Office Chair Backrest Rebound

The issue of office chair backrest rebound can be resolved by checking the handle and base, troubleshooting the cable-controlled switch, and assessing the condition of the small gas cylinder. Here are the specific steps:

Checking the Handle and Base
The handle and base are the core components for adjusting the backrest rebound. First, confirm that the handle is in the correct position: pulling the handle to the right unlocks the backrest, allowing it to regain elasticity; pushing it to the left locks the backrest, disabling the rebound function. If the handle operates normally, further inspect the cylindrical knob on the base—this knob controls the rebound force by adjusting the internal spring pressure. Rotating the knob clockwise increases the rebound support force, suitable for users who are heavier or prefer firmer support; rotating it counterclockwise decreases the rebound force, suitable for users who are lighter or prefer softer support. When adjusting, rotate the knob gradually and test the backrest feedback to avoid over-adjustment and potential structural damage.

Troubleshooting the Cable-Controlled Switch
If the chair is equipped with a reclining function and the adjustment fails, focus on inspecting the cable-controlled switch. The cable-controlled switch connects to the base via a cable, controlling the backrest angle and rebound. If the backrest does not respond after pressing the switch, first observe whether the switch closes automatically: if it does not, the cable may be loose, broken, or disengaged. In this case, try the following operations:

1. Loosen the fixing nut of the cable-controlled switch, adjust the cable length to the appropriate position, and then refasten it;
2. If the cable is broken, replace it with a cable-controlled component of the same specification;
3. Check whether the cable is disengaged from the base connection point, reattach it, and test the function.
   After adjustment, test the backrest rebound and angle adjustment multiple times to ensure stable functionality.

Assessing the Condition of the Small Gas Cylinder
The small gas cylinder is the power source for backrest adjustment, with its internal high-pressure gas providing rebound support. If the gas cylinder fails, the backrest will not rebound or will rebound slowly. To determine this, pinch the thin end of the gas cylinder and press down: if the gas cylinder retracts easily without resistance, it indicates internal gas leakage, and a new gas cylinder is required. When replacing, note the following:

1. Choose a model that matches the original gas cylinder's specifications (such as the diameter of the gas cylinder and the stroke length);
2. Before replacement, invert the chair and use a tool to unscrew the connecting screws between the old gas cylinder and the base;
3. When installing the new gas cylinder, ensure a tight connection to prevent air leakage.
   After replacement, test whether the backrest rebound force is even to avoid tilting due to insufficient gas cylinder pressure.