A double-circle handrail and main body frame stable matching structure of a functional sofa

Abstract

The utility model relates to the main body frame stable cooperation structure of double circle handrail and function sofa. The structure includes: handrail frame, contain lower handrail frame and set on its upper handrail frame, two limit out the superimposed double cylinder external contour, and the bottom bearing frame has in the bottom of lower handrail frame;Sofa main body frame forms the area of sitting and backrest;Linking support subassembly, including linking in the front linking plate and rear linking end plate group between sofa main body frame and handrail frame. The front linking plate and rear linking end plate group are respectively connected to the front and rear sides of sofa main body frame and oppositely arranged, and the embedded space is formed by surrounding, and the bottom bearing frame of handrail frame is placed in this space. The front linking plate and rear linking end plate group all have arc-shaped notches, and the double cylinder modeling of handrail frame is adapted. The scheme can solve the visual gap of double arc handrail and sofa main body frame linking place, the insufficient connection strength and the poor support problem of cushion transition area, realize seamless linking, stable connection and smooth transition.

Description

Technical Field

[0001] This utility model relates to the field of furniture structural design, and in particular to a stable cooperation structure between double round armrests and the main frame of a functional sofa. Background Technology

[0002] In modern home furnishing product development, functional sofas are becoming increasingly popular due to their adjustable sitting and reclining modes, and their requirements for structural stability are far higher than those for traditional sofas. As a key visual and load-bearing element of the sofa, the armrests are becoming increasingly complex in design, especially the double-arc design, which is highly favored for its smooth lines and high-end texture.

[0003] However, in the field of functional sofas, the connection between such armrests and the main frame faces even more severe technical challenges. The main frame of a functional sofa is more complex due to its built-in drive mechanism and moving parts, and the connection points between the armrests and the main frame need to withstand continuously changing dynamic loads during frequent posture adjustments. The double-arc armrests, with their overlapping double cylinder outlines, differ fundamentally in geometric characteristics from the typically straight or regular geometric shapes of the main frame, making it difficult to achieve seamless and stable connections using traditional joining techniques. In actual assembly, visible gaps or uneven steps are easily formed at the joints, which not only disrupts the overall visual continuity of the product and weakens its high-end quality feel, but can also become potential sources of dirt accumulation and structural stress concentration.

[0004] Furthermore, existing connection methods mostly rely on basic screw fixing or surface gluing. These methods are clearly insufficient in terms of connection strength when functional sofas are subjected to long-term, multi-directional dynamic loads (such as vibrations from user leaning, standing, and mechanical operation), easily leading to loosening, deformation, and even abnormal noise, seriously affecting the product's lifespan and safety. Particularly noteworthy is the issue of inadequate support structure design in the transition area between the armrests and seat cushions. If this design is flawed, it will directly result in a loss of localized support for the filling core when the sofa's shape changes. Over time, this area is prone to irreversible collapse, damaging both aesthetic harmony and significantly reducing seating comfort. For modern functional sofas that prioritize integrated design and reliability, how to ensure extreme structural stability while perfectly adapting to the double-cylinder shape and achieving a smooth support transition in the seat cushion area has become a core challenge that the industry urgently needs to overcome. Summary of the Invention

[0005] To address the aforementioned issues, the present invention aims to provide a robust joint structure between the double-circular armrests and the main frame of a functional sofa. This structure resolves the technical problems of visual gaps, insufficient connection strength, and poor support in the transition area of ​​the seat cushion at the joint between the double-circular armrests and the main frame of the sofa, achieving the advantages of seamless connection, stable connection, and smooth transition.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A structure for the stable connection between double-round armrests and the main frame of a functional sofa includes:

[0008] The handrail frame includes a lower handrail frame and an upper handrail frame disposed thereon. The upper handrail frame and the lower handrail frame together define the outer contour of the stacked double cylinders. A bottom load-bearing frame is provided at the bottom of the lower handrail frame.

[0009] The main frame of the sofa forms a seating area and a backrest area;

[0010] And connecting support components, including a front connecting plate and a rear connecting end plate assembly that connect the main frame of the sofa and the armrest frame;

[0011] The front connecting plate and the rear connecting end plate are respectively connected to the front and rear sides of the main frame of the sofa, and the two are set opposite to each other to form an embedded space. The bottom load-bearing frame of the armrest frame is set in the embedded space.

[0012] Both the front connecting plate and the rear connecting end plate are provided with arc-shaped notches to accommodate the double cylindrical shape of the handrail frame.

[0013] Furthermore, this application also proposes that a tenon block is provided on the bottom load-bearing frame, and when the bottom load-bearing frame is set in the embedded space, the tenon block is inserted into the tenon groove on the side of the main frame of the sofa to achieve a fixed connection.

[0014] Furthermore, this application also proposes to include a transition beam assembly, which is disposed between the front connecting plate and the rear connecting end plate assembly. The transition beam assembly includes multiple transition beams arranged in an arc-shaped support surface, which is used to support the seat cushion core to achieve a smooth transition and support from the main frame of the sofa to the armrest frame.

[0015] Furthermore, this application also proposes that the transition beam assembly includes a first mounting plate and a second mounting plate; multiple first transition beams are arranged front and rear between the front connecting plate and the first mounting plate, forming a first arc-shaped support surface; and multiple second transition beams are arranged front and rear between the second mounting plate and the rear connecting end plate assembly, forming a second arc-shaped support surface.

[0016] Furthermore, this application also proposes that the front connecting plate is connected to the front side of the seating area of ​​the main frame of the sofa, and that the side facing the armrest has an arc-shaped notch that matches the double cylindrical shape of the lower armrest frame.

[0017] Furthermore, this application also proposes that the rear connecting end plate assembly is connected to the side of the backrest area of ​​the main frame of the sofa, and has an arc-shaped notch that matches the double cylindrical shape of the upper armrest frame and / or the lower armrest frame.

[0018] Further, the present application further provides that the rear connecting end plate set comprises a first rear connecting end plate and a second rear connecting end plate; the first rear connecting end plate is arranged at the rear edge of the side wall of the armrest frame, and is provided with upper and lower arc-shaped notches which are respectively adapted to an upper rear plate assembly of the upper armrest frame and a lower rear plate assembly of the lower armrest frame; the second rear connecting end plate is arranged at the front side of the first rear connecting end plate, and is provided with an upper arc-shaped notch adapted to the upper armrest frame.

[0019] Further, the present application further provides that the first rear connecting end plate and the second rear connecting end plate are connected by a plurality of connecting plates, and the connecting plates are inserted and fixed with dovetail grooves provided on the first and second rear connecting end plates through tenons.

[0020] Further, the present application further provides that the bottom load-bearing frame comprises:

[0021] a sun-shaped base plate;

[0022] two end plates arranged front and back, connected above the front and rear beams of the base plate through a mortise and tenon structure, wherein each end plate comprises an integrally formed arc-shaped connecting part and a side plate connecting part, the arc-shaped connecting part is semicircular and the arc side faces the inner side of the sofa seat;

[0023] a side plate, the lower end of which is connected to the side edge of the base plate through a mortise and tenon structure, and the front end and the rear end of which are respectively connected to the side plate connecting parts of the two front and rear end plates through a mortise and tenon structure.

[0024] Further, the present application further provides that a plurality of mortise eyes are provided on the arc edge of the arc-shaped connecting part of the end plate, and a strip-shaped through slot is provided on the straight edge thereof; the lower cross beam of the lower armrest frame comprises an inserting cross beam and a penetrating cross beam; two ends of the inserting cross beam are provided with tenons, and the tenons are inserted into the mortise eyes; the penetrating cross beam penetrates the strip-shaped through slot; a middle vertical plate is further included, the middle vertical plate is erected on the middle beam of the base plate through a mortise and tenon structure, and a strip-shaped through slot is provided on the vertical edge thereof; the middle part of the inserting cross beam is supported on the middle vertical plate, and the penetrating cross beam simultaneously penetrates the strip-shaped through slot on the middle vertical plate.

[0025] It can be seen from the above that the present application provides a stable fitting structure of a double-circular armrest and a main frame of a functional sofa. Through the embedded space design, the bottom load-bearing frame is completely accommodated in the main sofa frame, and the arc-shaped notches cooperate to accurately adapt to the shape of double cylinders, which effectively eliminates visual gaps and improves connection strength; meanwhile, the synergistic effect of the connecting support assembly and the transition beam assembly ensures uniform distribution of supporting force in the cushion area and avoids local collapse. The structure has the advantages of solving the technical problems that visual gaps are easily generated at the joint between the double-arc armrest and the main sofa frame, the connection strength is insufficient and the support of the cushion transition area is poor, and realizing seamless joint, stable connection and smooth transition. Description of Drawings

[0026] Figure 1 This application provides a schematic diagram of a stable connection structure between a double-circle armrest and the main frame of a functional sofa.

[0027] Figure 2 The present application provides a schematic diagram of the connection between the connecting support component and the main frame of the sofa.

[0028] Figure 3 A schematic diagram of the connecting support components provided for this application (including the side panels of the sofa's main frame).

[0029] Figure 4 This is a structural diagram of the handrail frame.

[0030] Figure 5 This is a schematic diagram of the bottom load-bearing frame of the handrail.

[0031] Figure 6 This is a diagram showing the storage configuration of a functional sofa using the aforementioned connection structure.

[0032] Figure 7 This is a diagram showing the unfolded state of a functional sofa using the aforementioned connecting structure. Detailed Implementation

[0033] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] like Figure 1-7 As shown in the embodiment of this application, a stable fit structure between a double-round armrest and the main frame of a functional sofa is proposed, including: an armrest frame 1, including a lower armrest frame 2 and an upper armrest frame 3 disposed thereon, the upper armrest frame 3 and the lower armrest frame 2 together define the outer contour of the stacked double cylinders, and a bottom load-bearing frame 4 is provided at the bottom of the lower armrest frame 2; a sofa main frame 5, which forms a seating area and a backrest area; and a connecting support component 6, the connecting support component 6 including a front connecting plate 7 and a rear connecting end plate assembly 8 connected between the sofa main frame 5 and the armrest frame 1; the front connecting plate 7 and the rear connecting end plate assembly 8 are respectively connected to the front and rear sides of the sofa main frame 5, and are arranged opposite to each other, together enclosing an embedded space 100, and the bottom load-bearing frame 4 of the armrest frame 1 is disposed in the embedded space 100; both the front connecting plate 7 and the rear connecting end plate assembly 8 are provided with arc-shaped notches 101 to adapt to the double-cylinder shape of the armrest frame 1.

[0039] The handrail frame 1 can be understood as a support structure with a specific geometric shape, forming a double-cylinder outer contour through the combination of upper and lower parts. Specifically, the upper handrail frame 3 and the lower handrail frame 2 can be fixedly connected by welding, bolting, or integral molding to ensure the stability of the overall structure. Furthermore, the design of the bottom load-bearing frame 4 can be achieved in various ways, such as by splicing metal profiles into a frame structure, using high-strength plastic injection molding, or forming a template with a mortise and tenon structure. Its main purpose is to provide additional support for the handrail frame 1 and facilitate subsequent embedded connection with other components.

[0040] In practical applications, the sofa's main frame 5, as the core load-bearing component of the overall structure, can be made of wood, metal, or composite materials. For example, wood can be assembled using mortise and tenon joints, while metal can be connected by welding or bolts to form a frame structure. The division between the seating area and the backrest area can be achieved by setting partitions or support beams inside the frame, thereby clearly defining functional zones and enhancing overall strength. The front connecting plate 7 and the rear connecting end plate assembly 8 in the connecting support component 6 can achieve their functions in various ways. For example, the front connecting plate 7 and the rear connecting end plate assembly 8 can be fixed to the sofa's main frame 5 using bolts, rivets, adhesives, or mortise and tenon joints. Furthermore, the design of the arc-shaped notch 101 can be achieved through machining, stamping, or injection molding, its main purpose being to adapt to the double-cylinder shape of the armrest frame 1, thereby ensuring a tight fit between the two.

[0041] The working principle of this application embodiment is as follows: A stable joint structure between a double-circular armrest and the main frame of a functional sofa achieves its function through the synergistic action of multiple key components. The armrest frame 1 is formed by stacking a lower armrest frame 2 and an upper armrest frame 3 to form a double cylindrical outer contour. The bottom load-bearing frame 4 is located at the bottom of the lower armrest frame 2, providing a structural foundation for the double-circular arc shape and concentrating the load at the bottom for subsequent embedding and connection. The sofa main frame 5 forms the seating area and backrest area, serving as an overall support carrier to ensure the stability of the main structure. The connecting support component 6 includes a front connecting plate 7 and a rear connecting end plate assembly 8, which are respectively connected to the front and rear sides of the sofa main frame 5 and arranged opposite each other, together enclosing an embedding space 100. The bottom load-bearing frame 4 is embedded in this embedding space 100. This embedding method eliminates the visual gap at the connection point, and at the same time, disperses lateral forces through spatial constraints, effectively preventing loosening and deformation. Furthermore, both the front connecting plate 7 and the rear connecting end plate assembly 8 are provided with arc-shaped notches 101 to adapt to the double-cylinder shape of the armrest frame 1, ensuring a precise match of the contours at the connection point. This achieves a smooth visual transition, avoiding a step-like appearance, and provides a uniform support surface for the seat cushion, preventing localized collapse. Thus, the various features work together to ensure that the embedded space 100 and the arc-shaped notches 101 seamlessly embed the armrest frame 1 into the main frame. The bottom load-bearing frame 4 provides a stable stress point within the embedded space 100, and the overall layout of the connecting support components 6 disperses stress during leaning, thereby ensuring structural strength while achieving a smooth shape and uniform support. Specifically, this design not only solves the visual gap and step-like problem at the connection between the double-arc armrest and the sofa main frame 5, but also overcomes the problem of loosening and deformation caused by insufficient connection strength, as well as the problem of localized seat cushion collapse caused by uneven support. As a preferred embodiment, this technical solution systematically optimizes the connection effect between the double-arc armrest and the sofa main frame 5 through embedded connection design and contour adaptation.

[0042] In a further optimized design, a tenon block 9 is provided on the bottom load-bearing frame 4. When the bottom load-bearing frame 4 is installed within the embedding space 100, the tenon block 9 engages with the tenon groove 10 on the side of the sofa main frame 5 to achieve a fixed connection. Specifically, the tenon block 9 refers to a mechanically mating component with a protruding structure, which can be implemented in different shapes such as rectangular, trapezoidal, or cylindrical. The tenon groove 10 can be understood as a groove structure adapted to the tenon block 9, and its depth and width must strictly match the dimensions of the tenon block 9 to achieve a tight fit. In addition, the embedding space 100 refers to the accommodating area formed by the front connecting plate 7 and the rear connecting end plate assembly 8, and its design must consider the guidance and tolerance range during the assembly process. In detail, this technical solution, by setting the tenon block 9 on the bottom load-bearing frame 4, allows it to naturally align with the tenon groove 10 on the side of the sofa main frame 5 during installation, utilizing the elastic deformation characteristics of the material or precision machining tolerances to form a self-locking tight fit. This mechanical connection method not only avoids the problems of loosening or insufficient bonding strength of traditional screw fixing, but also effectively disperses lateral forces, preventing the frame from shifting under dynamic loads. Considering that the armrest frame 1 needs to withstand large lateral forces, this fixing method significantly improves the overall stability of the structure. At the same time, since the tenon block 9 and the tenon groove 10 can be assembled efficiently without additional adjustments, this not only simplifies the manufacturing process, but also maintains the sofa's clean and streamlined appearance.

[0043] like Figure 1-3 As shown, this embodiment also includes a transition beam assembly, which is disposed between the front connecting plate 7 and the rear connecting end plate group 8. It includes multiple transition beams arranged in an arc-shaped support surface. The arc-shaped support surface is used to support the seat core 13, so as to achieve a smooth transition and support from the main frame 5 of the sofa to the armrest frame 1.

[0044] Specifically, the transition beam assembly refers to a structural unit that provides continuous support between the main sofa frame 5 and the armrest frame 1. It can be made of materials such as metal, wood, or high-strength plastic, and its specific form can be adjusted according to actual needs. The transition beam is the core component of the transition beam assembly, forming an arc-shaped support surface through a specific arrangement. This arc-shaped support surface is designed to fit the double-cylinder outer contour of the armrest frame 1, thereby ensuring uniform distribution of support force and maintaining visual smoothness. Furthermore, the arc-shaped support surface is a curved structure based on optimized geometric design. It can be achieved by combining and splicing multiple independent transition beams or by manufacturing a single integral molding process, aiming to provide stable and uniform support for the seat cushion core 13. In detail, the transition beam assembly is located between the front connecting plate 7 and the rear connecting end plate group 8, fully utilizing the structural gaps around the embedded space 100 formed by the connecting support components 6, thus avoiding the support discontinuity problem at the junction of the main sofa frame 5 and the armrest frame 1. Multiple transition beams are arranged in a pre-defined arc shape, their arc design precisely matching the outer contour of the double cylinders of the armrest frame 1, thus maintaining the natural and smooth lines of the sofa's overall design. Simultaneously, the arc-shaped support surface, through the synergistic effect of the multiple transition beams, dynamically transmits the pressure of the seat cushion core 13 to the entire connecting area, effectively preventing localized stress concentration and the collapse of the filling material due to long-term use. This design not only strengthens the structural strength of the transition area from the main sofa frame 5 to the armrest frame 1 but also enhances the product's durability and aesthetic integrity through the combination of form and function. Furthermore, the transition beam assembly, together with the front connecting plate 7 and the rear connecting end plate assembly 8, forms a complete support system, further enhancing the overall structural stability of the sofa.

[0045] In a specific implementation scheme, the transition beam assembly includes a first mounting plate 14 and a second mounting plate 15; multiple first transition beams 16 are arranged front and rear between the front connecting plate 7 and the first mounting plate 14, forming a first arc-shaped support surface; multiple second transition beams 17 are arranged front and rear between the second mounting plate 15 and the rear connecting end plate assembly 8, forming a second arc-shaped support surface. Specifically, the first mounting plate 14 and the second mounting plate 15 are structural components used to separate the transition area. They can be made of materials such as metal sheets, high-strength plastic sheets, or wood composite boards, with the purpose of providing a stable mounting foundation for the transition beams and optimizing the partitioning of different height profiles of the armrest frame 1. The first transition beam 16 is a support member extending from the front connecting plate 7 to the first mounting plate 14. It can be fixed by welding, bolting, or mortise and tenon joints, with the purpose of precisely matching the cylindrical shape of the lower armrest frame 2 to ensure a smooth transition of the front support of the seat cushion. The second transition beam 17 refers to the supporting component extending from the second mounting plate 15 to the rear connecting end plate group 8. It can also be fixed in a variety of ways to adapt to the cylindrical shape of the upper armrest frame 3 and handle the transition requirements of the backrest area.

[0046] In detail, this solution divides the transition area into independent front and rear sections through a segmented design, allowing for targeted optimization of armrest contours at different heights. The first mounting plate 14 and the second mounting plate 15 serve as structural dividing points, effectively avoiding the limitations of a single support surface that cannot adapt to a double-layered design. The first arc-shaped support surface, formed by multiple first transition beams 16, is designed according to the spatial layout between the front connecting plate 7 and the first mounting plate 14, precisely matching the cylindrical shape of the lower armrest frame 2. This ensures a smooth connection between the front support of the seat cushion and the main sofa frame 5, preventing stress concentration caused by abrupt contour changes. Simultaneously, the second arc-shaped support surface, formed by multiple second transition beams 17, is designed according to the positional relationship between the second mounting plate 15 and the rear connecting end plate assembly 8. This adapts to the cylindrical shape of the upper armrest frame 3, ensuring a seamless fit between the rear support of the seat cushion and the armrest contour, evenly distributing pressure on the seat cushion core 13, thereby eliminating the risk of localized collapse and improving overall structural stability. The above design, while ensuring structural stability, achieves a natural and smooth connection between the armrest contour and the main frame, significantly improving riding comfort and product durability.

[0047] exist Figure 1-3In the illustrated design, the front connecting plate 7 is connected to the front side of the seating area of ​​the sofa main frame 5. Its side facing the armrest has an arc-shaped notch 101 that matches the double-cylinder shape of the lower armrest frame 2. Specifically, the front connecting plate 7 is a key component connecting the sofa main frame 5 and the armrest frame 1. It can be made of metal sheet, high-strength plastic, or wood, aiming to provide stable structural support and achieve precise shape matching. The arc-shaped notch 101 can be understood as a groove structure precisely designed according to the outer contour of the double cylinders of the lower armrest frame 2. It can be achieved through CNC machining, mold forming, or manual finishing, ensuring a seamless fit between the front connecting plate 7 and the lower armrest frame 2. In detail, the front connecting plate 7 is precisely positioned and installed on the front side of the seating area of ​​the sofa main frame 5. This position ensures precise correspondence with the boundary of the seating area, avoiding misalignment due to positioning deviations. The arc-shaped notch 101 is designed to precisely match the actual contour of the lower armrest frame 2, achieving a seamless fit between the notch and the armrest shape. This eliminates visual gaps or structural steps caused by inconsistent shapes in traditional designs. This design not only ensures the continuous smoothness of the sofa's appearance but also significantly improves the structural stability and durability. Furthermore, the coordinated design of the front connecting plate 7 and the embedded space 100 further enhances the overall connection strength between the armrest frame 1 and the main sofa frame 5, effectively solving the problem of loosening that may occur during long-term use.

[0048] like Figure 1-3As shown, the rear connecting end plate assembly 8 is connected to the side of the backrest area of ​​the sofa main frame 5, and has an arc-shaped notch 101 that matches the double cylindrical shape of the upper armrest frame 3 and / or the lower armrest frame 2. Specifically, the rear connecting end plate assembly 8 is a key component used to connect the sofa main frame 5 and the armrest frame 1. It can be made of metal sheet, high-strength plastic, or wood composite material, with the aim of providing sufficient structural strength to support the armrest frame 1. The design of the arc-shaped notch 101 can be achieved through CNC machining, mold forming, or manual trimming according to actual needs. Its purpose is to precisely match the double cylindrical shape of the armrest frame 1 and ensure a tight fit at the joint. In detail, the rear connecting end plate assembly 8 is precisely positioned and installed on the side of the backrest area of ​​the sofa main frame 5. This position ensures that the component can directly act on the specific geometry of the backrest area. The arc-shaped notch 101 is customized according to the actual contour differences between the upper armrest frame 3 and the lower armrest frame 2, so that the edge of the notch can completely fit the cylindrical surface of the armrest frame 1. This design not only eliminates the gaps caused by inconsistent shapes in traditional universal notch designs, but also enhances the adaptability of the overall structure, ensuring a seamless transition in the backrest area. By firmly connecting the rear connecting end plate assembly 8 to the main sofa frame 5, and in conjunction with the precisely designed curved notch 101, the problem of visible gaps or steps easily appearing at the joint of the backrest area is effectively solved, thereby maintaining the high-end texture of the sofa's appearance and the long-term durability of the structure.

[0049] In a specific implementation scheme, the rear connecting end plate assembly 8 includes a first rear connecting end plate 18 and a second rear connecting end plate 19. The first rear connecting end plate 18 is located at the rear edge of the side wall of the handrail frame 1, and has upper and lower arc-shaped notches that respectively adapt to the upper rear plate assembly 20 of the upper handrail frame 3 and the lower rear plate assembly 21 of the lower handrail frame 2. The second rear connecting end plate 19 is located on the front side of the first rear connecting end plate 18, and has an upper arc-shaped notch that adapts to the upper handrail frame 3. Specifically, the first rear connecting end plate 18 refers to the support component located at the rear edge of the side wall of the handrail frame 1, which aims to provide stable rear support and adapt to the contour differences between the upper and lower handrail frames. The second rear connecting end plate 19 can be understood as an auxiliary support component, which optimizes the transition requirements of the upper handrail frame 3 through a front-mounted layout. Specifically, it can achieve a precise match with the upper handrail frame 3 by adjusting the curvature of the arc-shaped notch. The arc-shaped notch is designed to adapt to the double cylindrical shape, and can be achieved by CNC machining or mold forming, with the aim of eliminating gaps or steps at the joint.

[0050] In detail, the above solution uses a split design to decompose the rear connecting end plate assembly 8 into two independent end plates, thereby achieving a refined fit to the complex contours of the rear area of ​​the armrest frame 1. The first rear connecting end plate 18 is located at the rear edge of the side wall of the armrest frame 1. Based on the characteristic of this location as a key stress point, it ensures the stability of the rear support. Its upper and lower arc-shaped notches are respectively adapted to the upper rear plate assembly 20 of the upper armrest frame 3 and the lower rear plate assembly 21 of the lower armrest frame 2. This targeted design effectively solves the joint problem caused by the difference in the contours of the upper and lower parts. The second rear connecting end plate 19 enhances the smooth transition from the backrest to the armrest through its front-mounted layout. Its upper arc-shaped notch is specifically adapted to the upper armrest frame 3, avoiding the risk of deformation that may be caused by local stress concentration. Overall, the positions and notch designs of the first and second rear connecting end plates 18 and 19 complement each other, achieving a precise match for the double cylindrical shape and improving the aesthetics and durability of the joint. In addition, the aforementioned rear connecting end plate group 8, together with the front connecting plate 7 and the front and rear sides of the sofa main frame 5, form an embedded space 100, which further enhances the overall stability of the structure.

[0051] In the specific design, the first rear connecting end plate 18 and the second rear connecting end plate 19 are connected by multiple connecting plates 22. The connecting plates 22 are fixed to the first and second rear connecting end plates 18 and 19 by tenons 23 and tenon slots 10 provided on them. Specifically, the connecting plate 22 is a structural component that provides a mechanical connection between the first and second rear connecting end plates 18 and 19. It can be made of materials such as thin metal sheets, high-strength plastic sheets, or wood composite boards, aiming to evenly distribute lateral forces through multiple points and avoid localized stress concentration. The tenon slot 10 can be understood as a groove structure formed on the first and second rear connecting end plates 18 and 19, its shape adapted to the tenon 23. It can be precisely machined to achieve a tight fit to enhance connection rigidity. This technical solution, through the design of multiple connecting plates 22, distributes the lateral forces transmitted by the handrail frame 1 to multiple connection points, effectively avoiding deformation or loosening caused by excessive force at a single point. Meanwhile, the interlocking fixing method of the tenon 23 and the tenon groove 10 utilizes the elastic deformation characteristics of the material to ensure that the connection part has good shear and pull-out resistance during long-term use. Through the above design, not only is the problem of lack of reliable connection mechanism between the first rear connecting end plate 18 and the second rear connecting end plate 19 solved, but the overall stability and aesthetics of the connection between the double arc armrests and the main frame 5 of the sofa are further improved, ensuring that the sofa can still maintain smooth lines and high-end texture when subjected to lateral forces.

[0052] like Figure 4 and 5As shown, the bottom load-bearing frame 4 comprises: a Japanese-shaped base plate 24; two end plates 25 arranged front and back, connected above the front and rear beams of the base plate 24 via a mortise and tenon structure, wherein the end plate 25 comprises an integrally formed arc-shaped connecting portion 251 and a side plate connecting portion 252, the arc-shaped connecting portion 251 is semicircular and its arc side faces the inner side of the sofa seat; a side plate 26, whose lower end is connected to the side edge of the base plate 24 via a mortise and tenon structure, and whose front end portion and rear end portion are respectively connected to the side plate connecting portions 252 of the two front and rear end plates 25 via mortise and tenon structures. Specifically, the Japanese-shaped base plate 24 refers to a rectangular frame structure with an intermediate cross beam, which can be implemented by welding metal profiles or splicing wooden boards, and is intended to provide a core support foundation and uniformly分散 loads. Wherein, the integrally forming design of the end plate 25 refers to integrating the arc-shaped connecting portion 251 and the side plate connecting portion 252 into a single component, which can be implemented by injection molding or whole wood carving process, and is intended to ensure the integrity of the structure and accurately adapt to the armrest contour. In practical applications, the mortise and tenon structure is a traditional connection method, which can be implemented in various forms such as right-angle tenon, dovetail tenon, etc., and is intended to improve the connection strength and avoid loosening.

[0053] In detail, the bottom load-bearing frame 4 realizes stable support and uniform stress through organic cooperation among various components. As the core support member, the Japanese-shaped layout of the base plate 24 can effectively分散 complex loads from the armrest frame 1 and prevent local stress concentration. The end plate 25 is connected to the base plate 24 via the mortise and tenon structure, which not only improves the fatigue resistance, but also the arc-shaped connecting portion 251 can naturally guide the cushion pressure to diffuse uniformly toward the inside of the sofa, optimizing the support effect of the seating area. The fully closed frame system formed by the side plate 26, the base plate 24 and the end plate 25 greatly enhances the overall anti-lateral force capability, and can effectively分散 the impact force generated when a user leans against the sofa. The above structural design cooperates with the double-cylinder shape of the armrest frame 1, which not only ensures the fluency of visual transition, but also realizes the unification of structural stability and riding comfort.

[0054] This application further proposes a specific structural design for the bottom load-bearing frame 4, which includes a U-shaped base plate 24, two end plates 25 arranged at the front and rear, and side plates 26. The end plates 25 are connected to the front and rear beams of the base plate 24 by mortise and tenon joints. The end plates 25 include an integrally formed arc-shaped connecting part 251 and a side plate connecting part 252. The arc-shaped connecting part 251 is semi-circular, and its arc side faces the inside of the sofa seat. The lower end of the side plate 26 is connected to the side edge of the base plate 24 by mortise and tenon joints, and its front and rear ends are respectively connected to the side plate connecting parts 252 of the front and rear end plates 25 by mortise and tenon joints. In addition, the arc-shaped connecting part 251 of the end plate 25 is provided with a plurality of mortise eyes 27 on its arc-shaped edge, and a strip-shaped through groove 28 is provided on its straight edge; the lower crossbeam of the lower handrail frame 2 includes a plug-in crossbeam 29 and a through crossbeam 30; the two ends of the plug-in crossbeam 29 are provided with tenons 23, which are plugged into the mortise eyes 27; the through crossbeam 30 passes through the strip-shaped through groove 28; it also includes an intermediate vertical plate 31, which is supported on the intermediate beam of the base plate 24 by a mortise and tenon structure, and a strip-shaped through groove 28 is provided on its vertical edge; the middle part of the plug-in crossbeam 29 is supported on the intermediate vertical plate 31, and the through crossbeam 30 passes through the strip-shaped through groove 28 on the intermediate vertical plate 31.

[0055] Specifically, end plate 25 is a key component used to connect base plate 24 and handrail frame 1, and must meet load-bearing requirements. The arc-shaped connecting part 251 is designed to adapt to the geometric characteristics of the double cylindrical shape. The tenon eye 27 on its arc edge can be precisely inserted into the tenon 23 of the interlocking beam 29, thereby achieving vertical locking. The strip groove 28 provides a through channel for the beam 30 to pass through. Its linear design adapts to the transition requirements of the straight part of the handrail frame 1 and forms a lateral constraint force, effectively resisting lateral leaning force. The middle upright plate 31 is a support component fixed to the middle beam of base plate 24 by mortise and tenon structure. It can be made of wood or composite materials. The strip groove 28 on its vertical edge is aligned with the groove of end plate 25, so that the beam 30 can pass through all components at the same time, thereby improving the overall torsional rigidity.

[0056] In detail, the above structure achieves a high-strength connection between the handrail frame 1 and the bottom load-bearing frame 4 through the coordinated design of the end plate 25, the plug-in crossbeam 29, the through crossbeam 30, and the intermediate vertical plate 31. The arc-shaped connecting part 251 and the hawk-eye 27 layout of the end plate 25 ensure that the connection point is adapted to the curved surface height of the handrail frame 1, avoiding the gaps or stress concentration problems caused by traditional screw fixing. The through-slot 28 and the through crossbeam 30 form a lateral constraint force, effectively preventing the connection from loosening due to repeated stress. The separate structure of the plug-in crossbeam 29 and the through crossbeam 30 respectively achieves fixation in the vertical and horizontal directions. This dual-dimensional fixing mechanism originates from the contour characteristics of the double-arc handrail, which not only meets the requirements of smooth shape, but also avoids the strength limitations of a single connection method. The central upright plate 31 is mounted on the central beam of the base plate 24 via a mortise and tenon structure. Its supporting function disperses the concentrated load transmitted by the seat cushion, avoiding the risk of seat cushion collapse caused by the sagging of the lower crossbeam, thus ensuring a smooth transition support from the sofa body to the armrests. Overall, the above design deeply integrates the mortise and tenon structure into the double arc shape, fundamentally eliminating the defects of traditional glued or screw connections, achieving a high-strength, non-loosening permanent connection, and solving the core problem of unstable connection between the armrest frame 1 and the bottom load-bearing frame 4.

[0057] In summary, the connection structure between the double-arc armrest and the main frame 5 of the sofa provided in this application, through the embedded space 100 design, completely accommodates the bottom load-bearing frame 4 within the main frame 5 of the sofa. The arc-shaped notch 101 precisely adapts to the double cylindrical shape, effectively eliminating visual gaps and improving connection strength. At the same time, the synergistic effect of the connecting support component 6 and the transition beam component ensures that the support force in the seat area is evenly distributed, avoiding local collapse. It solves the technical problems of visual gaps, insufficient connection strength, and poor support in the transition area of ​​the seat cushion at the connection between the double-arc armrest and the main frame 5, achieving the advantages of seamless connection, stable connection, and smooth transition.

[0058] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0059] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A structure for the stable integration of double-round armrests with the main frame of a functional sofa, characterized in that, include: - Handrail frame (1), including lower handrail frame (2) and upper handrail frame (3) disposed thereon, the upper handrail frame (3) and the lower handrail frame (2) together define the outer contour of the stacked double cylinders, and the bottom of the lower handrail frame (2) is provided with a bottom load-bearing frame (4). -The main frame of the sofa (5) forms a seating area and a backrest area; - and connecting support assembly (6), the connecting support assembly (6) including a front connecting plate (7) and a rear connecting end plate assembly (8) connecting the main frame of the sofa (5) and the armrest frame (1); - The front connecting plate (7) and the rear connecting end plate group (8) are respectively connected to the front and rear sides of the main frame of the sofa (5), and the two are arranged opposite to each other to form an embedded space (100). The bottom load-bearing frame (4) of the armrest frame (1) is set in the embedded space (100). - Both the front connecting plate (7) and the rear connecting end plate assembly (8) are provided with arc-shaped notches (101) to adapt to the double cylindrical shape of the armrest frame (1).

2. The stable fit structure between the double-circle armrests and the main frame of the functional sofa according to claim 1, characterized in that, The bottom load-bearing frame (4) is provided with a tenon block (9). When the bottom load-bearing frame (4) is placed in the embedded space (100), the tenon block (9) is inserted into the tenon groove (10) on the side of the sofa main frame (5) to achieve a fixed connection.

3. The stable fit structure between the double-circle armrests and the main frame of the functional sofa according to claim 1, characterized in that, It also includes a transition beam assembly, which is disposed between the front connecting plate (7) and the rear connecting end plate group (8). It includes multiple transition beams arranged in an arc-shaped support surface, which is used to support the seat core (13) to achieve a smooth transition and support from the main frame of the sofa (5) to the armrest frame (1).

4. The stable fit structure between the double-circle armrests and the main frame of the functional sofa according to claim 3, characterized in that, The transition beam assembly includes a first mounting plate (14) and a second mounting plate (15); multiple first transition beams (16) are arranged between the front connecting plate (7) and the first mounting plate (14) to form a first arc-shaped support surface; multiple second transition beams (17) are arranged between the second mounting plate (15) and the rear connecting end plate assembly (8) to form a second arc-shaped support surface.

5. The stable fit structure between the double-circle armrests and the main frame of the functional sofa according to claim 1, characterized in that, The front connecting plate (7) is connected to the front side of the seating area of ​​the main frame (5) of the sofa, and its side facing the armrest has an arc-shaped notch (101) that matches the double cylindrical shape of the lower armrest frame (2).

6. The stable fit structure between the double-round armrests and the main frame of the functional sofa according to claim 1, characterized in that, The rear connecting end plate assembly (8) is connected to the side of the backrest area of ​​the main frame (5) of the sofa, and has an arc-shaped notch (101) that matches the double cylindrical shape of the upper armrest frame (3) and / or the lower armrest frame (2).

7. The stable fit structure between the double-round armrests and the main frame of the functional sofa according to claim 6, characterized in that, The rear connecting end plate assembly (8) includes a first rear connecting end plate (18) and a second rear connecting end plate (19); the first rear connecting end plate (18) is disposed on the rear edge of the side wall of the armrest frame (1), and has upper and lower arc-shaped notches that are respectively adapted to the upper rear plate assembly (20) of the upper armrest frame (3) and the lower rear plate assembly (21) of the lower armrest frame (2); the second rear connecting end plate (19) is disposed on the front side of the first rear connecting end plate (18), and has an upper arc-shaped notch adapted to the upper armrest frame (3).

8. The stable fit structure between the double-circle armrests and the main frame of the functional sofa according to claim 7, characterized in that, The first rear connecting end plate (18) and the second rear connecting end plate (19) are connected by multiple connecting plates (22), and the connecting plates (22) are fixed by tenons (23) inserted into the tenon grooves (10) provided on the first and second rear connecting end plates (18, 19).

9. The stable fit structure between the double-circle armrests and the main frame of the functional sofa according to claim 1, characterized in that, The bottom load-bearing frame (4) includes: - A sun-shaped baseboard (24); - Two end plates (25) are set at the front and back, and are connected to the front and rear beams of the base plate (24) by mortise and tenon structure. The end plate (25) includes an integrally formed arc-shaped connecting part (251) and a side plate connecting part (252). The arc-shaped connecting part is semi-circular and its arc side faces the inside of the sofa seat. - Side plate (26), the lower end of which is connected to the side edge of the base plate (24) by a mortise and tenon structure, and the front and rear ends of which are connected to the side plate connection parts of the front and rear end plates (25) by a mortise and tenon structure respectively.

10. The stable fit structure between the double-circle armrests and the main frame of the functional sofa according to claim 9, characterized in that, The arc-shaped connecting part of the end plate (25) has multiple mortise holes (27) on its arc-shaped edge and a strip through groove (28) on its straight edge; the lower crossbeam of the lower handrail frame (2) includes an insert crossbeam (29) and a through crossbeam (30); the two ends of the insert crossbeam (29) are provided with tenons (23), and the tenons (23) are inserted into the mortise holes (27); the through crossbeam (30) passes through the strip through groove (28); it also includes an intermediate upright plate (31), which is mounted on the intermediate beam of the base plate (24) by mortise and tenon structure, and a strip through groove (28) is provided on its vertical edge; the middle part of the insert crossbeam (29) is supported on the intermediate upright plate (31), and the through crossbeam (30) passes through the strip through groove (28) on the intermediate upright plate (31).

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