Office Chair Decline
The root cause of an office chair's decline usually lies in the failure of the gas lift (gas spring), specifically manifested as wear on the internal sealing ring, leakage of high-pressure gas, or abnormalities in the mechanical structure, resulting in a loss of locking force.
Common Cause Analysis
Aging and Pressure Loss of the Gas Lift Rod After prolonged use, the internal sealing ring of the gas lift rod gradually loses its elasticity due to material aging, leading to slow leakage of high-pressure gas (such as nitrogen). At this point, the locking ability weakens, causing the chair to slowly descend after adjusting the height, with the rate of decline increasing with body weight.
Wear or Leakage of the Sealing Ring Dust, moisture, or aged lubricant infiltrating the interior of the gas lift rod can damage the sealing performance. Even if there is no significant loss of gas, minor leaks may prevent the valve from closing completely, causing the chair to continuously sink when not in use.
Issues with the Adjustment Lever or Mechanical Structure If the metal lever connecting the adjustment handle to the gas lift rod is misaligned, the screws are loose, or the plastic parts are worn, it may continuously press the plunger, keeping the valve in a semi-open state. In this case, the chair will slowly descend due to the inability to maintain air pressure.
Poor Quality of the Gas Lift Gas lifts used in low-priced products may have issues such as insufficient nitrogen purity, overly thin cylinder walls (e.g., less than 2mm), or substandard material and workmanship. These gas lifts have unreliable initial performance and are prone to leakage after a period of use, causing the chair to decline.
Deformation of the Base Mechanism Prolonged overloading or violent impacts to the chair may cause slight deformation of the base steel plate. This deformation can interfere with the normal operation of the gas lift rod, preventing it from stably supporting the seat height.
Self-Inspection and Maintenance Recommendations
- Press Test: Quickly press down on the seat with your hand. If you feel like you are sitting directly on the base without any rebound, there may be a gas leakage issue.
- Sit and Listen: After sitting on the chair and remaining still, if you hear a hissing sound, it indicates that gas is leaking.
- Observe Behavior: Check if the chair automatically sinks without being adjusted or if it appears noticeably tilted.
- Maintenance Method: If it is confirmed that the gas lift rod is damaged, replace it with a qualified new one (prioritize products with SGS, TUV certifications, or that comply with the GB/T 2280-2016 standard), and avoid disassembling high-pressure sealing components yourself.
Safety Tip: Poor-quality gas lifts pose a risk of explosion. If the chair declinesๆ ๆ (without reason), stop using it immediately and take action to prevent accidents.
