Office Chair Touching the Ground

The scraping of an office chair's pneumatic rod against the ground is mainly caused by improper adjustment of the pneumatic rod, component aging, base structure issues, and mismatched ground environments. Solutions include adjusting the height, reinforcing the base, replacing components, or optimizing ground adaptability.

1. Improper Adjustment of the Pneumatic Rod
When the lifting height of the pneumatic rod exceeds a reasonable range (typically adjustable from 10-15cm), adjusting it to the lowest setting can cause the metal structure of the base to directly touch the ground, especially on hard surfaces like tiles or concrete, potentially scratching the surface. Countermeasures: Immediately lower the seat height to the middle position (a reasonable height is when the backrest forms a 90° angle with the knees) and leave a 1-2cm gap to avoid extreme contact; if adjustment is difficult, use a crowbar to assist.

2. Component Aging
After more than 3 years of use or frequent use, the aging of the seal ring in the pneumatic rod can lead to a decrease in internal nitrogen pressure (usually automatic sinking occurs when below 5MPa), weakening the support force and causing the outer wall of the metal rod to touch the ground. Additionally, aging of the bottom rubber ring or wear on the nylon casters (wheel axles tend to form burrs after 3000 uses) can also exacerbate friction. Countermeasures: Check if the pneumatic rod is sinking; if severely aged, replace it with a new rod that meets the ISO 7174 standard or has an SG/SGS certification mark; install a nylon pad with a diameter of about 3cm at the bottom of the pneumatic rod to buffer pressure; for worn casters, replace them with PU soft wheels (for solid wood floors) or nylon wheels (for marble floors).

3. Base Structure Issues
If the seat base is deformed by impact, the screws at the connections are loose, or the tilt angle of the five-claw base is abnormal, it can cause the axis of the pneumatic rod to shift, resulting in the metal rod tilting and touching the ground. Cheap swivel chairs may have excessive design tolerances, and deformation of the explosion-proof base steel plate can also trigger a chain reaction. Countermeasures: Use a hex wrench to check and tighten all screws on the base; if the base is deformed, contact the manufacturer to replace compliant components; regularly check the chair's balance (especially in old factory environments with slightly tilted floors, it is recommended to adjust every six months).

4. Mismatched Ground Environment
When hard casters rub against rough ground (such as concrete or tile joints), it can cause the entire chair to vibrate, leading to loosening of the fixing screws of the pneumatic rod; the hardness difference between glazed tiles and aluminum alloy bases (contact pressure can reach 3.5MPa) may scratch the ground. Countermeasures: Choose wheels according to the ground material (PU soft wheels for solid wood floors, nylon wheels for marble); lay PVC protective pads between the chair feet and the ground; avoid frequently moving the chair on tile joints.