Office Chair Reclining Backrest

There are four main methods for adjusting the reclining backrest of an office chair: pneumatic rod, knob, lever, and button adjustments. Here are the specific operations and their significance:

Pneumatic rod adjustment is the most common method. The adjustment handle is usually located beneath the seat or on the right-hand side. To use it, first sit on the chair, lean your body against the backrest, and reach under the seat with one hand to find the handle. Pulling the handle upward unlocks the backrest. Then, lean back slightly with your back, and the backrest will gradually recline with your body's force. Once you reach a comfortable angle, release the handle to lock the backrest in place. To return to an upright position, pull the handle again and lean forward slightly with your back; the chair back will automatically spring back.

Knob adjustment involves a knob typically located on the side or rear of the backrest, controlling tightness through rotation. Rotating the knob clockwise gradually tightens the backrest, increasing resistance to reclining and reducing the angle. Rotating it counterclockwise has the opposite effect, loosening the backrest for easier reclining and a wider angle range. It is recommended to rotate and test-sit simultaneously to find the appropriate damping force, avoiding excessive looseness that may cause the body to slide backward or excessive tightness that affects comfort.

Lever adjustment involves a lever usually located beneath the seat, near the right or left side. To use it, gently pull up or push down the lever to unlock the backrest. Lean back to a suitable angle and release the lever to lock the backrest in place. Some high-end models support multi-position adjustment with the lever, allowing you to switch between positions with each pull, meeting different scenario needs.

Button adjustment is commonly found in office chairs equipped with electric or smart functions, with buttons usually located on the armrests on both sides of the seat. Pressing the button adjusts the angle of the chair back, and some models support preset angle memory functions, allowing users to set commonly used angles in advance and switch with one button.

Adjusting the angle of the backrest is crucial for health. When maintaining a 90-degree upright sitting posture for an extended period, the pressure on the lumbar intervertebral discs increases significantly, leading to fatigue and even injury. When the backrest reclines to about 110 degrees, the pressure on the intervertebral discs can be effectively reduced, allowing the spine to naturally extend in a relaxed state. When the backrest forms a 100-degree to 110-degree angle with the thighs, the lumbar spine experiences the most balanced force. At this time, the lower back should be pressed firmly against the backrest, and the muscles will gradually relax. It is recommended to adjust the backrest angle every hour of work, combined with short breaks, to effectively relieve lower back pressure.