Increasing the Angle of an Office Chair

Adjusting the angle of an office chair to be larger should be done according to the chair type and adjustment method, but the maximum recline angle is generally limited to 135 degrees, as exceeding this may pose safety risks.

Adjustment Methods

1. Lever-Type Adjustment
   Most office chairs are equipped with an adjustment lever beneath the seat. By pulling or pushing it, you can change the angle of the backrest by leaning back, and it will automatically lock when released. Maintain body balance during operation to avoid instability caused by sudden recline.

2. Knob-Type Adjustment
   The knob is usually located on the side or back of the chair. By rotating it, you can adjust the tightness of the gas spring. Rotating clockwise increases the recline resistance, while rotating counterclockwise decreases the resistance or unlocks the angle. Adjust slowly to avoid imbalance caused by sudden changes in resistance.

3. High-End Electric Adjustment
   Some high-end models are equipped with electric buttons or control panels, allowing for precise and stepless angle adjustment. Users can set the target angle with the buttons, and the system will automatically adjust and lock it. Ensure a stable power supply for these chairs to avoid functional failure due to power outages.

4. Universal Mechanical Lever Adjustment
   The adjustment handle is mostly located beneath the right side of the seat (some models may have it on the left or front). Continuously pull or lift the handle while leaning back to tilt the backrest to a comfortable angle, then release the handle to secure it. Be cautious of the handle's rebound force to avoid pinching your fingers.

Maximum Angle Limitation

Manufacturers generally limit the maximum recline angle to 135 degrees, primarily based on the following considerations:

• Structural Stability: Beyond 135 degrees, the backrest's load-bearing capacity decreases, and long-term use may lead to deformation of the metal frame or loosening of connectors.
• Center of Gravity Balance: Excessive recline angles shift the chair's center of gravity backward, increasing the stress on the spine support and the connection between the gas spring and the seat, potentially leading to fracture risks.
• Market Exceptions: Some午休 chairs (siesta chairs) claim to reach 160 degrees, but such products often achieve this by sacrificing load-bearing capacity. In actual use, the backrest may deform due to uneven force distribution, posing safety risks and not recommended for long-term use.

When adjusting, strictly follow the product manual and avoid forcibly exceeding the angle limit to ensure safety.