JP7342767B2 - packaging box - Google Patents

Description

The present invention relates to a packaging box in which a bottom cover that closes one opening of the body can be formed in a so-called one-touch operation when the body is changed from a flat state to a cylindrical state.

For example, in a packaging box such as a cardboard box, a bottom flap is connected to the lower edge of the four wall parts that make up the cylindrical body that is the side surface, and the bottom flap can be closed by bending the bottom flap against the wall part. is formed. For example, after bending a pair of opposing bottom flaps inward at 90 degrees, fold another pair of opposing bottom flaps inward at 90 degrees and overlapping them so that their leading edges abut each other, and the abutting portion For example, the bottom lid is kept closed by pasting tape on it.

On the other hand, so-called one-touch bottom packaging boxes that do not require the above-mentioned work of overlapping the bottom flaps have been known (for example, see Patent Document 1). A packaging box with a one-touch bottom has four bottom flaps that are connected to the lower edge of the wall, and each pair of opposing bottom flaps has a fixed adhesive that is attached to the adjacent bottom flap on one side by gluing or the like. The pieces are connected through the fold. In packaging boxes with one-touch bottoms, the body is in a flat state when not in use, and at this time the bottom flap is folded into the inside of the body, and when the body is in a cylindrical state when in use, the bottom flap is folded. The bottom cover is formed by automatically standing up.

Japanese Patent Application Publication No. 2000-079943

When a packaging box with a one-touch bottom is used with the bottom lid facing down, the weight of the contents is applied to the bottom flap, so the bottom flap is folded into the body, making the body flat. There is no risk of the packaging box being deformed. On the other hand, when the bottom lid is used horizontally (for example, for transportation or storage), if a load that compresses the bottom lid from above (hereinafter referred to as "compression load") is applied to the packaging box, the bottom There is a risk that the packaging box may be deformed such that the flap is folded into the interior of the body and the body becomes flat. As described above, the conventional packaging box employing a one-touch bottom has not been studied for its strength against compressive loads when used with the bottom lid lying on its side, and this is a problem.

The present invention has been made in view of the above-mentioned problems, and it is possible to prevent the bottom lid from being damaged even if a compressive load is applied when the bottom lid is used horizontally in a packaging box having a so-called one-touch bottom. It is an object of the present invention to provide a packaging box that can be prevented from being folded inside the body.

The present invention includes four wall portions constituting a body portion, and first to fourth flaps constituting a bottom cover that closes one opening of the body portion and connected to the wall portions. , the first to fourth flaps are folded into the interior of the body when the body is in a flat state, and the opposing first and third flaps each have a second flap adjacent to one side thereof. and a fixing piece attached to the outer surface of the fourth flap, and the first to fourth flaps are configured to stand up against the wall portion when the body portion is in a cylindrical state. The present invention relates to a packaging box that is bent to form the bottom lid. In the packaging box of the present invention, the second flap is provided with a protruding part on a part of its tip edge, and the protruding part is engaged with the boundary between the fourth flap and the wall part to which the fourth flap is connected. The second flap is overlapped inside the fourth flap, and the protruding part is inserted into the engaging part.

In the packaging box of the present invention, preferably, the second flap has a support piece connected to its tip edge, and the support piece overlaps the inside of a wall portion to which the fourth flap is connected. It can be configured as a feature.

Further, in the packaging box of the present invention, preferably, a position of the second flap that stands up with respect to a wall surface portion to which the second flap is connected is a wall surface portion of the fourth flap to which the fourth flap is connected to the wall surface portion. It can be configured such that it is located inside the position where it stands up with respect to the part.

Further, in the packaging box of the present invention, preferably, the second flap has a crease formed at a position a predetermined length apart from the tip edge of the protrusion, and the protrusion is arranged with respect to the second flap. It can be configured so that it can be folded.

Further, preferably in the packaging box of the present invention, the tip edge of the fourth flap is recessed at least in the center.

Further, in the packaging box of the present invention, preferably, the length of the second flap is shorter than the width of the wall portion to which the first flap is connected and the wall portion to which the third flap is connected. It can be configured to have the following characteristics.

According to the packaging box of the present invention, it is possible to form the bottom lid in a so-called one-touch operation, and even if a compressive load is applied when the bottom lid is used horizontally, the first - It is possible to prevent the fourth flap from being folded into the interior of the body and deforming the body into a flat state.

FIG. 1 is an overall perspective view of a packaging box according to an embodiment of the present invention, viewed from the top lid side. FIG. 2 is a perspective view of a portion of the bottom lid side of the packaging box according to an embodiment of the present invention. FIG. 2 is a diagram of a packaging box according to an embodiment of the present invention, viewed from the inside on the bottom lid side. FIG. 2 is a plan view of a blank sheet for assembling the packaging box shown in FIG. 1; FIG. 5 is an enlarged plan view of a part of FIG. 4; It is a perspective view which expands and shows a part of a 2nd flap and the wall surface part in which the joint piece was provided. It is a front view which expands and shows a part of a 2nd flap and the wall surface part where the front edge of the 2nd flap faces. (A) is a sectional view taken along line AA in FIG. 3, and (B) is a sectional view taken along line BB in FIG. It is a sectional perspective view which expands and shows a part of the 2nd flap, the 4th flap, and the wall surface part in which the joint piece was provided. It is a sectional perspective view which expands and shows a part of a 2nd flap and a 4th flap. It is a partially enlarged perspective view showing the procedure for folding the packaging box. It is a partially enlarged perspective view of a folded packaging box.

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows the overall appearance of a packaging box 1 that is an embodiment of the present invention, FIG. 2 shows the appearance of the bottom lid 3 side of the packaging box 1, and FIG. 3 shows the bottom lid 3 side of the packaging box 1. shows the internal structure of In FIGS. 1 to 3, the packaging box 1 is shown with the bottom cover 3 and top cover 4 lying on their sides.

The packaging box 1 includes a cylindrical body 2 serving as a side surface, a bottom cover 3 serving as an end face that closes one opening of the body 2, and a top cover 4 serving as an end face closing the other opening of the body 2. Be prepared. The upper lid 4 can be opened and closed, and by opening the upper lid 4, contents can be stored inside the body 2. The bottom cover 3 is located on the opposite side of the top cover 4 and cannot be opened or closed. The bottom cover 3 is a so-called one-touch bottom, and when the packaging box 1 is not in use, it can be folded into the body 2 to make the body 2 flat, and when the packaging box 1 is in use, the body 2 can be folded into a cylindrical shape. It is formed almost automatically when the state is set.

The body portion 2 is composed of four wall portions 20 to 23. The bottom cover 3 is composed of four flaps (first to fourth flaps) 30 to 33 connected to one edge of the wall portions 20 to 23. The upper lid 4 is composed of four flaps (fifth to eighth flaps) 40 to 43 connected to the other edge of the wall portions 20 to 23.

The packaging box 1 can be assembled using blank sheets 10 shown in FIG. 4, for example. Note that the shape of the blank sheet 10 is not limited to the shape shown in FIG. 4. The blank sheet 10 can be formed using various known paper materials such as cardboard and corrugated paper. The blank sheet 10 includes wall portions 20 to 23, first to fourth flaps 30 to 33, fifth to eighth flaps 40 to 43, a joint piece 24, a movable piece 25, a locking piece 26, 2 It includes two fixing pieces 34 and 35, a bending piece 36, a support piece 38, and an insertion piece 44.

First, the body section 2 will be explained. The wall portions 20 to 23 constituting the body portion 2 are arranged in a row in a straight line in the blank sheet 10, as shown in FIG. The wall portions 20 to 23 have a rectangular shape in plan view, and in this embodiment, have a rectangular shape. The widths of the pair of wall sections 21 and 23 are longer than the widths of the other pair of wall sections 20 and 22, but may be equal. Note that in the present disclosure, the width refers to the length in the left-right direction in FIG. 4 .

Folds L1 to L3 are provided at the boundaries between adjacent wall portions 20 to 23. Fold lines L1 to L3 and fold lines L4 to L20, which will be described later, can be constituted by ruled lines (folded lines) formed by compressing the thickness of the blank sheet 10 from one side of the blank sheet 10, for example. A joint piece 24 is connected to the wall portion 20 located at one end (the left end in FIG. 4) via a fold line L4.

When the packaging box 1 is assembled, the wall sections 20 to 23 form a rectangular tube shape as shown in FIGS. 1 to 3, and the space inside thereof becomes a space for accommodating the contents. When the wall portions 20 to 23 are made into a rectangular tube shape, the wall portion 20 is bonded to the inner surface of the wall portion 23 with an adhesive such as glue, and the joint pieces 24 connected to the wall portion 20 are bonded to the inner surface of the wall portion 23. and the wall portion 23 are connected.

The joint piece 24 is formed into a trapezoidal shape as shown in FIG. 4, and at least the side on the first flap 30 side is larger in the direction in which the length of the tip edge of the joint piece 24 is shorter than the length of the fold line L4. It is sloping. Thereby, the joint piece 24 is formed so as not to overlap the bent portion 36 of the second flap 31, which will be described later, as shown in FIG. 6 when the packaging box 1 is assembled.

As shown in FIG. 4, first to eighth flaps 30 to 33 and 40 to 43 are connected to the wall portions 20 to 23 with the wall portions 20 to 23 interposed therebetween, as shown in FIG. A first flap 30 and a fifth flap 40 are connected to the wall section 20 via fold lines L5 and L9, and a second flap 31 and a sixth flap 41 are connected to the wall section 21 via fold lines L6 and L10. A third flap 32 and a seventh flap 42 are connected to the wall section 22 via fold lines L7 and L11, and a fourth flap 33 and an eighth flap 43 are attached to the wall section 23 via fold lines L8 and L12. They are installed consecutively.

A pair of notches 50 are formed in the wall portion 23 and extend equally from the boundary with the eighth flap 43 in a direction orthogonal to the boundary. As a result, the movable piece 25 is integrally provided on the wall portion 23 between the pair of notches 50. The movable piece 25 is located at the center of the wall portion 23 in the width direction. A fold line L13 is provided between the ends of the pair of notches 50, and the movable piece 25 can be bent relative to the wall portion 23. A locking piece 26 is connected to the distal end edge of the movable piece 25 .

A concave notch 51 is formed in the eighth flap 43 so as to be continuous with the pair of notches 50 from the boundary with the corresponding wall portion 23, so that the locking piece 26 is connected to the movable piece 25. ing. In the present disclosure, a wall portion corresponding to a flap refers to a wall portion to which the flap is connected. A fold line L14 parallel to the fold line L13 is provided at the boundary between the movable piece 25 and the locking piece 26, and the locking piece 26 can be bent relative to the movable piece 25. A finger hole 27 is formed in the locking piece 26 at the boundary with the movable piece 25 and is large enough to allow at least one user's finger to be inserted therein. By inserting a user's finger into the pointing hole 27, the movable piece 25 can be easily bent against the wall portion 23.

Next, the bottom cover 3 will be explained. When the packaging box 1 is assembled, the fourth flap 33 is stacked on the outside of the second flap 31, and the first to fourth flaps 30 to 33 constituting the bottom lid 3 are stacked on the outside of the second flap 31. A first flap 30 and a third flap 32 are stacked on top of each other.

The first flap 30 and the third flap 32 are formed into a substantially triangular shape, as shown in FIGS. 4 and 5. A fixing piece 34 is connected to the oblique side of the first flap 30 on the second flap 31 side, and a fixing piece 35 is connected to the oblique side of the third flap 32 on the fourth flap 33 side. A fold line L15 is provided at the boundary between the first flap 30 and the fixed piece 34, a fold line L16 is provided at the boundary between the third flap 32 and the fixed piece 35, and the fixed piece 34 is provided with respect to the first flap 30. The fixing piece 35 can be bent relative to the third flap 32. When the packaging box 1 is assembled, the fixing pieces 34 and 35 are attached to the outer surface of the second flap 31 with adhesive, for example, and the fixing pieces 35 are attached to the fourth flap 33 as shown in FIG. It is bonded to the outer surface of the board with, for example, an adhesive.

As shown in FIGS. 4 and 5, the first flap 30 and the third flap 32 are provided with horizontal portions 30a and 32a that are parallel to the fold lines L5 and L7, respectively. The fixing pieces 34 and 35 can be attached to the second flap 31 and the fourth flap 32 by hand or by mechanical attachment using a box-making machine, The presence of the parts 30a and 32a allows machine pasting. The length of the horizontal portions 30a, 32a is preferably 15 mm or more, for example.

As shown in FIGS. 4 and 5, the second flap 31 has a substantially rectangular shape, in this embodiment, a substantially rectangular shape. The length d2 of the second flap 31 in the direction orthogonal to its width (the length from the tip edge of the second flap 31 to the boundary with the corresponding wall surface section 21) is the width of the narrow wall surface sections 20 and 22. It may be equal to d3, but is preferably somewhat shorter. Thereby, when the packaging box 1 is assembled, the bottom lid 3 sufficiently closes one opening of the body section 2 with the second flap 31, as shown in FIG. Further, when the packaging box 1 is assembled, a gap S is formed between the leading edge of the second flap 31 and the inner surface of the opposing wall portion 23, as shown in FIGS. 3 and 7.

As shown in FIGS. 4 and 5, the second flap 31 includes a triangular bent portion 36 at the end on the first flap 30 side. The second flap 31 is provided with an oblique line extending from the corner (the upper left corner in FIGS. 4 and 5) toward the tip edge of the second flap 31 on the boundary side with the corresponding wall surface part 21 and on the first flap 30 side. An extending fold line L17 is provided, and the bent portion 36 can be bent with respect to other parts of the second flap 31 by the fold line L17.

In the blank sheet 10, as shown in FIGS. 4 and 5, the second flap 31 is located at a boundary (fold line L6) with the corresponding wall surface portion 21 at a position similar to that of the other first, third, and fourth flaps 30, 3. , 33 and the corresponding wall sections 20, 22, 23 (fold lines L5, L7, L8) are slightly shifted toward the wall sections 20 to 23. The length d1 of this positional shift is not particularly limited. As a result, when the packaging box 1 is assembled, the position where the second flap 31 stands up with respect to the corresponding wall part 21 (the position where it bends with respect to the wall part 21) is different from that of the fourth flap 31, as shown in FIG. It is located inside (inside the cylindrical body 2) of the position where it stands up with respect to the corresponding wall surface part 23 (the bending position with respect to the wall surface part 23). Therefore, even if the fourth flap 33 and the like are stacked on the outside of the second flap 31, the second flap 31 is prevented from tilting inward, and stands upright at an angle close to 90 degrees with respect to the corresponding wall portion 21. It can be done.

As shown in FIGS. 4 to 6, the second flap 31 is provided with a protrusion 37 on a portion of its tip edge that protrudes more than the other portion. The protrusion 37 is located at the center of the second flap 31 in the width direction. Further, the second flap 31 has a supporting piece 38 connected to its tip edge. A fold line L18 is provided at the boundary between the support piece 38 and the second flap 31, and the support piece 38 can be bent relative to the second flap 31. When the support piece 38 is bent inward with respect to the second flap 31 during assembly of the packaging box 1, as shown in FIGS. overlaps with In this embodiment, the support piece 38 is connected to a portion of the tip edge of the second flap 31 excluding the protruding portion 37, and is further connected to a portion of the second flap 31 excluding the bent portion 36. ing.

As shown in FIGS. 4 and 5 in the blank sheet 10, the protrusion 37 is formed by forming a U-shaped cut that protrudes toward the support piece 38 at the boundary between the second flap 31 and the support piece 38. and is provided integrally with the second flap 31. The U-shaped notches are provided at the boundary between the second flap 31 and the support piece 38 so as to extend in a direction perpendicular to the boundary, and include a pair of notches 53 of equal length and a support portion of the pair of notches 53. It is composed of a notch 52 provided so as to be continuous with both ends on the side of the piece 38, and the position of the notch 52 is the tip edge of the protrusion 37. When the support piece 38 is bent 90 degrees inward with respect to the second flap 31, the protrusion 37 protrudes from the tip edge of the second flap 31 beyond the support piece 38, as shown in FIG.

As shown in FIGS. 4 and 5, the second flap 31 is provided with a fold line L19 so as to be continuous with both ends of the pair of notches 53 on the second flap 31 side, and the protrusion 37 is formed on the second flap 31. It can be bent against. Note that the length between the tip edge of the protrusion 37 and the fold line L19 is d4. The length d4 is not particularly limited.

As shown in FIGS. 4 and 5, the fourth flap 33 has a substantially rectangular shape, and in this embodiment, a substantially trapezoidal shape. The length in the direction perpendicular to the width of the fourth flap 33 (the length from the tip edge of the fourth flap 33 to the boundary with the corresponding wall surface part 23) is determined as shown in FIG. 2 when the packaging box 1 is assembled. Since the fourth flap 33 is overlapped on the outside of the second flap 31, the length of the fourth flap 33 may be such that the tip edge of the fourth flap 33 exceeds the tip edge of the second flap 31. It may be shorter than d2.

The tip edge of the fourth flap 33 may extend linearly, for example, but as shown in FIGS. 4 and 5, it is preferable that at least the center in the width direction is recessed. The recess 33a on the tip edge of the fourth flap 33 can be formed in a U-shape, V-shape, circular arc shape, etc., but is preferably formed in a smoothly curved circular arc shape.

At the boundary between the fourth flap 33 and the corresponding wall surface portion 23, an engaging portion 39 is formed at the center in the width direction. When the packaging box 1 is assembled, the engaging part 39 is located at the boundary between the fourth flap 33 and the wall part 23, as shown in FIG. 10, and as shown in FIGS. , the protrusion 37 provided on the second flap 31 stacked on the inside of the fourth flap 33 can be inserted.

Next, the upper lid 4 will be explained. As shown in FIG. 4, the fifth to eighth flaps 40 to 43 constituting the upper lid 4 have a substantially rectangular shape in plan view, and in this embodiment, have a substantially rectangular shape. The fifth flap 40 and the seventh flap 42 have approximately the same width as the wall portions 20 and 22, and the sixth flap 41 and the eighth flap 43 have approximately the same width as the wall portions 21 and 23.

When the packaging box 1 is assembled, the fifth to eighth flaps 40 to 43 form the top lid 4 by being bent 90 degrees inward with respect to the wall portions 20 to 23, as shown in FIG. In the fifth to eighth flaps 40 to 43, in this embodiment, an eighth flap 43 is stacked on the outside of the fifth flap 40 and the seventh flap 42, and a sixth flap 41 is further stacked on the outside of the eighth flap 43. .

As shown in FIG. 4, the sixth flap 41 and the eighth flap 43 have a length in a direction perpendicular to their width (from the tip edge of the sixth flap 41 and the eighth flap 43 to the corresponding wall surface parts 21, 23). The length (to the boundary) d5 is approximately equal to the width d3 of the narrow wall portions 20, 22. Thereby, when the packaging box 1 is assembled, the upper lid 4 closes the other opening of the body 2 with the sixth flap 41 and the eighth flap 43, as shown in FIG.

As shown in FIG. 4, the sixth flap 41 has an insertion piece 44 connected to the center of its distal end in the width direction. A fold line L20 is provided at the boundary between the insertion piece 44 and the sixth flap 41, and the insertion piece 44 can be bent relative to the sixth flap 41. At the boundary between the insertion piece 44 and the sixth flap 41, a lock hole 45 is formed at the center in the width direction. When the packaging box 1 is assembled, the lock hole 45 is located at the boundary between the insertion piece 44 and the sixth flap 41, as shown in FIG. . A recess 46 is continuously formed in the center of the lock hole 45 in the width direction. The recess 46 is formed by cutting out the sixth flap 41 from the boundary with the insertion piece 44 in a concave shape. The recess 46 is large enough to allow at least one user's finger to be inserted, and by inserting the user's finger into the recess 46, the sixth flap 41 can be easily bent relative to the corresponding wall portion 21.

As shown in FIG. 4, a pair of L-shaped notches 54 are formed at the boundary between the eighth flap 43 and the corresponding wall surface portion 23, with the locking piece 26 in between. Thereby, when the eighth flap 43 is bent against the wall section 23 as shown in FIG. 1 during assembly of the packaging box 1, an insertion hole 47 is formed at the boundary with the wall section 23. The insertion piece 44 connected to the sixth flap 41 can be inserted into the insertion hole 47 .

Next, a procedure for assembling the storage box 1 shown in FIGS. 1 and 2 using the blank sheet 10 shown in FIG. 4 will be described.

First, the fixing piece 34 is connected to the first flap 30 via the fold line L15, the bending piece 36 is connected to the second flap 31 via the fold line L17, and the fixing piece is connected to the third flap 32 via the fold line L16. The pieces 35 are each folded in a direction toward the outside when formed into a packaging box. Furthermore, while bending the first to fourth flaps 30 to 33 inward with respect to the wall sections 20 to 23, a fixing piece 34 connected to the first flap 30 and a fixing piece connected to the third flap 32 are simultaneously bent. The piece 35 is attached to the outer surfaces of the second flap 31 and the fourth flap 33 that are adjacent to one side of the first flap 30 and the third flap 32, respectively, and the glue allowance section 24 is attached to the inside of the wall section 20. By doing so, as shown in FIG. 12, a packaging box 1 with a flat body 2 before assembly is formed. The packaging box 1 is generally supplied to a user in the state shown in FIG.

When the packaging box 1 is used, the body part 2 is made into a cylindrical state so that the first to fourth flaps 30 to 33 stand up against the wall parts 20 to 23 to form the bottom lid 3 again. At this time, the support piece 38 connected to the second flap 31 is bent at the fold line L18, and the protrusion 37 formed thereby is inserted into the engagement portion located at the boundary between the fourth flap 33 and the corresponding wall surface portion 23. Insert it into section 39. Thereby, the second flap 31 is maintained in an upright state with respect to the corresponding wall surface portion 21 without collapsing inward.

Finally, in order to form the upper lid 4, first, the opposing fifth flap 40 and seventh flap 42 are bent inward against the wall parts 20 to 23, and then the eighth flap 43 and the sixth flap 42 are folded inward. Fold the flaps inward in the order of flap 41 and overlap them. Then, as shown in FIG. 1, by inserting the insertion piece 44 of the sixth flap 41 into the insertion hole 47 located at the boundary between the eighth flap 43 and the corresponding wall section 23, the upper lid 4 is closed. will be maintained. Furthermore, by inserting the locking piece 26 of the wall portion 23 into the locking hole 45 located at the boundary between the insertion piece 44 and the sixth flap 41, opening of the sixth flap 41 and unsealing of the top cover 4 is restricted. Ru. When inserting the locking piece 26 into the lock hole 45, the locking piece 26 can be easily inserted into the lock hole 45 by tilting the movable piece 25 outward.

As mentioned above, when the packaging box 1 of this embodiment described above is not in use, the first to fourth flaps 30 to 33 forming the bottom cover 3 can be folded into the inside of the body part 2, as shown in FIG. As shown in FIG. 12, the packaging box 1 can be deformed so that the body 2 is in a flat state. Thereby, it is possible to save space for transporting and storing the unused packaging box 1. On the other hand, when the packaging box 1 is used, as shown in FIG. - The second flap 31, which is the innermost of the fourth flaps 30 to 33, is restricted from falling into the interior of the trunk 2. Therefore, when the packaging box 1 is used (for example, transported or stored) with the bottom lid 3 on its side, even if a load (compression load) is applied to the packaging box 1 in a direction that compresses the bottom lid 3 from above, the It is possible to suppress the packaging box 1 from being deformed so that the first to fourth flaps 30 to 33 are folded into the interior of the body 2 and the body 2 becomes flat. In this way, the packaging box 1 of the present embodiment has a structure that ensures strength against the compressive load received when the bottom cover 3 is used with the bottom lid 3 lying on its side, although it employs a one-touch bottom.

Further, in the packaging box 1 of this embodiment, as shown in FIGS. 8 and 9, the second flap 31 is provided with a supporting piece 38 in a state of being bent inward, and the supporting piece 38 is connected to the fourth flap 33. Since the support piece 38 overlaps the inside of the continuous wall portion 23, the support piece 38 supports the wall portion 23 with a restoring force that tends to return to the outside. Therefore, even if the packaging box 1 receives a compressive load when the packaging box 1 is used with the bottom lid 3 on its side, the compressive load is absorbed by the wall portion 23, so the compressive load acting on the second flap 31 is reduced. be done. In this way, the packaging box 1 of the present embodiment has a structure in which the second flap 31 is difficult to buckle due to compressive loads, so that the protruding part 37 of the second flap 31 comes out of the engaging part 39 and the second flap 31 can be effectively prevented from folding into the interior of the body section 2.

Moreover, in the packaging box 1 of this embodiment, as shown in FIG. It is located on the inside of the position where you stand up. If both positions are not shifted, the inner second flap 31 is pushed inward by the outer fourth flap 33 and stands up against the wall portion 21 in an inwardly inclined state. In this state, when the packaging box 1 receives a compressive load when the packaging box 1 is used with the bottom lid 3 on its side, the compressive load acting on the second flap 31 causes the second flap 31 to move inside the body 2. It becomes easier to fall down. On the other hand, in the packaging box 1 of the present embodiment, both positions are shifted and the second flap 31 is on the inside, so the second flap 31 stands up substantially perpendicularly to the wall portion 21. Therefore, the packaging box 1 of this embodiment has a structure in which the second flap 31 does not easily fall inward even if a compressive load is applied to the second flap 31, so that the protrusion 37 of the second flap 31 is not engaged. It is possible to effectively prevent the second flap 31 from slipping out of the joint portion 39 and folding into the interior of the body portion 2 .

Furthermore, in the packaging box 1 of this embodiment, as shown in FIGS. 4 and 5, a fold line L19 is formed in the second flap 31 at a position a predetermined length d1 away from the tip edge of the protrusion 37, The protrusion 37 is easily bent relative to the second flap 31. When the packaging box 1 receives a compressive load when the packaging box 1 is used with the bottom lid 3 on its side, the compressive load acting on the second flap 31 is concentrated on the protrusion 37, but there is no crease L19 and the protrusion 37 If it is difficult to bend with respect to the second flap 31, there is a risk that the protruding portion 37 will be easily crushed and come out of the engaging portion 39. On the other hand, in the packaging box 1 of this embodiment, when the compressive load is concentrated on the protrusion 37 of the second flap 31, the protrusion 37 is bent at the fold line L19, so that the protrusion 37 is not easily crushed. The protruding portion 37 is prevented from slipping out from the engaging portion 39. In this way, the packaging box 1 of the present embodiment has a structure in which the protruding part 37 of the second flap 31 is not easily crushed by the compressive load, so that the protruding part 37 of the second flap 31 is separated from the engaging part 39. It is possible to effectively prevent the second flap 31 from coming off and folding into the interior of the body portion 2 .

Moreover, in the packaging box 1 of this embodiment, as shown in FIG. 2, the tip edge of the fourth flap 33 is formed in a shape in which the center in the width direction is recessed. As a result, when the packaging box 1 is used with the bottom lid 3 on its side, the packaging box 1 receives a compressive load, and accordingly, the leading edge of the fourth flap 33 hits the second flap 31 stacked on the inside thereof. In this case, the fourth flap 33 has a concave shape at the widthwise center of its tip edge, so that the widthwise center of the second flap 31 (particularly where the protrusion 37 is ) is weakened. In this way, the packaging box 1 of this embodiment has a structure in which the second flap 31 does not easily fall inward even when pushed by the fourth flap 33, so that the protrusion 37 of the second flap 31 39 and the second flap 31 from folding into the interior of the body 2 can be effectively suppressed.

Moreover, in the packaging box 1 of this embodiment, as shown in FIG. As shown in FIGS. 3 and 7, a gap S is formed between the tip edge of the second flap 31 and the inner surface of the opposing wall surface portion 23, which is shorter than the width d3 of the portion 22. As shown in FIGS. If the packaging box 1 is subjected to a compressive load when the packaging box 1 is used with the bottom lid 3 on its side, the tip edge of the second flap 31 may come into contact with or be close to the inner surface of the wall portion 23. , the compressive load is directly transmitted to the second flap 31, and there is a possibility that the second flap 31 will buckle early. On the other hand, in the packaging box 1 of this embodiment, the gap S is formed between the tip edge of the second flap 31 and the inner surface of the wall section 23, so that the second flap 31 is free from the compressive load. Transmitted in a relaxed manner. In this way, the packaging box 1 of the present embodiment has a structure in which the second flap 31 is difficult to buckle due to compressive loads, so that the protruding part 37 of the second flap 31 comes out of the engaging part 39 and the second flap 31 can be effectively prevented from folding into the interior of the body section 2.

Although the embodiments of the present invention have been described above, the specific aspects of the present invention are not limited to the above-described embodiments, and various modifications can be made without departing from the spirit thereof.

For example, as a modified example, in the embodiment described above, the second flap 31 may not have the support piece 38 continuous to its tip edge.

As another modification, in the embodiment and modification described above, the position where the second flap 31 stands up with respect to the wall surface part 21 and the position where the fourth flap 33 stands up with respect to the wall surface part 23 are misaligned. You don't have to.

As another modification, in the embodiment and modification described above, the second flap 31 is not provided with the crease L19 or the pair of notches 53 that enable the protrusion 37 to be bent relative to the second flap 31. Good too.

As another modification, in the embodiment and modification described above, the length d1 of the second flap 31 shown in FIG. 5 may be equal to the width d3 of the wall portions 20 and 22.

As another modification, in the embodiment and modification described above, the tip edge of the fourth flap 33 does not need to be concave at the center in the width direction, but may have a straight shape, an inclined line shape, a shape in which the center in the width direction protrudes, etc. It may be.

As another modification, the shapes of the fifth to eighth flaps 40 to 43 constituting the upper lid 4 are not limited to the examples of the embodiment described above, and may be any conventionally known shape as long as they can be opened and closed. There may be.

1 Packaging box 2 Body part 3 Bottom lid 20 Wall part with the first flap attached 21 Wall part with the second flap attached 22 Wall part with the third flap attached 23 Wall part with the fourth flap attached Wall surface part 30 First flap 31 Second flap 32 Third flap 33 Fourth flap 34 Fixed piece 35 Fixed piece 37 Projection part 38 Support piece 39 Engagement part L19 Crease

Claims (6)

comprising four wall parts forming a body part, and first to fourth flaps forming a bottom cover that closes one opening of the body part and being connected to the wall part,
The first to fourth flaps are folded into the interior of the body when the body is in a flat state, and the opposing first and third flaps each have a second flap and a second flap adjacent to one side, respectively. A fixing piece is attached to the outer surface of the fourth flap, and the first to fourth flaps stand up against the wall when the body is in a cylindrical state. A packaging box forming a bottom lid,
The second flap is provided with a protrusion on a part of its tip edge,
An engaging portion is formed at a boundary between the fourth flap and a wall portion to which the fourth flap is connected,
The second flap is overlapped inside the fourth flap, and the protrusion is inserted into the engagement part ,
A packaging box characterized in that a leading edge of the fourth flap is recessed at least in the center . The second flap has a support piece connected to its tip edge,
The packaging box according to claim 1, wherein the support piece overlaps the inside of a wall portion to which the fourth flap is connected. The position of the second flap that stands up with respect to the wall surface portion to which the second flap is connected is inner than the position of the fourth flap that stands up with respect to the wall surface portion that the fourth flap is connected to. The packaging box according to claim 1 or 2, characterized in that: The second flap is characterized in that a crease is formed at a position a predetermined distance away from the tip edge of the protrusion, and the protrusion is bendable relative to the second flap. The packaging box according to any one of claims 1 to 3. The packaging box according to any one of claims 1 to 4 , characterized in that there is a gap between the tip edge of the second flap and an inner surface of a wall portion to which the fourth flap is connected. . comprising four wall parts forming a body part, and first to fourth flaps forming a bottom cover that closes one opening of the body part and being connected to the wall part,
The first to fourth flaps are folded into the interior of the body when the body is in a flat state, and the opposing first and third flaps each have a second flap and a second flap adjacent to one side, respectively. A fixing piece is attached to the outer surface of the fourth flap, and the first to fourth flaps stand up against the wall when the body is in a cylindrical state. A packaging box forming a bottom lid,
The second flap is provided with a protrusion on a part of its tip edge,
An engaging portion is formed at a boundary between the fourth flap and a wall portion to which the fourth flap is connected,
The second flap is overlapped inside the fourth flap, and the protrusion is inserted into the engagement part,
A packaging box characterized in that a gap is formed between the tip edge of the second flap and an inner surface of a wall portion to which the fourth flap is connected.

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