Packaging boxes

Abstract

The present invention provides a packaging box that can be easily assembled, and furthermore, a packaging box that can be stored in an assembled state. [Solution] The packaging box comprises a bottom plate 21, a pair of first side plates 22 that stand upright relative to the bottom plate 21, and a pair of second side plates 23 adjacent to the bottom plate 21 that stand upright relative to the bottom plate 21, with an opening formed at least at the top, and a flexible top plate 32 and a handle plate 34 continuously provided at the upper end of the first side plates 22 via a bendable portion, the handle plate 34 having a handle projection 36, and a first auxiliary plate 28 that overlaps the second side plate 23 at the side end of the first side plate 22 adjacent to the second side plate 23, the upper end of which has a flexible holding portion 29 via a bendable portion, and this holding portion 29 has a locking portion 30, and the handle projection 36 is inserted into this locking portion 30 to fix the handle plate 34.

Description

Technical Field

[0001] The present invention relates to a packaging box that is easy to assemble.

Background Art

[0002] Conventionally, for example, a packaging box that uses a sheet material such as paper folded and assembled for accommodating articles such as cakes, includes a bottom plate, a pair of first side plates and second side plates standing with respect to the bottom plate, and an auxiliary plate that is continuously provided on the first side plate and is disposed inside the second side plate and stands with respect to the bottom plate, and an opening is formed at the upper part (see Patent Document 1). In this packaging box, the second side plate and the auxiliary plate are adhered and fixed at a side plate fixing portion to hold the side plates standing. In such a packaging box, since adjacent side plates are adhered and fixed to each other with an adhesive by the auxiliary plate, the packaging box can be easily assembled by raising the side plates from the folded semi-finished state, but there is a problem that a process of adhesion processing is required and the cost becomes high.

[0003]

Prior Art Documents

Patent Documents

Patent Documents

[0004]

Disclosure of the Invention

Problems to be Solved by the Invention

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a packaging box that can be easily assembled without adhesion processing using an adhesive. Furthermore, an object is to provide a packaging box that can be stocked in an assembled state.

[0006]

Means for Solving the Problems

[0007] The problems that this invention aims to solve are as described above, and the means for solving these problems will now be explained.

[0008] The first invention comprises a base plate, a pair of first side plates standing upright relative to the base plate, and a pair of second side plates adjacent to the first side plates and standing upright relative to the base plate, with an opening formed at least at the top, and the upper end of the first side plates is continuously provided with a top plate that can be bent via a bendable portion to close the opening and a handle plate standing upright from the top plate, the handle plate having a handle projection on the second side plate side, and the side end of the first side plate adjacent to the second side plate having a first auxiliary plate that overlaps the second side plate via a bendable portion, the upper end of the first auxiliary plate having a bendable holding portion via a bendable portion, the holding portion having a locking portion, and the handle plate is fixed by inserting the handle projection into the locking portion.

[0009] The second invention is the same as the first invention, characterized in that a first locking piece is provided on either the second side plate or the first auxiliary plate, and this first locking piece is locked to the other to maintain the upright position of the first side plate.

[0010] The third invention is the first or second invention, characterized in that the second side plate has a second auxiliary plate that overlaps the inside of the first side plate via a bent portion at the side end adjacent to the first side plate, and either the first side plate or the second auxiliary plate has a second locking piece, and the first side plate is held upright by locking this second locking piece to the other.

[0011] The fourth invention is the second invention, characterized in that the first locking piece is formed by cutting into the first auxiliary plate, and its angle with respect to the first auxiliary plate changes in conjunction with the bending operation of the bent portion between the first auxiliary plate and the holding portion.

[0012] In the fifth invention, the second locking piece is formed by cutting into the first side plate, and its angle with respect to the first side plate changes in conjunction with the bending movement of the bent portion between the first side plate and the top plate. [Effects of the Invention]

[0013] According to the present invention, the packaging box can be easily assembled without performing an attachment process using an adhesive or the like. Furthermore, it is possible to store the packaging box in an assembled state.

Brief Description of the Drawings

[0014] [Figure 1] A plan view of the unfolded sheet 11 of the packaging box 1. [Figure 2] The packaging box 1 in a completed assembled state. [Figure 3] A simplified perspective view of the packaging box 1 during the first assembly process. [Figure 4] A partially enlarged view of the packaging box 1 during the first assembly process. [Figure 5] A simplified perspective view of the packaging box 1 during the second assembly process. [Figure 6] A partially enlarged view of the packaging box 1 during the second assembly process. [Figure 7] A plan view of the unfolded sheet 12 of the packaging box 2. [Figure 8] A partially enlarged view of the packaging box 2 during the assembly process. [Figure 9] A partially enlarged view of the packaging box 2 during the assembly process.

Mode for Carrying Out the Invention

[0015] The packaging box 1 shown in FIG. 2 according to the present embodiment is a packaging box used when taking out an article such as a cake, and is a packaging box having a handle on the upper part of a box body that houses the article.

[0016] The packaging box 1 is formed by assembling the unfolded sheet 11 shown in FIG. 1. The packaging box 1 in the present embodiment is formed of cardboard, but may be formed of a plate-like member such as corrugated cardboard.

[0017] First, the configuration of the unfolded sheet 11 will be described according to FIG. 1. FIG. 1 shows the inner surface of the packaging box 1 with the front side of the paper surface as the front side. In this embodiment, the bent portion refers to a linear portion provided for bending the sheet material. Examples of the formation of the bent portion include those formed by a score line, a cut line, a sewing line, etc., and are illustrated by a broken line.

[0018] The bottom plate 21 is a part that constitutes the bottom of the box body and is formed in a rectangular shape. Note that although the planar shape of the packaging box 1 in this embodiment is rectangular, it may be changed to other shapes such as a square. A pair of first side plates 22·22 that constitute the front and rear side plates of the box body are continuously provided at the front and rear edge portions of the bottom plate 21 via bent portions, respectively. A pair of second side plates 23·23 that constitute the left and right side plates of the box body are continuously provided at the left and right edge portions of the bottom plate 21 via bent portions, respectively.

[0019] At the left and right edge portions of the rear first side plate 22, first auxiliary plates 28·28 are continuously provided via bent portions, respectively. The first auxiliary plates 28·28 are formed in a shape where the outer edge is curved. The first auxiliary plates 28·28 are portions that are overlapped on the outside of the second side plate 23 when the assembly is completed. Also, holding portions 29·29 are continuously provided at the upper ends of the first auxiliary plates 28·28 via bent portions, respectively. Engaging portions 30·30 are formed on the holding portions 29·29. The engaging portions 30·30 are formed by a substantially I-shaped through hole that reaches the middle of the upper and lower portions of the holding portion 29·29 from the bent portion between the first auxiliary plate 28·28 and the holding portion 29·29, a tongue piece cut in a substantially U-shaped manner at the upper part thereof, and a bent portion connecting the start end and the end of the U-shaped portion.

[0020] Also, first locking pieces 31·31 are formed on the first auxiliary plates 28·28. The first locking pieces 31·31 are formed by cutting the first auxiliary plates 28·28 into a curved shape with the bent portion between the first auxiliary plates 28·28 and the holding portions 29·29 as the base end.

[0021] On the front and rear edges of the first side panels 22, 22, opposite to the side to which the bottom panel 21 is attached, top panels 32, 32 are attached via bent sections. The top panels 32, 32 are the parts that close off the opening at the top of the box body. Furthermore, a second locking piece 33 is formed on the front first side plate 22. This second locking piece 33 is formed by cutting the front first side plate 22 into a curved shape, with the bent portion between the front first side plate 22 and the front top plate 32 as its base.

[0022] Handle plates 34-34 are attached to the edges of the top plates 32-32 opposite to the side where the first side plates 22-22 are connected, via a bent section. The handle plates 34-34 are designed to facilitate the carrying of the packaging box 1. The bent section between the top plates 32-32 and the handle plates 34-34 is divided midway on both sides, and top plate pieces 35-35 extend from the top plates 32-32 to the divided section. The top plate pieces 35-35 are formed by cuts that protrude towards the handle plates 34-34 beyond the bent section between the top plates 32-32 and the handle plates 34-34. Thus, the handle plates 34-34 are formed to function as handles via the bent section between the top plates 32-32 and the handle plates 34-34 and the top plate pieces 35-35.

[0023] Furthermore, handle protrusions 36,36 are formed at both the left and right ends of each handle plate 34,34, projecting toward the front and rear. In addition, recesses adjacent to the central side of the handle protrusions 36,36 form valleys 37,37.

[0024] Furthermore, the left and right edges of the second side plates 23, 23 each have receiving portions 24, 24 cut out in a roughly U-shape. The receiving portions 24, 24 are the parts into which the first locking pieces 31, 31 are locked, and the cutouts are such that the base ends of the first locking pieces 31, 31 fit snugly.

[0025] Third auxiliary plates 25, 25 are formed at the rear edges of the second side plates 23, 23 via bent portions. The third auxiliary plates 25, 25 are the parts that overlap the rear first side plate 22 when the assembly is complete. Second auxiliary plates 26, 26 are attached to the front edges of the second side plates 23, 23 via a bent portion. The second auxiliary plates 26, 26 are the parts that overlap the inside of the front first side plate 22 when the assembly is complete. A hook piece is provided at the front edge of the second auxiliary plate 26 on the right side by a notch. The left-side second auxiliary plate 26 has two bent sections parallel to the bent section between the second side plate 23 and the second auxiliary plate 26. A notch is provided at the left end of the bent section on the second side plate 23 side. During assembly, a hook piece formed on the right-side second auxiliary plate 26 is locked into this notch.

[0026] Furthermore, during assembly, the bent portion of the second auxiliary plate 26 on the second side plate 23 side can be folded inward to form an auxiliary space for storing coolants and other accessories. The left-side second auxiliary plate 26 has a locking piece formed by cutting a curved shape with the bent portion on the free end as the base, and the left-side second side plate 23 is provided with a notch and a semicircular through hole connected thereto, so that when forming the auxiliary space, the locking piece can be inserted into this notch and fixed in place.

[0027] Furthermore, a receiving portion 27, which is roughly U-shaped, is formed on the right edge of the second auxiliary plate 26 on the right side. The receiving portion 27 is the part to which the second locking piece 33 is locked, and it is cut out so that the base end of the second locking piece 33 fits just right.

[0028] Next, we will explain the process of folding the unfolding sheet 11 to assemble the packaging box 1. Two methods for assembling packaging box 1 will be described: a first assembly method and a second assembly method. In the first assembly method, the left and right second side panels 23, 23 are erected relative to the bottom panel 21, the third auxiliary panel 25 is bent into an angle shape toward the inside of the box body, and then the rear first side panel 22 of the front and rear first side panels 22, 22 is erected first to complete the assembly. In the second assembly method, the left and right second side panels 23, 23 are erected relative to the bottom panel 21, the second auxiliary panels 26, 26 are bent inwards in an angle shape towards the inside of the box body, and the front first side panel 22 is erected first from the front and rear first side panels 22, 22.

[0029] The first assembly method will be explained in detail. Starting from the unfolded sheet state shown in Figure 1, the bent portion between the base plate 21 and the second side plates 23-23 is folded to raise the left and right second side plates 23-23 relative to the base plate 21. Next, the bend between the second side plates 23-23 and the third auxiliary plates 25-25 is bent, and the third auxiliary plates 25-25 are bent inwards towards the box body in an angle shape. Then, the bent portion between the bottom plate 21 and the rear first side plate 22 is bent to make the rear first side plate 22 stand upright relative to the bottom plate 21. At this time, the third auxiliary plates 25, 25 are in a state where they overlap the inside of the box body of the rear first side plate 22. Furthermore, the bent portion between the rear first side plate 22 and the first auxiliary plates 28-28 is bent, and the first auxiliary plates 28-28 are placed on top of the outside of the second side plates 23-23. Then, at the bending portion between the first auxiliary plates 28, 28 and the holding parts 29, 29, when the holding parts 29, 29, which are perpendicular to the bottom plate 21, are bent outwards towards the box body, the first locking pieces 31, 31 move in conjunction with this bending motion, separating from the first auxiliary plates 28, 28 from their flush position and changing angle so that they extend inwards toward the box body relative to the first auxiliary plates 28, 28 (see Figure 4(a)). At this point, the first locking pieces 31, 31 are positioned on the first receiving portions 24, 24 formed on the edges of the second side plates 23, 23. When the holding portions 29, 29 are bent back to a position perpendicular to the bottom plate 21, the first locking pieces 31, 31 also move in conjunction with the bending motion, changing their angle so that they become flush with the first auxiliary plates 28, 28, and extending toward the bottom plate 21, thereby locking the first locking pieces 31, 31 with the first receiving portions 24, 24 (see Figure 4(b)). In this way, the second side plates 23, 23 and the first auxiliary plates 28, 28 can be locked together with an extremely simple bending motion, and the rear first side plate 22 and the second side plates 23, 23 can be held upright, resulting in the semi-assembled state shown in Figure 3.

[0030] Furthermore, in this embodiment, the packaging box 1 can be easily assembled without having to lock the first locking pieces 31, 31 and the first receiving parts 24, 24 during the assembly process, thus demonstrating the advantages of the present invention. In addition, as mentioned above, by locking the first locking pieces 31, 31 and the first receiving parts 24, 24, the rear first side plate 22 and the left and right second side plates 23, 23 can be easily held upright without the need for adhesive bonding. Furthermore, the packaging box 1 can be stored in a semi-assembled state, and multiple boxes can be stacked and stockpiled as needed. When in use, the cake can be placed in the box body from this state and the opening closed, thus improving work efficiency.

[0031] After placing the cake in this semi-finished state, the bent portion between the second side plates 23, 23 and the second auxiliary plates 26, 26 is bent inward into an angle shape to engage the hook piece and notch formed on the second auxiliary plate 26. Then, the front first side plate 22 is folded between the bottom plate 21 and the front first side plate 22, so that the front first side plate 22 stands upright relative to the bottom plate 21. In this state, the second auxiliary plates 26, 26 are overlapped on the inside of the front first side plate 22.

[0032] Next, the bent sections between the front and rear first side panels 22-22 and the top panels 32-32 are bent inward in an angle shape to close the opening on the top surface. Then, the bent sections between the top panels 32-32 and the handle panels 34-34 are bent in an angle shape to make them stand upright relative to the top panels 32-32, and the inner surfaces of the handle panels 34-34 are overlapped so that they come into contact with each other. At this time, the inner surface of one of the top panel pieces 35 is overlapped so that it comes into contact with the outer surface of the other top panel 32. The outer surface of the other top panel piece 32 is overlapped so that it comes into contact with the inner surface of the other top panel 32. By separating the top panel pieces 35-35 from the handle panels 34-34, the handle portion is formed in the separated space.

[0033] Next, the bent portion between the first auxiliary plate 28-28 and the holding portion 29-29 is bent toward the handle plate 34-34, and the handle projection 36-36 is inserted into the engaging portion 30-30 formed on the holding portion 29-29. At this time, the tongue-shaped piece formed on the locking portion 30-30 is accommodated in the valley portion 37-37 formed on the handle plate 24-24, allowing the unit to be stably held upright relative to the top plate 32-32. In this way, the assembled state shown in Figure 2 is achieved.

[0034] Furthermore, in this embodiment, when storing ice packs or other accessories along with the cake, the second auxiliary plate 26 on the left side of the packaging box 1 can be folded to create an auxiliary space for storing these items. Specifically, the bent portion between the second side plates 23, 23 and the second auxiliary plates 26, 26 is bent inward in an angle shape towards the box body, and a hook piece formed on the right second auxiliary plate 26 is hooked into the notch of the left second auxiliary plate 26 to secure it. Then, the bent portion near the notch of the second auxiliary plate 26 is bent inward in an angle shape towards the box body, so that the left second side plate 23 and the second auxiliary plate 26 face each other. Then, a locking piece formed on the free end side of the second auxiliary plate 26 is inserted into a notch formed in the second side plate 23 to secure it, thereby creating an auxiliary space between the left second side plate 23 and the third auxiliary plate 23.

[0035] Next, we will explain the second assembly method in detail. We will omit explanations for parts that are the same as those in the first assembly method.

[0036] First, starting from the unfolded sheet state shown in Figure 1, fold the bent portion between the base plate 21 and the second side plates 23, 23 to raise the left and right second side plates 23, 23 relative to the base plate 21. Next, the bent portion between the second side plates 23, 23 and the second auxiliary plates 26, 26 is bent inward in an angle shape towards the box body, and the hook piece is hooked into the notch to secure it. Furthermore, the front first side plate 22 is folded between the bottom plate 21 and the front first side plate 22 to make the front first side plate 22 stand upright relative to the bottom plate 21. In this state, the second auxiliary plates 26, 26 are overlapped on the inside of the front first side plate 22. Then, when the bent portion between the front first side plate 22 and the front top plate 32 is bent, and the front top plate 32 is bent outwards from a state perpendicular to the bottom plate 21, the second locking piece 33 moves in conjunction with this bending motion, separating from the state flush with the first side plate 22, and its angle changes in a direction extending inwards from the first side plate 22 (see Figure 6(a)). At this point, the second locking piece 33 is positioned on the first receiving portion 27 formed on the upper edge of the second auxiliary plate 26. When the front top plate 32 is bent back to a position perpendicular to the bottom plate 21, the second locking piece 33 also moves in conjunction with the bending motion, changing its angle so that it becomes flush with the front first side plate 22, extending toward the bottom plate 21, and the second locking piece 32 and the second receiving portion 27 are locked together (see Figure 6(b)). In this way, the front first side plate 22 and the second auxiliary plates 26, 26 can be locked together with extremely simple operations, and the front first side plate 22 can be held upright, resulting in the semi-assembled state shown in Figure 5.

[0037] Furthermore, even in the second assembly method, the assembly can be easily performed without locking the second locking piece 33 and the second receiving part 27, thus demonstrating the effectiveness of the present invention. In addition, as mentioned above, by locking the second locking piece 33 and the second receiving part 27, the first front side plate 22 can be easily held upright without the need for adhesive or other bonding processes. Furthermore, the packaging box 1 can be stored in a semi-assembled state, and multiple boxes can be stacked and stocked as needed. When in use, the cake can be placed in the box body from this state and the opening closed, thus improving work efficiency, similar to the packaging box 1 assembled using the first method.

[0038] After placing the cake in this state, the bent portion between the second side plate 23 and the third auxiliary plates 25-25 is bent inward in an angle shape. Then, the section between the bottom plate 21 and the rear first side plate 22 is bent so that the rear first side plate 22 stands upright relative to the bottom plate 21. In this state, the third auxiliary plates 25-25 are overlapped on the inside of the rear first side plate 22. Then, the bent portion between the rear first side plate 22 and the first auxiliary plates 28-28 is bent to overlap the first auxiliary plates 28-28 with the outside of the second side plates 23-23, the bent portion between the first side plates 22-22 and the top plate 32-32 is bent inwards inwards in an angle shape to close the opening on the top surface, the handle plates 34-34 are raised relative to the top plate 32-32, and the handle projections 36-36 are inserted into the engaging portions 30-30 formed on the holding portions 29-29 to fix the handle plates 34-34, resulting in the completed assembly shown in Figure 2.

[0039] In this case as well, when storing ice packs and other supplies along with the cake, the second auxiliary plate 26 can be folded inward to create an auxiliary space for storing them, similar to the first assembly method.

[0040] In the first assembly method, the first locking pieces 31, 31 and the first receiving parts 24, 24 were locked together, but the second locking piece 33 and the second receiving part 27 were not locked together during assembly. However, the second locking piece 33 and the second receiving part 27 may also be locked together during assembly. In the second assembly method, the second locking piece 33 and the second receiving part 27 are locked together, but the first locking pieces 31, 31 and the first receiving parts 24, 24 are not locked together. However, the first locking pieces 31, 31 and the first receiving parts 24, 24 may also be locked together during assembly. In this manner, with the first locking pieces 31, 31 and the first receiving parts 24, 24 locked together, and the second locking piece 33 and the second receiving part 27 locked together, the first side plates 22, 22 and the second side plates 23, 23 remain upright even when the handling projection 36 and the engaging part 30 are released to open the packaging box 1 and the top surface is opened.

[0041] Thus, the packaging box 1 of this embodiment comprises a bottom plate 21, a pair of first side plates 22-22 that stand upright relative to the bottom plate 21, and a pair of second side plates 23-23 adjacent to the first side plates 22-22 and also standing upright relative to the bottom plate 21, with an opening formed at least at the top, and the upper ends of the first side plates 22-22 are provided with a top plate 32-32 that is flexible via a bend to close the opening, and handle plates 34-34 that stand upright from the top plate 32-32, and these handle plates 34-3 4 is a packaging box that has handle projections 36-36 on the second side plate 23-23 side, and first auxiliary plates 28-28 that overlap the outside of the second side plate 23-23 via a bend at the side end of the first side plate 22-22 adjacent to the second side plate 23-23, and the upper edge of the first auxiliary plates 28-28 has a bendable holding part 29 via a bend, and this holding part has a locking part 30, and the handle projections 36 are inserted into this locking part 30 to fix the handle plate 34-34. Therefore, by folding each bend and fixing the handle plates 34, 34, the packaging box 1 can be easily assembled without the need for adhesive or other bonding processes.

[0042] Furthermore, the packaging box is equipped with a first locking piece 31 on the first auxiliary plate 28, 28, and this first locking piece 31 is locked to the second side plate 23, 23 to maintain the upright position of the first side plate 22. Furthermore, the second side panels 23, 23 are provided with a second auxiliary panel 26 at the side end adjacent to the first side panels 22, 22 via a bent portion, which is superimposed on the inside of the first side panel 22. The first side panel 22 is also provided with a second locking piece 33, which is locked to the second auxiliary panel 26 to maintain the upright position of the first side panel 22. Therefore, the first side panel 22 can be easily held upright without the need for adhesive or other bonding processes. Furthermore, the packaging box 1 can be stored in a semi-assembled state, and multiple boxes can be stacked and stocked as needed. When in use, the cake can be placed in the box and the opening closed, thus improving work efficiency. Furthermore, the first locking pieces 31, 31 are formed by cutting into the first auxiliary plates 28, 28, and their angle relative to the first auxiliary plate 28 changes in conjunction with the bending operation of the bent portion between the first auxiliary plates 28, 28 and the holding portion 29, 29. Therefore, with an extremely simple bending operation, the first locking pieces 31, 31 can lock the second side plates 23, 23 and the first auxiliary plates 28, 28, and the upright position of the first side plate 22 can be maintained. Furthermore, the second locking piece 33 is formed by cutting into the first side plate 22, and its angle relative to the first side plate 22 changes in conjunction with the bending movement of the bent portion between the first side plate 22 and the top plate 32. Therefore, with an extremely simple bending operation, the second locking piece 33 can lock the first side plate 22 and the second auxiliary plate 26, and the first side plate 22 can be held upright.

[0043] The technical concept of this invention is not limited to the embodiments described above. For example, the first locking piece may be formed on the second side plate and the first receiving portion on the first auxiliary plate, or the second locking piece may be formed on the second auxiliary plate and the second receiving portion on the first side plate, and the same effects as described above can be obtained. In the unfolded sheet 12 of the packaging box 2 shown in Figure 7, first locking pieces 131, 131 are formed in a convex shape on the left and right edges of the second side plates 23, 23, and rectangular perforated first receiving portions 124, 124 are formed on the first auxiliary plates 28, 28. In addition, a second locking piece 133 is formed in a convex shape on the right end of the second auxiliary plate 26, and a rectangular perforated second receiving portion 127 is formed on the front first side plate 22.

[0044] To assemble packaging box 2, similar to the assembly of packaging box 1, starting from the unfolded sheet shown in Figure 7, the left and right second side plates 23, 23 are raised relative to the bottom plate 21, the folded portion between the second side plates 23, 23 and the third auxiliary plates 25, 25 is bent inwards in an angle shape, and the rear first side plate 22 is raised relative to the bottom plate 21. Also, the first auxiliary plates 28, 28 are placed on top of the outside of the second side plates 23, 23. Then, as shown in Figure 8, by inserting the first locking pieces 131, 131 into the first receiving parts 124, 124, the second side plates 23, 23 and the first auxiliary plates 28, 28 are locked together very easily, and the upright position of the rear first side plate 22 is maintained. Then, by bending the second auxiliary plates 26-26 inwards in an angle shape and locking them together, and inserting the second locking piece 133 into the second receiving portion 127 as shown in Figure 9, the first side plate 22 and the second auxiliary plate 26 are locked together very easily, and the upright position of the front first side plate 22 is maintained. Then, in the same manner as the assembly of packaging box 1, the opening on the top surface is closed and the handle projection 36 is inserted into the locking part 30 and secured, thereby completing the assembly of packaging box 2. [Explanation of symbols]

[0045] 1, 2 Packaging box 11, 12 Spreadsheet 21 Bottom plate 22 First side plate 23 Second side plate 24, 124 First receiving part 25 Third auxiliary plate 26 Second auxiliary plate 27, 127 Second receiving part 28 First auxiliary board 29 Holding part 30 Locking part 31, 131 First locking piece 32 Top plate 33, 133 Second locking piece 34 Handle plate 35 top plate pieces 36 Locking projection 37 Tanibe

Claims

1. It comprises a base plate, a pair of first side plates that stand upright relative to the base plate, and a pair of second side plates adjacent to the first side plates and also standing upright relative to the base plate, with an opening formed at least at the top. The upper end of the first side plate is provided with a top plate that can be bent via a bendable portion to close the opening, and a handle plate that rises from the top plate, and the handle plate is provided with a handle projection on the second side plate side. Furthermore, the side end of the first side plate adjacent to the second side plate is provided with a first auxiliary plate that overlaps the second side plate via a bent portion, the upper end of the first auxiliary plate is provided with a flexible holding portion via a bent portion, and the holding portion is provided with a locking portion. A packaging box characterized by inserting the handle projection into the locking portion to fix the handle plate.

2. A packaging box according to claim 1, characterized in that one of the second side plate and the first auxiliary plate is provided with a first locking piece, and the first locking piece is locked to the other to maintain the upright position of the first side plate.

3. A packaging box according to claim 1 or 2, characterized in that the side end of the second side plate adjacent to the first side plate is provided with a second auxiliary plate that is superimposed on the inside of the first side plate via a bent portion, and either the first side plate or the second auxiliary plate is provided with a second locking piece, and the first side plate is held upright by locking this second locking piece to the other.

4. The packaging box according to claim 2, characterized in that the first locking piece is formed by cutting into the first auxiliary plate, and its angle with respect to the first auxiliary plate changes in conjunction with the bending operation of the bent portion between the first auxiliary plate and the holding portion.

5. The packaging box according to claim 3, characterized in that the second locking piece is formed by cutting into the first side plate, and its angle with respect to the first side plate changes in conjunction with the bending movement of the bent portion between the first side plate and the top plate.

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