Transfer workbench

Abstract

The utility model relates to the field of transfer equipment, and discloses a transfer workbench which comprises a transfer platform and a transfer unit arranged on the transfer platform, and the transfer unit is detachably arranged on the transfer platform and can rotate horizontally. Through cooperative use of the transfer platform and the transfer unit, products can be placed on the transfer unit, the products can be transferred by rotating the transfer unit and moving the transfer platform after the transfer unit is disassembled, and the whole product moving process and the whole product carrying process are both achieved by moving the transfer platform. And the products can be conveniently transferred to any direction, the use of logistics vehicles is reduced, the products can be protected in the moving process through the transfer platform and the transfer units, and the probability of product damage is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of transfer devices, and in particular to a transfer workbench. Background Technology

[0002] In the production of heavy industrial materials, due to the inherent quality characteristics of the products, logistics transfer vehicles are commonly used as the transport carriers for process components (hereinafter referred to as "products"). Taking the integrated power battery system for new energy vehicles (hereinafter referred to as "new energy pack") as an example, this component, as the core power unit of the vehicle, is a functional module composed of battery modules, thermal management systems, and structural frames. Its typical dimensions can be as large as 2000*1500*200mm (length*width*height), and its overall weight generally exceeds 500kg. During the production process, dedicated logistics vehicles must be used to complete cross-process transfers.

[0003] In the current operational process, the loading and unloading of new energy packs mainly relies on manual operation or mechanical assistance. Operators need to use hydraulic forklifts or lifting equipment to transfer the new energy packs to the logistics vehicle's carrying platform for transport. This traditional operation method has limitations and potential quality risks: First, the outer shell of the new energy pack uses aluminum alloy or polymer composite material surface treatment layers, which are prone to scratches, dents, and other cosmetic damage during frequent contact and transfer; second, the rigid contact between the logistics vehicle's metal frame and the new energy pack body may lead to structural micro-cracks under transportation vibration conditions; third, long-term heavy-load impact can easily cause deformation of the logistics vehicle's load-bearing beams and misalignment of the roller system, resulting in equipment wear and tear problems. This leads to a certain rework rate and a certain frequency of logistics vehicle repairs on the new energy pack production line; and fourth, the current production technology requirements result in high customization costs, high idle rates, and low recyclability, making it difficult to control production costs, especially given the rapidly changing customer requirements. Utility Model Content

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a transfer workbench to solve at least one of the problems in the background art, such as the easy damage to new energy packs and logistics vehicles caused by the use of logistics vehicles.

[0005] To solve the above-mentioned technical problems, the present invention provides a transfer workbench including a transfer platform and a transfer unit disposed on the transfer platform, wherein the transfer unit is detachably disposed on the transfer platform and is capable of horizontal rotation.

[0006] Furthermore, the transfer platform is provided with a support structure for supporting the transfer unit and enabling the transfer unit to rotate horizontally.

[0007] Furthermore, the support structure includes a fixed bearing portion disposed on the transfer platform and a plurality of first rolling bearing portions. The top of the first rolling bearing portion has a first sphere that rolls to support the transfer unit, and the top of the first sphere is flush with the top surface of the fixed bearing portion.

[0008] Furthermore, the fixed support portion is configured as a ring structure.

[0009] Furthermore, the plurality of first rolling bearing portions are provided in the area where the fixed bearing portion transitions and / or in the area around the fixed bearing portion.

[0010] Furthermore, the transfer unit includes a turntable placed on the top surface of the transfer platform, the turntable being adapted to the transfer platform and having obstructions extending upwards on one of its opposite sides.

[0011] Furthermore, the transfer unit also includes at least two sets of transfer sections spaced apart from each other and parallel to the blocking portion, which are disposed on the top surface of the turntable. The transfer sections have upwardly protruding rolling support portions for rolling support of materials.

[0012] Furthermore, the transfer unit also includes a second rolling support part disposed on the top surface of the turntable and distributed at both ends of each transfer part. The second rolling support part has a second ball that rolls to support the material, and the top of the second ball is higher than the top of the rolling support part.

[0013] Furthermore, the transfer platform is supported on a flexible support frame, which includes a main frame with a horizontal top surface and a reinforcement part connected to the inside of the main frame for reinforcing the main frame.

[0014] Furthermore, the main frame includes multiple upper horizontal bars, multiple lower horizontal bars, and multiple vertical bars corresponding to and connected to each upper and lower horizontal bar. The inner side of each upper horizontal bar, lower horizontal bar, and vertical bar has an open space. The reinforcement part includes multiple first support bars connected between each upper horizontal bar and arranged at an incline relative to each upper horizontal bar. The reinforcement part also includes multiple sets of second support bars connected between each upper horizontal bar and vertical bar and arranged at an incline relative to each upper horizontal bar and vertical bar. Each set of second support bars includes two vertical diagonal bars connected between the upper horizontal bar and vertical bar and distributed at an incline, a secondary horizontal bar parallel to the upper horizontal bar and connected to the two vertical diagonal bars, and a secondary vertical bar parallel to the vertical bar and connected to the upper horizontal bar and secondary horizontal bar.

[0015] The transfer workbench of this utility model has at least the following beneficial effects: Through the cooperative use of the transfer platform and the transfer unit, products can be placed on the transfer unit. The transfer of products can be achieved by rotating and disassembling the transfer unit and then moving the transfer platform. The entire product movement and handling process is realized through the mobile transfer platform, which also allows for easy repositioning of products in any direction, reducing the use of logistics vehicles. Furthermore, the transfer platform and transfer unit can protect the products during movement, greatly reducing the probability of product damage. In addition, the use of a support frame makes the entire transfer workbench easy to adjust and highly flexible. The overall structure is simple, assembly is flexible, facilitating the assembly and design of production lines, and the cost is low. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of the transfer workbench of this utility model;

[0018] Figure 2 for Figure 1 An enlarged view of part A shown;

[0019] Figure 3 This is a front sectional view of the transfer workbench of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the bracket of this utility model.

[0021] The meanings of the labels in the attached diagram are as follows:

[0022] Transfer platform 1, transfer unit 2, turntable 21, transmission part 22, base 221, rolling support part 222, second rolling bearing part 23, second base 231, second sphere 232, blocking part 24, bracket 3, main frame 31, upper horizontal bar 311, first rod 3111, second rod 3112, lower horizontal bar 312, third rod 3121, fourth rod 3122, vertical bar 313, middle horizontal bar 314, reinforcement part 32, first support rod 321, second support rod 322, vertical diagonal bar 3221, secondary horizontal bar 3222, secondary vertical bar 3223, support structure 4, rotating shaft 41, fixed bearing part 42, turning area 421, outer peripheral area 422, first rolling bearing part 43, first base 431, first sphere 432. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] Please see Figures 1 to 4 The transfer workbench of this utility model includes a transfer platform 1, a transfer unit 2 disposed on the transfer platform 1, and a support 3 disposed at the bottom of the transfer platform 1. The transfer platform 1 is used to support the transfer unit 2 so that the transfer unit 2 can rotate relative to the transfer platform 1. The support 3 is used to support the transfer platform 1 so as to elevate and support the transfer when needed.

[0025] In this embodiment, the transfer platform 1 is a plate-like structure, which can be rectangular, square, circular, or other geometric structures. The transfer platform 1 is made of a reusable material with low density, such as metal, plastic, or wood. Alternatively, it can be a composite material with plastic or wood as the main body and a metal coating. This design facilitates the processing and installation of other structural components, reduces overall weight, and meets the requirement of a longer service life. The top and bottom surfaces of the transfer platform 1 are both horizontal. A support structure 4 is provided on the top surface of the transfer platform 1. The transfer unit 2 is detachably connected to the transfer platform 1 and can rotate horizontally relative to the platform. The support structure 4 supports the transfer unit 2 to improve the stability of the platform's support. Simultaneously, the support structure 4 also assists in the horizontal rotation of the transfer unit 2, ensuring sufficient support for the product while facilitating reversal when the platform 1 is stationary. A rotating shaft 41 is vertically protruding upward at the center of the transfer platform 1. A bearing can be fixedly mounted on the rotating shaft 41, which is fixedly connected to the inner ring of the bearing. An annular connecting ring is fixedly fitted on the outer ring side of the bearing, forming a spline groove on the outer circumference of the connecting ring. A keyway is provided on the transfer unit 2 for the connecting ring to be riveted to the spline groove in the vertical direction, so that the transfer unit 2 can be installed or removed from the connecting ring in the vertical direction, thereby realizing a detachable connection and rotational engagement with the transfer platform 1.

[0026] In this embodiment, the support structure 4 includes a fixed bearing portion 42 and multiple first rolling bearing portions 43 disposed on the transfer platform 1. The fixed bearing portion 42 provides static and fixed support for the transfer unit 2 to ensure basic stability. Each first rolling bearing portion 43 provides rolling support for the transfer unit 2 to further enhance the support strength of the transfer unit 2 while assisting the transfer unit 2 in rotation. The fixed bearing portion 42 is configured as a ring structure, preferably annular, so that the fixed bearing portion 42 has a transition area 421 within the inner ring and an outer peripheral area 422 outside its outer ring. The fixed bearing portion 42 is coaxial and concentrically arranged with the rotating shaft 41. The bottom surface of the fixed bearing portion 42 is in contact with the top surface of the transfer platform 1, and the top surface of the fixed bearing portion 42 has a horizontal support surface for supporting it. The rotating shaft 41 is located within the transition area 421 of the fixed bearing portion 42. In one embodiment, the first rolling bearing portions 43 are arranged in a ring array within the transition area 421 with the rotating shaft 41 as the center. In another embodiment, the first rolling support portion 43 is arranged in a ring array around the fixed support portion 42 in its outer peripheral region 422. In another embodiment, the first rolling support portion 43 is divided into two parts: one part is arranged in a ring array around the fixed support portion 42 in its outer peripheral region 422, and the other part is arranged in a ring array around the fixed support portion 42 in its outer peripheral region 422. That is, the first rolling support portion 43 is provided on the top surface of the transfer platform 1, in both the transition area 421 and the outer peripheral region 422 of the fixed support portion 42. The first rolling support portion 43 includes a first base 431 fixedly connected to the top surface of the transfer platform 1 and a first sphere 432 located on top of the first base 431. A first cavity is provided inside the first base 431, which is adapted to the first sphere 432 and has a diameter slightly larger than that of the first sphere 432. The top of the first cavity is open and is two-thirds spherical. The diameter of the top opening of the first cavity is smaller than that of the first sphere 432. The middle and lower parts of the first sphere 432 are located inside the first cavity so that the first sphere 432 can roll freely relative to the first cavity. The top of the first sphere 432 extends upward out of the first cavity and is flush with the horizontal support surface of the top surface of the fixed bearing part 42 so that the top of the first sphere 432 can be used to roll and support the transfer unit 2.

[0027] In this embodiment, the transfer unit 2 includes a turntable 21 placed on the top surface of the transfer platform 1, at least two sets of spaced-apart transmission sections 22 disposed on the top surface of the turntable 21 and parallel to the blocking section 24, and second rolling bearing sections 23 disposed on the top surface of the turntable 21 and located at both ends of each transmission section 22. The turntable 21 is used to carry the product, and the transmission sections 22 facilitate the movement of the product in and out of the turntable 21. That is, the product can be moved onto the turntable 21 through the transmission section 22, or it can be moved out of the turntable 21 through the transmission section 22. The second rolling bearing section 23 is used to support the turntable 21 and facilitates the rotation of the product when the product orientation needs to be adjusted. It should be noted that the transfer unit 2 is not limited to this embodiment. In another embodiment, the transfer unit 2 includes an electric slide table disposed on the transfer platform 1 and a turntable 21 connected to the electric slide table. The turntable 21 is rotatably connected to the transfer platform 1 via a turntable rotatably disposed on the transfer platform 1, so that the turntable 21 can rotate and move horizontally.

[0028] In this embodiment, the turntable 21 is adapted to the transfer platform 1 and can be any shape, such as rectangular, square, or circular. In this embodiment, the turntable 21 is still made of reusable materials with low mass density, such as plastic or wood. Alternatively, it can be made primarily of plastic or wood with a layer of metal composite material covering its surface to reduce the overall mass of the turntable 21, facilitating the movement of the entire device while still providing support for the product. This allows for design changes and modifications, and is less costly than using metal materials entirely. A keyway is provided at the center of the bottom surface of the turntable 21 to allow it to be mounted or detached from the rotating shaft 41. After mounting the turntable 21 on the rotating shaft 41, it can rotate to meet the requirements of IE engineering operations and technical specifications, corresponding to the requirement of rotating products at each workstation. To prevent products from falling during transport, blocking portions 24 extend upwards from one of the opposite sides of the turntable 21, forming L-shaped guardrails on each side of the turntable 21. The two blocking parts 24 can be respectively set on the two relatively long sides. Since the volume and size of the blocking parts 24 are relatively small, the material of the blocking parts 24 can be the same as that of the turntable 21, or it can be any other material different from that of the turntable 21.

[0029] In this embodiment, the transmission section 22 is configured as two sets and arranged parallel to the distribution direction of the blocking section 24, and the two transmission sections 22 are symmetrically arranged with respect to the two blocking sections 24 of the turntable 21. Each transmission section 22 is a smooth strip, and the specific structure of the transmission section 22 may include a base 221 fixedly installed on the top surface of the turntable 21 and a rolling support section 222 rolled on the top of the base 221. Multiple rolling support sections 222 are arranged sequentially along the length direction of the base 221, and each rolling support section 222 is independent of each other and can rotate on its own. The base 221 is made of metal material, and the base 221 is long and parallel to the blocking section 24. A mounting groove is recessed downward on the top surface of the base 221, and the two ends of the mounting groove extend along the length direction of the base 221 to the two ends of the base 221. The rolling support sections 222 are arranged at the two ends of the mounting groove. On both sides of the mounting groove, opposite to the positions of the rolling support 222, there are recessed slots facing away from each other. The slots can be cylindrical. The rolling support 222 is cylindrical and made of a rigid material, such as plastic or metal. Both ends of the rolling support 222 have protruding posts facing away from each other, which pass through the corresponding slots to allow for rolling relative to them. Alternatively, bearings can be mounted on the protruding posts, and grooves can be formed in the base 221 to hold the bearings within the grooves, thus achieving the rolling support 222. The top of the rolling support 222 protrudes upwards from the top surface of the base 221, allowing the product to contact the rolling support 222 for a rolling fit. In use, the bottom of the product is supported on the rolling support 222. When the product is pushed along the length of the rolling support 222, the rolling of the rolling support 222 reduces friction on the product, facilitating its movement.

[0030] In this embodiment, the second rolling support part 23 includes a second base 231 fixedly connected to the top surface of the turntable 21 and a second sphere 232 located on top of the second base 231. A second cavity, adapted to the second sphere 232 and with a diameter slightly larger than that of the second sphere 232, is provided within the second base 231. The top of the second cavity is open and two-thirds spherical, and the diameter of the top opening of the second cavity is smaller than the diameter of the second sphere 232. The lower middle part of the second sphere 232 is located within the second cavity, allowing the second sphere 232 to roll freely relative to the second cavity. The top of the second sphere 232 extends upwards out of the second cavity and is flush with the horizontal support surface of the top surface of the fixed support part 42, so that the top of the second sphere 232 can be used to roll and support the product.

[0031] In this embodiment, the support 3 includes a main frame 31 with a horizontal top surface and a reinforcing part 32 connected to the inside of the main frame 31 for reinforcing the main frame 31. The transfer platform is fixedly connected to the top surface of the main frame 31. The main frame 31 is used to support the transfer platform, and the reinforcing part 32 reinforces the transfer platform.

[0032] In this embodiment, the main frame 31 includes multiple upper horizontal bars 311, multiple lower horizontal bars 312, and multiple vertical bars 313 corresponding to each upper horizontal bar 311 and lower horizontal bar 312. Each upper horizontal bar 311, lower horizontal bar 312, and vertical bar 313 has an open space on its inner side. Specifically, the upper horizontal bars 311 include four parallel and spaced-apart first bars 3111 and three second bars 3112 perpendicular to the first bars 3111. The second bars 3112 are parallel and spaced-apart, and each first bar 3111 is connected to a second bar 3112 at both ends and midpoint to form a grid. It should be noted that the number of second rods 3112 of the first rod 3111 is not limited to the number in this embodiment, as long as there are at least two first rods 3111 and two rods 3112. The more first rods 3111 and two rods 3112 there are, the stronger the structure. The lower crossbar 312 includes at least two third rods 3121 and at least two fourth rods 3122. The arrangement of the lower crossbar 312 is similar to that of the upper crossbar 311, and can be the same or different. For example, four third rods 3121 can be arranged parallel to each of the first rods 3111, and two fourth rods 3122 can be arranged parallel to the second rods 3112. The two ends of each third rod 3121 are connected to two fourth rods 3122 to form a grid. In this embodiment, at least four vertical rods 313 are provided, with the four rods arranged vertically and their ends connected to the four corners of the upper horizontal rod 311 and the lower horizontal rod 312, respectively. That is, the two ends of each of the four vertical rods 313 are connected to the corners of the upper horizontal rod 311 and the lower horizontal rod 312 to form a basic support. Eight vertical rods 313 are provided, with the other four vertical rods 313 corresponding to the first rod body 3111 and the third rod body 3121. The top end of each vertical rod 313 is connected to the connection between the first rod body 3111 and the second rod body 3112, and the bottom end of each vertical rod 313 is connected to the connection between the third rod body 3121 and the fourth rod body 3122 to ensure the stability of the entire main frame 31. To further increase the rigidity of the main frame 31, a middle-level horizontal bar 314 is connected to each vertical bar 313. A total of four middle-level horizontal bars 314 are set and are set to correspond to the second bar 3112 and the two outermost first bars 3111.

[0033] In this embodiment, the reinforcing part 32 includes multiple first support rods 321 connected between each upper horizontal bar 311 and arranged at an incline relative to each upper horizontal bar 311, and multiple sets of second support rods 322 connected between each upper horizontal bar 311 and vertical bar 313 and arranged at an incline relative to each upper horizontal bar 311 and vertical bar 313. The first support plate is used to reinforce the strength of the upper horizontal bar 311, and the second support rods 322 are used to enhance the strength between the upper horizontal bar 311 and vertical bar 313.

[0034] In this embodiment, since there are four first rods 3111 and three second rods 3112, six upper cavities are formed between the upper crossbars 311 by the first rods 3111 and the second rods 3112. Six first support rods 321 are set up corresponding to the upper cavities and are distributed in each upper cavity. Both ends of each first support rod 321 are fixedly connected to the first rods 3111 and the second rods 3112, so that the first support rods 321 are inclined relative to the first rods 3111 and the second rods 3112 to form a triangular support, thereby improving the rigidity of stability.

[0035] In this embodiment, the second support rods 322 are configured in two sets. The two sets of second support rods 322 are arranged between the two first rods 3111 located in the middle and the corresponding vertical rods 313, so as to concentrate on reinforcing the strength of the middle part of the bracket 3, thereby providing concentrated support when the product moves to the middle of the turntable 21. The second support rods 322 can also be correspondingly arranged on the two outermost first rods 3111. Each set of second support rods 322 includes two vertical diagonal rods 3221 connected between the upper horizontal rods 311 and the vertical rods 313 and distributed obliquely, a secondary horizontal rod 3222 parallel to the upper horizontal rods 311 and connected to the two vertical diagonal rods 3221, and a secondary vertical rod 3223 parallel to the vertical rods 313 and connected to the upper horizontal rods 311 and the secondary horizontal rods 3222. Each vertical diagonal brace 3221 has its two ends connected to the middle of the first rod body 3111 and the vertical rod 313, forming a triangular support between the two rods to enhance stability. The two vertical diagonal braces 3221 in each group are connected by a secondary horizontal brace 3222 parallel to the first rod body 3111 to further strengthen the structure. Each group of second support rods 322 has at least two secondary vertical braces 3223, each of which connects the first rod body 3111 and the secondary horizontal brace 3222, thus progressively reinforcing the structure. Each intermediate horizontal brace 314 can also have a secondary vertical brace 3223 between it and the first rod body 3111. In this embodiment, both the main frame 31 and the reinforcing part 32 are made of flexible materials such as lean pipes to reduce weight and cost. The structural strength is ensured by the cooperation between the reinforcing part 32 and the main frame 31. Lean pipes have a certain degree of flexibility, thus having moderate bending and deformation capabilities to adapt to the load requirements of different scenarios. Foot cups can be installed on each vertical bar 313. Foot cups are also installed at the positions where the upper horizontal bar 311, middle horizontal bar 314, and lower horizontal bar 312 connect to the vertical bar 313 to facilitate adjustment of the height of the main support 3. Foot cups are existing technology and will not be described in detail here.

[0036] The working method of one embodiment of the transfer workbench of this utility model is as follows: After the entire transfer workbench is moved to the corresponding workstation as needed, the product is placed on the turntable 21 and transferred to the turntable 21 via the transmission part 22. When the product needs to be rotated, pressure is applied to the turntable 21 by the first rolling bearing part 43, which can drive the turntable 21 to rotate, thereby turning the product. Thus, the product direction can be changed by moving the transfer workbench. When the product needs to be moved to other distant workstations, the turntable 21 can be removed and moved together with the product. The turntable 21 can protect the product. At this time, the support 3 can be moved separately to achieve flexible operation, or the support 3 can be moved together. The support 3 and the turntable 21 together protect the product.

[0037] Compared with the prior art, the transfer workbench of this utility model uses the transfer platform 1, turntable 3 and transfer unit 2 in combination to facilitate the transfer of products and achieve rapid switching through the rotation of turntable 3, thereby reducing the failure rate; the use of bracket 3 makes the entire transfer workbench easy to adjust and highly flexible; the overall structure is simple, the assembly is flexible, and it is convenient for the assembly and design of the production line, with low cost; when the production line changes, bracket 3 can be reused to improve utilization rate, reduce operating costs and reduce idle rate.

Claims

1. A transfer station, characterized by: The transport platform is supported on a flexible support, and the support comprises a horizontal main frame body and a reinforcing part connected to the inner side of the main frame body for reinforcing the main frame body.

2. The transfer station of claim 1, wherein: The transport platform is provided with a support structure for supporting the transport unit and enabling the transport unit to rotate horizontally.

3. The transfer station of claim 2, wherein: The support structure comprises a fixed bearing part provided on the transport platform and a plurality of first rolling bearing parts, the top end of the first rolling bearing part being provided with a first ball for rolling supporting the transport unit, and the top of the first ball being flush with the top surface of the fixed bearing part.

4. The transfer station of claim 3, wherein: The fixed bearing part is configured as a ring structure.

5. The transfer station of claim 4, wherein: The plurality of first rolling bearing parts are arranged in the area combined in the fixed bearing part and / or the area at the periphery of the fixed bearing part.

6. The transfer station of claim 1, wherein: The transport unit comprises a turntable placed on the top surface of the transport platform, the turntable being adaptively arranged with the transport platform and one of the opposite two side edges being upwardly extended to form a blocking part.

7. The transfer station of claim 6, wherein: The transport unit further comprises at least two groups of transmission parts arranged on the top surface of the turntable and spaced apart and parallel to the blocking part, the transmission part being provided with an upwardly protruding rolling support part for rolling supporting the material.

8. The transfer station of claim 7, wherein: The transport unit further comprises a second rolling bearing part arranged on the top surface of the turntable and arranged at the two ends of each transmission part, the second rolling bearing part being provided with a second ball for rolling supporting the material, and the top of the second ball being higher than the top of the rolling support part.

9. The transfer station of claim 1 wherein: The main frame body comprises a plurality of upper horizontal rods, a plurality of lower horizontal rods, and a plurality of vertical rods corresponding to the connection of each upper horizontal rod and lower horizontal rod, and the inner side of each upper horizontal rod, lower horizontal rod and vertical rod has an overhead space. The reinforcing part comprises a plurality of first support rods connected between each upper horizontal rod and inclined relative to each upper horizontal rod. The reinforcing part further comprises a plurality of second support rods connected between each upper horizontal rod and vertical rod and inclined relative to each upper horizontal rod and vertical rod. Each group of second support rods comprises two vertical inclined rods connected between the upper horizontal rod and the vertical rod and symmetrically distributed, a secondary horizontal rod parallel to the upper horizontal rod and connected to the two vertical inclined rods, and a secondary vertical rod parallel to the vertical rod and connected to the upper horizontal rod and the secondary horizontal rod.

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