Office Chair Bottom Lever
The lever (adjustment rod) under the office chair is mainly used to adjust the chair's height, tilt, and support force. Some ergonomic chairs also have more complex adjustment functions. Details are as follows:
1. Adjusting Chair Height
The height adjustment rod is typically located at the center of the chair's bottom and achieves lifting and lowering functions through a gas lift (gas spring). During operation, users need to gently push the rod and slowly adjust the height. Some chairs require rotating the rod clockwise or counterclockwise, or pulling up or pushing down to complete the adjustment. The high-pressure gas inside the gas lift pushes the piston to move when compressed, enabling stepless adjustment of the seat height. During adjustment, avoid using excessive force to prevent damage to the gas lift or sudden seat movement that could cause imbalance.
2. Adjusting Chair Tilt
The tilt adjustment rod is mostly located beneath the front of the seat and is connected to the seat. Users can adjust the recline angle of the chair back by pushing backward or pulling forward on the rod and then releasing it. Some chairs use a plug-in design, where pulling out or inserting the control rod beneath the right side of the seat unlocks or locks the current recline angle of the chair back. This type of adjustment relies on the hinge structure between the chair back and the base, with a locking device to fix the angle to meet users' different sitting posture needs.
3. Adjusting Chair Support Force
The support force adjustment rod is usually located beneath the rear of the seat and adjusts the elasticity or resistance of the chair back's recline by rotating the rod. Rotating the knob clockwise increases the chair back's elasticity (increases resistance, making reclining more strenuous), while rotating it counterclockwise decreases the elasticity (reduces resistance, making reclining easier). This function relies on the spring or damping device inside the base, achieving dynamic changes in support force by adjusting the preload to accommodate the reclining needs of users with different weights.
4. Complex Adjustment Functions (Ergonomic Chairs)
Some high-end ergonomic chairs have more refined lever functions, which may include multi-stage recline angle adjustment (such as 3-stage locking), forward tilt function adjustment (to meet the needs of desk work), lumbar support force adjustment (adjusting the intensity of lumbar support through an independent rod or knob), etc. These adjustments are usually integrated into the same lever or achieved through multiple independent control rods. Users should follow the instructions to avoid misadjustment.
