Office Chair Bearing Positions

The bearing positions of office chairs are mainly distributed in the following areas:

1. Between the base and the casters
   This is the most fundamental bearing position of an office chair, typically located at the connection between the chair legs (five-pronged or three-pronged structure) and the casters. The bearing supports the casters through a rotating mechanism, enabling the chair to move flexibly. Its core function is to reduce friction, ensuring smooth and stable rolling of the casters while distributing the pressure from the chair legs on the ground, thereby extending the lifespan of the casters.

2. At the connection between the left and right sides of the seat and the base
   The bearings on both sides of the seat are used to connect the seat to the base, often featuring a hidden design. These bearings need to withstand the lateral pressure when a person is seated and allow the seat to tilt slightly within a certain angle range to enhance comfort. They are usually made of high-strength alloys or engineering plastics to ensure structural stability and wear resistance.

3. At the connection between the backrest and the seat
   The connection area between the backrest and the seat is a key load-bearing part, where the bearing plays a role in adjusting the angle of the backrest. For example, in an office chair that can recline, this bearing enables the联动 (simultaneous movement) of the backrest and the seat, allowing users to adjust the tilt angle according to their needs. Such bearings need to have high precision and fatigue resistance to cope with frequent angle changes.

4. Between the backrest and the support bracket
   The bearing of the backrest bracket is located at the connection point between the backrest and the metal or plastic bracket, mainly functioning to support the backrest and transfer the pressure when a person leans back. Some high-end office chairs adopt a dual-bearing design in this area to distribute pressure and enhance stability, preventing looseness or abnormal noises after long-term use.

5. Inside the gas lift column and the casters

   • Gas lift column bearing: The sliding sealed bearing inside the gas lift column is the core component for adjusting the chair's height. It reduces gas leakage through a precise sealing structure, ensuring smooth lifting and lowering. Its material needs to be high-pressure resistant and corrosion-resistant to adapt to the high-pressure environment inside the gas lift column.
   • Caster ball bearings: Each caster has small ball bearings embedded inside, which significantly reduce moving resistance by replacing sliding friction with rolling friction. These bearings need to be cleaned regularly to prevent dust or hair from getting stuck and causing poor rotation.

Summary: The bearing design of office chairs covers four major functions: mobility, load-bearing, angle adjustment, and height adjustment. Bearings in different positions, through material and structural optimization, jointly ensure the stability, durability, and comfort of the chair. During daily use, avoid overloading or violent shaking to extend the lifespan of the bearings.