Office Chair Without Hydraulic

When an office chair does not have hydraulic adjustment, it typically uses a gas spring, mechanical, or electric adjustment method to achieve height adjustment. Here are the details:

Gas Spring Adjustment
The gas spring is the mainstream non-hydraulic adjustment method in the current market. Its core principle is to achieve height adjustment by compressing nitrogen gas. When the user sits down, their weight compresses the nitrogen gas inside the gas spring, reducing its volume and increasing its pressure, causing the chair to descend. When the user stands up, the nitrogen gas pressure is released, pushing the piston upward and restoring the chair to its original height. The gas spring has an automatic locking function. After adjusting to the target height, the internal mechanical structure locks the position to ensure safety during use. Additionally, the gas spring offers advantages such as easy operation, high safety, light weight, and quiet performance. Currently, over 90% of office chairs on the market adopt this design. However, the quality of the gas spring directly affects safety. Poor-quality products may suffer from nitrogen gas leakage due to inadequate sealing, even posing an explosion risk. Therefore, it is essential to choose products that have passed international safety certifications (such as BIFMA and SGS).

Mechanical Adjustment
Mechanical adjustment achieves height adjustment through manual operation and is commonly found in budget-friendly office chairs. Its structure typically includes a rotatable or pullable adjustment lever located at the bottom of the chair. Users can change the chair's height by rotating the lever (e.g., clockwise to lower, counterclockwise to raise) or pulling a lever (e.g., pulling up to unlock, pressing down to lock). The advantages of this method are its simple structure, low cost, and no need for a power source, making it suitable for users with limited budgets or low demand for smart features. However, its drawbacks include lower adjustment precision and the potential for a compromised user experience due to frequent manual operations.

Electric Adjustment
Electric adjustment is a common feature in high-end office chairs, achieving height adjustment through built-in motors and control systems. Users can simply press a button or use a remote control to drive the chair smoothly up or down, with some products even supporting preset height memory functions. Electric adjustment offers high intelligence and easy operation, making it particularly suitable for users who need to frequently adjust their sitting posture (such as programmers and designers). However, its drawbacks include higher costs and the need for a power connection, which limits its usage scenarios. Additionally, the reliability of the electric system (such as motor lifespan and circuit safety) requires close attention to avoid height adjustment failures due to malfunctions.