Storage box

Abstract

To provide a storage box which allows a plurality of storage boxes to be stacked and locked together.SOLUTION: A storage box 1 has a trunk part 2. The trunk part 2 comprises a right face plate 3, a front face plate 4, a left face plate 5, a rear face plate 6, and a bottom 7. The face plates 3 to 6 comprise inner plates 3a to 6a and outer plates 3b to 6b which are overlapped with each other. Projections 23 to 26 formed at the lower end of the inner plates 3a to 6a are inserted into corner openings 27 formed at the four corners of the bottom 7, and protrude from the lower surface of the bottom 7. Each of the projections 23 to 26 inserted into the same type corner opening 27 constitutes a locking part 8. When a plurality of storage boxes 1 are vertically stacked, the locking parts 8 are locked to four corners on the upper end side of the trunk part 2 of another storage box 1 laid under the storage box.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a storage box made of cardboard. [Background technology]

[0002] Conventionally, plastic containers are known as bottomed rectangular tubular storage boxes for storing and transporting various parts in manufacturing plants, etc. This type of plastic container is provided with downwardly protruding locking portions at the four corners of the lower part so that the four corners of the upper and lower plastic containers do not shift when stacked one on top of the other, and these locking portions are locked to the upper end of the inner peripheral surface of the peripheral wall of the plastic container stacked below.

[0003] In response to this, a storage box capable of storing parts in the same manner as a container is known, as described in Patent Document 1. This storage box is formed by folding a corrugated cardboard sheet on which numerous creases and the like are formed along the creases.

[0004] In the storage box described in Patent Document 1, a rectangular cylindrical body is formed by four side panels that rise up from the periphery of a rectangular bottom panel, and each of these side panels consists of an outer panel and an inner panel, and the inner panel is engaged by inserting a locking tongue formed on the lower end of the inner panel into an opening formed in the bottom panel. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Utility Model Registration No. 3216071 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the storage box described in Patent Document 1 does not have a structure for locking the storage boxes together (so-called stacking) like plastic containers, so there is a possibility that the four corners of the storage boxes will become misaligned when stacked.

[0007] In view of the above, an object of the present invention is to provide a cardboard storage box that can be stacked and locked together. [Means for solving the problem]

[0008] The storage box of the present invention is a cardboard storage box having a rectangular tubular body extending in a vertical direction and a bottom closing a lower opening of the body, the body comprising a pair of first panel members facing each other in a first direction and a pair of second panel members facing each other in a second direction intersecting the first direction, the four corners of the bottom are each formed with a corner opening penetrating the bottom in the vertical direction, the first panel members comprise a first inner panel and a first outer panel which overlap in the first direction and are connected at their upper ends, and the second panel members comprise a second inner panel and a first outer panel which overlap in the second direction and are connected at their upper ends. The storage box has two outer panels, the first inner panel having a first protrusion formed on both ends of its lower end in the second direction, inserted into the corner opening and protruding from the underside of the bottom, and the second inner panel having a second protrusion formed on both ends of its lower end in the first direction, inserted into the corner opening and protruding from the underside of the bottom, and the first protrusion and the second protrusion inserted into the same corner opening constitute locking portions that lock into the four corners of the upper end side of the body of another storage box stacked below when a plurality of the storage boxes are stacked one above the other.

[0009] According to the present invention, a first protrusion and a second protrusion protrude downward from the corner opening at the four corners of the storage box. When a plurality of storage boxes are stacked one on top of the other, the protruding first protrusion and the second protrusion become locking parts that lock the four corners of the upper end side of the body of another storage box stacked below. Because the storage box of the present invention has these locking parts, it can be locked when cardboard storage boxes are stacked.

[0010] Furthermore, in the present invention, it is preferable that the second panel is provided with a connecting piece that connects the upper end of the second inner panel and the upper end of the second outer panel only at the middle portion in the first direction, the second inner panel is formed so that its length in the first direction is greater than the inner dimension of the storage box in the first direction, and has a pair of vertical fold lines extending in the up-down direction, the vertical fold lines being formed so as to connect the area of ​​the lower end of the second inner panel that is sandwiched between the two second protrusions from outside the area of ​​the upper end of the second inner panel that is connected to the connecting piece, and the second inner panel is folded at the vertical fold lines so that its side edges abut against the four corners of the body.

[0011] With this configuration, the side edges of the second inner panel abut against the four corners of the body, and the outer edges of the second protrusions on the extension lines of the side edges of the second inner panel can abut against the four corners of the upper end of the body of another storage box stacked below, allowing cardboard storage boxes to be more securely engaged when stacked.

[0012] In addition, in the storage box of the present invention, it is preferable that the first inner plate has a first protrusion crease line extending from the inner edge of the first protrusion to a side edge of the first inner plate adjacent to the first protrusion, and the second inner plate has a second protrusion crease line extending from the inner edge of the second protrusion to a side edge of the second inner plate adjacent to the second protrusion.

[0013] With this configuration, the lowest storage box can be simply placed on the ground, and the first and second protrusions can be folded horizontally along the first and second protrusion fold lines extending laterally, and stored inside the body.

[0014] Furthermore, in a storage box having a first protrusion crease line and a second protrusion crease line, it is preferable that the first protrusion crease line extends upward from a base end of the first protrusion portion on the side edge of the first inner plate, and the second protrusion crease line extends upward from a base end of the second protrusion portion on the side edge of the second inner plate.

[0015] With this configuration, the first and second protrusions are bent in a direction such that the outer edges move away from each other when folded, and can be folded without abutting each other. Therefore, the first and second protrusions support each other by abutting their outer edges against each other, and it is possible to prevent the first and second protrusions from becoming difficult to break.

[0016] In addition, in a storage box having a first protruding crease line and a second protruding crease line, it is preferable that the first inner plate has a sloping side edge in which the widthwise length of the first inner plate gradually decreases toward the tip of the first protruding portion.

[0017] With this configuration, the second protrusion portion can slide along the inclined side edge, wrap around the outer periphery of the first protrusion portion, and push the first protrusion portion from the outside to bend it, so that the folding order can be determined and the outer edges of the first protrusion portion and the second protrusion portion abut against each other to support each other, preventing them from becoming easily broken. [Brief description of the drawings]

[0018] [Figure 1] FIG. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. 4 is a perspective view showing the right panel, the front panel, the left panel, and the rear panel in a folded state. [Diagram 5] 13 is a plan view showing the right inner panel, the front inner panel, the left inner panel, and the rear inner panel folded. FIG. [Figure 6] FIG. [Figure 7] FIG. 13 is a perspective view showing a state in which two storage boxes are stacked one on top of the other. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] An embodiment of the present invention will be described with reference to the drawings.

[0020] As shown in FIG. 1, a storage box 1 of this embodiment is for storing products, is formed in a bottomed rectangular tubular shape, and can be stacked one on top of the other.

[0021] The storage box 1 has a rectangular cylindrical body 2, which has a right panel 3, a front panel 4, a left panel 5, a rear panel 6, and a bottom 7. These four panels 3 to 6 are all of the same height, rectangular, and integrally formed. Furthermore, the right panel 3 and the left panel 5 are formed as a pair with the same shape, and the front panel 4 and the rear panel 6 are formed as a pair with the same shape. As a result, the body 2 is configured in a hollow cylindrical shape. In the figure, the left-right direction corresponds to the "first direction" of the present invention, the front-rear direction corresponds to the "second direction" of the present invention, the right panel 3 and the left panel 5 correspond to the "first panel" of the present invention, and the front panel 4 and the rear panel 6 correspond to the "second panel" of the present invention.

[0022] The right panel 3 includes a right inner panel 3a and a right outer panel 3b that overlap each other in the left-right direction, and the front panel 4 includes a front inner panel 4a and a front outer panel 4b that overlap each other in the front-rear direction. Similarly, the left panel 5 includes a left inner panel 5a and a left outer panel 5b that overlap each other in the left-right direction, and the rear panel 6 includes a rear inner panel 6a and a rear outer panel 6b that overlap each other in the front-rear direction. The right inner plate 3a and the left inner plate 5a correspond to the "first inner plate" of the present invention, the right outer plate 3b and the left outer plate 5b correspond to the "first outer plate" of the present invention, the front inner plate 4a and the rear inner plate 6a correspond to the "second inner plate" of the present invention, and the front outer plate 4b and the rear outer plate 6b correspond to the "second outer plate" of the present invention.

[0023] As shown in FIG. 2, the storage box 1 is assembled from a corrugated cardboard 10 that has been punched into a roughly rectangular shape.

[0024] As shown expanded in Figure 2, the corrugated cardboard 10 has a right outer panel 3b, a front outer panel 4b, a left outer panel 5b and a rear outer panel 6b connected in the left-right direction, and the right inner panel 3a, the front inner panel 4a, the left inner panel 5a and the rear inner panel 6a are connected to the upper edges of the right outer panel 3b, the front outer panel 4b, the left outer panel 5b and the rear outer panel 6b via a right connecting piece 13, a front connecting piece 14, a left connecting piece 15 and a rear connecting piece 16, and the first to fourth bottom flaps 7a to 7d are connected to the lower edges of each.

[0025] First, the right skin 3b, the front skin 4b, the left skin 5b and the rear skin 6b will be described. The right skin 3b, the front skin 4b, the left skin 5b, and the rear skin 6b are all rectangular. The right skin 3b, the front skin 4b, the left skin 5b, and the rear skin 6b are connected to their right side edges in this order via fold lines L1 to L3. Furthermore, an adhesive strip 11 is connected to the left end edge of the right skin 3b via a fold line L4.

[0026] Next, the right connecting piece 13, the front connecting piece 14, the left connecting piece 15 and the rear connecting piece 16 will be described. The right connecting piece 13, the front connecting piece 14, the left connecting piece 15 and the rear connecting piece 16 are all generally trapezoidal in shape.

[0027] A right connecting piece 13 is connected to the upper edge of the right outer panel 3b via fold line L5, a front connecting piece 14 is connected to the upper edge of the front outer panel 4b via fold line L6, a left connecting piece 15 is connected to the upper edge of the left outer panel 5b via fold line L7, and a rear connecting piece 16 is connected to the upper edge of the rear outer panel 6b via fold line L8.

[0028] The right inner plate 3a is connected to the upper edge of the right connecting piece 13 via a fold line L9, the front inner plate 4a is connected to the upper edge of the front connecting piece 14 via a fold line L10, the left inner plate 5a is connected to the upper edge of the left connecting piece 15 via a fold line L11, and the rear inner plate 6a is connected to the upper edge of the rear connecting piece 16 via a fold line L12. The front connecting piece 14 and the rear connecting piece 16 correspond to the "connecting pieces" of the present invention.

[0029] Notches 13a to 16a are formed at both left and right ends of each of the connection pieces 13 to 16. As a result, each of the connection pieces 13 to 16 connects the horizontal center (left and right direction in FIG. 2) of each of the outer plates 3b to 6b to the horizontal center (left and right direction in FIG. 2) of each of the inner plates 3a to 6a. The notches 13a to 16a are formed by cutting out not only each of the connection pieces 13 to 16 but also a part of the lower end side of each of the inner plates 3a to 6a in a horizontally elongated rectangular shape.

[0030] Furthermore, the right connecting piece 13 and the left connecting piece 15 have inverted trapezoidal openings 13b, 15b formed in the center in the horizontal direction (left-right direction in FIG. 2), and each is divided into two. The openings 13b, 15b are formed by cutting out not only the right connecting piece 13 and the left connecting piece 15, but also a part of the lower end side of the right inner plate 3a and the left inner plate 5a in a horizontally elongated rectangular shape. The length of the openings 13b, 15b is approximately twice the length of the cutouts 13a, 15a.

[0031] Next, the right inner plate 3a, the front inner plate 4a, the left inner plate 5a and the rear inner plate 6a will be described. The right inner plate 3a, the front inner plate 4a, the left inner plate 5a and the rear inner plate 6a are all generally concave in shape. The length (width) in the left-right direction of the front inner plate 4a and the rear inner plate 6a is greater than the distance between the right outer plate 3b and the left outer plate 5b when assembled into a box shape.

[0032] Right protrusions 23 protruding upward are formed on the left and right ends of the upper end of the right inner plate 3a. Furthermore, front protrusions 24 protruding upward are formed on the left and right ends of the upper end of the front inner plate 4a. Furthermore, left protrusions 25 protruding upward are formed on the left and right ends of the upper end of the left inner plate 5a. Furthermore, rear protrusions 26 protruding upward are formed on the left and right ends of the upper end of the rear inner plate 6a.

[0033] The right protrusion 23 and the left protrusion 25 correspond to a "first protrusion" of the present invention, and the front protrusion 24 and the rear protrusion 26 correspond to a "second protrusion" of the present invention.

[0034] The right inner plate 3a, the front inner plate 4a, the left inner plate 5a and the rear inner plate 6a are each formed with two protrusion crease lines 33-36 for bending each of the protrusions 23-26 on the base end side of each of the protrusions 23-26. The protrusion crease lines 33, 35 correspond to the "first protrusion crease line" of the present invention, and the protrusion crease lines 34, 36 correspond to the "second protrusion crease line" of the present invention.

[0035] Each protrusion fold line 33-36 is formed so as to slope downward from the inner edge of each protrusion 23-26 toward the adjacent side edge of each inner plate 3a-6a, and the vertical positions of their tips (the intersections of each fold line 33-36 with the side edges of each inner plate 3a-6a) are all generally consistent.

[0036] Additionally, rectangular notches 53 to 56 are formed on the upper edges of the right inner plate 3a, the front inner plate 4a, the left inner plate 5a, and the rear inner plate 6a. Of these, two notches 53 and two notches 55 are formed. These are recesses into which an insertion piece 70a of a cardboard bottom plate 70, which will be described later, is fitted.

[0037] The outer edges of the right protrusion 23 and the left protrusion 25 are cut out so that the tips of the right inner plate 3a and the left inner plate 5a taper upward, thereby forming inclined side edges 23a, 25a.

[0038] The front protrusion 24 and the rear protrusion 26 protrude slightly higher than the right protrusion 23 and the left protrusion 25. Furthermore, the front inner plate 4a and the rear inner plate 6a have vertical fold lines 44, 46 that extend in the up-down direction from the inside of the base ends of the front protrusion 24 and the rear protrusion 26 to the notches 14a, 16a. Furthermore, the front inner plate 4a and the rear inner plate 6a have handle openings 4a1, 6a1, and the front outer plate 4b and the rear outer plate 6b have handle openings 4b1, 6b1 that are paired with the front connecting piece 14 and the rear connecting piece 16, respectively.

[0039] The bottom 7 is an assembly type known as an American lock or inferno bottom, and is composed of four right bottom flaps 7a, a front bottom flap 7b, a left bottom flap 7c, and a rear bottom flap 7d, and closes the lower opening of the torso 2. Furthermore, in this embodiment, a bottom plate 70 is laid on top of each of the bottom flaps 7a to 7d for reinforcement.

[0040] The right bottom flap 7a is connected to the lower edge of the right outer panel 3b via a fold line L13. The right bottom flap 7a is generally trapezoidal in shape, and bottom notches 17a are formed on both left and right ends of the upper end portion.

[0041] The front bottom flap 7b is connected to the lower edge of the front outer panel 4b via a fold line L14. Front bottom flap 7b is generally L-shaped with bottom notch 17b1 formed at the left end of the upper end and bottom notch 17b2 formed at the right end of the upper end.

[0042] The left bottom flap 7c is connected to the lower edge of the left outer panel 5b via a fold line L15. The left bottom flap 7c has a generally inverted concave shape, and bottom notches 17c are formed on both left and right ends of the upper end portion.

[0043] The rear bottom flap 7d is connected to the lower edge of the rear outer panel 6b via a fold line L16. Rear bottom flap 7d is generally L-shaped, with a bottom notch 17d1 formed at the right end of the upper end and a bottom notch 17d2 formed at the left end of the upper end.

[0044] In the present embodiment, the bottom 7 has a bottom plate 70, as shown in FIG. 3, laid on each of the bottom flaps 7a to 7d for reinforcement.

[0045] The bottom plate 70 is formed in a rectangular shape, and each side edge is provided with one insertion piece 70a at the top and bottom and two at the left and right, which protrude outward.

[0046] Next, the procedure for assembling the container 1 will be described. First, the front outer panel 4b is folded along the fold line L1, and the adhesive strip 11 is folded along the fold line L2. Then, the left outer panel 5b is folded along the fold line L3, and the rear outer panel 6b is folded along the fold line L4, and the adhesive strip 11 is adhered to the inner surface of the rear outer panel 6b with an adhesive (not shown). As a result, the storage box 1 is formed into a rectangular tube shape.

[0047] Next, the left bottom flap 7c, the front bottom flap 7b, the rear bottom flap 7d, and the right bottom flap 7a are folded in this order and overlapped, and the protruding part at the tip (the lower end in FIG. 2) of the right bottom flap 7a is inserted into the recessed part at the tip side (the lower end in FIG. 2) of the left bottom flap 7c by pushing it toward the internal space of the box. This forms the bottom 7, resulting in the state shown in FIG.

[0048] Here, the bottom notches 17a to 17d2 when the bottom 7 is formed will be described. Bottom notch 17a of the right bottom flap 7a, bottom notch 17b1 of the front bottom flap 7b, and bottom notch 17d1 of the rear bottom flap 7d are formed so that their cut-out spaces coincide when in a horizontal position, and bottom notch 17c of the left bottom flap 7c, bottom notch 17b2 of the front bottom flap 7b, and bottom notch 17d2 of the rear bottom flap 7d are formed so that their cut-out areas coincide when in a horizontal position, so that each pair forms corner openings 27 at the four corners of the bottom 7.

[0049] Next, the front connecting piece 14 is folded horizontally along the fold line L6, and the front inner plate 4a is folded downward along the fold line L10. Similarly, the rear connecting piece 16 is folded horizontally along the fold line L8, and the rear inner plate 6a is folded downward along the fold line L12.

[0050] As a result, the front protrusion 24 and the rear protrusion 26 are inserted into the opposing corner openings 27, respectively, and protrude from the lower surface of the bottom portion 7 (see FIGS. 1 and 6).

[0051] Incidentally, since the length (width) in the left-right direction of the front inner plate 4a and the rear inner plate 6a is greater than the distance between the right outer plate 3b and the left outer plate 5b when assembled into a box shape, when bending them downward, they are inserted between the right outer plate 3b and the left outer plate 5b while being slightly folded into the shape of the bottom of the ship along the vertical fold lines 44, 46, respectively.

[0052] As a result, the side edges of the front inner plate 4a and the rear inner plate 6a are pressed against the inner surfaces of the right outer plate 3b and the left outer plate 5b by the restoring forces of the vertical fold lines 44, 46, so that simply by folding the front inner plate 4a and the rear inner plate 6a so as to overlap the front outer plate 4b and the rear outer plate 6b, the side edges of the front inner plate 4a and the rear inner plate 6a are reliably positioned at the four corners of the body 2. In other words, the front inner plate 4a and the front outer plate 4b (the rear inner plate 6a and the rear outer plate 6b) are configured to have an inverted trapezoidal shape as a whole.

[0053] As a result, the outer edges of the front protrusions 24 and rear protrusions 26 extending from the respective side edges of the front inner plate 4a and the rear inner plate 6a also extend from the four corners of the body portion 2 in a substantially downward direction.

[0054] Next, the right connecting piece 13 is folded horizontally along the fold line L5, and the right inner plate 3a is folded downward along the fold line L9. Similarly, the left connecting piece 15 is folded horizontally along the fold line L7, and the left inner plate 5a is folded downward along the fold line L11. At this time, the side edges of the right inner plate 3a and the left inner plate 5a abut against the surfaces of the already folded front inner plate 4a and rear inner plate 6a (the surfaces on the internal space side in the areas outside the vertical fold lines 44, 46 in the left-right direction).

[0055] As a result, the right protrusion 23 and the left protrusion 25 are inserted into the opposing corner openings 27, respectively, and protrude from the lower surface of the bottom portion 7 (see FIGS. 1 and 6).

[0056] As shown in FIG. 6, the front protrusion 24 and the right protrusion 23 are inserted into the corner opening 27 formed in the front right corner of the bottom 7 and protrude from the underside of the bottom 7 to form an engagement portion 8 that is roughly shaped like the letter "I."

[0057] Similarly, a set of engagement portions 8 consisting of a front protrusion 24 and a left protrusion 25 is formed at the front left corner, a set of a rear protrusion 26 and a right protrusion 23 is formed at the rear right corner, and a set of a rear protrusion 26 and a left protrusion 25 is formed at the rear left corner.

[0058] As described above, the notches 13a-16a are formed in a horizontally elongated rectangular shape by cutting out not only each connecting piece 13-16 but also a portion of the lower end side of each inner plate 3a-6a. Therefore, when each inner plate 3a-6a is folded inwardly of each outer plate 3b-6b via each connecting piece 13-16, the inner plate 3a-6a side is one step lower at each of the four corners of the body 2, and four step portions 9 are formed (see Figures 1 and 7).

[0059] Similarly, the openings 13b, 15b are cut out in a horizontally elongated rectangular shape not only through the right connecting piece 13 and the left connecting piece 15, but also through a portion of the lower end side of the right inner panel 3a and the left inner panel 5a. Therefore, when the right inner panel 3a and the left inner panel 5a are folded inwardly of the right outer panel 3b and the left outer panel 5b via the connecting pieces 13, 15, the right inner panel 3a and the left inner panel 5a side become one step lower in the central portion of the right panel 3 and the left panel 5, and two auxiliary step portions 9a are formed (see Figure 1).

[0060] Finally, the bottom plate 70 is inserted into the body 2 and the insertion pieces 70a are fitted into the notches 53-56 formed in each of the inner plates 3a-6a, whereby the bottom plate 70 connects and engages the bottom 7 and the body 2.

[0061] As described above, the storage box 1 shown in FIG.

[0062] Next, the effects of the container 1 according to this embodiment will be described. The storage box 1 is constructed such that the right panel 3, front panel 4, left panel 5 and rear panel 6 are formed by overlapping the inner panels 3a-6a and the outer panels 3b-6b, and the bottom 7 is formed by overlapping the flaps 7a-7d and the bottom panel 70, so that it has high strength and can be used in place of or together with a plastic container.

[0063] In particular, in the storage box 1, the side edges of the front inner plate 4a and the rear inner plate 6a abut against the four corners of the body 2, further increasing the strength of the box.

[0064] In addition, the bottom 7 of the storage box 1 is of a prefabricated type known as an American lock or bottom lock, so as long as products are stored inside and the convex portion of the right bottom flap 7a is pressed against the other bottom flaps 7b to 7d, the bottom is unlikely to fall out.

[0065] Furthermore, the bottom 7 and the body 2 are connected by fitting the insertion piece 70a of the bottom plate 70 into the notches 53-56 formed in each of the inner plates 3a-6a, thereby further increasing the strength of the box.

[0066] In the storage box 1 of this embodiment, locking portions 8 are formed on the lower end side and step portions 9 are formed on the upper end side of the four corners of the body 2, so that when multiple storage boxes 1 are stacked one on top of the other, the locking portions 8 of the upper storage box 1 can be fitted into the step portions 9 of the lower storage box 1 and abut against the outer plates 3b to 6b of the lower storage box 1. This allows the upper storage box 1 to be locked to the lower storage box 1, making it possible to prevent the stacked storage boxes 1 from rattling in the front-to-back and left-to-right directions.

[0067] In particular, in the storage box 1 of this embodiment, the side edges of the front inner plate 4a and the rear inner plate 6a abut against the four corners of the body 2, and therefore the outer edges of the front protrusion 24 and the rear protrusion 26 extending from the side edges of the front inner plate 4a and the rear inner plate 6a also extend directly downward from the four corners of the body 2.

[0068] Therefore, in the storage box 1, the outer edges of the front protrusion 24 and the rear protrusion 26 of each locking portion 8 of the upper storage box 1 can be abutted against the corners (fold lines L1 to L4) of each outer panel 3b to 6b of the lower storage box 1, thereby further preventing multiple stacked storage boxes 1 from wobbling in the front-to-back and side-to-side directions.

[0069] In particular, the uneven features of this storage box 1 are common to the above-mentioned plastic container, so that it is possible to use the storage box 1 alone, and also to use the storage box 1 and the plastic container at the same time.

[0070] Furthermore, since the storage boxes 1 of this embodiment have the auxiliary step portion 9a, even when the first tier of storage boxes 1 are aligned vertically and the second tier of storage boxes 1 are aligned horizontally, so as to be stacked in an alternating row, the outer edges of the front protrusions 24 and rear protrusions 26 can be stored in the step portion 9 and the auxiliary step portion 9a, thereby preventing the stacked storage boxes 1 from wobbling in the front-back and left-right directions. Also, since the storage boxes 1 of this embodiment have the auxiliary step portion 9a, two storage boxes with half the area of ​​the bottom (the lengths of the right and left panel are equal to the lengths of the front panel 4 and rear panel 6, and the lengths of the front and rear panels are half the lengths of the right and left panels) can be stacked side by side on top of each other.

[0071] Furthermore, in the storage box 1 of this embodiment, two protrusion fold lines 33-36 for folding each of the protrusions 23-26 are formed on the base end side of each of the protrusions 23-26, so that when multiple storage boxes 1 are stacked, the locking portion 8 of the bottom storage box 1 can be temporarily folded upward.

[0072] Therefore, the entire lower surface of the bottom 7 can be placed on the floor, which prevents the boxes from becoming unstable when stacked. At the same time, the folding positions are determined in a deliberate manner, which prevents the load on the locking portion 8 from being mistakenly transferred to the inner plates 3a to 6a, causing the inner plates 3a to 6a to shift upward and the boxes from accidentally unfolding.

[0073] Also, as shown in FIG. 6, in the storage box 1 of this embodiment, the front protrusion 24 and the rear protrusion 26 are slightly longer than the right protrusion 23 and the left protrusion 25, so that the front protrusion 24 and the rear protrusion 26 start to bend before the right protrusion 23 and the left protrusion 25.

[0074] Therefore, in the storage box 1 of this embodiment, since the bending order is fixed, it is possible to avoid a situation in which one protrusion and the other protrusion try to bend at the same time, collide with each other, and support each other, making it difficult to bend.

[0075] In particular, in the storage box 1 of this embodiment, the shorter right protrusion portion 23 and left protrusion portion 25 are formed with inclined side edges 23a, 25a, thereby preventing the right protrusion portion 23 and the left protrusion portion 25 from becoming an obstacle when the front protrusion portion 24 and the rear protrusion portion 26 begin to bend.

[0076] In addition, in the storage box 1 of this embodiment, the protruding crease lines 33-36 are formed so as to incline downwards toward the side edges of the inner plates 3a-6a. This is to avoid a situation in which, if the protruding crease lines 33-36 were all formed in the horizontal direction (the left-right direction in FIG. 2), one protruding part (for example, the front protruding part 24) would bend in the direction in which the other protruding part (for example, the right protruding part 23) would cross the other protruding part (for example, the right protruding part 23) and collide with each other while trying to bend at the same time (unless some measure such as the inclined side edges 23a, 25a is formed), and they would support each other and become difficult to bend.

[0077] That is, in the storage box 1, the protrusion fold lines 33-36 are formed at an incline, so that the protrusions 23-26 are folded while being rotated slightly toward the center of the bottom 7. This makes it possible to prevent a situation in which parts constituting the same locking part 8 (for example, the outer edge of the front protrusion 24 and the outer edge of the right protrusion 23) support each other, making it difficult to bend.

[0078] Furthermore, in the storage box 1 of this embodiment, the vertical positions of the tips of the protrusion crease lines 33-36 (the intersections of each crease line 33-36 with the side edges of each inner panel 3a-6a) are generally all consistent, so that, for example, in the case of the front left locking portion 8, the front protrusion 24, which begins to bend first while rotating, can push in the right protrusion 23 located on the inside and bend them together at the right protrusion crease line 33.

[0079] Furthermore, when the bottommost storage box 1 is reloaded, the elastic restoration of the protrusion fold lines 33-36 causes each of the protrusions 23-26 to protrude downward again, and thus they can abut against the step portion 9 of the lower storage box 1 again.

[0080] Finally, a modification of the container 1 will be described. In this embodiment, the storage box 1 is described with a view to being used in common with a plastic container, but the present invention is not limited to this, and the storage box 1 may be used alone.

[0081] In this embodiment, the inner plates 3a to 6a and the outer plates 3b to 6b are connected via the connecting pieces 13 to 16, but the present invention is not limited to this, and the inner plates 3a to 6a and the outer plates 3b to 6b may be directly connected. Also, in this embodiment, the connecting pieces 13 to 16 are generally trapezoidal, but the present invention is not limited to this, and the connecting pieces 13 to 16 may be rectangular or elliptical.

[0082] In this embodiment, taking the front panel 4 as an example, the left-right length (width) of the front inner panel 4a is made larger than the distance between the right outer panel 3b and the left outer panel 5b when assembled into a box shape, notches 14a are formed at the left and right ends of the front connecting piece 14, and further, a vertical fold line 44 extending perpendicularly to the front inner panel 4a is formed, thereby configuring the front inner panel 4a to have a ship's bottom shape.

[0083] However, the vertical fold lines 44 may be omitted, and the front inner plate 4a may be bow-shaped. Furthermore, since the present invention is not limited to the arrangement of the side edges of the front inner plate 4a and the rear inner plate 6a at the four corners of the body 2, in the case of the front plate 4 as an example, the length (width) in the left-right direction of the front inner plate 4a may be equal to or smaller than the inner dimension of the box shape, and the notch 14a may be omitted.

[0084] In this embodiment, the cutouts 13a to 16a are cut out to the lower end portions (see FIG. 2) of the inner plates 3a to 6a to form the stepped portions 9 resembling those of a plastic container, but the stepped portions 9 can be omitted, so the lower end portions of the inner plates 3a to 6a do not have to be cut out. In this case, the locking portions 8 can be locked to the surfaces of the inner plates 3a to 6a on the inner space side.

[0085] In this embodiment, an example has been described in which two protrusion creases 33-36 for bending each of the protrusions 23-26 are formed on the base end side of each of the protrusions 23-26, but the present invention is not limited to this, and the protrusion creases 33-36 can be omitted.

[0086] In this embodiment, the projection fold lines 33-36 are formed so as to slope downward from the inner edge of each projection 23-26 toward the adjacent side edge of each inner plate 3a-6a, but the present invention is not limited to this, and there is no limit to the angle at which each projection 23-26 extends as long as it can be folded toward the bottom 7. However, it is easier to accommodate each projection 23-26 in the corner opening 27 if the slope slopes downward from the horizontal direction.

[0087] In this embodiment, the protrusion crease lines 33-36 are generally aligned in the up-down direction at the tips of the protrusions 23-26 (intersections of the crease lines 33-36 and the side edges of the inner panels 3a-6a), but the present invention is not limited to this. For example, in the case of the front right locking portion 8, the tip of the front protrusion crease line 34 of the front protrusion 24 and the tip of the right protrusion crease line 33 of the right protrusion 23 may be located above or below each other. However, if the tip of the protrusion crease line on the side that is folded inward (upper) (in this example, the right protrusion 23) is located below, the protrusion on the inner side (in this example, the front protrusion 24) can be simultaneously pressed and folded when folding the protrusion on the outer side (in this example, the front protrusion 24).

[0088] In this embodiment, an example has been described in which inclined side edges 23a, 25a are formed on the outer edges of the right protrusion portion 23 and the left protrusion portion 25, but the present invention is not limited to this, and the outer edges of the right protrusion portion 23 and the left protrusion portion 25 may be cut out toward the center in the left-right direction, or conversely, they may not be cut out at all.

[0089] In this embodiment, the front protrusion 24 and the rear protrusion 26 are described as protruding slightly higher than the right protrusion 23 and the left protrusion 25, but the present invention is not limited to this, and there is no restriction on the up-down relationship, and they may be at the same height.

[0090] In this embodiment, a bottom panel 70 is used, but the bottom panel 70 does not have to be used. Instead, a plate portion for forming the bottom panel may be connected to the upper edges of the right inner panel 3a and the left inner panel 5a in Figure 2, and these may be butted together.

[0091] In this embodiment, the bottom 7 has been described as an example of a prefabricated type known as an American lock or hell bottom, but the present invention is not limited to this, and as long as a bottom notch is formed to create the corner opening 27, there is no limitation on the configuration of the bottom 7, and it may be a rectangular inner and outer flap that makes up a so-called mandarin orange box. [Explanation of symbols]

[0092] 1 Storage box 2. Torso 3 Right side plate (first side plate) 3a Right inner plate (1st inner plate) 3b Right outer panel (1st outer panel) 5 Left side plate (first side plate) 5a Left inner plate (1st inner plate) 5b Left skin (first skin) 4 Front plate (second face plate) 4a Anterior inner plate (second inner plate) 4b Front outer panel (second outer panel) 6 Rear plate (second plate) 6a Posterior medial plate (second medial plate) 6b Rear skin (second skin) 7 Bottom 8 Locking part 14 Front connection piece (connection piece) 16 Rear connection piece (connection piece) 23 Right protrusion (1st protrusion) 24 Front projection (second projection) 25 Left protrusion (1st protrusion) 26 Rear protrusion (second protrusion) 23a Slanted side edge 25a Slanted side edge 27 Corner opening 33 Right protrusion crease line (first protrusion crease line) 34 Front protrusion crease line (second protrusion crease line) 35 Left protrusion crease line (1st protrusion crease line) 36 Posterior protrusion crease line (second protrusion crease line) 44 Vertical fold line 46 Vertical fold line

Claims

1. A cardboard storage box having a rectangular tubular body extending in the vertical direction and a bottom that closes a lower opening of the body, The body portion includes a pair of first panels facing each other in a first direction and a pair of second panels facing each other in a second direction intersecting the first direction, At each of the four corners of the bottom portion, a corner opening is formed which penetrates the bottom portion in the up-down direction, The first panel includes a first inner panel and a first outer panel that overlap in the first direction and are connected at upper ends, The second panel includes a second inner panel and a second outer panel that overlap in the second direction and are connected at upper ends, the first inner plate has a first protrusion formed on both end sides of a lower end thereof in the second direction, the first protrusion being inserted into the corner opening and protruding from a lower surface of the bottom portion, the second inner plate has second protrusions formed on both end sides of a lower end thereof in the first direction, the second protrusions being inserted into the corner openings and protruding from a lower surface of the bottom portion, the first protrusion and the second protrusion inserted into the same corner opening constitute locking portions that are locked to the four corners of the upper end side of the body portion of another storage box stacked below when a plurality of the storage boxes are stacked vertically, the second panel includes a connection piece that connects an upper end of the second inner panel and an upper end of the second outer panel only at a middle portion in the first direction, The second inner plate has a length in the first direction greater than an inner dimension of the container in the first direction, and has a pair of vertical fold lines extending in the up-down direction, the vertical fold line is formed so as to connect an area of ​​the upper end of the second inner plate that is connected to the connecting piece to an area of ​​the lower end of the second inner plate that is sandwiched between both second protrusions, The second inner panel is folded along the vertical crease lines and has side edges abutted against the four corners of the body portion.

2. A cardboard storage box having a rectangular tubular body extending in the vertical direction and a bottom that closes a lower opening of the body, The body portion includes a pair of first panels facing each other in a first direction and a pair of second panels facing each other in a second direction intersecting the first direction, At each of the four corners of the bottom portion, a corner opening is formed which penetrates the bottom portion in the up-down direction, The first panel includes a first inner panel and a first outer panel that overlap in the first direction and are connected at upper ends, The second panel includes a second inner panel and a second outer panel that overlap in the second direction and are connected at upper ends, the first inner plate has a first protrusion formed on each of both ends of a lower end thereof in the second direction, the first protrusion being inserted into the corner opening and protruding from a lower surface of the bottom portion, the second inner plate has second protrusions formed on both end sides of a lower end thereof in the first direction, the second protrusions being inserted into the corner openings and protruding from a lower surface of the bottom portion, the first protrusion and the second protrusion inserted into the same corner opening constitute locking portions that are locked to the four corners of the upper end side of the body portion of another storage box stacked below when a plurality of the storage boxes are stacked vertically, the first inner panel has a first projection crease line extending from an inner edge of the first projection to a side edge of the first inner panel adjacent the first projection; The second inner panel has a second protrusion crease line extending from an inner edge of the second protrusion to a side edge of the second inner panel adjacent the second protrusion.

3. The storage box according to claim 2, The first protrusion crease line extends upward from a base end of the first protrusion portion on a side edge of the first inner plate, A storage box, characterized in that the second protrusion fold line extends upward from a base end of the second protrusion portion on a side edge of the second inner plate.

4. The storage box according to claim 3, The storage box according to claim 1, wherein the first inner plate has an inclined side edge whose widthwise length gradually decreases toward the tip of the first protrusion.

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