GB2604659A

GB2604659A - Storage Basket

Info

Publication number: GB2604659A
Application number: GB2103993.8A
Authority: GB
Inventors: Cao Guohua
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-03-08
Filing date: 2021-03-23
Publication date: 2022-09-14
Anticipated expiration: 2041-03-23
Also published as: DE202021101491U1; FR3120358B3; GB202103993D0; US20220281634A1; FR3120358A3; CN215044542U; JP3232841U; GB2604659B

Abstract

A storage basket includes a side frame 1 and a bottom plate 2, which are of an integrated structure or split-type structures. An outer edge of the top of the side frame has an outer frame 111 with gaps (1111, fig. 10) formed in all of its bends. Corner protectors 3 are wrapped on at least one bend of the side frame. The top of each corner protector has a bent portion 31 that is bent towards the inner side of the side frame or the outer side of the side frame and covers the gap. This enhances the rigidity of the basket and solves the technical problem that the outer frame at the top of a storage basket can deform or break when the basket is made into a taper. Side plates 11 may be connected to each other end to end by means of the corner protectors such that the outer frame is arranged at the outer edges of the tops of the side plates, and the side plates and corner protectors are connected through welding, fastening hooks or plug-in structures.

Description

STORAGE BASKET

TECHNICAL FIELD

[0001] The present disclosure relates to the field of storage baskets.

BACKGROUND

[0002] A storage basket is a basket that is convenient for storing objects. When there are too many storage baskets in a room, there is a need for slacking the plurality of storage baskets. As shown in Fig. 1. in order to realize a function for stacking the plurality of storage baskets, each storage basket 01 is usually made into a tapered structure with an outer frame 111 at the top larger than the bottom. Of course, the plurality of storage baskets 01 can also be made into stacked structures that have contour dimensions sequentially increased from top to bottom. On the one hand, the protruding outer frames 111 play a supporting and reinforcing role, and on the other hand, when a plurality of storage baskets are stacked, the protruding outer frames 111 also play a role of limiting each storage basket. However, when the storage basket is made into a taper, a bend or a non-bend of the outer frame 111 is not uniformly stressed, which may cause the outer frame 111 to deform or break easily, especially for baskets with greater heights. The outer frame 111 almost always breaks when the basket is made into the taper. Therefore, the structure of the basket needs to be improved.

SUMMARY

[0003] The present disclosure is directed to overcome the above defects in the prior art, a storage basket is provided to solve the technical problem that an outer frame at the top of the storage basket deforms or breaks when the storage basket is made into a taper.

[0004] In order to achieve the above objective, the present disclosure provides a storage basket, including a side frame and a bottom plate arranged at the bottom of the side frame. The side frame and the bottom plate are of an integrated structure or split-type structures; an outer edge of the top of the side frame is provided with an outer frame; gaps are formed in all bends of the outer frame; a corner protector is wrapped on at least one bend of the side frame; the top of each corner protector has a bent portion that is bent towards the inner side of the side frame or the outer side of the side frame and covers the gap.

[0005] Preferably, the side frame includes a plurality of side plates connected to each other end to end by means of the corner protectors; the side plates and the bottom plate are of an integrated structure or split-type structures; the outer frame is arranged at the outer edges of the tops of the plurality of side plates; and the side plates and the corner protectors are connected through welding, fastening hook type structures or plug-in type structures.

[0006] Preferably, the side frame is formed by bending and splicing at least one side plate; at least one splicing opening is formed in each side plate; the bottom of each side plate is provided with an inner flanging; each side plate and the bottom plate are of split-type structures; the bottom plate is carried on the inner flanging; the outer frame is arranged at the outer edge of the top of each side plate; and at least one incision is arranged on the inner flanging.

[0007] Preferably, the storage basket further includes metal connecting components, and the metal connecting components are attached to inner walls and outer walls of the splicing openings.

[0008] Preferably, each metal connecting component includes a first metal sheet attached to the inner wall of the splicing opening, and a second metal sheet attached to the outer wall of the splicing opening.

[0009] Preferably, each metal connecting component is a third metal sheet with a "Z"-shaped cross section; the third metal sheet includes a first notch and a second notch; the side plate at one end of the splicing opening is plugged into the first notch; and the side plate at the other end of the splicing opening is plugged into the second notch.

[0010] Preferably, the storage basket further includes a fourth metal sheet with a "Z"-shaped longitudinal section; the bottom of each side plate is provided with an inner flanging; the fourth metal sheet is an independently formed member or is integrated with the inner flangings; the fourth metal sheet includes a third notch and a fourth notch; when the fourth metal sheet is the independently formed member, the inner flangings are plugged into the third notch, and correspondingly, the bottom plate is plugged into the fourth notch; or the inner flangings are plugged into the fourth notch, and correspondingly, the bottom plate is plugged into the third notch; and when the fourth metal sheet is integrated with the inner flangings, the bottom plate is plugged into the fourth notch.

[0011] Preferably, the side frame is of a solid sheet metal structure, or a plate net of any mesh stretching structure, a meshed structure, or a stretching sheet metal structure with any mesh in the middle.

[0012] Preferably, two ends of the side plate are provided with first fastening hooks; two ends of the corner protector are provided with second fastening hooks; and the first fastening hooks and the second fastening hooks are clamped to cause the side plate to be connected to the corner protector.

[0013] Preferably, two ends of the bent portion are provided with plug-in holes, and correspondingly, two ends of the outer frame are provided with plug-in portions matched with the plug-in holes; [0014] or, two ends of the outer frame are provided with plug-in holes, and correspondingly, the bent portion is provided with plug-in portions matched with the plug-in holes; and two ends of the bottom of the side plate or two ends of the bottom of the corner protector are provided with avoiding gaps.

[0015] Compared with the prior art, the storage basket provided by the present disclosure has the beneficial effects: [0016] The storage basket is provided with the gaps in the outer frame, so that when the outer frame is expanded to cause the storage basket to be a taper with a large upper part and a small lower part, no matter how great the height dimension of the storage basket, the outer frame at the outer edge of the top of the side frame would be stressed uniformly and may not deform or break, ensuring the aesthetics and the production quality of the storage basket. After the storage basket is formed into the taper, the bent portions at the tops of the corner protectors close the gaps in the outer frame, further improving the aesthetic measure of the storage basket of this technical solution. By the adoption of the technical solution, the rigidity intensity of the storage basket is improved, and the production efficiency of the tapered storage basket can be also greatly improved; and moreover, various decorative patterns can be stamped on the outer walls of the corner protectors to further improve the aesthetic measure of the storage basket.

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] To describe the embodiments of the present disclosure or the technical solutions in the prior art more clearly, drawings required to be used in the embodiments or the illustration of the existing art will be briefly introduced below. Obviously, the drawings in the illustration below are some embodiments of the present disclosure. Those ordinarily skilled in the art also can acquire other drawings according to the provided drawings without doing creative work.

[0018] Fig. 1 is a schematic structural diagram of stacking placement of a plurality of storage baskets in the prior art; [0019] Fig. 2 is a schematic structural diagram of Embodiment I; [0020] Fig. 3 is a schematic structural diagram of Embodiment I without comer protectors; [0021] Fig. 4 is a schematic structural diagram illustrating that a side frame is formed by splicing a plurality of side plates in Embodiment I; [0022] Fig. 5 is another schematic structural diagram of Embodiment I; [0023] Fig. 6 is another schematic structural diagram of Embodiment I; [0024] Fig. 7 is a schematic diagram of a first longitudinal section of a corner protector in Embodiment I; [0025] Fig. 8 is a schematic diagram of a second longitudinal section of a corner protector in Embodiment I; [0026] Fig. 9 is a schematic diagram of a third longitudinal section of a corner protector in Embodiment I; [0027] Fig. 10 is a first structural exploded diagram illustrating that a side frame is formed by splicing a plurality of side plates to a front side plate and corner protectors in Embodiment I; [0028] Fig. 11 is a schematic diagram of a fourth longitudinal section of a corner protector in Embodiment I; [0029] Fig. 12 is a schematic diagram of a fifth longitudinal section of a corner protector in Embodiment I; [0030] Fig. 13 is a second structural exploded diagram illustrating that a side frame is formed by splicing a plurality of side plates to a front side plate and corner protectors in Embodiment I; [0031] Fig. 14 is a schematic structural diagram of Embodiment II without corner protectors; [0032] Fig. 15 is a schematic structural diagram of a metal connecting component added in Embodiment 11; [0033] Fig. 16 is a schematic structural diagram of a metal connecting component of a first type added in Embodiment II; [0034] Fig. 17 is an exploded diagram of a metal connecting component of a second type added in Embodiment II; [0035] Fig. 18 is a schematic structural diagram of Embodiment III; [0036] Fig. 19 is a schematic structural diagram of Embodiment III at another angle; [0037] Fig. 20 is a planar schematic diagram of a fourth metal sheet in Embodiment 111; and [0038] FIG. 21 is a cutaway view of a position A-A in FIG. 20.

DESCRIPTION OF THE EMBODIMENTS

[0039] In order to make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be described clearly and completely below in combination with the drawings in the embodiments of the present disclosure. Obviously, the embodiments described are part of the embodiments of the present disclosure, not all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within die protection scope of the present

disclosure.

[0040] Embodiment I [0041] As shown in Fig. 2 and Fig. 3, the present embodiment provides a storage basket. The present embodiment mainly solves the technical problem that an outer frame at the top of the storage basket deforms or breaks when the storage basket is made into a taper. The storage basket includes a side frame I. a bottom plate 2, and corner protectors 3.

[0042] An outer edge of the top of the side frame 1 is provided with an outer frame 111; gaps 1111 are formed in all bends of the outer frame 111; a corner protector 3 is wrapped on at least one bend of the side frame 1; the top of each corner protector 3 has a bent portion 31 that is bent towards the inner side of the side frame 1 or the outer side of the side frame 1 and covers the gap 1111. Specifically, the bent portions 31 may be bent from outside to inside to be wrapped on the outer frame 111 at the top of the side frame 1, and the bent portions 31 may also be bent towards the outer side of the side frame 1 and flush with the outer frame 111 at the top of the side frame 1.

[0043] Specifically, the storage basket is provided with the gaps 1111 in the outer frame 111, so that when the outer frame 111 is expanded to cause the storage basket to be a taper with a large upper part and a small lower part, no matter how great the height dimension of the storage basket, the outer frame 111 at the outer edge of the top of the side frame 1 would be stressed uniformly and may not deform or break, ensuring the aesthetics and the production quality of the storage basket. After the storage basket is formed into the taper, the bent portions 31 of the tops of the corner protectors 3 close the gaps 1111 in the outer frame 111, further improving the aesthetic measure of the storage basket of this technical solution. By the adoption of the technical solution, the rigidity intensity of the storage basket is improved, and the production efficiency of the tapered storage basket can be also greatly improved; and moreover, various decorative patterns can be punched on the outer walls of the corner protectors 3, further improving the aesthetic measure of the storage basket.

[0044] As shown in Fig. 4 and Fig. 5, the side frame 1 includes a plurality of side plates 11 connected to each other end to end by means of the corner protectors 3; the side plates 11 and the bottom plate 2 are of an integrated structure or split-type structures; and the outer frame 111 5 is arranged at the outer edges of the tops of the plurality of side plates 11. By means of such a structural design for the side frame 1, the plurality of side plates 11 may be connected end to end through the corner protectors 3 to form the tapered storage basket. Of course, in such a structure, the bent portions 31 at the tops of the corner protectors 3 are preferably designed into a shape bent from inside to outside. Specifically, the corner protectors 3 may be in fastening connection to the side plates 11 in a welding manner or through fastening hook type structures as shown in Fig. 10. The side plates 11 extend to the outer side to form first fastening hooks 114 that are bent, and two ends of the corner protectors 3 also extend out to form second fastening hooks 34. The first fastening hooks 114 and the second fastening hooks 34 are mutually fastened and flattened to realize fastening connection between the side plates 11 and the corner protectors 3. This structure does not need to be welded, so that the production efficiency of the storage basket is greatly improved. In addition, a second type of plug-in type structure may also be used between the corner protectors 3 and the side plates 11. Specifically, as shown in Fig. 11 and Fig. 12, the shape of the bent portion 31 is the same as the shape of the outer frame 111.

Both of the bent portions 31 are flanged from inside to outside. As shown in Fig. 13, two ends of the bent portion 31 are provided with plug-in portions 311, and two ends of a corner protector bottom 33 are provided with avoiding gaps 331. When the corner protectors 3 and the side plates 11 are spliced, the plug-in portions 311 are plugged into plug-in holes 1112 of the outer frame 111 at the tops of the side plates 11. The avoiding gaps 331 avoid the problem of interference between the corner protector bottoms 33 and inner flangings 113 at the bottoms of the side plates 11. Of course, the plug-in portions 311 may also be arranged at the tail end of the outer frame 111, and correspondingly, the plug-in holes 1112 are formed in the bent portions 31. Of course, two ends of the corner protector bottoms 33 may not be provided with avoiding gaps 331, either, and the avoiding gaps 331 are formed in the inner tlangings 113 at the bottoms of the side plates 11. By the adoption of the second type of plug-in type structure, the storage basket has the advantages of convenience in assembling and high production efficiency.

[0045] Specifically, the side frame 1 and the bottom plate 2 are of an integrated structure or split-type structures. The side frame 1 or the corner protectors 3 is or are of a solid sheet metal structure, or a plate net of any mesh stretching structure, a meshed structure, or a stretching sheet metal structure with any mesh in the middle, or may be a plastic plate or a wooden plate.

The bottom plate 2 is of a flat plate type metal structure, a screen stretching metal structure, a wooden plate, or glass. As shown in Fig. 2, Fig. 3 or Fig. 4, the side frame 1 provided with a mesh for stretching in the middle and the bottom plate 2 of the screen stretching structure are of the split-type structures. As shown in Fig. 5, the side frame 1 of the meshed stretching structure and the bottom plate 2 of the screen stretching structure are integrated. As shown in Fig. 6, the side frame 1 of the solid sheet metal structure and the bottom plate 2 of the screen stretching structure are split-type structures. In addition, a plurality of convex points are arranged on outer walls of the corner protectors 3 in Fig. 6 to play a role of decoration to improve the aesthetic measure of the storage basket.

[0046] More specifically, the shape of the longitudinal section of the corner protector 3 is matched with the longitudinal section shape of one of the side plates 11 on the side frame 1. Fig. 7 illustrates a first shape of the longitudinal section of the corner protector 3. The corner protector 3 includes the bent portion 31 and a corner protector middle 32. Specifically, the bent portion 31 is bent from inside to outside or from outside to inside and covers the gap 1111 in the outer frame Ill. The corner protector middle 32 is attached to the outer wall of the side plate 11.

When the bottom of the side plate 11 is not provided with the inner flanging 113, the corner protector 3 further includes a corner protector bottom 33. On the contrary, when the bottom of the side plate 11 is provided with the inner flanging 113, the comer protector 3 may have no corner protector bottom 33. Fig. 8 illustrates a second shape of the longitudinal section of the corner protector 3. Fig. 9 illustrates a third shape of the longitudinal section of the corner protector 3.

[0047] As shown in Fig. 2, a corner at the position A of the corner protector 3 may be any angle, such as a right angle, a filleted corner or an R angle. Specifically, the bent portion 31 is folded into a right angle or an R angle towards a bayonet.

[0048] Embodiment II [0049] As shown in Fig. 14, the present embodiment provides a second storage basket. The present embodiment is based on that the side frame 1 is formed by bending and splicing at least one side plates 11. In this structure, preferably, the bent portion 31 at the top of the corner protector 3 is designed into a structure that is bent from outside to inside. Therefore, at least one splicing opening 112 would be formed in each side plate 11. In the present embodiment, the side frame 1 is preferably formed by bending and splicing two side plates 11. Therefore, two splicing openings 112 are formed in the side plates 11. In addition, the bottoms of the side plates 11 are provided with inner Hangings 113. Other structures are the same as those in Embodiment I. and no more repeated descriptions are provided.

[0050] The side plates 11 and the bottom plate 2 are of split-type structures, and the bottom plate 2 is carried on the inner flangings 113. The outer frame 111 is arranged at outer edges of the tops of the side plates 11. At least one incision 1131 is formed in each inner flanging 113. The incisions 1131 are set to cause the inner Hangings 113 to have a certain deformation during expansion of the storage basket, thereby avoiding a phenomenon of deformation or breakage of the inner flangings 113.

[0051] As shown in Fig. 15 and Fig. 16, in the present embodiment, the storage basket further includes metal connecting components 4. The metal connecting components 4 are attached to inner walls and outer walls of the splicing openings 112.

[0052] Specifically, each metal connecting component 4 includes a first metal sheet 41 attached to the inner wall of the splicing opening 112, and a second metal sheet 42 attached to the outer wall of each splicing opening 112. During production, the splicing openings 112 of the side plates 11 can be extremely firm and would not break by attaching the first metal sheets 41 to the inner walls of the splicing openings 112 for welding and attaching the second metal sheets 42 to the outer walls of the splicing openings 112 for welding, thereby guaranteeing the reliability of a product. During working, two ends of the side plates 11 at the splicing openings 112 no longer need to be tediously aligned. The production process of the product can be simplified by means of setting the metal connecting components 4, and the production efficiency of the product is greatly improved. In addition, due to the arrangement of the metal connecting components 4. the inner walls and the outer walls of the splicing openings 112 are perfectly smooth and flat, and may not cut hands of a user. Furthermore, the quantity of original welding spots is greatly reduced, the appearance of the product is greatly upgraded, and the purchasing desire of the user is enhanced.

[0053] In addition, as shown in Fig. 15 and Fig. 17, each metal connecting component 4 may also be a third metal sheet 43 with a "Z"-shaped cross section. Each third metal sheet 43 includes a first notch 431 and a second notch 432. During production, the splicing openings 112 of the side plates 11 can be extremely firm and would not break by plugging the side plates 11 on one sides of the splicing openings 112 into the first notches 431, plugging the side plates 11 on the other sides of the splicing openings 112 into the second notches 432, and finally flattening the "Z"-shaped third metal sheets 43, thereby guaranteeing the reliability of a product.

During working, two ends of the side plates 11 at the splicing openings 112 no longer need to be tediously aligned. The production process of the product can be simplified by means of setting the third metal sheets 43, and the production efficiency of the product is greatly improved. In addition, due to the arrangement of the third metal sheets 43, the inner walls and the outer walls of the splicing openings 112 are perfectly smooth and flat, and may not cut hands of a user.

Furthermore, the quantity of original welding spots is greatly reduced, the appearance of the product is greatly upgraded, and the purchasing desire of the user is enhanced.

[0054] Embodiment III [0055] As shown in Fig. 18 to Fig. 21, the present embodiment provides a third storage basket.

The present embodiment mainly solves the problem of how to connect the inner Hangings to the bottom plate more reliably and attractively. The storage basket further includes a fourth metal sheet 5 with a "Z"-shaped longitudinal section. The fourth metal sheet 5 is an independently formed member or is integrated with the inner Hangings 113; and the fourth metal sheet 5 includes a third notch 51 and a fourth notch 52. Other structures are the same as those in Embodiment I or II, and no more repeated descriptions are provided.

[0056] During production, the bottom plate 2 is generally welded on surfaces of the inner Hangings 113 in the prior art, so a large number of welding spots would occur. On the one hand, these welding spots are easy to break, and have the defect of low reliability, and on the other hand, the large number of welding spots severely affect the appearance of the product.

Therefore, the present embodiment is provided with the "Z"-shaped fourth metal sheet 5. During production, when the fourth metal sheet 5 is an independently formed member, the inner flangings 113 are plugged into the third notch 51, and correspondingly, the bottom plate 2 is plugged into the fourth notch 52; or the inner Hangings 113 are plugged into the fourth notch 52, and correspondingly, the bottom plate 2 is plugged into the third notch 51; and the "Z"-shaped fourth metal sheet 5 is flattened to make the connection between the inner Hangings 113 and the bottom plate 2 extremely firm and would not break, guaranteeing the reliability of the product; and when the fourth metal sheet 5 is integrated with the inner flangings 113, the bottom plate 2 is plugged into the fourth notch 52. In addition, due to the arrangement of the fourth metal sheet 5, the inner walls and the outer walls of the inner Hangings 113 can be perfectly smooth and flat, and have no welding spots on the surfaces, thereby greatly improving the appearance of the product and enhancing the purchasing desire of the user.

[0057] One gap may also be at least formed in the top of each side plate 11 to meet the requirement for producing a large-size storage basket.

[0058] The above-mentioned embodiments are preferred implementation modes of the present disclosure, but the implementation modes of the present disclosure are not limited by the above-mentioned embodiments, and any other changes, modifications, substitutions, combinations, and simplifications that are made without departing from the spirit and principle of the present disclosure shall all be equivalent replacement methods, which all fall within the

protection scope of the present disclosure.

Claims

Claims WHAT IS CLAIMED IS: 1. A storage basket, comprising a side frame (1) and a bottom plate (2) arranged at the bottom of the side frame (1), wherein the side frame (1) and the bottom plate (2) are of an integrated structure or split-type structures; an outer edge of the top of the side frame (1) is provided with an outer frame (111); gaps (1111) are formed in all bends of the outer frame (111); a corner protector (3) is wrapped on at least one bend of the side frame (1); the top of each corner protector (3) has a bent portion (31) that is bent towards the inner side of the side frame (1) or the outer side of the side frame (1) and covers the gap (1111).
2. The storage basket according to claim 1, wherein the side frame (1) comprises a plurality of side plates (11) connected to each other end to end by means of the corner protectors (3); the side plates (11) and the bottom plate (2) are of an integrated structure or split-type structures; the outer frame (111) is arranged at the outer edges of the tops of the plurality of side plates (11); and the side plates (11) and the corner protectors (3) are connected through welding, fastening hook type structures or plug-in type structures.
3. The storage basket according to claim 1, wherein the side frame (1) is formed by bending and splicing at least one side plate (11); at least one splicing opening (112) is formed in each side plate (11); the bottom of each side plate (11) is provided with an inner flanging (113); each side plate (11) and the bottom plate (2) are of split-type structures; the bottom plate (2) is carried on the inner flanging (113); the outer frame (111) is arranged at the outer edge of the top of each side plate (11); and at least one incision (1131) is arranged on the inner flanging (113).
4. The storage basket according to claim 3, further comprising metal connecting components (4), wherein the metal connecting components (4) are attached to inner walls and outer walls of the splicing openings (112).
5. The storage basket according to claim 4 wherein each metal connecting component (4) comprises a first metal sheet (41) attached to the inner wall of the splicing opening (112), and a second metal sheet (42) attached to the outer wall of the splicing opening (112).
6. The storage basket according to claim 4, wherein each metal connecting component (4) is a third metal sheet (43) with a "Z"-shaped cross section; the third metal sheet (43) comprises a first notch (431) and a second notch (432); the side plate (11) at one end of the splicing opening (112) is plugged into the first notch (431); and the side plate (11) at the other end of the splicing 10 opening (112) is plugged into the second notch (432).
7. The storage basket according to claim 2 or 3, further comprising a fourth metal sheet (5) with a "Z"-shaped longitudinal section, wherein the bottom of each side plate (11) is provided with an inner flanging (113); the fourth metal sheet (5) is an independently formed member or is integrated with the inner flanging (113); the fourth metal sheet (5) comprises a third notch (51) and a fourth notch (52); when the fourth metal sheet (5) is the independently formed member, the inner flanging (113) is plugged into the third notch (51), and correspondingly, the bottom plate (2) is plugged into the fourth notch (52); or the inner flanging (113) is plugged into the fourth notch (52), and correspondingly, the bottom plate (2) is plugged into the third notch (51); when the fourth metal sheet (5) is integrated with the inner flanging (113), the bottom plate (2) is plugged into the fourth notch (52).
8. The storage basket according to claim 1, wherein the side frame (1), the bottom plate (2) or the corner protector (3) is of a solid sheet metal structure, or a plate net of any mesh stretching structure, a meshed structure, or a stretching sheet metal structure with any mesh in the middle; and patterns may be stamped on the outer wall of the corner protector (3).
9. The storage basket according to claim 2, wherein two ends of the side plate (11) are provided with first fastening hooks (114); two ends of the corner protector (3) are provided with second fastening hooks (34); and the first fastening hooks (114) and the second fastening hooks (34) are clamped.
10. The storage basket according to claim 1 wherein two ends of the bent portion (31) are provided with plug-in holes (1112), and correspondingly, two ends of the outer frame (111) are provided with plug-in portions (311) matched with the plug-in holes (1112); or, two ends of the outer frame (111) are provided with plug-in holes (1112), and correspondingly, the bent portion (31) is provided with plug-in portions (311) matched with the plug-in holes (1112); and two ends of the bottom of the side plate (11) or two ends of the bottom of the corner protector (3) are provided with avoiding gaps (331).