containment vessel

Abstract

To provide a storage container which prevents deformation and damage of a cylindrical recessed part for a caster and a periphery of the cylindrical recessed part.SOLUTION: A storage container 100 is configured so that casters R can be attached to a bottom surface 112. The bottom surface 112 is provided with caster attachment parts 200. Each caster attachment part 200 includes: a cylindrical recessed part 210 for a caster to which a shaft part of the caster R can be fixed; a reinforcement part 230 connected to a part of an outer peripheral surface 211 of the cylindrical recessed part 210 for the caster; and a flat surface part 240 disposed between an outer edge 116 of the bottom surface 112 and the cylindrical recessed part 210 for the caster.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a storage container that can be used with casters attached. [Background technology]

[0002] Various types of storage containers that can be used with casters attached have been known in the past, and for example, the storage container disclosed in Patent Document 1 has cylindrical recesses (mounting holes) for casters on the bottom surface into which the shafts of the casters can be inserted and fixed. This cylindrical recess for casters is cylindrical and is formed so as to protrude downward from the bottom surface of the storage container.

[0003] However, the cylindrical recess for the caster of the storage container disclosed in Patent Document 1 has a simple structure that is simply formed in a cylindrical shape so as to protrude from the bottom surface, so there was a problem that, for example, if the storage container was dropped onto the floor or the like from the bottom side around the cylindrical recess for the caster, the cylindrical recess for the caster and its surroundings would be deformed and damaged. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2001-114290 Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the above problems, the present invention provides a storage container that prevents deformation and damage to the cylindrical recess for a caster and its surroundings. [Means for solving the problem]

[0006] In order to solve the above problems, a storage container according to claim 1 of the present invention is a storage container configured so that casters can be attached to a bottom surface, and the bottom surface is provided with caster attachment portions, The caster mounting portion includes a cylindrical recess for a caster capable of fixing a shaft portion of the caster, a reinforcing portion connected to a part of an outer peripheral surface of the cylindrical recess for a caster, and a flat portion disposed between an outer edge of the bottom surface and the cylindrical recess for a caster, The planar portion protrudes from the bottom surface toward the back side of the bottom surface, and the planar portion has, on the front side of the bottom surface, A space recessed below the bottom surface is formed.

[0007] According to the above feature, since the flat portion is disposed between the outer edge of the bottom surface and the cylindrical recess for the caster, when the container is dropped onto a floor or the like from the outer edge of the bottom surface near the caster attachment portion, the flat portion absorbs the stress caused by the impact of the drop that is transmitted toward the cylindrical recess for the caster and disperses it to the surrounding area. As a result, deformation and damage to the cylindrical recess for the caster and its surrounding area can be prevented. Furthermore, since the reinforcing portion is connected to the outer circumferential surface of the cylindrical recess for the caster, even if stress is transmitted to the surrounding area of ​​the cylindrical recess for the caster, the reinforcing portion absorbs the stress and disperses it to the surrounding area, thereby preventing deformation and damage to the cylindrical recess for the caster and its surrounding area.

[0008] Furthermore, the claims of the present invention 3 The storage container according to the present invention is characterized in that the flat surface is connected to the outer peripheral surface of the cylindrical recess for the caster.

[0009] According to the above feature, the flat portion is directly connected to the outer circumferential surface of the cylindrical recess for a caster, so that the flat portion reinforces the periphery of the cylindrical recess for a caster and can directly and effectively absorb and disperse stress acting on the cylindrical recess for a caster, thereby effectively preventing the cylindrical recess for a caster from gradually deforming due to continuous stress acting on the cylindrical recess for a caster, i.e., creep.

[0010] Furthermore, the claims of the present invention 5 In the storage container according to the above aspect, the flat portion is connected to the outer peripheral surface of the cylindrical recess for the caster via the reinforcing portion.

[0011] According to the above features, since the flat portion is connected to the outer peripheral surface of the cylindrical recess for the caster via the reinforcing portion, the reinforcing portion can effectively absorb and disperse to the surrounding area some of the stress that could not be absorbed by the flat portion, thereby effectively preventing deformation and damage to the cylindrical recess for the caster and its surrounding area. [Effects of the Invention]

[0012] The storage container of the present invention prevents deformation and damage to the cylindrical recess for the caster and its surroundings. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is an overall perspective view of a storage container according to a first embodiment of the present invention. [Figure 2] 1A is a plan view of the storage container, FIG. 1B is a front view of the storage container, and FIG. 1C is a side view of the storage container. [Figure 3] 1A is a bottom view of the container, and FIG. 1B is an enlarged perspective view of the periphery of the caster attachment portion as viewed from the bottom side of the container. [Figure 4] (a) is an enlarged bottom view of the area around the caster mounting portion, and (b) is a cross-sectional view taken along the line AA. [Figure 5] 10(a) is a bottom view of a storage container according to a second embodiment of the present invention, and FIG. 10(b) is an enlarged perspective view of the periphery of a caster attachment portion as viewed from the bottom side of the storage container. [Figure 6] (a) is an enlarged bottom view of the area around the caster mounting part, and (b) is a BB cross-sectional view. [Figure 7] (a) is an enlarged perspective view of the area around the caster mounting portion shown from the bottom side of a storage container according to embodiment 3 of the present invention, (b) is a CC end view, (c) is an enlarged perspective view of the area around the caster mounting portion shown from the bottom side of a storage container according to embodiment 4 of the present invention, and (d) is a DD end view. [Figure 8] 10A is an enlarged perspective view of the periphery of the caster mounting portion shown from the bottom side of a storage container according to a fifth embodiment of the present invention, FIG. 10B is an EE end view, and FIG. 10C is an FF end view. [Explanation of symbols]

[0014] 100 Storage Container 112 bottom 116 outer edge 200 Caster mounting part 210 Cylindrical recess for caster 211 Outer surface 230 Reinforcement 240 Plane section R Caster DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0016] <Embodiment 1> First, Fig. 1 and Fig. 2 show a storage container 100 according to a first embodiment of the present invention. Fig. 1 is an overall perspective view of the storage container 100, Fig. 2(a) is a plan view of the storage container 100, Fig. 2(b) is a front view of the storage container 100, and Fig. 2(c) is a side view of the storage container 100. Note that Fig. 2 shows the storage container 100 without the casters R.

[0017] 1 and 2, the storage container 100 is made entirely of synthetic resin and has a generally rectangular box shape with an open front and top, including a bottom wall 110, side walls 120 extending from both sides of the bottom wall 110, and a rear wall 130 extending from the rear side of the bottom wall 110. The bottom wall 110 is generally flat, and has a pair of bottom wall protrusions 111 on its front end. The bottom wall protrusions 111 protrude upward from the bottom wall 110 and are inclined so that their front ends are higher. An inner tray 140 is slidably accommodated on top of the bottom wall protrusions 111.

[0018] The inner tray 140 can store paper such as copy paper, is made entirely of synthetic resin, and has a generally rectangular box shape with openings on the front and top sides, including a bottom plate 141, side plates 142 extending from both sides of the bottom plate 141, and a rear plate 143 extending from the rear side of the bottom plate 141. The bottom plate 141 is inclined so that it is lower toward the rear. Furthermore, an opening / closing door 144 is provided at the front end of the bottom plate 141, and the opening / closing door 144 rotates about shafts 145 on both sides to open and close the front end of the bottom plate 141. Therefore, by rotating the opening / closing door 144 upward to close the front end of the bottom plate 141, it is possible to prevent items stored on the bottom plate 141 of the inner tray 140 from falling off the inner tray 140. On the other hand, if the opening and closing door 144 is rotated downward to open the front end side of the bottom plate 141, the contents stored on the bottom plate 141 can be easily taken out.

[0019] 1, storage containers 100 containing inner trays 140 can also be stacked one above the other. A notched grip portion 121 is formed on the lower end of the side wall 120, allowing a user to easily stack the storage containers 100 by placing their hands on the grip portion 121 and lifting the storage container 100. Casters R are attached to the bottom wall 110 of the lower storage container 100, making it easy to move the storage container 100 on the floor.

[0020] Next, the caster mounting portion for mounting the caster R will be described with reference to Figures 3 and 4. Figure 3(a) is a bottom view of the storage container 100, Figure 3(b) is an enlarged perspective view of the periphery of the caster mounting portion 200 shown from the bottom side of the storage container 100, Figure 4(a) is an enlarged bottom view of the periphery of the caster mounting portion 200, and Figure 4(b) is an AA cross-sectional view.

[0021] As shown in Figures 3 and 4(a), a flat bottom surface 112 on the back side of the bottom wall 110 is provided with leg ribs 114 that protrude from the bottom surface 112. 2. The base 112 has a generally rectangular frame shape, with the base ribs 114 extending continuously in the circumferential direction of the base 112. When the storage containers 100 are stacked, the base ribs 114 are disposed on the inside of the upper ends of the side walls 120 and rear walls 130 of the lower storage container 100, thereby preventing the stacked storage containers 100 from shifting. The base ribs 114 are formed thicker than the rib-shaped reinforcing portions 230, which will be described later. Furthermore, the top surfaces of the base ribs 114 are recessed, which allows for stable quality to be maintained during injection molding. The base ribs 114 are optional and may not be provided. The bottom surface 112 is provided with a plurality of bottom surface ribs 115 extending vertically and horizontally, reinforcing the entire bottom surface 112.

[0022] In addition, a caster mounting portion 200 for mounting a caster R on the inside of the leg rib 114 is provided at a corner portion 113 of the bottom surface 112 on the back side of the bottom wall 110. As shown in Figures 3 and 4, the caster mounting portion 200 includes a cylindrical recess 210 for a caster to which the shaft portion of the caster R can be fixed, a rib-shaped reinforcing portion 230 connected to an outer peripheral surface 211 of the cylindrical recess 210 for a caster, and a flat portion 240 disposed between the outer edge 116 of the bottom surface 112 and the cylindrical recess 210 for a caster.

[0023] The cylindrical recess 210 for a caster has a cylindrical shape protruding from the bottom surface 112 and includes a recess 212 into which the shaft of the caster R is inserted and fixed. Protrusions 213 are arranged at equal intervals on the inner circumferential surface of this recess 212, allowing the shaft of the caster R to be fixed more firmly. The thickness of the cylindrical recess 210 for a caster is formed to be thicker than that of the reinforcing portion 230. Although the cylindrical recess 210 for a caster has a cylindrical shape, this is not limited thereto and may have any shape, such as a substantially square prism, as long as the shaft of the caster R can be inserted and fixed. Furthermore, the shape of the cylindrical recess 210 for a caster can be appropriately modified to match the shaft of the caster R so that the shaft of a conventionally used caster R can be inserted and fixed.

[0024] 4, three rib-shaped reinforcing portions 230 are connected to the outer peripheral surface 211 of the cylindrical recessed portion 210 for a caster. Each reinforcing portion 230 protrudes from the bottom surface 112, and all have the same height H2 from the bottom surface 112. Furthermore, the central reinforcing portion 230 extends linearly from one end 231 connected to the outer peripheral surface 211 of the cylindrical recessed portion 210 for a caster to the opposite end 232. Meanwhile, the reinforcing portions 230 on both sides have one end 231 connected to the outer peripheral surface 211 of the cylindrical recessed portion 210 for a caster curved toward the outer peripheral surface 211, but the opposite end 232 extends linearly. As shown in Figure 4(b), the height H2 of the reinforcing portion 230 is the same as the height H1 of the portion protruding from the bottom surface 112 of the cylindrical recess for the caster 210, so the tip surface 233 of the reinforcing portion 230 and the tip surface 214 of the cylindrical recess for the caster 210 are flush with each other.

[0025] The flat portion 240 is connected to the outer peripheral surface 211 of the cylindrical recessed portion 210 for a caster on the opposite side from the reinforcing portion 230. The flat portion 240 rises to protrude from the bottom surface 112 and extends linearly along the inside of the leg rib 114. The height H3 of the flat portion 240 from the bottom surface 112 is the same as the height H1 of the portion of the cylindrical recessed portion 210 for a caster that protrudes from the bottom surface 112, so the flat portion 240 and the tip surface 214 of the cylindrical recessed portion 210 for a caster are flush with each other. Furthermore, the height H1 of the portion of the cylindrical recessed portion 210 for a caster that protrudes from the bottom surface 112, the height H2 of the reinforcing portion 230, and the height H3 of the flat portion 240 from the bottom surface 112 are the same, so the tip surface 233 of the reinforcing portion 230, the tip surface 214 of the cylindrical recessed portion 210 for a caster, and the flat portion 240 are all flush with each other.

[0026] For example, when the container 100 is dropped onto the floor or the like from the outer edge 116 side of the bottom surface 112 around the caster attachment portion 200, a stress F1 caused by the impact at the time of dropping is transmitted from the outer edge 116 side toward the cylindrical recess 210 for the caster, as shown in FIG. According to the storage container 100 of the present invention, the flat surface 240 is disposed between the outer edge 116 of the bottom surface 112 and the cylindrical recessed portion 210 for the caster, and therefore the flat surface 240 absorbs the stress F1 transmitted toward the cylindrical recessed portion 210 for the caster and disperses it to the surrounding area. As a result, deformation and damage to the cylindrical recessed portion 210 for the caster and its surrounding area can be prevented.

[0027] Furthermore, since the reinforcing portion 230 is connected to the outer peripheral surface 211 of the cylindrical recessed portion for a caster 210, even if stress F1 is transmitted to the periphery of the cylindrical recessed portion for a caster 210, the reinforcing portion 230 absorbs the stress F1 and disperses it to the periphery. As a result, deformation and damage to the cylindrical recessed portion for a caster 210 and its surroundings can be prevented.

[0028] 4, the flat surface 240 is directly connected to the outer peripheral surface 211 of the cylindrical caster recess 210, and therefore the flat surface 240 reinforces the periphery of the cylindrical caster recess 210 and can directly and effectively absorb and disperse the stress F1 acting on the cylindrical caster recess 210. This effectively prevents the cylindrical caster recess 210 from gradually deforming due to the stress F1 acting continuously on the cylindrical caster recess 210, that is, from deforming due to so-called creep.

[0029] 4, the flat portion 240 is directly connected to the outer circumferential surface 211 of the cylindrical recessed portion for a caster 210, but this is not limiting, and as will be described later, the flat portion 240 may be connected to the outer circumferential surface 211 of the cylindrical recessed portion for a caster 210 via a reinforcing portion. Regardless of how the flat portion 240 is connected to the outer circumferential surface 211 of the cylindrical recessed portion for a caster 210, as long as the flat portion 240 is disposed between the outer edge 116 of the bottom surface 112 and the cylindrical recessed portion for a caster 210, the flat portion 240 absorbs the stress F1 transmitted toward the cylindrical recessed portion for a caster 210 and distributes it to the surrounding area, thereby preventing deformation and damage to the cylindrical recessed portion for a caster 210 and its surroundings.

[0030] 4, the reinforcing portion 230 is disposed on the opposite side of the cylindrical recess 210 for a caster from the flat portion 240, but is not limited thereto, and as will be described later, the reinforcing portion may be disposed between the flat portion 240 and the cylindrical recess 210 for a caster. Regardless of where the reinforcing portion 230 is disposed around the cylindrical recess 210 for a caster, as long as the reinforcing portion 230 is connected to the outer peripheral surface 211 of the cylindrical recess 210 for a caster, the reinforcing portion 230 absorbs the stress F1 and distributes it to the surroundings, thereby preventing deformation and damage to the cylindrical recess 210 for a caster and its surroundings.

[0031] 4, the flat portion 240 is formed continuously in a straight line along the leg rib 114, but is not limited to this, and the flat portion 240 may be formed in any position and in any shape as long as it is positioned between the outer edge 116 of the bottom surface 112 and the cylindrical caster recess 210. Note that, as shown in FIG. 4(a), if the flat portion 240 extends along the outer edge 116 of the bottom surface 112 longer than the cylindrical caster recess 210, the stress F1 transmitted from the outer edge 116 side can be absorbed and dispersed over a wide range, and deformation and damage to the cylindrical caster recess 210 and its surroundings can be more effectively prevented.

[0032] 4, the tip surface 233 of the reinforcing portion 230, the tip surface 214 of the cylindrical recess 210 for the caster, and the flat portion 240 are all flush with each other. Therefore, the caster mounting portion 200 does not have any locally protruding portions, which prevents the caster mounting portion 200 from getting caught on other components and being damaged when the storage container 100 is transported or stored. Furthermore, because the caster mounting portion 200 does not have any locally protruding portions, when stress F1 acts on the caster mounting portion 200, the number of locations where stress is locally concentrated can be reduced, which prevents deformation and damage to the caster mounting portion 200.

[0033] 4, the height H1 of the portion protruding from the bottom surface 112 of the cylindrical recessed portion 210 for a caster, the height H2 of the reinforcing portion 230, and the height H3 of the flat portion 240 from the bottom surface 112 are the same, but this is not limited to this and each height can be determined arbitrarily. For example, the height H2 of the reinforcing portion 230 may be lower than the height H1 of the portion protruding from the bottom surface 112 of the cylindrical recessed portion 210 for a caster. The height H3 of the flat portion 240 from the bottom surface 112 may also be lower than the height H1 of the portion protruding from the bottom surface 112 of the cylindrical recessed portion 210 for a caster.

[0034] 4(b), the height H1 of the portion of the cylindrical recess 210 for a caster protruding from the bottom surface 112 is reduced so that the cylindrical recess 210 for a caster does not protrude beyond the leg rib 114, that is, so that the tip surface 214 of the cylindrical recess 210 for a caster is lower than the leg rib 114, but this is not limiting. For example, the height H1 of the portion of the cylindrical recess 210 for a caster protruding from the bottom surface 112 may be increased so that the tip surface 214 of the cylindrical recess 210 for a caster and the tip 117 of the leg rib 114 are flush with each other.

[0035] 4(a), one end 231 of the reinforcing portion 230 is curved toward the outer peripheral surface 211 of the cylindrical recessed portion for caster 210, and can effectively absorb and distribute the stress F1 applied to the cylindrical recessed portion for caster 210. Furthermore, one end 231 of each reinforcing portion 230 is arranged so as to spread radially from the center of the cylindrical recessed portion for caster 210, and therefore the stress F1 applied to the cylindrical recessed portion for caster 210 is easily absorbed and distributed evenly by each reinforcing portion 230.

[0036] As shown in FIG. 4(a), the caster mounting portion 200 includes three reinforcing portions 230. However, this is not a limitation and any number of reinforcing portions 230 may be included. For example, the caster mounting portion 200 may include one reinforcing portion 230 or four or more reinforcing portions 230. Furthermore, while the reinforcing portion 230 has a shape including a curved portion and a straight portion, this is not a limitation and the reinforcing portion 230 may have any shape as long as it is connected to the outer circumferential surface 211 of the cylindrical caster recess 210 and can absorb and distribute the stress F1 applied to the cylindrical caster recess 210. Furthermore, while the reinforcing portion 230 is rib-shaped, this is not a limitation and, as will be described later, it may have any shape, such as a flat shape, as long as it is connected to the outer circumferential surface 211 of the cylindrical caster recess 210 and can absorb and distribute the stress F1 applied to the cylindrical caster recess 210.

[0037] 2 and 3, the storage container 100 has side walls 120 on both sides, a rear wall 130 on the rear side, and an open front side, so that the rigidity of the opening side tends to be lower structurally than the side walls. Therefore, as shown in FIG. 3, a reinforcing portion need not be provided on the bottom surface 112 in the direction along the side walls 120 (toward the opening side). However, it is preferable to provide a reinforcing portion in the direction perpendicular to the side walls 120 (direction perpendicular to the direction toward the opening side) to increase the rigidity of the opening side. Therefore, the reinforcing portion 230 is formed so as to extend in the direction perpendicular to the side walls 120. Furthermore, no reinforcing portion other than the reinforcing portion 230, such as another reinforcing portion extending in the direction along the side walls 120 (toward the opening side) and connected to the reinforcing portion 230, is formed on the bottom surface 112.

[0038] 1, storage container 100 is a substantially square box-like shape with openings on the front and top sides that can accommodate inner tray 140, but is not limited to this and may be a storage container of any shape, such as a box-like shape with only the top side open, as long as casters can be attached to bottom surface 112. Furthermore, storage container 100 is for storing paper, but is not limited to this and may be a storage container for any purpose, such as a storage container for storing clothes, etc., or a storage container for storing garbage, etc.

[0039] <Embodiment 2> Next, a storage container 100A according to a second embodiment of the present invention is shown in FIGS. 5 and 6. FIG. 5(a) is a bottom view of the storage container 100A, FIG. 5(b) is an enlarged perspective view of the periphery of the caster attachment portion 200A shown from the bottom side of the storage container 100A, FIG. 6(a) is an enlarged bottom view of the periphery of the caster attachment portion 200A, and FIG. 6(b) is a B-B cross-sectional view. The storage container 100A according to the second embodiment differs from the storage container 100 according to the first embodiment shown in FIGS. 1 to 4 only in that it includes a reinforcing portion 250A between the flat portion 240A and the cylindrical recessed portion for caster 210A. Since the other configurations are basically the same as those of the storage container 100 according to the first embodiment, detailed description thereof will be omitted.

[0040] 5 and 6(a), a leg rib 114A protruding from the bottom surface 112A is provided on the bottom surface 112A of the bottom wall 110A. The leg rib 114A has a substantially rectangular frame shape and is provided continuously in the circumferential direction of the bottom surface 112A. In addition, a plurality of bottom surface ribs 115A extending vertically and horizontally are provided on the bottom surface 112A to reinforce the entire bottom surface 112A.

[0041] 5 and 6, the caster mounting portion 200A includes a cylindrical caster recess 210A capable of fixing the shaft of a caster R to the inside of the leg rib 114A. A flat portion 240A is disposed between the outer edge 116A of the bottom surface 112A and the cylindrical caster recess 210A. A reinforcing portion 250A is disposed between the flat portion 240A and the cylindrical caster recess 210A. A reinforcing portion 230A is disposed on the opposite side of the cylindrical caster recess 210A from the reinforcing portion 250A. The reinforcing portion 250A and the reinforcing portion 230A are positioned symmetrically with respect to the center line OO of the cylindrical caster recess 210A. Furthermore, because the flat portion 240A and the reinforcing portion 250A are disposed between the outer edge 116A of the bottom surface 112A and the cylindrical recessed portion for caster 210A, the cylindrical recessed portion for caster 210A is spaced apart from the outer edge 116A of the bottom surface 112A. Therefore, the caster R attached to the cylindrical recessed portion for caster 210A is unlikely to be exposed from the outer edge 116A of the bottom surface 112A, and therefore does not get in the way when the caster R rotates during storage or transportation of the storage container 100A.

[0042] As shown in FIG. 6, one end 251A of the reinforcing portion 250A is connected to the outer peripheral surface 211A of the cylindrical recessed portion 210A for a caster, and the other end 252A is connected to the flat portion 240A. The reinforcing portion 250A protrudes from the bottom surface 112A and extends linearly from the one end 251A to the other end 252A. The thickness of the cylindrical recessed portion 210A for a caster is thicker than that of the reinforcing portion 230A and the reinforcing portion 250A. As shown in FIG. 6(b), the height H4 of the reinforcing portion 250A from the bottom surface 112A is the same as the height H1 of the portion of the cylindrical recessed portion 210A for a caster that protrudes from the bottom surface 112A. Therefore, the tip surface 253A of the reinforcing portion 250A and the tip surface 214A of the cylindrical recessed portion 210A for a caster are flush with each other.

[0043] The flat portion 240A protrudes from the bottom surface 112A and extends linearly along the inside of the leg rib 114A. The height H3 of the flat portion 240A from the bottom surface 112A is the same as the height H4 of the reinforcing portion 250A, so the flat portion 240A and the tip surface 253A of the reinforcing portion 250A are flush with each other. Furthermore, the height H1 of the portion of the cylindrical recess 210 for a caster protruding from the bottom surface 112, the height H2 of the reinforcing portion 230A, the height H4 of the reinforcing portion 250A, and the height H3 of the flat portion 240A from the bottom surface 112 are the same. Therefore, the flat portion 240A, the tip surface 253A of the reinforcing portion 250A, the tip surface 214A of the cylindrical recess 210A for a caster, and the tip surface 233A of the reinforcing portion 230A are all flush with each other. Therefore, the caster attachment portion 200A does not have any locally protruding portions, so that the caster attachment portion 200A will not get caught on other members and be damaged when the storage container 100A is transported or stored. Furthermore, when stress F1 acts on the caster mounting portion 200A, the number of locations where stress concentrates can be reduced, preventing deformation and damage to the caster mounting portion 200A.

[0044] Furthermore, if the storage container 100A is dropped onto a floor or other surface from the outer edge 116A of the bottom surface 112A near the caster attachment portion 200A, stress F2 due to the impact of the drop is transmitted from the outer edge 116A toward the cylindrical caster recess 210A, as shown in FIG. 6(a). However, according to the storage container 100A of the present invention, the flat portion 240A is disposed between the outer edge 116A of the bottom surface 112A and the cylindrical caster recess 210A. Therefore, the flat portion 240A absorbs the stress F2 transmitted toward the cylindrical caster recess 210A and disperses it to the surrounding area. Furthermore, since the flat portion 240A is connected to the outer peripheral surface 211A of the cylindrical caster recess 210A via the reinforcing portion 250A, the reinforcing portion 250A can effectively absorb and disperse a portion of the stress F2 that could not be absorbed by the flat portion 240A. As a result, deformation and damage to the cylindrical recess 210A for the caster and its surroundings can be effectively prevented.

[0045] Furthermore, since the reinforcing portions 250A and 230A are arranged so as to radiate out from the center of the cylindrical recess 210A for the caster, the stress F2 acting on the cylindrical recess 210A for the caster is easily absorbed and dispersed evenly by each reinforcing portion 250A and each reinforcing portion 230A.

[0046] In Figure 6, the height H1 of the portion protruding from the bottom surface 112A of the cylindrical recess 210A for the caster, the height H2 of the reinforcing portion 230A, the height H4 of the reinforcing portion 250A, and the height H3 of the flat portion 240A from the bottom surface 112A are the same, but this is not limited to this and each height can be determined arbitrarily. For example, the height H4 of the reinforcing portion 250A may be lower than the height H1 of the portion protruding from the bottom surface 112A of the cylindrical recess 210A for the caster.

[0047] Although the reinforcing portion 250A is shown in FIG. 6 as being linear, this is not intended to be limiting. For example, the reinforcing portion 250A may be curved like the reinforcing portion 230A. The reinforcing portion 250A may have any shape as long as it is connected between the flat portion 240A and the cylindrical recessed portion 210A for the caster and can absorb and disperse the stress F2. Although the reinforcing portion 250A is rib-shaped, this is not intended to be limiting. As described below, the reinforcing portion 250A may have any shape as long as it is connected between the flat portion 240A and the cylindrical recessed portion 210A for the caster and can absorb and disperse the stress F2. The width of the flat portion 240A may be varied as appropriate. The flat portion 240A according to the second embodiment shown in FIG. 6 is narrower than the flat portion 240 according to the first embodiment shown in FIG. 4.

[0048] <Embodiment 3> Next, a storage container 100B according to a third embodiment of the present invention is shown in Figures 7(a) and (b). Figure 7(a) is an enlarged perspective view of the periphery of the caster attachment portion 200B shown from the bottom side of the storage container 100B, and Figure 7(b) is a CC end view. The storage container 100B according to the third embodiment differs from the storage container 100 according to the first embodiment shown in Figures 1 to 4 only in the shape of the reinforcing portion 230BB, and other configurations are basically the same as those of the storage container 100 according to the first embodiment, so detailed description will be omitted.

[0049] As shown in Fig. 7(a), a rib-shaped reinforcing portion 230B and a flat reinforcing portion 230BB are connected to the outer peripheral surface 211B of the cylindrical recessed portion for caster 210B. The rib-shaped reinforcing portion 230B has the same configuration as the reinforcing portion 230 of the storage container 100 according to the first embodiment shown in Figs. 1 to 4. One of the flat reinforcing portions 230BB is formed so as to protrude from the bottom surface 112B. Specifically, as shown in Fig. 7(b), the reinforcing portion 230BB has a side wall 234BB protruding from the bottom surface 112B and a flat tip surface 233BB connecting the side walls 234BB. 1 to 4. The reinforcing portion 230BB is configured by connecting a planar tip surface 233BB between two of the three reinforcing portions 230 of the storage container 100 according to the first embodiment shown in FIGS. 1 to 4. The height H5 of the reinforcing portion 230BB from the bottom surface 112B is equal to the height H2 of the reinforcing portion 230B. The reinforcing portion 230BB is recessed upward from the bottom surface 112B, and is hollow inside.

[0050] By providing the planar reinforcing portion 230BB in this way, even if stress is transmitted to the periphery of the cylindrical recessed portion 210B for casters when the storage container 100B is dropped, the reinforcing portion 230BB absorbs the stress and efficiently distributes the absorbed stress widely and to the surrounding area along the plane, thereby preventing deformation and damage to the cylindrical recessed portion 210B for casters and its surrounding area.

[0051] <Embodiment 4> Next, a storage container 100C according to a fourth embodiment of the present invention is shown in Figures 7(c) and (d). Figure 7(c) is an enlarged perspective view of the periphery of the caster attachment portion 200C shown from the bottom side of the storage container 100C, and Figure 7(d) is a DD end view. The storage container 100C according to the fourth embodiment differs from the storage container 100 according to the first embodiment shown in Figures 1 to 4 only in the shape of the reinforcing portion 230C, and other configurations are basically the same as those of the storage container 100 according to the first embodiment, so detailed description will be omitted.

[0052] As shown in FIG. 7(c), one planar reinforcing portion 230C is connected to the outer peripheral surface 211C of the cylindrical recessed portion 210C for a caster. The planar reinforcing portion 230C is formed to protrude from the bottom surface 112C. Specifically, as shown in FIG. 7(d), the reinforcing portion 230C is composed of a side wall 234C protruding from the bottom surface 112C and a planar tip surface 233C connecting the side walls 234C. A rib-shaped middle wall 235C is provided to protrude from the inner surface of the tip surface 233C, and one end 236C of the middle wall 235C is connected to the outer peripheral surface 211C of the cylindrical recessed portion 210C for a caster. In this way, the reinforcing portion 230C is configured such that the three rib-shaped reinforcing portions 230 of the storage container 100 according to the first embodiment shown in FIGS. 1 to 4 are connected by the planar tip surface 233C. The height H6 of the reinforcing portion 230C from the bottom surface 112C is equal to the height of the portion of the cylindrical recessed portion 210C for caster that protrudes from the bottom surface 112C (see height H1 shown in FIG. 4(b)). The reinforcing portion 230C is recessed upward from the bottom surface 112C, and is hollow inside.

[0053] By providing the planar reinforcing portion 230C in this way, even if stress is transmitted to the periphery of the cylindrical recessed portion 210C for casters when the storage container 100C is dropped, the reinforcing portion 230C absorbs the stress and efficiently distributes the absorbed stress widely around the periphery along the plane, thereby preventing deformation and damage to the cylindrical recessed portion 210C for casters and its surroundings.

[0054] 7(c), the flat portion 240C and the reinforcing portion 230C are connected to a portion of the outer peripheral surface 211C of the cylindrical recessed portion for a caster 210C, but are not connected to form a surface surrounding the entire outer peripheral surface 211C of the cylindrical recessed portion for a caster 210C. Because the flat portion 240C and the reinforcing portion 230C are connected to a portion of the outer peripheral surface 211C of the cylindrical recessed portion for a caster 210C, a portion of the outer peripheral surface 211C of the cylindrical recessed portion for a caster 210C is exposed to the outside and is not connected to anything. By allowing this portion to deform slightly, it is possible to release some of the stress acting on the cylindrical recessed portion for a caster 210C, preventing deformation and damage to the cylindrical recessed portion for a caster 210C and its surroundings.

[0055] <Embodiment 5> Next, a storage container 100D according to a fifth embodiment of the present invention is shown in FIG. 8(b) is an EE end view, and FIG. 8(c) is an FF end view. The storage container 100D according to the fifth embodiment differs from the storage container 100A according to the second embodiment shown in FIGS. 5 and 6 only in the shapes of the reinforcing parts 230D and 250D, and other configurations are basically the same as those of the storage container 100A according to the second embodiment, so detailed description thereof will be omitted.

[0056] As shown in FIG. 8, one planar reinforcing portion 230D is connected to the outer peripheral surface 211D of the cylindrical recess 210D for a caster. Furthermore, one planar reinforcing portion 250D is disposed between the planar portion 240D and the cylindrical recess 210D for a caster. The planar reinforcing portion 230D is formed to protrude from the bottom surface 112D. Specifically, as shown in FIG. 8(b), the reinforcing portion 230D is composed of a side wall 234D protruding from the bottom surface 112D and a planar tip surface 233D connecting the side walls 234D. In this manner, the reinforcing portion 230D is configured such that the two rib-shaped reinforcing portions 230A of the storage container 100A according to the second embodiment shown in FIGS. 5 and 6 are connected by the planar tip surface 233D. The height H7 of the reinforcing portion 230D from the bottom surface 112D is equal to the height of the portion of the cylindrical recess 210D for caster that protrudes from the bottom surface 112D (see height H1 shown in FIG. 6(b)). The reinforcing portion 230D is recessed upward from the bottom surface 112D, and is hollow inside.

[0057] The planar reinforcing portion 250D is formed to protrude from the bottom surface 112D. Specifically, as shown in FIG. 8(c), the reinforcing portion 250D is composed of a sidewall 254D protruding from the bottom surface 112D and a planar tip surface 253D connecting the sidewalls 254D. Thus, the reinforcing portion 250D is configured by connecting the two rib-shaped reinforcing portions 250A of the storage container 100A according to the second embodiment shown in FIGS. 5 and 6 with the planar tip surface 253D. The height H8 of the reinforcing portion 250D from the bottom surface 112D is equal to the height of the portion of the cylindrical recess 210D for the caster protruding from the bottom surface 112D (see height H1 shown in FIG. 6(b)). The reinforcing portion 250D is recessed upward from the bottom surface 112D, and is hollow.

[0058] By providing the planar reinforcing portion 250D in this way, part of the stress that the planar portion 240D cannot absorb due to the impact when the storage container 100D is dropped can be effectively absorbed by the reinforcing portion 250D, and the absorbed stress can be efficiently dispersed widely around along the plane, thereby effectively preventing deformation and damage to the cylindrical recessed portion for caster 210D and its surroundings.

[0059] Furthermore, by providing the planar reinforcing portion 230D, even if stress is transmitted to the periphery of the cylindrical recessed portion 210D for casters when the storage container 100D is dropped, the reinforcing portion 230D absorbs the stress and efficiently distributes the absorbed stress widely around the periphery along the plane, thereby preventing deformation and damage to the cylindrical recessed portion 210D for casters and its surroundings.

[0060] In FIG. 8, the storage container 100D has both the planar reinforcing portion 230D and the planar reinforcing portion 250D, but this is not limited to this. The storage container 100D may have the rib-like reinforcing portion 250A of the storage container 100A according to the second embodiment shown in FIG. 5 and the planar reinforcing portion 230D shown in FIG. 8, or may have the planar reinforcing portion 250D shown in FIG. 8 and the rib-like reinforcing portion 230A of the storage container 100A according to the second embodiment shown in FIG. 5.

[0061] As shown in Figure 8(a), the planar reinforcing portion 250D and the reinforcing portion 230D are connected to a part of the outer peripheral surface 211D of the cylindrical recessed portion 210D for a caster, and are not connected to form a plane surrounding the entire outer peripheral surface 211D of the cylindrical recessed portion 210D for a caster. As a result of the connection to the cylindrical recess 210D for the caster, a part of the outer surface 211D of the cylindrical recess 210D for the caster has a part that is not connected to anything and is exposed to the outside, and by allowing slight deformation of this part, it is possible to release some of the stress acting on the cylindrical recess 210D for the caster, thereby preventing deformation and damage to the cylindrical recess 210D for the caster and its surroundings.

[0062] The storage container of the present invention is not limited to the above examples, and various modifications and combinations are possible within the scope of the claims and the scope of the embodiments, and these modifications and combinations are also included in the scope of rights.

Claims

1. A storage container configured so that casters can be attached to the bottom surface, The bottom surface is provided with a caster mounting portion, The caster mounting portion is a cylindrical recess for a caster capable of fixing a shaft portion of the caster; a reinforcing portion connected to a part of the outer peripheral surface of the cylindrical recess for the caster; a flat surface disposed between the outer edge of the bottom surface and the cylindrical recess for the caster; the planar portion protrudes beyond the bottom surface toward a rear side of the bottom surface, A storage container characterized in that a space recessed below the bottom surface is formed in the flat portion on the surface side of the bottom surface.

2. The reinforcing portion is provided in plurality, The container according to claim 1 , wherein the flat surface portion is provided at least in a range facing the reinforcing portion.

3. 3. The container according to claim 1, wherein the flat surface is connected to an outer circumferential surface of the cylindrical recess for the caster.

4. 3. The container according to claim 1, wherein the flat surface is connected to and overlaps a part of the cylindrical recess for the caster.

5. 3. The container according to claim 1, wherein the flat portion is connected to an outer peripheral surface of the cylindrical recess for the caster via the reinforcing portion.

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