Classification of Office Chair Bases

Office chair bases are mainly classified into three categories based on functional design, structural characteristics, and basic features, as detailed below:

Classification by Functional Design

• Regular Three-Function Base: Equipped with two control devices—a lever and a knob—it offers three basic functions: recline locking, seat height adjustment, and recline tension adjustment. The backrest recline angle typically ranges from 125 to 130 degrees, meeting basic sitting posture adjustment needs and suitable for office scenarios with low functional requirements.
• Ergonomic Four-Function Base: Utilizing wire control technology, it adds seat fore-and-aft adjustment to the regular three functions. The backrest recline angle is approximately between 130 and 135 degrees. It offers diverse operation methods, including buttons, levers, and dials, allowing users to choose based on personal habits. This design better conforms to ergonomics, enhancing user comfort.
• Ergonomic Five-Function Base: In addition to the adjustment functions of the ergonomic four-function base, it adds seat angle adjustment. The base, seat, and backrest are pre-assembled during factory production, making installation simple and providing users with a more personalized sitting posture adjustment experience.
• Self-Weight Four-Function Base: It upgrades the backrest recline tension adjustment from manual to automatic, adjusting the recline tension according to the user's weight for greater convenience. However, it may not meet the special tension requirements of some users.

Classification by Structural Characteristics

• Single-Spring Base: It feels easy to sit on in the first half but difficult in the second half, with a short stroke and uneven tension. Prolonged use may cause fatigue, making it suitable for scenarios with low recline tension requirements and short usage times.
• Double-Spring Base: With an additional spring to assist in controlling force, it solves the problem of uneven resistance during recline, offering better stability and greater comfort. It meets the recline comfort needs of most users.
• Adaptive Base: It automatically adjusts the recline force according to the user's weight. However, when the weight exceeds the normal range, the adjustment may not be precise, reducing comfort. It is suitable for users with normal weight ranges.
• Fiberglass Base: Also known as a dual-fiberglass spring base, it has minimal deformation during backrest recline across the entire stroke, with uniform recline resistance. However, differences in production processes and material quality among manufacturers lead to varying user experiences.

Classification by Basic Features

• Wheel Base: Equipped with wheels at the bottom, it facilitates movement and position adjustment, suitable for various floor types, especially office environments requiring frequent position changes, such as open office areas.
• Fixed Base: It lacks mobility, offering a more stable design and stronger support. It is suitable for scenarios requiring prolonged sitting, such as conference rooms or fixed workstations in offices.
• Pneumatic Base: Combining comfort and adjustability, it allows easy height adjustment of the chair through a pneumatic rod, suitable for office environments requiring height adjustability and comfort, such as high-end office desks or conference chairs.