Office Chair Rebound

The rebound characteristics of office chairs are related to multiple factors. A normal sinking of 1 - 2 centimeters is a functional buffer, while abnormal sinking or weak rebound may indicate a malfunction.

Normal Rebound Conditions

For office chairs equipped with gas cylinders, the rebound principle is based on the high-pressure nitrogen inside. When a person sits down and applies pressure, the lifting shaft gently compresses the high-pressure nitrogen inside, causing the chair to sink. The “1 - 2 centimeter slight sinking” is a reasonable manifestation of this elastic design and belongs to functional buffering. This design prevents the user from feeling uncomfortable due to a sudden sinking when sitting down. When the user stands up and removes the external force, the nitrogen pressure pushes the lifting shaft back, completing the rebound process.

The filling material of the office chair also affects the rebound effect. Take high-elastic foam sponge as an example. Its cell structure is more uniform, and the open-cell rate is higher. When compressed, air can be quickly expelled; when the pressure is released, it can quickly rebound and return to its original shape, effectively reducing the problem of sagging after long-term use. The polyether polyol used in high-rebound sponge generally adopts EO end-capping, producing sponge with a high open-cell rate. When compressed, it generates rebound forces with different supporting strengths under different deformation states, making it an ideal material for high-end office chairs.

Abnormal Rebound Conditions

If an office chair sinks to the lowest point as soon as one sits on it, slowly and continuously descends, has weak rebound, or is accompanied by abnormal noises, these are signs of a malfunction. There can be multiple possible causes. A poorly sealed gas cylinder can lead to nitrogen leakage inside, preventing the chair from rebounding normally. Insufficient hydraulic oil or internal blockages can affect the normal operation of the gas cylinder, thereby impacting the chair's rebound performance. Damage to the control and adjustment mechanism can cause the chair's lifting and rebound functions to go out of control. Aging and wear of components, such as the lifting shaft and seals after long-term use, can also affect the chair's rebound effect. Long-term overloading beyond the chair's designed load-bearing capacity can accelerate component damage, leading to abnormal rebound. Harsh environments, such as humidity and high temperatures, can corrode the chair's components and affect their performance.