Foldable shipping box

Abstract

To provide a foldable transport box that ensures rigidity suitable for folding and assembly, and improves the ease of gripping the handle. [Solution] The foldable transport box B has a transport box body B1 made of thermoplastic synthetic resin and corner members 32 attached to the four upper corners. The transport box body has a main body forming plate having a bottom plate and front side plates 11 and rear side plates 12 continuous with the bottom plate, respectively, and a left side plate and a right side plate independent of the main body forming plate. The left side plate and the right side plate each have a base plate 21 and first folding pieces 22, second folding pieces 23, third folding pieces 24 and fourth folding pieces 25 sequentially continuous with the upper part thereof. The second folding pieces, third folding pieces and fourth folding pieces have substantially the same width dimension, and also substantially the same width dimension as the left side plate and the right side plate. The boundaries between the base plate and the first to fourth folding pieces are sequentially folded outwards to form reinforcing handle frames F on the left side plate and the right side plate.

Description

Technical Field

[0001] The present invention relates to a foldable transport box for transporting articles.

Background Art

[0002] As an invention previously made by the present applicant, in an article transport box that does not assume stacking and does not have a folding function, a configuration is disclosed that ensures a certain strength in the handle portion and facilitates gripping of the handle portion. Specifically, the boundary line between the first folding piece (second folding piece) and the second folding piece (sub-folding piece) is folded in a valley fold, the first folding piece (second folding piece) and the second folding piece (sub-folding piece) are overlapped, and then the boundary line between the first folding piece (second folding piece) and the left and right side plates (second side wall forming plates) is folded in a valley fold and bent outward, and the first folding piece (second folding piece) and the left and right side plates (second side wall forming plates) are overlapped. That is, a handle portion formed by overlapping so as to enclose the second folding piece (sub-folding piece) outward is known (see, for example, FIGS. 10 to 15 of Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the handle portion of the article transport box according to Patent Document 1 above, it is disclosed that the strength of the box body can be improved, and a handle portion (finger hook portion) having a sufficient size for gripping can be formed by larger steps, and the handling during transportation can be made very good.

[0005] In the article transport box without a folding function according to Patent Document 1 above, it has sufficient strength and handling performance in this configuration.

[0006] However, in the case of foldable transport boxes, greater strength is required because the upper parts of the left and right side panels, i.e., the handle locations, are firmly gripped when folding or assembling the boxes, and the upper parts of the left and right side panels are firmly gripped and shaken during assembly. In the above-mentioned Patent Document 1, the frame on the handle side is separated between the sub-folding piece and the left and right connecting pieces, resulting in insufficient rigidity and a tendency to bend, making it unsuitable for gripping. Therefore, in transport boxes with a folding function, further improvements in rigidity and ease of gripping of the handle are required.

[0007] This invention was made in view of the above circumstances, and aims to provide a foldable transport box that can achieve further improvement in the rigidity of the transport box body and improved ease of handling of the handle. [Means for solving the problem]

[0008] The present invention provides a foldable transport box having a transport box body made of thermoplastic synthetic resin and corner members attached to the four upper corners of the transport box body, wherein the transport box body comprises a main body forming plate having a bottom plate and a front side plate and a rear side plate continuous with the bottom plate, respectively, and a left side plate and a right side plate independent of the main body forming plate, and the front side plate, the rear side plate, the left side plate and the right side plate are movable, wherein the left side plate and the right side plate each comprise a base plate and a first folding piece, a second folding piece, a third folding piece and a fourth folding piece sequentially continuous on the upper part thereof, the second folding piece, the third folding piece and the fourth folding piece having substantially the same width dimension, and substantially the same width dimension as the left side plate and the right side plate, and the boundaries between the base plate and the first to fourth folding pieces are sequentially folded outwards to form a reinforcing handle frame on the left side plate and the right side plate, and the present invention provides a foldable transport box to solve the above problem. [Effects of the Invention]

[0009] According to this invention, by sequentially providing a first, second, third, and fourth bent piece, with the second to fourth bent pieces having substantially the same width dimension, and also having substantially the same width dimension as the left or right side panel, a highly rigid reinforcing handle frame can be provided that extends across the width direction of the left or right side panel without any interrupted sections. Furthermore, by providing corner members on the transport box body, the first to fourth bent pieces are fixed, ensuring high rigidity as a transport box. Due to the high rigidity of this configuration, when the reinforcing handle frame is grasped, deflection is greatly reduced, improving ease of handling. [Brief explanation of the drawing]

[0010] [Figure 1] (a) A perspective view of a foldable transport box according to Embodiment 1 of the present invention, and (b) A cross-sectional view of the reinforcing handle frame F. [Figure 2] This is an explanatory diagram showing (a) a main body forming plate and (b) a side plate for constructing a foldable transport box according to Embodiment 1 of the present invention. [Figure 3] This is a partial explanatory cross-sectional view showing the formation sequence of a reinforcing handle frame for a foldable transport box according to Embodiment 1 of the present invention, (a) a heated metal bar H having multiple pressing portions with a V-shape in cross-section is brought close to the left side plate, (b) the left side plate is pressed and melted by the metal bar H, (c) the metal bar H is detached from the left side plate, (d) the continuous cutouts for frame formation are opened and the fourth bent piece is raised, (e) the third bent piece is raised, (f) the second bent piece is raised, and (g) the first bent piece is raised and the reinforcing handle frame is formed. [Figure 4] This is a perspective view showing the assembled state of a foldable transport box according to Embodiment 1 of the present invention. [Figure 5] (a) A perspective view of a foldable transport box according to Embodiment 2 of the present invention, and (b) A cross-sectional view of the reinforcing handle frame F. [Figure 6] This is an explanatory diagram showing (a) a main body forming plate and (b) a side plate for constructing a foldable transport box according to Embodiment 2 of the present invention. [Figure 7]This is a partial explanatory cross-sectional view showing the formation sequence of a reinforcing handle frame for a foldable transport box according to Embodiment 2 of the present invention, (a) a heated metal bar H having multiple pressing portions with a V-shape in cross-section is brought close to the left side plate, (b) the left side plate is pressed and melted by the metal bar H, (c) the metal bar H is detached from the left side plate, (d) the fourth folded piece is raised, (e) the third folded piece is raised, (f) the second folded piece is raised, and (g) the first folded piece is raised to form the reinforcing handle frame. [Modes for carrying out the invention]

[0011] A foldable transport box according to one embodiment of the present invention comprises a transport box body made of thermoplastic synthetic resin and corner members attached to the four upper corners of the transport box body, the transport box body comprising a body forming plate having a bottom plate and a front side plate and a rear side plate continuous with the bottom plate, and a left side plate and a right side plate independent of the body forming plate, the front side plate, the rear side plate, the left side plate and the right side plate are movable, in a foldable transport box, the left side plate and the Each right panel comprises a substrate and sequentially continuous first, second, third, and fourth folded pieces on its upper surface, the second, third, and fourth folded pieces having substantially the same width dimension, and substantially the same width dimension as the left and right panels, and the boundaries between the substrate and the first to fourth folded pieces are sequentially folded outwards, thereby forming a foldable transport box with reinforcing handle frames on the left and right panels (first configuration).

[0012] According to the first configuration described above, the reinforcing handle frame is provided with a first bent piece, a second bent piece, a third bent piece, and a fourth bent piece in sequence, with the second to fourth bent pieces having approximately the same width dimension, and also having approximately the same width dimension as the left or right side panel. As a result, a highly rigid reinforcing handle frame can be provided that extends across the width direction of the left or right side panel without any interrupted sections. Furthermore, by providing corner members on the transport box body, the first to fourth bent pieces are fixed in place, ensuring high rigidity as a transport box. Due to the high rigidity of this configuration, when the reinforcing handle frame is grasped, deflection is greatly reduced, improving ease of handling.

[0013] Furthermore, a foldable transport box according to another embodiment of the present invention may have the first configuration described above, and the reinforcing handle frame may have a structure in which a V-shaped groove in cross-section, which is continuously formed in the width direction on the outer surface of the boundary portions of the substrate and the first to fourth folded pieces, is fixed in a closed state (second configuration).

[0014] According to the second configuration described above, in addition to achieving the effects of the first configuration, the reinforcing handle frame has a structure in which a V-shaped groove in cross-section, which is continuously formed in the width direction on the outer surface of the boundary portions of the substrate and the first to fourth bent pieces, is fixed in a closed state, thereby making it possible to further increase rigidity.

[0015] Furthermore, a foldable transport box according to another embodiment of the present invention has the above-described first configuration, and the reinforcing handle frame is fixed in a closed state in which V-shaped grooves formed continuously in the width direction on the outer surface side of the boundary portions between the substrate and the first to third folded pieces, and notches formed continuously in the width direction on the inner surface side of the boundary portion between the third and fourth folded pieces are fixed in an open state, and a step can be formed between the third and fourth folded pieces (third configuration).

[0016] According to the above-described third configuration, in addition to achieving the operational effects of the first configuration, by providing a structure in which the groove having a V-shaped cross section is fixed in a closed state and a structure in which the cut portion continuously formed in the width direction on the inner surface side of the boundary portion between the third bent piece and the fourth bent piece is fixed in an open state, the fourth bent piece can be easily brought into close contact with the substrate and the second bent piece, and further, the rigidity can be increased. Further, since a step is formed by the third bent piece and the fourth bent piece, there is an advantage that the finger grip is further improved.

[0017] Hereinafter, with reference to the drawings, a foldable transport box B according to an embodiment of the present invention will be described. The same or corresponding parts in the drawings are denoted by the same reference numerals and their descriptions will not be repeated. In order to make the description easier to understand, in the drawings referred to below, the configurations are shown in a simplified or schematic manner, or some of the constituent members are omitted. Also, the dimensional ratios between the constituent members shown in each drawing do not necessarily represent the actual dimensional ratios.

Embodiment

[0018] The foldable transport box B according to Embodiment 1 of the present invention is a transport box B having an opening B2 at the upper side. As shown in FIGS. 1(a) and 2, a main forming plate 1 for forming a transport box body B1, a left side plate 2A, a right side plate 2B, four vertical frame upper bodies 30 for forming vertical frames at the four corners of the transport box body B1, four vertical frame lower bodies 31, four corner members 32 arranged at the upper parts of the four corners of the transport box body B1, and two frame members 33 provided between the corner members 32, 32 at positions corresponding to the upper parts when the front side plate 11 and the rear side plate 12 of the main forming plate 1 are assembled.

[0019] In this Embodiment 1, the main forming plate 1 is formed of a thermoplastic hollow synthetic resin plate such as polypropylene. The main forming plate 1 has a bottom plate 10 arranged at the center, a front side plate 11 continuous with the front of the bottom plate 10, and a rear side plate 12 continuous with the rear of the bottom plate 10.

[0020] <000009Locking holes 11a, 12a and notches 11b, 12b are provided on the left and right sides of the upper part of the front side plate 11 and the left and right sides of the upper part of the rear side plate 12, respectively. The locking holes 11a, 12a are holes for engaging the locking claws (not shown) of the corner member 32 during assembly, and the notches 11b, 12b are recesses for positioning the corner member 32 during assembly.

[0021] A left guide piece 10a is provided on the left side of the base plate 10, and a right guide piece 10b is provided on the right side of the base plate 10. The left guide piece 10a is a guide piece that contacts the left side plate 2A during assembly to fix the left side plate 2A, and the right guide piece 10b is a guide piece that contacts the right side plate 2B during assembly to fix the right side plate 2B.

[0022] The front plate 11 and the rear plate 12 have the same shape and function. The front plate 11 and the rear plate 12 are provided symmetrically on either side of the bottom plate 10. For this reason, we will describe the front plate 11, and omit the description of the rear plate 12.

[0023] The front side plate 11 has a first continuous cut section 110 located approximately in the center in the front-to-back direction (height direction when assembled), which is provided horizontally in the left-to-right direction, a second continuous cut section 111 located parallel to the first continuous cut section 110 and below it, and a third continuous cut section 112 located above the first continuous cut section 110. Both ends of the first continuous cut section 110 are provided with a known tear-prevention structure 113.

[0024] The width dimension of the front side plate 11 is formed to be narrower than the width dimension of the bottom plate 10 of the main forming plate 1 excluding the left guide piece 10a and the right guide piece 10b. The narrow left and right edges are fitted with the vertical frame upper body 30 and vertical frame lower body 31, which constitute the vertical frame, so that the final width dimension is secured by the vertical frame. The vertical frame upper body 30 and vertical frame lower body 31 are provided in a range that does not hinder the bending of the front side plate 11 by the first to third continuous cut sections 110, 111, and 112. The cuts in these continuous cut sections 110, 111, and 112 are made to a position midway in the thickness direction, but the depth of the cut does not necessarily have to be half the thickness of the plate. It is sufficient that the cuts enable smooth bending so that one of the front and back liners is not cut, while also providing sufficient strength so that the uncut portion does not easily separate.

[0025] The left plate 2A and the right plate 2B are constructed separately from the main forming plate 1. The left plate 2A and the right plate 2B have the same shape and the same function. Therefore, the explanation will focus on the left plate 2A, and the explanation of the right plate 2B will be omitted.

[0026] The left plate 2A and the right plate 2B are constructed separately from the main forming plate 1. The left plate 2A and the right plate 2B have the same shape and the same function. Therefore, the explanation will focus on the left plate 2A, and the explanation of the right plate 2B will be omitted.

[0027] The left side plate 2A has a flat base plate 21, and a first bent piece 22, a second bent piece 23, a third bent piece 24, and a fourth bent piece 25 are provided sequentially on the upper side of the base plate 21. The first bent piece 22 is formed to be narrower than the second bent piece 23, the third bent piece 24, and the fourth bent piece 25. The second bent piece 23, the third bent piece 24, and the fourth bent piece 25 are formed to have the same width dimension. The width dimensions of the second to fourth bent pieces 23, 24, and 25 are approximately the same as the width dimension of the base plate 21. In this embodiment, strictly speaking, the width dimension of the base plate 21 is slightly larger in order to attach the corner member 32. However, because the width dimensions of the second to fourth bent pieces 23, 24, and 25 are approximately the same as the width dimension of the base plate 21, the rigidity of the reinforcing handle frame F formed over the entire width direction is ensured.

[0028] The left and right corner members 32 at the upper part of the substrate 21 (the base position where the first bent piece 22 is formed) are provided with locking holes 21a for engaging the corner members 32. In addition, a fourth continuous cut portion 210 is provided at the upper part of the outer surface of the substrate 21.

[0029] Furthermore, the second bent piece 23 is provided with locking holes 23a on its left and right sides for engaging the corner member 32.

[0030] The upper part of the left panel 2A is configured with a reinforcing handle frame F by performing the following process.

[0031] First, a heated metal bar H having multiple pressing portions with V-shaped cross-sections is applied simultaneously to each boundary line of the substrate 21, the first bent piece 22, the second bent piece 23, the third bent piece 24, and the fourth bent piece 25 to form molten V-shaped grooves in each boundary line (Figures 3(a) to (c)).

[0032] Next, as shown in Figure 3(d), the fourth bent piece 25 is raised toward the third bent piece 24, and the V-shaped groove in the cross-section of the boundary line between the 44th bent piece 25 and the third bent piece 24 is closed and welded. Then, as shown in Figure 3(e), the third bent piece 24 is raised, and the V-shaped groove in the cross-section of the boundary line between the third bent piece 24 and the second bent piece 23 is closed and welded. After that, as shown in Figure 3(f), the second bent piece 23 is raised, and the V-shaped groove in the cross-section of the boundary line between the second bent piece 23 and the first bent piece 22 is closed and welded. Next, as shown in Figure 3(g), the first bent piece 22 is raised, and the V-shaped groove in the cross-section of the boundary line between the first bent piece 22 and the substrate 21 is closed and welded.

[0033] As a result, the boundaries between the substrate 21 and the first to fourth bent pieces 22, 23, 24, and 25 are bent outward at approximately right angles across almost the entire width of the left side plate 2A, forming the reinforcing handle frame F. This suppresses deflection across the entire width of the left side plate. Furthermore, the third bent piece 24 suppresses deflection across the entire width.

[0034] Although the V-shaped groove in the cross-section is welded in a closed state, it is not necessarily required to weld the entire structure. For example, it is possible to fold only the boundary between the fourth folded piece 25 and the third folded piece 24 and leave it unwelded. This is because the reinforcing handle frame F is ultimately sandwiched by the corner members, so even without welding, the base plate, the second folded piece, and the fourth folded piece are tightly bonded together.

[0035] Next, we will explain how to assemble the foldable transport box B.

[0036] To form the transport box body B1, first, the upper vertical frame 30 and the lower vertical frame 31 are attached to the left and right ends of the front side plate 11 and the rear side plate 12, respectively.

[0037] Next, a heated metal bar (not shown) with a V-shaped cross-section is used to press and heat the boundary between the bottom plate 10 and the left guide piece 10a, and the boundary between the bottom plate 10 and the right guide piece 10b of the main forming plate 1, causing them to melt. This raises the left guide piece 10a and the right guide piece 10b relative to the bottom plate 10, and the molten surfaces are heat-welded together. This fixes the left guide piece 10a and the right guide piece 10b of the main forming plate 1 in an upright position.

[0038] Then, the boundaries between the bottom plate 10 and the front side plate 11, and the boundary between the bottom plate 10 and the rear side plate 12 in the main forming plate 1 are melted using a heated metal bar (not shown) whose pressing portion has a V-shape in cross-section, thereby fixing the front side plate 11 and the rear bottom plate 12 to the bottom plate 10 in an upright position. At this time, both ends of the left guide piece 10a and the right guide piece 10b are also heated and melted, and are fused and fixed to the lower ends of both ends of the front side plate 11 and the lower ends of both ends of the rear side plate 12.

[0039] As shown in Figure 4, the left plate 2A and the right plate 2B, on which the reinforcing handle frame F is formed, are erected by abutting them against the left guide piece 10a and the right guide piece 10b, respectively. Frame members 33 are attached to the upper edges 11c and 12c of the front plate 11 and the rear plate 12, and corner members 32 are attached to the four corners of the upper part formed by the side plates 11, 12, 2A, and 2B. The corner members 32 have locking claws for engagement (not shown) formed thereon, and the locking holes 11a, 12a, 21a, and 23a of each side plate engage with the locking claws of the corner members, fixing the upper part of each side plate.

[0040] In this state, the left panel 2A and the right panel 2B can be folded in a mountain fold from the upper fourth continuous cut section 210, and the front panel 11 and the rear panel 12 can be folded in a valley fold at the first continuous cut section 110, and in a mountain fold at the second continuous cut section 111 and the third continuous cut section 112. The left panel 2A and the right panel 2B can be folded and stored inside the transport box body B1, and the front panel 11 and the rear panel 12 can be folded in a V-shape so that the first continuous cut section 110 fits inside the box. As a result, the upper opening and the bottom panel 10 of the transport box body B1 are close together, allowing it to be folded. [Examples]

[0041] The foldable transport box B according to Embodiment 2 of the present invention is a foldable transport box B having lid pieces 13a and 13b that are continuous from the base 10 via the front side plate 11 and the rear side plate 12, respectively, as shown in Figures 5 and 6. The common configuration of Embodiment 2 with Embodiment 1 will be omitted except for parts that need to be explained.

[0042] The transport box body B1 is composed of a main forming plate 1, a left side plate 2A, a right side plate 2B, four upper vertical frame bodies 30 and four lower vertical frame bodies 31 for forming the vertical frames at the four corners of the transport box body B1, and four corner members 32 positioned at the top of the four corners of the transport box body B1. In this embodiment 2, the foldable transport box B has lid pieces 13a and 13b, and a part of them overlaps with the front side plate 11 and the rear side plate 12 to serve as reinforcement, so it does not have the two frame members 33 used in embodiment 1.

[0043] The foldable transport box B according to this embodiment 2 has reinforcing handle frames F on the left side panel 2A and the right side panel 2b, similar to embodiment 1, but its configuration differs slightly from that of embodiment 1.

[0044] In this embodiment 2 as well, the main forming plate 1 is made of a thermoplastic hollow synthetic resin plate such as polypropylene. The main forming plate 1 has a bottom plate 10 positioned in the center, a front side plate 11 that is continuous in front of the bottom plate 10, a front cover piece 13a that is continuous further in front of the front side plate 11, a rear side plate 12 that is continuous behind the bottom plate 10, and a rear cover piece 13b that is continuous further behind the rear side plate 12. The boundary between the front side plate 11 and the front cover piece 13a, and the boundary between the rear side plate 12 and the rear cover piece 13b, have V-shaped grooves formed by a heated metal bar (not shown) with a V-shaped cross-section. By bending it to close the V-shape, it is possible to bend it at a right angle.

[0045] As described above, in Example 2, the left panel 2A and the right panel 2B have the same configuration, so we will describe the left panel 2A.

[0046] In Example 2, the left plate 2A is identical in that it has a substrate 21 and, sequentially above the substrate 21, a first bent piece 22, a second bent piece 23, a third bent piece 24, and a fourth bent piece 25. It is also identical in that the first bent piece 22 is formed to be narrower than the other bent pieces 23, 24, and 25, and the other bent pieces 23, 24, and 25 have approximately the same width dimensions.

[0047] This embodiment 2 differs in that it has a continuous frame-forming cut portion 211 at the boundary between the third folded piece 24 and the fourth folded piece, which is on the inner side.

[0048] The upper part of the left panel 2A is configured with a reinforcing handle frame F by performing the following process.

[0049] First, a heated metal bar H having multiple pressing portions with V-shaped cross-sections is applied simultaneously to each boundary line of the substrate 21, the first bent piece 22, the second bent piece 23, and the third bent piece 24 to form molten V-shaped grooves in each boundary line (Figures 7(a) to (c)).

[0050] Next, as shown in Figure 7(d), the continuous cut section 211 for frame formation is opened to about 90 degrees, and the fourth bent piece 25 is raised toward the third bent piece 24. Then, as shown in Figure 7(e), the third bent piece 24 is raised, and the V-shaped groove in the cross-section of the boundary line between the third bent piece 24 and the second bent piece 23 is closed and welded. After that, as shown in Figure 7(f), the second bent piece 23 is raised, and the V-shaped groove in the cross-section of the boundary line between the second bent piece 23 and the first bent piece 22 is closed and welded. Next, as shown in Figure 7(g), the first bent piece 22 is raised, and the V-shaped groove in the cross-section of the boundary line between the first bent piece 22 and the substrate 21 is closed and welded.

[0051] As described above, similar to Example 1, the boundaries between the substrate 21 and the first to fourth bent pieces 22, 23, 24, and 25 are bent outward at approximately right angles over almost the entire width of the left side plate 2A, thereby forming the reinforcing handle frame F. This suppresses deflection over the entire width of the left side plate.

[0052] As shown in Figure 7(g), in the reinforcing handle frame F of Embodiment 2, a step S is formed between the third bent piece 24 and the fourth bent piece 25 because the continuous cut portion 211 for frame formation is opened by about 90 degrees. The step S is formed by the fact that the lower surface of the outer 34th bent piece 24 is located lower than the lower surface of the inner 4th bent piece 25. This improves the grip of the fingers and further enhances ease of handling.

[0053] The foldable transport box B according to the embodiment described above is formed from a hollow synthetic resin sheet as described above. However, the transport box B according to the present invention is not limited to being formed from a hollow synthetic resin sheet, and for example, a low-foaming synthetic resin sheet can also be used. Examples of hollow synthetic resin sheets include a hollow synthetic resin sheet with parallel ribs arranged between two upper and lower sheets, a hollow synthetic resin sheet with a honeycomb structure core material connected between two upper and lower sheets (for example, product name: Texcel®, manufactured by Gifu Plastics Co., Ltd.), and a three-layer hollow laminated sheet formed by heat-fusing a cylindrical vacuum-formed polypropylene sheet with two upper and lower sheets (product name: Plapearl®, manufactured by Kawakami Sangyo Co., Ltd.). These can be coated with a durable antistatic material as needed. [Explanation of Symbols]

[0054] B Shipping box B1 Shipping box body B2 opening F Reinforcement handle frame S step 1 Main forming plate 10 Bottom plate 10a Left guide piece 10b Right guide piece 11 Front side panel 110 First continuous cut section 111 Second continuous cut section 112 Third continuous cut section 113 Known tear-resistant structures 12 Back side plate 11a Locking hole 11b Notch 11c Top 12a Locking hole 12b Notch 12c Top 13 Lid piece 13a Front cover piece 13b Rear cover piece 21a Locking hole 23a Locking hole 2A Left side plate 2B Right side plate 21 circuit boards 210 Fourth continuous cut section 211 Continuous cut section for frame formation 22 1st folded piece 23 2nd folded piece 24 3rd folded piece 25 4th folded piece 30 Vertical frame upper body 31 Vertical frame lower body 32 Corner members

Claims

1. A foldable transport box having a transport box body made of thermoplastic synthetic resin and corner members attached to the four upper corners of the transport box body, wherein the transport box body comprises a main body forming plate having a bottom plate and a front side plate and a rear side plate continuous with the bottom plate, and a left side plate and a right side plate independent of the main body forming plate, the front side plate, the rear side plate, the left side plate and the right side plate being movable, The left and right plates each comprise a substrate and a first, second, third, and fourth folded piece that are sequentially continuous on its upper surface. The second, third, and fourth folded pieces have substantially the same width dimension, and also have substantially the same width dimension as the left and right plates. A foldable transport box in which the boundaries of the substrate and the first to fourth bent pieces are sequentially bent outwards, thereby forming reinforcing handle frames on the left and right panels.

2. The foldable transport box according to claim 1, wherein the reinforcing handle frame is fixed in a closed state, with V-shaped grooves formed continuously in the width direction on the outer surface of the boundary portions of the substrate and the first to fourth folded pieces.

3. The reinforcing handle frame has a structure in which a V-shaped groove in cross-section, formed continuously in the width direction on the outer surface side of the boundary portions between the substrate and the first to third folded pieces, is fixed in a closed state, and a notch, formed continuously in the width direction on the inner surface side of the boundary portion between the third and fourth folded pieces, is fixed in an open state, and the third and fourth folded pieces have a step difference.

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