. Therefore, the cardboard box 1 can be prevented from collapsing during loading while ensuring high strength, particularly high strength against the load in the height direction, and the thickness of the cardboard plate can be reduced to reduce the thickness of the cardboard box. It is also possible to reduce the overall weight.
In particular, in the cardboard box 1 of the present embodiment, since the reinforcing portion 16 is formed by the reinforcing portion forming plate 34 provided continuously with the first side plate, the overall weight of the cardboard box is ensured while ensuring excellent strength and displacement prevention. It is also possible to make it easier. In particular, since a triangular cylindrical portion is formed at the corner portion of the box body to increase the strength against compression and the effect of preventing displacement, both or one of the reinforcing portion 16 and the side reinforcing portion 36, or the entire reinforcing portion forming plate 34. 4 can be shortened with respect to the length in the height direction when the cardboard box is assembled, and the weight of those parts can be reduced to reduce the weight of the entire cardboard box. Can be planned. In addition to the reinforcing portion forming plate 34, the lengths in the vertical direction in FIG. 4 of both end portions 33s and 33s of the second side plate 33 and the total length in the same direction of the central portion 33 of the second side plate and the inner surface plate 38 are also shown. It can be shortened, thereby further reducing the weight.

  From the viewpoint of obtaining high strength at the corner portion of the box body 10 by the reinforcing portion 16, the width of the reinforcing portion 16, that is, the width of the reinforcing portion forming portion 35 equal to the width between the folding lines 3d and 3d in FIG. , Preferably it is 20 mm or more, More preferably, it is 30 mm or more, Preferably it is 80 mm or less, More preferably, it is 70 mm or less, for example, 30-70 mm is preferable, More preferably, it is 40-60 mm.

  Further, in the cardboard box 1 of the present embodiment, a recess 17 that allows the push-up piece 15c to be pushed up is formed at the lower end 34d of the reinforcing portion forming plate. The presence of the reinforcing portion 16 ensures high strength, particularly high strength against a load in the height direction, on the corrugated cardboard box 1, while the reinforcing portion 16 does not obstruct the pushing-up of the push-up piece 15 c, and the height of the recess 17 is high. Since the push-up piece 15c can be prevented from being pushed up beyond the height d17, the push-up piece 15c is unintentionally pushed up by an object other than the cantilever piece, leaving an opening in the bottom surface portion 11. It can also be prevented.

In the corrugated cardboard box of the present invention, from the viewpoint of more effectively preventing the deviation between the stacked cardboard boxes, the cantilever pushed up by the convex portion as in the corrugated cardboard box 1 of the present embodiment or the cardboard box shown in FIG. It is preferable that at least a pair of pieces 23 are formed at positions facing each other across the center portion 21c of the top surface portion.
In the cardboard box 1 of the present embodiment, as shown in FIG. 1, the cantilever pieces 23 are formed in pairs on the two diagonal lines L21 and L21 of the top surface portion 21, and have such a configuration. From the viewpoint of more effectively preventing displacement between stacked cardboard boxes.

The present invention is not limited to the above-described embodiment, and various modifications can be made.
For example, the lid 20 may have a side surface portion of the same height around the top surface portion 21 over the entire circumference. The lid 20 may be put on the box body 10 after being assembled in a three-dimensional shape as shown in FIG.
The shape of the cantilever piece 23 can be any shape such as a semi-circle, a triangle, or a quadrangle. Moreover, the cantilever insertion part 15 may be an opening formed in the bottom part. Further, in the above-described embodiment, the planar view shape of the insertion space of the cantilever piece generated after the push-up piece 15c is pushed up is similar to the shape of the cantilever piece 23. The shape of the opening and the plan view shape of the insertion space of the cantilever piece may be different from the shape of the cantilever piece as long as the cantilever piece 23 can be engaged.

  Moreover, the convex part 14 which pushes up the cantilever piece 23 may be provided in the edge 34u in parts other than the reinforcement part formation part in the reinforcement part formation board 34, and as shown in FIG. May be formed on the reinforcing portion forming plate 34 made of another corrugated board. Further, the convex portion 14 that pushes up the cantilever piece 23 is preferably formed in the reinforcing portion forming portion of the reinforcing portion forming plate 34, but as shown in FIG. 10, the reinforcing portion forming portion of the reinforcing portion forming plate 34. It may be formed in other parts.

DESCRIPTION OF SYMBOLS 1 Cardboard box 10 Box main body 11 Bottom surface part 12 1st side surface part 13 2nd side surface part 14 Convex part 15 Cantilever piece insertion part 16 Reinforcement part 17 Recessed part 20 Cover body 21 Top surface part 22 Side surface part 23 Cantilever piece 30 Box body formation Blank 31 Bottom surface forming plate 32 First side surface plate 33 Second side surface plate 34 Reinforcement portion forming plate 35 Reinforcement portion forming portion 36, 37 Side surface reinforcing portion 40 Blank for forming lid body 41 Top surface portion forming plate 42-44 3rd-5th side plate which forms a side part

Claims (9)

A cardboard box having a bottom body, a box body having a pair of first side parts facing each other and a pair of second side parts facing each other, and a lid having a top part and side parts,
The box body is provided with a convex portion that protrudes toward the top surface portion side, and a cantilever piece that is pushed up by the convex portion is formed on the top surface portion,
A corrugated cardboard box having a cantilevered piece insertion portion at a position corresponding to the cantilevered piece on the bottom surface.   The corrugated cardboard box according to claim 1, wherein the cantilever piece has a maximum height protruding from an upper surface of the top surface portion that is equal to or less than a thickness of a corrugated board constituting the top surface portion.   The box body has a reinforcing portion that obliquely connects the first side surface portion and the second side surface portion by forming a cylindrical space in the corner portion of the box main body, The cardboard box according to claim 1 or 2, wherein the convex portion is provided on the top surface side.   The first side surface portion and the second side surface portion have a first side surface plate and a second side surface plate continuously provided around the bottom surface portion, and the reinforcing portion is provided on both sides of the first side surface plate or the second side surface plate. The corrugated cardboard box according to claim 3, wherein a reinforcing part forming plate is formed continuously, and the convex part is formed at an upper end portion of the reinforcing part forming plate.   The cantilever insertion part is a push-up insertion part that creates an insertion space for the cantilever piece when the push-up piece is pushed up, and a recess that allows the push-up piece to be pushed up is formed at the lower end of the reinforcing part forming plate The cardboard box according to claim 4.   The cardboard box according to any one of claims 1 to 5, wherein at least a pair of the cantilever pieces are formed at positions facing each other across the central portion of the top surface portion.   The cardboard box according to claim 6, wherein the cantilever pieces are formed in pairs on two diagonal lines of the top surface portion. A cardboard stacking method for stacking a plurality of cardboard boxes according to any one of claims 1 to 7,
Combining the box body and the lid, the cantilever piece is pushed up by the convex portion, and the cantilever piece protruding from the upper surface of the lid body is used as a cantilever insertion portion for corrugated cardboard stacked thereon. A method for stacking cardboard boxes to be fitted. A cardboard box forming blank consisting of a box body forming blank and a lid forming blank,
The box body forming blank was continuously provided on both sides of the bottom surface forming plate, the first side surface plate and the second side surface plate continuously provided around the bottom surface portion, and the first side surface plate or the second side surface plate. The reinforcing portion forming plate includes a reinforcing portion forming portion that forms a reinforcing portion that obliquely connects the first side surface portion and the second side surface portion, and is connected to both sides thereof. And a side reinforcing portion fixed to the inner surface of the first side plate or the second side plate, and a convex portion is formed at an edge that becomes an upper end when the reinforcing portion forming portion is assembled.
The lid forming blank is a cardboard box forming blank in which a cantilever piece pushed up by the convex portion is formed at a position facing the convex portion of the reinforcing portion forming portion on the top surface portion.

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