Office Chair Base Operation

The office chair base is the core support and adjustment mechanism of an office chair, primarily responsible for three major functions: horizontal rotation, recline adjustment, and height adjustment. The specific operation methods are as follows:

1. Horizontal Rotation
The base connects to the gas lift via a central bearing, allowing the seat (including the cushion and backrest) to rotate 360 degrees horizontally around the axis of the gas lift. This function requires no additional operation; users can achieve flexible turning simply by rotating their bodies, making it suitable for scenarios such as retrieving items, communicating with people to the side or rear, or adjusting sitting posture direction. During rotation, the bearing structure of the base ensures smooth and noiseless turning, and some high-end bases are equipped with damping designs to prevent imbalance caused by excessive rotation speed.

2. Recline Adjustment
The recline function is achieved through the mechanical structure of the base and includes three parts: unlocking/locking, tension adjustment, and angle locking:

• Unlocking and Locking: Most swivel chairs use an in-situ locking base, with the right-side handle controlling the backrest state. Pushing the handle to the left locks the backrest, maintaining a fixed angle; pulling the handle to the right unlocks it, allowing the backrest to move with the body as it reclines.
• Tension Adjustment: A cylindrical knob is usually located on the side of the base. Rotating it clockwise increases the rebound support force, suitable for users who are heavier or require strong support; rotating it counterclockwise decreases the tension, reducing recline resistance and suitable for users who are lighter or prefer a more relaxed recline. Some ergonomic chairs (such as the Dabaoli S20) place the tension adjustment knob under the cushion, operated via “+”/“-” markings, with the same logic.
• Angle Locking: Some ergonomic chairs (such as the Dabaoli S20) support multi-angle locking. Pulling the control lever on the right side of the cushion outward allows the backrest to recline freely to any angle; pushing the lever back locks it in the current position. To unlock, pull the lever outward again and gently push the backrest, and the chair returns to an upright position.

3. Height Adjustment
The lower end of the base connects to the top of the gas lift piston rod via a central hole or sleeve, and the height adjustment function relies on the nitrogen pressure difference inside the gas lift. The common operation method is adjustment via the right-side control lever: After sitting down, pull the control lever upward to raise the seat; press down on the control lever with body weight to lower the seat. Some chairs require continuous pressure on the control lever to maintain the height adjustment state and automatically lock the height when released. During height adjustment, the sealing structure between the base and the gas lift ensures stable pressure, preventing sudden seat drops.