Office Chair Free Adjustment

The free adjustment function of the office chair is achieved through a chassis linkage structure, enabling the backrest to recline within a range of 15°–35° while accompanied by slight rocking for dynamic relaxation. The core purpose is to provide 'dynamic support' and 'micro-relaxation' rather than full reclining.

Functional Implementation Principle

The free adjustment function relies on a complete chassis linkage structure, with the core being the collaborative action of the chassis spring damping system and the rotating shaft. When the user leans back, the seat and backrest recline synchronously, forming a dynamically supported area with slight rocking within the set angle range. The recline angle can be adjusted and locked using the handle on the armrest, or infinite suspension can be achieved. The built-in damping spring automatically adjusts the rocking sensation according to the user's weight: lighter individuals experience less rocking to avoid excessive swinging, while heavier individuals receive sufficient support to ensure stability.

Ergonomic Advantages

1. Relieving Lumbar Pressure: Prolonged sitting keeps the spine fixed, continuously increasing pressure on the intervertebral discs. The free adjustment function naturally extends the lumbar curve through slight reclining, reducing intervertebral disc pressure by 20%–30% and alleviating stiffness and soreness in the lumbar muscles.
2. Promoting Lower Limb Blood Circulation: When reclining, the pelvis shifts backward and the knees lift slightly, improving venous return issues caused by prolonged sitting and reducing the risk of leg numbness and swelling.
3. Dynamically Stabilizing Core Muscles: Slight rocking activates the core muscles of the waist and abdomen for micro-adjustments, avoiding muscle strain caused by prolonged static exertion and providing better lumbar support than fixed chairs.
4. Brief Relaxation Without Interrupting Work: Without getting up or leaving the workstation, reclining for 10–15 seconds can quickly relieve tension in the shoulders, neck, waist, and back, making it suitable for micro-breaks during work.

Applicable Scenarios and Limitations

The free adjustment function is not suitable for high-precision, highly focused tasks (such as precision drawing, code debugging, financial reconciliation, etc.), as slight backrest rocking can cause visual deviation and operational errors, reducing efficiency and increasing error rates. Additionally, individuals prone to motion sickness or with sensitive constitutions may experience dizziness, nausea, and difficulty concentrating due to continuous rocking, making it difficult to focus on work.

In summary, the free adjustment function offers significant advantages in alleviating prolonged sitting fatigue through dynamic support and micro-relaxation design, but its use should be reasonably selected based on work type and individual constitution.