Reasons for Office Chair Descent
The main reasons for the descent of office chairs include the aging and pressure loss of the gas spring, wear and leakage of the sealing ring, abnormalities in the adjusting lever, deformation of the chassis mechanism, and poor sealing of the gas spring. The specific analysis is as follows:
The aging and pressure loss of the gas spring is one of the common causes. As the core component for the height adjustment of office chairs, the gas spring is a typical consumable. It achieves the lifting function through high-pressure gas (usually nitrogen) inside and relies on the sealing ring to maintain pressure stability. Long-term repeated lifting and lowering will cause the sealing ring to gradually age, resulting in the slow leakage of high-pressure gas and a weakening of the locking ability. This process is manifested as the chair slowly descending shortly after height adjustment, and the heavier the user's weight, the faster the descent speed. When the gas spring completely fails, the chair will be unable to fix its height, and such problems are particularly common in products that have been used for more than five years.
The leakage problem caused by the wear of the sealing ring is also crucial. The gas spring adopts a multi-layer sealing structure inside. If dust or moisture intrudes or the lubricating oil ages, it will directly damage the sealing performance. Even if there is no significant loss of gas, a small leakage may still cause the locking function to fail. Such faults usually cannot be solved by simple repairs and require the replacement of the entire gas spring assembly.
Abnormalities in the mechanical structure of the adjusting lever can also cause the chair to descend. If the metal lever connecting the adjusting handle and the gas spring is misaligned in installation, has loose screws, or has worn plastic parts, it may continuously press the pin, keeping the valve in a semi-open state. In this case, even if the adjusting handle is not operated, the chair will still slowly descend. Such mechanical faults are relatively easy to repair and can usually be solved by adjusting the position of the lever or replacing the worn parts.
Deformation of the chassis mechanism is another important่ฏฑๅ . Long-term overweight use (exceeding the chair's nominal load-bearing capacity) or the chair being subjected to a violent impact may cause slight deformation of the chassis steel plate. This deformation will disrupt the matching precision between the gas spring and the chassis, thereby triggering the phenomenon of the chair descending.
The essence of poor sealing of the gas spring is still the leakage of internal high-pressure nitrogen or the wear of the oil seal, which is a normal wear and tear during use. Such problems are similar in mechanism to the aging and pressure loss of the gas spring, but they emphasize more on sealing process defects or natural degradation after long-term use.
