Office Chair Central Axis Touching Ground

The central axis of an office chair touching the ground usually refers to the situation where the central axis of the five-star base of the office chair comes into contact with the ground, preventing the chair from rising, lowering, or rotating normally. This can be caused by component damage, improper installation, or issues with the usage environment.

Common Causes and Analysis

1. Failure of the Pneumatic Rod
   The pneumatic rod is the core component for the height adjustment of an office chair. If its internal sealing structure is damaged due to long-term use, external impact, or quality issues, it can lead to gas leakage. In this case, the central axis may directly touch the ground due to the loss of support force, resulting in the chair being unable to rise, lower, or sink. The lifespan of a pneumatic rod is typically 3-5 years, and overuse or frequent adjustments can accelerate wear and tear.

2. Deformation of the Five-Star Base
   If the five-star base (the chair's base) is deformed due to exceeding its weight limit (e.g., over 120kg) or being impacted, it can cause the position of the central axis to shift, making the shaft directly contact the ground. Five-star bases made of metal have strong resistance to deformation, but those made of plastic or low-quality alloys are prone to damage due to aging or external forces.

3. Incorrect Installation
   If the pneumatic rod is not correctly inserted into the central hole of the five-star base or the fixing screws are not tightened properly, it can cause the central axis to touch the ground. During installation, ensure that the pneumatic rod is inserted vertically and that the five-star base is firmly connected to the seat.

4. Uneven Ground
   Using an office chair on an uneven or sloped surface can cause excessive local stress on the central axis, making it touch the ground. Long-term use in such an environment can accelerate the wear and tear of the pneumatic rod and the five-star base.

Solutions

• Check the Pneumatic Rod: If the chair cannot rise or lower, replace it with a new pneumatic rod (choose a specification that matches the chair model).
• Repair the Five-Star Base: Minor deformations can be corrected with professional tools, while severe damage requires replacing the base.
• Reinstall: Disassemble the chair, ensure that the pneumatic rod is inserted vertically into the central hole of the five-star base, and tighten all screws.
• Adjust the Usage Environment: Move the chair to a flat surface or add anti-slip pads to reduce the impact of the ground.

Preventive Measures

• Avoid exceeding the weight limit (refer to the weight limit specified in the chair's instruction manual).
• Regularly check the condition of the pneumatic rod and the five-star base, and replace them promptly if wear is detected.
• Avoid dragging the chair when moving it to prevent the five-star base from hitting hard objects.