Office Chair Round Knob

The round knob under the office chair is mainly used to adjust the backrest elasticity, tilt angle, and in some advanced chairs, the protrusion level of the lumbar support.

I. Basic Adjustment Functions
The core function of the round knob on an office chair is to adjust the elasticity and tilt angle of the backrest. When a user turns the knob clockwise, the elasticity of the backrest increases, and the resistance to tilting becomes stronger, making it suitable for scenarios where a straight sitting posture needs to be maintained. When turned counterclockwise, the elasticity decreases, allowing the backrest to tilt backward more easily to meet relaxation needs. This design changes the tension of the internal springs or dampers in the backrest through mechanical structures, enabling personalized adjustment of support strength.

II. Dynamic Lumbar Support Adjustment (Advanced Function)
The knobs on some high-end office chairs (such as the Haibao P2Pro) feature three-dimensional lumbar support adjustment functions. By rotating or pushing the knob, users can control the up-down, front-back positions, and protrusion level of the lumbar support, achieving “dynamic support”. This design can automatically fit the curve of the waist according to changes in the user's sitting posture. Scientific research has shown that proper use of such lumbar supports can share 48% of the intervertebral disc load, significantly reducing lumbar spine pressure and preventing lumbar muscle strain caused by prolonged sitting.

III. Brand-Specific Designs
Different brands of chairs have made differentiated innovations in the functions of the knobs:

1. Ergohuman Gold豪b: The knob adopts a double-layer design, with the inner ring adjusting the height of the lumbar support and the outer ring controlling the elasticity of the backrest, achieving “one-knob dual control”;
2. NetEase Yanxuan Starship Pro: The knob integrates an intelligent sensing module that automatically identifies the user's weight upon sitting down and dynamically matches the elasticity of the backrest without the need for manual adjustment;
3. Some Ergonomic Chairs: The knob can lock the tilt angle of the backrest to prevent accidental backward tilting and enhance usage safety.

IV. Usage Recommendations
When adjusting, it is necessary to proceed step by step according to body weight and sitting habits: first adjust the position of the lumbar support to the depression of the waist, and then control the elasticity through the knob to a state where it can easily tilt backward without a feeling of falling. Regularly check the tightness of the knob to avoid support failure due to looseness. If the chair has not been used for a long time, it is recommended to readjust it to adapt to body changes.