Office Chair Rotation and Movement

The walking and rotation functions of an office chair are mainly achieved through its structural design, with the specific principles as follows:

Mechanism for Achieving Rotation Function

The rotation function of an office chair is realized through the bearing structure of the base, with common designs including integrated base bearing structures and split-type rotating disk structures.

• Integrated base bearing structure: By embedding ball bearings or sliding friction bearings into the base, the friction during rotation is reduced using the principles of rolling or sliding. Ball bearings disperse pressure through the rolling of steel balls, allowing the seat surface to rotate smoothly around the central axis; sliding friction bearings achieve rotation through the low-friction properties of special materials (such as polytetrafluoroethylene). This design is compact and suitable for lightweight office chairs.
• Split-type rotating disk structure: An independent rotating tray is installed between the base and the five-star foot, with rotation achieved through wear-resistant gaskets or steel balls inside the tray. Since the tray is separated from the five-star foot, it has stronger load-bearing capacity and is suitable for heavy users or scenarios that require frequent rotation (such as conference chairs). Some high-end models also add dust covers at the edges of the tray to reduce dust from entering the bearing interior.

Mechanism for Achieving Walking Function

The walking function relies on the combined design of the five-star foot and casters:

• Five-star foot: Usually made of aluminum alloy or nylon, it has five legs arranged in a star shape to ensure the stability of the chair during movement. Its angle design needs to conform to ergonomics to avoid tipping due to a shift in the center of gravity.
• Casters: The core components are the hub and the wheel surface. The hub has embedded bearings (such as double ball bearings), and the wheel surface is made of polyurethane or rubber materials, balancing wear resistance and quietness. The casters are designed to rotate 360 degrees, allowing the chair to change direction flexibly without the user having to get up and adjust their position. Some casters are also equipped with brake devices, which control the chair's fixation or movement through stepping.

Common Faults and Maintenance

If an office chair experiences stuttering or不顺滑 rotation (here '不顺滑' is translated as 'unsmooth' in the context, but kept as description for understanding the original meaning which implies difficulty in rotation), the following reasons may be the cause:

• Bearing dust ingress: Dust entering the bearing interior can hinder the movement of the balls or sliding surfaces. It is necessary to clean the bearing gaps with a soft-bristled brush or disassemble the base and blow out the dust with compressed air.
• Insufficient lubrication: After long-term use, the lubricating oil may evaporate or deteriorate. A small amount of silicone-based lubricating oil should be applied to the bearing contact surfaces (avoid using grease-based lubricants as they easily attract dust).
• Caster jamming: Check if the wheel surface is stuck with foreign objects or if the hub bearings are rusty. The casters can be disassembled and cleaned, or replaced with new ones (it is recommended to choose models with sealing rings for better dust prevention).

Regular cleaning and lubrication can significantly extend the service life of an office chair and maintain the smoothness of its walking and rotation functions.