Cross beam connecting structure of goods shelf

Abstract

A cross beam connecting structure of a goods shelf belongs to the technical field of commercial facilities. Which comprises at least one front upright post, at least one rear upright post, at least one front cross beam detachably connected with the front upright post, at least one rear cross beam detachably connected with the rear upright post, and at least one laminate arranged between the front cross beam and the rear cross beam, and is characterized in that the two ends of the rear cross beam are respectively detachably or fixedly connected with a rear cross beam mounting piece; and the rear cross beam mounting pieces are respectively used for being detachably connected with the panels or the side plates of the corresponding rear upright posts. The goods shelf has the advantages that the purpose of adjusting the whole shelf through single-side operation is achieved only by adjusting the rear cross beam on one side of the front stand column, and the problem that in the prior art, when the goods shelf is close to or attached to an obstacle, the rear cross beam and the rear stand column are inconvenient to adjust is solved; the operation and maintenance efficiency of storage is effectively improved, and the error-tolerant rate of installation and maintenance is improved.

Description

Technical Field

[0001] This invention belongs to the field of commercial facility technology, and specifically relates to a beam connection structure for a shelving unit. Background Technology

[0002] As an indispensable storage device in modern warehousing, supermarkets, and industrial production, the rationality of the racking's structural design directly affects space utilization, ease of installation, and flexibility of use. Traditional modular racking is typically assembled from uprights, beams, shelves, and connectors. In a standard racking structure, four uprights are usually provided, with a pair of front uprights and a pair of rear uprights forming the four corners of the racking. The front and rear uprights are spaced apart and symmetrically arranged. In the lateral direction, two front uprights or two rear uprights are connected by beams to form a stable horizontal load-bearing frame. In addition, to ensure the stability of the racking, adjacent front and rear uprights are usually reinforced with diagonal braces, connecting plates, or back mesh.

[0003] In the mainstream design of existing shelving, beams are the main load-bearing components supporting the shelves. To ensure the overall stability and balanced stress of the shelving, it is usually required that the front and rear beams be installed symmetrically at the same height. This means that when adjusting the height of one shelf, the connection positions of the beams on the front and rear uprights need to be operated and adjusted simultaneously. However, this symmetrical installation structure reveals obvious technical defects in practical applications, especially in scenarios where the shelving needs to be placed against a wall or back-to-back. When the rear upright of the shelving is close to the wall or other obstructions, if the shelf height needs to be adjusted, the operator must be able to reach and operate the connection points of the front and rear beams on the uprights simultaneously. However, because the rear upright is close to the obstruction, the connection structure on it is blocked by the obstruction, making it impossible for the operator to install or remove the beams on the rear upright to adjust the height without moving the entire shelving (i.e., separating it from the obstruction). This design limitation makes it extremely inconvenient for shelving units placed against walls or other structures to be maintained and adjusted later, greatly reducing the flexibility and efficiency of warehouse management.

[0004] In view of the aforementioned problems, it is necessary to design a simple, low-cost beam connection structure for a shelving unit that allows for easy adjustment of the beams on the rear uprights from the front. To this end, the applicant has ingeniously designed this technical solution. Summary of the Invention

[0005] The purpose of this invention is to provide a beam connection structure for a shelving unit, which helps to improve the connection structure between the rear uprights and the rear beams, allowing the rear beams to be adjusted from the front of the shelving unit. This enables full-rack adjustment through unilateral operation, which is beneficial for improving warehouse operation and maintenance efficiency and increasing the fault tolerance rate of installation and maintenance.

[0006] The objective of this invention is achieved by providing a beam connection structure for a shelving unit, comprising at least one front upright, at least one rear upright, at least one front beam detachably connected to the front upright, at least one rear beam detachably connected to the rear upright, and at least one shelf disposed between the front beam and the rear beam. The characteristic feature is that each end of the rear beam is detachably or fixedly connected to a rear beam mounting component, and the rear beam mounting components are respectively used to detachably connect to the rear upright side plate or rear upright panel of the corresponding rear upright.

[0007] In a specific embodiment of the present invention, the front column and the corresponding rear column have rectangular or C-shaped cross sections and are symmetrically arranged at front and rear intervals; the front crossbeam and the rear crossbeam are symmetrically arranged at front and rear intervals, the upper edge of the front crossbeam facing the rear crossbeam forms a front crossbeam groove, and the upper edge of the rear crossbeam facing the front crossbeam forms a rear crossbeam groove; the lower edges of the front and rear sides of the shelf rest on the front crossbeam groove and the rear crossbeam groove, respectively.

[0008] In another specific embodiment of the present invention, the front column includes a front column back plate, a pair of front column side plates formed on both sides of the front column back plate, and a front column panel parallel to and connected to the front column side plates; the rear column includes a rear column back plate, a pair of rear column side plates formed on both sides of the rear column back plate, and a rear column panel parallel to and connected to the rear column side plates, wherein the front column back plate is disposed toward the side away from the rear column, and the rear column back plate is disposed toward the side away from the front column.

[0009] In another specific embodiment of the present invention, the front pillar back plate is provided with two rows of front pillar back plate slots spaced apart along the height direction, and a front pillar back plate pin hole is respectively provided between two adjacent front pillar back plate mounting slots. The front pillar side plate is provided with one row of front pillar side plate slots and one row of front pillar side plate holes spaced apart along the height direction. The front pillar side plate holes are close to one side of the front pillar back plate, and a front pillar side plate pin hole is respectively provided between two adjacent front pillar side plate slots. The front pillar panel is provided with a front pillar panel slot at a position corresponding to the front pillar back plate slot along the height direction, and a pin hole is respectively provided between two adjacent front pillar panel slots. The front pillar panel has pin holes; the rear pillar back plate has two rows of rear pillar back plate slots spaced apart along the height direction, and a rear pillar back plate pin hole is opened between two adjacent rear pillar back plate slots; the rear pillar side plate has one row of rear pillar side plate slots and one row of rear pillar side plate holes spaced apart along the height direction, the rear pillar side plate holes are located on the side closer to the rear pillar back plate, and a rear pillar side plate pin hole is opened between two adjacent rear pillar side plate slots; the rear pillar panel has a rear pillar panel slot at a position corresponding to the rear pillar back plate slot along the height direction, and a rear pillar panel pin hole is opened between two adjacent rear pillar panel slots.

[0010] In another specific embodiment of the present invention, the shapes of the front column back plate latch, the front column side plate latch, the front column panel latch, the rear column back plate latch, the rear column side plate latch, and the rear column panel latch are respectively one of the following: butterfly latch, gourd-shaped latch, isosceles hexagonal latch, or inverted isosceles trapezoidal latch.

[0011] In another specific embodiment of the present invention, the card hole shapes of the front column side plate card hole and the rear column side plate card hole are elongated holes.

[0012] In another specific embodiment of the present invention, a front crossbeam mounting component is fixed on each of the left and right sides of the front crossbeam. The front crossbeam mounting component is detachably connected to the front column back plate of the front column. The front crossbeam mounting component has at least one crossbeam mounting component clip spaced along the height direction on the side facing the front column. The front crossbeam mounting component has at least one front crossbeam mounting component pin hole on the side facing the front column.

[0013] In a further specific embodiment of the present invention, the rear crossbeam mounting component and the rear crossbeam are detachably mounted. The lower edge of the rear crossbeam mounting component is bent forward and then bent upward to form a rear crossbeam mounting component support plate. One end of the rear crossbeam rests on the rear crossbeam mounting component support plate. The rear crossbeam mounting component has a rear crossbeam mounting component fixing plate bent on one side facing the corresponding rear column. At least one rear crossbeam mounting component first locking foot I is formed at intervals along the height direction on the rear crossbeam mounting component fixing plate. The rear crossbeam mounting component first locking foot I is engaged and connected with the rear column side plate of the rear column.

[0014] In a further specific embodiment of the present invention, the rear crossbeam mounting member is fixedly installed with the rear crossbeam, the rear crossbeam mounting member is configured as a right-angle structure and is engaged with the rear column panel of the rear column, the rear crossbeam mounting member has at least one rear crossbeam mounting member second locking foot II spaced along the height direction on the front side facing the rear column, and the rear crossbeam mounting member has at least one rear crossbeam mounting member pin hole on the front side facing the rear column.

[0015] The technical advantages of the solution provided by this invention are as follows: Since the rear crossbeam is detachably connected to the rear upright side plate or rear upright panel through the rear crossbeam mounting component, the operator only needs to adjust the rear crossbeam on the front upright side to achieve the purpose of adjusting the entire rack through single-sided operation. This avoids the problem of inconvenient adjustment between the rear crossbeam and the rear upright when the rack is close to or against an obstacle in the existing technology, effectively improving the operation and maintenance efficiency of the warehouse and increasing the fault tolerance rate of installation and maintenance. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present invention; Figure 2 This is a three-dimensional structural schematic diagram of another embodiment of the present invention.

[0017] In the diagram: 1. Front upright, 11. Front upright back plate, 111. Front upright back plate latch, 112. Front upright back plate pin hole, 12. Front upright side plate, 121. Front upright side plate latch, 122. Front upright side plate pin hole, 123. Front upright side plate pin hole, 13. Front upright panel, 131. Front upright panel latch, 132. Front upright panel pin hole; 2. Rear upright, 21. Rear upright back plate, 211. Rear upright back plate latch, 212. Rear upright back plate pin hole, 22. Rear upright side plate, 221. Rear upright side plate latch, 2 22. Rear column side plate clip hole; 223. Rear column side plate pin hole; 23. Rear column panel; 231. Rear column panel clip; 232. Rear column panel pin hole; 3. Front crossbeam; 31. Front crossbeam mounting component; 311. Crossbeam mounting component clip; 312. Front crossbeam mounting component pin hole; 32. Front crossbeam groove; 4. Rear crossbeam; 41. Rear crossbeam mounting component; 411. Rear crossbeam mounting component support plate; 412. Rear crossbeam mounting component fixing plate; 413. Crossbeam mounting component first clip I; 414. Rear crossbeam mounting component pin hole; 415. Crossbeam mounting component second clip II; 42. Rear crossbeam groove; 5. Shelf. Detailed Implementation

[0018] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of the present invention should be considered within the scope of protection of the present invention.

[0019] In the following description, all directional or positional concepts involving up, down, left, right, front, and back are based on... Figure 1 The positions shown are for reference only and should not be construed as a particular limitation on the technical solutions provided by this invention.

[0020] Example 1: Please refer to Figure 1The present invention illustrates a beam connection structure for a shelf, including at least one front upright 1, at least one rear upright 2, at least one front beam 3 detachably connected to the front upright 1, at least one rear beam 4 detachably connected to the rear upright 2, and at least one shelf 5 disposed between the front beam 3 and the rear beam 4. Each end of the aforementioned rear beam 4 is detachably connected to a rear beam mounting member 41, and the aforementioned rear beam mounting member 41 is used to detachably connect with the rear upright side plate of the corresponding rear upright 2. Specifically, the lower edge of the aforementioned rear crossbeam mounting component 41 is bent forward and then upward to form a rear crossbeam mounting component support plate 411. One end of the aforementioned rear crossbeam 4 rests on the rear crossbeam mounting component support plate 411. The aforementioned rear crossbeam mounting component 41 has a rear crossbeam mounting component fixing plate 412 bent on one side facing the corresponding rear column 2. The aforementioned rear crossbeam mounting component fixing plate 412 has at least one rear crossbeam mounting component first locking foot I 413 spaced along the height direction. The aforementioned rear crossbeam mounting component first locking foot I 413 is engaged with the rear column side plate of the rear column 2. In this embodiment, the number of the aforementioned rear crossbeam mounting component first locking foot I 413 is shown to be three.

[0021] Furthermore, the cross-sections of the aforementioned front column 1 and the corresponding rear column 2 are rectangular or C-shaped and are symmetrically arranged at intervals. In this embodiment, the cross-sections of the aforementioned front column 1 and the corresponding rear column 2 are preferably rectangular. The aforementioned front crossbeam 3 and rear crossbeam 4 are arranged horizontally symmetrically at intervals. The upper edge of the aforementioned front crossbeam 3 facing the rear crossbeam 4 forms a front crossbeam groove 32, and the upper edge of the aforementioned rear crossbeam 4 facing the front crossbeam 3 forms a rear crossbeam groove 42. The lower edges of the front and rear sides of the aforementioned shelf 5 rest on the front crossbeam groove 32 and the rear crossbeam groove 42, respectively.

[0022] Furthermore, the aforementioned front pillar 1 includes a front pillar back plate 11, a pair of front pillar side plates 12 formed on both sides of the front pillar back plate 11, and a front pillar panel 13 parallel to the front pillar back plate 11 and connected to the front pillar side plates 12; the aforementioned rear pillar 2 includes a rear pillar back plate 21, a pair of rear pillar side plates 22 formed on both sides of the rear pillar back plate 21, and a rear pillar panel 23 parallel to the rear pillar back plate 21 and connected to the rear pillar side plates 22. The aforementioned front pillar back plate 11 is disposed towards the side away from the rear pillar 2, and the aforementioned rear pillar back plate 21 is disposed towards the side away from the front pillar 1.

[0023] Furthermore, the aforementioned front pillar back plate 11 has two rows of front pillar back plate slots 111 spaced apart along the height direction, and a front pillar back plate pin hole 112 is respectively opened between two adjacent front pillar back plate mounting slots 111. The aforementioned front pillar side plate 12 has a row of front pillar side plate slots 121 and a row of front pillar side plate slots 122 spaced apart along the height direction. The aforementioned front pillar side plate slots 122 are close to one side of the front pillar back plate 11, and a front pillar side plate pin hole 123 is respectively opened between two adjacent front pillar side plate slots 121. The aforementioned front pillar panel 13 has a front pillar panel slot 131 at the position corresponding to the front pillar back plate slots 111 along the height direction, and a front pillar panel pin hole 132 is respectively opened between two adjacent front pillar panel slots 131. The aforementioned rear pillar back plate 21 has a row of slots 131 spaced apart along the height direction. Two rows of rear column backplate slots 211 are provided, and a rear column backplate pin hole 212 is opened between two adjacent rear column backplate slots 211. The rear column side plate 22 is provided with a row of rear column sideplate slots 221 and a row of rear column sideplate slot holes 222 at intervals along the height direction. The rear column sideplate slot holes 222 are located on the side close to the rear column backplate 21. A rear column sideplate pin hole 223 is opened between two adjacent rear column sideplate slots 221. The rear column panel 23 is provided with a rear column panel slot 231 at the position corresponding to the rear column backplate slots 211 along the height direction. A rear column panel pin hole 232 is opened between two adjacent rear column panel slots 231. The first locking foot I 413 of the rear crossbeam mounting component is respectively engaged in the corresponding rear column sideplate slot 222.

[0024] Furthermore, the shapes of the aforementioned front pillar back panel latch 111, front pillar side panel latch 121, front pillar panel latch 131, rear pillar back panel latch 211, rear pillar side panel latch 221, and rear pillar panel latch 231 are not limited in any way and can be one of a butterfly-shaped latch, a gourd-shaped latch, an isosceles hexagonal latch, or an inverted isosceles trapezoidal latch. In this embodiment, the latch shapes of the aforementioned front pillar back panel latch 111, front pillar side panel latch 121, front pillar panel latch 131, rear pillar back panel latch 211, rear pillar side panel latch 221, and rear pillar panel latch 231 are preferably isosceles hexagonal latches.

[0025] Similarly, the shape of the aforementioned front pillar side plate locking hole 122 and rear pillar side plate locking hole 222 is not limited in any way. In this embodiment, elongated holes are preferred.

[0026] Furthermore, a front crossbeam mounting component 31 is fixed to each of the left and right sides of the aforementioned front crossbeam 3. The aforementioned front crossbeam mounting component 31 is detachably connected to the front column 1 from the front column back plate 11. The aforementioned front crossbeam mounting component 31 has at least one crossbeam mounting component latch 311 spaced along the height direction on the side facing the front column 1. The aforementioned front crossbeam mounting component 31 has at least one front crossbeam mounting component pin hole 312 on the side facing the front column 1. In this embodiment, the number of the aforementioned crossbeam mounting component latch 311 is preferably three, and they are respectively connected to the front column back plate latch 111 on the front column 1; the number of the aforementioned front crossbeam mounting component pin hole 312 is preferably one, and it is fixedly connected by a pin after being aligned with a front column back plate pin hole 112.

[0027] Please continue reading. Figure 1 When assembling a shelf and placing the aforementioned rear upright 2 against a wall or another shelf or other obstacle, first connect the aforementioned front upright 1 and the corresponding rear upright 2 in pairs using connecting pieces. Then, place the connected front upright 1 and rear upright 2 vertically with a gap between them. Next, attach the aforementioned front crossbeam 3 to the front upright back plate slots 111 of the front upright 1 on both sides using the front crossbeam mounting piece 31. Then, attach the aforementioned rear crossbeam mounting piece 41 to the corresponding rear upright side plate slots 222 using the first locking foot Ⅰ 413 of the rear crossbeam mounting piece. The aforementioned rear crossbeam 4 rests on the rear crossbeam mounting piece support plate 411. At this time, the height of the aforementioned front crossbeam 3 and rear crossbeam 4 is consistent. Finally, place the aforementioned shelf 5 between the front crossbeam 3 and the rear crossbeam 4. The entire operation only requires the operator to operate on one side of the front upright 1 to complete the installation. The operation is simple and convenient, and the efficiency is greatly improved.

[0028] Example 2: Please refer to Figure 2The structure of this embodiment is basically the same as that of Embodiment 1, except that: a rear crossbeam mounting component 41 is fixedly connected to each end of the aforementioned rear crossbeam 4, and the aforementioned rear crossbeam mounting component 41 is used to detachably connect with the rear column panel of the corresponding rear column 2. Specifically: the aforementioned rear crossbeam mounting component 41 is fixedly installed with the rear crossbeam 4, and in this embodiment, it is installed by welding. The aforementioned rear crossbeam mounting component 41 is configured as a right-angle structure and is engaged with the front side of the rear column 2. The aforementioned rear crossbeam mounting component 41 has at least one rear crossbeam mounting component second locking foot II 415 spaced along the height direction on the front side facing the rear column 2, and the aforementioned rear crossbeam mounting component 41 has at least one rear crossbeam mounting component pin hole 414 opened on the front side facing the rear column 2. In this embodiment, the number of the second locking feet II 415 of the rear crossbeam mounting component is preferably three, and they are respectively locked onto the rear column panel locking slot 231 on the side of the rear column 2 near the rear crossbeam mounting component 41. The number of the aforementioned rear crossbeam mounting component pin holes 414 is preferably one, and they are aligned with the rear column panel pin holes 232 and then connected and fixed by a pin.

[0029] Please continue reading. Figure 2 During the assembly process, the aforementioned rear crossbeam mounting component 41 is secured to the corresponding rear column panel slot 231 via the second clip II 415 of the rear crossbeam mounting component. At this time, the heights of the aforementioned front crossbeam 3 and rear crossbeam 4 are consistent. Finally, the aforementioned shelf 5 is placed between the front crossbeam 3 and the rear crossbeam 4. The entire operation process can be completed by the staff located on one side of the front column 1, thereby effectively improving the operation and maintenance efficiency of the warehouse and the fault tolerance rate of installation and maintenance.

Claims

1. A beam connection structure for a shelving unit, comprising at least one front upright (1), at least one rear upright (2), at least one front beam (3) detachably connected to the front upright (1), at least one rear beam (4) detachably connected to the rear upright (2), and at least one shelf (5) disposed between the front beam (3) and the rear beam (4), characterized in that: The two ends of the rear crossbeam (4) are respectively detachably or fixedly connected to a rear crossbeam mounting component (41), and the rear crossbeam mounting component (41) is used to detachably connect with the rear column side plate or rear column panel of the corresponding rear column (2).

2. The beam connection structure of the shelf according to claim 1, characterized in that: The front column (1) and the corresponding rear column (2) have rectangular or C-shaped cross sections and are symmetrically arranged at front and rear intervals; the front crossbeam (3) and the rear crossbeam (4) are symmetrically arranged at front and rear intervals, the upper edge of the front crossbeam (3) facing the rear crossbeam (4) forms a front crossbeam groove (32), and the upper edge of the rear crossbeam (4) facing the front crossbeam (3) forms a rear crossbeam groove (42); the lower edges of the front and rear sides of the shelf (5) rest on the front crossbeam groove (32) and the rear crossbeam groove (42) respectively.

3. The beam connection structure of the shelf according to claim 1, characterized in that: The front pillar (1) includes a front pillar back plate (11), a pair of front pillar side plates (12) formed on both sides of the front pillar back plate (11), and a front pillar panel (13) parallel to the front pillar back plate (11) and connected to the front pillar side plates (12); the rear pillar (2) includes a rear pillar back plate (21), a pair of rear pillar side plates (22) formed on both sides of the rear pillar back plate (21), and a rear pillar panel (23) parallel to the rear pillar back plate (21) and connected to the rear pillar side plates (22). The front pillar back plate (11) is disposed toward the side away from the rear pillar (2), and the rear pillar back plate (21) is disposed toward the side away from the front pillar (1).

4. The beam connection structure of the shelf according to claim 3, characterized in that: The front pillar back plate (11) has two rows of front pillar back plate slots (111) spaced apart along the height direction. A front pillar back plate pin hole (112) is respectively opened between two adjacent front pillar back plate mounting slots (111). The front pillar side plate (12) has one row of front pillar side plate slots (121) spaced apart vertically and one row of front pillar side plate holes (122) spaced apart vertically along the height direction. 122) On one side close to the front pillar back plate (11), a front pillar side plate pin hole (123) is opened between the two adjacent front pillar side plate slots (121) respectively. The front pillar panel (13) is opened with a front pillar panel slot (131) at the position corresponding to the front pillar back plate slot (111) along the height direction. A front pillar panel pin hole (132) is opened between the two adjacent front pillar panel slots (131) respectively. The rear column back plate (21) has two rows of rear column back plate slots (211) spaced apart along the height direction. A rear column back plate pin hole (212) is respectively opened between two adjacent rear column back plate slots (211). The rear column side plate (22) has one row of rear column side plate slots (221) spaced apart vertically and one row of rear column side plate pin holes (222) spaced apart vertically along the height direction. 22) On the side near the rear column back plate (21), a rear column side plate pin hole (223) is opened between the two adjacent rear column side plate slots (221) respectively. The rear column panel (23) is opened with a rear column panel slot (231) at the position corresponding to the rear column back plate slot (211) along the height direction. A rear column panel pin hole (232) is opened between the two adjacent rear column panel slots (231) respectively.

5. The beam connection structure of the shelf according to claim 4, characterized in that: The shapes of the front column back panel latch (111), front column side panel latch (121), front column panel latch (131), rear column back panel latch (211), rear column side panel latch (221), and rear column panel latch (231) are respectively one of the following: butterfly latch, gourd-shaped latch, isosceles hexagonal latch, or inverted isosceles trapezoidal latch.

6. The beam connection structure of the shelf according to claim 4, characterized in that: The card hole shapes of the front column side plate card hole (122) and the rear column side plate card hole (222) are elongated holes.

7. The beam connection structure of the shelf according to claim 4, characterized in that: A front crossbeam mounting component (31) is fixed on each of the left and right sides of the front crossbeam (3). The front crossbeam mounting component (31) is detachably connected to the front column (1) from the front column back plate (11). The front crossbeam mounting component (31) has crossbeam mounting component feet (311) spaced along the height direction on the side facing the front column (1). The front crossbeam mounting component (31) has at least one front crossbeam mounting component pin hole (312) on the side facing the front column (1).

8. The beam connection structure of the shelf according to claim 3, characterized in that: The rear crossbeam mounting component (41) and the rear crossbeam (4) are detachably installed. The lower edge of the rear crossbeam mounting component (41) is bent forward and then bent upward to form a rear crossbeam mounting component support plate (411). One end of the rear crossbeam (4) rests on the rear crossbeam mounting component support plate (411). The rear crossbeam mounting component (41) has a rear crossbeam mounting component fixing plate (412) bent on one side facing the corresponding rear column (2). The rear crossbeam mounting component fixing plate (412) has at least one rear crossbeam mounting component first locking foot I (413) spaced along the height direction. The rear crossbeam mounting component first locking foot I (413) is engaged with the rear column side plate (22) of the rear column (2).

9. The beam connection structure of the shelf according to claim 3, characterized in that: The rear crossbeam mounting component (41) is fixedly installed with the rear crossbeam (4). The rear crossbeam mounting component (41) is configured as a right-angle structure and is engaged with the rear column panel (23) of the rear column (2). The rear crossbeam mounting component (41) has at least one rear crossbeam mounting component second locking foot II (415) spaced along the height direction on the front side facing the rear column (2). The rear crossbeam mounting component (41) has at least one rear crossbeam mounting component pin hole (414) on the front side facing the rear column (2).

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