Functions of the Knob on Office Chairs

The knobs under office chairs typically serve functions such as adjusting backrest hardness or resistance, chair height, controlling the lifting and lowering buffer force, adjusting lumbar support intensity, and locking or unlocking the chair.

Adjusting backrest hardness or resistance: This is one of the most common functions of the knob on office chairs. By turning the knob clockwise, the chair backrest usually becomes harder or increases the resistance to leaning back, providing stronger support for users who need to maintain a fixed sitting posture for a long time or require strong back support. Conversely, turning it counterclockwise makes the backrest softer or reduces resistance, offering more flexible support for users who are lighter in weight or prefer flexible leaning back. For example, lighter individuals can turn the knob to the left to make leaning back easier, while heavier individuals can turn it to the right to prevent sudden lying down.

Adjusting chair height: Some office chairs adjust their height by rotating the rod up or down. Rotating the rod upward raises the chair, suitable for taller users or those who need to adjust their line of sight height. Rotating it downward lowers the chair, suitable for shorter users or those who need to lower their sitting posture. This function helps users find the most comfortable sitting posture and reduces fatigue from prolonged office work.

Controlling the lifting and lowering buffer force: In advanced ergonomic chairs, the knob can be linked to the gas lift to control the buffer force when the chair is lifted or lowered. By adjusting the knob, users can adjust the smoothness of the chair's lifting and lowering according to their needs, avoiding discomfort caused by lifting or lowering too quickly or slowly.

Adjusting lumbar support intensity: On some models of office chairs, rotating the knob can also synchronously adjust the intensity of lumbar support. This function helps users find the most suitable position for the lumbar support, ensuring that the support point precisely fits the most concave part of the lumbar spine, effectively relieving lumbar pressure and preventing lumbar diseases.

Locking or unlocking function: The knob or rod on some office chairs has a locking function. Pushing the rod inward locks the chair in its current state, preventing accidental movement or leaning back during use. Pulling it outward unlocks the chair, restoring its normal function. This function helps improve the safety and stability of the office chair.