Automatic reset swing arm mechanism and table and chair structure
By combining the synergistic effect of spring torsion energy storage and damper buffering, along with the limit structure and bearing design, the high energy consumption and unstable reset of the swivel chair swing arm mechanism are solved, achieving smooth reset and structural durability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU HUIHONG TEACHING EQUIP MFG CO LTD
- Filing Date
- 2025-05-14
- Publication Date
- 2026-04-17
AI Technical Summary
The existing swing arm mechanism of the swivel chair has high energy consumption, complex structure and is prone to overshoot or vibration due to inertia, lacks damping and buffering, and affects stability.
By employing the synergistic effect of spring torsion energy storage and damper buffering, the rotation angle is precisely limited through the limiting structure. Combined with the bearing and bushing design, the force transmission path is optimized, friction loss is reduced, and smooth reset is ensured.
This design enables the support arm to smoothly return to its original position after the external force is removed, avoiding impact caused by excessively rapid return, extending the lifespan of the table and chair structure, and improving stability and durability.
Smart Images
Figure CN224125518U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of table and chair structure technology, specifically to an automatic reset swing arm mechanism and a table and chair structure. Background Technology
[0002] Swivel chairs on the market can be raised, lowered, and rotated, making them simple and easy to use, suitable for use in bars, offices, schools, homes, and other places. Although they have both raising and rotating functions, and the seat of a swivel chair can rotate freely 360° relative to the legs, which is very convenient, when the person leaves after rotating, the seat remains in the position after the rotation is completed. This means that chairs with backrests will not automatically return to the set position (or automatically return to center) after returning to their original position.
[0003] Existing swivel chairs and tables often use a swing arm mechanism for resetting after connection. However, the swing arm mechanism mostly uses a motor or electromagnetic drive to achieve resetting, which has problems such as high energy consumption, complex structure, and high failure rate. Some mechanical resetting mechanisms store energy through torsion springs, but lack damping buffer, which can easily cause resetting overshoot or jitter due to inertia, affecting stability. Utility Model Content
[0004] The purpose of this utility model is to provide an automatic reset swing arm mechanism that addresses the shortcomings of existing technologies and solves the problems mentioned in the background.
[0005] The technical solution of this utility model is implemented as follows:
[0006] The utility model provides an automatic reset swing arm machine, including a mounting base and a support arm. The mounting base has an assembly port on its side wall, and a rotating cylinder is installed in the assembly port. One end of the support arm is connected to the outer wall of the rotating cylinder. A reset structure is installed in the assembly port and is connected to the rotating cylinder in a transmission manner. The reset structure is used to adjust the rotation of the rotating cylinder relative to the mounting base. A limiting structure is installed in the mounting base to limit the rotation angle of the rotating cylinder.
[0007] In some technical solutions of this utility model, the reset structure includes a fixed shaft installed inside a rotating cylinder, both ends of the fixed shaft being rotatably disposed in the mounting port, a damper being installed on one side of the fixed shaft, a torsion structure connected to the fixed shaft being installed inside the rotating cylinder, the damper being connected to the mounting base, and a rotation structure connected to the mounting base being installed on the other side of the fixed shaft.
[0008] In some technical solutions of this utility model, the rotating structure includes a bearing sleeved on the outer wall of the fixed shaft, and the outer ring of the bearing is connected to the inner wall of the rotating cylinder.
[0009] In some technical solutions of this utility model, a first bushing is installed on the outer side wall of the mounting base, the first bushing is embedded in the gap between the mounting base and the fixed shaft, and the inner ring of the bearing is installed on the outer side wall of the first bushing.
[0010] In some technical solutions of this utility model, the limiting structure includes a limiting plate installed on the side of the fixed shaft away from the damper. An arc-shaped notch is provided on the outer side wall of the limiting plate. A blocking plate is installed on the side wall of the mounting base, and a portion of the blocking plate is embedded in the arc-shaped notch.
[0011] In some technical solutions of this utility model, the torsion structure includes a spring sleeved on the outer wall of the fixed shaft, a baffle connected to the spring installed on the outer wall of the fixed shaft, a fixed cover plate sleeved on the outer wall of the fixed shaft, the fixed cover plate being located between the damper and the spring, the other end of the spring being connected to the fixed cover plate, and the fixed cover plate being detachably connected to the mounting base.
[0012] In some technical solutions of this utility model, a second bushing connected to the fixed cover plate is installed on the outer side wall of the fixed shaft.
[0013] A table and chair structure includes an automatic reset swing arm mechanism, a table body, and a chair body. The mounting base in the automatic reset swing arm mechanism is detachably connected to the table body. A mounting cylinder is installed on the support arm in the automatic reset swing arm mechanism, and the chair body is installed in the mounting cylinder.
[0014] Compared with existing technologies, this utility model has at least the following advantages or beneficial effects: Through the synergistic effect of spring torsional energy storage and damper buffering, the support arm can smoothly reset after the external force is removed; the spring stores elastic potential energy to provide reset power; the damper slows down the rotation speed, avoiding impact caused by excessively fast reset, ensuring smooth movement, and extending the life of the table and chair structure; the mechanical limiting design of the arc-shaped notch and the stop plate precisely limits the rotation angle of the support arm, preventing damage to the mechanism caused by excessive rotation. The limit plate and the fixed shaft are integrally formed, with a simple and reliable structure, ensuring safe operation; the split reset structure, composed of the fixed shaft, damper, and torsional spring, optimizes the force transmission path, reduces stress concentration, and improves component durability; the bearing and bushing fit together: the bearing reduces rotational friction loss, and the first bushing and second bushing enhance axial stability, prevent displacement, and improve energy transmission efficiency. Attached Figure Description
[0015] Figure 1 This is a structural diagram showing the installation of the automatic reset swing arm mechanism and the table and chair structure in this utility model.
[0016] Figure 2 This is a three-dimensional structural schematic of the automatic reset swing arm mechanism in this utility model.
[0017] Figure 3This is a first-view perspective three-dimensional structural diagram of the mounting base in this utility model.
[0018] Figure 4 This is a second-view perspective three-dimensional structural diagram of the mounting base in this utility model.
[0019] Figure 5 This is a schematic diagram of the internal structure of the mounting base in this utility model.
[0020] Reference numerals in the attached drawings: 1. Chair body; 2. Table body; 3. Mounting cylinder; 4. Support arm; 5. Rotating cylinder; 6. Mounting base; 7. Fixed shaft; 8. Limiting plate; 9. Bearing; 10. First bushing; 11. Spring; 12. Baffle; 13. Second bushing; 14. Damper; 15. Fixed cover plate; 16. Stop plate. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0022] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.
[0023] Example
[0024] This utility model provides an automatic reset swing arm mechanism, such as Figures 1-5As shown, the mounting base 6 includes a profile structure with an assembly opening on its side wall. The assembly opening is pre-positioned in the middle of the mounting base 6, and both sides of the mounting base 6 have chamber structures. Each of the two chamber structures has a cover for sealing the chamber structure, which is connected to the assembly opening via a shaft hole. A rotating cylinder 5 is installed inside the assembly opening, and the length of the rotating cylinder 5 is equal to that of the assembly opening. One end of the support arm 4 is integrally formed with the outer wall of the rotating cylinder 5 by welding. A reset structure is installed inside the assembly opening, and the reset structure is connected to the rotating cylinder 5 for adjusting the rotation of the rotating cylinder 5 relative to the mounting base 6. A limiting structure is installed inside the mounting base 6 to limit the rotation angle of the rotating cylinder 5. One end of the support arm 4 is connected to the rotating cylinder 5, which is installed in the assembly opening of the mounting base 6. The reset structure adjusts the rotation of the rotating cylinder 5, while the limiting structure limits the rotation angle. Thus, the support arm 4 should be able to rotate around the rotating cylinder 5, but the angle is limited by the limiting structure, and the reset structure allows it to automatically return to its original position. In some technical solutions of this utility model, the reset structure includes a fixed shaft 7 installed inside the rotating cylinder 5. The fixed shaft 7 is made of high-strength steel, and both ends of the fixed shaft 7 are rotatably disposed in the mounting ports. A portion of the fixed shaft 7 is placed inside the shaft hole. A damper 14 is installed on one side of the fixed shaft 7, which provides resistance. A torsion structure connected to the fixed shaft 7 is installed inside the rotating cylinder 5. The torsion structure stores elastic potential energy. The damper 14 is connected to the mounting base 6. A rotation structure connected to the mounting base 6 is installed on the other side of the fixed shaft 7. By designing the fixed shaft 7, damper 14, and rotation structure separately, the force transmission path is optimized. When the external force is suddenly removed, the rotation structure allows the rotating cylinder 5 to slowly reset, and the damper 14 slows down the movement speed, preventing sudden reset and damage to the table and chair structure from high-intensity impact.
[0025] In some technical solutions of this utility model, the rotating structure includes a bearing 9 sleeved on the outer wall of the fixed shaft 7, and the outer ring of the bearing 9 is connected to the inner wall of the rotating cylinder 5. The bearing 9 reduces frictional loss between the rotating cylinder 5 and the fixed shaft 7, and improves energy transfer efficiency.
[0026] In some technical solutions of this utility model, a first bushing 10 is installed on the outer wall of the mounting base 6. The first bushing 10 is embedded in the gap between the mounting base 6 and the fixed shaft 7. The inner ring of the bearing 9 is installed on the outer wall of the first bushing 10, which can ensure the correct installation of the bearing 9. Furthermore, the first bushing 10 ensures a tight fit between the inner ring of the bearing 9 and the fixed shaft 7, preventing axial displacement.
[0027] In some technical solutions of this utility model, the limiting structure includes a limiting plate 8 installed on the side of the fixed shaft 7 away from the damper 14. The limiting plate 8 is integrally formed with the fixed shaft 7 and is disc-shaped. It is located inside the cavity structure. A 90-degree arc-shaped notch is opened on the outer wall of the limiting plate 8. An arc-shaped blocking plate 16 is installed on the side wall of the mounting base 6. The blocking plate 16 is integrally formed with the mounting base 6 and is machined on the mounting base 16. Part of the blocking plate 16 is embedded in the arc-shaped notch. The mechanical limiting method of the arc-shaped notch and the blocking plate 16 is simple and reliable, and the angle limitation is precise. When the rotating cylinder 5 rotates, the limiting plate 8 rotates accordingly. When the edge of the arc-shaped notch touches the blocking plate 16, it prevents further rotation, thereby limiting the angle and preventing the support arm 4 from rotating beyond the safe range, thus protecting the normal operation of the mechanism.
[0028] In some technical solutions of this utility model, the torsion structure includes a spring 11 sleeved on the outer wall of the fixed shaft 7. A baffle 12 connected to the spring 11 is installed on the outer wall of the fixed shaft 7. The fixed shaft 7 extends outward through a shaft hole opened in the baffle 12, and the baffle 12 is connected to the inner wall of the rotating cylinder 5 by welding. A fixed cover plate 15 is sleeved on the outer wall of the fixed shaft 7. The fixed cover plate 15 is located between the damper 14 and the spring 11. The other end of the spring 11 is connected to the fixed cover plate 15. The fixed cover plate 15 is detachably connected to the mounting base 6. When the support arm 4 rotates, the spring 11 is compressed or torsioned on the fixed shaft 7. The spring 11 and the baffle 12 cooperate to achieve linear energy storage, forming torsional kinetic energy. After release, the spring 11 releases energy to reset the rotating cylinder 5. The fixed cover plate 15 may fix the position of the spring 11 to prevent the spring 11 from dislodging. The detachable connection between the two facilitates maintenance.
[0029] The fixed cover plate 15 and the mounting base 6 are detachably connected by bolts.
[0030] In some technical solutions of this utility model, a second bushing 13 connected to the fixed cover plate 15 is installed on the outer wall of the fixed shaft 7. The second bushing 13 enhances the stability of the fixed cover plate 15 and prevents the structure from loosening due to the return of the spring 11.
[0031] A table and chair structure includes an automatic reset swing arm mechanism, a table body 2, and a chair body 1. A mounting base 6 within the automatic reset swing arm mechanism is detachably connected to the table body 2. A mounting cylinder 3 is mounted on the support arm 4 within the automatic reset swing arm mechanism, and the chair body 1 is installed within the mounting cylinder 3. The automatic reset swing arm mechanism, applied to a table and chair structure, with the mounting base 6 positioned between the table and chair, allows the chair to swing and automatically reset after use, making it suitable for public spaces such as offices or schools.
[0032] The working principle of the automatic reset swing arm mechanism installed on the table body 2: When the support arm 4 is in the neutral position (initial state), the spring 11 is not stored in energy, and the damper 14 is in a stationary state, when an external force (such as when the user moves the chair) is applied to the support arm 4, the support arm 4 drives the rotating cylinder 5 to rotate around the fixed shaft 7. The rotation of the rotating cylinder 5 is transmitted to the fixed shaft 7 through the bearing 9. The spring 11 is compressed or twisted, storing elastic potential energy. The damper 14 generates resistance at the same time, slowing down the rotation speed and preventing the movement from being too fast. The rotating cylinder 5 drives the limit plate 8 to rotate. The edge of the arc-shaped notch contacts the stop plate 16, preventing the support arm 4 from continuing to rotate and ensuring that the angle is within a safe range. After the external force disappears, the spring 11 releases energy, drives the fixed shaft 7 to rotate in the opposite direction, drives the support arm 4 to reset, and the damper 14 buffers the reset speed. The support arm 4 smoothly returns to the initial position.
[0033] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. An automatic return swing arm mechanism characterized by, The device includes a mounting base (6) and a support arm (4). The mounting base (6) has an assembly opening on its side wall, and a rotating cylinder (5) is installed in the assembly opening. One end of the support arm (4) is connected to the outer wall of the rotating cylinder (5). A reset structure is installed in the assembly opening. The reset structure is connected to the rotating cylinder (5) in a transmission manner. The reset structure is used to adjust the rotation of the rotating cylinder (5) relative to the mounting base (6). A limiting structure is installed in the mounting base (6) to limit the rotation angle of the rotating cylinder (5).
2. An automatic return swing arm mechanism according to claim 1, wherein The reset structure includes a fixed shaft (7) installed inside the rotating cylinder (5). Both ends of the fixed shaft (7) are rotatably disposed in the mounting port. A damper (14) is installed on one side of the fixed shaft (7). A torsion structure connected to the fixed shaft (7) is installed inside the rotating cylinder (5). The damper (14) is connected to the mounting base (6). A rotation structure connected to the mounting base (6) is installed on the other side of the fixed shaft (7).
3. An automatic return swing arm mechanism according to claim 2, wherein The rotating structure includes a bearing (9) sleeved on the outer wall of the fixed shaft (7), and the outer ring of the bearing (9) is connected to the inner wall of the rotating cylinder (5).
4. An automatic return swing arm mechanism according to claim 3, wherein A first bushing (10) is installed on the outer side wall of the mounting base (6). The first bushing (10) is embedded in the gap between the mounting base (6) and the fixed shaft (7). The inner ring of the bearing (9) is installed on the outer side wall of the first bushing (10).
5. An auto-return swing arm mechanism according to any one of claims 2 to 4, wherein, The limiting structure includes a limiting plate (8) installed on the side of the fixed shaft (7) away from the damper (14). An arc-shaped notch is provided on the outer side wall of the limiting plate (8). A blocking plate (16) is installed on the side wall of the mounting base (6). A portion of the blocking plate (16) is embedded in the arc-shaped notch.
6. An automatic return swing arm mechanism according to claim 2, wherein The torsion structure includes a spring (11) sleeved on the outer wall of the fixed shaft (7), a baffle (12) connected to the spring (11) is installed on the outer wall of the fixed shaft (7), a fixed cover plate (15) is sleeved on the outer wall of the fixed shaft (7), the fixed cover plate (15) is located between the damper (14) and the spring (11), the other end of the spring (11) is connected to the fixed cover plate (15), and the fixed cover plate (15) is detachably connected to the mounting base (6).
7. An automatic return swing arm mechanism according to claim 6, wherein A second bushing (13) connected to the fixed cover plate (15) is installed on the outer side wall of the fixed shaft (7).
8. A table and chair structure, characterized in that, Includes an automatic reset swing arm mechanism as described in any one of claims 1-7, a table body (2), and a chair body (1), wherein the mounting base (6) in the automatic reset swing arm mechanism is detachably connected to the table body (2), and a mounting cylinder (3) is installed on the support arm (4) in the automatic reset swing arm mechanism, and the chair body (1) is installed in the mounting cylinder (3).