A seat

Abstract

The utility model discloses a seat, including support base, its upper connection support, and the support includes the connecting rod of the lower end of middle part of connecting support base, and the support of two ends upward extension, two supports hinged rotation connecting rod and back frame, the seat department is suspended in the upper of connecting rod, and the lower end of rotation connecting rod is connected with the middle part of seat department, and the back frame lower extreme is connected with the rear part of seat department, and the seat department is hung on the support through both, and the upper portion of support has the support pole of forward and backward extension, and the support pole is connected with the middle lower part of back frame rotation, when back frame leans backward, the lower extreme drives seat department to move forward and upward, and rotation connecting rod moves along with seat department and restricts its track, the seat does not need to set up L shape rotation connecting portion on back frame additionally, and back frame is directly connected with support, seat department rotation, while reserving seat department overhead, seat back linkage, bottom disc advantage, simplifies the structure, reduces production assembly cost.

Description

Technical Field

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

[0002] Chairs are an indispensable tool in both home and office environments. Comfort requirements are increasingly high not only at home but also in the office, where efficiency demands are driven by improved comfort and ease of use. Currently, the design of most chairs with traditional chassis structures limits the movement of the seat when the user leans back; the backrest and seat movements are independent. This causes a change in the distance between the backrest and seat when leaning back, resulting in relative displacement and friction between the backrest and the user's back when the seat position remains unchanged. This leads to discomfort and what is commonly referred to as "back rubbing" or "lumbar back pain."

[0003] To address the aforementioned issues, manufacturers have introduced chairs with ergonomically linked backrests, collectively known as seat-back linkage chairs. Currently, most seat-back linkage chairs achieve this linkage between the backrest and seat through a chassis structure beneath the seat. However, the fit and structure of the chassis are undoubtedly complex and cumbersome, resulting in high processing and manufacturing costs.

[0004] Previously, we had launched several seat designs for the solution of removing the chassis to achieve seat-back linkage, such as the different seat designs in the Chinese utility model patent with patent number CN202421909047.5; however, the structures of the launched models are still relatively complex. If we want to further reduce costs, we need a more streamlined solution. Summary of the Invention

[0005] To address the aforementioned technical problems, this utility model provides a seat, including a supporting base connected to a bracket. The bracket includes a connecting rod with its lower middle end connected to the supporting base, and supports extending upwards at both ends. The two supports are hinged to a rotating connecting rod and a back frame. The seat is suspended above the connecting rod, with the lower end of the rotating connecting rod rotatably connected to the middle of the seat and the lower end of the back frame rotatably connected to the rear of the seat. The seat is suspended on the bracket via these two components. The upper part of the supports has a front-to-back extending support rod, which is rotatably connected to the lower part of the back frame. When the back frame tilts backward, its lower end drives the seat to move forward and upward, and the rotating connecting rod moves with the seat and restricts its trajectory. This seat eliminates the need for an additional L-shaped rotating connecting part on the back frame; the back frame is directly rotatably connected to the bracket and the seat. While retaining the advantages of an elevated seat, seat-back linkage, and no chassis, it simplifies the structure and reduces production and assembly costs.

[0006] The technical solution of this utility model is implemented as follows: A type of chair: It includes a support base, on which a bracket is connected. The bracket includes a connecting rod located at the lower middle part of the bracket and connected to the support base, and two supports located at both ends of the connecting rod and extending upward. The two supports are rotatably connected to a rotating connecting rod and a back frame. It also includes a seat suspended above the connecting rod, the lower end of the rotating connecting rod is rotatably connected to the middle part of the seat, the lower end of the back frame is rotatably connected to the rear part of the seat, and the seat is suspended on the bracket by the rotating connecting rod and the back frame; The support includes a support rod located on its upper part and extending longitudinally back and forth. The support rod is rotatably connected to the lower part of the back frame. When the back frame tilts backward on the support rod, the lower end of the back frame drives the seat to move forward and upward. The rotating linkage is configured to rotate on the support with the movement of the seat and limit the movement trajectory of the seat.

[0007] In previous chairs of this type, an L-shaped "rotating connector" was almost always used. The rotating connector was fixed to the backrest and rotatably connected to the seat and frame to achieve seat-back linkage. In this solution, the back frame is directly rotatably connected to the frame and seat, eliminating the need for an additional L-shaped plate-like connecting rod on the back frame for rotational connection. This results in a more streamlined structure and reduced production and assembly costs. While maintaining the original seat's features of an open seat, seat-back linkage, and chassis-free design, the overall structure has been further simplified, reducing production costs.

[0008] In this type of chair, the seat is suspended and linked to the back frame, keeping both in a balanced floating state (when unlocked). In this state, the user can switch between sitting normally and reclining. When switching from sitting normally to reclining, the user's back moves backward and downward, driving the back frame to rotate backward on the support. Due to the seat-back linkage, the backward pushing force exerted by the user on the back frame is converted into an upward lifting force from the seat to overcome the user's own weight. The seat moves upward and forward with the movement of the back frame. When reclining, the pressure exerted by the user's back on the back frame and the pressure exerted by the buttocks on the seat are balanced, allowing the chair to maintain this state. When switching from reclining to sitting normally, the user gets up, disrupting the force balance between the back frame and the seat. The pressure exerted by the user's buttocks on the seat becomes a pushing force from the back frame on the user's back, making it easier for the user to get up.

[0009] Preferably, the support frame is U-shaped, with connecting rods arranged laterally in the left-right direction. The support also includes a curved rod, the lower end of which is connected to the connecting rod, the upper end of which is connected to the front end of the support rod, and the rear end of the support rod is rotatably connected to the lower middle part of the back frame. The structure of the support frame is further simplified, with the entire support frame being a continuous rod, which, after bending, forms connecting rods, curved rods, and support rods. This not only simplifies the structure but also makes it easy to manufacture, which also helps to streamline the overall structure and reduce production costs.

[0010] Preferably, the support also includes a reinforcing plate disposed between the crank and the support rod, with the upper end of the rotating connecting rod rotatably connected to the reinforcing plate. The reinforcing plate is welded to the crank and the support rod after the support is bent, ensuring that the formed support remains simple and convenient. The reinforcing plate can strengthen the strength between the crank and the support rod, prevent the support from deforming, and at the same time provide sufficient space for connecting the rotating connecting rod.

[0011] Preferably, the rotating connecting rod is provided with a number of shift holes, which are located on the upper part of the rotating connecting rod and distributed circumferentially around the rotational connection point between the rotating connecting rod and the support; a locking element and a control element are provided on the reinforcing plate, and the reinforcing plate is provided with clearance holes. The locking element is slidably disposed in the clearance holes in the left and right directions. The locking element is configured to selectively enter any shift hole through the clearance holes to lock the rotating connecting rod; the control element is rotatably disposed on the reinforcing plate and configured to drive the locking element into or out of the shift holes. Since the rotating link, bracket, seat, and back frame constitute a four-bar linkage, locking the rotating link is equivalent to locking the seat and back frame. Therefore, the position hole, locking device, and control device can keep the back frame and seat in their original positions after movement, allowing the seat to have multiple tilt positions for the user to choose from. With sufficient space for the connection between the reinforcing plate and the rotating link, the reinforcing plate with ample space can also accommodate locking devices and control devices. Setting the position hole on the rotating link instead of the back frame also helps control the production cost of the back frame. Setting the position hole on the rotating link is not only convenient and simple, but also lower in cost.

[0012] Preferably, the upper part of the rotating linkage is also provided with a limiting groove, and the reinforcing plate is also provided with a limiting component. The limiting component is set in the limiting groove to limit the rotation angle of the rotating linkage. The limiting component and the limiting groove can control the rotation angle of the rotating linkage, which can also control the tilt angle of the back frame and prevent the seat from tipping over due to excessive tilt angle of the back frame.

[0013] Preferably, a first cover plate and a second cover plate are provided on both sides of the reinforcing plate, which interlock with each other. The first cover plate has a window for avoiding the control components, and the second cover plate has a relief groove for avoiding the rotation of the rotating linkage. The first and second cover plates can cover the rotating linkage, making the seat more aesthetically pleasing, preventing damage to the rotating linkage, and preventing the user's hand from being pinched by the rotating linkage, thus improving safety.

[0014] Preferably, the back frame includes a main frame forming a closed frame and two downward-extending extension rods located on the left and right sides of the main frame. The lower ends of the extension rods are rotatably connected to the rear of the seat. The support rods are rotatably connected to the main frame. Compared with a traditional back frame, the back frame only has two additional downward-extending extension rods, which can be integrally formed with the main frame. Furthermore, the back frame is formed by bending and welding a tubular component. The same tubular component is bent to form two vertical rods on the left and right sides and an upper horizontal rod at the top. A horizontal rod is welded to the lower part of the two vertical rods, so that the lower horizontal rod and the part above it form the main frame, and the vertical rod below the lower horizontal rod is the extension rod, which is part of the vertical rod. Compared with the original back frame connecting L-shaped connecting rods, the structure is more streamlined, easier to produce, and lower in cost.

[0015] Preferably, two connecting ears are fixedly provided on each side of the base. The two connecting ears on the same side are located in the middle and rear of the base, respectively. The back frame and the rotating connecting rod are rotatably connected to the connecting ears at different positions.

[0016] Preferably, the support rod is equipped with handrails. In addition to being used to rotate and connect the back frame, the support rod can also be used to install handrails to support the user's arms, serving two purposes at once.

[0017] The design starting point, concept, and beneficial effects of this utility model, which adopts the above technical solution, are as follows: In previous chairs of this type, an L-shaped "rotating connector" was almost always used. The rotating connector was fixed to the backrest and rotatably connected to the seat and frame to achieve seat-back linkage. In this solution, the back frame is directly rotatably connected to the frame and seat, eliminating the need for an additional L-shaped plate-like connecting rod on the back frame for rotational connection. This results in a more streamlined structure and reduced production and assembly costs. While maintaining the original seat's features of an open seat, seat-back linkage, and chassis-free design, the overall structure has been further simplified, reducing production costs.

[0018] The structure of the support has also been further simplified. The support is a continuous rod, and after bending, it forms connecting rods, curved rods, and support rods. This not only makes the structure simple and easy to manufacture, but also helps to streamline the overall structure and reduce production costs.

[0019] In this type of chair, the seat is suspended and linked to the back frame, keeping both in a balanced floating state (when unlocked). In this state, the user can switch between sitting normally and reclining. When switching from sitting normally to reclining, the user's back moves backward and downward, driving the back frame to rotate backward on the support. Due to the seat-back linkage, the backward pushing force exerted by the user on the back frame is converted into an upward lifting force from the seat to overcome the user's own weight. The seat moves upward and forward with the movement of the back frame. When reclining, the pressure exerted by the user's back on the back frame and the pressure exerted by the buttocks on the seat are balanced, allowing the chair to maintain this state. When switching from reclining to sitting normally, the user gets up, disrupting the force balance between the back frame and the seat. The pressure exerted by the user's buttocks on the seat becomes a pushing force from the back frame on the user's back, making it easier for the user to get up. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the seat back frame when it is vertical in an embodiment of the present invention. Figure 1 ; Figure 2 This is a three-dimensional structural diagram of the seat back frame when it is vertical in an embodiment of the present invention. Figure 2 ; Figure 3 This is a three-dimensional structural diagram of the seat back frame when it is reclined in an embodiment of the present invention; Figure 4 This is a three-dimensional structural diagram of the back frame in an embodiment of the present invention; Figure 5 This is a three-dimensional structural diagram of the bracket in the embodiments of this utility model; Figure 6 This is a three-dimensional structural diagram of the locking member cooperating with the stop hole when the back frame is vertical in an embodiment of the present invention; Figure 7 This is a three-dimensional structural diagram of the locking component and the gear hole when the back frame is reclined in an embodiment of the present invention; Figure 8 This is a three-dimensional structural diagram of the locking member in the locking position in an embodiment of the present invention; Figure 9 This is a three-dimensional structural diagram of the locking element in the unlocking position in an embodiment of the present invention.

[0021] The attached figures are labeled as follows: 2. Support base; 3. Bracket; 31. Connecting rod; 32. Support; 321. Curved rod; 322. Reinforcing plate; 323. Clearance hole; 324. Mounting hole; 326. Seat; 4. Connecting ear; 41. Back frame; 5. Main frame; 51. Vertical rod; 511. Upper horizontal rod; 512. Extension rod; 52. Lower horizontal rod; 53. Rotating connecting rod; 6. Stop hole; 61. Limiting groove; 62. Handrail; 7. Locking component; 9. Control component; 10. Inclined surface; 101. Unlocking position; 102. Locking position; 103. First cover plate; 111. Window; 112. Mounting column; 112. Second cover plate; 121. Clearance groove; 13. Spring. 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 1-3 As shown, this utility model provides a seat: It includes a support base 2, on which a bracket 3 is connected. The bracket 3 includes a connecting rod 31 located at the lower middle part of the bracket 3 and connected to the support base 2, and two supports 32 located at both ends of the connecting rod 31 and extending upward. The two supports 32 are rotatably connected to a rotating connecting rod 6 and a back frame 5. It also includes a seat 4 suspended above the connecting rod 31, the lower end of the rotating connecting rod 6 is rotatably connected to the middle part of the seat 4, the lower end of the back frame 5 is rotatably connected to the rear part of the seat 4, and the seat 4 is suspended on the bracket 3 by the rotating connecting rod 6 and the back frame 5. The support 32 includes a support rod 321 located on its upper part and extending longitudinally back and forth. The support rod 321 is rotatably connected to the lower part of the back frame 5. When the back frame 5 tilts backward on the support rod 321, the lower end of the back frame 5 drives the seat 4 to move forward and upward. The rotating link 6 is configured to rotate on the support 32 with the movement of the seat 4 and limit the movement trajectory of the seat 4.

[0026] In previous chairs of this type, an L-shaped "rotating connector" was almost always used. The rotating connector was fixed to the backrest and rotatably connected to the seat and the support 3, thereby realizing the linkage between the seat and the backrest. In this solution, the back frame 5 is directly rotatably connected to the support 3 and the seat 4, eliminating the need for an additional L-shaped plate-like connecting rod on the back frame 5 for rotational connection. This makes the structure more streamlined and reduces production and assembly costs. While maintaining the original seat's features of an open seat 4, the linkage between the seat and the backrest, and the advantage of no chassis, the overall structure has been further simplified, reducing production costs.

[0027] Specifically, the support base 2 includes a gas spring and a five-star base. The two ends of the gas spring are connected to the bracket and the five-star base, respectively. The structures of the back frame 5 and the bracket 3 have been simplified: [e.g., ...] Figure 4 As shown, the back frame 5 includes a main frame 51 forming a closed frame and two extension rods 52 located on the left and right sides of the main frame 51 and extending downwards. The lower end of the extension rods 52 is rotatably connected to the rear of the seat 4. The support rod 321 is rotatably connected to the main frame 51. Compared with the traditional back frame, the back frame 5 only has two additional downward-extending extension rods 52, and the extension rods 52 can be integrally formed with the main frame 51. Furthermore, the back frame 5 is formed by bending and welding a tube. The same tube is bent to form two vertical rods 511 on the left and right and an upper horizontal rod 512 at the top. A horizontal rod 53 is welded to the lower part of the two vertical rods 511, so that the lower horizontal rod 53 and the part above it constitute the main frame 51, and the vertical rod 511 below the lower horizontal rod 53 constitutes the extension rod 52, and the extension rod 52 is a part of the vertical rod 511. Compared with the original back frame connecting L-shaped connecting rods, the structure is more concise, easier to produce and lower in cost.

[0028] like Figure 5 As shown, the bracket 3 is U-shaped, with the connecting rod 31 arranged laterally in the left-right direction; the support 32 also includes a curved rod 322, the lower end of which is connected to the connecting rod 31, the upper end of which is connected to the front end of the support rod 321, and the rear end of the support rod 321 is rotatably connected to the lower middle part of the back frame 5; the structure of the bracket 3 is further simplified, with the bracket 3 as a single continuous rod, which, after bending, forms the connecting rod 31, the curved rod 322, and the support rod 321, making the structure not only simple but also easy to manufacture, and also conducive to overall simplification. The structure is improved, and production costs are reduced. Furthermore, the support 32 also includes a reinforcing plate 323 disposed between the curved rod 322 and the support rod 321. The upper end of the rotating connecting rod 6 is rotatably connected to the reinforcing plate 323. After the support 3 is bent, the reinforcing plate 323 is welded to the space between the curved rod 322 and the support rod 321, ensuring that the forming support 3 remains simple and convenient. The reinforcing plate 323 can strengthen the strength between the curved rod 322 and the support rod 321, prevent the support 32 from deforming, and at the same time provide sufficient space for connecting the rotating connecting rod 6.

[0029] The structure of the back frame 5 and the bracket 3 is simpler than that of previous chairs of this type, while still achieving the original functions and effects. This reduces production costs, allowing manufacturers to have greater profits and maintain the price advantage of this type of chair to remain competitive in the market. The support rod 321 is also equipped with an armrest 7. In addition to being used to rotate and connect the back frame 5, the support rod 321 can also be used to install the armrest 7 to support the user's arms, achieving two purposes at once.

[0030] Furthermore, two connecting ears 41 are fixedly provided on each side of the seat 4. The two connecting ears 41 on the same side are located in the middle and rear of the seat 4, respectively. The back frame 5 and the rotating connecting rod 6 are rotatably connected to the connecting ears 41 at different positions. When the rear end of the support rod 321 is rotatably connected to the back frame 5, the two are directly rotatably connected through the pivot. When the lower end of the back frame 5 is rotatably connected to the seat 4, it is also closer to a direct rotatable connection. Therefore, the rotatable connections related to the back frame 5 are all direct rotatable connections, rather than indirect rotatable connections. This point also reflects the simplification of the seat structure.

[0031] In this seat, the rotating link 6, the bracket 3, the seat 4, and the back frame 5 constitute a four-bar linkage mechanism. The user's lower back rests on the back frame 5, and their buttocks and legs rest on the seat 4. When the user leans back, the back frame 5 tilts and rotates backward, thereby driving the seat 4 and the rotating link 6 to move. Under the suspension of the back frame 5 and the rotating link 6, the seat 4 has a forward and upward movement trajectory, thereby achieving the effect of preventing back rubbing and improving the comfort of the seat. In addition, the restriction on the rotating link 6 will simultaneously affect the seat 4 and the back frame 5. Therefore, a structure for controlling the tilt angle can be set on the rotating link 6.

[0032] Specifically, such as Figure 6-9As shown, a plurality of gear holes 61 are provided on the rotating connecting rod 6. The gear holes 61 are located on the upper part of the rotating connecting rod 6 and are circumferentially distributed with the rotational connection point between the rotating connecting rod 6 and the support 32 as the center. A locking member 9 and a control member 10 are provided on the reinforcing plate 323. The reinforcing plate 323 is provided with a clearance hole 324. The locking member 9 is slidably disposed in the clearance hole 324 in the left and right direction. The locking member 9 is configured to selectively enter any gear hole 61 through the clearance hole 324 to lock the rotating connecting rod 6. The control member 10 is rotatably disposed on the reinforcing plate 323 and is configured to drive the locking member 9 into or out of the gear hole 61. Due to the rotating connecting rod 6, the support 3, the seat 4, and the back frame 5 This constitutes a four-bar linkage mechanism. Therefore, locking the rotating link 6 is equivalent to locking the seat 4 and the back frame 5. Thus, the gear position hole 61, locking element 9, and control element 10 can keep the back frame 5 and seat 4 in their moved positions, allowing the seat to have multiple tilt positions for the user to choose from. With sufficient space for the connection between the reinforcing plate 323 and the rotating link 6, the reinforcing plate 323 with sufficient space is also suitable for setting the locking element 9, control element 10, etc. Setting the gear position hole 61 on the rotating link 6 instead of the back frame 5 is also beneficial for controlling the production cost of the back frame 5. Setting the gear position hole 61 on the rotating link 6 is not only convenient and simple, but also lower in cost.

[0033] The locking member 9 is columnar and has springs 13 on both its front and rear sides. The locking member 9 is floating on the reinforcing plate 323 by the two springs 13. The control member 10 controls the movement of the locking member 9 by the inclined surface 101. There are unlocking positions 102 and locking positions 103 on both sides of the inclined surface 101. The height of the unlocking position 102 is lower than the height of the locking position 103. That is, the locking position 103 protrudes more and is closer to the locking member 9 than the unlocking position 102. When the control member 10 rotates, the locking member 9 moves on the inclined surface 101 until it moves to the locking position 103 or the unlocking position 102.

[0034] The upper part of the rotating link 6 is also provided with a limiting groove 62, and the reinforcing plate 323 is also provided with a limiting component. The limiting component is set in the limiting groove 62 to limit the rotation angle of the rotating link 6. The limiting component and the limiting groove 62 can control the rotation angle of the rotating link 6, which can also control the tilt angle of the back frame 5, preventing the back frame 5 from tilting too much and causing the seat to tip over.

[0035] A first cover plate 11 and a second cover plate 12 are provided on both sides of the reinforcing plate 323 and are interlocked. The first cover plate 11 has a window 111 for avoiding the control component 10, and the second cover plate 12 has a relief groove 121 for avoiding the rotation of the rotating linkage 6. The first and second cover plates can cover the rotating linkage 6, making the seat more aesthetically pleasing, preventing damage to the rotating linkage 6, and preventing the user from being pinched by the rotating linkage 6, thus improving safety. The reinforcing plate 323 has three mounting holes 326, and the first cover plate 11 has three corresponding mounting posts 112. The mounting posts 112 pass through the mounting holes 326 and are connected to the second cover plate 12 by screws.

Claims

1. A type of seat, characterized in that: It includes a support base, on which a bracket is connected. The bracket includes a connecting rod located at the lower middle part of the bracket and connected to the support base, and two supports located at both ends of the connecting rod and extending upward. The two supports are rotatably connected to a rotating connecting rod and a back frame. It also includes a seat suspended above the connecting rod, the lower end of the rotating connecting rod is rotatably connected to the middle part of the seat, the lower end of the back frame is rotatably connected to the rear part of the seat, and the seat is suspended on the bracket by the rotating connecting rod and the back frame; The support includes a support rod located on its upper part and extending longitudinally back and forth. The support rod is rotatably connected to the lower part of the back frame. When the back frame tilts backward on the support rod, the lower end of the back frame drives the seat to move forward and upward. The rotating linkage is configured to rotate on the support with the movement of the seat and limit the movement trajectory of the seat.

2. The seat according to claim 1, characterized in that: The bracket is U-shaped, with connecting rods arranged laterally in the left-right direction; the bracket also includes a curved rod, the lower end of which is connected to the connecting rod, the upper end of which is connected to the front end of the support rod, and the rear end of the support rod is rotatably connected to the lower middle part of the back frame.

3. The seat according to claim 2, characterized in that: The support also includes a reinforcing plate disposed between the crank and the support rod, and the upper end of the rotating connecting rod is rotatably connected to the reinforcing plate.

4. The seat according to claim 3, characterized in that: The rotating connecting rod is provided with several gear holes, which are located on the upper part of the rotating connecting rod and are circumferentially distributed with the rotation connection point between the rotating connecting rod and the support as the center. A locking component and a control component are provided on the reinforcing plate. The reinforcing plate is provided with clearance holes. The locking component is slidably disposed in the clearance holes in the left and right directions. The locking component is configured to selectively enter any gear hole through the clearance holes to lock the rotating connecting rod. The control component is rotatably disposed on the reinforcing plate and is configured to drive the locking component to enter or leave the gear hole.

5. The seat according to claim 4, characterized in that: The upper part of the rotating connecting rod is also provided with a limiting groove, and the reinforcing plate is also provided with a limiting component. The limiting component is set in the limiting groove to limit the rotation angle of the rotating connecting rod.

6. The seat according to claim 4, characterized in that: The reinforcing plate has a first cover plate and a second cover plate that interlock with each other. The first cover plate has a window for avoiding the control component, and the second cover plate has a clearance groove for avoiding the rotation of the rotating linkage.

7. The seat according to claim 1, characterized in that: The back frame includes a main frame that forms a closed frame and two extension rods located on the left and right sides of the main frame and extending downwards. The lower ends of the extension rods are rotatably connected to the rear of the seat; the support rods are rotatably connected to the main frame.

8. The seat according to claim 1, characterized in that: Two connecting ears are fixed on each side of the base. The two connecting ears on the same side are located in the middle and rear of the base, respectively. The back frame and the rotating connecting rod are rotatably connected to the connecting ears at different positions.

9. The seat according to claim 1, characterized in that: The support rod is equipped with a handrail.

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