Box frame structure

Abstract

To provide a frame structure of a box which prevents a corner member provided in a frame from protruding from the frame.SOLUTION: There is provided a frame structure of a box in which a longitudinal frame 10, a transverse frame 11, and a depth frame 12 which form a frame of a box are joined by a corner member 13 disposed in a corner part, the corner member 13 is stored in a step part formed between an end face of the longitudinal frame 10 and an upper face or a lower face of the transverse frame 11 and the depth frame 12 joined to the longitudinal frame 10. At this time, it is preferable that the upper face or the lower face of the transverse frame 11 and the depth frame 12 are located outside the end face of the longitudinal frame 10, and the thickness of the corner member 13 is identical to the step part.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a frame structure for a box such as a work box or a box for storing electrical equipment. [Background technology]

[0002] A commonly used frame structure for boxes such as work boxes and boxes for storing electrical equipment is a rectangular parallelepiped structure consisting of 12 frames, 4 vertical frames, 4 horizontal frames, and 4 depth frames, which are joined together to form the front, back, left and right sides, top, and floor. By attaching panels to each side, a work space that a person can enter or a space for storing electrical and electronic equipment is created.

[0003] Patent Document 1 describes a mounting bracket that is placed on the inside of the corner where the frames are joined. This mounting bracket is placed on the inside of the corner and protrudes into the internal space defined by the frame, which may get in the way. It is possible to place the mounting bracket on the frame at the corner so that the mounting bracket does not protrude into the internal space, but in that case, the mounting bracket protrudes from the frame, which increases the external shape of the box. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2006-25472 A Summary of the Invention [Problem to be solved by the invention]

[0005] SUMMARY OF THE PRESENT INVETION It is therefore an object of the present invention to provide a box frame structure which overcomes the above-mentioned problems of the conventional art and in which corner members provided on the frame do not protrude from the frame. [Means for solving the problem]

[0006] The present invention, which has been made to solve the above problems, is a box frame structure in which vertical frames, horizontal frames, and depth frames that form the skeleton of a box are joined by corner members arranged at the corner portions, The end faces of the horizontal frame and the end faces of the depth frame each abut against a side surface of the vertical frame, and the outer surfaces of the horizontal frame and the depth frame facing outward in the height direction of the box are formed with a first horizontal plane located outside the end faces of the vertical frames in the height direction, a second horizontal plane located at approximately the same height as the end faces of the vertical frames, and a vertical plane connecting the first horizontal plane and the second horizontal plane; Corner parts teeth, Vertical frame end face and the second horizontal plane and the first horizontal plane It is stored in the step formed between The end face of the corner member is in contact with the vertical face. It is characterized by the above.

[0007] It is preferable that the upper or lower surfaces of the horizontal and depth frames are formed to be located outside the end faces of the vertical frames, and that the thickness of the corner members is the same as that of the step portion. It is also preferable that the horizontal and depth frames have a first horizontal surface that is the upper or lower surface, a second horizontal surface that is located at approximately the same height as the end faces of the vertical frames, and a vertical surface that connects the first and second horizontal surfaces, and that the second horizontal surface forms a part of the step portion, and that the end faces of the corner members stored in the step portion abut against the vertical surface.

[0008] The corner members may be arranged across a plurality of corners and may be housed between the vertical faces of the horizontal frames or between the vertical faces of the depth frames. The box can be hung and transported, or the box can be fixed to the installation location. It is preferable to have a structure in which a functional member that adds a function is attached. Plate-shaped components It is preferable that: Effect of the Invention

[0009] According to the frame structure of the present invention, it is possible to provide a frame structure for a box in which corner members provided on the frame do not protrude from the frame. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is an overall perspective view of the frame structure of the box. [Diagram 2] FIG. 4 is an external perspective view of a frame connection portion on the top surface side. [Diagram 3] FIG. [Figure 4] A cross-sectional view of the horizontal frame and the depth frame. [Diagram 5] 13 is an exploded perspective view of the frame connection portion on the top surface side. FIG. [Figure 6] FIG. [Figure 7] 1 is a side view of a frame connection portion on the top surface side, showing the state before the corner members are attached. [Figure 8] 8 is a diagram showing the positional relationship when attaching a corner member to the frame connecting portion in FIG. 7. FIG. [Figure 9] 13 is a side view of the frame connection part on the top surface side, showing the state after the corner member has been attached. [Figure 10] 1 is a plan view of a corner member according to an embodiment of the present invention, which is provided on the top surface side in this embodiment. [Figure 11] 11 is a plan view of a corner member having a shape different from that shown in Fig. 10. Note that this is a corner member provided on the bottom side in this embodiment. [Figure 12] 12 is a perspective view showing a state in which the corner member shown in FIG. 11 is attached to a bottom frame. FIG. [Figure 13] FIG. 12 is a perspective view of the corner member shown in FIG. [Figure 14] FIG. 2 is an exploded perspective view of the bottom front side of the box. [Figure 15] FIG. 2 is a perspective view of the bottom front side of the box. [Figure 16] A perspective view of the underside of the bottom of the box. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] An embodiment of the present invention will be described below. The embodiment described below is a frame structure of a work box. As shown in FIG. 1, the frame structure of the box of the present invention is a rectangular parallelepiped structure in which 12 frames consisting of four vertical frames 10, four horizontal frames 11, and four depth frames 12 are joined together. An internal space is formed by attaching panels, doors, etc. to the front, back, left and right sides, top, and floor. Each frame is made of metal to ensure strength, but may be formed by extruding metal or bending a metal plate.

[0012] (Vertical frame) The vertical frame 10 is a frame that extends in the vertical direction of the box, and its upper and lower ends are connected to the horizontal frame 11 and the depth frame 12 as shown in Figure 2. Reference numeral 13 denotes corner members that cover the end faces of the vertical frame 10. The horizontal cross-sectional shape of the vertical frame 10 is approximately an eight shape as shown in Figure 3.

[0013] Reference numeral 14 denotes a first side that constitutes a corner of the outer periphery of the box. Second sides 15 are formed in a 45-degree direction from both ends of the first side 14, and these first and second sides 14 and 15 are outer sides that constitute the outer periphery of the box. A third side 16 is formed on the inside at an end of the second side 15 in a 90-degree direction. A first groove 17 is formed in at least one of these third sides 16.

[0014] A fourth side 18 is formed from the end of the third side 16 parallel to the second side 15, and a second groove 19 is formed in the fourth side 18. A fifth side 20 is formed from the end of the fourth side 18 in a direction at 90 degrees to be parallel to the third side 16, and a third groove 21 is formed in the fifth side 20.

[0015] At the end of the fifth side 20, a sixth side 22 and a seventh side 23 are formed in a 90-degree direction so as to be parallel to the second side 15 and the fourth side 18, and the two seventh sides 23 are connected at a right angle to form a corner of the inner space. Also, a fourth groove 24 is formed in the seventh side 23. The sixth side 22 and the seventh side 23 are inner sides facing the inner space of the box, and the fourth groove 24 is an attachment portion for attaching a member to be placed in the inner space of the box.

[0016] As shown in the figure, a connecting edge 25 parallel to the first edge 14 is formed at the connecting portion between the third edge 16 and the fourth edge 18, partitioning a first hollow space 26 surrounded by the first edge 14, the second edge 15 and the third edge 16, and a second hollow space 27 surrounded by the fourth edge 18, the fifth edge 20 and the seventh edge 23. A first mounting portion 28 having an arc shape is formed inside the first hollow space 26. The vertical frame 10 is an extruded material and has the same cross-sectional shape over its entire length.

[0017] (Horizontal and Depth Frames) The horizontal frame 11 and the depth frame 12 have the same cross-sectional shape as shown in FIG. 4. These are also extrusion-molded materials and have the same cross-sectional shape over their entire length. 30 is a first side that constitutes the outer shell of the box, such as the front, left and right sides, and back, and 31 is a second side formed in a 90-degree direction toward the inside of the box. A first groove 32 is formed in the second side 31. 33 is a third side formed from the end of the second side 31 in parallel to the first side 30, and a second groove 34 is formed in the third side 33. 35 is a fourth side formed from the end of the third side 33 in parallel to the second side 31, and a third groove 36 is formed. 37 is a fifth side formed in a 90-degree direction at the end of the fourth side 35, and 38 is a sixth side formed in a 90-degree direction at the end of the fifth side 37 and connected to the first side 30.

[0018] (Frame connection) 5 and 6 show the details of the connection between the frames. The vertical frame 10 and the horizontal frame 11, and the vertical frame 10 and the depth frame 12 abut at their ends and are connected by connecting fittings 40. The connecting fittings 40 are in the shape of a right triangle, and one orthogonal side abuts against the fifth side 20 of the vertical frame 10 and is fixed by a bolt 42 to a nut 41 fitted into the third groove 21 of the vertical frame 10. The other orthogonal side abuts against the third side 33 of the horizontal frame 11 / depth frame 12 and is fixed by a bolt 43 to a nut fitted into the second groove 34.

[0019] The end faces E10 of the vertical frames 10, which are formed by connecting the horizontal frames 11 and the depth frames 12 in this manner, are exposed as shown in Figures 5 and 6. Therefore, metal plate-shaped corner members 13 are provided at the connection points between the frames so as to cover the exposed end faces E10 of the vertical frames 10.

[0020] As shown in FIG. 7, when the vertical frame 10 is connected to the horizontal frame 11 and the depth frame 12, a step 391 is formed on the top side of the box between the upper end face E10 of the vertical frame 10 and a first horizontal plane H1 adjacent to the end face E10 and serving as the upper surface of the horizontal frame 11 and the depth frame 12. The first horizontal plane H1 is a plane formed by the side extending in the longitudinal direction of the horizontal frame 11 or the depth frame 12 and the sixth side 38. Similarly, on the bottom side of the box, a step 391 is formed between the lower end face E10 of the vertical frame 10 and the first horizontal plane H1 adjacent to the end face E10 and serving as the lower surface of the horizontal frame 11 and the depth frame 12. As shown in FIG. 2 and FIG. 7 to FIG. 9, the corner member 13 is stored and installed in the step 391. This allows the corner member 13 provided on the joined frames to have a box frame structure that does not protrude from the frames.

[0021] In this embodiment, the first horizontal plane H1 of the horizontal frame 11 and the depth frame 12 connected to the vertical frame 10 is located outside the adjacent end face E10. As a result, as shown in FIG. 7, on the top surface side of the box, the first horizontal plane H1 of the connected horizontal frame 11 and the depth frame 12 is higher than the upper end face E10 of the vertical frame 10. In the horizontal frame 11 and the depth frame 12, the cross section of the part protruding from the upper end face E10 (hereinafter referred to as the "protruding part 39") is a U-shaped part formed by a part of the first side 30 of the horizontal frame 11 and the depth frame 12 shown in FIG. 4, the fifth side 37 and the sixth side 38. At this time, a step part 391 is formed between the upper end face E10 of the vertical frame 10 and the first horizontal plane H1, which is the upper surface of the protruding part 39. The height of the step part 391, i.e., the height at which the protruding part 39 protrudes from the end of the vertical frame 10, is approximately the same as the length of the fifth side 37. This structure is the same on the bottom side of the box.

[0022] Here, the structure of the horizontal frame 11 and the depth frame 12 forming the step portion 391 of the embodiment will be described. As shown in FIG. 2, the horizontal frame 11 and the depth frame 12 include the above-mentioned first horizontal plane H1, the second horizontal plane H2 located at approximately the same height as the adjacent end face E10, and a vertical plane V connecting the first horizontal plane H1 and the second horizontal plane H2. The second horizontal plane H2 is a plane formed by a side extending in the longitudinal direction of the horizontal frame 11 or the depth frame 12 and the fourth side 35, and the vertical plane V is a plane formed by a side extending in the longitudinal direction of the horizontal frame 11 or the depth frame 12 and the fifth side 37. In other words, the step portion 391 is formed between the end face E10 of the vertical frame 10 and the second horizontal plane H2 of the horizontal frame 11 and the depth frame 12, and the first horizontal plane H1.

[0023] In such a frame structure, as shown in Figures 7 to 9, the corner member 13 on the top side is attached to the step portion 391 at a position above the upper end face E10 of the vertical frame 10 and above the second horizontal plane H2 of the horizontal frame 11 and the depth frame 12. The corner member on the bottom side is attached to the step portion 391 at a position below the lower end face E10 of the vertical frame 10 and below the second horizontal plane H2 of the horizontal frame 11 and the depth frame 12.

[0024] The thickness of the corner member 13 in this embodiment is approximately the same as the length of the fifth side 37 of the horizontal frame 11 and the depth frame 12, and therefore is approximately the same as the step at the step portion 391. Therefore, the upper surface of the corner member 13 on the top side installed at the above-mentioned position is flush with the first horizontal plane H1, which is the upper surface of the horizontal frame 11 and the depth frame 12, as shown in Fig. 9. This configuration is preferable because the surface formed by the upper surface of the corner member 13 and the upper surfaces of the horizontal frame 11 and the depth frame 12 is flush. It is preferable that the same structure is also used on the bottom side of the box.

[0025] Moreover, when the corner member 13 is stored in the step portion 391, it is preferable that the end face of the corner member 13 abuts against the vertical plane V. Here, the end face of the corner member 13 abutting against the vertical plane V refers to the plane formed by the side of the corner member 13 extending in the thickness direction and the fourth side 134 shown in FIG. 10 (the structure of the corner member 13 will be described in detail in the next paragraph). The end face of the corner member 13 abuts against the vertical plane V of the horizontal frame 11, thereby increasing the strength of the box against loads in the front and back directions. Furthermore, the end face of the corner member 13 abuts against the vertical plane V of the depth frame 12, thereby increasing the strength of the box against loads in the left-right direction.

[0026] (Corner parts) Here, the corner member 13 of the embodiment will be described. As shown in Fig. 10, the corner member 13 of the present embodiment has a first side 131 that constitutes a corner of the outer contour of the box, and has a shape that is line-symmetrical with respect to a line that passes through the center of the first side 131 and is perpendicular to the first side 131. Furthermore, the first side 131 has approximately the same length as the first side 14 of the vertical frame 10, so that the end of the first side 131 and the end of the first side 14 are aligned when joined together.

[0027] A second side 132 is formed in a direction of approximately 45 degrees from the end of the first side 131, and these first side 131 and second side 132 form the outer contour of the box. In addition, since the second side 132 has approximately the same length as the second side 15 of the vertical frame 10, the end of the second side 132 and the end of the second side 15 are aligned when joined.

[0028] A third side 133 is formed from the end of the second side 132 in a direction of 90 degrees toward the inside of the box when installed. As shown in Fig. 2, the third side 133 abuts against the end face of the horizontal frame 11 or the depth frame 12 when installed. In addition, since the third side 133 has approximately the same length as the sixth side 38 of the horizontal frame 11 and the depth frame 12, when joined, the second side 132 and the outer long side of the first horizontal plane H1 are aligned in a straight line.

[0029] A fourth side 134 is formed in a direction approximately 90 degrees from the end of the third side 133 so as to be parallel to the second side 132. The fourth side 134 abuts against the vertical plane V of the horizontal frame 11 and the depth frame 12.

[0030] A fifth side 135 is formed in a direction of about 90 degrees from the end of the fourth side 134 so as to be parallel to the third side 133. The fifth side 135 has approximately the same length as the fourth side 35 of the horizontal frame 11 and the depth frame 12.

[0031] A sixth side 136 is formed in a direction of about 90 degrees from the end of the fifth side 135 so as to be parallel to the fourth side 134. A seventh side 137 is formed in a direction of about 90 degrees from the end of the sixth side 136 so as to be parallel to the fifth side 135. The seventh side 137 has approximately the same length as the fifth side 20 of the vertical frame 10. An eighth side 138 is formed in a direction of about 90 degrees from the end of the seventh side 137 so as to be parallel to the sixth side 136. The eighth side 138 has approximately the same length as the seventh side 23 of the vertical frame 10. The two eighth sides 138 are connected at right angles.

[0032] As shown in Fig. 10, a plurality of mounting holes are formed in the corner member 13. As shown in Fig. 5, the first mounting hole 44 corresponds to the first mounting portion 28 of the vertical frame 10, and is fixed by a bolt 441. The second mounting hole 45 and the third mounting hole 46 are fixed by bolts 451, 461 to nuts housed in the third groove 36 of the horizontal frame 11 or the depth frame 12. The fourth mounting hole 47 has a nut welded to its back surface, and this nut is located within the second mounting space 27 of the vertical frame 10.

[0033] An eyebolt having a ring-shaped head and shaft can be attached to the fourth mounting hole 47, and can be used to hoist the box when transporting it. The eyebolt can be inserted into the fourth mounting hole 47 of the corner member 13 attached to the top side of the box, and a chain, rope, or the like can be fastened to the eyebolt, allowing the box to be suspended for transportation. In other words, an eyebolt can be attached to the fourth mounting hole 47 as a functional member that adds the function of enabling the box to be suspended for transportation.

[0034] Furthermore, in the frame structure of the present invention, it is possible to use a corner member 50 having a shape different from the above-mentioned corner member 13. In the embodiment, the corner member 50 is used as a corner member for the bottom surface.

[0035] 11 has a first side 511 that constitutes the corner of the outer shell of the box. The first side 511 has approximately the same length as the first side 14 of the vertical frame 10, so that the end of the first side 511 and the end of the first side 14 are aligned when joined.

[0036] A second side 512 is formed in a direction of approximately 45 degrees from one end of the first side 511. In addition, the second side 512 has approximately the same length as the second side 15 of the vertical frame 10, so that the end of the second side 512 and the end of the second side 15 are aligned when joined.

[0037] A third side 513 is formed from the end of the second side 512 in a direction of 90 degrees toward the inside of the box when installed. As shown in Fig. 12, the third side 513 abuts against the end face of the horizontal frame 11 or the depth frame 12 when installed. In addition, since the third side 513 has approximately the same length as the sixth side 38 of the horizontal frame 11 and the depth frame 12, when joined, the second side 512 and the outer long side of the first horizontal plane H1 are aligned in a straight line.

[0038] A fourth side 514 that connects the ends of the third sides 513 is formed at the ends of the third sides 513 and is parallel to the second side 512. The fourth side 514 abuts against the vertical plane V of the horizontal frame 11 or the depth frame 12. The fourth side 514 is formed to have a length substantially equal to the length of the horizontal frame 11 or the depth frame 12 in the longitudinal direction.

[0039] A fifth side 515 is formed in a direction of approximately 45 degrees from the other end of the first side 511, and the first side 511, second side 512, and fifth side 515 form the outer contour of the box. In addition, the fifth side 515 has approximately the same length as the second side 15 of the vertical frame 10, so that the end of the fifth side 515 and the end of the second side 15 are aligned when joined.

[0040] A sixth side 516 is formed from the end of the fifth side 515 in a direction of 90 degrees toward the inside of the box when installed. As shown in Fig. 12, the sixth side 516 abuts against the end face of the horizontal frame 11 or the depth frame 12 when installed. In addition, since the sixth side 516 has approximately the same length as the sixth side 38 of the horizontal frame 11 and the depth frame 12, when joined, the fifth side 515 and the outer long side of the first horizontal plane H1 are aligned in a straight line.

[0041] A seventh side 517 is formed in a direction of approximately 90 degrees from the end of the sixth side 516 so as to be parallel to the fifth side 515. The seventh side 517 abuts against the vertical surface V of the horizontal frame 11 or the depth frame 12.

[0042] An eighth side 518 is formed in a direction of about 90 degrees from the end of seventh side 517 so as to be parallel to sixth side 516. A ninth side 519 is formed in a direction of about 90 degrees from the end of eighth side 518 so as to be parallel to seventh side 517.

[0043] A tenth side 520 that connects the ends of the ninth side 519 is formed at the end of the ninth side 519 and is parallel to the eighth side 518. As shown in Fig. 13, the tenth side 520 is bent in a direction such that substantially the entire length of the tenth side 520 is inside the box when mounted to form a first surface 521, and the first surface 521 is further bent in the direction of the fourth side 514 to form a second surface 522. A mounting hole 523 is formed in the second surface 522 for fixing the bottom panel with a screw or the like.

[0044] As shown in Fig. 11, the corner member 50 has a plurality of mounting holes formed therein. The first mounting hole 54 corresponds to the first mounting portion 28 of the vertical frame 10 and is fixed with a bolt. The second mounting hole 55 and the third mounting hole 56 are fixed with a bolt to a nut housed in the third groove 36 of the horizontal frame 11 or the depth frame 12. Fifth mounting holes 58 are provided at positions facing some of the third mounting holes 56, and casters 7 can be fixed to the two third mounting holes 56 and the two fifth mounting holes 58.

[0045] In addition, the fourth mounting hole 57 has a nut welded to its back surface, and this nut is located in the second mounting space 27 of the vertical frame 10. The fourth mounting hole 57 can be fitted with an adjuster 6 for fixing the box to the installation surface. In the embodiment, the box is configured to be easily moved by the caster 7 provided on the corner member 50 on the bottom side, and after the box is moved to the installation location, the height of the adjuster 6 attached to the fourth mounting hole 47 of the corner member 50 can be adjusted to fix the box to the installation location. In other words, the fourth mounting hole 57 can be fitted with the adjuster 6 as a functional member that adds the function of fixing the box to the installation location. In this way, by making it possible to attach functional members such as eye bolts and adjusters that add functions to the box to the fourth mounting holes 47, 57 of the corner members 13, 50, a new function can be added to the box by using the corner members 13, 50 that join the vertical frame, the horizontal frame, and the depth frame.

[0046] Next, the attachment of the corner members 50 will be described. As shown in Fig. 12, the corner members 50 are arranged across multiple corners and are stored and attached between the vertical surfaces V and V of the opposing horizontal frames 11, or between the vertical surfaces V and V of the opposing depth frames 12. In the embodiment shown in Fig. 12, the corner members 50 are provided on the bottom surface side. The corner members 50 provided on the floor surface side act as beams and can support the load on the floor surface.

[0047] As shown in FIG. 12, when the corner member 50 on the bottom side is stored between the vertical surfaces V of the opposing depth frames 12, the end face of the corner member 50 abuts the vertical surface V of the horizontal frame 11 over substantially the entire length in the longitudinal direction, and also abuts the vertical surfaces V of the two opposing depth frames 12. In this case, in the corner member 50 of the embodiment, the end face abutting the vertical surface V of the horizontal frame 11 is a surface formed by the side extending in the thickness direction of the corner member 50 and the fourth side 514. In this way, the end face of the corner member 50 abuts the vertical surface V of the horizontal frame 11 over substantially the entire length in the longitudinal direction, so that the strength against loads in the front and back directions can be further increased compared to the above-mentioned corner member 13. In addition, in the corner member 50 of the embodiment, the end face abutting each vertical surface V of the depth frame 12 is a surface formed by the side extending in the thickness direction of the corner member 50 and the seventh side 517. In this way, by the end faces of the corner members 50 abutting against the respective vertical faces V of the opposing depth frame 12, it is possible to further increase the strength against loads in the left and right direction compared to the corner members 13 described above.

[0048] The corner members 50 are not limited to the above-mentioned configuration, and may be provided by being housed between the vertical faces V of the horizontal frames 11 facing each other.

[0049] Similarly to the corner members 13, the corner members 50 on the bottom side are also installed by being stored in a step portion 391 formed between the lower end face E10 of the vertical frame 10 and the first horizontal plane H1 that is adjacent to this end face E10 and forms the lower faces of the horizontal frame 11 and the depth frame 12. This makes it possible to achieve a box frame structure in which the corner members 50 provided on the joined frames do not protrude from the frames.

[0050] (Floor structure) Next, the structure of the floor surface in the embodiment will be described. As shown in Figs. 14 to 16, the floor surface of the box in this embodiment is a floor surface frame frame composed of two horizontal frames 11 and two depth frames 12, to which floor surface panels 61, 62 are attached. At this time, the floor surface panels 61, 62 are fixed to the corner member 50 by bolts or the like through the mounting holes 63 of the floor surface panels 61, 62 and the mounting holes 523 of the corner member 50. Although the floor surface panel may be one piece, it is preferable to use the floor surface panels 61, 62 composed of two pieces as in this embodiment, since this improves the workability of attachment and removal.

[0051] In the embodiment, the floor panel 61 has a slit 611 for drawing air from the floor into the box. In addition, a restricting edge 612 is provided on the floor panel 62 side of the floor panel 61, which fits under the floor panel 62 when the floor panels 61, 62 are attached to the floor frame. The restricting edge 612 determines the order of attachment and removal of the floor panels 61, 62. In other words, when attaching, the floor panel 61 is attached followed by the floor panel 62, and when removing, the floor panel 62 is removed followed by the floor panel 61.

[0052] 16, a plate 64 may be provided on the back side of the floor panel 61 to prevent dust and dirt from entering through the slits 611. Also, a beam 65 may be provided on the back side of the floor panels 61, 62 to maintain the strength of the floor surface so as to span across the opposing horizontal frames 11 or depth frames 12, or across the opposing corner members 50.

[0053] Although the present invention has been described above by taking the embodiment as an example, the present invention is not limited to the above embodiment and can be embodied in various forms. [Explanation of symbols]

[0054] 10 Vertical Frame E10 end face 11 Horizontal frame 12 Depth Frame H1 1st horizontal plane H2 2nd horizontal plane V vertical plane 13 Corner parts 39 Protrusion 391 Step 50 Corner parts 6 Adjuster 7 Caster

Claims

1. A box frame structure in which vertical frames, horizontal frames, and depth frames that form the skeleton of the box are joined by corner members arranged at the corners, The end faces of the horizontal frame and the end faces of the depth frame are in contact with the side faces of the vertical frame, The outer surfaces of the horizontal and depth frames that face outward in the height direction of the box are a first horizontal surface located outside an end surface of the vertical frame in a height direction; A second horizontal surface located at approximately the same height as the end surface of the vertical frame; A vertical surface is formed connecting the first horizontal surface and the second horizontal surface, The corner members are A box frame structure characterized in that the corner members are housed in a step portion formed between the end faces of the vertical frames and the second horizontal plane and the first horizontal plane, and the end faces of the corner members abut the vertical plane.

2. A box frame structure as described in claim 1, characterized in that the thickness of the corner member is the same as the height of the step portion.

3. A frame structure of a box as described in claim 1 or 2, characterized in that the corner members are arranged across multiple corner portions and stored between the vertical surfaces of opposing horizontal frames or between the vertical surfaces of opposing depth frames.

4. A mounting hole is formed in the corner member, A box frame structure as described in any one of claims 1 to 3, characterized in that a functional member is attached to this mounting hole to add the function of allowing the box to be hung and transported, or the function of allowing the box to be fixed to an installation location.

5. 5. A box frame structure according to claim 1, wherein the corner members are plate-shaped members.

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