Support mechanism and compression sofa
Patent Information
- Application Number
- CN202522559046.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-02
- Publication Date
- 2026-09-22
- Estimated Expiration
- 2035-12-02
AI Technical Summary
[0004]本实用新型实施例提供了一种支撑机构及压缩沙发,旨在解决沙发扶手和靠背不稳定易出现倾斜下榻现象及美观性低的问题
[0018]本申请通过设置所述支撑机构,将所述支撑架可拆卸安装在所述底座相邻的两侧上,装配时,将所述支撑架组装到所述底座上,所述底座一侧的所述支撑架用于稳定支撑靠背,所述底座另一侧的所述支撑架用于稳定支撑扶手,以使靠背和扶手内部具有固定支撑件,以能够被稳定支撑,避免靠背和扶手出现倾斜下榻现象;同时通过所述支撑机构以提高沙发立体感,从而提高沙发美观性。并且,在运输过程中,所述支撑架为拆卸状态,并且与所述底座叠放后再同压缩后的靠背、坐垫、扶手装箱,提高装箱率,以降低运输成本。
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Figure CN224776397U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of home furnishing technology, and in particular to a support mechanism and a compression sofa. Background Technology
[0002] With living spaces becoming increasingly compact, compact sofas are gradually becoming the preferred furniture for small apartments and temporary living scenarios due to their advantages of small footprint and ease of movement. While consumers are pursuing their adaptability to different spaces, their demands for stability and user experience are also constantly increasing.
[0003] However, existing compact sofas on the market generally suffer from core technological shortcomings: their armrests and backrests have poor structural design and lack a stable support mechanism, making them prone to tilting and sagging during daily use. This not only affects seating comfort but also poses safety hazards. Furthermore, most of these compact sofas lack dedicated support legs, relying solely on the main structure's contact with the ground for support. This results in a lack of the neatness and three-dimensionality of fixed sofas, failing to achieve their aesthetic appeal. The absence of support legs further exacerbates the instability problem, making compact sofas significantly inferior to fixed sofas in terms of user experience. This makes it difficult to meet consumers' dual demands for practicality and aesthetics in furniture, becoming a key pain point hindering the market promotion of compact sofas. Utility Model Content
[0004] This utility model provides a support mechanism and a compression sofa, aiming to solve the problems of unstable sofa armrests and backrests that are prone to tilting and sagging, as well as poor aesthetics.
[0005] This utility model provides a support mechanism, which includes: At least two support frames; The base has support frames on both adjacent sides, and the base and the support frames are detachably connected. During installation, the support frame is vertically installed on the upper end of the base, the support frame on one side of the base is embedded in the backrest, and the support frame on the other side of the base is embedded in the armrest.
[0006] In the support mechanism provided by this utility model, the support frame is a bent tubular structure, and the two ends of the support frame are spaced apart and detachably connected to the upper end of the base.
[0007] In the support mechanism provided by this utility model, the support frame includes a first vertical section, a second vertical section and a horizontal section. The two ends of the horizontal section are respectively fixedly connected to the first vertical section and the second vertical section. The bottom ends of the first vertical section and the second vertical section are detachably connected to the base.
[0008] In the support mechanism provided by this utility model, the base includes a base plate and a support foot, the support foot is detachably connected to the bottom end of the base plate and is located at the corner of the base plate.
[0009] In the support mechanism provided by this utility model, the base plate is provided with a through hole, and the support foot is also provided directly below the support frame. The support foot is provided with a connecting part, and the connecting part passes through the through hole and is detachably connected to the support frame.
[0010] In the support mechanism provided by this utility model, the bottom end of the support frame is fixedly provided with a threaded ear plate, the connecting part is a screw, and the screw passes through the through hole and is locked and fixed with the threaded ear plate.
[0011] In the support mechanism provided by this utility model, the bottom end of the support frame is welded and fixed to the threaded ear plate.
[0012] In the support mechanism provided by this utility model, the corner of the support frame is an arc-shaped structure.
[0013] In the support mechanism provided by this utility model, there are two support frames, which are respectively located at the two ends of the diagonal of the base.
[0014] In the support mechanism provided by this utility model, a plurality of support frames are fixedly provided on one side of the base, and the plurality of support frames are spaced apart along one side of the base.
[0015] In the support mechanism provided by this utility model, the support frame is integrally formed.
[0016] This utility model also provides a compression sofa, which includes: cushion; A backrest and armrests, the backrest and armrests being located at the top of the seat cushion; A support mechanism, wherein the support mechanism is any of the support mechanisms described above, the base is located at the bottom end of the seat cushion, the support frame on one side of the base is embedded in the seat cushion and the backrest, and the support frame on the other side of the base is embedded in the seat cushion and the armrest.
[0017] In the compression sofa provided by this utility model, the seat cushion is provided with a first mounting groove that runs through its upper and lower ends, the backrest is provided with a second mounting groove that opens upward from its bottom end, the armrest is provided with a third mounting groove that opens upward from its bottom end, one end of the support plate on one side of the base passes through the first mounting groove and is embedded in the second mounting groove, and one end of the support plate on the other side of the base passes through the first mounting groove and is embedded in the third mounting groove.
[0018] This application, by setting up the aforementioned support mechanism, allows the support frame to be detachably installed on both adjacent sides of the base. During assembly, the support frame is assembled onto the base. The support frame on one side of the base provides stable support for the backrest, while the support frame on the other side provides stable support for the armrests. This ensures that the backrest and armrests have internal fixed supports, allowing them to be stably supported and preventing tilting or sagging. Simultaneously, the support mechanism enhances the three-dimensionality of the sofa, thereby improving its aesthetics. Furthermore, during transportation, the support frame is detached and stacked with the base before being packed together with the compressed backrest, seat cushions, and armrests, increasing the packing rate and reducing transportation costs. Attached Figure Description
[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is an exploded view of the compressed sofa in an embodiment of this utility model; Figure 2 This is a cross-sectional view of the compressed sofa in an embodiment of this utility model; Figures 3a-3b These are structural diagrams of the support mechanism at various angles in the embodiments of this utility model; Figure 4 This is a packing diagram of the support mechanism in an embodiment of this utility model; Figure 5 This is a packing diagram of the compressed sofa in this embodiment of the present invention; Figures 6a-6f This is a structural diagram of the compression sofa at various angles in an embodiment of this utility model.
[0021] The labels for the attached figures are as follows: 1. Support mechanism; 11. Support frame; 111. First vertical section; 112. Second vertical section; 113. Horizontal section; 12. Base; 121. Base plate; 1211. Through hole; 122. Support leg; 1221. Connecting part; 13. Threaded ear plate; 2. Seat cushion; 21. First mounting groove; 3. Backrest; 31. Second mounting groove; 4. Armrest; 41. Third mounting groove. Detailed Implementation
[0022] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.
[0023] It should be noted that the "backrest" and "armrest" mentioned in the embodiments of this application can be the backrest 3 and armrest 4 of upholstered furniture such as soft beds, compressed sofas, soft sofas, and chairs, and should specifically correspond to which backrest 3 and armrest 4 depending on the specific application of the support mechanism 1. Specifically, in the embodiments below, the backrest 3 and armrest 4 are the backrest 3 and armrest 4 of a compressed sofa.
[0024] Reference Figures 1 to 6f As shown, this invention illustrates an embodiment of the support mechanism 1 and the compression sofa. The support mechanism 1 includes at least two support frames 11 and a base 12. The support frames 11 are provided on both adjacent sides of the base 12, and the base 12 is detachably connected to the support frames 11. During installation, the support frames 11 are vertically mounted on the upper end of the base 12. The support frame 11 on one side of the base 12 is embedded in the backrest 3, and the support frame 11 on the other side of the base 12 is embedded in the armrest 4.
[0025] Specifically, the support mechanism 1 is used to support the backrest 3 and armrest 4, thereby preventing the backrest 3 and armrest 4 from becoming unstable and tilting or sagging. The support mechanism 1 includes a support frame 11 and a base 12. The support frame 11 is used to support the backrest 3 and armrest 4, and the base 12 is used to support the support frame 11 and the seat cushion 2. There are at least two support frames 11, which are detachably connected to the adjacent sides of the base 12. That is, the support frame 11 needs to be detachably installed on one side of the base 12, and the support frame 11 also needs to be detachably installed on the other adjacent side of the base 12, so that the support frame 11 on one side of the base 12 can support the backrest 3, and the support frame 11 on the adjacent side of the base 12 can support the armrest 4.
[0026] During transportation, the support frame 11 and the base 12 are detached. The support frame 11, the base 12, the backrest 3, the seat cushion 2, and the armrest 4 are disassembled and compressed into a box to increase the packing volume during transportation and reduce transportation costs.
[0027] When installing the support mechanism 1, backrest 3, and armrest 4, the support frame 11 needs to be installed on the adjacent sides of the base 12 first. The support frame 11 is installed vertically on the base 12. Vertical installation means that the support frame 11 and the base 12 can be installed vertically or at an angle. The support frame 11 needs to be vertically positioned above the base 12, and the installation angle must ensure that the support frame 11 can stably support the backrest 3 or armrest 4. The specific installation angle is not limited here and can be freely designed according to the actual size and shape of the backrest 3 and armrest 4. In this embodiment, the installation angle between the support frame 11 and the base 12 is 90°. The installation and disassembly of the support frame 11 and the base 12 are simple, allowing users to easily and quickly assemble and disassemble them.
[0028] After the support frame 11 is fixedly installed on the base 12, the seat cushion 2 is then placed on the top of the base 12. The base 12 provides support for the seat cushion 2, preventing the seat cushion 2 from directly contacting the ground, thus avoiding the seat cushion 2 from becoming damp and moldy or being inconvenient for the user to clean. The seat cushion 2 has a groove to avoid the support frame 11. To ensure that the support frame 11 supports the backrest 3 and armrest 4, the height of the support frame 11 needs to be greater than the height of the seat cushion 2.
[0029] Finally, the backrest 3 and armrest 4 are installed on the top of the seat cushion 2. Both the backrest 3 and the armrest 4 are provided with slots, so that the support frame 11 can be embedded inside the backrest 3 or the armrest 4. This allows the support frame 11 to provide stable support for the backrest 3 and the armrest 4, preventing the backrest 3 and the armrest 4 from tilting or sagging. At the same time, embedding the support frame 11 inside the backrest 3 and the armrest 4 can hide the support mechanism 1, thereby improving the aesthetics of the furniture.
[0030] In this embodiment, by setting the support mechanism 1, the support frame 11 is detachably installed on both adjacent sides of the base 12. During assembly, the support frame 11 is assembled onto the base 12. The support frame 11 on one side of the base 12 is used to stably support the backrest 3, and the support frame 11 on the other side of the base 12 is used to stably support the armrest 4, so that the backrest 3 and armrest 4 have fixed support components inside, so that they can be stably supported and prevent the backrest 3 and armrest 4 from tilting or sagging. At the same time, the support mechanism 1 enhances the three-dimensionality of the sofa, thereby improving its aesthetics. Furthermore, during transportation, the support frame 11 is in a detached state and is stacked with the base 12 before being packed together with the compressed backrest 3, seat cushion 2, and armrest 4, increasing the packing rate and reducing transportation costs.
[0031] In one embodiment, reference is made to Figures 1 to 4As shown, the support frame 11 is a bent tubular structure, with its two ends spaced apart and fixed to the upper end of the base 12. Specifically, the support frame 11 is a tubular structure, meaning it is formed by bending a single support tube. The two ends of the support frame 11 are spaced apart and fixed to the upper sides of the base 12, thus ensuring the support frame 11 is stably fixed to the base 12 and improving the structural strength of the support mechanism 1. Simultaneously, the support frame 11 has a simple structure and low production cost; furthermore, the support frame 11 has a certain length, improving its support stability and further preventing the backrest 3 and armrest 4 from tilting or sagging.
[0032] In a specific embodiment, refer to Figures 1 to 4 As shown, the support frame 11 includes a first vertical section 111, a second vertical section 112, and a horizontal section 113. The two ends of the horizontal section 113 are respectively fixedly connected to the first vertical section 111 and the second vertical section 112. The bottom ends of the first vertical section 111 and the second vertical section 112 are detachably connected to the base 12. Specifically, the first vertical segment 111 and the second vertical segment 112 are structural components that extend vertically upward relative to the base 12, and the horizontal segment 113 is horizontally arranged relative to the base 12. The top end of the first vertical segment 111 is fixedly connected to one end of the horizontal segment 113, and the bottom end of the first vertical segment 111 is detachably connected to the top end of the base 12. The top end of the second vertical segment 112 is fixedly connected to one end of the horizontal segment 113, and the bottom end of the second vertical segment 112 is detachably connected to the top end of the base 12. That is, the support frame 11 is an inverted "U" shaped frame. During installation, the bottom ends of the first vertical segment 111 and the second vertical segment 112 are fixedly connected to the base 12. The support frame 11 has a simple structure, low production cost, and high stability in supporting the backrest 3 and armrest 4.
[0033] In one embodiment, reference is made to Figures 1 to 6fAs shown, the base 12 includes a base plate 121 and a support foot 122. The support foot 122 is detachably connected to the bottom end of the base plate 121 and is located at the corner of the base plate 121. Specifically, the base plate 121 is used to support the seat cushion 2 and the support frame 11. The base plate 121 is a horizontal plate structure and can be a metal plate or a wooden board. The support legs 122 are used to support the base plate 121 so that the sofa as a whole is away from the ground, ensuring the cleanliness of the sofa and preventing mold and dampness. At the same time, the support legs 122 make the sofa consistent with conventional sofas, with the same appearance and usage effect as fixed sofas, improving the aesthetics and practicality of furniture with the support mechanism 1. Furthermore, since the base plate 121 and the support legs 122 are detachably connected, they can be disassembled and packed during packaging, making the packing volume much larger than that of conventional fixed sofas, reducing transportation costs, and preventing the base plate 121 or the support legs 122 from being damaged during transportation.
[0034] Furthermore, the support foot 122 and the base plate 121 are connected by threads, which simplifies the connection and improves the user's disassembly and assembly efficiency.
[0035] In a specific embodiment, refer to Figures 3a to 3b As shown, the base plate 121 has a through hole 1211, and the base plate 121 also has a support leg 122 directly below the support frame 11. The support leg 122 has a connecting part 1221, which passes through the through hole 1211 and is detachably connected to the support frame 122. Specifically, the support frame 11 and the support leg 122 are located on the upper and lower sides of the base plate 121, respectively, and the support frame 11, the base plate 121, and the support leg 122 are connected through the connection of the support frame 11 and the support leg 122. The support foot 122 is provided below the end of the base plate 121 directly opposite the end of the support frame 11. That is, the support foot 122 is not only provided at the corner of the base plate 121, but also below the support frame 11. The base plate 121 is provided with a through hole 1211 corresponding to the positions of the support frame 11 and the support foot 122. The through hole 1211 is used to avoid the connecting part 1221 of the support foot 122, so that one end of the connecting part 1221 of the support foot 122 passes through the through hole 1211 from below the base plate 121 to the upper side of the base plate 121. The connecting part 1221 is fixedly connected to the support frame 11, thereby realizing the fixed connection between the support foot 122 and the support frame 11, so that the support foot 122 is stably fixed below the base plate 121, and the support frame 11 is stably fixed above the base plate 121.
[0036] In this embodiment, by connecting the support foot 122 and the support frame 11, the base plate 121, the support frame 11 and the support foot 122 can be installed. At the same time, the support foot 122, which is not connected to the support frame 11, is directly fixedly connected to the base 12. Therefore, the installation method of the support mechanism 1 is simple, the amount of installation is reduced and the user experience is improved.
[0037] In a specific embodiment, refer to Figures 2 to 4 As shown, a threaded lug plate 13 is fixedly provided at the bottom end of the support frame 11. The connecting part 1221 is a screw, which passes through the through hole 1211 and is locked and fixed to the threaded lug plate 13. Specifically, the threaded lug plate 13 is a metal connecting plate with a threaded hole. The threaded lug plate 13 is used to fix the support frame 11 and the support leg 122. The connecting part 1221 of the support leg 122 is a screw, so that one end of the screw passes through the through hole 1211 and is locked and fixed to the threaded lug plate 13. The support frame 11 and the support leg 122 are fixedly connected by a threaded connection. The connection method is simple, easy for users to assemble and disassemble, and has low production cost.
[0038] Furthermore, the bottom end of the support frame 11 is welded and fixed to the threaded lug plate 13 to improve the stability of the support frame 11 and the threaded lug plate 13, preventing the threaded lug plate 13 from falling off. This fixing method is simple and has low production costs. More specifically, the threaded lug plate 13 is an M8 threaded lug plate. More specifically, the support frame 11 has a tubular structure, and the threaded lug plate 13 is welded to the end of the support frame 11, allowing the end of the support frame 11 to be detachably connected to the support leg 122, improving installation stability and ease of installation, and reducing production costs.
[0039] In one embodiment, reference is made to Figures 3a to 4 As shown, the corners of the support frame 11 are arc-shaped, which prevents the support frame 11 from having sharp structures and avoids damage to the backrest 3 and armrest 4 when the support frame 11 is embedded in the backrest 3 and armrest 4. At the same time, it can also improve the smoothness of the support frame 11 when it is embedded in the backrest 3 and armrest 4, and improve the assembly efficiency.
[0040] In a specific embodiment, refer to Figures 3a to 4As shown, the support mechanism 1 includes two support frames 11, which are located at opposite ends of the diagonal of the base 12. Specifically, the base 12 is provided with only two support frames 11. One support frame 11 is detachably mounted on one side of the base 12, and the other support frame 11 is detachably mounted on the adjacent side of the base 12. This allows one support frame 11 to support the backrest 3 and the other support frame 11 to support the armrest 4. The two support frames 11 are located at opposite ends of the diagonal of the base 12, thereby increasing the distance between the two support frames 11 and improving the stability of the support provided by the two support frames 11 to the backrest 3 and the armrest 4, further preventing the backrest 3 and the armrest 4 from tilting or sagging.
[0041] In one embodiment, a plurality of support frames 11 (not shown in the figure) are fixedly provided on one side of the base 12. The plurality of support frames 11 are spaced apart along one side of the base 12. That is, a plurality of support frames 11 are spaced apart on one side of the base 12 relative to the backrest 3 or the armrest 4. The plurality of support frames 11 provide stable support for the backrest 3 or the armrest 4, thereby further improving the support stability of the support mechanism 1 for the backrest 3 or the armrest 4.
[0042] In one embodiment, the support frame 11 is integrally formed to improve the structural stability and production efficiency of the support frame 11, while also increasing the service life of the support frame 11.
[0043] Reference Figures 1 to 2 , Figures 5 to 6f As shown, this embodiment also provides a compression sofa, which includes a seat cushion 2, a backrest 3, armrests 4, and a support mechanism 1. The backrest 3 and armrests 4 are located at the top of the seat cushion 2. The support mechanism 1 can be any type of support mechanism 1 provided by this utility model. Since the specific structure and working principle of the support mechanism 1 have been described in detail in the previous description, they will not be repeated here for the sake of brevity. The base 12 is located at the bottom of the seat cushion 2. The support frame 11 on one side of the base 12 is embedded in the seat cushion 2 and the backrest 3, and the support frame 11 on the other side of the base 12 is embedded in the seat cushion 2 and the armrests 4.
[0044] The compressed sofa in this embodiment utilizes the support mechanism 1 provided by this invention. The support mechanism 1 supports the seat cushion 2, backrest 3, and armrests 4, preventing the backrest 3 and armrests 4 from tilting or sagging, thus increasing the stability of the compressed sofa and improving the user experience. Simultaneously, the support mechanism 1 enhances the regularity and three-dimensionality of the compressed sofa, improving its aesthetics. Furthermore, it enables the compressed sofa to function as a fixed sofa, increasing its practicality. Moreover, the packing capacity of the compressed sofa is significantly greater than that of a conventional fixed sofa, thereby enhancing its market competitiveness.
[0045] In one embodiment, Figures 6a-6f The seat cushion 2 is provided with a first mounting groove 21 that runs through its upper and lower ends, the backrest 3 is provided with a second mounting groove 31 that opens upward from its bottom end, the armrest 4 is provided with a third mounting groove 41 that opens upward from its bottom end, one end of the support plate on one side of the base 12 passes through the first mounting groove 21 and is embedded in the second mounting groove 31, and one end of the support plate on the other side of the base 12 passes through the first mounting groove 21 and is embedded in the third mounting groove 41. Specifically, the seat cushion 2 has a first mounting groove 21 at the position corresponding to the support frame 11. Since the armrest 4 and the backrest 3 are both located above the seat cushion 2, the first mounting groove 21 needs to pass through both the upper and lower ends of the seat cushion 2 so that the support frame 11 can pass through the first mounting groove 21 and be embedded in the backrest 3 or the armrest 4. The second mounting groove 31 and the third mounting groove 41 are both used to accommodate the support frame 11, so that the support frame 11 can be hidden in the seat cushion 2, the backrest 3 and the armrest 4, thereby improving the aesthetics of the compressed sofa and also improving the support stability of the support frame 11 for the backrest 3 and the armrest 4.
[0046] More specifically, the compressed sofa also includes a filling element for filling the second mounting slot 31 and the third mounting slot 41, and the filling element is located on the outside of the support frame 11, thereby preventing the support frame 11 from being exposed on the outside of the compressed sofa and further improving the aesthetics of the compressed sofa.
[0047] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.
Claims
1. A support mechanism, characterized in that, include: At least two support frames; The base has support frames on both adjacent sides, and the base and the support frames are detachably connected. During installation, the support frame is vertically installed on the upper end of the base, the support frame on one side of the base is embedded in the backrest, and the support frame on the other side of the base is embedded in the armrest.
2. The support mechanism according to claim 1, characterized in that, The support frame is a bent tubular structure, with its two ends spaced apart and detachably connected to the upper end of the base.
3. The support mechanism according to claim 2, characterized in that, The support frame includes a first vertical section, a second vertical section, and a horizontal section. The two ends of the horizontal section are fixedly connected to the first vertical section and the second vertical section, respectively. The bottom ends of the first vertical section and the second vertical section are detachably connected to the base.
4. The support mechanism according to claim 1, characterized in that, The base includes a base plate and support feet. The support feet are detachably connected to the bottom end of the base plate and are located at the corner of the base plate.
5. The support mechanism according to claim 4, characterized in that, The base plate has a through hole, and the base plate is also provided with a support foot directly below the support frame. The support foot is provided with a connecting part, which passes through the through hole and is detachably connected to the support frame.
6. The support mechanism according to claim 5, characterized in that, The bottom end of the support frame is fixed with a threaded lug plate, and the connecting part is a screw rod, which passes through the through hole and is locked and fixed to the threaded lug plate.
7. The support mechanism according to claim 6, characterized in that, The bottom end of the support frame is welded and fixed to the threaded ear plate.
8. The support mechanism according to claim 1, characterized in that, The corners of the support frame are arc-shaped.
9. The support mechanism according to claim 1, characterized in that, The support frame is provided in two parts, and the two support frames are respectively located at opposite ends of the diagonal of the base.
10. The support mechanism according to claim 1, characterized in that, A plurality of support frames are fixedly provided on one side of the base, and the plurality of support frames are spaced apart along one side of the base.
11. The support mechanism according to claim 1, characterized in that, The support frame is integrally formed.
12. A compressed sofa, characterized in that, include: cushion; A backrest and armrests, the backrest and armrests being located at the top of the seat cushion; A support mechanism, wherein the support mechanism is the support mechanism according to any one of claims 1-11, the base is located at the bottom end of the seat cushion, the support frame on one side of the base is embedded in the seat cushion and the backrest, and the support frame on the other side of the base is embedded in the seat cushion and the armrest.
13. The compression sofa according to claim 12, characterized in that, The seat cushion has a first mounting groove that runs through its upper and lower ends, the backrest has a second mounting groove that opens upward from its bottom end, the armrest has a third mounting groove that opens upward from its bottom end, one end of the support frame on one side of the base passes through the first mounting groove and is embedded in the second mounting groove, and one end of the support frame on the other side of the base passes through the first mounting groove and is embedded in the third mounting groove.