Back cushion angle adjusting structure and fitness stool
By using a linkage adjustment structure and a linkage mechanism, stepless angle adjustment of the backrest and seat cushion is achieved, solving the problem of limited adjustment angle of the backrest in existing fitness benches and improving the user experience and safety.
Patent Information
- Application Number
- CN202423096341.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2034-12-16
AI Technical Summary
Existing fitness benches have limited backrest adjustment angles, which cannot meet individual needs, and the linkage adjustment between the backrest and the seat is insufficient, resulting in uncomfortable sitting posture and poor user experience.
By designing a linkage adjustment structure between the backrest and the seat cushion, stepless adjustment is achieved using a linkage mechanism. A braking component and rollers are also provided to ensure stability and flexibility. The backrest and the seat cushion are connected by a linkage mechanism, and the backrest automatically adjusts its angle when the seat cushion slides.
It achieves stepless linkage adjustment between the backrest and seat cushion, improving user comfort and safety, reducing physical fatigue and the risk of injury caused by improper sitting posture, and enhancing the functionality and adaptability of the fitness bench.
Smart Images
Figure CN223760328U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fitness equipment technology, and in particular to a backrest angle adjustment structure and a fitness stool with a backrest angle adjustment structure. Background Technology
[0002] In existing fitness benches, the backrest typically uses a positional adjustment system, meaning the backrest can only be adjusted to a few preset angles. This design has limitations because it cannot meet the personalized needs of different users for backrest tilt angles. Furthermore, existing fitness benches often only allow for backrest adjustment, while the seat position remains unchanged. This can lead to discomfort for users when adjusting the backrest angle. Therefore, how to achieve coordinated adjustment between the backrest and seat, while providing a more flexible backrest angle adjustment function, has become a pressing issue. Utility Model Content
[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a backrest angle adjustment structure. Through the linkage design of the backrest and seat cushion and the stepless adjustment function, it significantly improves the user's comfort and flexibility, ensures that the user can maintain the best sitting posture in different training positions, effectively reduces physical fatigue and the risk of injury, and improves the overall user experience.
[0004] This utility model also proposes a fitness stool with the above-mentioned backrest angle adjustment structure.
[0005] The back pad angle adjustment structure according to this utility model includes:
[0006] Base frame;
[0007] A seat cushion for sitting on the buttocks, the seat cushion being slidably disposed on the base frame in a linear direction;
[0008] A backrest is used to support the back. One end of the backrest is rotatably connected to the seat cushion, and the other end is connected to the base frame through a linkage mechanism.
[0009] When the seat cushion slides, the back cushion rotates about the rotation axis connected to the seat cushion to infinitely adjust the tilt angle between the back cushion and the seat cushion.
[0010] According to the backrest angle adjustment structure described in this utility model, it has at least the following beneficial effects: By designing the backrest and seat cushion to be linked for adjustment, and connecting the backrest and the base frame through a linkage mechanism, when the seat cushion slides along the linear direction of the base frame, the backrest can be infinitely adjusted around the rotation axis connected to the seat cushion. This design not only solves the problem of limited backrest adjustment angle and inconvenience in existing fitness benches, but also realizes the linkage between the backrest and seat cushion. In application, when the user adjusts the position of the seat cushion, the backrest will automatically adjust its angle accordingly, ensuring that the user can maintain optimal sitting comfort in different training postures. This linkage adjustment mechanism not only improves the user experience, but also reduces the risk of physical fatigue and injury caused by improper sitting posture, making the fitness bench better adaptable to different user body types and usage habits. In addition, the stepless adjustment function allows users to precisely adjust the angle of the backrest according to their needs, providing greater personalization and flexibility, and further enhancing the functionality and practicality of the fitness bench.
[0011] According to some embodiments of the present invention, the backrest angle adjustment structure is provided with a braking component, which is used to lock the seat cushion.
[0012] According to some embodiments of the present invention, the backrest angle adjustment structure includes an operating lever and a floating component. The floating component is vertically mounted on the seat cushion and can be disconnected from the base frame. The operating lever is rotatably mounted on the seat cushion and is connected to and drives the floating component to move downwards to press and fix it against the base frame.
[0013] According to some embodiments of the present invention, the backrest angle adjustment structure has a sliding frame slidably connected to one end of the base frame, the seat cushion is fixedly connected to the sliding frame, the floating component includes a braking block, a floating shaft and a compression spring, the sliding frame is fixedly connected to a first fixing block, the braking block is fixedly connected to a second fixing block, the floating shaft passes through the first fixing block and the second fixing block in a vertical direction, the compression spring is sleeved on the floating shaft, and the two ends of the compression spring are respectively pressed against the first fixing block and the second fixing block.
[0014] According to some embodiments of the present invention, the back pad angle adjustment structure includes multiple second fixing blocks, which are respectively arranged around the brake block. The floating shaft, the compression spring, and the first fixing block are also multiple and arranged in a one-to-one correspondence with the second fixing blocks.
[0015] According to some embodiments of the present invention, the back pad angle adjustment structure is fixedly connected to a pressure plate and used to drive the pressure plate to rotate. The pressure plate has a concave structure, and the braking block and the pressure plate are provided with an inclined surface and a stop surface connected in sequence at the mating part. When the pressure plate presses down on the braking block, the pressure plate presses against the inclined surface and the stop surface in sequence.
[0016] According to some embodiments of the present invention, the back pad angle adjustment structure is provided with a brake pad on the lower wall of the brake block, and the brake pad is made of silicone.
[0017] According to some embodiments of the present invention, the backrest angle adjustment structure is provided with rollers, and the seat cushion and the base frame are slidably connected by the rollers.
[0018] According to some embodiments of the present invention, the back pad angle adjustment structure is provided at the other end of the base frame, the back pad is fixedly connected to the follower frame, the linkage mechanism includes a first link, one end of the follower frame is hinged to the sliding frame, one end of the first link is hinged to the base frame, and the other end is hinged to the end of the follower frame away from the sliding frame.
[0019] The fitness stool according to this utility model includes the backrest angle adjustment structure described in this utility model.
[0020] The fitness stool according to this utility model has at least the following beneficial effects: by integrating the backrest angle adjustment structure, not only is the functionality and practicality of the fitness stool improved, but the user experience is also significantly improved, enabling the fitness stool to better adapt to the body shape and training needs of different users, and providing a more comfortable, safe and efficient fitness environment.
[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0022] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0023] Figure 1 This is a cross-sectional view of the back pad angle adjustment structure according to an embodiment of the present invention;
[0024] Figure 2 This is an exploded view of the overall back pad angle adjustment structure according to an embodiment of the present invention;
[0025] Figure 3 This is a partial exploded view of the back pad angle adjustment structure according to an embodiment of the present invention;
[0026] Figure 4 This is a schematic diagram of the backrest angle adjustment structure applied to a fitness bench according to an embodiment of this utility model.
[0027] Explanation of icon numbers:
[0028] Back pad 100; follower frame 110; connecting shaft 111;
[0029] Seat cushion 300; sliding frame 310; first fixing block 311; roller 320;
[0030] Leg press component 400;
[0031] Base frame 500; First link 510;
[0032] Braking assembly 600; operating lever 610; pressure plate 620; braking block 630; inclined surface 6301; stopping surface 6302; second fixing block 631; braking pad 640; compression spring 650. Detailed Implementation
[0033] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0034] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0035] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.
[0036] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0037] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0038] In existing fitness benches, the backrest typically uses a positional adjustment system, meaning the backrest can only be adjusted to a few preset angles. This design has limitations because it cannot meet the personalized needs of different users for backrest tilt angles. Furthermore, existing fitness benches often only allow for backrest adjustment, while the seat position remains unchanged. This can lead to discomfort for users when adjusting the backrest angle. Therefore, how to achieve coordinated adjustment between the backrest and seat, while providing a more flexible backrest angle adjustment function, has become a pressing issue.
[0039] Therefore, such as Figures 1 to 4 As shown, the backrest angle adjustment structure proposed in this utility model includes a base frame 500, a seat cushion 300 for sitting on the buttocks, and a backrest 100 for supporting the back. Specifically, the seat cushion 300 is slidably disposed on the base frame 500 along a linear direction. One end of the backrest 100 is rotatably connected to the seat cushion 300, and the other end is connected to the base frame 500 via a linkage mechanism. In some applications, when the seat cushion 300 slides, the backrest 100 rotates around the rotation axis connected to the seat cushion 300 to steplessly adjust the tilt angle between the backrest 100 and the seat cushion 300. It should be noted that by designing the backrest 100 and the seat cushion 300 to be linked for adjustment, and by connecting the backrest 100 to the base frame 500 via a linkage mechanism, when the seat cushion 300 slides along the linear direction of the base frame 500, the backrest 100 can be steplessly adjusted around the rotation axis connected to the seat cushion 300. This design not only solves the problems of limited backrest adjustment angle and inconvenience in existing fitness benches, but also achieves linkage between the backrest and seat. In application, when the user adjusts the position of the seat 300, the backrest 100 will automatically adjust its angle accordingly, ensuring that the user maintains optimal sitting comfort in different training postures. This linkage adjustment mechanism not only improves the user experience but also reduces physical fatigue and the risk of injury caused by improper sitting posture, allowing the fitness bench to better adapt to different users' body types and usage habits. In addition, the stepless adjustment function allows users to precisely adjust the angle of the backrest 100 according to their needs, providing greater personalization and flexibility, further enhancing the functionality and practicality of the fitness bench.
[0040] It's worth noting that the backrest 100 and seat cushion 300 are infinitely adjustable, providing users with great flexibility and personalization. The backrest 100's tilt angle can be adjusted arbitrarily within a certain range. Compared to traditional fixed or limited adjustment options, infinitely adjustable backrests allow for adjustments from completely flat to near-vertical angles, ensuring users can train in the most suitable posture. In the application, users can precisely adjust the tilt angle according to their needs to adapt to different training movements and individual body types.
[0041] Refer to Figures 1 to 3In some embodiments of this invention, the base frame 500 is equipped with a braking component 600, which is used to lock the seat cushion 300, providing users with greater safety and stability. This ensures that the seat cushion 300 will not move unexpectedly during training, thereby improving the overall user experience and training effect. By setting the braking component 600 on the base frame 500, users can firmly fix the seat cushion 300 in the desired position after adjusting its position. This locking mechanism not only prevents the seat cushion 300 from accidentally sliding during high-intensity or dynamic training, but also enhances the user's confidence and sense of security. For example, after adjustment, users can perform more precise training for specific muscle groups. For instance, when performing chest expansion stretches, users can adjust the angle of the backrest 100 according to their comfort and training goals to provide optimal back support while maintaining the correct movement trajectory. Such adjustments not only help improve training effectiveness but also reduce the risk of injury caused by improper posture, especially when performing movements requiring high stability. This high degree of adjustability not only enhances user comfort but also ensures optimal training posture during various movements, maximizing workout results. Furthermore, the stepless adjustment function enhances the user experience, allowing users to easily find the most suitable position whether performing strength training, flexibility exercises, or rehabilitation workouts. This not only improves training comfort but also increases user satisfaction and frequency of use of the fitness bench. For gyms or home fitness environments, this versatility and adaptability means that one device can meet multiple different types of training needs, thereby enhancing the overall value and practicality of the equipment. Moreover, during weight training or stretching exercises requiring maintaining specific postures, the stable seat 300 ensures that users always maintain correct body posture, reducing the risk of injury caused by equipment movement. Specifically, the braking assembly 600 includes an operating lever 610 and a floating component. The floating component is vertically mounted on the seat cushion 300 and can be disconnected from the base frame 500. The operating lever 610 is rotatably mounted on the seat cushion 300. The operating lever 610 connects to and drives the floating component downward to press and fix it against the base frame 500, significantly improving the convenience and reliability of locking and unlocking the exercise bench. In particular, the design of the operating lever 610 and the floating component allows users to more easily and accurately control the locked state of the seat cushion 300, thereby ensuring that the positions of the seat cushion 300 and the backrest 100 remain stable during use, avoiding discomfort or safety hazards caused by accidental movement.Firstly, the design of the operating lever 610 allows users to lock and unlock the seat cushion 300 through simple manual operation. Since the operating lever 610 is rotatably mounted on the seat cushion 300, users only need to gently rotate the operating lever 610 to drive the floating component to move downwards and press against and fix it against the base frame 500. This design is not only easy to operate, but also provides a clear tactile feedback, allowing users to intuitively feel the locked and unlocked status, reducing the chance of accidental locking or unlocking due to improper operation. For users who frequently adjust the position of the seat cushion 300 in environments such as gyms, this greatly improves efficiency and convenience. Furthermore, a sliding frame 310 is slidably connected to one end of the base frame 500, and the seat cushion 300 is fixedly connected to the sliding frame 310. The floating component includes a brake block 630, a floating shaft, and a compression spring 650. The sliding frame 310 is fixedly connected to a first fixing block 311, and the brake block 630 is fixedly connected to a second fixing block 631. The floating shaft passes through the first fixing block 311 and the second fixing block 631 in a vertical direction. The compression spring 650 is sleeved on the floating shaft, and the two ends of the compression spring 650 are respectively pressed against the first fixing block 311 and the second fixing block 631. The structure is simple and not only ensures the fixing effect of the seat cushion 300 and the back cushion 100 after adjustment, but also improves the ease of operation and the durability of the overall structure. First, the design of the sliding frame 310 makes the linear sliding of the seat cushion 300 smoother and more stable. The sliding frame 310 is slidably connected to one end of the base frame 500, and the seat cushion 300 is fixedly connected to the sliding frame 310. This design reduces direct friction between the seat cushion 300 and the base frame 500, lowering resistance during sliding. When adjusting the position of the seat cushion 300, the user can push it more easily, improving the convenience and comfort of adjustment. At the same time, the structure of the sliding frame 310 also increases the stability of the seat cushion 300, ensuring that the seat cushion 300 will not move unnecessarily due to slight external forces during use. Second, the combined design of the brake block 630, floating shaft, and compression spring 650 further enhances the reliability and stability of locking. This design allows the brake block 630 to move rapidly downward under the drive of the operating lever 610, forming a tight contact with the base frame 500 and achieving a secure locking effect. Furthermore, the presence of the compression spring 650 not only provides the necessary elastic support, but also helps the brake block 630 to quickly reset when unlocking, ensuring smooth operation every time. In addition, the elastic properties of the compression spring 650 can absorb and disperse the impact force during locking, protecting the various components from damage and extending the service life of the brake assembly 600.Optionally, there are multiple second fixing blocks 631, which are respectively arranged around the brake block 630. There are multiple floating shafts, compression springs 650 and first fixing blocks 311, which are arranged in a one-to-one correspondence with the second fixing blocks 631. This multi-point connection design not only ensures the contact area and locking force between the brake block 630 and the base frame 500, but also improves the durability and safety of the overall structure, thereby significantly improving the user experience.
[0042] Refer to Figure 1 In some embodiments of this utility model, the operating lever 610 is fixedly connected to a pressure plate 620 and is used to drive the pressure plate 620 to rotate. The pressure plate 620 has a concave structure, and the mating area between the brake block 630 and the pressure plate 620 is provided with a sequentially connected inclined surface 6301 and a stop surface 6302. When the pressure plate 620 presses down on the brake block 630, the pressure plate 620 sequentially presses against the inclined surface 6301 and the stop surface 6302, significantly improving the convenience and reliability of the exercise bench in locking and unlocking operations, and ensuring the smoothness and stability of the locking and unlocking process. It should be noted that the concave structure design of the pressure plate 620 makes it easier for the user to apply force during operation. When the user rotates the operating lever 610, the pressure plate 620 rotates accordingly. The concave structure design results in a larger contact area between the pressure plate 620 and the brake block 630, leading to more even force application and reducing the jerking sensation during operation. Secondly, the inclined surface 6301 and the stop surface 6302 at the mating point of the pressure plate 620 and the brake block 630 ensure the smoothness and stability of the locking and unlocking process. When the pressure plate 620 presses down on the brake block 630, the pressure plate 620 first presses against the inclined surface 6301, guiding the brake block 630 to gradually move downwards. The design of the inclined surface 6301 makes it easier for the pressure plate 620 to push the brake block 630 in the initial stage, reducing the force required during operation. As the pressure plate 620 continues to press down, it gradually contacts the stop surface 6302. At this point, the brake block 630 is completely pressed and fixed against the base frame 500, forming a secure locked state. The design of the stop surface 6302 ensures that the pressure plate 620 can stably hold the brake block 630 in the final position, avoiding locking failure due to loosening of the pressure plate 620. Optionally, a brake pad 640 is installed on the lower wall of the brake block 630. The brake pad 640 is made of silicone, which has good clamping performance, high durability, and does not damage the base frame 500.
[0043] Refer to Figures 1 to 3In some embodiments of this invention, the seat cushion 300 is equipped with rollers 320, and the seat cushion 300 and the base frame 500 slide together via the rollers 320, making the sliding between the seat cushion 300 and the base frame 500 smoother. Specifically, the rollers 320 are rotatably mounted on the sliding frame 310. When the user sits on the seat cushion 300, they can easily slide back and forth along the base frame 500 without having to push or drag the seat cushion 300. This low-friction design reduces the force required for movement, making it easy to adjust the position of the seat cushion 300. This is especially true when performing actions that require frequent adjustments to the position of the seat cushion 300, such as transitioning from a flat to a reclining position, or performing strength training and stretching exercises at different angles. The presence of the rollers 320 greatly simplifies this process and improves the efficiency and smoothness of training. In addition, the design of the rollers 320 also helps to maintain the stability of the entire fitness bench. Traditional exercise benches may wobble or become unstable during gliding due to uneven friction, affecting the user's workout experience. However, the rollers 320 evenly distribute the contact pressure between the seat cushion 300 and the base frame 500, ensuring smooth gliding of the seat cushion 300 even during rapid or large-amplitude movements, without unnecessary wobbling or vibration. This not only improves user comfort but also increases safety, especially during high-intensity or high-difficulty training exercises where stable support is crucial.
[0044] Refer to Figure 1 and Figure 4In some embodiments of this utility model, a follower frame 110 is provided at the other end of the base frame 500, and the back cushion 100 is fixedly connected to the follower frame 110. The linkage mechanism includes a first link 510. One end of the follower frame 110 is hinged to the sliding frame 310, and one end of the first link 510 is hinged to the base frame 500. The other end is hinged to the end of the follower frame 110 away from the sliding frame 310. Specifically, one end of the follower frame 110 is hinged to the sliding frame 310 through a connecting shaft 111, and the other end of the follower frame 110 is hinged to the end of the first link 510 away from the sliding frame 310. Thus, when the seat cushion 300 slides linearly, the back cushion 100 can swing accordingly. In some applications, when a user sits on the seat cushion 300, the back cushion 100 can rotate backward by moving the hips forward; and the back cushion 100 can rotate forward by moving the hips backward, so that the back cushion 100 fits the back for use. As is easily understood, in this application, when the seat cushion 300 slides, the backrest 100 rotates around the axis of rotation connected to the seat cushion 300, thus achieving dynamic adjustment. This greatly enhances the flexibility of the fitness bench, allowing users to adjust the position of the seat cushion 300 and the angle of the backrest 100 as needed when performing different types of training. For example, when performing chest expansion stretches or back muscle training, users can slide the seat cushion 300 to change the relative position of their body, and the backrest 100 will adjust its tilt angle accordingly to ensure optimal support and comfort at all times. This linkage mechanism not only simplifies the adjustment process but also ensures that users can exercise in the correct posture, reducing the risk of injury caused by improper posture. This dynamic adjustment function also provides users with a completely new fitness experience. Traditional fitness benches often only offer fixed or limited angle adjustments, while the fitness bench of this invention achieves smoother and more natural movement transitions through a linkage mechanism. Whether performing static strength training or dynamic stretching exercises, users can enjoy a seamless adjustment process, thereby achieving better training results and greater comfort. In some applications, dynamic stretching exercises correspond to the use state when the braking component 600 is not locked (seat 300), while static strength training corresponds to the use state when the braking component 600 is locked (seat 300). Furthermore, the application of a linkage mechanism improves the overall stability and durability of the device. The linkage mechanism can evenly distribute forces, maintaining structural stability even during high-intensity training. This not only boosts user confidence but also increases the safety of the equipment, allowing users to focus more on the training itself without worrying about stability issues.
[0045] The fitness bench according to an embodiment of the present invention includes a backrest angle adjustment structure according to an embodiment of the present invention. By integrating the backrest angle adjustment structure, not only is the functionality and practicality of the fitness bench improved, but the user experience is also significantly enhanced, enabling the fitness bench to better adapt to the body types and training needs of different users, providing a more comfortable, safe, and efficient fitness environment.
[0046] Other components and operations of the fitness bench according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.
[0047] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.
Claims
1. A back pad angle adjustment structure characterized by, The utility model relates to a backrest angle adjusting structure of a chair, which comprises: a base frame; a seat cushion for sitting on hips, which is arranged on the base frame to slide in a linear direction; a backrest cushion for supporting back, one end of which is rotatably connected with the seat cushion, and the other end of which is connected with the base frame through a connecting rod mechanism; when the seat cushion slides, the backrest cushion rotates around the rotation axis connected with the seat cushion to steplessly adjust the inclination angle of the backrest cushion and the seat cushion.
2. The back pad angle adjustment structure according to claim 1, characterized by: The base frame is provided with a stop component for locking the seat cushion.
3. The back pad angle adjustment structure according to claim 2, characterized by: The stop component comprises an operating rod and a floating part, the floating part is floatingly installed on the seat cushion in a vertical direction and can be disconnected with the base frame, and the operating rod is rotatably installed on the seat cushion, the operating rod is connected with and drives the floating part to move downward to be pressed and fixed with the base frame.
4. The back pad angle adjustment structure according to claim 3, characterized by: One end of the base frame is slidingly connected with a sliding frame, the seat cushion is fixedly connected with the sliding frame, the floating part comprises a stop block, a floating shaft and a compression spring, the sliding frame is fixedly connected with a first fixed block, the stop block is fixedly connected with a second fixed block, the floating shaft is penetratingly arranged in the first fixed block and the second fixed block in a vertical direction, and the compression spring is sleeved on the floating shaft, and two ends of the compression spring are respectively pressed and matched with the first fixed block and the second fixed block.
5. The back pad angle adjustment structure according to claim 4, characterized by: The second fixed block has a plurality of second fixed blocks, and the plurality of second fixed blocks are arranged around the stop block, the floating shaft, the compression spring and the first fixed block are all a plurality of and are arranged one by one corresponding to the second fixed block.
6. The back pad angle adjustment structure according to claim 4, characterized by: The operating rod is fixedly connected with a pressing plate and is used for driving the pressing plate to rotate, the pressing plate is a concave structure, the stop block is provided with an inclined surface and a stop surface which are connected in sequence at the matching position of the stop block and the pressing plate, and when the pressing plate presses the stop block downward, the pressing plate presses the inclined surface and the stop surface in sequence.
7. The back pad angle adjustment structure according to claim 4, characterized by: A stop sheet is installed on the lower wall of the stop block, and the stop sheet is a silica gel piece.
8. The back pad angle adjustment structure according to claim 1, characterized by: The seat cushion is provided with a plurality of rollers, and the seat cushion and the base frame are slidingly matched through the rollers.
9. The back pad angle adjustment structure according to claim 4, characterized by: The other end of the base frame is provided with a follower frame, the backrest cushion is fixedly connected with the follower frame, the connecting rod mechanism comprises a first connecting rod, one end of the follower frame is hinged with the sliding frame, one end of the first connecting rod is hinged with the base frame, and the other end of the first connecting rod is hinged with one end of the follower frame away from the sliding frame.
10. An exercise bench characterized by: The utility model relates to a backrest angle adjusting structure of a chair, which comprises: a backrest angle adjusting structure as claimed in any one of claims 1 to 9.