Office Chair Structure Classification

The structural classification of office chairs can mainly be carried out from three perspectives: functional components, overall structure, and usage scenarios and functions.

1. Classification by Main Functional Components

1. Chassis: As the core adjustment hub of an office chair, the chassis is responsible for connecting the seat, gas lift, and five-star base, enabling functions such as seat height adjustment, backrest recline, recline angle locking, and recline tension adjustment. Its main body is usually welded from low-carbon steel pipes or die-cast from aluminum alloy to ensure structural strength and adjustment flexibility.
2. Gas Lift (Gas Cylinder): A core component that achieves height adjustment through high-pressure nitrogen, its safety must comply with international certification standards (such as BIFMA, SGS) to prevent safety risks caused by abnormal gas pressure.
3. Five-Star Base: The foundational structure that supports the user's weight, with materials including nylon, steel, or aluminum alloy, directly affecting load-bearing capacity and stability. High-quality five-star bases need to have impact-resistant and wear-resistant properties.
4. Casters (Wheels): Made of PU or nylon materials, they balance smooth mobility and quiet operation while reducing scratches on the floor. Some high-end models are equipped with brake functions to enhance usage safety.
5. Seat Cushion and Backrest: The seat cushion disperses hip pressure through forward and backward sliding, forward tilting, or rocking designs; the backrest is divided into high backrests (supporting from the waist to the shoulders) and low backrests (supporting only the waist), with high backrests being more suitable for long-term office scenarios.

2. Classification by Overall Structure

An office chair can be simplified into five parts: base, gas lift, seat cushion, backrest, and armrests:

1. Base: Mostly made of cast iron, it disperses pressure through a five-claw or circular design to ensure load-bearing stability.
2. Gas Lift: Connects the base to the seat cushion, enabling height adjustment functions, and needs to cooperate with the chassis to complete height adjustments.
3. Seat Cushion and Backrest: Provide comfort and support, with materials mostly being foam or mesh fabric, and some models equipped with breathable designs.
4. Armrests: Mainly made of engineering plastics, some products are equipped with adjustable armrests (such as height adjustment and rotation functions) to adapt to different sitting postures.

3. Classification by Usage Scenarios and Functions (Taking Training Chairs as an Example)

1. Seat Panel and Backrest: Provide basic support, with materials needing to balance durability and comfort.
2. Chair Frame (Footrest): Connects the seat panel and backrest, bearing the user's weight. Folding training chairs have folding mechanisms at the chair frame for easy transportation; stackable training chairs achieve multi-chair stacking through the shape cooperation of the seat panel and chair frame, saving space.
3. Writing Tablet: Some training chairs are equipped with foldable writing tablets to meet the needs of writing or placing electronic devices.