Office Chair Leg Sinking

The sinking of an office chair leg usually indicates a malfunction in the chair, with possible causes and solutions as follows:

1. Gas Spring Failure
   The gas spring is the core component for adjusting the height of an office chair, using high-pressure nitrogen gas inside for support. If the seal ring ages or is damaged, nitrogen gas will gradually leak, resulting in insufficient support and the chair sinking. Solution: When replacing the gas spring, ensure the specifications match, selecting a product with the same diameter and length as the old one. Prioritize reputable brands that have passed safety certifications like BIFMA or SGS to avoid safety hazards caused by inferior parts.

2. Loose Connections
   The connecting screws between the base, gas rod, and seat may loosen due to prolonged use or frequent adjustments, reducing structural stability and preventing the chair from maintaining a fixed height. Solution: Flip the chair over and inspect all visible screws (including those at the connections between the base and gas rod, and between the seat and base). Tighten them one by one using tools. If screws are stripped or damaged, replace them with new ones.

3. Adjustment Lever Failure
   If the black tray (throttle) controlling the height adjustment loses its seal, the height-locking function will fail, and the chair will not stay at the set position. Solution: This issue usually requires replacing the internal seals of the tray or the entire gas spring. If the chair is still under warranty, contact the manufacturer for repairs. If the warranty has expired, you can purchase compatible parts for replacement or contact a professional repair service.

4. Simple Repair Attempt (Temporary Measure)
   If the sinking issue is caused by slow gas leakage due to poor sealing at the top of the cylinder, try adding 1-2 drops of oil around the release button or seal ring to enhance sealing. Note: This method is only effective for some models and is a temporary measure. Long-term use still requires replacing the gas spring.

5. Professional Repair
   If the issue remains unresolved after self-inspection, or if cracks, significant rust, or deformation are found on the surface of the gas rod, stop using the chair immediately and contact a professional repair service. For example, Guangzhou Jianhe Engineering Services offers on-site inspection, part replacement, and on-site debugging services, efficiently resolving complex malfunctions and avoiding secondary damage caused by improper operation.