A type of seat

Abstract

This utility model discloses a seat, including a second connecting rod and a first connecting rod. The base of the second connecting rod is used to connect to the seat support base, and the first connecting rod is rotatably connected to the base and located behind it. The rear part of the seat is movably connected to the first connecting rod to form a first point, and the front part is movably connected to the second connecting rod to form a second point. When the first connecting rod rotates relative to the second connecting rod, the distance between the first and second points changes, causing the seat to tilt. This seat uses connecting rods instead of a traditional chassis to connect the seat to the support base, and the first connecting rod can be connected to the backrest to achieve seat-back linkage. This solution eliminates the chassis, which reduces production costs, improves the aesthetics of the seat, and retains the mobility of the seat, significantly enhancing the functionality and comfort of the chassis-less seat.

Description

Technical Field

[0001] This utility model relates to the field of furniture, and in particular to a chair. Background Technology

[0002] In the field of seating, the chassis is a functional module that is usually set separately under the seat. Its main functions are to realize the tilting of the backrest, the adjustment of the lifting gas spring, or the movement of the seat, and it has gradually become an indispensable part of modern seating.

[0003] However, the presence of the chassis affects the appearance of the chair to some extent. Its large size and thickness are very conspicuous when placed on the chair, and the visual feeling is very abrupt. This is especially true for light luxury office chairs that pay more attention to appearance. The abrupt chassis disrupts the minimalist style. Although it provides the basis for changing the position of the chair in terms of function, it fails to attract consumers in terms of appearance.

[0004] When the chassis is removed to save costs or improve aesthetics, the mobility that the chassis provides for the seat is also lost. For example, after removing the chassis, the seat cannot tilt or the backrest cannot be moved, which reduces the functionality and comfort of the seat and makes it difficult to meet the needs of most users. Therefore, there is a need for a seat that can still maintain mobility even if the chassis is removed. Summary of the Invention

[0005] To address the aforementioned technical problems, this utility model provides a seat, including a second connecting rod and a first connecting rod. The base of the second connecting rod is used to connect to the seat support base, and the first connecting rod is rotatably connected to the base and located behind it. The rear part of the seat is movably connected to the first connecting rod to form a first point, and the front part is movably connected to the second connecting rod to form a second point. When the first connecting rod rotates relative to the second connecting rod, the distance between the first and second points changes, causing the seat to tilt. This seat uses connecting rods instead of a traditional chassis to connect the seat to the support base, and the first connecting rod can be connected to the backrest to achieve seat-back linkage. This solution eliminates the chassis, reducing production costs, improving the aesthetics of the seat, and retaining the seat's mobility, significantly enhancing the functionality and comfort of the chassis-less seat.

[0006] The technical solution of this utility model is implemented as follows: A seat includes a second linkage, the second linkage including a base configured to be connected to a support base of the seat, a first linkage rotatably connected to the base, the first linkage being located behind the second linkage, a seat portion provided on the first linkage and the second linkage, the rear portion of the seat portion being movably connected to the first linkage with the connection point being a first point, and the front portion of the seat portion being movably connected to the second linkage with the connection point being a second point; the first linkage is configured such that when the first linkage rotates relative to the second linkage, the distance between the first point and the second point changes, thereby causing the seat portion to tilt.

[0007] In this design, the chassis is removed and replaced with connecting rods to connect the seat to the support base. Simultaneously, the seat is movably connected to the first and second connecting rods. The relative rotation of the first and second connecting rods drives the tilting motion of the seat. During this movement, the distance between the two connection points changes, and the seat adapts to these changes, maintaining its mobility. Generally, the first connecting rod also connects to the backrest; when the backrest is lowered, the seat tilts backward, achieving seat-backrest linkage. Therefore, this design eliminates the chassis, reducing costs and enhancing aesthetics, while retaining the seat's mobility, thus improving the functionality and comfort of the chassis-less seat. The support base typically includes a gas spring, which is usually plugged into the base, but a rotatable connection between the support base and the base is also possible.

[0008] Preferably, the first connecting rod is rotatably engaged with the seat, and the first point remains relatively fixed relative to both the first connecting rod and the seat; the second connecting rod is slidably engaged with the seat, and the second point remains relatively fixed relative to the second connecting rod. When the first connecting rod rotates relative to the second connecting rod, the seat slides and rotates relative to the second point. In this design, when the first connecting rod rotates backward relative to the second connecting rod, since the first point remains relatively fixed relative to both the first connecting rod and the seat, the first connecting rod will drive the rear part of the seat to move backward and downward. Furthermore, since the second point remains relatively fixed relative to the second connecting rod, the front part of the seat can maintain a certain height while tilting, thus creating a forward-high, backward-low posture for the seat to accommodate the human leg. Moreover, the movement of the seat coordinates with the movement of the backrest to achieve an anti-back-rubbing effect.

[0009] Preferably, the vertical length of the base is 50-70mm, the front-to-back dimension is 90-120mm, and the left-to-right dimension is 60-70mm. Traditional chassis are difficult to reduce in size due to their internal functional structure design. However, in this solution, the base size is much smaller than that of a traditional chassis. Although it connects and supports the base, it is not equivalent to a chassis. The smaller size of the base allows for a smooth connection of the second connecting rod below the base, resulting in a strong sense of unity and achieving the visual effect of having only the rod and no chassis. This makes the base volume only 30% of that of a typical chassis.

[0010] Preferably, the base is located below the seat, with the seat suspended above the base, creating a vertical gap between them. This suspended seat emphasizes its slimness and enhances its aesthetics. Because the seat is chassis-free, with no base installed beneath it, the overall thickness of the seat is thinner and more slender. Furthermore, the suspended design further highlights the difference between this seat and existing chairs.

[0011] Preferably, the first connecting rod includes a rotating part rotatably connected to the base, the rotating part having a first inclined rod extending obliquely rearward and upward; the second connecting rod also includes a second inclined rod extending obliquely forward and upward from the front end of the base, the seat being connected to the first inclined rod and the second inclined rod respectively. The obliqueness of the first and second inclined rods is used to raise the height of the seat, making it suspended above the base. Besides enhancing aesthetics, this suspended seat also serves to prevent interference between the seat and the first and second connecting rods.

[0012] Preferably, a first upwardly protruding mounting seat is provided on the first inclined rod portion, and a second upwardly protruding mounting seat is provided on the second inclined rod portion. The first mounting seat is connected to the rear portion of the seat portion, and the second mounting seat is connected to the front portion of the seat portion. A first point is formed on the first mounting seat, and a second point is formed directly or indirectly on the second mounting seat. The first and second mounting seats are used to further raise the height of the seat portion and prevent the seat portion and the inclined rod portion from interfering with each other.

[0013] Preferably, the base includes a bottom shell with a clearance groove arranged in the front-to-back direction; a connecting member is provided on the second mounting seat, the connecting member enters the bottom shell from the clearance groove, guide rails are formed on both sides of the bottom shell with the clearance groove, and rollers are provided on the connecting member. The rollers are located inside the bottom shell and abut against the guide rails, and a second point is formed on the rollers. The rollers enable sliding rotation connection, which can reduce wear and make the movement of the base and the second connecting rod smoother.

[0014] Preferably, a cover plate is provided inside the bottom shell, the cover plate is located above the clearance groove, the roller is located between the cover plate and the bottom shell and abuts against the cover plate, and a guide rail is formed between the bottom shell and the cover plate. The cover plate and the bottom shell are fixedly connected by screws, and the cover plate is located above the roller. When the seat is in use, the front part of the seat is mainly supported by the abutment between the cover plate and the roller.

[0015] Preferably, the rotating part is U-shaped, with its left and right ends extending forward to both sides of the base and rotatably connected to the base on both sides.

[0016] Preferably, both the first and second connecting rods are branched, with two first diagonal rods, each branching out and connected to the base. Similarly, both second diagonal rods are branching out and connected to the base. The branched first and second connecting rods have four connection points with the base, making the connection more stable and ensuring the base remains stable when supporting a person.

[0017] Preferably, the first link is provided with a backrest. The first link includes a rotating part that is rotatably connected to the base. The rotating part is provided with a first inclined rod that extends obliquely backward and upward. The first inclined rod is provided with a vertical rod for mounting the backrest.

[0018] Preferably, the backrest includes a sleeve portion with a slot, the sleeve portion being fitted onto the vertical rod portion, and the vertical rod portion being inserted into the slot.

[0019] The design starting point, concept, and beneficial effects of this utility model, which adopts the above technical solution, are as follows: In this design, the chassis is removed and replaced with connecting rods to connect the seat to the support base. Simultaneously, the seat is movably connected to the first and second connecting rods. The relative rotation of the first and second connecting rods drives the tilting motion of the seat. During this movement, the distance between the two connection points changes, and the seat adapts to these changes, maintaining its mobility. Generally, the first connecting rod also connects to the backrest; when the backrest is lowered, the seat tilts backward, achieving seat-backrest linkage. Therefore, this design eliminates the chassis, reducing costs and enhancing aesthetics, while retaining the seat's mobility, thus improving the functionality and comfort of the chassis-less seat. The support base typically includes a gas spring, which is usually plugged into the base, but a rotatable connection between the support base and the base is also possible. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the seat in the upright sitting state in the embodiment of the present invention; Figure 2 This is a side view of the seat in the upright sitting position in an embodiment of the present invention; Figure 3 This is a three-dimensional structural diagram of the seat in the reclining state in an embodiment of the present invention; Figure 4 This is a side view of the seat in the reclining state in an embodiment of the present invention; Figure 5 This is a three-dimensional structural diagram of the handrail frame in an embodiment of the present invention; Figure 6 This is a side view of the handrail frame in an embodiment of the present invention; Figure 7 This is a schematic diagram of the backrest and the first connecting rod assembly in an embodiment of the present invention; Figure 8 This is a schematic diagram of the three-dimensional structure of the present invention, in which the tilting elastic element is installed in the base plate in an embodiment. Figure 1 ; Figure 9 This is a schematic diagram of the three-dimensional structure of the present invention, in which the tilting elastic element is installed in the base plate in an embodiment. Figure 2 ; Figure 10 This is an exploded view of the first connecting rod and the second connecting rod in the embodiment of this utility model; Figure 11 This is a three-dimensional structural diagram of the second connecting rod in an embodiment of the present invention; Figure 12 This is an exploded view of the cover plate and bottom shell in an embodiment of the present invention; Figure 13 This is a three-dimensional structural diagram of the fixed connection between the cover plate and the bottom shell in an embodiment of the present invention; Figure 14 This is a three-dimensional structural diagram of the cover plate in an embodiment of the present invention; Figure 15 This is a three-dimensional structural diagram of the connecting seat of the first connecting rod and the second connecting rod, the backrest, and the supporting base in an embodiment of the present invention. Figure 16 This is a side view of the connecting seat, backrest, and support base of the first and second connecting rods in an embodiment of the present invention.

[0021] The attached figures are labeled as follows: 1. Armrest frame; 2. Arm support; 3. Movable link; 4. Second link; 5. First link; 6. Base; 7. Backrest; 8. Seat; 10. Lifting gas spring; 11. Five-star base; 12. Sleeve; 13. Main rod; 14. Split rod; 15. First mounting base; 16. Second mounting base; 17. Rotating part; 18. First inclined rod; 19. Vertical rod; 20. Second inclined rod; 21. Tilting elastic element; 22. Connector; 23. Bottom shell; 24. Clearance groove; 25. Guide rail; 26. Roller; 27. First point A; Second point B; Cover plate; 28. Detailed Implementation

[0022] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0024] In the description of this utility model, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] The specific embodiments of this utility model are as follows: like Figure 1-6 As shown, this utility model provides a seat, including an armrest frame 1. The armrest frame 1 includes an arm support member 2, a movable link member 3, a second link member 4, and a first link member 5, which are rotatably connected in sequence. The second link member 4 includes a base 6 located at its lower end, which is configured to be connected to the support base of the seat. The first link member 5 is rotatably connected to the base 6. The arm support member 2 is arranged in the front-back direction at the upper end of the armrest frame 1 and is configured to support the arm. The movable link member 3 and the first link member 5 are arranged at intervals in the front-back direction, with the first link member 5 located at the rear and the second link member 4 located at the lower end of the armrest frame 1. The first link member 5 is linked with the arm support member 2 and the movable link member 3. The first link member 5 is provided with a backrest 7, and the movable link member 3 and the second link member 4 are movably provided with a seat 8. When the backrest 7 is tilted back, it drives the first link member 5 to move and causes the armrest frame 1 to move, and the arm support member 2 and the seat 8 move accordingly.

[0026] In this design, the armrest frame 1 is divided into at least four parts, forming a four-bar linkage. The arm support 2 supports the arm, the movable link 3 provides a closed loop for the four-bar linkage, the second link 4 connects to the seat support base (such as the lifting gas spring 10) and remains stationary relative to the ground, and the first link 5 mounts the backrest 7 and acts as the active component in the four-bar linkage. The four links are sequentially hinged end-to-end to form the four-bar linkage. When the backrest 7 is pushed by the user leaning back, the first link 5 tilts backward along with the backrest 7. Simultaneously, the first link 5 pulls the arm support 2 backward, while the second link 4 remains stationary. The movable link 3 is pulled by the arm support 2. When in motion, the first link 5 rotates backward only on the second link 4; the second link 5 also rotates backward on the second link 4, but since the first link 5 and the second link 4 are not parallel, the arm support 2 between them does not move in parallel, but will tilt to a certain extent. The tilt of the arm support 2 is adjusted by the size ratio of the first link 5 and the second link 4, resulting in a downward rotation at the front end; the seat 8 located between the first link 5 and the second link 4 will also be driven by the first link 5 to move backward and tilt. Therefore, this solution not only eliminates the chassis and increases aesthetics, but also achieves seat-back linkage, improves user comfort, and makes the armrests move together, so that the armrests can conform to the ergonomic posture when sitting or resting.

[0027] To further highlight the difference between the base 6 and the traditional chassis, the vertical length of the base 6 is 50-70mm, the front-to-back dimension is 90-120mm, and the left-to-right dimension is 60-70mm. In this embodiment, the vertical length of the base 6 is 65mm, the front-to-back dimension is 98mm, and the left-to-right dimension is 65mm. The smaller size of the base allows for a smooth connection of the second connecting rod 4 below the seat, resulting in a strong sense of unity and achieving the visual effect of having only rods without a chassis.

[0028] Specifically, such as Figure 1-4 As shown, this solution is not limited to light luxury office chairs. The seat's support base includes a lifting gas spring 10 and a five-star base 11. The base 6 is connected to the lifting gas spring 10, which is equivalent to realizing the function of connecting the lifting gas spring 10 in the chassis. The first connecting rod 5 in the armrest frame 1 is used to install the backrest 7 and can rotate with the base 6, which is equivalent to realizing the function of connecting the backrest 7 and tilting the backrest 7 in the chassis. The seat 8 is connected to both the second connecting rod 4 and the first connecting rod 5 and can move with the backrest 7. The angle between the backrest 7 and the seat 8 changes, which is equivalent to realizing the seat-back linkage function in the chassis. In summary, although the chassis is eliminated, the core functions of the chassis are retained through the new structural design.

[0029] like Figure 1 , 3As shown in Figure 7, the first connecting rod 5 is located behind the second connecting rod 4. The lower end of the first connecting rod 5 is rotatably connected to the base 6, and the upper end of the first connecting rod 5 is rotatably connected to the rear end of the arm support 2. The front end of the arm support 2 is rotatably connected to the upper end of the movable connecting rod 3, and the lower end of the movable connecting rod 3 is rotatably connected to the upper end of the second connecting rod 4. Therefore, the armrest frame 1 is closed, and the backrest 7 is installed as follows: the backrest 7 includes a sleeve portion 12 with a slot 13. The sleeve 12 is mounted on the first connecting rod 5, which is inserted into the slot 13. Further, the first connecting rod 5 includes a main rod 14 and a split rod 15. The split rod 15 is inserted into the upper end of the main rod 14. The split rod 15 is configured so that when it is separated from the main rod 14, the sleeve part 12 can be fitted onto the upper end of the main rod 14. After the sleeve part 12 is fitted onto the main rod 14, the split rod 15 is then inserted and installed onto the main rod 14, thus completing the installation of the backrest 7 on the enclosed armrest frame 1.

[0030] Furthermore, such as Figure 1-4 As shown, the chair has an upright sitting position and a reclining position: In the upright sitting position, the backrest 7 is vertical, and the arm support 2 and seat 8 are horizontal or slightly tilted upwards; when switching from the upright sitting position to the reclining position, the backrest 7 tilts backwards, and both the arm support 2 and seat 8 move backwards. At the same time, the front end of the arm support 2 tilts downwards, and the rear end of the seat 8 tilts downwards. In both positions, the posture of the backrest 7, arm support 2, and seat 8 is more ergonomic. Especially in the reclining position, the backrest 7 tilts backwards, the arm support 2 tilts downwards from back to front, allowing the user's arms to rest naturally and comfortably on it, and the seat 8 tilts slightly downwards from front to back, which can increase the sitting comfort when reclining.

[0031] The seat 8 is suspended above the armrest frame 1, and there is a cantilevered space between the base 6 and the seat 8 in the vertical direction; for example Figure 10 , 11As shown, the first connecting rod 5 is provided with an upwardly protruding first mounting seat 16, and the second connecting rod 4 is provided with an upwardly protruding second mounting seat 17. The first mounting seat 16 is connected to the rear of the seat 8, and the second mounting seat 17 is connected to the front of the seat 8. The suspended seat 8 highlights its slimness and enhances its aesthetics. Since the seat is chassis-free, there is no chassis installed under the seat 8, so the overall thickness of the seat 8 is thinner and slimmer. Combined with the suspended design, it further highlights the difference from existing seats. Furthermore, the first connecting rod 5 includes a rotating part 18 that is rotatably connected to the base 6. The rotating part 18 is U-shaped, and its left and right ends extend forward to both sides of the base 6 and are connected to the left and right sides of the base 6. The rotating part 18 is rotatably connected to the base 6; the rotating part 18 is provided with a first inclined rod part 19 extending backward and upward at an angle, and a vertical rod part 20 for mounting the backrest 7 is provided on the first inclined rod part 19. The sleeve part 12 is sleeved on the vertical rod part 20, and the vertical rod part 20 is inserted into the slot 13. The first mounting seat 16 is provided on the first inclined rod part 19; the second connecting rod 4 also includes a second inclined rod part 21, which extends forward and upward at an angle from the front end of the base 6. The second mounting seat 17 is provided on the second inclined rod part 21; the first inclined rod part 19 and the second inclined rod part 21 are also conducive to suspending the seat part 8 and can prevent the seat part 8 from interfering with the first connecting rod 5 and the base 6.

[0032] Both the first connecting rod 5 and the second connecting rod 4 are branched: there are two first diagonal rods 19, which are forked on the left and right sides and are connected to the seat 8; there are two second diagonal rods 21, which are forked on the left and right sides and are connected to the seat 8; the branched structure forms a four-point connection when connected to the seat 8, making the connection more stable and ensuring that the seat 8 remains stable when supporting the human body; from the front, the armrest frame 1 is roughly U-shaped, and from the side it is roughly O-shaped.

[0033] like Figure 8 , 9 As shown, the seat also includes a tilting elastic element 22, which is configured to provide a spring force for the backrest 7 to rotate forward. It is located between the first link 5 and the second link 4, with one end linked to the first link 5 and the other end remaining relatively stationary with the second link 4. When the backrest 7 tilts backward, the tilting elastic element 22 deforms and generates a spring force, which can both buffer the backward tilt of the backrest 7 to prevent rapid tilting and provide assistance when the backrest 7 returns to its forward position to help the user return to an upright sitting posture.

[0034] Specifically, the tilting elastic element 22 is a telescopic spring, installed in the seat 8, with one end connected to the seat 8; the second connecting rod 4 is provided with a connector 23, which is inserted and fixed in the second mounting base 17, and the other end of the tilting elastic element 22 is connected to the connector 23; when the backrest 7 tilts backward, the seat 8 moves backward accordingly and stretches the tilting elastic element 22; since the tilting elastic element 22 is usually large in size to resist the force of the human body, placing it in the seat 8 can significantly reduce the volume of the base 6 (only a small amount is needed in the base 6). (The components for controlling the pneumatic rod and locking / unlocking the rotation of the first linkage 5 are provided). The seat 8 includes a bottom shell 24, a tilt elastic member 22 is disposed above the bottom shell 24, the bottom shell 24 has a clearance groove 25 in the front-rear direction, and the connecting member 23 enters the bottom shell 24 from the clearance groove 25 and connects with the tilt elastic member 22; the bottom shell 24 is provided with a guide rail 26, and the connecting member 23 is provided with a roller 27. The roller 27 is located inside the bottom shell 24 and abuts against the guide rail 26, which can reduce wear and make the movement of the seat 8 and the second linkage 4 smoother.

[0035] In addition, the tilting elastic element 22 can also be a torsion spring, which can be set in the base 6 (in this case, the tilting elastic element 22 includes two spring arms, which are respectively connected to the base 6 and the first connecting rod 5); however, setting it in the base 6 will increase the volume of the base 6. Therefore, in this embodiment, it is preferred to set the tilting elastic element 22 in the seat 8 - the seat 8 itself has a certain thickness, and it is only necessary to partially hollow it out to make room, which will not affect the overall thickness of the seat 8.

[0036] In this embodiment, the seat 8 can be movable and linked even without the armrest frame 1, that is, as shown in the example. Figure 15 , 16 As shown, the handrail support 2 and the movable connecting rod 3 are removed, leaving only the first connecting rod 5 and the second connecting rod 4. Based on this, the first connecting rod 5 is rotatably connected to the seat 8 at a first point A, and the second connecting rod 4 is slidably and rotatably engaged with the seat at a second point B. Specifically, the first point A is formed on the first mounting base 16, and the first point A remains relatively fixed relative to both the first connecting rod 5 and the seat 8. The second point B is indirectly formed on the second mounting base 17 through the roller 27, and the second point B is relatively fixed relative to the second connecting rod 4. When the first connecting rod 5 rotates relative to the second connecting rod 4, the distance between the first point A and the second point B changes, and the seat 8 slides and rotates relative to the second point B.

[0037] In addition, such as Figure 10-14As shown, a cover plate 28 is provided inside the bottom shell 24. The cover plate 28 is located above the clearance groove 25. The roller 27 is located between the cover plate 28 and the bottom shell 24 and abuts against the cover plate 28. The guide rail 26 is formed between the bottom shell 24 and the cover plate 28. The cover plate 28 and the bottom shell 24 are fixedly connected by screws. The cover plate 28 is located above the roller 27. When the seat is in use, the front part of the seat 8 is mainly supported by the abutment between the cover plate 28 and the roller 27. The second point B is formed at the abutment of the two.

Claims

1. A type of seat, characterized in that: The system includes a second link, which includes a base configured to connect to the support base of the seat. A first link is rotatably connected to the base and is located behind the second link. Both the first and second links have seats. The rear of the seat is movably connected to the first link, and the connection point between the two is a first point. The front of the seat is movably connected to the second link, and the connection point between the two is a second point. The first link is configured such that when the first link rotates relative to the second link, the distance between the first and second points changes, causing the seat to tilt.

2. The seat according to claim 1, characterized in that: The first link is rotatably engaged with the seat, and the first point remains relatively fixed relative to both the first link and the seat; the second link is slidably rotatably engaged with the seat, and the second point is relatively fixed relative to the second link. When the first link rotates relative to the second link, the seat slides and rotates relative to the second point.

3. The seat according to claim 1, characterized in that: The base has a vertical length of 50-70mm, a front-to-back dimension of 90-120mm, and a left-to-right dimension of 60-70mm.

4. The seat according to claim 1, characterized in that: The base is located below the seat, and the seat is cantilevered relative to the base, creating a cantilevered space between the base and the seat in the vertical direction.

5. The seat according to claim 1 or 4, characterized in that: The first link includes a rotating part that is rotatably connected to the base, and the rotating part is provided with a first inclined bar extending obliquely to the rear and upward; the second link also includes a second inclined bar extending obliquely to the front and upward from the front end of the base, and the base is connected to the first inclined bar and the second inclined bar respectively.

6. The seat according to claim 5, characterized in that: A first mounting seat with an upward protrusion is provided on the first inclined rod portion, and a second mounting seat with an upward protrusion is provided on the second inclined rod portion. The first mounting seat is connected to the rear part of the seat portion, and the second mounting seat is connected to the front part of the seat portion. A first point is formed on the first mounting seat, and a second point is formed directly or indirectly on the second mounting seat.

7. The seat according to claim 6, characterized in that: The base includes a bottom shell with a clearance groove arranged in the front-to-back direction; a connector is provided on the second mounting base, the connector enters the bottom shell from the clearance groove, guide rails are formed on both sides of the bottom shell with the clearance groove, a roller is provided on the connector, the roller is located in the bottom shell and abuts against the guide rail, and a second point is formed on the roller.

8. The seat according to claim 7, characterized in that: The bottom shell is equipped with a cover plate, which is located above the clearance groove. The roller is located between the cover plate and the bottom shell and abuts against the cover plate. The guide rail is formed between the bottom shell and the cover plate.

9. The seat according to claim 5, characterized in that: The rotating part is U-shaped, with its left and right ends extending forward to both sides of the base and rotatably connected to the base on both sides.

10. The seat according to claim 5, characterized in that: Both the first and second connecting rods are branched, with two first diagonal rods, which are forked on the rotating part and connected to the seat; and two second diagonal rods, which are forked on the base and connected to the seat.

11. The seat according to claim 1, characterized in that: The first link is provided with a backrest. The first link includes a rotating part that is rotatably connected to the base. The rotating part is provided with a first inclined bar that extends backward and upward. The first inclined bar is provided with a vertical bar for installing the backrest.

12. The seat according to claim 11, characterized in that: The backrest includes a sleeve portion with a slot, which is fitted onto a vertical rod portion, which is inserted into the slot.

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