Office Chair Backrest Falls Off

If the backrest of an office chair falls off, first check the locking mechanism, screw connections, and component wear. Depending on the specific cause, choose methods such as tightening screws, replacing components, or temporary fixation to resolve the issue.

1. Locking Mechanism Failure or Adjustment Issues

   • Locking Switch Not in Place: Check if the backrest locking button/lever is in the 'locked' position. Some models require pressing firmly to the bottom for complete locking. If the switch is loose or rebounds, it may be due to aging internal springs/latches; manually push it to the tightest position and test again.
   • Adjustment Rod Failure:
     • Pneumatic Rod Adjustment: Check if the screws connecting the adjustment rod to the backrest bracket are loose; tighten with a wrench. If the internal seal of the pneumatic rod fails, causing insufficient pressure, try adjusting the backrest angle multiple times quickly before locking. If ineffective, replace the pneumatic rod.
     • Mechanical Rod Adjustment: Check if the meshing gears between the mechanical rod and the backrest are worn. If gear teeth are missing or the meshing gap is too large, replace the gear assembly.
   • Connection Point Issues: Observe if the screws/latches at the bottom of the backrest and the chassis are detached or broken. Tighten loose screws; for broken latches, use zip ties for temporary fixation or replace the bracket. If the anti-wobble pads (rubber/plastic spacers) on the chassis are displaced or aged, readjust their positions.

2. Loose Screws
   Check if the screws connecting the backrest and the chair body are loose; tighten with a screwdriver or wrench. If the screw hole is stripped, insert wood shavings or toothpicks to increase friction before tightening.

3. Component Wear
   If screws or latches are severely worn, replace with new components. Pay attention to screw specifications during disassembly to ensure new components match for installation.

4. Temporary Emergency Methods
   If immediate repair is not possible, use nylon zip ties to secure the adjustment rod to the backrest bracket (avoid affecting height adjustment). Meanwhile, avoid leaning back for extended periods or frequent shaking to prevent the fault from worsening.

5. Other Reinforcement Methods
   For loose wooden backrests, reinforce with metal parts (such as angle brackets): drill holes in the backrest and chair body with an electric drill, and fix the metal parts to enhance stability. Alternatively, apply latex or woodworking glue at the joints, bind tightly with a rope, and let it sit for more than 12 hours (not suitable for metal materials or severe looseness).

Precautions: If the internal metal structure of the backrest is fractured or deformed, it is recommended to contact professional repair personnel to avoid safety hazards caused by self-welding.