JP7166829B2 - box - Google Patents

Description

The present invention relates to a one-touch bottom assembly type box.

Conventionally, as a one-touch bottom assembly type cardboard box, a square tube-shaped body, an outer flap connected to the lower edge of the longitudinal surface of the body, and a lower edge of the short side of the body. The outer flap and the inner flap are folded so as to be sequentially overlapped in the circumferential direction, each inner flap and the outer flap superimposed on the outer surface of the inner flap are adhered, and the overlapping portion is It is known that a crease line is provided at 45° from the corner (see Patent Document 1, for example).

As a result, the one-touch bottom-assembled corrugated cardboard box can automatically close the bottom when the body of the box is deformed from a flat folded state into a rectangular tubular shape.

However, in this type of one-touch bottom-assembled corrugated cardboard box, the bottom surface is not only sealed as a result of deformation, but is also designed to prevent the body portion from unexpectedly returning to a flat folded state and opening the bottom surface. , is required to be lockable.

Therefore, in the one-touch bottom assembled corrugated cardboard box, the height of a part of the outer flap (the distance from the base edge to the tip edge) is more than half the length of the body in the transverse direction. The sections are staggered with respect to the opposing outer flaps.

Thus, in the one-touch bottom-assembled cardboard box, when the body portion is deformed into a square tube shape, the extending portions of the outer flaps ride on the other outer flap, thereby locking the bottom surface.

JP 2011-152927 A

However, in the one-touch bottom assembled cardboard box, the length of the outer flap must be longer than half the length of the body in the short direction in order to provide the extension, so the area of the corrugated paperboard used is large. There is a problem that it increases and the cost increases.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a one-touch bottom assembly type box that can reduce the material cost by reducing the area of paperboard used as a material.

The box of the present invention has a vertically extending rectangular tube-shaped body, and a bottom plate that closes the lower open end of the body when the body is deformed from a flat folded state to a rectangular tube state. , wherein the body comprises a pair of first side plates facing each other, and the body portion facing each other in a direction intersecting the facing direction of the pair of first side plates, and having a width equal to or less than the first side plates. and a pair of second side plates are connected via a vertical fold line, and the bottom plate portion is connected to the lower edge of the first side plate via the first horizontal fold line and is connected to the base end a pair of first flaps whose length from the tip to the tip is less than half the width of the second side plate; a pair of second flaps whose length from the proximal end to the distal end of the first flap is less than or equal to the length from the base end to the tip of the first flap, and the first flap and the second flap are folded so as to sequentially overlap in the circumferential direction and a pair of connecting plates in which one of the first flaps and the one of the second flaps are bonded together in an overlapping region, and each connecting plate includes the first flap and the In the region where the second flap overlaps, an inclined fold line is provided that extends obliquely from the corner of the bottom plate portion to the inner edge of each connecting plate, and the inner edge of one connecting plate is attached to the other connecting plate. A slit is formed in one of the two regions that overlap with each other, and a fitting edge is formed in the other region. A fitting edge is formed to be fitted into a slit formed in the inner edge of the one connecting plate when it is closed, and the inner edge of the one connecting plate when the body is deformed into a square tube shape in the other region. A slit is formed in each connecting plate to be inserted into the fitting edge formed in the above, and each connecting plate is provided with the slit and the fitting from the intersection of the proximal edges of the first flap and the second flap that constitute the connecting plate. An inclined crease line extends from the inner edge between the edges, and a curved cut portion extending in a direction away from the inclined crease line is provided at the tip of the slit .

In the box of the present invention, the pair of first flaps and the pair of second flaps are folded so as to sequentially overlap in the circumferential direction, thereby closing the lower open end of the body as a bottom plate.

By the way, the folded first flap and the second flap form a pair of connecting plates by being adhered in the overlapping region of the one first flap and the one second flap, and each connecting plate The plate is provided with an inclined crease line extending obliquely from the corner of the bottom plate portion to the inner edge of each connecting plate in the region where the first flap and the second flap constituting each connecting plate overlap each other. Therefore, when the trunk portion is flattened, the connecting plate is folded into a mountain fold or a valley fold accordingly. Conversely, when the body is formed into a square tube, the flatly folded connection plate is pulled by the body and stretched to return to a flat plate shape.

Therefore, according to the box of the present invention, when the trunk is deformed from a flat folded state into a square tube shape, the pair of connecting plates becomes the bottom plate portion and the lower open end of the trunk is opened. can be closed.

Further, of the pair of connecting plates, the inner edge of one connecting plate has a slit formed in one of two regions overlapping with the other connecting plate, and a fitting edge formed in the other region. The inner edge of the connecting plate is formed with a fitting edge that fits into the slit when the body is deformed into a square tube shape in the one area, and the body part is deformed into a square tube shape in the other area. A slit is formed to be fitted into the fitting edge formed on the inner edge of the one connecting plate when it is closed.

Therefore, when the trunk portion is deformed into a square tube shape and the connecting plate is gradually extended, the fitting edge corresponding to each slit is fitted and the bottom plate portion is locked.

By the way, since the height (length from the base end to the tip) of the first flap connected to the first side plate is half or less of the width of the second side plate in the short direction of the bottom plate portion, The first flaps do not overlap each other when the bottom plate portion is formed.

Further, the height of the second flap connected to the second side plate having the width equal to or less than the first side plate is equal to or less than the height of the first flap. Therefore, when the bottom plate portion is formed, naturally the second flap They do not overlap each other.

Therefore, according to the one-touch bottom-assembled box of the present invention, the bottom plate portion can be locked in the same manner as the conventional one-touch bottom-assembled box, and the used area of the paperboard as a material is reduced compared with the conventional one. material costs can be reduced.

In addition, the box of the present invention has a vertically extending rectangular tube-shaped body, and when the body is deformed from a flat folded state to a rectangular tube state, the lower open end of the body is closed. In a one-touch bottom assembly type box body including a bottom plate portion, the body portion is opposed to a pair of first side plates facing each other in a direction intersecting the facing direction of the pair of first side plates and has a width of the first side plate. It is formed by connecting a pair of second side plates below the side plates via a vertical fold line, and the bottom plate portion is connected to the lower edge of the first side plate via a first horizontal fold line. A pair of first flaps whose length from the base end to the tip end is less than half the width of the second side plate, and a pair of first flaps connected to the lower edge of the second side plate via the second horizontal fold line and extending from the base end to the tip end a pair of second flaps whose length is less than or equal to the length from the proximal end to the distal end of the first flap, and the first flap and the second flap are folded so as to sequentially overlap in the circumferential direction A pair of connection plates in which one of the first flaps and the one of the second flaps are overlapped with each other in an overlapping state, and each connection plate includes the first flap that constitutes the connection plate. In the region where the flap and the second flap overlap, an inclined crease line is provided that extends obliquely from the corner of the bottom plate portion to the inner edge of each connecting plate, and in each of the regions where both connecting plates overlap each other, A slit is provided at the tip of one connecting plate in a direction away from the tip edge, and a fitting edge that fits into the slit is provided at the side edge of the other connecting plate, and the tip of the slit is the inclined fold line. and the fitting edge intersects the slit when the body is in the square tube state and is perpendicular to the overlapping region when the body is in the square tube state. It is formed by notching so that the side edge of the other connecting plate is spaced apart from the vertical crease line when the body is folded, rather than the side edge of the one connecting plate. When the part is deformed from the folded state to the square tube state, it is fitted between the slits opened by pushing the one of the positions adjacent to the slits of the one connecting plate that is closer to the fitting edge. Characterized by

In the box of the present invention, the pair of first flaps and the pair of second flaps are folded so as to sequentially overlap in the circumferential direction, thereby closing the lower open end of the body as a bottom plate.

By the way, the folded first flap and the second flap form a pair of connecting plates by being adhered in the overlapping region of the one first flap and the one second flap, and each connecting plate The plate is provided with an inclined crease line extending obliquely from the corner of the bottom plate portion to the inner edge of each connecting plate in the region where the first flap and the second flap constituting each connecting plate overlap each other. Therefore, when the trunk portion is flattened, the connecting plate is folded into a mountain fold or a valley fold accordingly. Conversely, when the body is formed into a square tube, the flatly folded connection plate is pulled by the body and stretched to return to a flat plate shape.

Therefore, according to the box of the present invention, when the trunk is deformed from a flat folded state into a square tube shape, the pair of connecting plates becomes the bottom plate portion and the lower open end of the trunk is opened. can be closed.

Further, of the pair of connecting plates, the inner edge of one connecting plate has a slit formed in one of two regions overlapping with the other connecting plate, and a fitting edge formed in the other region. A fitting edge that fits into the slit is formed on the inner edge of the connecting plate, and a slit that fits into the fitting edge formed on the inner edge of the one connecting plate is formed in the other region.

When the trunk portion is in the folded state, the fitting edge is positioned relative to the vertical crease line orthogonal to the overlapped region when the trunk portion is in the rectangular tube state, relative to the side edge of the one connecting plate when the trunk portion is in the folded state. On the other hand, since the side edge of the connecting plate is notched so as to be spaced apart, if the case where the connecting plate is folded in a valley fold will be described as an example, one side will be below the fitting edge (inside the box). The side edges of the connecting plate enter. Further, as the deformation progresses, the tip edges of the two connecting plates approach the center of the bottom plate portion, so that the fitting edge gradually slides on the outer surface of the connecting plate provided with the slit to the connecting plate. The plate is relatively pushed in from the outer surface to the inner surface.

As a result, of the positions adjacent to the slits of the one connecting plate, the positions close to the fitting edges are pushed in to open the slits, and the fitting edges are fitted between the opened slits to lock the bottom plate. be done.

By the way, since the height (length from the base end to the tip) of the first flap connected to the first side plate is half or less of the width of the second side plate in the short direction of the bottom plate portion, The first flaps do not overlap each other when the bottom plate portion is formed.

Further, the height of the second flap connected to the second side plate having the width equal to or less than the first side plate is equal to or less than the height of the first flap. Therefore, when the bottom plate portion is formed, naturally the second flap They do not overlap each other.

Therefore, according to the one-touch bottom-assembled box of the present invention, the bottom plate portion can be locked in the same manner as the conventional one-touch bottom-assembled box, and the used area of the paperboard as a material is reduced compared with the conventional one. material costs can be reduced.

Further, in the box of the present invention, the fitting edge protrudes from a position closer to the inner edge of the connecting plate than the position where the body intersects the slit when the body is in the rectangular tube state to the tip side of the slit. It is preferable that a fitting protrusion is formed.

As a result, the bottom plate portion can be locked more firmly than the box body of the present invention in which the fitting projection portion is not formed.

The bottom perspective view which shows the packaging box of this embodiment. The development view of the packaging box in this embodiment. FIG. 3A is an explanatory diagram illustrating the process of deforming the packaging box of the present embodiment from a flat folded state into a rectangular tubular shape, FIG. 3B is an explanatory view showing a state in which the fitting protrusion 32b is started to be fitted into the slit 31d; FIG. FIG. 3C is an explanatory diagram showing a state in which the bottom plate portion is formed by fitting into the slit 31d. The top view of the bottom-plate part of the packaging box in a rectangular tube state. FIG. 10 is an exploded view of a one-touch bottom assembly type packaging box according to a modification of the present invention. FIG. 10 is an exploded view of a one-touch bottom assembly type packaging box according to a modification of the present invention.

As shown in FIG. 1, the packaging box 1 of the one-touch bottom assembly type of the present embodiment includes a square tubular body 10, a top plate 20 closing the upper open end of the body 10, and the body It is formed in the shape of a rectangular parallelepiped with a bottom plate portion 30 that closes the lower open end of the portion 10 .

The trunk portion 10 is composed of a pair of first side plates 11 facing each other in an upright state and a pair of second side plates 12 facing each other in a direction intersecting the facing direction of the pair of first side plates.

In the packaging box 1 of the present embodiment, the width of the second side plate 12 is designed to be shorter than the width of the first side plate 11, and the first side plate 11 has a so-called long side and the second side plate 12 has a so-called short side. ing.

The top plate portion 20 consists of a pair of outer flaps 21 and a pair of inner flaps 22 as will be described later.

The bottom plate portion 30 consists of a pair of first flaps 31 and a pair of second flaps 32 (see FIG. 2). The first flap 31 and the second flap 32 are horizontally bent inward with respect to the body.

Also, the first flap 31 and the second flap 32 are sequentially overlapped in the circumferential direction. 1, the right inner surface of the first flap 31 on the back side overlaps the outer surface on the back side of the second flap 32 on the right side, and the second flap 31 on the left side overlaps the outer surface on the left side of the first flap 31 on the back side. The inner surface of the back side of the flap 32 is overlapped, the left inner surface of the first flap 31 on the front side is overlapped with the outer surface of the front side of the second flap 32 on the left side, and the outer surface of the right side of the first flap 31 on the front side is overlapped with the outer surface of the right side. is superimposed on the inner surface of the front side of the second flap 32 of the second flap 32, and is sequentially superimposed in the counterclockwise direction as a whole.

By bonding the second flaps 32 and the first flaps 31 superimposed on the outer surfaces of the second flaps 32, a total of two pairs of connecting plates 33 that are substantially L-shaped in bottom view are formed. Here, the inner edge of the connecting plate 33 in the present invention means the tip edge of the first flap 31 and the second flap 32 that constitute each connecting plate 33 . The bottom plate portion 30 is formed by combining the two sets of connecting plates 33, and the lower open end of the body portion 10 is closed.

As shown in FIG. 2, the packaging box 1 is formed from a single piece of corrugated board 1A.

The corrugated paperboard 1A has a first side plate 11 and a second side plate 12 which are alternately connected from the left side in the horizontal direction via vertical folding lines a1, a2, and a1, respectively. Further, an adhesive piece 13 is connected to the side edge of the first side plate 11 on the right side through a vertical folding line b.

An outer flap 21 is connected to the upper edge of each first side plate 11 via a first upper lateral fold line c1. Similarly, an inner flap 22 is connected to the upper edge of each second side plate via a second upper lateral fold line d1. The upper edge of the inner flap 22 is tapered toward the tip at both ends and narrower than the lower edge.

A first flap 31 is connected to the lower edge of each first side plate 11 via a first lower lateral fold line c2.

Each first flap 31 is formed with an inclined fold line 31a extending from the left end of the first lower horizontal fold line c2 toward the central portion of the tip edge of the first flap 31. As shown in FIG. In this embodiment, the inclined crease line 31a extends to the leading edge of the first flap 31 at an angle of 45° with respect to the first lower lateral crease line c2.

A substantially triangular region on the left side of the inclined crease line 31a of the first flap 31 is a bonding region 31b that is bonded to the second flap adjacent on the left side during assembly. A substantially triangular notch 31c is formed at a corner of the adhesive region 31b on the base end side of the inclined crease line 31a.

A slit 31d is formed in each of the first flaps 31 in an orthogonal direction from the leading edge toward the first lower horizontal folding line c2. A curved cut portion 31e extending parallel to the first lower horizontal fold line c2 is continuously provided at the tip of the slit 31d. At the proximal end of the slit 31d, a substantially triangular notch 31f that gradually expands leftward from the intermediate portion of the slit toward the distal edge of the first flap 31 is formed.

A second flap 32 is connected to the lower edge of each second side plate 12 via a second lower lateral fold line d2. Each second flap 32 has a substantially inverted trapezoidal shape with the second lower lateral fold line d2 as the upper base and the tip edge as the lower base.

The portion corresponding to the left leg of the inverted trapezoid of the second flap 32 is the fitting edge 32a, and the fitting protrusion 32b projecting leftward from the tip of the fitting edge 32a extends along the tip edge of the second flap. are provided.

Each of the outer flap 21, the inner flap 22, the first flap 31, and the second flap 32 described above has a height (the length from the proximal end to the distal end; the same shall apply hereinafter) of about half the lateral width of the second side plate 12. is formed in

Next, the process of assembling the packaging box 1 from the corrugated board 1A will be described.

First, the first flap 31 is folded back along the first lower horizontal folding line c2 so as to overlap the inner surface of the first side plate 11 . Similarly, the second flap 32 is folded back along the second lower lateral fold line d2 so as to overlap the inner surface of the second side plate 12. As shown in FIG.

Next, the adhesive region 31b is folded back along the inclined crease line 31a so as to overlap the outer surface of the first flap 31, and an adhesive is applied to the inner surface.

Next, the left second side plate 12 is folded back along the vertical folding line a1 so as to overlap the inner surface of the left first side plate 11 . As a result, the outer surface of the left second flap 32 is adhered to the inner surface of the adhesive region 31b of the left first flap 31 by the adhesive to form the connecting plate 33 . Similarly, the first right side plate 11 is folded back along the vertical folding line a1 so as to overlap the inner surface of the second right side plate 12 . As a result, the outer surface of the right second flap 32 is adhered to the inner surface of the adhesive region 31b of the right first flap 31 by the adhesive to form the connecting plate 33 .

Finally, the outer surface of the adhesive piece 13 connected to the first right side plate 11 is superimposed and adhered to the inner surface of the left edge of the second left side plate 12 to form the body portion 10 . .

As described above, the flat folded packaging box 1 is formed.

Next, the process of forming the bottom plate portion 30 by transforming the trunk portion 10 of the packaging box from the folded state into the rectangular tube state will be described.

In order to transform the body portion 10 of the packaging box from the folded state to the square tube state, the vicinity of both vertical folding lines a1 facing each other are pushed in so as to approach each other.

As a result, the first side plate 11 and the second side plate 12, which have been folded back at approximately 180° along the vertical crease line a1 in the folded state, gradually open until the angle they form becomes approximately 90°. At this time, the first side plate 11 and the second side plate 12, which are adjacent to each other via the vertical fold line a2 or the vertical fold line b, are arranged so that the angle between the vertical fold line a2 and the vertical fold line a approaches approximately 90 degrees from 0°. It is folded along the folding line b. As a result, the trunk portion 10 is deformed into a rectangular tubular shape along the vertical folding lines a1 and a2 from the flat folded state.

The steps in which the bottom plate portion 30 is gradually formed at this time will be sequentially described with reference to FIGS. 3A to 3C.

First, as shown in FIG. 3A, when the trunk is deformed into a square tube shape from a flat folded state, the vertical crease line a2 and the crease line b of the trunk portion 10 are folded flat and close to each other. It gradually separates from the state where it was. At this time, the ends of the connecting plate 33 adjacent to the vertical crease line a2 and the crease line b are also pulled in this direction, so that they are folded along the inclined crease line 31a. Both connecting plates 33 are also gradually extended into a flat plate shape.

At this time, in the flat folded state before deformation, the vertical fold line a2 (or the vertical fold line b) is arranged adjacent to the side edge of each first flap 31 and the insertion edge 32a of the second flap 32. The distance to this vertical fold line a2 (or vertical fold line b) is greater at the fitting protrusion 32b provided at the tip of the fitting edge 32a than at the tip of the side edge of the first flap 31. Therefore, when the connecting plate 33 expands, the tip of the first flap 31 of the one connecting plate 33 moves toward the inside of the box relative to the fitting edge 32a of the second flap 32 of the other connecting plate 33. get into

Further, when the trunk portion 10 is deformed into a square tube shape from a flat folded state, the fitting protrusion 32b of the second flap 32 of the other connecting plate 33 is moved to the outer surface of the first flap 31 of the one connecting plate 33. , and slides toward the proximal end of the slit 31d.

As the connecting plate 33 expands, the fitting projection 32b moves relative to the front side of the slit 31d of the first flap 31 of the one connecting plate 33 (closer to the fitting projection 32b). is pressed inward (downward in FIG. 3A).

As a result, as shown in FIG. 3B, the near side of the slit 31d bends downward due to the elastic force of the cardboard, and the slit 31d opens, so that the fitting protrusion 32b and the fitting edge 32a are slid into the gap.

In particular, in the present embodiment, a bent cut portion 31e is provided continuously at the tip of the slit 31d toward the near side (closer to the fitting edge 32a) of the slit 31d. As a result, when the front side of the slit 31d of the first flap 31 is pushed downward, a virtual line parallel to the slit 31d from the tip of the bent cut portion 31e is used as a rotation axis, and the distance from the virtual line to the slit 31d is increased. Since the area rotates downward to form a slope, it is easier to insert the fitting protrusion 32b and the fitting edge 32a into the slit 31d.

Further, in the present embodiment, a notch 31f is provided on the far side of the slit 31d in the first flap 31 (farther from the fitting protrusion 32b). As a result, the clearance at which the fitting protrusion 32b starts to slide into the slit 31d is increased, so that the fitting protrusion 32b and the fitting edge 32a can be easily fitted into the slit 31d.

Finally, when the trunk portion 10 is completely deformed into a square tube shape, the connecting plate 33 is expanded into a flat plate shape, and as shown in FIG. 30 is assembled and the lower open end of the barrel 10 is closed.

At this time, when the bottom plate portion 30 is viewed from above the packaging box, as shown in FIG. Therefore, even if an unexpected force acts in the direction of returning from the rectangular tubular shape to the folded state, the fitting protrusion 32b is unlikely to pass through the slit 31d again, so the bottom plate portion 30 is held.

In particular, in the present embodiment, the bending cut portion 31e is continuously provided at the tip of the slit 31d, and the tip of the fitting protrusion 32b is forcibly bent with the virtual line as a rotation axis, and the paperboard is forcibly bent from the virtual line. It is dimensioned so that it can just barely pass near the tip of the bent cut portion 31e in a state where the area up to the slit 31d is rotated downward. Therefore, when the fitting projection 32b has passed through and the forcibly bent region is flattened by the restoring force of the corrugated cardboard, even if the fitting projection 32b tries to return in the opposite direction, the fitting projection 32b does not move. , collides with the corner of the forcibly bent portion (near the intersection of the proximal end of the bent cut portion 31e and the distal end of the slit 31d), it is difficult to pass through the slit 31d and return to the position at hand.

As described above, according to the packaging box of the present embodiment, even if an unexpected force acts on the trunk portion 10 in the direction of returning from the rectangular tubular shape to the folded state, the fitting projection portion 32b locks the trunk portion 10. It is possible to prevent the assembled bottom plate portion 30 from being disassembled.

In addition, in the packaging box of this embodiment, the height of the first flap 31 is about half the width of the second side plate 12, so compared to the conventional one-touch bottom assembly type packaging box, the area of the corrugated paperboard 1A can be reduced. It can be made smaller in the vertical direction.

In addition, in the packaging box of the present embodiment, notches 31c are formed in the corners of the pair of first flaps 31, so that when the body portion 10 is flatly folded, the vertical folding lines a2 and Since the vicinity of the folding line b can be thinned, the trunk portion 10 can be easily flattened.

In addition, since both ends of the leading edge of the inner flap 22 are chamfered, the outer flap 21 and the inner flap 22 adjacent to each other do not come into contact with each other and interfere when the body portion 10 of the packaging box 1 is deformed. Because it is small, it is easy to deform.

[Modification]
Other modifications will be described with reference to FIGS. 5 and 6. FIG.

In the above-described embodiment, as the fitting protrusion 32b, a shape protruding leftward in parallel to the second lower horizontal crease line d2 from the substantially inverted trapezoidal leg of the second flap 32 will be described as an example. However, the present invention is not limited to this, and for example, it may be made to protrude in the upper left direction like the fitting protrusion 232b shown in FIG. According to this configuration, the locking by the fitting protrusion 232b becomes stronger. Alternatively, it may protrude in the lower left direction like the fitting protrusion 332b shown in FIG. 6. According to this configuration, the user can easily dismantle the packaging box after use.

Further, in the present embodiment, the slits 31d are formed in the orthogonal direction from the leading end edge of each first flap 31 toward the first lower lateral fold line c2, but the slits 231d shown in FIG. You may incline to the left side like . According to this configuration, the locking by the fitting protrusion 232b becomes stronger. Alternatively, it can be tilted to the right to make it easier for the user to dismantle the packaging box after use. In addition, the slit 31d may have a groove shape with a slightly large width.

Other modified examples (not shown) will be described below.

In the present embodiment described above, the packaging box having the top plate portion 20 was described as an example, but the present invention is not limited to this, and a box body such as a tray that does not have the top plate portion 20 may be used.

In the present embodiment described above, a rectangular parallelepiped packaging box in which the first side plate 11 has so-called long sides and the second side plate 12 has so-called short sides has been described as an example. The side plate 11 and the second side plate 12 may be rectangular parallelepipeds having the same width, or may be cubic.

In addition, in the above-described embodiment, the height of each outer flap 21 and the height of each inner flap 22 are both about half the width of the second side plate 12, but the present invention is not limited to this. For example, the inner flap 22 may not be formed, or the so-called B-type shape with one outer flap may be used.

In the above-described embodiment, the first flap 31 and the second flap 32 are sequentially overlapped in the counterclockwise circumferential direction, but they may be overlapped in the clockwise direction.

In the above-described embodiment, the connecting plate 33 is an example in which the first flap 31 is overlapped and adhered to the outer surface side of the second flap 32, but the present invention is not limited to this. A second flap 32 may be superimposed and adhered to the outer surface of the . As the adhesive, hot-melt adhesive, vinyl acetate resin adhesive, or the like can be used, and bonding is not limited to adhesion, but can be performed using double-sided tape or a stapler, for example.

Although corrugated paperboard is used as a material in this embodiment, paperboard such as cardboard may be used.

In the above-described embodiment, the inner flap 22 having both ends of the upper edge rounded off has been described as an example, but the present invention is not limited to this, and may have a general rectangular shape.

In the above-described embodiment, the inclined crease line 31a extending at an angle of 45° with respect to the first lower lateral crease line c2 has been described as an example, but the present invention is not limited to this. It suffices to extend obliquely from the portion toward the inner edge of the connecting plate 33 sandwiched between the slit 31d and the fitting edge 32a.

In addition, in the present embodiment, the inclined fold line 31a in which the connecting plate 33 is valley-folded in the inner surface direction of the trunk portion 10 has been described as an example, but the present invention is not limited to this, and the inclined fold line 31a is connected The plate 33 may be folded in a mountain so as to protrude below the trunk portion 10. - 特許庁

In the present embodiment, the adhesive region 31b has a substantially triangular shape, but the present invention is not limited to this. is not limited. Furthermore, the bonding region 31b may bond the entire region, or may bond only a part of the region. Furthermore, the bonding area can be extended to the outside (right side in FIG. 2) of the inclined crease line 31a that defines the bonding area 31b. In this case, it is necessary to provide the second flap 32, which is adhered to the widened area, with an inclined crease line along the inclined crease line 31a.

In addition, in the present embodiment, an example in which the notch 31c having a substantially triangular shape is formed in a part of the adhesion region 31b has been described, but the present invention is not limited to this, and the notch 31c has a rectangular shape. It may be fan-shaped, or it may not be formed.

In the above-described embodiment, the bending cut portion 31e extending rightward at an angle of 90° from the tip of the slit 31d has been described as an example, but the present invention is not limited to this. The angle does not need to be 90° as long as it is bent and extended from the tip, and the bent cut portion 31e can be omitted.

Furthermore, a second inclined fold line is formed diagonally downward to the right from the tip of the slit 31d (the tip of the bent cut portion 31e when the bent cut portion 31e is provided) to the tip edge of the first flap 31. good too. According to this, the slope can be formed with the second inclined crease line as the rotation axis.

In the above-described embodiment, an example in which the substantially triangular notch 31f is continuously provided at the proximal end of the slit 31d has been described, but the present invention is not limited to this, and the notch 31f may be rectangular or fan-shaped. or may be omitted.

In the above-described embodiment, the second flap 32 has a substantially inverted trapezoidal shape, but the right leg in FIG. good.

In the above-described embodiment, the fitting edge 32a is formed by cutting in an oblique straight line from the end of the base edge of the second flap 32 (the second lower lateral fold line d2) to the tip edge of the second flap 32. However, the present invention is not limited to this. The notch may be curved rather than linear, or may be vertically cut from an arbitrary point on the proximal edge of the second flap to the distal edge.

In the above-described embodiment, when the bottom plate portion 30 is assembled, the fitting projection portion 32b has entered the outer edge side of the bottom plate portion 30 from the tip of the slit 31d. However, the fitting protrusion 32b may not enter the outer edge side of the bottom plate portion 30 from the tip of the slit 31d, and the fitting protrusion 32b may be omitted.

In the above embodiment, the height of each first flap 31 is about half the width of the second side plate 12, but the present invention is made of paper and has some product errors. The half of the present invention is sufficient if the tip edges of the first flaps 31 can abut against each other when the bottom plate portion 30 is formed, and may be slightly longer than half.

Conversely, in the present invention, the height of each first flap 31 may be less than half the width of the second side plate 12 . According to this configuration, the area of the corrugated board 1A can be made smaller in the vertical direction.

In addition, in the present embodiment, the first flap 31 is formed with an inclined fold line 31a, an adhesive region 31b, a notch 31c, a slit 31d and a notch 31f, and the second flap 32 is substantially trapezoidal. 32 is formed with the fitting edge 32a and the fitting protrusion 32b, on the contrary, the first flap 31 is substantially trapezoidal, and the first flap is formed with the fitting edge 32a and the fitting protrusion 32b. Alternatively, the second flap 32 may be formed with an adhesive region 31b, a notch 31c, a slit 31d and a notch 31f.

1 ... packaging box (box)
DESCRIPTION OF SYMBOLS 10... Body part 11... First side plate 12... Second side plate 20... Top plate part 21... Outer flap 22... Inner flap 30... Bottom plate part 31... First flap 31a... Inclined fold line 31d... Slit 32... Second flap 32a ... Fitting edge 32b ... Fitting protrusion 33 ... Connection plate a1, a2, b ... Vertical crease line c2 ... First lower lateral crease line (first lateral crease line)
d2 ... Second lower horizontal folding line (second horizontal folding line)

Claims (3)

A one-touch bottom assembly type comprising a vertically extending square tube-shaped trunk and a bottom plate that closes the lower open end of the trunk when the trunk is deformed from a flat folded state to a square tubular state. In the box of
The body portion has a pair of first side plates facing each other and a pair of second side plates facing each other in a direction intersecting the facing direction of the pair of first side plates and having a width equal to or less than the first side plates, and a vertical crease line. formed by being connected via
the bottom plate portion includes a pair of first flaps connected to the lower edge of the first side plate via a first horizontal fold line and having a length from a base end to a tip end that is equal to or less than half the width of the second side plate; a pair of second flaps connected to the lower edge of the second side plate via a second horizontal fold line and having a length from the base end to the tip end that is equal to or less than the length from the base end to the tip end of the first flap; and in a state in which the first flap and the second flap are folded so as to sequentially overlap in the circumferential direction, one of the first flaps and one of the second flaps are adhered in the overlapped region Consists of a pair of connecting plates,
Each connecting plate has an inclined crease line extending obliquely from a corner of the bottom plate portion to an inner edge of each connecting plate in a region where the first flap and the second flap constituting each connecting plate overlap each other. is provided,
At the inner edge of one of the connecting plates, a slit is formed in one of two regions that overlap with the other connecting plate, and a fitting edge is formed in the other region,
An inner edge of the other connecting plate is formed with a fitting edge that fits into a slit formed in the inner edge of the one connecting plate when the body portion is deformed into a square tube shape in the one region. A slit is formed in the other region to be fitted into the fitting edge formed on the inner edge of the one connecting plate when the body is deformed into a square tube shape,
Each connecting plate has an inclined crease line extending from the intersection of the proximal edges of the first flap and the second flap constituting each connecting plate to the inner edge between the slit and the fitting edge. ,
A box body , wherein a curved cut portion extending in a direction away from the inclined crease line is provided at the tip of the slit . A one-touch bottom assembly type comprising a vertically extending square tube-shaped trunk and a bottom plate that closes the lower open end of the trunk when the trunk is deformed from a flat folded state to a square tubular state. In the box of
The body portion has a pair of first side plates facing each other and a pair of second side plates facing each other in a direction intersecting the facing direction of the pair of first side plates and having a width equal to or less than the first side plates, and a vertical crease line. formed by being connected via
the bottom plate portion includes a pair of first flaps connected to the lower edge of the first side plate via a first horizontal fold line and having a length from a base end to a tip end that is equal to or less than half the width of the second side plate; a pair of second flaps connected to the lower edge of the second side plate via a second horizontal fold line and having a length from the base end to the tip end that is equal to or less than the length from the base end to the tip end of the first flap; and in a state in which the first flap and the second flap are folded so as to sequentially overlap in the circumferential direction, one of the first flaps and one of the second flaps are adhered in the overlapped region Consists of a pair of connecting plates,
Each connecting plate has an inclined crease line extending obliquely from a corner of the bottom plate portion to an inner edge of each connecting plate in a region where the first flap and the second flap constituting each connecting plate overlap each other. is provided,
In each region where the two connecting plates overlap each other, a slit is provided in the leading end of one connecting plate in a direction away from the leading end edge, and a fitting edge that fits into the slit is provided in the side edge of the other connecting plate. ,
At the tip of the slit, a bent cut portion extending in a direction away from the inclined fold line is provided,
The inset edge is
When the body is in a state of being folded with respect to the vertical crease line that crosses the slit when the body is in the state of a rectangular tube and perpendicular to the overlapping region when the body is in the state of a square. formed by notching so that the side edge of the other connecting plate is spaced apart from the side edge of the one connecting plate,
When the trunk portion is transformed from the folded state to the rectangular tube state, the one connecting plate is inserted between the slits opened by pushing the side of the one connecting plate adjacent to the slit and closer to the fitting edge. A box characterized by: In the box according to claim 1 or 2,
The fitting rim is formed with a fitting projection that projects toward the tip of the slit from a position closer to the inner edge of the connecting plate than the position where the body intersects the slit when the body is in the rectangular tube state. A box characterized by:

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