An embedded sofa

Abstract

The utility model belongs to furniture technical field especially relates to sofa of inside -recessed telescopic table board and linkage mechanism, concretely relates to a built -in sofa. The utility model includes riding unit, extension unit, and riding unit includes cushion, handrail, backrest, extension unit includes first extension board, is equipped with first cavity in first extension board, and first cavity has first opening, the inboard of cushion is equipped with sliding slot, and the lifting groove that communicates with sliding slot, lifting groove sets up between sliding slot and second opening, lifting groove is inclined from sliding slot one side upwards, first extension board is installed in second cavity, and first extension board side end is equipped with connecting rod, and the slider that is installed in sliding slot and lifting groove is equipped on connecting rod. The utility model provides the additional desktop space that can unfold for user through setting hidden telescopic table board in the inside of cushion.

Description

Technical Field

[0001] This utility model belongs to the field of furniture technology, and in particular relates to a sofa with a retractable tabletop and linkage mechanism hidden in the seat cushion, specifically an embedded sofa. Background Technology

[0002] Built-in sofas refer to a type of sofa that is integrated into or attached to a specific spatial structure in its design, making efficient use of corner areas, irregular spaces, or specially planned structures in a room.

[0003] However, the built-in design of sofas prevents them from being moved freely. For example, Chinese utility model patent CN211748272U discloses a built-in memory control sofa, which has the problem of being inconvenient to move and difficult to access items on the coffee table in front of it. This application solves the above problems by setting a liftable built-in wine rack in the armrest to store red wine (or other items that can be stored).

[0004] However, sofa armrests have limited storage space and often cannot meet the needs of passengers for more advanced items, such as food or laptops. Utility Model Content

[0005] The purpose of this invention is to provide an embedded sofa that provides users with additional desktop space by setting a hidden telescopic table inside the seat cushion.

[0006] The technical solution adopted by this utility model to solve the above problems is: an embedded sofa, comprising: a seating unit and an extension unit, wherein:

[0007] The seating unit includes a seat cushion, armrests on both sides of the seat cushion, and a backrest on the back of the seat cushion; the extension unit is disposed in a second cavity inside the seat cushion, the cavity inside the seat cushion having a second opening, and the second opening facing the opposite direction to the backrest.

[0008] The extension unit includes a first extension plate, a first cavity is provided in the first extension plate, the first cavity has a first opening, and the first opening faces the opposite direction to the position of the backrest.

[0009] The inner side of the seat cushion is provided with a sliding groove and a lifting groove that communicates with the sliding groove. The lifting groove is located between the sliding groove and the second opening, and the lifting groove is inclined upward from one side of the sliding groove.

[0010] The first extension plate is installed in the second cavity. A connecting rod is provided on the side end of the first extension plate, and a slider is provided on the connecting rod in the sliding groove and the lifting groove.

[0011] A further preferred technical solution is that the extension unit also includes a second extension plate installed in the first cavity.

[0012] A further preferred technical solution is that a sealing plate is also provided at the outer end of the second extension plate.

[0013] A further preferred technical solution is that the sealing plate is also equipped with a handle.

[0014] A further preferred technical solution is that two sets of connecting rods are arranged on the same side of the second extension plate, one in front and one behind.

[0015] A further preferred technical solution is that the backrest and armrests have a vertical plane on the side facing the wall.

[0016] A further preferred technical solution is that the connecting rod is also provided with a U-shaped frame for supporting the bottom end of the first extension plate.

[0017] A further preferred technical solution includes: an anti-collision component disposed in the second cavity, the anti-collision component comprising a block unit, a vertical buffer unit, and a horizontal buffer unit, wherein:

[0018] The block unit includes a block, a horizontal through hole and a vertical slot provided in the block, and the vertical slot is connected to the horizontal through hole;

[0019] The vertical buffer unit includes a sliding block installed in a vertical groove and a vertical buffer rod set at the top of the sliding block;

[0020] The transverse buffer unit includes a transverse buffer rod installed in a transverse perforation, and a V-groove provided in the transverse buffer rod;

[0021] A sliding rod is provided on the side end of the sliding block, and the sliding rod is installed in the V-groove.

[0022] A further preferred technical solution is that the vertical buffer rod includes a movable sleeve rod, a fixed rod, and a buffer spring; wherein the movable sleeve rod is sleeved on the fixed rod, and the buffer spring is sleeved on both the movable sleeve rod and the fixed rod.

[0023] A further preferred technical solution is that: a vertical impact block is provided at the top of the movable sleeve rod, and a buffer spring is pressed between the vertical impact block and the sliding block.

[0024] In summary, this utility model has the following advantages:

[0025] 1. This utility model provides users with additional desktop space by incorporating a hidden, retractable tabletop inside the seat cushion. This effectively solves the problems of traditional built-in sofas, which make it difficult to access items on the coffee table in front of the user due to their immobility, and the limited storage space in the armrests, which cannot meet the needs of placing larger items.

[0026] 2. This utility model is equipped with a sliding groove and a lifting groove, so that after the first extension plate is completely pulled out of the seat cushion, the slider on its connecting rod will automatically enter the upwardly inclined lifting groove, thereby driving the table to rise to the preset optimal usage height, improving the convenience of use and ergonomic comfort.

[0027] 3. The extension unit of this utility model is completely housed in the second cavity inside the seat cushion, and the opening is covered by a sealing plate. When not in use, it keeps the appearance of the sofa clean and intact, without taking up extra space. Attached Figure Description

[0028] The invention will be further described below with reference to the accompanying drawings:

[0029] Figure 1 This is a schematic diagram of the embedded sofa of this utility model;

[0030] Figure 2 This is a schematic diagram of the unfolded embedded sofa of this utility model;

[0031] Figure 3 This is a schematic diagram of the internal structure of the second cavity of the embedded sofa of this utility model;

[0032] Figure 4 This is an exploded schematic diagram of the anti-collision component of this utility model;

[0033] Figure 5 This is a schematic diagram of the anti-collision component of this utility model;

[0034] Figure 6 This is a cross-sectional structural diagram of the anti-collision component of this utility model;

[0035] Figure 7 A schematic diagram showing the positions of the horizontal perforation and vertical groove in this utility model;

[0036] Figure 8 This is a schematic diagram of the vertical buffer rod of this utility model;

[0037] The components represented by the numbers in the attached diagram are as follows: seat cushion 1, backrest 2, armrest 3, U-shaped frame 4, connecting rod 5, first extension plate 6, sliding groove 8, vertical buffer rod 9, movable sleeve rod 9.1, fixed rod 9.2, buffer spring 9.3, vertical impact block 9.4, second extension plate 10, block 11, transverse buffer rod 12, sliding rod 13, extension rod 14, lifting groove 15, sealing plate 16, transverse perforation 17, vertical groove 18, buffer rod groove 18.1, sliding block groove 18.2, sliding block 19, V-groove 20, transverse impact block 21, mounting rod 22, handle 23. Detailed Implementation

[0038] Example 1

[0039] To address the problems raised in the background art, this embodiment discloses an embedded sofa, including a seating unit and an extension unit, wherein:

[0040] The seating unit includes a seat cushion 1, armrests 3 on both sides of the seat cushion 1, and a backrest 2 on the back of the seat cushion 1; the extension unit is disposed in a second cavity inside the seat cushion 1, the cavity inside the seat cushion 1 has a second opening, and the second opening faces the opposite direction to the backrest 2.

[0041] The extension unit includes a first extension plate 6, the first extension plate 6 has a first cavity, the first cavity has a first opening, and the first opening faces the opposite direction to the position of the backrest 2.

[0042] The inner side of the seat cushion 1 is provided with a sliding groove 8 and a lifting groove 15 communicating with the sliding groove 8. The lifting groove 15 is located between the sliding groove 8 and the second opening, and the lifting groove 15 is inclined upward from one side of the sliding groove 8.

[0043] The first extension plate 6 is installed in the second cavity. The side end of the first extension plate 6 is provided with a connecting rod 5, and the connecting rod 5 is provided with a slider installed in the sliding groove 8 and the lifting groove 15.

[0044] The seat cushion 1 provides seating support and also serves as storage space for the extension unit. The dimensions of the seat cushion 1 can be adjusted to suit various needs, such as accommodating two or three people. The height of the seat cushion 1 can also be adjusted, but it must at least be able to accommodate all components of the extension unit. The seat cushion 1 has a second cavity inside, with its opening facing forward, opposite to the direction of the backrest, to facilitate the extension and retraction of the extension unit.

[0045] The first extension plate 6 is the core expansion component, extending outward from the second cavity to form an additional tabletop for placing larger items, such as laptops, tablets, plated food, etc. When stored, the first extension plate 6 retracts into the second cavity to achieve the effect of being hidden inside the seat cushion 1.

[0046] The connecting rod 5 is fixed to the side end of the first extension plate 6, and the slider is mounted on the connecting rod 5. It slides along the track formed by the sliding groove 8 and the lifting groove 15, controlling the movement path of the first extension plate 6. The sliding groove 8 provides a horizontal slide rail; when the slider moves horizontally along the sliding groove 8, the first extension plate 6 is smoothly pulled out. The lifting groove 15 is the key structure for adjusting the height of the first extension plate 6. The lifting groove 15 tilts upwards from the end of the sliding groove 8. The slider enters the lifting groove and lifts upwards, thereby driving the first extension plate 6 to rise along the inclined track, allowing the first extension plate 6 to reach a suitable height for use.

[0047] In summary, the first extension panel 6 provides a complete tabletop when unfolded, solving the problem of insufficient storage space in the armrest of CN211748272U. At the same time, the tilting and lifting structure automatically matches the optimal usage height. In addition, the hidden design of the seat cushion cavity ensures that the first extension panel 6 does not occupy extra space when not in use.

[0048] Furthermore, users desire that the first extension panel 6 have an adjustable length to increase usable space. Based on this, the extension unit also includes a second extension panel 10 installed within the first cavity. Based on the user's need for an adjustable length for the first extension panel 6, the newly added second extension panel 10 solves the space expansion problem through a nested telescopic design. As a telescopic extension component of the first extension panel 6, it extends the overall tabletop length through a pull-out operation. For example, if the width of the first extension panel 6 along the pull-out direction is 60cm, and the width of the second extension panel 10 along the pull-out direction is 30cm, with a 10cm gap at the connection point, then the second extension panel 10 can effectively extend 20cm further than the first extension panel 6, creating an 80cm wide usable space together, meeting the need to place larger items.

[0049] Furthermore, users prefer that the first and second cavities not be exposed, both for aesthetic reasons and to prevent dust and debris from entering and affecting the internal components. Based on this, a sealing plate 16 is also provided at the outer end of the second extension plate 10. When the second extension plate 10 is fully retracted, the sealing plate 16 covers the first opening of the first extension plate 6; when the first extension plate 6 is retracted into the seat cushion, the sealing plate 16 covers the second opening of the seat cushion, achieving a tiered sealing effect. The sealing plate 16 physically isolates dust and debris from entering the cavities, protecting the internal mechanical components. The sealing plate 16 can be made of fabric or wood grain veneer in the same color as the sofa cushion / armrest. The sealing plate 16 can also be seamlessly embedded into the edge of the opening, flush with the sofa surface when retracted, achieving a visually invisible effect.

[0050] Furthermore, users desire easy access to both the first extension plate 6 and the second extension plate 10. Therefore, a handle 23 is also provided on the sealing plate 16. The handle 23 allows the user to simultaneously pull out the first extension plate 6 and extend the second extension plate 10 with a single action. The handle 23 can be used as follows: Figure 2 The handle groove disclosed herein can also be any form capable of achieving the above-mentioned behavior, and no further restrictions are imposed on it in this embodiment.

[0051] Furthermore, the user wishes to prevent rotation at the connection point between the connecting rod 5 and the first extension plate 6. Based on this, two sets of connecting rods 5 are arranged front and rear on the same side of the second extension plate 10. The purpose of arranging two sets of connecting rods 5 is to construct a spatial stability system, fundamentally solving the problem of extension plate swaying caused by a single-point connection.

[0052] Furthermore, to facilitate the installation of the built-in sofa, the backrest 2 and armrest 3 have vertical planes facing the wall. The vertical planes of the backrest 2 and armrest 3 facing the wall are structurally adapted to solve the problem of non-close mounting to the wall, thus avoiding the triangular gaps formed between the traditional curved / sloping backrest and the wall, which would ruin the built-in visual effect.

[0053] Furthermore, the user desires higher load-bearing capacity for the first extension plate 6 and the second extension plate 10. Based on this, the connecting rod 5 is also equipped with a U-shaped bracket 4 to support the bottom end of the first extension plate 6. (Reference) Figure 3 The U-shaped frame 4 has an upward opening to wrap around the bottom edge of the first extension plate 6, forming a semi-enclosed load-bearing structure without affecting the sliding behavior of the first extension plate 6.

[0054] In summary, the specific usage methods for built-in sofas are as follows:

[0055] In its initial state, the extension unit is completely retracted into the second cavity of the seat cushion 1, and the sealing plate 16 covers the second opening of the seat cushion, remaining flush with the sofa surface to prevent dust from entering the cavity. At this time, the sofa can be used as a regular sofa, and passengers can sit normally. That is, no additional table is needed for daily sitting or leisure.

[0056] When an additional work surface is needed, the extension unit is deployed. First, pull the handle 23. The user grasps the handle 23 on the sealing plate 16 and pulls it outward, horizontally extending the first extension plate 6. When the handle is pulled, the slider on the connecting rod 5 moves horizontally along the sliding groove 8 on the inner side of the seat cushion 1, causing the first extension plate 6 to be smoothly pulled out of the second cavity of the seat cushion. The first extension plate 6 extends partially out of the seat cushion, but is still in a low position and its height has not been raised. When the slider moves to the end of the sliding groove 8, it automatically enters the lifting groove 15. The lifting groove 15 is tilted upward, and the slider moves upward along the tilted track, thereby lifting the first extension plate 6 upward. This allows the first extension plate 6 to reach a preset optimal usage height, such as a desktop height suitable for placing a computer or food, forming a stable work surface. The two sets of designs of the connecting rod 5 and the U-shaped frame 4 provide support to ensure load-bearing capacity.

[0057] If the user needs a larger surface area, such as for placing large items, they can further pull the unfolded first extension panel 6. A second extension panel 10 is nested within the first cavity inside the first extension panel 6. The user extends the second extension panel 10 from the first cavity by pulling it out. For example, if the first extension panel is 60cm wide, the second extension panel can extend an additional 20cm, bringing the total width to 80cm. The pulling out of the second extension panel 10 is synchronized with the first extension panel 6, making operation simple.

[0058] After the extension unit unfolds, the first extension plate 6 and the second extension plate 10 combine to form a continuous tabletop, suitable for placing items such as laptops, tablets, plated food, and books. The lifting height is automatically adjusted to match ergonomic needs, solving the problem of insufficient storage space in traditional built-in sofa armrests.

[0059] In addition, even without placing any items on it, users can use the first extension plate 6 and the second extension plate 10 to support their legs and sit on the sofa in a semi-reclining position, improving comfort.

[0060] Example 2

[0061] Furthermore, the second cavity is also equipped with anti-collision components to prevent the first extension plate 6 from impacting the inside of the seat cushion 1 when it is retracted.

[0062] Based on this, this embodiment discloses a collision avoidance component, including a block unit, a vertical buffer unit, and a horizontal buffer unit, wherein:

[0063] The block unit includes a block 11, a transverse through hole 17 and a vertical groove 18 disposed within the block 11, the vertical groove 18 being connected to the transverse through hole 17;

[0064] The vertical buffer unit includes a sliding block 19 installed in the vertical groove 18 and a vertical buffer rod 9 disposed at the top of the sliding block 19;

[0065] The transverse buffer unit includes a transverse buffer rod 12 installed in the transverse perforation 17, and a V-groove 20 provided in the transverse buffer rod 12;

[0066] The sliding block 19 has a sliding rod 13 on its side, and the sliding rod 13 is installed in the V-groove 20.

[0067] The anti-collision component design of this disclosure aims to solve the problems of short buffer distance and single buffer point of traditional rubber pads. By introducing an interconnected mechanism, the impact force is dispersed to multiple directions, both horizontal and vertical, thereby avoiding the concentration of force on a single buffer point and reducing the risk of damage such as dents and cracks.

[0068] Block 11 serves as the basic frame, fixed to the parts of the furniture requiring cushioning, and is used to install and support other cushioning units. It acts as the "base" of the entire anti-collision assembly, ensuring overall stability and rigidity. The interconnected design of the horizontal perforations 17 and vertical slots 18 allows other components, such as sliding blocks and buffer rods, to move internally. When an impact occurs, these holes and slots act as "guides," directing the distribution and transmission of force. For example, the vertical slots 18 allow the sliding blocks 19 to slide up and down, while the horizontal perforations 17 allow the horizontal buffer rods 12 to move horizontally, thus dispersing impact energy in multiple directions and preventing localized overload. Unlike the short-distance cushioning of traditional rubber pads, the internal space of the block unit provides a longer cushioning path. When the component is impacted, the force can be transmitted in multiple directions through the interconnected structure of the perforations and slots, extending the cushioning stroke and enhancing the protection of the furniture.

[0069] When furniture is subjected to a vertical impact, the horizontal buffer bar 12 directly bears the pressure and transmits the force to the sliding block 19 through the V-groove 20. The sliding block 19 slides up and down within the vertical groove 18, creating a "piston-like" effect. Vertical cushioning is achieved through friction or built-in elastic components, such as the vertical buffer bar 9. The V-groove 20 has a downward-sloping shape in the middle. When a lateral impact occurs, the horizontal buffer bar 12 moves laterally, and the sliding bar 13 slides within the V-groove 20. Due to the shape of the V-groove 20, the movement of the sliding bar 13 pushes the sliding block 19 to move vertically, thereby converting some of the horizontal force into a vertical force and preventing the force from concentrating at a single point. For example, if the lateral impact is too large, the slope of the V-groove 20 guides the movement of the sliding bar, causing the sliding block 19 to move vertically, dispersing the impact energy.

[0070] Furthermore, the vertical buffer rod 9 includes a movable sleeve rod 9.1, a fixed rod 9.2, and a buffer spring 9.3; wherein the movable sleeve rod 9.1 is sleeved on the fixed rod 9.2, and the buffer spring 9.3 is sleeved on both the movable sleeve rod 9.1 and the fixed rod 9.2.

[0071] The fixed rod 9.2 is the static part of the vertical buffer rod and is typically mounted directly to the top of the sliding block 19. The sliding block 19 is located within the vertical groove 18. It serves as the sliding track for the movable sleeve 9.1, allowing the movable sleeve to move along its axial direction, typically vertically, ensuring a straight and controllable movement path. Upon impact, the fixed rod absorbs part of the initial impact force but remains stationary, thus maintaining the rigidity of the overall structure.

[0072] The movable sleeve 9.1 is fitted onto the fixed sleeve 9.2, similar to a sliding sleeve. When an external impact force is applied, the movable sleeve can slide up and down along the axis of the fixed sleeve. This sliding mechanism converts impact energy into mechanical motion, rather than rigid absorption, thereby reducing the instantaneous impact intensity. The length of the sliding stroke is significantly greater than the buffer distance of traditional rubber pads, providing more effective protection.

[0073] The buffer spring 9.3 is simultaneously fitted onto both the movable sleeve rod 9.1 and the fixed rod 9.2, forming a complete spring buffer system. When the movable sleeve rod slides, the spring is compressed, and its elastic properties allow it to absorb impact energy. The spring design, such as spring stiffness and material, can be customized to accommodate different impact forces. In the overall system, the spring deformation is linked to the V-groove 20. When a lateral impact force acts on the lateral buffer rod 12, the movement of the sliding block may simultaneously trigger vertical buffering through the sliding rod 13 and the V-groove, compressing the spring and achieving multi-directional force dispersion.

[0074] Furthermore, a vertical impact block 9.4 is provided at the top of the movable sleeve 9.1, and a buffer spring 9.3 abuts between the vertical impact block 9.4 and the sliding block 19.

[0075] The vertical impact block 9.4 is located at the top of the movable sleeve 9.1 and is the part that directly contacts external vertical impacts. The buffer spring 9.3 is positioned between the vertical impact block 9.4 and the sliding block 19. When an impact force is applied to the vertical impact block 9.4, it pushes the movable sleeve 9.1 towards the fixed rod 9.2, causing the buffer spring 9.3 to be compressed. The deformation of the spring absorbs and dissipates impact energy, providing an adjustable buffer distance.

[0076] Furthermore, the vertical groove 18 includes a buffer rod groove 18.1 for mounting the vertical buffer rod 9 and a sliding block groove 18.2 for mounting the sliding block 19.

[0077] The buffer rod groove 18.1 serves as a receiving cavity for the vertical buffer rod 9, ensuring that the vertical buffer rod can be stably embedded within it and guiding the vertical movement path of the vertical buffer rod. The sliding block groove 18.2 is specifically designed to accommodate the sliding block 19, and the groove wall provides guidance for the sliding direction of the sliding block 19 inside, as well as bearing part of the impact force.

[0078] Furthermore, the lateral buffer unit also includes an extension rod 14 disposed on the lateral buffer rod 12.

[0079] The extension rod 14 allows the impact force received by the transverse buffer rod 12 to extend to the transverse buffer point.

[0080] Furthermore, the lateral buffer unit also includes a lateral impact block 21 disposed on the lateral buffer rod 12.

[0081] The transverse impact block 21 is used to directly contact the object to be buffered, reducing direct damage to the transverse buffer rod 12.

[0082] Furthermore, the block unit also includes a mounting rod 22 disposed on the block 11.

[0083] Mounting rod 22 allows block 11 to be positioned to be buffered, thus achieving a buffering effect.

[0084] In summary, the specific usage method of a collision avoidance component is as follows:

[0085] Determine the installation locations of the anti-collision components based on the furniture structure and collision risk points. Block 11 serves as the basic frame, with mounting rods 22 for securing it. Use screws, adhesives, or clips to firmly attach block 11 to the furniture surface via the mounting rods 22. Ensure that the lateral perforations 17 of block 11 face the possible direction of impact.

[0086] Insert the sliding block 19 into the sliding block groove 18.2 of the vertical groove 18, and then install the vertical buffer rod 9 into the buffer rod groove 18.1 at the top of the sliding block 19. Ensure that the movable sleeve 9.1 of the vertical buffer rod 9 can slide freely, and that the fixed rod 9.2 is fixed to the furniture.

[0087] Insert the transverse buffer rod 12 into the transverse through hole 17, and align and install the sliding rod 13 of the sliding block 19 within the V-groove 20 of the transverse buffer rod 12. Ensure that the "sunken" shape of the V-groove 20 allows the sliding rod 13 to move freely.

[0088] Check the linkage: Gently push the transverse impact block 21. When the transverse buffer rod 12 moves laterally, the sliding rod 13 should slide within the V-groove 20, causing the sliding block 19 to move up and down within the vertical groove 18. Ensure that all components move smoothly without jamming.

[0089] When the anti-collision mechanism is triggered, force is applied to the lateral impact block 21, the lateral buffer rod 12 moves laterally under force, and the sliding rod 13 slides within the V-groove 20. Due to the "sunken" sloping design of the V-groove 20, the movement of the sliding rod 13 will push the sliding block 19 to move up and down once within the vertical groove 18. This movement can effectively disperse the impact force, and the movement is limited to prevent excessive impact force on the vertical buffer point.

[0090] After the vertical impact block 9.4 is subjected to force, it pushes the movable sleeve 9.1 to slide downward along the fixed rod 9.2. The buffer spring 9.3 is compressed, absorbing and dissipating the impact energy.

[0091] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of the invention. Furthermore, the terms "vertical," "horizontal," "front," and "rear," etc., mentioned in the embodiments of the present invention indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. These are merely for the convenience of describing the present invention 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 the present invention. It should be further noted that, unless otherwise explicitly specified and limited, terms such as "install," "connect," "join," and "fix" in the description should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

Claims

1. An embedded sofa, characterized in that, Includes a seating unit and an extension unit, wherein: The seating unit includes a seat cushion (1), armrests (3) on both sides of the seat cushion (1), and a backrest (2) on the back of the seat cushion (1); the extension unit is disposed in a second cavity inside the seat cushion (1), the cavity inside the seat cushion (1) has a second opening, and the second opening faces the opposite direction to the backrest (2). The extension unit includes a first extension plate (6), the first extension plate (6) has a first cavity, the first cavity has a first opening, and the first opening faces the opposite direction to the position of the backrest (2); The inner side of the cushion (1) is provided with a sliding groove (8) and a lifting groove (15) communicating with the sliding groove (8). The lifting groove (15) is located between the sliding groove (8) and the second opening. The lifting groove (15) is inclined upward from one side of the sliding groove (8). The first extension plate (6) is installed in the second cavity. The first extension plate (6) has a connecting rod (5) on its side end. The connecting rod (5) has a slider installed in the sliding groove (8) and the lifting groove (15).

2. An embedded sofa according to claim 1, characterized in that, The extension unit also includes a second extension plate (10) installed in the first cavity.

3. An embedded sofa according to claim 2, characterized in that, The second extension plate (10) is also provided with a sealing plate (16) at its outer end.

4. An embedded sofa according to claim 3, characterized in that, The sealing plate (16) is also provided with a handle (23).

5. An embedded sofa according to claim 2, characterized in that, Two sets of connecting rods (5) are arranged on the same side of the second extension plate (10), one in front and one behind.

6. An embedded sofa according to claim 1, characterized in that, The backrest (2) and armrest (3) have a vertical plane on the side facing the wall.

7. An embedded sofa according to claim 1, characterized in that, The connecting rod (5) is also provided with a U-shaped frame (4) for supporting the bottom end of the first extension plate (6).

8. An embedded sofa according to claim 1, characterized in that, It also includes a collision avoidance assembly disposed in the second cavity, the collision avoidance assembly comprising a block unit, a vertical buffer unit, and a horizontal buffer unit, wherein: The block unit includes a block (11), a transverse through hole (17) and a vertical groove (18) disposed in the block (11), the vertical groove (18) being connected to the transverse through hole (17); The vertical buffer unit includes a sliding block (19) installed in the vertical groove (18) and a vertical buffer rod (9) set at the top of the sliding block (19). The transverse buffer unit includes a transverse buffer rod (12) installed in the transverse perforation (17) and a V-groove (20) provided in the transverse buffer rod (12). The sliding block (19) has a sliding rod (13) on its side end, and the sliding rod (13) is installed in the V-groove (20).

9. An embedded sofa according to claim 8, characterized in that, The vertical buffer rod (9) includes a movable sleeve rod (9.1), a fixed rod (9.2), and a buffer spring (9.3); wherein the movable sleeve rod (9.1) is sleeved on the fixed rod (9.2), and the buffer spring (9.3) is sleeved on both the movable sleeve rod (9.1) and the fixed rod (9.2).

10. An embedded sofa according to claim 9, characterized in that, The top of the movable sleeve (9.1) is provided with a vertical impact block (9.4), and the buffer spring (9.3) abuts between the vertical impact block (9.4) and the sliding block (19).

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