A three-gear reclining adjustment seat chassis

Abstract

The utility model relates to a seat chassis technical field especially is a kind of three-gear tilt adjustment seat chassis, including bottom plate, it is characterized by: the first movable seat is equipped with in bottom plate below, the first movable seat center is equipped with conical tube fixed plate, connecting spinal canal is equipped with in conical tube fixed plate below, the first movable seat one end is connected with second movable seat, the first movable seat bottom side is equipped with elastic adjusting mechanism, the first movable seat inside side is equipped with tilt adjustment mechanism, the tilt adjustment mechanism includes adjusting plate, adjusting rod is installed in the adjusting plate, the utility model provides a kind of three-gear tilt adjustment seat chassis, realizes backrest multi-gear tilt angle adjustment and stable locking by reasonable mechanical layout and function module combination, integrated resilience degree adjusting function, improve comfort and adaptability;Tilt adjustment mechanism utilizes adjusting plate, adjusting rod etc. cooperate square pinhole to realize multi-gear switching and firm locking.

Description

Technical Field

[0001] This utility model relates to the field of seat chassis technology, and in particular to a three-position tilt-adjustable seat chassis. Background Technology

[0002] With the increasing amount of time spent sitting in modern office environments, people have higher and higher requirements for the comfort, ergonomic fit, and adjustment functions of office chairs. In particular, the reclining adjustment function of the chair back has become one of the important indicators for measuring the comfort and completeness of the chair. Traditional chair chassis usually only have a single fixed reclining angle or a simple stepless adjustment function, lacking clear multi-angle selection, making it difficult to meet the personalized needs of different users in different scenarios such as office, meeting, and rest. At the same time, most products cannot adjust the rebound force of the backrest, resulting in support that is too hard or too loose, affecting the user experience. In addition, some existing chair chassis with reclining function have insufficient stability of locking mechanism, which is prone to slipping or loosening under force, posing certain safety hazards. Moreover, the structure is complex and inconvenient to adjust, making it difficult to balance the ease of operation and structural reliability.

[0003] Chinese patent discloses a seat chassis (publication number: CN 206434077 U) including a movable seat back with a free end and a hinged end, a support rod base hinged to the hinged end, a base plate hinged to the free end and located outside the support rod base, and an end cap located outside the base plate. The base, base plate, and end cap are hinged by a hinge member. The chassis also includes a tilt forming device that causes the end cap to rotate around the hinge member and forms an angle between the end cap and the base plate. However, this seat chassis still has significant shortcomings in terms of multi-level precise adjustment of tilt angle, personalized adaptation of rebound force, and locking stability. Therefore, a three-level tilt adjustable seat chassis is needed. Utility Model Content

[0004] The purpose of this invention is to address the significant shortcomings of existing seat chassis in terms of precise multi-level tilt angle adjustment, personalized rebound force adaptation, and locking stability, and to propose a three-level tilt adjustable seat chassis.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: A three-position tilt-adjustable seat chassis, comprising a base plate, is characterized in that: a first movable seat is provided below the base plate, a conical tube fixing plate is provided at the center of the first movable seat, a connecting conical tube is provided below the conical tube fixing plate, a second movable seat is connected to one end of the first movable seat, a spring adjustment mechanism is provided on one side of the bottom of the first movable seat, and a tilt adjustment mechanism is provided on one side inside the first movable seat. The tilt adjustment mechanism includes an adjustment plate, an adjustment rod is installed inside the adjustment plate, one end of the adjustment rod passes through the base plate, the first movable seat, and the adjustment plate and cooperates with the first movable seat, a lifting torsion spring is installed on one side of the adjustment plate, and a control spring is provided on the other side, with a locking pin connected to one end of the control spring. By combining the tilt adjustment mechanism and the spring adjustment mechanism, the seat can not only adjust the tilt angle of the backrest but also simultaneously adjust the rebound force of the backrest, meeting the differentiated needs of different users for comfort and support. The design of the adjustment plate and adjustment rod provides a stable mechanical transmission basis for tilt angle adjustment, ensuring a smooth and reliable adjustment process. The combination structure of the control spring and locking pin realizes the mechanical locking function of the tilt angle, so that the seat can be firmly held at the selected angle, improving safety and stability. The overall structure integrates the adjustment function into the chassis through the combination of multiple movable seats and connecting parts, eliminating the need for additional complex external devices. The structure is compact and easy to assemble and maintain.

[0006] Preferably, the locking pin is composed of a cylindrical segment and a square locking segment. The cylindrical segment is associated with the control spring, and the square locking segment is provided with a welding plate. The segmented structure (cylindrical + square) design of the locking pin ensures effective cooperation with the spring for flexible extension and retraction, and achieves precise positioning and stable locking through cooperation with the square segment, thus improving locking reliability. The design of the square locking segment enhances anti-rotation capability, preventing the locking pin from rotating due to force during use, ensuring accurate pin hole alignment, and improving stability and durability during adjustment. The welding plate provides a structurally stable pin hole bearing platform, making the pin hole position precise and secure, which helps to achieve a clear three-level adjustment positioning function.

[0007] Preferably, the welding piece has a first-position pin hole, a second-position pin hole, and a third-position pin hole from top to bottom. Each of these three pin holes is associated with a locking pin and is a square slot. The three clearly defined pin hole positions allow users to intuitively select different backrest tilt angles, meeting diverse usage scenarios such as upright work or moderate reclining for rest. The combination of the square pin hole and the square locking section improves positioning accuracy and locking stability, avoiding the wobbling or misalignment problems that are common with traditional round holes, ensuring stable maintenance at each position. The integrated pin hole design simplifies the overall structural layout, making the position switching mechanism more centralized and concise, which is beneficial for operation and maintenance.

[0008] Preferably, a first screw is provided at the connection between the locking pin and the control spring, and a second screw is provided at the connection between the adjusting plate and the adjusting rod. Using screws to fix key connection points enhances the stability and durability of the structure, preventing loosening or misalignment after prolonged use. The screw connection method facilitates assembly and subsequent maintenance, which is beneficial for product quality control and ease of repair. Precise connection and fixing ensure smooth transmission of adjustment actions and effectiveness of the locking function, improving the overall user experience.

[0009] Preferably, a first rivet is provided at the connection between the center of the first movable seat and the center of the base plate, a second rivet is provided at the connection between the first movable seat and the second movable seat, and a third rivet is provided at the center of the second movable seat. The rivet connection has high strength and fatigue resistance, capable of withstanding repeated forces during seat tilt adjustment, ensuring the chassis remains undeformed and secure over long-term use. The rational arrangement of multiple rivets enhances the connection rigidity and overall stability between the various moving parts, making the adjustment process smoother and safer. The rivet connection method simplifies the assembly process while improving the overall integrity and durability of the structure, making it suitable for mass production and practical application environments.

[0010] Preferably, the elastic adjustment mechanism includes an adjusting nut, a bowl-shaped washer at the center of the inner wall of the adjusting nut, a compression spring at one end of the bowl-shaped washer, a spring sleeve on the outside of the compression spring, and a fixing screw above the base plate. One end of the fixing screw passes through the compression spring, the bowl-shaped washer, and the adjusting nut in sequence and is connected to the adjusting nut. The elastic adjustment mechanism is reasonably designed and compact, allowing users to easily adjust the support of the seat back according to their personal preferences, improving comfort. The combined use of the bowl-shaped washer and the compression spring optimizes the force transmission path, making the elastic adjustment more linear and stable, ensuring a natural transition between different settings. The spring sleeve provides protection, extends the service life of the compression spring, prevents dust or external interference, and ensures the long-term effectiveness of the elastic adjustment function. The connection structure between the fixing screw and the adjusting nut achieves precise mechanical control of the elastic adjustment function, eliminating the need for electronic components and ensuring simplicity and reliability.

[0011] The advantages of this utility model are: This utility model provides a three-position tilt-adjustable seat chassis. Through a reasonable mechanical structure layout and functional module combination, it achieves multi-position adjustment and stable locking of the seat back tilt angle, while also integrating the backrest rebound force adjustment function, significantly improving the comfort and usability of the seat. The tilt adjustment mechanism adopts a combination design of an adjustment plate, adjustment rod, lifting torsion spring, and control spring, along with locking pins and square pin holes for first, second, and third positions on the welding plate. This allows users to easily switch between multiple preset tilt angles according to their needs or usage scenarios, ensuring that each position is firmly locked to prevent accidental return or loosening during use, thus improving safety and ease of operation. The spring adjustment mechanism, through the synergistic action of the adjustment nut, cup-shaped washer, compression spring, and spring sleeve, allows users to independently adjust the backrest rebound force according to their personal weight, sitting posture, or usage preferences. The spring force provides a more personalized support feel, reducing fatigue from prolonged sitting. Furthermore, the chassis, through the combination of the first movable seat, the second movable seat, the cone tube fixing plate, and the connecting conical tube, forms a stable mechanical transmission structure. This is further reinforced by multiple rivet connections, ensuring the overall structure remains reliable and durable under frequent adjustments and heavy loads, preventing deformation or loosening. Key components such as the locking pins employ a segmented structure of cylindrical and square locking sections, working in conjunction with control springs to achieve flexible and precise extension and locking. The square pin holes on the welding plates further enhance the accuracy and durability of gear positioning. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the exploded structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the control and locking structure of this utility model.

[0015] Figure 3 This is a schematic diagram of the control and locking structure of this utility model from a low angle.

[0016] Figure 4 This is a top view schematic diagram of the control and locking structure of this utility model.

[0017] Figure 5 This is a schematic diagram of the control and unlocking structure of this utility model.

[0018] Figure 6 This is a schematic diagram of the control and unlocking structure of this utility model from a low angle.

[0019] Figure 7 This is a top view schematic diagram of the control and unlocking structure of this utility model.

[0020] Figure 8 This is a schematic diagram of the tilt control and locking structure of this utility model.

[0021] In the diagram: 1. Fixing screw; 2. Base plate; 3. Adjusting rod; 4. First stop pin hole; 5. Second stop pin hole; 6. Third stop pin hole; 7. Lifting torsion spring; 8. Second screw; 9. Adjusting plate; 10. Control spring; 11. First screw; 12. Cylindrical section; 13. Square locking section; 14. Second movable seat; 15. First movable seat; 16. Conical tube fixing plate; 17. Connecting conical tube; 18. Spring sleeve; 19. Compression spring; 20. Cup-shaped washer; 21. Adjusting nut; 22. First rivet; 23. Second rivet; 24. Third rivet. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. Example

[0023] Please see Figure 1-8 As shown, a three-position tilt-adjustable seat chassis includes a base plate 2. The base plate 2 has a first movable seat 15 below it, a conical tube fixing plate 16 at its center, a connecting conical tube 17 below the conical tube fixing plate 16, a second movable seat 14 connected to one end of the first movable seat 15, a spring adjustment mechanism on one side of the bottom of the first movable seat 15, and a tilt adjustment mechanism on one side inside the first movable seat 15. The tilt adjustment mechanism includes an adjustment plate 9, an adjustment rod 3 installed inside the adjustment plate 9, one end of the adjustment rod 3 passing through the base plate 2, the first movable seat 15, and the adjustment plate 9 and engaging with the first movable seat 15. A lifting torsion spring 7 is installed on one side of the adjustment plate 9, and a control spring 10 is installed on the other side. A locking pin is connected to one end of the control spring 10. By combining the tilt adjustment mechanism and the spring adjustment mechanism, the seat can not only adjust the tilt angle of the backrest but also simultaneously adjust the rebound force of the backrest, meeting the diverse comfort and support needs of different users. The coordinated design of the adjustment plate 9 and the adjustment rod 3 provides a stable mechanical transmission basis for the adjustment of the tilt angle, ensuring a smooth and reliable adjustment process. The combination structure of the control spring 10 and the locking pin realizes the mechanical locking function of the tilt angle, so that the seat can be firmly maintained at the selected angle, improving the safety and stability of use. The overall structure integrates the adjustment function into the chassis through the combination of multiple movable seats and connecting parts, eliminating the need for additional complex external devices. The structure is compact and easy to assemble and maintain.

[0024] In this embodiment, the locking pin is composed of a cylindrical section 12 and a square locking section 13. The cylindrical section 12 is associated with the control spring 10, and the square locking section 13 is provided with a welding plate. The segmented structure (cylindrical + square) design of the locking pin ensures effective cooperation with the spring for flexible extension and retraction, and achieves precise positioning and stable locking through cooperation with the square section, thus improving locking reliability. The design of the square locking section 13 enhances anti-rotation capability, preventing the locking pin from rotating due to force during use, ensuring accurate pin hole alignment, and improving stability and durability during adjustment. The welding plate provides a structurally stable pin hole bearing platform, making the pin hole position accurate and firm, which helps to achieve a clear three-level adjustment positioning function.

[0025] In this embodiment, the welding sheet is provided with a first stop pin hole 4, a second stop pin hole 5, and a third stop pin hole 6 from top to bottom. Each of these three pin holes is associated with a locking pin and is a square slot. The three clearly defined pin hole positions allow users to intuitively select different backrest tilt angles, meeting diverse usage scenarios such as upright work or moderate reclining for rest. The combination of the square pin holes and the square locking section 13 improves positioning accuracy and locking stability, avoiding the wobbling or misalignment problems that are common with traditional round holes, ensuring stable maintenance of each position. The integrated pin hole design of the welding sheet simplifies the overall structural layout, making the position switching mechanism more centralized and concise, which is beneficial for operation and maintenance.

[0026] In this embodiment, a first screw 11 is provided at the connection between the locking pin and the control spring 10, and a second screw 8 is provided at the connection between the adjusting plate 9 and the adjusting rod 3. Using screws to fix key connection points enhances the stability and durability of the structure, preventing loosening or misalignment after prolonged use. The screw connection method facilitates assembly and subsequent maintenance, which is beneficial for product quality control and ease of repair. Precise connection and fixing ensure smooth transmission of adjustment actions and the effectiveness of the locking function, improving the overall user experience.

[0027] In this embodiment, a first rivet 22 is provided at the connection between the center of the first movable seat 15 and the center of the base plate 2, a second rivet 23 is provided at the connection between the first movable seat 15 and the second movable seat 14, and a third rivet 24 is provided at the center of the second movable seat 14. The rivet connection has high strength and fatigue resistance, capable of withstanding repeated forces during seat tilt adjustment, ensuring the chassis remains undeformed and secure over long-term use. The rational arrangement of multiple rivets enhances the connection rigidity and overall stability between the various moving parts, making the adjustment process smoother and safer. The rivet connection method simplifies the assembly process while improving the overall integrity and durability of the structure, making it suitable for mass production and practical application environments.

[0028] In this embodiment, the elastic adjustment mechanism includes an adjusting nut 21. A bowl-shaped washer 20 is located at the center of the inner wall of the adjusting nut 21. A compression spring 19 is located at one end of the bowl-shaped washer 20. A spring sleeve 18 is located on the outer side of the compression spring 19. A fixing screw 1 is located above the base plate 2. One end of the fixing screw 1 passes sequentially through the compression spring 19, the bowl-shaped washer 20, and the adjusting nut 21 and connects to the adjusting nut 21. The elastic adjustment mechanism is reasonably designed and compact, allowing users to easily adjust the support strength of the seat back according to their personal preferences, improving comfort. The combined use of the bowl-shaped washer 20 and the compression spring 19 optimizes the force transmission path, making the elastic adjustment more linear and stable, ensuring a natural transition between different settings. The spring sleeve 18 provides protection, extending the service life of the compression spring 19, preventing dust or external interference, and ensuring the long-term effectiveness of the elastic adjustment function. Through the connection structure between the fixing screw 1 and the adjusting nut 21, precise mechanical control of the elastic adjustment function is achieved, eliminating the need for electronic components and ensuring simplicity and reliability.

[0029] The implementation principle of this embodiment is as follows: When the user applies a backward force (such as tilting the backrest), the entire first movable seat 15 rotates relative to the base plate 2 at a tilt angle. At this time, the adjusting plate 9 moves together with the first movable seat 15. During this process, the adjusting rod 3 inside the adjusting plate 9 maintains its relative position with the base plate 2 and the first movable seat 15, playing the role of structural support and motion guidance. At the same time, the lifting torsion spring 7 set on one side of the adjusting plate 9 generates elastic deformation, providing the user with a certain tilting assistance, making the backrest tilt more smoothly and naturally. During the tilting process, the control spring 10 pushes the locking pin to keep it in an outward extended state. When the first movable seat 15 drives the adjusting plate 9 to rotate to a preset tilt angle position (corresponding to the first, second, or third position pin hole 6 on the welding piece), the locking pin automatically engages in the corresponding square pin hole under the elastic force of the control spring 10, thereby locking the tilt angle and keeping the backrest stably at the angle selected by the user. The elastic adjustment mechanism is mainly used to adjust the rebound force of the seat back, that is, the support strength and return speed provided by the backrest when the user leans back. This mechanism mainly consists of an adjusting nut 21, a cup-shaped washer 20, a compression spring 19, a spring sleeve 18, and a fixing screw 1. The fixing screw 1 is fixed to the base plate 2, and the compression spring 19, cup-shaped washer 20, and adjusting nut 21 are sequentially threaded onto it. By rotating the adjusting nut 21, the user can change the relative position of the adjusting nut 21 and the fixing screw 1, thereby compressing or releasing the compression spring 19. When the compression spring 19 is further compressed, its elastic force increases, causing the lifting torsion spring 7 or other elastic components to tilt... The increased reverse force during the process makes the resistance that the backrest needs to overcome when it rebounds greater, resulting in a "firmer" backrest and more stable support. Conversely, when the compression spring 19 is released and the compression amount decreases, the rebound force decreases, the backrest is easier to lean back and the rebound feeling is softer. Users can adjust the elasticity continuously or in stages by turning the adjusting nut 21 according to their own weight, sitting habits and support needs, thereby obtaining a personalized comfort experience. The spring sleeve 18 wraps around the compression spring 19, playing a protective and guiding role, preventing the compression spring 19 from being affected by external factors or from shifting laterally, and ensuring the accuracy and long-term effectiveness of the elasticity adjustment function.

[0030] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. 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.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A three-position tilt-adjustable seat chassis, comprising a base plate (2), characterized in that: The base plate (2) is provided with a first movable seat (15) below it. The center of the first movable seat (15) is provided with a conical tube fixing plate (16). The conical tube fixing plate (16) is provided with a connecting conical tube (17) below it. One end of the first movable seat (15) is connected to a second movable seat (14). The bottom side of the first movable seat (15) is provided with an elastic adjustment mechanism. The inside side of the first movable seat (15) is provided with a tilt adjustment mechanism. The tilt adjustment mechanism includes an adjustment plate (9). An adjustment rod (3) is installed inside the adjustment plate (9). One end of the adjustment rod (3) passes through the base plate (2), the first movable seat (15), and the adjustment plate (9) and cooperates with the first movable seat (15). A lifting torsion spring (7) is installed on one side of the adjustment plate (9), and a control spring (10) is provided on the other side. One end of the control spring (10) is connected to a locking pin.

2. A three-position tilt-adjustable seat chassis according to claim 1, characterized in that: The locking pin is composed of a cylindrical section (12) and a square locking section (13), the cylindrical section (12) being associated with a control spring (10), and the square locking section (13) having a welding plate.

3. A three-position tilt-adjustable seat chassis according to claim 1, characterized in that: The welding sheet is provided with a first stop pin hole (4), a second stop pin hole (5) and a third stop pin hole (6) from top to bottom. The first stop pin hole (4), the second stop pin hole (5) and the third stop pin hole (6) are all associated with and cooperate with the locking pin. The first stop pin hole (4), the second stop pin hole (5) and the third stop pin hole (6) are all square slot holes.

4. A three-position tilt-adjustable seat chassis according to claim 1, characterized in that: The locking pin is connected to the control spring (10) with a first screw (11), and the adjusting plate (9) is connected to the adjusting rod (3) with a second screw (8).

5. A three-position tilt-adjustable seat chassis according to claim 1, characterized in that: A first rivet (22) is provided at the connection between the center of the first movable seat (15) and the center of the base plate (2), a second rivet (23) is provided at the connection between the first movable seat (15) and the second movable seat (14), and a third rivet (24) is provided at the center of the second movable seat (14).

6. A three-position tilt-adjustable seat chassis according to claim 1, characterized in that: The elastic adjustment mechanism includes an adjusting nut (21), a bowl-shaped washer (20) is provided at the center of the inner wall of the adjusting nut (21), a compression spring (19) is provided at one end of the bowl-shaped washer (20), a spring sleeve (18) is provided on the outside of the compression spring (19), and a fixing screw (1) is provided above the base plate (2). One end of the fixing screw (1) passes through the compression spring (19), the bowl-shaped washer (20) and the adjusting nut (21) in sequence and is connected to the adjusting nut (21).

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