Seat depth adjustment device and sofa

Abstract

This utility model discloses a seat depth adjustment device and a sofa. The seat depth adjustment device includes a seat cushion fixing component, a seat frame fixing component, a first connecting component, a second connecting component, a first limiting component, and a second limiting component. The first connecting component is hinged at both ends to the seat cushion fixing component and the seat frame fixing component, respectively. The second connecting component is also hinged at both ends to both, forming a deformable quadrilateral linkage mechanism. By pushing the seat cushion fixing component, the connecting component rotates around the hinge point, achieving forward and backward translation of the seat cushion, thereby adjusting the seat depth. The first and second limiting components are respectively located on the seat cushion fixing component and / or the seat frame fixing component, and respectively abut against the front and rear sides of the first and second connecting components, used to limit the swing angle of the linkage, determine the seat depth adjustment range, and ensure stability. This device has a simple structure and is easy to operate. Seat depth adjustment is achieved simply by the hinged linkage and the limiting component, overcoming the problems of complex structure and high cost of traditional adjustable sofas.

Description

Technical Field

[0001] This utility model relates to the field of furniture technology, and in particular to a seat cushion depth adjustment device and a sofa. Background Technology

[0002] Currently, most mainstream sofas on the market feature fixed seat cushion positions, making it impossible to adjust their fore-and-aft position according to user needs. This inherent design severely limits the actual usable seat depth, making it difficult to meet the personalized comfort needs of users with different heights, body types, and sitting postures. Although some designs exist that aim to achieve adjustable seat depth, these solutions generally suffer from complex structures and high manufacturing costs. For example, they often rely on mechanisms such as sliding rails, pneumatic rods, or electric push rods. Furthermore, their adjustment range is often limited, resulting in poor practicality and hindering widespread market adoption. Utility Model Content

[0003] The present invention provides a seat depth adjustment device and a sofa, which aims to solve the problems of complex and costly existing sofa seat depth adjustment structures.

[0004] In a first aspect, this utility model provides a seat cushion depth adjustment device, comprising: a seat cushion fixing member, a seat frame fixing member, a first connecting member, a second connecting member, a first limiting member, and a second limiting member. The two ends of the first connecting member are respectively hinged to the seat cushion fixing member and the seat frame fixing member, and the two ends of the second connecting member are respectively hinged to the seat cushion fixing member and the seat frame fixing member. The seat cushion fixing member, the seat frame fixing member, the first connecting member, and the second connecting member form a quadrilateral structure. The first limiting member and the second limiting member are disposed on the seat cushion fixing member and / or the seat frame fixing member. The first limiting member abuts against the front and rear sides of the first connecting member, and the second limiting member abuts against the front and rear sides of the second connecting member, respectively.

[0005] Furthermore, the first limiting member includes a first front limiting body and a first rear limiting body. The first front limiting body and the first rear limiting body are respectively disposed on the front side and the rear side of the first connecting member along the front-rear direction of the seat frame fixing member. The first front limiting body abuts against the front side of the first connecting member, and the first rear limiting body abuts against the rear side of the second connecting member.

[0006] Furthermore, both the first front limiting body and the first rear limiting body are first limiting posts protruding from the seat frame fixing member in the left-right direction. The front and rear sides of the first connecting member are recessed towards each other to form a first notch groove, and the side wall of the first limiting post abuts against the first notch groove.

[0007] Furthermore, the second limiting member includes a second front limiting body and a second rear limiting body. The second front limiting body and the second rear limiting body are respectively disposed on the front side and the rear side of the second connecting member along the front-rear direction of the seat frame fixing member. The second front limiting body abuts against the front side of the second connecting member, and the second rear limiting body abuts against the rear side of the second connecting member.

[0008] Furthermore, both the second front limiting body and the second rear limiting body are second limiting posts protruding from the seat frame fixing member in the left-right direction. The front and rear sides of the second connecting member are recessed towards each other to form a second notch. The sidewall of the second limiting post abuts against the second notch.

[0009] Furthermore, the seat cushion fixing component includes a support portion and a connecting portion. The support portion is arranged in a horizontal direction, and the connecting portion is arranged in a vertical direction. The connecting portion is bent and connected to the support portion, and one end of the first connecting member and the second connecting member are both hinged to the connecting portion.

[0010] Furthermore, the seat cushion depth adjustment device also includes an elastic element, which is located between the first connecting member and the second connecting member, and its two ends are respectively connected to the seat cushion fixing member and the seat frame fixing member.

[0011] Furthermore, the elastic element is a spring, and both the seat cushion fixing component and the seat frame fixing component are provided with hooks. The two ends of the spring are respectively connected to the hooks on the seat cushion fixing component and the hooks on the seat frame fixing component.

[0012] Furthermore, the support portion has seat mounting holes at both ends along its front-rear direction.

[0013] Furthermore, the seat frame fixing member has seat frame mounting holes at both ends along its front-rear direction.

[0014] Furthermore, both ends of the first connector and both ends of the second connector are respectively hinged to the seat cushion fixing member and the seat frame fixing member by riveting members.

[0015] Secondly, this utility model also provides a sofa, including a fixed position, a functional position, and a seat cushion depth adjustment device. The seat cushion depth adjustment device is the aforementioned seat cushion depth adjustment device, and the fixed position and the functional position are each respectively equipped with the seat cushion depth adjustment device.

[0016] This utility model provides a seat depth adjustment device and a sofa. The seat depth adjustment device constructs a quadrilateral linkage mechanism hinged together by a seat cushion fixing component, a seat frame fixing component, and first and second connecting components. This mechanism transforms seat depth adjustment into the deformation motion of the quadrilateral. When the user pushes the seat cushion, the first and second connecting components rotate around their hinge points with the seat frame fixing component, causing the seat cushion fixing component to move back and forth in an approximately horizontal direction, thus achieving stepless or stepped adjustment of the seat depth. This structure achieves the core motion function through only a few hinge points and linkages, eliminating the need for complex transmission components such as motors and slide rails, significantly simplifying the overall structure and reducing manufacturing costs. Simultaneously, the first and second limiting components respectively constrain the back-and-forth swing angles of the first and second connecting components, ensuring the stability of the seat cushion at both ends of the adjustment stroke, preventing excessive forward or backward movement, and limiting the effective adjustment range of the seat depth, thus balancing safety and reliability. This application, through a simple mechanical design combining the aforementioned quadrilateral linkage and limiting mechanism, achieves flexible adjustment of seat depth while effectively overcoming the shortcomings of traditional adjustable sofas, such as complex structure and high cost, providing users with a seat adjustment solution that is easy to operate, highly stable, and easy to manufacture. Attached Figure Description

[0017] 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.

[0018] Figure 1 A schematic diagram of the seat cushion depth adjustment device according to an embodiment of the present invention is shown; Figure 2 A schematic diagram showing the seat depth adjustment device in the open position according to an embodiment of the present invention is provided. Figure 3 This diagram illustrates the seat depth adjustment device in the closed position according to an embodiment of the present invention. Figure label: 1. Seat cushion fixing component; 11. Support part; 12. Connecting part; 13. Seat cushion mounting hole; 2. Seat frame fixing component; 21. Seat frame mounting hole; 3. First connecting component; 31. First notch groove; 4. Second connecting component; 41. Second notch groove; 5. First limiting component; 51. First front limiting body; 52. First rear limiting body; 6. Second limiting component; 61. Second front limiting body; 62. Second rear limiting body; 7. Elastic component; 8. Hook. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] The directional terms used in this invention, such as "up," "down," "front," "back," "left," "right," "inner," "outer," and "side," are merely for reference to the accompanying drawings. Therefore, the directional terms used are for explanation and understanding of this invention, and not for limiting it. Furthermore, in the accompanying drawings, structures that are similar or identical are indicated by the same reference numerals.

[0021] In sofa usage scenarios, users' personalized needs for seat depth are becoming increasingly prominent. However, most fixed-position sofas on the market currently have fixed seat cushion positions, making it impossible to adjust the seat depth. Although some sofa designs offer adjustable seat depth, they generally suffer from complex depth adjustment structures, which not only increases the cost of manufacturing and subsequent maintenance but also makes it difficult to achieve large-scale standardized production and causes inconvenience to users. These problems seriously affect the user experience and market promotion of sofas, and there is an urgent need for a sofa seat depth adjustment solution with a simplified structure and controllable cost to solve the above dilemmas.

[0022] Therefore, this utility model provides a seat depth adjustment device and a sofa, which achieves seat depth adjustment through quadrilateral structural deformation. It has fewer components, a simple structure, and low cost, and can meet users' personalized needs for seat depth of fixed-position sofas.

[0023] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0024] Please see Figures 1-3 This utility model embodiment illustrates a seat cushion depth adjustment device, comprising: a seat cushion fixing member 1, a seat frame fixing member 2, a first connecting member 3, a second connecting member 4, a first limiting member 5, and a second limiting member 6. The two ends of the first connecting member 3 are respectively hinged to the seat cushion fixing member 1 and the seat frame fixing member 2, and the two ends of the second connecting member 4 are respectively hinged to the seat cushion fixing member 1 and the seat frame fixing member 2. The seat cushion fixing member 1, the seat frame fixing member 2, the first connecting member 3, and the second connecting member 4 form a quadrilateral structure. The first limiting member 5 and the second limiting member 6 are disposed on the seat cushion fixing member 1 and / or the seat frame fixing member 2. The first limiting member 5 abuts against the front and rear sides of the first connecting member 3, and the second limiting member 6 abuts against the front and rear sides of the second connecting member 4, respectively.

[0025] Specifically, the seat cushion fixing component 1 is used to install and fix the sofa seat cushion. Its structure can be set as a flat plate, a frame, or a plate with mounting grooves, etc., according to actual needs, as long as it can stably support and fix the seat cushion. The seat frame fixing component 2 is used to connect to the sofa base frame, providing the installation base for the entire adjustment device. Its structure can also be flexibly selected, such as a long strip of metal plate, a rectangular frame, or a support component with reinforcing ribs, etc. The core function is to ensure the stable assembly of the device with the sofa base frame. The first connecting component 3 and the second connecting component 4 can be connecting rods. The two ends of the first connecting component 3 are respectively hinged to the seat cushion fixing component 1 and the seat frame fixing component 2. The hinge method can be a hinge connection, a pin connection, or a rotational connection with bolts and waist-shaped holes, etc., as long as the first connecting component 3 can rotate relative to the seat cushion fixing component 1 and the seat frame fixing component 2. The two ends of the second connecting member 4 are hinged to the seat cushion fixing member 1 and the seat frame fixing member 2, respectively. The hinge method is similar to that of the first connecting member 3, and can be a hinge, pin, or bolt. Through this hinged connection, the seat cushion fixing member 1, the seat frame fixing member 2, the first connecting member 3, and the second connecting member 4 together form a deformable quadrilateral structure. This quadrilateral structure can change shape under external force, thereby causing the seat cushion fixing member 1 to move back and forth relative to the seat frame fixing member 2. The first limiting member 5 is used to limit the rotation angle of the first connecting member 3. It can be set on the seat cushion fixing member 1, the seat frame fixing member 2, or both. The structure of the first limiting member 5 can be a protrusion, a baffle, a limiting pin, or a component with a slot, etc. It abuts against the front and rear sides of the first connecting member 3, respectively. When the first connecting member 3 rotates to a set front position, the first limiting member 5 abuts against the front side of the first connecting member 3 to prevent it from continuing to rotate forward. When the first connecting member 3 rotates to a set rear position... When in the side position, the first limiting member 5 abuts against the rear side of the first connecting member 3 to prevent it from continuing to rotate backward; the second limiting member 6 is used to limit the rotation angle of the second connecting member 4, and its installation position is the same as that of the first limiting member 5. It can be set with the seat cushion fixing member 1, the seat frame fixing member 2, or both. The structure can also be a protrusion, baffle, limiting pin, etc., and abut against the front and rear sides of the second connecting member 4 respectively to limit the maximum rotation range of the second connecting member 4 and avoid excessive deformation of the quadrilateral structure, which may cause damage to the device or failure of adjustment.Specifically, addressing the issues of complex and costly existing fixed-position seat depth adjustment structures on sofas, this invention proposes a simple quadrilateral structure formed by setting up a seat cushion fixing component 1 and a seat frame fixing component 2, and utilizing the hinge of the first connecting component 3 and the second connecting component 4. This eliminates the need for complex transmission mechanisms or control components; seat depth adjustment is achieved solely through the deformation of the quadrilateral structure. Simultaneously, the simple first limiting component 5 and the second limiting component 6 limit the adjustment range. The overall design features fewer components and a simpler structure, effectively simplifying the adjustment structure and reducing manufacturing costs. Furthermore, the structure of each component can be implemented through various lower-level embodiments, adapting to different production needs while ensuring stable adjustment functionality. Through the above design, the seat depth adjustment device of this embodiment can stably adjust the seat depth of a fixed-position sofa, meeting users' personalized seat depth needs. It also features a simple structure and easy-to-process and assemble components, helping to reduce production and maintenance costs. Moreover, it adapts to the installation needs of various sofa and chair types, enhancing the device's versatility and practicality.

[0026] Reference Figure 2 and Figure 3 In one embodiment, the first limiting member 5 includes a first front limiting body 51 and a first rear limiting body 52. ​​The first front limiting body 51 and the first rear limiting body 52 are respectively disposed on the front and rear sides of the first connecting member 3 along the front-rear direction of the seat frame fixing member 2. The first front limiting body 51 abuts against the front side of the first connecting member 3, and the first rear limiting body 52 abuts against the rear side of the second connecting member 4. Specifically, the first front limiting body 51 and the first rear limiting body 52 are distributed along the front-rear direction of the seat frame fixing member 2 and are respectively disposed on the front and rear sides of the first connecting member 3. The first front limiting body 51 is used to prevent the first connecting member 3 from rotating excessively towards the front end of the sofa. When the first connecting member 3 rotates forward to a set position due to the deformation of the quadrilateral structure, the first front limiting body 51 directly abuts against the front side of the first connecting member 3, restricting its continued rotation. The first rear limiter 52 is used to prevent the first connector 3 from rotating excessively towards the rear of the sofa. When the first connector 3 rotates to the set position, the first rear limiter 52 abuts against the rear side of the first connector 3, thus limiting its continued rotation. This split-type limiting structure allows for more precise control of the rotation range of the first connector 3, ensuring that the seat depth adjustment is always within the preset range.

[0027] In this embodiment, both the first front limiting body 51 and the first rear limiting body 52 are first limiting posts protruding from the seat frame fixing member 2 in the left-right direction. The front and rear sides of the first connecting member 3 are recessed towards each other to form first notches 31, and the sidewalls of the first limiting posts abut against the first notches 31. Specifically, both the first front limiting body 51 and the first rear limiting body 52 adopt a first limiting post structure protruding from the seat frame fixing member 2 in the left-right direction. This protruding forming method does not require additional complex components and can be directly integrated with the seat frame fixing member 2 or simply welded for fixation, resulting in a simple structure and strong stability. Meanwhile, a first notch 31 is formed on both the front and rear sides of the first connector 3, with the shape and size of the first notch 31 adapted to the side wall of the first limiting post. When the first connector 3 is rotated to the limiting position, the side wall of the first limiting post can be precisely inserted into the first notch 31 and abut against it. Compared with the flat abutment, this groove and post matching method can prevent the first connector 3 from shifting left and right in the limiting state, further improving the stability and reliability of the limiting, while also reducing wear during abutment and extending the service life of the device.

[0028] Reference Figure 2 and Figure 3 In one embodiment, the second limiting member 6 includes a second front limiting body 61 and a second rear limiting body 62. The second front limiting body 61 and the second rear limiting body 62 are respectively disposed on the front and rear sides of the second connecting member 4 along the front-rear direction of the seat frame fixing member 2. The second front limiting body 61 abuts against the front side of the second connecting member 4, and the second rear limiting body 62 abuts against the rear side of the second connecting member 4. Specifically, the second front limiting body 61 and the second rear limiting body 62 are arranged along the front-rear direction of the seat frame fixing member 2 and are respectively located on the front and rear sides of the second connecting member 4. When the second connecting member 4 rotates with the quadrilateral structure towards the front end of the sofa, the second front limiting body 61 abuts against the front side of the second connecting member 4 to prevent it from rotating excessively forward. When the second connecting member 4 rotates towards the rear end of the sofa, the second rear limiting body 62 abuts against the rear side of the second connecting member 4 to prevent it from rotating excessively backward. Through this limiting design corresponding to the front and rear directions, it can work together with the first limiting member 5 to limit the deformation range of the quadrilateral structure, ensure the stability of the seat cushion fixing member 1 when it moves the seat cushion back and forth, and avoid deviation in seat depth adjustment due to insufficient limiting of the second connecting member 4.

[0029] In this embodiment, both the second front limiting body 61 and the second rear limiting body 62 are second limiting posts protruding from the seat frame fixing member 2 in the left-right direction. The front and rear sides of the second connecting member 4 are recessed towards each other to form second notches 41, and the sidewalls of the second limiting posts abut against the second notches 41. Specifically, both the second front limiting body 61 and the second rear limiting body 62 are second limiting posts protruding from the seat frame fixing member 2 in the left-right direction. This structure can be processed synchronously with the seat frame fixing member 2 without adding additional complex assembly steps, which can reduce production difficulty and cost. At the same time, the front and rear sides of the second connecting member 4 are recessed towards each other to form second notches 41. The contour of the second notches 41 is adapted to the sidewalls of the second limiting posts. When the second connecting member 4 rotates to the limiting position, the sidewalls of the second limiting posts will abut against the inner walls of the second notches 41. This matching method can not only precisely limit the rotation angle of the second connector 4, but also prevent the second connector 4 from moving laterally in the limited state by the wrapping effect of the second notch 41 on the second limiting post, ensuring the structural stability of the entire adjustment device during use. At the same time, it can also reduce the frictional wear between the limiting component and the connector, and improve the durability of the device.

[0030] It should be noted that, in this embodiment, reference is made to... Figure 2 and Figure 3 When the first connecting piece 3 abuts against the first front limiting body 51 and the second connecting piece 4 abuts against the second front limiting body 61 (open position), the quadrilateral structure is in a forward-expanded state. At this time, the seat cushion fixing piece 1 will move forward with the structural deformation, causing the seat cushion installed on it to extend forward, increasing the seat depth (the distance from the front end of the sofa to the rear end of the seat cushion). When the first connecting piece 3 abuts against the first rear limiting body 52 and the second connecting piece 4 abuts against the second rear limiting body 62 (closed position), the quadrilateral structure is in a backward-folding state. The seat cushion fixing piece 1 moves backward with the structural deformation, causing the seat cushion to shrink backward, decreasing the seat depth. Since the first connecting piece 3 and the second connecting piece 4 can rotate flexibly within the range limited by the limiting bodies, the quadrilateral structure can deform between the open and closed positions. The seat cushion fixing piece 1 can then adjust its position in the front-back direction, thereby causing the seat cushion to change its position within the corresponding range, ultimately achieving the adjustable seat depth function.

[0031] In one embodiment, the cushion fixing member 1 includes a support portion 11 and a connecting portion 12. The support portion 11 is arranged horizontally, and the connecting portion 12 is arranged vertically. The connecting portion 12 is bent and connected to the support portion 11. One end of the first connecting member 3 and the second connecting member 4 are both hinged to the connecting portion 12. Specifically, in order to ensure that the cushion fixing member 1 can stably support the cushion and form a reliable hinge with the first connecting member 3 and the second connecting member 4, the cushion fixing member 1 is configured to include a support portion 11 and a connecting portion 12. The support portion 11 is arranged horizontally, and its main function is to contact the sofa cushion and provide stable load-bearing, ensuring that the cushion is not easily shifted or shaken during adjustment. The connecting portion 12 is arranged vertically and is used to hinge with the first connecting member 3 and the second connecting member 4, providing a clear connection position for both. The connecting part 12 and the supporting part 11 are connected by bending. This connection method does not require additional splicing parts and can be integrally processed. This not only simplifies the overall structure of the seat cushion fixing part 1, but also improves its structural strength. At the same time, one end of the first connecting part 3 and the second connecting part 4 are both hinged to the connecting part 12, which can ensure that the force is more even during the rotation of the two and avoid adjustment jamming due to improper connection position.

[0032] Reference Figure 1 In this embodiment, the seat depth adjustment device further includes an elastic element 7, which is located between the first connecting member 3 and the second connecting member 4. The two ends of the elastic element 7 are connected to the seat cushion fixing member 1 and the seat frame fixing member 2, respectively. Specifically, to improve the smoothness of the seat depth adjustment process and help the device maintain a stable state after adjustment, this embodiment adds an elastic element 7. The elastic element 7 is located in the middle between the first connecting member 3 and the second connecting member 4, with its two ends connected to the seat cushion fixing member 1 and the seat frame fixing member 2, respectively. When the user pushes the seat cushion, causing the seat cushion fixing member 1 to move and deform the quadrilateral structure, the elastic element 7 will stretch or compress accordingly, generating a reverse elastic force. On the one hand, this buffers the impact force during the adjustment process, making the adjustment action smoother; on the other hand, after the user stops adjusting, the elastic force can help fix the current shape of the quadrilateral structure, reducing accidental displacement of the seat cushion during use, further improving the stability of the device and the user experience.

[0033] In specific implementation, the elastic element 7 is a spring, and hooks 8 are provided on both the seat cushion fixing component 1 and the seat frame fixing component 2. The two ends of the spring are respectively connected to the hooks 8 on the seat cushion fixing component 1 and the seat frame fixing component 2. Specifically, the elastic element 7 is preferably a spring, and hooks 8 are provided on both the seat cushion fixing component 1 and the seat frame fixing component 2. As a common elastic component, the spring has the advantages of low cost, stable elasticity, and long service life, which can well meet the elasticity requirements of the device. The hooks 8 provide a convenient connection point for the spring. During assembly, it is only necessary to hook the two ends of the spring onto the hooks 8 on the seat cushion fixing component 1 and the seat frame fixing component 2 respectively, without complicated tightening operations. This not only simplifies the assembly process but also facilitates subsequent maintenance or replacement of the spring, reducing the maintenance difficulty and cost of the device.

[0034] In one embodiment, the support portion 11 has cushion mounting holes 13 at both ends along its front-rear direction. Specifically, to facilitate a quick and secure connection between the cushion fixing component 1 and the sofa cushion, this embodiment optimizes the support portion 11 by providing cushion mounting holes 13 at both ends along its front-rear direction. During actual assembly, fasteners such as bolts and screws can pass through these cushion mounting holes 13 to tightly fix the sofa cushion to the support portion 11. The design of mounting holes at both ends makes the fixing points of the cushion more balanced, avoiding tilting or loosening of the cushion during use or adjustment due to fixing at a single point or on one side. At the same time, the standardized mounting holes can also adapt to cushions of different specifications, improving the versatility of the cushion fixing component 1.

[0035] In one embodiment, the seat frame fixing member 2 has seat frame mounting holes 21 at both ends along its front-rear direction. Specifically, to achieve reliable assembly between the seat frame fixing member 2 and the sofa base frame and ensure the installation stability of the entire adjustment device on the sofa, this embodiment provides seat frame mounting holes 21 at both ends along its front-rear direction. During installation, bolts, rivets, and other connecting parts can be used to pass through the seat frame mounting holes 21 to securely connect the seat frame fixing member 2 to the sofa base frame; the mounting holes at both ends allow for a more reasonable distribution of stress points on the seat frame fixing member 2, avoiding excessive local stress due to concentrated installation points, thereby preventing deformation or loosening of the seat frame fixing member 2 during long-term use, ensuring the overall structural stability of the adjustment device, and also providing convenience for the disassembly and maintenance of the device.

[0036] In one embodiment, both ends of the first connecting member 3 and both ends of the second connecting member 4 are respectively hinged to the seat cushion fixing member 1 and the seat frame fixing member 2 via riveting members. Specifically, the riveting member is used as a hinge shaft, passing through the end of the connecting rod and the corresponding hinge hole on the fixing member before being riveted to form a rotatable hinge pair. Riveting connection has the characteristics of simple structure, high connection strength, and high assembly efficiency. The connecting member and the fixing member can be tightly connected by the riveting member, while ensuring that the connecting member can rotate flexibly around the riveting member to meet the deformation requirements of the quadrilateral structure. In addition, the riveting process is mature, does not require complex processing equipment, reduces production difficulty, and is not prone to loosening after riveting, which can improve the service life of the device and ensure the long-term stable and reliable seat depth adjustment function.

[0037] Reference Figures 1-3 This utility model embodiment also provides a sofa, including a fixed position, a functional position, and a seat depth adjustment device. The seat depth adjustment device is the same as described above, and the fixed position and the functional position are each equipped with the seat depth adjustment device. This seat depth adjustment device has been described in detail in the above embodiments, and for the sake of brevity, it will not be repeated here.

[0038] Specifically, the sofa in this embodiment includes a fixed position, a functional position, and a seat depth adjustment device. The seat depth adjustment device used is the same as that in the above embodiment, and the seat depth adjustment device is installed on both the fixed position and the functional position of the sofa. Fixed seating areas on a sofa have a relatively simple function and basic location, while functional seating areas offer additional features (such as angle adjustment and extension). By equipping both with the same seat depth adjustment device, the frame structure and cushion support methods of both areas can be kept consistent. This ensures uniformity in key dimensions affecting seating comfort, such as cushion support and elastic feedback. Furthermore, the unified seat depth adjustment device ensures the commonality of components (such as frame parts and adjustment mechanisms) between the fixed and functional areas, preventing differences in seating comfort caused by using different adjustment or support components in different areas. This effectively solves the problem of inconsistent seating comfort between fixed and functional areas in existing sofas, allowing users to enjoy a stable and consistent comfortable experience regardless of whether they use the fixed or functional area. The unified device structure also facilitates the overall production, assembly, and maintenance of the sofa, reducing production and maintenance costs.

[0039] 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 seat cushion depth adjustment device, characterized in that, include: The package includes a seat cushion fixing component, a seat frame fixing component, a first connecting component, a second connecting component, a first limiting component, and a second limiting component. The two ends of the first connecting component are hinged to the seat cushion fixing component and the seat frame fixing component, respectively. The two ends of the second connecting component are hinged to the seat cushion fixing component and the seat frame fixing component, respectively. The seat cushion fixing component, the seat frame fixing component, the first connecting component, and the second connecting component form a quadrilateral structure. The first limiting component and the second limiting component are disposed on the seat cushion fixing component and / or the seat frame fixing component. The first limiting component abuts against the front and rear sides of the first connecting component, respectively. The second limiting component abuts against the front and rear sides of the second connecting component, respectively.

2. The seat depth adjustment device according to claim 1, characterized in that, The first limiting member includes a first front limiting body and a first rear limiting body. The first front limiting body and the first rear limiting body are respectively disposed on the front side and the rear side of the first connecting member along the front-rear direction of the seat frame fixing member. The first front limiting body abuts against the front side of the first connecting member, and the first rear limiting body abuts against the rear side of the second connecting member.

3. The seat depth adjustment device according to claim 2, characterized in that, Both the first front limiting body and the first rear limiting body are first limiting posts protruding from the seat frame fixing member in the left-right direction. The front and rear sides of the first connecting member are recessed towards each other to form a first notch groove. The side wall of the first limiting post abuts against the first notch groove.

4. The seat depth adjustment device according to claim 1, characterized in that, The second limiting member includes a second front limiting body and a second rear limiting body. The second front limiting body and the second rear limiting body are respectively disposed on the front side and the rear side of the second connecting member along the front-rear direction of the seat frame fixing member. The second front limiting body abuts against the front side of the second connecting member, and the second rear limiting body abuts against the rear side of the second connecting member.

5. The seat depth adjustment device according to claim 4, characterized in that, The second front limiting body and the second rear limiting body are both second limiting posts protruding from the seat frame fixing member in the left and right direction. The front and rear sides of the second connecting member are recessed towards each other to form a second notch. The side wall of the second limiting post abuts against the second notch.

6. The seat depth adjustment device according to any one of claims 1-5, characterized in that, The seat cushion fixing component includes a support part and a connecting part. The support part is arranged in a horizontal direction, and the connecting part is arranged in a vertical direction. The connecting part is bent and connected to the support part. One end of the first connecting member and the second connecting member are both hinged to the connecting part.

7. The seat depth adjustment device according to claim 6, characterized in that, It also includes an elastic element, which is located between the first connector and the second connector, and its two ends are respectively connected to the seat cushion fixing member and the seat frame fixing member.

8. The seat depth adjustment device according to claim 7, characterized in that, The elastic element is a spring, and both the seat cushion fixing component and the seat frame fixing component are provided with hooks. The two ends of the spring are respectively connected to the hooks on the seat cushion fixing component and the hooks on the seat frame fixing component.

9. The seat depth adjustment device according to claim 6, characterized in that, The support part has seat mounting holes at both ends along its front-rear direction.

10. The seat depth adjustment device according to claim 1, characterized in that, The seat frame fixing member has seat frame mounting holes at both ends along its front and rear directions.

11. The seat cushion depth adjustment device according to claim 1, characterized in that, Both ends of the first connector and both ends of the second connector are respectively hinged to the seat cushion fixing member and the seat frame fixing member by riveting members.

12. A sofa, characterized in that, It includes a fixed position, a functional position, and a seat depth adjustment device, wherein the seat depth adjustment device is the seat depth adjustment device according to any one of claims 1-11, and the seat depth adjustment device is installed in both the fixed position and the functional position.

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