Chair universal wheel axle

Abstract

The utility model relates to a universal wheel axle of a chair, which comprises a fixed connection section fixedly connected with a wheel carrier and connection sections positioned at two ends of the fixed connection section and used for being connected with rollers, a circle of arc-shaped groove is arranged on the outer ring of each connection section, and a vertical surface for limiting is arranged at the outer end of each arc-shaped groove. The arc-shaped groove is formed in the outer ring of the connecting section and can be tightly matched with the inner structure of the roller, the contact area and friction force between the wheel shaft and the roller are increased, the connecting stability is remarkably improved, the roller loosening and falling risk is reduced, and the service life of the chair is prolonged. Meanwhile, the vertical surfaces for limiting can precisely restrain the axial displacement of the rollers, prevent axial movement, avoid shaking and jamming of the chair, improve the smoothness and stability of movement of the chair and optimize the use experience of a user. The wheel shaft is simple in structure and easy to manufacture, the product performance is improved, meanwhile, the production cost is not greatly increased, and good economic benefits and market popularization value are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of universal wheel accessories, in particular to a chair universal wheel axle. BACKGROUND

[0002] In modern office and home environment, the chair equipped with universal wheels is widely used due to the flexible and convenient moving performance. The universal wheel axle as the core component connecting the wheel frame and the roller, its structure design directly affects the stability and safety of the chair. At present, the common chair universal wheel axle on the market adopts simple sleeve connection or key connection when connecting with the roller. This connection structure has the problem of insufficient connection stability. In the long-term use process, the roller is prone to looseness and falling due to external force impact, frequent turning and other factors, which not only reduces the service life of the chair, but also may cause safety hazards to the user. In addition, the existing axle structure lacks effective limiting design, and it is difficult to accurately constrain the axial displacement of the roller, resulting in shaking, jamming and other situations of the chair during movement, which affects the use experience. Therefore, it is urgent to develop a new type of chair universal wheel axle to solve the above problems in the prior art and improve the connection reliability and use safety of the universal wheel. SUMMARY

[0003] In view of the deficiencies in the background art, the utility model provides a chair universal wheel axle.

[0004] The technical scheme adopted by the utility model is: a chair universal wheel axle, which comprises a fixed connection section fixedly connected with a wheel frame and a connecting section located at both ends of the fixed connection section for connecting with a roller, an arc-shaped groove is arranged on the outer ring of the connecting section, and a vertical surface for limiting is arranged at the outer end of the arc-shaped groove.

[0005] Further, the radius of the arc-shaped groove is 4-5mm.

[0006] Further, the distance a between the vertical surface and the end surface of the adjacent connecting section is 1.5-2.5mm.

[0007] Further, a b chamfer is arranged between the vertical surface and the outer wall of the connecting section, and the radius of the b chamfer is 0.1-0.2mm.

[0008] Further, a c chamfer is arranged between the end surface of the connecting section and the outer wall of the connecting section, and the radius of the c chamfer is 1 / 3-1 / 4 of the radius of the connecting section.

[0009] Further, the height d of the vertical surface is 0.4-1mm.

[0010] The utility model has the advantages of:

[0011] 1. By setting an arc-shaped groove around the outer ring of the connecting section, it can interact with the internal boss structure of the roller (such as...). Figure 3 (As shown) This creates a tight fit, effectively increasing the contact area and friction between the axle and the roller, significantly improving the connection stability and tightness between the two, making it less prone to detachment. At the same time, it greatly reduces the risk of wear and tear on the boss structure compared to traditional socket or key connection methods, thus greatly reducing the risk of the roller loosening or falling off due to external impact or frequent turning, and extending the service life of the chair.

[0012] 2. The vertical limiting surface set at the outer end of the arc-shaped groove can precisely constrain the axial displacement of the roller, effectively preventing the roller from axially shifting during movement, avoiding wobbling or jamming of the chair, thereby improving the smoothness and stability of the chair's movement and optimizing the user experience.

[0013] 3. The arc-shaped groove allows for more grease to be accommodated between the groove and the internal boss structure of the roller, improving lubrication and service life.

[0014] 4. The arc-shaped groove design allows the groove and the boss structure to fit more closely to the running centerline of the groove during the dynamic rotation of the rollers, significantly enhancing the stability of the product's operation and avoiding shaking or jamming caused by deviation. This further optimizes the user experience of the chair, providing users with a smoother and more comfortable movement.

[0015] In addition to the objectives, features and advantages described above, this utility model has other objectives, features and advantages.

[0016] The present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a side view of the present invention.

[0019] Figure 3 This is a schematic diagram of the cross-section of the present invention connected to the roller.

[0020] Figures 1-3 In the middle: 1. Fixed section; 2. Connecting section; 3. Arc-shaped groove; 4. Vertical surface; 5. b. Rounded corner; 6. c. Rounded corner. Detailed Implementation

[0021] 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 protection scope of the present utility model.

[0022] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0023] This utility model provides a universal wheel axle for a chair.

[0024] In this embodiment, refer to Figures 1-3 The chair's universal wheel axle includes a fixed section 1 that is fixed to the wheel frame and connecting sections 2 located at both ends of the fixed section 1 for connecting to the rollers. The connecting section has an arc-shaped groove 3 on its outer ring, and the outer end of the arc-shaped groove 3 has a vertical surface 4 for limiting.

[0025] In the above technical solution, an arc-shaped groove and a vertical surface for limiting the outer end of the arc-shaped groove are provided on the outer ring of the connecting section. The arc-shaped groove can form a tight fit with the internal structure of the roller, increase the contact area and friction, improve the connection stability between the wheel axle and the roller, and reduce the risk of the roller loosening or falling off. The vertical surface can precisely constrain the axial displacement of the roller, prevent axial movement, ensure the smoothness and stability of the chair when moving, and optimize the user experience.

[0026] Specifically, the radius of the arc-shaped groove is 4-5 mm.

[0027] In this embodiment, the radius of the arc-shaped groove is 4-5mm. This size range ensures that the arc-shaped groove and the internal structure of the roller form sufficient contact area and friction, ensuring a stable connection and achieving a balance between connection stability and the strength of the wheel and axle structure.

[0028] Specifically, the distance 'a' between the vertical surface and the end face of its adjacent connecting segment is 1.5-2.5 mm.

[0029] In this embodiment, the distance 'a' between the vertical surface and the end face of its adjacent connecting section is 1.5-2.5mm. This distance setting allows the vertical surface to effectively limit the axial displacement of the roller while avoiding interference with other components due to excessively close distances, or unnecessary increases in shaft length due to excessively long distances.

[0030] Specifically, a rounded corner 5 (b) is provided between the vertical surface and the outer wall of the connecting section, and the radius of the rounded corner 5 (b) is 0.1-0.2 mm.

[0031] In this embodiment, the rounded corner design can effectively eliminate stress concentration, prevent the axle from cracking due to stress concentration during use, and improve the structural strength and service life of the axle; at the same time, the smaller rounded corner radius facilitates processing and manufacturing without affecting the limiting function.

[0032] Specifically, a c-shaped fillet 6 is provided between the end face of the connecting segment and the outer wall of the connecting segment, and the radius of the c-shaped fillet 6 is 1 / 3 to 1 / 4 of the radius of the connecting segment.

[0033] In this embodiment, the rounded corner design can reduce the sharp edges at the junction of the end face of the connecting section and the outer wall, reducing the risk of damage to other components during assembly or use. It also helps to disperse stress and enhance the overall strength and durability of the wheel axle.

[0034] Specifically, the height d of the vertical surface is 0.4-1mm.

[0035] In this embodiment, the height d of the vertical surface is 0.4-1mm. A suitable height can provide sufficient axial limiting support for the roller, ensuring effective constraint on the axial displacement of the roller and preventing wobbling or jamming when the chair moves. At the same time, this height range avoids increasing material costs and processing difficulty due to excessive height, or affecting the limiting effect due to excessive low height, thus achieving a balance between functionality and economy.

[0036] Attention all technical personnel: Although this utility model has been described according to the specific embodiments above, the concept of this utility model is not limited to this utility model. Any modification that utilizes the concept of this utility model will be included within the scope of protection of this patent right.

Claims

1. A chair caster axle, comprising a fixed section for being fixedly connected to a caster frame and connecting sections located at both ends of the fixed section for connecting to rollers, characterized in that: The connecting section has an arc-shaped groove on its outer ring, and the outer end of the arc-shaped groove has a vertical surface for limiting positioning.

2. The chair caster axle according to claim 1, characterized in that: The radius of the arc-shaped groove is 4-5 mm.

3. The chair caster axle according to claim 1, characterized in that: The distance 'a' between the vertical surface and the end face of its adjacent connecting segment is 1.5-2.5 mm.

4. The chair caster axle according to claim 1, characterized in that: A chamfered corner (b) is provided between the vertical surface and the outer wall of the connecting section, and the radius of the chamfered corner (b) is 0.1-0.2 mm.

5. The chair caster axle according to claim 1, characterized in that: A c-shaped fillet is provided between the end face of the connecting section and the outer wall of the connecting section, and the radius of the c-shaped fillet is 1 / 3 to 1 / 4 of the radius of the connecting section.

6. The chair caster axle according to claim 1, characterized in that: The height d of the vertical surface is 0.4-1mm.

Images