Office Chair Disassembly Diagram

The disassembled structure of a typical swivel office chair can be divided into five core parts: the base, gas lift, seat plate, cushion, and backrest. The specific disassembly logic and functions are as follows:

1. Base: The Core of Support and Stability
The base typically features a five-star design, with materials often being engineering plastics or metals (such as aluminum alloy). Its core function is to provide stable support for the entire chair. The five-star structure disperses pressure to ensure the chair remains stable during rotation or movement. High-end models (such as the Yongyi ACT280 Ultra) may use black nickel-plated thickened aluminum alloy for the base, paired with a dual-bearing structure to further enhance load-bearing capacity and durability. Additionally, omnidirectional wheels are installed at the ends of the base to enable flexible movement of the chair.

2. Gas Lift: The Power Source for Height Adjustment and Rotation
The gas lift is a key component that enables the office chair to adjust its height and rotate. It is filled with high-pressure nitrogen gas internally, controlling the seat height through piston movement while allowing 360-degree free rotation. The grade of the gas lift (such as Class 3 or Class 4) directly affects its load-bearing capacity and service life. High-end products use gas lifts that have passed international safety certifications to avoid explosion risks. During disassembly, a specialized tool is required to tap the connection point between the gas lift and the seat plate to separate them.

3. Seat Plate: The Hub for Connection and Adjustment
The seat plate is located between the cushion and the gas lift, responsible for connecting various components and enabling reclining adjustment functions. It typically includes mechanical structures such as a reclining angle locking device and a height adjustment knob, allowing users to control the tilt of the backrest or the height of the cushion by operating the seat plate. The material of the seat plate is mostly reinforced plastic or metal, which needs to withstand the stress caused by body weight and frequent adjustments. Therefore, the design must balance strength and lightweight properties.

4. Cushion and Backrest: The Direct Embodiment of Ergonomics
The design of the cushion and backrest directly affects user comfort. Modern office chairs often use high-density foam or memory foam for filling, with breathable mesh fabric or leather covering the surface to balance support and breathability. The backrest is usually divided into fixed and adjustable types. High-end models (such as the Yongyi ACT280 Ultra) may use an aluminum alloy frame for the backrest and design it with an ergonomic curve to fit the spine, reducing fatigue from prolonged sitting. During disassembly, first remove the connecting screws between the backrest and the seat plate, and then separate the fixing components between the cushion and the seat plate.

Practical Disassembly Operation Suggestions: If you need to disassemble an office chair, follow these steps:

• Use a screwdriver to remove the fixing screws between the backrest and the armrests, separating the backrest assembly;
• Flip the cushion over, locate and remove the connecting screws between the cushion and the seat plate;
• Use a rubber mallet to gently tap the connection point between the gas lift and the seat plate to separate them;
• Finally, disassemble the omnidirectional wheels of the base (usually fixed by snap fasteners).
  Note: Before disassembly, ensure the chair is at its lowest height and avoid using excessive force to prevent damage to the components.