Office Chair Base Cylinder

The cylinders in office chair bases can be primarily classified into two types based on their structure and function: gas springs and chair posts (leg posts), with their names and functions as follows:

1. Gas Spring: The Core Component for Adjustable Height
If the cylinder is an adjustable metal rod, its professional name is a gas spring. It achieves height adjustment through the compression and release of high-pressure nitrogen gas inside. When a user sits down, their weight compresses the gas spring, causing the nitrogen gas to compress and the chair to lower. When the user stands up, the nitrogen gas expands, pushing the piston and raising the chair. Some advanced gas springs also feature multi-position locking functions, allowing the chair height to be fixed. Additionally, the damping design of gas springs can adjust the tightness of the chair back's recline, meeting different sitting posture needs. Its internal structure includes a sealed piston, a high-pressure nitrogen gas chamber, and an explosion-proof device, which absorbs body pressure through gas pressure buffering, reducing the impact on the spine during prolonged sitting and enhancing comfort. It is important to note that poor-quality gas springs may pose risks of nitrogen gas leakage or explosion due to poor sealing, so it is advisable to choose products that have passed international safety certifications (such as BIFMA, SGS) when purchasing.

2. Chair Post (Leg Post): The Fundamental Structure for Stable Support
If the cylinder is a fixed support component, it is commonly referred to as a chair post or leg post. It is typically made of metal (such as steel, aluminum alloy) or high-strength plastic and is located at the center of the chair's base, connecting the base to the seat. Its core function is to distribute body weight, enhance the overall stability of the chair, and prevent tipping. Some chair posts are equipped with anti-slip pads or silent wheels at the bottom, which not only reduce floor wear but also lower noise during movement. In five-star base office chairs, chair posts also need to withstand stress from five directions, so they must possess high bending strength and fatigue resistance. In terms of design, the diameter and wall thickness of chair posts directly affect their load-bearing capacity. For example, the chair posts of heavy-duty office chairs typically have a diameter exceeding 50mm and a wall thickness of over 3mm to ensure they do not deform during long-term use.

Summary: The cylinders in office chair bases should be distinguished by their functions—adjustable ones are gas springs, responsible for height adjustment and buffering; fixed ones are chair posts, undertaking support and stability functions. These two components work together to ensure the comfort and safety of office chairs.