Transportation cart

Abstract

To provide a transportation cart whose panels can be readily folded and which can be nested together with other transportation carts.SOLUTION: A transportation cart 10 includes a cart body 50, and plural panels 11 to 16 that can be deployed or folded relative to the cart body 50. The plural panels 11 to 16 can be brought to a deployed condition where the panels 11 to 16 are deployed like a box, and a folded condition where the panels 11 to 16 are folded so that the transportation cart can be nested together with other transportation carts 10.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] This embodiment relates to a transport cart that can be nested with other transport carts. [Background technology]

[0002] Conventionally, for example, in stores and factories, transport carts for transporting food and other loads have been used. Such transport carts have a cart body having a pair of side frames, and a heat-insulating cart cover is attached to the cart body in order to keep the food and other loads warm, cold, or protected. For example, one disclosed in Patent Document 1 is known as such a transport cart. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-233970 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, conventional dolly covers for transport dollies are generally made of, for example, sewn sheet materials, and are thin and flexible (see Patent Document 1). Therefore, the conventional dolly covers have a problem in that it is difficult to sufficiently improve the heat insulation performance or sufficiently protect the load inside.

[0005] On the other hand, it is also possible to assemble the insulation panels into a box shape and mount them on the cart body, but in this case, the work of disassembling and folding the insulation panels may be cumbersome. Also, depending on the positional relationship of the insulation panels after disassembly, there is a problem that it may be difficult to nest the transport cart with other transport carts.

[0006] An object of the present disclosure is to provide a transport cart whose panels are easy to fold and which can be nested with other transport carts. [Means for solving the problem]

[0007] The transport cart according to this embodiment is a transport cart that can be nested with other transport carts, and comprises a cart body having a first side frame, a second side frame, and connecting members that connect the first side frame and the second side frame to each other, and a plurality of panels that are freely unfolded and foldable relative to the cart body, and the plurality of panels can be taken into an unfolded state in which the plurality of panels are unfolded into a box shape, and a folded state in which the plurality of panels can be folded to be nested with the other transport carts, and in the folded state, at least a portion of each panel is folded around the first side frame or the second side frame, respectively, to form a first panel group including the first side frame and a second panel group including the second side frame, and when the thicker of the total thickness of the first panel group and the total thickness of the second panel group is T and the number of the nestable transport carts is n, the rear panel of the plurality of panels located on the rear side is opened horizontally by a width of (n-1) x T or more.

[0008] In the transport cart according to this embodiment, in the folded state, a part of the rear panel may remain on the rear side without being folded.

[0009] In the transport cart according to this embodiment, the cart body may have two wheels below the first side frame and two wheels below the second side frame.

[0010] In the transport cart according to this embodiment, each panel may include a heat insulating panel.

[0011] In the transport cart according to this embodiment, the insulating panel may include a vacuum insulating material or a foam insulating material.

[0012] In the transport cart of this embodiment, the multiple panels may include at least a top panel, a front panel, the back panel, a first side panel on the first side frame side, and a second side panel on the second side frame side.

[0013] In the transport cart according to this embodiment, the plurality of panels may further include a bottom panel.

[0014] In the transport dolly according to this embodiment, the front panel may include a plurality of foldable front partial panels.

[0015] In the transport cart of this embodiment, the cart body further has a foldable bottom plate, and the bottom plate may be folded around the first side frame or the second side frame to form the first panel group or the second panel group.

[0016] In the transport cart according to this embodiment, the plurality of panels may be attached detachably to one another.

[0017] In the transport cart of this embodiment, the multiple panels include a panel provided with a clamped portion and a panel provided with a clamping portion that clamps the clamped portion, and the clamped portion and the clamping portion may each be provided with a hook-and-loop fastener.

[0018] In the transport cart according to this embodiment, the clamping portion may have a loop portion of a hook-and-loop fastener. Effect of the Invention

[0019] According to this embodiment, the panel can be easily folded and can be nested with other transport carts. [Brief description of the drawings]

[0020] [Figure 1]FIG. 1 is an exploded perspective view showing a state in which each panel of a transportation cart according to a first embodiment has been removed. [Diagram 2] FIG. 2 is a perspective view showing the transportation cart according to the first embodiment, with each panel in an unfolded state. [Diagram 3] FIG. 3 is a perspective view showing the transportation cart according to the first embodiment, with each panel in a folded state. [Figure 4] FIG. 4 is a perspective view showing the carriage body. [Diagram 5] FIG. 5 is a partially enlarged front view of the carriage body. [Figure 6] FIG. 6 is a cross-sectional view showing each panel. [Figure 7] 7(a) and (b) are cross-sectional views showing the vacuum insulation materials of each panel. [Figure 8] 8(a) and 8(b) are a plan view and a front view, respectively, showing the state before each panel of the transportation cart according to the first embodiment is changed from the unfolded state to the folded state. [Figure 9] 9(a) and 9(b) are a plan view and a front view, respectively, showing a process of changing the front panel of the transportation cart according to the first embodiment from an unfolded state to a folded state. [Figure 10] 10(a)-(c) are plan views showing a process of changing the front panel of the transportation cart according to the first embodiment from an unfolded state to a folded state. [Figure 11] 11(a) and (b) are a plan view and a front view, respectively, showing a process of changing the front panel of the transportation cart according to the first embodiment from an unfolded state to a folded state. [Figure 12] 12(a) and 12(b) are a plan view and a front view, respectively, showing a process of changing the bottom panel of the transportation cart according to the first embodiment from an unfolded state to a folded state. [Figure 13] 13(a) and 13(b) are a plan view and a front view, respectively, showing a process of changing the bottom plate of the transportation cart according to the first embodiment from an unfolded state to a folded state. [Figure 14]14(a) and 14(b) are a plan view and a front view, respectively, showing a process of changing the top panel of the transportation cart according to the first embodiment from an unfolded state to a folded state. [Figure 15] 15(a)-(c) are plan views showing a process of changing the rear panel of the transportation cart according to the first embodiment from an unfolded state to a folded state. [Figure 16] 16(a)-(c) are plan views showing the process of nesting multiple transport cars. [Figure 17] 17(a) and 17(b) are schematic plan views for explaining the operation when the transport carts are nested. [Figure 18] FIG. 18 is a plan view showing a transportation cart according to one modified example, with each panel in an unfolded state. [Figure 19] FIG. 19 is a perspective view showing a carriage body according to one modified example. [Figure 20] FIG. 20 is a perspective view showing the transportation cart according to the second embodiment, with each panel in an unfolded state. [Figure 21] FIG. 21 is a perspective view showing the transportation cart according to the second embodiment, with only the front panel in a folded state. [Figure 22] FIG. 22 is a perspective view showing the transportation cart according to the second embodiment, with each panel in a folded state. [Diagram 23] 23(a)-(c) are plan views showing a process of changing the front panel of the transportation cart according to the second embodiment from an unfolded state to a folded state. [Figure 24] 24(a) to 24(c) are front views showing a process of changing the top panel of the transportation cart according to the second embodiment from an unfolded state to a folded state. [Diagram 25] 25(a) and (b) are plan views showing a process of changing the rear panel of the transportation cart according to the second embodiment from an unfolded state to a folded state. [Figure 26]26(a) to 26(c) are front views showing a process of changing the bottom panel of the transportation cart in a modified example of the second embodiment from an unfolded state to a folded state. [Figure 27] 27(a) and (b) are partially enlarged plan views showing the attachment portion between the front panel and the first side panel in the second embodiment. [Figure 28] FIG. 28(a) is a partially enlarged plan view showing the attachment portion between the front panel and the first side panel in the second embodiment, and FIG. 28(b) is a partially enlarged plan view showing the first side panel in the second embodiment. [Figure 29] FIG. 29 is a partial enlarged plan view showing an attachment portion between the front panel and the first side panel in a modification of the second embodiment. [Diagram 30] FIG. 30 is a partial enlarged plan view showing an attachment portion between the rear panel and the first side panel in the second embodiment. [Diagram 31] FIG. 31 is a partially enlarged front view showing an attachment portion between the top panel and the first side panel in the second embodiment. [Diagram 32] FIG. 32 is a partially enlarged front view showing the attachment portion between the bottom panel and the gap panel in the second embodiment. [Diagram 33] FIG. 33 is a cross-sectional view showing each panel in the second embodiment. [Diagram 34] 34(a) and (b) are partially enlarged plan views showing the attachment portion between the rear panel and the first side panel in a modification of the second embodiment. [Diagram 35] 35(a) and (b) are partially enlarged front views showing the attachment portion between the top panel and the first side panel in a modification of the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] (First embodiment) The first embodiment will be described below with reference to the drawings. Each of the figures shown below is a schematic diagram. Therefore, the size and shape of each part are appropriately exaggerated to facilitate understanding. In addition, it is possible to carry out appropriate modifications within the scope of the technical idea. In each of the figures shown below, the same parts are given the same reference numerals, and some detailed explanations may be omitted. In addition, the numerical values ​​such as the dimensions of each member and the material names described in this specification are examples of the embodiment, and are not limited to these, and can be appropriately selected and used. In this specification, terms that specify shapes and geometric conditions, such as parallel, orthogonal, and vertical, are intended to include substantially the same state in addition to their strict meanings.

[0022] In the following embodiments, the "X direction" refers to a direction parallel to the longitudinal direction of the transport cart and parallel to the floor surface on which the transport cart is placed, and the "Y direction" refers to a direction perpendicular to the X direction and parallel to the floor surface on which the transport cart is placed. The "Z direction" refers to a direction parallel to the vertical direction. The "front" refers to a surface perpendicular to the floor surface that faces the direction in which other transport carts enter when nesting, and the "back" refers to a surface perpendicular to the floor surface that faces the front. The "top surface" refers to a surface parallel to the floor surface that is the upper side of the transport cart, and the "bottom surface" refers to a surface parallel to the floor surface that is the lower side of the transport cart. The "side surface" refers to a surface perpendicular to the floor surface that is the longitudinal end side of the transport cart.

[0023] (Configuration of the transport cart) The configuration of the transport dolly according to this embodiment will be described with reference to Figs. 1 to 5. Fig. 1 is an exploded perspective view showing the state in which the panels of the transport dolly according to this embodiment have been removed. Fig. 2 is a perspective view of the transport dolly according to this embodiment in an unfolded state. Fig. 3 is a perspective view of the transport dolly according to this embodiment in a folded state. Fig. 4 is a perspective view of the dolly body. Fig. 5 is a partially enlarged front view of the dolly body.

[0024] As shown in Fig. 1, a transport cart 10 according to this embodiment includes a cart body 50 and a plurality of (six in this case) panels 11-16 that are each provided so as to be freely unfolded and folded with respect to the cart body 50. Of these, the plurality of panels 11-16 can be in an unfolded state (see Fig. 2) in which they are unfolded and assembled into a box shape, or in a folded state (see Fig. 3) in which the plurality of panels 11-16 can be folded to enable nesting with other transport carts.

[0025] The transport dolly 10 is used, for example, in stores, factories, logistics processes, etc., when storing or transporting loads that require cooling or heating. Such a transport dolly 10 is configured such that a storage space 20 (described later) capable of storing loads is surrounded by six panels 11-16, thereby minimizing temperature changes inside the transport dolly 10. On the other hand, when the transport dolly 10 is not in use, it can be nested (stacked in a nested manner) with other identical transport dollies 10, allowing multiple transport dollies 10 to be stored compactly.

[0026] Next, the configuration of the dolly body 50 will be described with reference to Fig. 4. Fig. 4 is a perspective view showing the dolly body 50. As shown in Fig. 4, the dolly body 50 has a first side frame 51, a second side frame 52, and a connecting member 53 that connects the first side frame 51 and the second side frame 52 to each other. In this case, the dolly body 50 has six wheels 61 to 66, and the wheels 61 to 66 are attached to the connecting member 53 so as to face downward.

[0027] The first side frame 51 is provided at one longitudinal end (negative end in the X direction) of the carriage body 50, and protrudes upward (positive side in the Z direction) from the connecting member 53. The first side frame 51 has a lower support part 54 connected to the connecting member 53, an annular (rectangular) peripheral frame 55 connected to the lower support part 54, and a plurality of horizontal bars 56 each extending in the horizontal direction (Y direction) inside the peripheral frame 55. The multiple horizontal bars 56 are disposed at equal intervals from each other in the up-down direction (Z direction). Two wheels 61, 62 are provided below the first side frame 51.

[0028] The second side frame 52 is provided at the other longitudinal end (positive end in the X direction) of the cart body 50, and protrudes upward (positive side in the Z direction) from the connecting member 53. The configuration of the second side frame 52 is substantially the same as the configuration of the above-mentioned first side frame 51. Two wheels 65, 66 are provided below the second side frame 52.

[0029] The connecting member 53 is roughly O-shaped when viewed from the top (the shape of two "E" letters back to back), and has a central frame 57 extending in the longitudinal direction (X direction) of the bogie body 50, and three wheel mounting frames 67-69 each connected to the central frame 57.

[0030] The central frame 57 is located at approximately the center in the width direction (Y direction) of the dolly body 50. The central frame 57 has sufficient strength to hold the load of the transport dolly 10 and its cargo, while having a narrow width that does not interfere with nesting the transport dollies 10 together. Specifically, the width Wa (length in the Y direction) of the central frame 57 may be 5% or more and 33% or less of the maximum width Wb (length in the Y direction) of the dolly body 50. The intervals Pa, Pb may be, for example, 20 mm or more and 200 mm or less, depending on the maximum width Wb of the dolly body 50.

[0031] The three wheel mounting frames 67-69 each extend in a direction (Y direction) perpendicular to the central frame 57. The wheel mounting frames 67-69 consist of a first wheel mounting frame 67 located on the first side frame 51 side, a second wheel mounting frame 68 located between the first side frame 51 and the second side frame 52, and a third wheel mounting frame 69 located on the second side frame 52 side.

[0032] The first wheel mounting frame 67 and the second wheel mounting frame 68 are arranged at a distance Pa in the longitudinal direction (X direction) of the bogie body 50. The second wheel mounting frame 68 and the third wheel mounting frame 69 are arranged at a distance Pb in the longitudinal direction (X direction) of the bogie body 50. In this case, the distance Pa between the first wheel mounting frame 67 and the second wheel mounting frame 68 may be equal to the distance Pb between the second wheel mounting frame 68 and the third wheel mounting frame 69 (Pa=Pb), or may be different from the distance Pb.

[0033] The first wheel mounting frame 67 is provided at one longitudinal end (negative end in the X direction) of the central frame 57. A first wheel 61 and a second wheel 62 are attached to both longitudinal ends (both ends in the Y direction) of the first wheel mounting frame 67, respectively.

[0034] The second wheel mounting frame 68 is provided at the longitudinal center (X-direction center) of the central frame 57. A third wheel 63 and a fourth wheel 64 are attached to both longitudinal ends (Y-direction ends) of the second wheel mounting frame 68, respectively. The width (length in the X-direction) Wc of the second wheel mounting frame 68 is narrow enough not to interfere with nesting the transport carts 10 together. Specifically, the width Wc of the second wheel mounting frame 68 may be 3.7% or more and 12.6% or less of the maximum length (length in the X-direction) La of the cart body 50. The width Wc may be, for example, 5 mm or more and 150 mm or less, depending on the maximum length La of the cart body 50.

[0035] The third wheel mounting frame 69 is provided at the other longitudinal end (the end on the positive side in the X direction) of the central frame 57. A fifth wheel 65 and a sixth wheel 66 are attached to both longitudinal ends (both ends in the Y direction) of the third wheel mounting frame 69, respectively.

[0036] As described above, the wheels 61 to 66 are composed of the first wheel 61, the second wheel 62, the third wheel 63, the fourth wheel 64, the fifth wheel 65, and the sixth wheel 66. Among these, the first wheel 61, the second wheel 62, the fifth wheel 65, and the sixth wheel 66 are free wheels, which rotate along horizontal axles and can be turned around a turning shaft extending in the vertical direction (Z direction). On the other hand, the third wheel 63 and the fourth wheel 64 are fixed wheels, which rotate along horizontal axles but cannot be turned around a vertical axis (Z direction).

[0037] In addition, when the transport dolly 10 is traveling with a load on it, the wheels 61 to 66 may be combined to ground the ground by combining two wheels, the central fixed wheel (the third wheel 63 and the fourth wheel 64) and either the front or rear free wheels (the first wheel 61 and the second wheel 62, or the fifth wheel 65 and the sixth wheel 66), so that the transport dolly 10 can travel stably and straight ahead. In addition, when no load is loaded on the transport dolly 10, in order to facilitate turning and nesting and to make it easier to maneuver, the central fixed wheel (the third wheel 63 and the fourth wheel 64) may not be grounded, and only the front and rear free wheels (the first wheel 61, the second wheel 62, the fifth wheel 65, and the sixth wheel 66) may be grounded. In addition, the dolly body 50 may have four wheels 61, 62, 65, and 66, and may not have the second wheel mounting frame 68.

[0038] A foldable bottom plate 58 is provided on the connecting member 53. The bottom plate 58 is substantially rectangular, extends between the first side frame 51 and the second side frame 52 in the longitudinal direction (X direction), and has substantially the same length as the first side frame 51 and the second side frame 52 in the lateral direction (Y direction). The bottom plate 58 has sufficient strength to support the load of the load of the transport cart 10, and the thickness Ta may be, for example, 1 cm or more and 20 cm or less, and preferably 3 cm or more and 15 cm or less.

[0039] The bottom plate 58 is movable relative to the connecting member 53, and can be in an unfolded state (see Figs. 2 and 4) in which it is disposed on the connecting member 53, and in a folded state (see Fig. 3) in which it is lifted up relative to the connecting member 53 and folded around the second side frame 52. That is, when the panels 11-16 are unfolded and assembled into a box-like unfolded state (see Figs. 2 and 4), the bottom plate 58 is disposed in a horizontal unfolded state. On the other hand, when the multiple panels 11-16 are folded up to assume the folded state (see Fig. 3), the bottom plate 58 is lifted vertically and disposed in a folded state.

[0040] As shown in FIG. 5, the bottom plate 58 can be rotated around a fulcrum 58a provided on the inside (negative side in the X direction) of the lower support portion 54. The fulcrum 58a is located below (negative side in the Z direction) the bottom panel 16 (described later). In this case, the entire connecting portion (fulcrum 58a) connecting the bottom plate 58 and the lower support portion 54 is located outside the panels 11 to 16. As a result, when the periphery is surrounded by a heat insulating material as described later, the connecting portion is not disposed across the storage space 20 (described later) and the outside air, and it is possible to prevent the connecting portion from becoming a heat bridge and reducing the heat insulating property of the storage space 20. In addition, there is no risk that the connecting portion (fulcrum 58a) will interfere with the panels 11 to 16 while the bottom plate 58 is moving between the folded state and the unfolded state.

[0041] (Panel configuration) Next, the configuration of the panels 11 to 16 will be described with reference to FIGS.

[0042] The panels 11 to 16 as a whole are arranged so as to be freely unfolded and folded relative to the trolley body 50, and as described above, can take an unfolded state (Figure 2) in which they are unfolded and assembled into a box shape, and a folded state (Figure 3) in which they can be nested.

[0043] FIG. 2 shows the panels 11 to 16 in an unfolded state. As shown in FIG. 2, the panels 11 to 16 have a substantially rectangular parallelepiped shape in an unfolded state, and include a top panel 11, a front panel 12, a rear panel 13, a first side panel 14, a second side panel 15, and a bottom panel 16. The top panel 11, the first side panel 14, the second side panel 15, the rear panel 13, the front panel 12, and the bottom panel 16 each have a substantially rectangular main surface (a pair of opposing surfaces that are the widest of the six surfaces constituting each panel). The main surfaces of the front panel 12 and the rear panel 13 have substantially the same size, and the main surfaces of the first side panel 14 and the second side panel 15 have substantially the same size. Each of the panels 11 to 16 is made of a plate-like member having rigidity, and is not flexibly deformed during use.

[0044] In the unfolded state, the six panels 11-16 surround the storage space 20 for storing the load. When the panels 11-16 are unfolded, the storage space 20 is formed between the panels 11-16 in a substantially rectangular parallelepiped shape. When the storage space 20 is surrounded by a heat insulating material as described later, the inflow and outflow of heat from the outside is restricted, and the heat insulating properties can be maintained. In addition, at least a part of the six panels 11-16 is provided so as to be movable relative to the other adjacent panels 11-16. This allows the transport cart 10 to change from the unfolded state in which the storage space 20 is formed to the folded state in which the storage space 20 is not formed, and from the folded state to the unfolded state. Therefore, when the transport cart 10 is not used, the panels 11-16 are folded to allow nesting with other transport carts 10. In addition, in the deployed state, the six panels 11 to 16 are each configured so that the periphery thereof is in close contact with any of the other panels 11 to 16, thereby ensuring that the storage space 20 is airtight.

[0045] As described below, each of the six panels 11-16 includes a heat insulating panel having a heat insulating portion 40 including a vacuum heat insulating material 41 (see FIG. 6). In the present embodiment, each of the six panels 11-16 includes a vacuum heat insulating material 41, but this is not limited thereto. Some or all of the panels 11-16 may include a heat insulating material such as a foam heat insulating material.

[0046] Next, a further description will be given of the configuration of each of the panels 11 to 16. In the following, "the panels 11 to 16 (partial panels) are parallel (perpendicular) to a predetermined surface" means "the main surfaces of the panels 11 to 16 (partial panels) are parallel (perpendicular) to the predetermined surface".

[0047] (Top panel) The top panel 11 is a panel located on the top side (positive side in the Z direction) in the unfolded state (FIG. 2) and is arranged parallel to the horizontal plane (XY plane). In the unfolded state, the top panel 11 is arranged above the first side frame 51 and the second side frame 52 of the dolly body 50, the first side panel 14, the second side panel 15, the rear panel 13, and the front panel 12.

[0048] This top panel 11 has a structure that can be partially opened and closed, and has a first top partial panel 11a located on the first side frame 51 side, a second top partial panel 11b located between the first side frame 51 and the second side frame 52, and a third top partial panel 11c located on the second side frame 52 side. Of these, the second top surface partial panel 11b is foldably attached to the third top surface partial panel 11c via a top surface hinge member 21a (see FIG. 14(b)). The second top surface partial panel 11b is detachably attached to the first top surface partial panel 11a via a hook-and-loop fastener (detachable member) 21b (see FIG. 14(b)). When the hook-and-loop fastener 21b is removed, the second top surface partial panel 11b is configured to be separated from the first top surface partial panel 11a.

[0049] In the unfolded state (FIG. 2), the first top surface partial panel 11a, the second top surface partial panel 11b, and the third top surface partial panel 11c are all arranged horizontally (parallel to the XY plane). On the other hand, in the folded state (FIG. 3), the first top surface partial panel 11a and the third top surface partial panel 11c continue to be arranged horizontally. In contrast, the second top surface partial panel 11b is folded downward by being removed from the first top surface partial panel 11a, and arranged so as to hang down from the third top surface partial panel 11c. At this time, the second top surface partial panel 11b is arranged around the inner periphery of the second side frame 52, on the inner side (negative side in the X direction) of the folded bottom plate 58, and is parallel to the YZ plane.

[0050] (Front Panel) The front panel 12 is a panel located on the front side (negative side in the Y direction) in the unfolded state (FIG. 2) and is disposed perpendicular to the horizontal plane (XY plane) (parallel to the ZX plane). In the unfolded state, the front panel 12 is disposed between the first side frame 51 and the second side frame 52 of the dolly body 50.

[0051] This front panel 12 has a foldable structure and has a first front partial panel 12a located on the first side frame 51 side, a second front partial panel 12b located approximately halfway between the first side frame 51 and the second side frame 52, and a third front partial panel 12c located on the second side frame 52 side. Of these, the first front partial panel 12a is foldably attached to the first side panel 14 via a first front hinge member 22a (see Fig. 9(a) and Fig. 10(a)-(c)). The second front partial panel 12b is foldably attached to the first front partial panel 12a via a second front hinge member 22b (see Fig. 9(a) and Fig. 10(a)-(c)). The third front partial panel 12c is foldably attached to the second front partial panel 12b via a third front hinge member 22c (see Fig. 9(a) and Fig. 10(a)-(c)). The third front partial panel 12c and the second side panel 15 are separate from each other, and may be detachably attached to each other, for example, via a hook-and-loop fastener (detachable member) not shown.

[0052] In the unfolded state (FIG. 2), the first front partial panel 12a, the second front partial panel 12b, and the third front partial panel 12c are all arranged perpendicular (parallel to the ZX plane) to the horizontal plane (XY plane). On the other hand, in the folded state (FIG. 3), the first front partial panel 12a, the second front partial panel 12b, and the third front partial panel 12c are folded like a folding screen so as to overlap each other, and are further rotated around the vertical axis (Z-axis) and arranged outside (X-direction minus side) of the first side panel 14. At this time, the first front partial panel 12a, the second front partial panel 12b, and the third front partial panel 12c are folded and arranged around the outside of the first side frame 51, and are parallel to the YZ plane.

[0053] In this way, by arranging the first front partial panel 12a, the second front partial panel 12b, and the third front partial panel 12c on the outer side of the first side frame 51, it is possible to secure a wide storage space 20 for storing loads. In addition, when the bottom plate 58 is lifted toward the second side frame 52, the first front partial panel 12a, the second front partial panel 12b, and the third front partial panel 12c are prevented from interfering with the bottom plate 58 during movement. The widths (lengths in the Y direction in the folded state) of the first front partial panel 12a, the second front partial panel 12b, and the third front partial panel 12c may be approximately the same as each other. In addition, the widths of the first front partial panel 12a, the second front partial panel 12b, and the third front partial panel 12c are approximately the same as the width (lengths in the Y direction) of the first side frame 51, or are longer than the width of the first side frame 51.

[0054] (Rear Panel) The rear panel 13 is a panel located on the rear side (positive side in the Y direction) in the unfolded state (FIG. 2) and is disposed perpendicular to the horizontal plane (XY plane) (parallel to the ZX plane). In the unfolded state, the rear panel 13 is disposed between the first side frame 51 and the second side frame 52 of the dolly body 50.

[0055] The rear panel 13 has a foldable structure, and includes a first rear partial panel 13a located on the first side frame 51 side and a second rear partial panel 13b located on the second side frame 52 side. The second rear partial panel 13b is foldably attached to the first rear partial panel 13a via a first rear hinge member 23a (see Figs. 15(a)-(c)). The first rear partial panel 13a is movably attached to the first side panel 14 via a second rear hinge member 23b (see Figs. 15(a)-(c)). However, this is not limited thereto, and the first rear partial panel 13a may be fixed to the first side panel 14 so as not to be foldable.

[0056] In the unfolded state (FIG. 2), the first rear partial panel 13a and the second rear partial panel 13b are both arranged perpendicular (parallel to the ZX plane) to the horizontal plane (XY plane). On the other hand, in the folded state (FIG. 3), the second rear partial panel 13b is folded so as to overlap the first rear partial panel 13a, and is arranged inside the first rear partial panel 13a (negative side in the Y direction). At this time, the first rear partial panel 13a remains on the rear side without being folded. That is, the first rear partial panel 13a is in the same position as in the unfolded state even in the folded state, and is arranged perpendicular (parallel to the ZX plane) to the horizontal plane (XY plane). Also, the first rear partial panel 13a and the second rear partial panel 13b are folded and arranged perpendicular to the first side frame 51, and are parallel to the ZX plane. In this way, in the folded state, the second rear partial panel 13b is removed, and the rear panel 13 is opened. The open portion of rear panel 13 has a predetermined width W1 in the horizontal direction (X direction) (FIG. 3). On the other hand, the portion where the first rear partial panel 13a and the second rear partial panel 13b overlap is covered without being opened, and has a predetermined width W2 in the horizontal direction (X direction) (FIG. 3). Depending on how the first rear partial panel 13a and the second rear partial panel 13b are folded, the entire rear panel 13 may be opened in the horizontal direction (X direction).

[0057] (First side panel) The first side panel 14 is a panel located on the first side frame 51 side (negative side in the X direction) in both the unfolded state (FIG. 2) and the folded state (FIG. 3), and is disposed perpendicular (parallel to the YZ plane) to the horizontal plane (XY plane). This first side panel 14 is composed of a single plate-shaped member. In both the unfolded state (FIG. 2) and the folded state (FIG. 3), the first side panel 14 is disposed around the outer periphery of the first side frame 51 of the dolly body 50 without moving, and is parallel to the YZ plane. The first side panel 14 is large enough to cover the entire outer side of the first side frame 51, and is fixed to the first side frame 51 by a connecting means (not shown).

[0058] (2nd side panel) The second side panel 15 is a panel located on the second side frame 52 side (the positive side in the X direction) in both the unfolded state (FIG. 2) and the folded state (FIG. 3), and is disposed perpendicular (parallel to the YZ plane) to the horizontal plane (XY plane). This second side panel 15 is composed of a single plate-shaped member. In both the unfolded state (FIG. 2) and the folded state (FIG. 3), the second side panel 15 is disposed around the outer periphery of the second side frame 52 of the dolly body 50 without moving, and is parallel to the YZ plane. The second side panel 15 is large enough to cover the entire outer side of the second side frame 52, and is fixed to the second side frame 52 by a connecting means (not shown).

[0059] (Bottom Panel) The bottom panel 16 is a panel located on the bottom side (negative Z-direction side) in the unfolded state (FIG. 2), and is arranged parallel to the horizontal plane (XY plane). In the unfolded state, the bottom panel 16 is arranged on the bottom plate 58 of the dolly body 50, between the first side frame 51 and the second side frame 52. The bottom panel 16 is composed of a single plate-like member, and has a structure that can be folded by lifting it up. The bottom panel 16 is foldably attached to the first side frame 51 via the bottom hinge member 26a (see FIG. 12(b)).

[0060] In the unfolded state (FIG. 2), the bottom panel 16 is disposed parallel to the horizontal plane (XY plane). On the other hand, in the folded state (FIG. 3), the bottom panel 16 is folded so as to overlap the inside of the first side frame 51 (the positive side in the X direction) and is positioned around the inside of the first side frame 51. That is, in the folded state, the bottom panel 16 is disposed perpendicular (parallel to the YZ plane) to the horizontal plane (XY plane). At this time, the bottom panel 16 is detachably attached to the first side frame 51 via, for example, a hook-and-loop fastener (detachable member) 26b (see FIG. 12(b)). In this case, the hook-and-loop fastener 26b makes it easy to attach the bottom panel 16 to the first side frame 51 and to detach the bottom panel 16 from the first side frame 51. In addition, because the hook-and-loop fastener 26b has a fixed area, it is possible to attach the bottom panel 16 to the first side frame 51 without precisely aligning the bottom panel 16 with respect to the first side frame 51. Furthermore, it is possible to absorb positional deviations and dimensional errors in the planar direction of the bottom panel 16, and it is also easy to fine-tune the attachment position of the bottom panel 16 to the first side frame 51.

[0061] The above-mentioned top hinge member 21a, first front hinge member 22a, second front hinge member 22b, third front hinge member 22c, first rear hinge member 23a, second rear hinge member 23b and bottom hinge member 26a may each be made of, for example, a foldable connecting cloth (connecting member). In this way, by making each of the hinge members 21a, 22a, 22b, 22c, 23a, 23a, 23b, 26a out of a connecting cloth, each panel (partial panel) can be easily unfolded or folded.

[0062] FIG. 3 shows the panels 11 to 16 in the folded state, as described above. As shown in FIG. 3, in the folded state, at least a portion of each of the panels 11 to 16 is folded around the periphery of the first side frame 51 or the second side frame 52, respectively.

[0063] That is, the third front partial panel 12c, the second front partial panel 12b, the first front partial panel 12a, the first side panel 14, and the bottom panel 16 overlap the periphery of the first side frame 51, in that order from the outside (the negative side in the X direction). The first side frame 51 is located between the first side panel 14 and the bottom panel 16. The second side frame 52 is also located around the second side frame 52, in that order from the outside (the positive side in the X direction), with the second side panel 15, the bottom plate 58, and the second top partial panel 11b overlapping. The second side frame 52 is located between the second side panel 15 and the bottom plate 58.

[0064] In this case, a first panel group G1 and a second panel group G2 are formed around the first side frame 51 and the second side frame 52, respectively. The first panel group G1 is composed of the third front partial panel 12c, the second front partial panel 12b, the first front partial panel 12a, the first side panel 14, the first side frame 51, and the bottom panel 16. The second panel group G2 is composed of the second side panel 15, the second side frame 52, the bottom plate 58, and the second top partial panel 11b. In this embodiment, the first panel group G1 (second panel group G2) includes not only all or a part of the panels 11 to 16, but also the first side frame 51 (second side frame 52) and the bottom plate 58.

[0065] In this embodiment, the greater of the total thickness T1 of the first panel group G1 and the total thickness T2 of the second panel group G2 is defined as T, and the number of transport carts 10 that can be nested is defined as n. In this case, the open width W1 of the back panel 13 described above is a length of (n-1)×T or more in the horizontal direction (X direction). For example, when the number of transport carts 10 that can be nested is three as described later, W1 is a length of 2T or more. In this way, by making the width W1 of the open part of the back panel 13 a length of (n-1)×T or more, it becomes possible to nest another transport cart 10 in the transport cart 10 through the open part of the back panel 13. On the other hand, as a comparative example, when the open width W1 of the back panel 13 is less than (n-1)×T, another transport cart 10 interferes with a part of the transport cart 10, and it becomes substantially difficult to nest n transport carts 10.

[0066] The thickness of each of the panels 11-16 is preferably, for example, 5 mm or more and 50 mm or less. In this embodiment, the panels 11-16 are described taking as an example a case where the thicknesses of the panels 11-16 are the same as each other, but the thicknesses of the panels 11-16 may be different from each other. The thickness (length in the X direction) of the first side frame 51 and the second side frame 52 is, for example, 10 mm or more and 50 mm or less. The total thickness T1 (T2) of the first panel group G1 (second panel group G2) refers to the distance between the outer surface of the outermost member and the inner surface of the innermost member among the panels 11-12, 14-16, the first side frame 51, the second side frame 52, and the bottom plate 58 included in the first panel group G1 (second panel group G2). In this case, it is preferable to make the sum of the total thickness T1 of the first panel group G1 and the total thickness T2 of the second panel group G2 as small as possible. By reducing the sum of the total thickness T1 and the total thickness T2, the number of transport carts 10 that can be nested can be increased.

[0067] Note that the distance Pa (Fig. 4) between the above-described first wheel mounting frame 67 and the second wheel mounting frame 68, and the distance Pb (Fig. 4) between the second wheel mounting frame 68 and the third wheel mounting frame 69 need to satisfy the relationships of "T × n < Pa" and "Wc × n < Pb". However, when the widths of the wheel mounting frames 67 and 69 are wider (larger) than T, it is necessary to satisfy the relationships of "width of the wheel mounting frames 67 and 69 × n < Pa" and "Wc × n < Pb".

[0068] (Internal Structure of the Panel) Next, the structures of the respective panels 11 to 16 will be described. Fig. 6 is a cross-sectional view showing the heat insulating portion 40 of each of the panels 11 to 16. Figs. 7(a) and 7(b) are cross-sectional views showing the vacuum heat insulating material 41 included in the heat insulating portion 40.

[0069] As shown in Fig. 6, the heat insulating portion 40 of each of the panels 11 to 16 has a vacuum heat insulating material 41, a foam heat insulating material 42, a heat insulating outer peripheral portion 43, a heat insulating material protection member 44, and a heat shielding sheet 45.

[0070] Among these, the vacuum heat insulating material 41 is attached to the foam heat insulating material 42. This vacuum heat insulating material 41 is composed of a core material 41a and an exterior material 41b provided around the core material 41a. The foam heat insulating material 42 is disposed on the side of the accommodation space 20 (the lower side in Fig. 6) of the vacuum heat insulating material 41. Thereby, the risk of the vacuum heat insulating material 41 being damaged when the load placed in the accommodation space 20 collides can be reduced.

[0071] The foam heat insulating material 42 can be disposed adjacent to at least the side of the vacuum heat insulating material 41 on the accommodation space 20 side. As the foam heat insulating material 42, a known foam heat insulating material can be used, and for example, a polyurethane foam may be used.

[0072] The heat-insulating outer periphery 43 is formed so as to surround the vacuum insulation material 41. This heat-insulating outer periphery 43 is disposed on the foam insulation material 42 and fixed to the foam insulation material 42. By disposing the heat-insulating outer periphery 43 so as to surround the vacuum insulation material 41, the heat-insulating performance is improved compared to the case where the heat-insulating outer periphery 43 is not disposed. In addition, a panel configuration is possible in which the vacuum insulation material 41 has approximately the same area as the foam insulation material 42 and does not use the heat-insulating outer periphery 43. In this case, the heat-insulating performance can be further improved, but since there is no heat-insulating outer periphery 43, there is a risk that the vacuum insulation material 41 may be vulnerable to breakage caused by a sharp object entering from the side. Note that a small gap is formed between the heat-insulating outer periphery 43 and the vacuum insulation material 41, so that the vacuum insulation material 41 can be accommodated in the heat-insulating outer periphery 43 even if the size of the vacuum insulation material 41 changes slightly.

[0073] The heat insulating material protection member 44 is provided on the heat insulating outer periphery 43, and mainly serves to protect the vacuum heat insulating material 41. As the heat insulating material protection member 44, for example, a protection material made of an organic polymer can be used.

[0074] The heat shielding sheet 45 is disposed so as to wrap the entire outer periphery of the vacuum insulation material 41, the foam insulation material 42, the thermal insulation outer surrounding portion 43, and the insulation material protection member 44. This heat shielding sheet 45 can be disposed so as to entirely cover the vacuum insulation material 41 and the foam insulation material 42. Examples of the heat shielding sheet 45 include a multilayer sheet including metal foil, and a vapor deposition sheet in which a vapor deposition layer is formed on one side of a resin sheet.

[0075] Next, the vacuum insulation material 41 will be further described. As shown in FIG. 7(a), the vacuum insulation material 41 is composed of a core material 41a and an exterior material 41b having gas barrier properties, and is an insulation material obtained by reducing the pressure inside the exterior material 41b. FIG. 7(b) shows another example of the vacuum insulation material 41. In FIG. 7(a), voids are formed at both ends inside the vacuum insulation material 41, but in FIG. 7(b), no voids are formed. The voids may or may not be formed depending on the manufacturing method of the vacuum insulation material 41.

[0076] The core material 41a may be made of a material that is used as the core material of conventionally known vacuum insulation materials, and may be, for example, a porous material such as a powder such as silica, a foam such as a urethane polymer, or a fibrous material such as glass wool.

[0077] The exterior material 41b is a member that covers the outer periphery of the core material 41a, and may be a flexible sheet in which a heat-sealed layer and a gas barrier layer are laminated in this order from the core material. The gas barrier layer may be a metal foil, a vapor deposition sheet in which a vapor deposition layer is formed on one side of a resin sheet, or the like. The metal foil may be made of aluminum, for example. The vapor deposition layer may be made of aluminum, aluminum oxide, or silicon oxide, for example.

[0078] (Disassembly and assembly of transport carts) Next, the operation of disassembling and assembling the transport cart 10 will be described.

[0079] (Disassembly of the transport cart) Figures 8 to 15 are diagrams for explaining each step in the order of disassembling the transport cart 10. Note that Figures 8(a), 9(a), 10(a)-(c), 11(a), 12(a), 13(a), 14(a), and 15(a)-(c) are plan views of the transport cart 10, and the top panel 11 is omitted. Also, Figures 8(b), 9(b), 11(b), 12(b), 13(b), and 14(b) are front views showing the transport cart 10.

[0080] First, as shown in Fig. 8(a) and (b), it is assumed that the six panels 11-16 of the transport cart 10 are unfolded and assembled into a box shape in an unfolded state. At this time, a storage space 20 having a substantially rectangular parallelepiped shape is formed between each panel 11-16. Although not shown, food or other cargo may be stored in the storage space 20.

[0081] Next, as shown in Figs. 9(a) and (b), the front panel 12 is folded, whereby the front panel 12 transitions from the unfolded state to the folded state.

[0082] During this time, as shown in Fig. 10(a), the first front partial panel 12a, the second front partial panel 12b, and the third front partial panel 12c are first folded in a folding screen shape. Specifically, the first front partial panel 12a rotates clockwise in a plan view relative to the first side panel 14 around the first front hinge member 22a. The second front partial panel 12b rotates counterclockwise in a plan view relative to the first front partial panel 12a around the second front hinge member 22b. Furthermore, the third front partial panel 12c rotates clockwise in a plan view relative to the second front partial panel 12b around the third front hinge member 22c.

[0083] Next, as shown in FIG. 10(b), the first front partial panel 12a, the second front partial panel 12b, and the third front partial panel 12c overlap each other, and in this state rotate clockwise in a planar view relative to the first side panel 14 around the first front hinge member 22a.

[0084] Thereafter, as shown in Fig. 10(c), the first front partial panel 12a, the second front partial panel 12b, and the third front partial panel 12c, which are overlapped with each other, move to the outer periphery of the first side frame 51. As a result, as shown in Figs. 11(a) and 11(b), the front panel 12 is folded, and the front side of the transport cart 10 is completely opened in the horizontal direction (X direction). If an object is stored in the storage space 20, the object may be removed from the front side in this state.

[0085] Next, as shown in Fig. 12(a)(b), the bottom panel 16 is folded, so that the bottom panel 16 changes from the unfolded state to the folded state. During this, the bottom panel 16 rotates counterclockwise in front view with respect to the first side frame 51 around the bottom hinge member 26a. As a result, the bottom panel 16 is folded so as to overlap the inside of the first side frame 51 (the positive side in the X direction) and is positioned around the inside of the first side frame 51. That is, the bottom panel 16 is disposed perpendicular to the horizontal plane (XY plane) (parallel to the YZ plane). In this case, the bottom panel 16 is attached to the first side frame 51 via the hook-and-loop fastener (detachable member) 26b.

[0086] 13(a) and (b), the bottom plate 58 is folded, so that the bottom plate 58 changes from the unfolded state to the folded state. During this time, the bottom plate 58 rotates clockwise in front view relative to the second side frame 52, is folded so as to overlap the inside of the second side frame 52 (the negative side in the X direction), and is positioned around the inside of the second side frame 52. That is, the bottom plate 58 is disposed perpendicular (parallel to the YZ plane) to the horizontal plane (XY plane). In this case, the bottom plate 58 is attached to the second side frame 52 by a fixing means (not shown).

[0087] 14(a)(b), the top panel 11 is folded, so that the top panel 11 changes from the unfolded state to the folded state. During this time, the hook-and-loop fastener 21b is removed, so that the second top partial panel 11b is separated from the first top partial panel 11a and rotates counterclockwise in front view relative to the third top partial panel 11c around the top hinge member 21a. As a result, the second top partial panel 11b is folded downward and arranged so as to hang down from the third top partial panel 11c. At this time, the second top partial panel 11b is arranged around the inner periphery of the second side frame 52 and on the inner side (negative side in the X direction) relative to the bottom plate 58.

[0088] Next, as shown in Figs. 15(a)-(c), the rear panel 13 is folded, so that the rear panel 13 changes from the unfolded state to the folded state.

[0089] During this time, first, as shown in Fig. 15(a)(b), the first rear partial panel 13a rotates counterclockwise in a plan view with respect to the first side panel 14 around the second rear hinge member 23b. Also, the second rear partial panel 13b rotates clockwise in a plan view with respect to the first rear partial panel 13a around the first rear hinge member 23a. As a result, the second rear partial panel 13b is folded so as to overlap the first rear partial panel 13a, and is disposed inside the first rear partial panel 13a (negative side in the Y direction). Furthermore, as shown in Fig. 15(c), the first rear partial panel 13a rotates clockwise in a plan view with respect to the first side panel 14 around the second rear hinge member 23b, and as a result, the first rear partial panel 13a is returned to the same position as in the unfolded state (Fig. 15(a)).

[0090] In this manner, by removing the second rear partial panel 13b, the rear panel 13 is opened by a predetermined width W1. On the other hand, the overlapping portion of the first rear partial panel 13a and the second rear partial panel 13b is covered without being opened.

[0091] In this manner, all of the six panels 11 to 16 of the transport cart 10 are folded up. At this time, a first panel group G1 and a second panel group G2 are formed around the first side frame 51 and the second side frame 52, respectively.

[0092] As described above, when the transport cart 10 is not in use, the panels 11 to 16 can be folded up to make the overall volume as small as possible for storage and transportation.

[0093] (Assembly of transport carts) The transportation cart 10 can be assembled by performing the above-described disassembly method in reverse order. That is, first, starting with the reverse operation of Figures 15(a), (b), and (c), the back panel 13 is changed from a folded state to an unfolded state. Next, as the reverse operation of Figures 14(a) and (b), the top panel 11 is changed from a folded state to an unfolded state, and then, as the reverse operation of Figures 13(a) and (b), the bottom plate 58 is changed from a folded state to an unfolded state. Next, as the reverse operation of Figures 12(a) and (b), the bottom panel 16 is changed from a folded state to an unfolded state, and finally, as the reverse operation of Figures 9 to 11, the front panel 12 is changed from a folded state to an unfolded state, thereby completing the assembly work.

[0094] (nesting of transport carts) Next, the operation when nesting the transport cart 10 will be described. Figures 16(a)-(c) are plan views explaining the operation when nesting the transport cart 10. Note that in Figures 16(a)-(c), the first top surface partial panel 11a and the third top surface partial panel 11c are omitted.

[0095] First, as shown in FIG. 16(a), a transportation cart 10 (first transportation cart 10) in which all six panels 11 to 16 are in a folded state is prepared.

[0096] Next, as shown in FIG. 16(b), another transport cart 10A (second transport cart 10A) in a folded state is prepared. This second transport cart 10A has the same configuration as the first transport cart 10. Next, the second transport cart 10A is brought close to the first transport cart 10 from the front side (negative side in the Y direction) of the first transport cart 10, and overlaps with the first transport cart 10. At this time, the first panel group G1 of the second transport cart 10A is brought as close as possible to the first panel group G1 of the first transport cart 10. In this case, since the rear panel 13 of the second transport cart 10A is opened by a predetermined width W1, the second panel group G2 of the first transport cart 10 does not interfere with the rear panel 13 of the second transport cart 10A.

[0097] Next, as shown in FIG. 16(c), another transport cart 10B (third transport cart 10B) in a folded state is prepared. This third transport cart 10B has the same configuration as the first transport cart 10 and the second transport cart 10A. Next, this third transport cart 10B is brought close to the second transport cart 10A from the front side (negative side in the Y direction) of the second transport cart 10A, and overlapped with the first transport cart 10 and the second transport cart 10A. At this time, the first panel group G1 of the third transport cart 10B is brought as close as possible to the first panel group G1 of the second transport cart 10A. In this case, the rear panel 13 of the third transport cart 10B is opened by a predetermined width W1, so that the second panel group G2 of the first transport cart 10 and the second panel group G2 of the second transport cart 10A do not interfere with the rear panel 13 of the third transport cart 10B.

[0098] As described above, the rear panel 13 of each of the transport dollies 10, 10A, and 10B is open by a width W1, and this width W1 is a length in the horizontal direction (X direction) of (n-1)×T or more. Here, as described above, T is the greater of the total thickness T1 of the first panel group G1 of each of the transport dollies 10, 10A, and 10B and the total thickness T2 of the second panel group G2, and n is the maximum number of transport dollies 10 that can be nested (3 in this case). In this way, by making the width W1 of the open part of the rear panel 13 of the transport dollies 10, 10A, and 10B (n-1)×T or more, it is possible to reliably nest n transport dollies 10, 10A, and 10B, and to store these transport dollies 10, 10A, and 10B compactly. The reason why such a relationship is established will be explained below.

[0099] 17(a) and (b) are plan views showing the nested transport carts 10, 10A, and 10B, and for convenience, only the rear panel 13, the first panel group G1, and the second panel group G2 of each transport cart 10, 10A, and 10B are shown. Also, it is assumed that each transport cart 10, 10A, and 10B is nested closely together along the X direction without any gaps. In addition, in FIG. 17(a) and (b), the first transport cart 10 is shown by a solid line, the second transport cart 10A is shown by a dashed line, and the third transport cart 10B is shown by a two-dot chain line.

[0100] FIG. 17(a) shows a case where the total thickness T1 of the first panel group G1 of each transport cart 10, 10A, 10B is greater than the total thickness T2 of the second panel group G2. That is, T1=T. The total length (length in the X direction) of each transport cart 10, 10A, 10B is La, and the width (length in the X direction) of the back panel 13 is W2. In this case, when the first transport cart 10 in FIG. 17(a) is focused on, the relationship La=T+W2+W1+T2 (Equation 1) holds (see the upper side of FIG. 17(a)). On the other hand, when the nested n (3) transport carts 10, 10A, 10B are focused on, the relationship La=n×T+W2+T2 (Equation 2) holds (see the lower side of FIG. 17(a)). From the above Equations 1 and 2, the relationship W1=(n-1)×T is obtained. Therefore, if W1 is equal to or greater than (n-1) x T, n transport carts 10, 10A, and 10B can be nested.

[0101] Fig. 17(b) shows a case where the total thickness T2 of the second panel group G2 of each transport cart 10, 10A, 10B is greater than the total thickness T1 of the first panel group G1. That is, T2 = T. In this case, when focusing on the third transport cart 10B in Fig. 17(b), the relationship La = T1 + W2 + W1 + T (Equation 3) holds (see the upper part of Fig. 17(b)). On the other hand, when focusing on the nested n (3) transport carts 10, 10A, 10B, the relationship La = T1 + W2 + n x T (Equation 4) holds (see the lower part of Fig. 17(b)). From the above formulas 3 and 4, the relationship W1 = (n-1) x T is obtained. Therefore, if W1 is equal to or greater than (n-1) x T, n transport carts 10, 10A, and 10B can be nested.

[0102] Thus, according to this embodiment, when the greater of the total thickness T1 of the first panel group G1 and the total thickness T2 of the second panel group G2 is T and the number of transport carts 10 that can be nested is n, the back panel 13 is opened horizontally by a width of (n-1)×T or more. This prevents other transport carts 10 from interfering with the back panel 13, and allows n transport carts 10 to be reliably nested. As a result, multiple transport carts 10 can be stored compactly when not in use.

[0103] Furthermore, according to this embodiment, the multiple panels 11-16 can be in an unfolded state in which they are unfolded and assembled into a box shape, and in a folded state in which they can be nested with other transport carts 10. As a result, by putting the panels 11-16 in the unfolded state, a storage space 20 capable of storing loads and having a high airtightness can be formed inside the panels 11-16. On the other hand, when the transport cart 10 is not in use, by putting the panels 11-16 in the folded state, these transport carts 10 can be nested with other identical transport carts 10 for compact storage.

[0104] Furthermore, according to this embodiment, at least a portion of each of the panels 11-16 is folded around the first side frame 51 or the second side frame 52, thereby forming a first panel group G1 including the first side frame 51 and a second panel group G2 including the second side frame 52. This makes it possible to easily fold the panels 11-16 and to arrange the multiple panels 11-16 compactly around the first side frame 51 and the second side frame 52.

[0105] According to this embodiment, in the folded state, the first rear partial panel 13a, which is a part of the rear panel 13, is not folded and remains on the rear side. This simplifies the work of folding the rear panel 13. Also, since the total thickness T1 of the first panel group G1 and the total thickness T2 of the second panel group G2 are prevented from becoming thicker than necessary by the amount of the rear partial panel 13a, the number of transport carts 10 that can be nested can be increased depending on the degree to which the thickness is reduced.

[0106] Furthermore, according to this embodiment, the dolly body 50 has six wheels 61-66, so that it is possible to carry a heavy load or a large load on the transport dolly 10. Furthermore, in such a long and slender six-wheeled transport dolly 10, the panels 11-16 can be selectively put into an unfolded state or a folded state.

[0107] According to this embodiment, each of the panels 11 to 16 includes a heat insulating panel, and the heat insulating panel includes a vacuum heat insulating material 41 or a foam heat insulating material. The vacuum heat insulating material 41 or the foam heat insulating material has good heat insulating performance even if it is thin, so that the heat insulating property of the storage space 20 in the panels 11 to 16 can be improved, and the load can be stored in a cool or warm state. Furthermore, by using the vacuum heat insulating material 41 or the foam heat insulating material, the weight of the panels 11 to 16 can be reduced, the storage volume of the transport cart 10 in the unfolded state can be increased, and the transport cart 10 in the folded state can be made compact. Furthermore, since the total thickness T1 of the first panel group G1 and the total thickness T2 of the second panel group G2 can be reduced, the number of transport carts 10 that can be nested can be increased depending on the degree of thinness.

[0108] Furthermore, according to this embodiment, the multiple panels 11-16 include a top panel 11, a front panel 12, a rear panel 13, a first side panel 14, a second side panel 15, and a bottom panel 16. As a result, the storage space 20 is covered from all directions by the panels 11-16, so that the items loaded in the storage space 20 can be protected from all directions.

[0109] According to this embodiment, the front panel 12 includes a plurality of foldable front partial panels 12a, 12b, 12c. Thus, by folding the front partial panels 12a, 12b, 12c, the front side of the transport cart 10 is opened, and it becomes easy to take out the load from the storage space 20 or store it in the storage space 20. Also, the front partial panels 12a, 12b, 12c can be compactly arranged around the outside of the first side frame 51. In this case, the length of the front partial panels 12a, 12b, 12c in the width direction (Y direction in the folded state) is reduced, and the front partial panels 12a, 12b, 12c are prevented from interfering with objects around the passage when the transport cart 10 passes through a narrow passage.

[0110] Furthermore, according to this embodiment, the cart body 50 further has a foldable bottom plate 58, which is folded around the second side frame 52 to form the second panel group G2. As a result, in the unfolded state, the weight of the load can be supported by the bottom plate 58, and in the folded state, the bottom plate 58 can be lifted and positioned around the second side frame 52 to put the transport cart 10 in a nestable state.

[0111] (Modification) Next, various modified examples of the transport cart will be described.

[0112] In the above embodiment, the case where the top panel 11 is composed of three top partial panels 11a, 11b, and 11c, the front panel 12 is composed of three front partial panels 12a, 12b, and 12c, and the rear panel 13 is composed of two rear partial panels 13a and 13b has been described as an example. However, this is not limited to the above, and for example, when each panel 11 to 13 is removable, the top panel 11, the front panel 12, and the rear panel 13 may be composed of a single panel. Alternatively, each panel 11 to 13 may be composed of a plurality of partial panels different from the above. In the above embodiment, the case where the first side panel 14, the second side panel 15, and the bottom panel 16 are each composed of a single panel has been described as an example, but the first side panel 14, the second side panel 15, and the bottom panel 16 may be composed of a plurality of partial panels.

[0113] In the above embodiment, the first panel group G1 is composed of the third front partial panel 12c, the second front partial panel 12b, the first front partial panel 12a, the first side panel 14, the first side frame 51, and the bottom panel 16, and the second panel group G2 is composed of the second side panel 15, the second side frame 52, the bottom plate 58, and the second top partial panel 11b. However, each panel or partial panel may belong to either the first panel group G1 or the second panel group G2. In addition, the bottom plate 58 is folded around the second side frame 52 to form the second panel group G2, but the present invention is not limited to this. The bottom plate 58 may be folded around the first side frame 51 to form the first panel group G1.

[0114] Also, in the above embodiment, a case has been described as an example in which all of the panels 11-16 are not separated from the dolly body 50 in the folded state. However, this is not limiting, and some of the panels 11-16 may be detached and separated from the dolly body 50 in the folded state. For example, in the folded state, all or part of the top panel 11 may be detached and stored in a location separate from the transportation dolly 10. In this case, the total thickness T1 of the first panel group G1 and the total thickness T2 of the second panel group G2 can be made thinner.

[0115] In the above embodiment, the six panels 11-16 include heat-insulating panels, but the present invention is not limited to this, and the panels 11-16 do not necessarily have to have heat-insulating properties. For example, by forming each of the panels 11-16 from a transparent or opaque thin plate, it is possible to prevent the load contained in the storage space 20 from falling. Furthermore, by forming each of the panels 11-16 from an opaque thin plate, it is possible to conceal the load contained in the storage space 20 so that it cannot be seen from the outside.

[0116] In the above embodiment, the case where the front panel 12 is completely opened in the horizontal direction (X direction) in the folded state has been described as an example. However, this is not limiting, and a part of the front panel 12 may remain on the front side (negative side in the Y direction) without being folded, as long as it does not interfere with nesting the transport cart 10. In this case, the total thickness T1 of the first panel group G1 and the total thickness T2 of the second panel group G2 can be made thinner.

[0117] In the above embodiment, the case where the bottom panel 16 is provided has been described as an example, but the present invention is not limited to this, and the bottom panel 16 may not be provided. In this case, the storage space 20 may be formed by the top panel 11, the front panel 12, the back panel 13, the first side panel 14, the second side panel 15, and the bottom plate 58. Also, without providing the bottom panel 16, the bottom plate 58 may be provided with heat insulation, for example, by spraying a heat insulating material onto the bottom plate 58. In this case, the operation of moving the bottom panel 16 is not required, and the workability of folding and unfolding the panels 11 to 15 is improved. Also, the total thickness T1 of the first panel group G1 and the total thickness T2 of the second panel group G2 can be reduced.

[0118] In the above embodiment, the first front partial panel 12a, the second front partial panel 12b, and the third front partial panel 12c of the front panel 12 are disposed outside the first side frame 51. However, this is not limited to this, and as shown in FIG. 18, the first front partial panel 12a, the second front partial panel 12b, and the third front partial panel 12c of the front panel 12 may be disposed inside the first side frame 51. In this case, the front panel 12 further has a fourth front partial panel 12d fixed to the first side panel 14 or the first side frame 51. The first front partial panel 12a is attached to the fourth front partial panel 12d so as to be freely foldable. In FIG. 18, the first top surface partial panel 11a and the third top surface partial panel 11c are omitted.

[0119] Also, as shown in FIG. 19, a removable middle shelf 59 may be provided on the first side frame 51 and the second side frame 52 of the dolly body 50. This middle shelf 59 has a rectangular shape in a plan view and extends along the longitudinal direction (X direction) of the connecting member 53. By providing such a middle shelf 59, it is possible to arrange and arrange the load inside the storage space 20. This middle shelf 59 is detachably attached to the horizontal rail 56 of the first side frame 51 and the horizontal rail 56 of the second side frame 52. That is, in the unfolded state, the middle shelf 59 is disposed between the first side frame 51 and the second side frame 52. On the other hand, in the folded state, the middle shelf 59 is removed from the first side frame 51 and the second side frame 52 and stored separately from the dolly body 50. In this case, the middle shelf 59 can be attached to any horizontal rail 56 among the multiple horizontal rails 56 provided in the height direction (Z direction). However, the present invention is not limited to this, and the intermediate shelf 59 may be separable, for example, in a part of its longitudinal direction (X direction). In this case, in the folded state, the part of the pair of separated intermediate shelves 59 may be folded around the inner sides of the first side frame 51 and the second side frame 52. The number of intermediate shelves 59 is not limited to one, and multiple intermediate shelves 59 may be provided.

[0120] (Second embodiment) Next, a second embodiment will be described with reference to Figs. 20 to 35. Figs. 20 to 35 are diagrams showing the second embodiment. The second embodiment shown in Figs. 20 to 35 differs mainly in the configuration of each panel 11 to 16, and other configurations are substantially the same as those of the first embodiment described above. In Figs. 20 to 35, the same parts as those shown in Figs. 1 to 19 are given the same reference numerals and detailed description is omitted. In the following, differences from the first embodiment will be mainly described.

[0121] 20 to 22, the transport cart 10 according to this embodiment includes a cart body 50 and a plurality of panels 11-16 (six panels 11-16) that are provided so as to be able to be unfolded and folded with respect to the cart body 50. Of these, the configuration of the cart body 50 is substantially the same as that of the first embodiment.

[0122] (Panel configuration) Next, the configuration of the panels 11 to 16 will be described. The panels 11 to 16 are provided as a whole so as to be freely unfoldable and foldable with respect to the dolly body 50, and can be in an unfolded state (FIG. 20) where they are unfolded and assembled into a box shape, and in a folded state (FIG. 22) where they can be nested. Also, FIG. 21 shows the case where only the front panel 12 of the panels 11 to 16 is in the folded state.

[0123] 20, the panels 11-16 include a top panel 11, a front panel 12, a rear panel 13, a first side panel 14, a second side panel 15, and a bottom panel 16. In the unfolded state, the six panels 11-16 surround a storage space 20 for storing cargo.

[0124] Next, the configuration of each of the panels 11 to 16 will be further described.

[0125] (Top panel) In the unfolded state (FIG. 20), the top panel 11 is disposed above the first side frame 51, the second side frame 52, the first side panel 14, and the front panel 12. The top panel 11 is disposed closer to the front (negative side in the Y direction) than the rear panel 13, and closer to the first side surface (negative side in the X direction) than the second side panel 15.

[0126] The top panel 11 has a structure that can be partially opened and closed, and has a first top partial panel 11a located on the first side frame 51 side, and a second top partial panel 11b located on the second side frame 52 side and larger than the first top partial panel 11a. Of these, the first top partial panel 11a is foldably attached to the first side panel 14 via a first top hinge member 21c (see Figs. 24(a)-(c)). The second top partial panel 11b is foldably attached to the first top partial panel 11a via a second top hinge member 21d (see Figs. 24(a)-(c)). Furthermore, the second top partial panel 11b is detachably attached to the second side panel 15 via a hook-and-loop fastener (detachable member) not shown.

[0127] In the unfolded state (FIG. 20), the first top surface partial panel 11a and the second top surface partial panel 11b are both arranged horizontally (parallel to the XY plane). In the folded state (FIG. 22), the first top surface partial panel 11a is arranged horizontally, while the second top surface partial panel 11b is folded downward and arranged to hang down from the first top surface partial panel 11a. At this time, the second top surface partial panel 11b is arranged around the inner periphery of the first side frame 51 and is parallel to the YZ plane.

[0128] (Front Panel) In the unfolded state (Figure 20), the front panel 12 is a panel that is located below the top panel 11 and above the bottom panel 16, and is located closer to the front (negative side in the Y direction) than the rear panel 13, and is arranged perpendicular to the horizontal plane (XY plane) (parallel to the ZX plane).

[0129] The front panel 12 has a foldable structure, and includes a first front partial panel 12a located on the first side frame 51 side, a second front partial panel 12b located in the middle, and a third front partial panel 12c located on the second side frame 52 side. Among these, the first front partial panel 12a is foldably attached to the first side panel 14 via a first front hinge member 22a (see Fig. 23(a)-(c)). The second front partial panel 12b is foldably attached to the first front partial panel 12a via a second front hinge member 22b (see Fig. 23(a)-(c)). Furthermore, the third front partial panel 12c is foldably attached to the second front partial panel 12b via a third front hinge member 22c (see Fig. 23(a)-(c)). The third front partial panel 12c is detachably attached to the second side panel 15 via, for example, a hook-and-loop fastener (detachable member) not shown.

[0130] In the unfolded state (FIG. 20), the first front partial panel 12a, the second front partial panel 12b, and the third front partial panel 12c are all arranged perpendicular to the horizontal plane (XY plane) (parallel to the ZX plane). The width (length in the X direction) of the first front partial panel 12a is shorter than the width (length in the X direction) of the second front partial panel 12b and the third front partial panel 12c, and the width (length in the X direction) of the second front partial panel 12b is approximately the same as the width (length in the X direction) of the third front partial panel 12c. On the other hand, in the folded state (FIG. 22), the first front partial panel 12a is located on the front side (negative side in the Y direction) of the first side panel 14. The second front partial panel 12b and the third front partial panel 12c are folded so as to overlap each other, and are further rotated around the vertical axis (axis in the Z direction) to be arranged on the outside (negative side in the X direction) of the first side panel 14. At this time, the second front partial panel 12b and the third front partial panel 12c are folded over and arranged around the outer periphery of the first side frame 51, and are parallel to the YZ plane.

[0131] (Rear Panel) In the unfolded state (Figure 20), the rear panel 13 is a panel that is located toward the rear (positive side in the Y direction) than the top panel 11, front panel 12, first side panel 14, second side panel 15, and bottom panel 16, and is arranged perpendicular (parallel to the ZX plane) to the horizontal plane (XY plane).

[0132] The rear panel 13 has a foldable structure, and includes a first rear partial panel 13a located on the first side frame 51 side, and a second rear partial panel 13b located on the second side frame 52 side. Of these, the second rear partial panel 13b is foldably attached to the first rear partial panel 13a via a first rear hinge member 23a (see Figs. 25(a)-(c)). The second rear partial panel 13b is detachably attached to the second side panel 15 via, for example, a hook-and-loop fastener (detachable member) not shown. Furthermore, the first rear partial panel 13a is fixed to the first side panel 14.

[0133] In the unfolded state (FIG. 20), the first rear partial panel 13a and the second rear partial panel 13b are both disposed perpendicular (parallel to the ZX plane) to the horizontal plane (XY plane). On the other hand, in the folded state (FIG. 22), the second rear partial panel 13b is folded so as to overlap the first rear partial panel 13a, and is disposed outward (positive side in the Y direction) from the first rear partial panel 13a. At this time, the first rear partial panel 13a remains on the rear side without being folded. That is, even in the folded state, the first rear partial panel 13a is in the same position as in the unfolded state, and is disposed perpendicular (parallel to the ZX plane) to the horizontal plane (XY plane). Additionally, the first rear partial panel 13a and the second rear partial panel 13b are folded and disposed perpendicular to the first side frame 51 and parallel to the ZX plane. In this manner, in the folded state, the second rear partial panel 13b is removed, thereby opening the rear panel 13. The opened portion of the rear panel 13 has a predetermined width W1 in the horizontal direction (X direction) (FIG. 22).

[0134] (First side panel) The first side panel 14 is a panel located on the first side frame 51 side (the negative side in the X direction) in both the unfolded state (FIG. 20) and the folded state (FIG. 22), and is disposed perpendicular to the horizontal plane (XY plane) (parallel to the YZ plane). The configuration of this first side panel 14 is substantially the same as in the first embodiment.

[0135] (2nd side panel) The second side panel 15 is a panel located on the second side frame 52 side (the positive side in the X direction) in both the unfolded state (FIG. 20) and the folded state (FIG. 22), and is disposed perpendicular to the horizontal plane (XY plane) (parallel to the YZ plane). The configuration of this second side panel 15 is substantially the same as that of the first embodiment.

[0136] (Bottom Panel) The bottom panel 16 is a panel located on the bottom side (negative Z-direction side) in the unfolded state (FIG. 20), and is disposed parallel to the horizontal plane (XY plane). In the unfolded state, the bottom panel 16 is disposed on the bottom plate 58 of the dolly body 50, between the first side frame 51 and the second side frame 52. The configuration of this bottom panel 16 is substantially the same as that in the first embodiment.

[0137] 21, a rectangular gap panel 17 is provided around the bottom (negative side in the Z direction) of each of the first side frame 51 and the second side frame 52. This gap panel 17 closes the gap between the bottom panel 16 and the first side panel 14 or the second side panel 15, thereby further improving the thermal insulation of the storage space 20.

[0138] Fig. 22 shows the panels 11 to 16 in a folded state. As shown in Fig. 22, in the folded state, at least a portion of each of the panels 11 to 16 is folded around the periphery of the first side frame 51 or the second side frame 52, respectively.

[0139] That is, the second front partial panel 12b, the third front partial panel 12c, the first side panel 14, the bottom panel 16, and the second top partial panel 11b overlap the periphery of the first side frame 51, in that order from the outside (the negative side in the X direction). The first side frame 51 is located between the first side panel 14 and the bottom panel 16. The second side frame 52 is also located around the second side frame 52, in that order from the outside (the positive side in the X direction), with the second side panel 15 and the bottom plate 58 overlapping. The second side frame 52 is located between the second side panel 15 and the bottom plate 58.

[0140] In this case, a first panel group G1 and a second panel group G2 are formed around the first side frame 51 and the second side frame 52, respectively. The first panel group G1 is composed of the second front partial panel 12b, the third front partial panel 12c, the first side panel 14, the first side frame 51, the bottom panel 16, and the second top partial panel 11b. The second panel group G2 is composed of the second side panel 15, the second side frame 52, and the bottom plate 58.

[0141] As in the first embodiment, the greater of the total thickness T1 of the first panel group G1 and the total thickness T2 of the second panel group G2 is defined as T, and the number of transport carts 10 that can be nested is defined as n. In this case, the open width W1 of the above-mentioned rear panel 13 is equal to or greater than (n-1)×T in the horizontal direction (X direction).

[0142] (Disassembly of the transport cart) Next, there will be described the operation when disassembling the transport cart 10. Figures 23 to 25 are diagrams for explaining some of the steps for disassembling the transport cart 10 in order.

[0143] First, assume that the six panels 11-16 of the transport cart 10 are unfolded and assembled into a box shape (unfolded state) as shown in Fig. 20. At this time, a storage space 20 having a substantially rectangular parallelepiped shape is formed between each of the panels 11-16.

[0144] Next, as shown in FIG. 21, the front panel 12 is folded, whereby the front panel 12 transitions from the unfolded state to the folded state.

[0145] During this, first, as shown in Fig. 23(a), the third front partial panel 12c is folded so as to overlap the second front partial panel 12b. Specifically, the third front partial panel 12c rotates clockwise in a plan view with respect to the second front partial panel 12b around the third front hinge member 22c.

[0146] Next, as shown in FIG. 23(b), the second front partial panel 12b and the third front partial panel 12c overlap each other and, in this state, rotate clockwise in a plan view relative to the first front partial panel 12a around the second front hinge member 22b.

[0147] Thereafter, as shown in FIG. 23(c), the second front partial panel 12b and the third front partial panel 12c move to the outer periphery of the first side frame 51. Specifically, the first front partial panel 12a rotates clockwise in a plan view with respect to the first side panel 14 about the first front hinge member 22a. At this time, the first front partial panel 12a is positioned on the front side (negative side in the Y direction) with respect to the first side panel 14, and the second front partial panel 12b and the third front partial panel 12c are positioned on the outer side (negative side in the X direction) with respect to the first side frame 51. In this way, as shown in FIG. 21, the front panel 12 is folded, and the front side of the transport cart 10 is completely opened in the horizontal direction (X direction).

[0148] Next, in the same manner as in the first embodiment, the bottom panel 16 is folded, so that the bottom panel 16 changes from the unfolded state to the folded state. During this time, the bottom panel 16 rotates counterclockwise relative to the first side frame 51 when viewed from the front. As a result, the bottom panel 16 is positioned around the inner periphery of the first side frame 51.

[0149] Next, in the same manner as in the first embodiment, the bottom plate 58 is folded, so that the bottom plate 58 changes from the unfolded state to the folded state. During this process, the bottom plate 58 rotates clockwise relative to the second side frame 52 in a front view, and is folded so as to overlap the inside of the second side frame 52 (the negative side in the X direction), and is positioned around the inside of the second side frame 52.

[0150] Next, as shown in Figs. 24(a)-(c), the top panel 11 is folded, so that the top panel 11 changes from the unfolded state to the folded state.

[0151] During this time, first, as shown in Figures 24(a) and (b), the first top surface partial panel 11a rotates counterclockwise in a front view relative to the first side panel 14 around the first top surface hinge member 21c, and the second top surface partial panel 11b rotates clockwise in a front view relative to the first top surface partial panel 11a around the second top surface hinge member 21d.

[0152] 24(c), the second top surface partial panel 11b moves to the inner periphery of the first side frame 51. Specifically, the first top surface partial panel 11a rotates clockwise in a front view relative to the first side panel 14 around the first top surface hinge member 21c, and the second top surface partial panel 11b rotates clockwise in a front view relative to the first top surface partial panel 11a around the second top surface hinge member 21d. As a result, the second top surface partial panel 11b is folded downward and arranged so as to hang down from the first top surface partial panel 11a. At this time, the second top surface partial panel 11b is arranged around the inner periphery of the first side frame 51 and on the inside (positive side in the X direction) relative to the bottom panel 16.

[0153] Next, as shown in Figs. 25(a) and (b), the rear panel 13 is folded, so that the rear panel 13 changes from the unfolded state to the folded state.

[0154] During this, first, as shown in Figures 25(a) and 25(b), the second rear partial panel 13b rotates counterclockwise in a plan view with respect to the first rear partial panel 13a around the first rear hinge member 23a. As a result, the second rear partial panel 13b is folded so as to overlap the first rear partial panel 13a, and is disposed outside the first rear partial panel 13a (the positive side in the Y direction). Meanwhile, the first rear partial panel 13a maintains the same position in the folded state as in the unfolded state.

[0155] In this manner, all of the six panels 11 to 16 of the transport cart 10 are folded, and a first panel group G1 and a second panel group G2 are formed around the first side frame 51 and the second side frame 52, respectively.

[0156] (Assembly of transport carts) The transportation cart 10 can be assembled by performing the above-described disassembly method in reverse order. That is, first, starting with the reverse operation of Figures 25(a) and (b), the back panel 13 is changed from the folded state to the unfolded state. Next, as the reverse operation of Figures 24(a)-(c), the top panel 11 is changed from the folded state to the unfolded state. Next, the bottom plate 58 and the bottom panel 16 are changed from the folded state to the unfolded state, and finally, as the reverse operation of Figures 23(a)-(c), the front panel 12 is changed from the folded state to the unfolded state, thereby completing the assembly work.

[0157] In this embodiment, the bottom panel 16 is described as being made of a single plate-shaped member, but this is not limited thereto, and the bottom panel 16 may be made up of multiple (two) partial bottom panels.

[0158] For example, as shown in Fig. 26(a)-(c), the bottom panel 16 has a first bottom partial panel 16a located on the first side frame 51 side and a second bottom partial panel 16b located on the second side frame 52 side. The first bottom partial panel 16a is foldably attached to the first side panel 14 via a first bottom hinge member 26c made of, for example, a drapery cloth. The second bottom partial panel 16b is foldably attached to the first bottom partial panel 16a via a second bottom hinge member 26d. The second bottom partial panel 16b is detachably attached to the second side panel 15 via a hook-and-loop fastener (detachable member) not shown.

[0159] In the unfolded state, the first bottom partial panel 16a and the second bottom partial panel 16b are both arranged horizontally (parallel to the XY plane). In the folded state, the second bottom partial panel 16b is folded so as to overlap the first bottom partial panel 16a. At this time, the first bottom partial panel 16a and the second bottom partial panel 16b are arranged around the inner periphery of the first side frame 51 and are parallel to the YZ plane.

[0160] When folding the bottom panel 16, first, as shown in Figures 26(a) and 26(b), the first bottom partial panel 16a rotates counterclockwise in a front view relative to the first side panel 14 about the first bottom hinge member 26c. Also, the second bottom partial panel 16b rotates clockwise in a front view relative to the first bottom partial panel 16a about the second bottom hinge member 26d. Then, as shown in Figure 26(c), the first bottom partial panel 16a and the second bottom partial panel 16b are arranged around the inside of the first side frame 51 in an overlapping state.

[0161] In this embodiment, the panels 11 to 14, 16, and 17 are detachably attached to the other panels. Specifically, the front panel 12 and the first side panel 14 are detachably attached to each other, and the back panel 13 and the first side panel 14 are detachably attached to each other. In addition, the top panel 11 and the first side panel 14 are detachably attached to each other. Furthermore, the bottom panel 16 and the gap panel 17 are detachably attached to each other.

[0162] Hereinafter, a configuration for detachably mounting the panels 11 to 14, 16, and 17 will be described with reference to FIGS.

[0163] 27(a), the first front partial panel 12a of the front panel 12 is provided with a convex sandwiched portion 28a that protrudes toward the first side panel 14. The first side panel 14 is also provided with a concave sandwiching portion 29a that sandwiches the sandwiched portion 28a. The front panel 12 is attached to the first side panel 14 by sandwiching the sandwiched portion 28a into the sandwiching portion 29a. Meanwhile, the front panel 12 is removed from the first side panel 14 by pulling the sandwiched portion 28a away from the sandwiching portion 29a. In this manner, the front panel 12 and the first side panel 14 are removably attached to each other.

[0164] 27(b), when the front panel 12 transitions from the unfolded state to the folded state, the first front partial panel 12a rotates clockwise in a plan view relative to the first side panel 14. Even in this case, the sandwiched portion 28a provided on the first front partial panel 12a is securely sandwiched between the sandwiching portion 29a provided on the first side panel 14, so the first front partial panel 12a will not come off the first side panel 14.

[0165] FIG. 28(a) is an enlarged view of the attachment portion between the first front partial panel 12a and the first side panel 14. As shown in FIG. 28(a), the sandwiched portion 28a provided on the first front partial panel 12a has a hook portion 31a of a hook-and-loop fastener. The sandwiched portion 29a provided on the first side panel 14 has a loop portion 31b of a hook-and-loop fastener. The hook portion 31a of the sandwiched portion 28a and the loop portion 31b of the sandwiched portion 29a are attached and detached to each other, so that the first front partial panel 12a and the first side panel 14 are detachably attached to each other. In addition, the loop portion 31b of the hook-and-loop fastener is provided in the area A1 of the first front partial panel 12a on the first side panel 14 side, and the sandwiched portion 28a is detachably attached to the first front partial panel 12a in this area A1. This allows the first front partial panel 12a to be smoothly rotated and moved toward the front side (negative side in the Y direction) further than the first side panel 14 when the front panel 12 transitions from an unfolded state to a folded state (see Figure 27(b)).

[0166] 28(b), the clamping portion 29a has a loop portion 31b of a hook-and-loop fastener. Therefore, when the front panel 12 is removed, the loop portions 31b of the clamping portion 29a do not adhere to each other, and the clamping portion 29a does not become blocked. However, this is not limited to the above, and the clamped portion 28a may have the loop portion 31b of a hook-and-loop fastener.

[0167] As shown in FIG. 29, a sandwiched portion 28a may be provided on the first side panel 14, and a sandwiching portion 29a that sandwiches the sandwiched portion 28a may be provided on the first front partial panel 12a.

[0168] As shown in Fig. 30, the first side panel 14 is provided with a convex sandwiched portion 28b that protrudes towards the rear panel 13. Also, the first rear partial panel 13a of the rear panel 13 is provided with a concave sandwiching portion 29b that sandwiches the sandwiched portion 28b. The first side panel 14 is attached to the rear panel 13 by sandwiching the sandwiched portion 28b into the sandwiching portion 29b. On the other hand, the first side panel 14 is removed from the rear panel 13 by pulling the sandwiched portion 28b away from the sandwiching portion 29b. In this manner, the rear panel 1 and the first side panel 14 are detachably attached to each other.

[0169] In this case, the clamping portion 29b has a loop portion of the hook-and-loop fastener, and the clamped portion 28b has a hook-and-loop fastener hook portion. However, this is not limited thereto, and the clamping portion 29b may have a hook portion, and the clamped portion 28b may have a loop portion. Also, the clamping portion 29b may be provided on the first side panel 14, and the clamped portion 28b may be provided on the first rear partial panel 13a.

[0170] As shown in FIG. 31, the first side panel 14 is provided with a convex sandwiched portion 28c that protrudes toward the top panel 11. Also, the first top partial panel 11a of the top panel 11 is provided with a concave sandwiching portion 29c that sandwiches the sandwiched portion 28c. The first side panel 14 is attached to the top panel 11 by sandwiching the sandwiched portion 28c into the sandwiching portion 29c. Meanwhile, the first side panel 14 is removed from the top panel 11 by pulling the sandwiched portion 28c away from the sandwiching portion 29c. In this manner, the top panel 11 and the first side panel 14 are detachably attached to each other.

[0171] In this case, the clamping portion 29c has a loop portion of a hook-and-loop fastener, and the clamped portion 28c has a hook portion of a hook-and-loop fastener. However, this is not limited thereto, and the clamping portion 29c may have a hook portion, and the clamped portion 28c may have a loop portion. Also, the clamping portion 29c may be provided on the first side panel 14, and the clamped portion 28c may be provided on the first top partial panel 11a.

[0172] 32, the bottom panel 16 is provided with a convex sandwiched portion 28d that protrudes toward the gap panel 17. In addition, the gap panel 17 is provided with a concave sandwiching portion 29d that sandwiches the sandwiched portion 28d. The bottom panel 16 is attached to the gap panel 17 by sandwiching the sandwiched portion 28d into the sandwiching portion 29d. Meanwhile, the bottom panel 16 is removed from the gap panel 17 by pulling the sandwiched portion 28d away from the sandwiching portion 29d.

[0173] In this case, the sandwiching portion 29d has a loop portion of the hook-and-loop fastener, and the sandwiched portion 28d has a hook portion of the hook-and-loop fastener. However, this is not limited to the above, and the sandwiching portion 29d may have a hook portion, and the sandwiched portion 28d may have a loop portion. In addition, the sandwiching portion 29d may be provided on the bottom panel 16, and the sandwiched portion 28d may be provided on the gap panel 17.

[0174] 33(a) and (b) show cross-sectional configurations of the panels 11 to 14, 16, and 17 shown in FIGS.

[0175] As shown in Fig. 33(a) and (b), the panels 11 to 14, 16, and 17 have a panel center portion 46 and a heat shielding sheet 45 that wraps the panel center portion 46. The panel center portion 46 includes a vacuum insulation material 41, a foam insulation material 42, a heat-insulating outer periphery portion 43, and a heat insulation material protection member 44 (see Fig. 6). As shown in Fig. 33(a), the sandwiched portions 28a to 28d are formed in a convex shape by protruding a part of the heat shielding sheet 45 that protrudes from the panel center portion 46. As shown in Fig. 33(b), the sandwiched portions 29a to 29d are formed in a concave shape by folding a part of the heat shielding sheet 45 that protrudes from the panel center portion 46.

[0176] In this way, by attaching the panels 11-14, 16, and 17 detachably to each other, it is possible not only to use the transport dolly 10 including the panels 11-17, but also to use the dolly body 50 alone with the panels 11-17 removed. Furthermore, for example, when the dolly body 50 and the panels 11-17 are manufactured in different locations, the transport dolly body 50 and the panels 11-17 can be transported and the transport dolly 10 can be assembled efficiently. Furthermore, when the transport dolly 10 is not used and is stored for a long period of time, the panels 11-17 can be removed from the dolly body 50.

[0177] In this embodiment, all of the panels 11-17 do not necessarily have to be detachably attached to the other panels 11-17 or the cart body 50, and some of the panels 11-17 may be attached so as not to be detachable from the other panels 11-17 or the cart body 50. Also, in the above-mentioned first embodiment, all or some of the multiple panels 11-16 may be detachably attached to each other, similarly to the embodiment shown in Figures 27 to 33.

[0178] A modified example of this embodiment will be described below with reference to Figures 34 and 35. Figure 34(a) shows the state before the panels 13, 14 are attached to the first side frame 51, and Figure 34(b) shows the state after the panels 13, 14 are attached to the first side frame 51. Also, Figure 35(a) shows the state before the panels 11, 14 are attached to the first side frame 51, and Figure 35(b) shows the state after the panels 11, 14 are attached to the first side frame 51.

[0179] As shown in FIG. 34(a), the first rear partial panel 13a of the rear panel 13 has a first swinging piece 71a and a second swinging piece 71b. The first swinging piece 71a extends from the end of the first rear partial panel 13a on the negative side in the X direction. The second swinging piece 71b is located on the negative side in the Y direction of the first rear partial panel 13a and extends from the positive side in the X direction beyond the first swinging piece 71a. Hook-and-loop fasteners 72a and 72b are attached to the first swinging piece 71a and the second swinging piece 71b, respectively. Adhesive members 73a and 73b such as tapes are attached to the second swinging piece 71b and the first rear partial panel 13a, respectively. Furthermore, hook-and-loop fasteners 72c and 72d are attached to the surface of the first side panel 14 on the positive side in the X direction and the surface of the negative side in the X direction, respectively.

[0180] 34(b), adhesive members 73a, 73b of the rear panel 13 are each adhered to the first side frame 51, thereby fixing the rear panel 13 to the first side frame 51. In addition, the hook-and-loop fastener 72a of the first swinging piece 71a and the hook-and-loop fastener 72b of the second swinging piece 71b are attached to hook-and-loop fasteners 72d, 72c of the first side panel 14, respectively. In this manner, the rear panel 13 and the first side panel 14 are detachably attached.

[0181] As shown in FIG. 35(a), a third rocking piece 71c and a fourth rocking piece 71d are provided at the end on the negative side in the X direction of the first top surface partial panel 11a of the top panel 11. Hook-and-loop fasteners 72e and 72f are attached to the third rocking piece 71c and the fourth rocking piece 71d, respectively. The hook-and-loop fasteners 72e and 72f are provided on the opposing surfaces of the third rocking piece 71c and the fourth rocking piece 71d, respectively. A fifth rocking piece 71e is provided at the end on the positive side in the Z direction of the first side panel 14. Hook-and-loop fasteners 72g and 72h are attached to both sides of the fifth rocking piece 71e.

[0182] As shown in FIG. 35(b), the third swinging piece 71c and the fourth swinging piece 71d of the top panel 11 rotate so as to sandwich the fifth swinging piece 71e of the first side panel 14 when viewed from the front. At this time, the hook and loop fastener 72e of the third swinging piece 71c and the hook and loop fastener 72g of the fifth swinging piece 71e are attached to each other, and the hook and loop fastener 72f of the fourth swinging piece 71d and the hook and loop fastener 72h of the fifth swinging piece 71e are attached to each other. In this way, the top panel 11 and the first side panel 14 are detachably attached to each other.

[0183] It is also possible to combine the multiple components disclosed in the above embodiment and modified examples as necessary. Alternatively, some components may be deleted from all the components shown in the above embodiment and modified examples. [Explanation of symbols]

[0184] 10 Transport trolley 11 Top Panel 12 Front Panel 13 Rear Panel 14 First side panel 15 Second side panel 16 Bottom Panel 20 Containment Space 40 Insulation section 50 Cart body 51 First side frame 52 Second side frame 53 Connecting members 58 Bottom plate 61 1st wheel 62 2nd wheel 63 3rd wheel 64 4th wheel 65 5th wheel 66 6th wheel

Claims

1. A transport cart that can be nested with other transport carts, a carriage body having a first side frame, a second side frame, and a connecting member connecting the first side frame and the second side frame to each other; a plurality of panels each having rigidity and provided to the cart body so as to be freely unfolded and folded; The plurality of panels can be in an unfolded state in which the plurality of panels are unfolded into a box shape, and in a folded state in which the plurality of panels are folded so as to be nestable with the other transport cart, the plurality of panels include a top panel, a front panel, a rear panel, a first side panel, a second side panel, and a bottom panel; The top panel has a top partial panel located above the second side frame and an additional top partial panel attached to the top partial panel so as to be freely foldable, In the folded state, the width of the front panel is equal to or greater than the width of the first side frame, covering a front portion of the first side frame.

2. 2. The transport dolly according to claim 1, wherein in the folded state, the top surface partial panel is arranged horizontally, and the additional top surface partial panel is arranged to hang down from the top surface partial panel.

3. 3. The transport cart according to claim 1 or 2, wherein a foldable bottom plate is provided on the connecting member, and in the folded state, the additional top surface partial panel is positioned around the inner periphery of the second side frame and on the inside of the folded bottom plate.

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