Office Chair Bouncing Up

The bouncing up of an office chair may be caused by issues with the gas spring, metal frame, spring mechanism, or structural friction, and poor-quality gas springs may even pose an explosion risk.

1. Abnormal internal pressure in the gas spring
   The core component of a pneumatic chair is the gas spring (pneumatic spring), which is filled with high-pressure nitrogen gas to enable height adjustment. If the sealing ring ages or the gas pressure is unstable, pressure may suddenly be released when force is applied, producing a sound similar to a broken spring and causing the chair to bounce abnormally. If a poor-quality gas spring uses air instead of nitrogen, oxygen may react with internal substances, and under heavy pressure, an explosion may occur, causing violent bouncing and posing a serious safety hazard.

2. Fatigue fracture of the metal frame
   The metal welding points on the chair base, support rods, or caster brackets may age after long-term use. When suddenly subjected to force (such as when standing up or turning around), the aged parts may crack instantly, accompanied by a metal cracking sound, causing the chair to wobble or bounce abnormally. Such issues are more common in low-priced products or those with a long service life.

3. Displacement of the spring or catch mechanism
   If the spring device for the backrest's reclining function or the gears in the rotating base are loosely engaged, the spring may become dislodged or the gears may skip teeth, causing a "bouncing" sound and malfunctioning adjustment features. For example, the backrest may not stay fixed or the rotating base may get stuck, both of which may be caused by this issue.

4. Damage from friction between plastic catches and metal
   Low-priced chairs often feature a structural design where plastic wraps around metal. Long-term friction may cause the plastic parts to crack. When fragments fall into gaps, they may jam the metal components, producing a bursting sound when suddenly moved and causing abnormal movement of the chair. Such issues are more common in products with poor structural stability.

Daily maintenance recommendations:

• Apply lubricating grease to the telescoping rod of the gas spring every six months to reduce friction and abnormal sounds;
• Regularly check for loose screws and welding points to prevent metal fatigue fractures;
• Prioritize products with SG certification or SGS test reports to ensure that the gas spring is filled with nitrogen instead of air, reducing the explosion risk.
  If the chair exhibits abnormal bouncing or abnormal sounds, it is recommended to stop using it immediately and contact a professional for inspection and repair.