Office Chair Bottom Part
The bottom part of an office chair integrates three core functions: adjustment, support, and mobility. It mainly consists of four components: the base, gas lift, five-star foot, and casters, each with its own functions and characteristics as follows:
The base is the adjustment hub of the office chair, responsible for connecting the seat, gas lift, and five-star foot, and enabling multiple functional adjustments. Its main body is typically welded from low-carbon steel pipes or die-cast from aluminum alloy, providing high strength and stability. Core functions include:
- Seat height adjustment: Achieved by controlling the gas lift, allowing users to adjust their sitting posture height according to their needs to accommodate different desk heights or usage scenarios.
- Backrest recline and locking: Supports multi-position or stepless locking of the recline angle to meet users' different posture needs during rest or work.
- Recline tension adjustment: Controls the tightness of the backrest recline to adapt to the recline resistance requirements of users with different weights, preventing่ฟๅฟซ or slow recline.
- Synchronized tilt function: High-end bases (such as linked bases or synchronized tilt mechanisms) feature intelligent linkage design. When the user reclines, the backrest and seat cushion adjust their angles simultaneously, maintaining proper lumbar support and reducing fatigue from prolonged sitting.
The gas lift is the core component of a pneumatic height-adjustable chair, enabling seat height adjustment through high-pressure nitrogen. Its safety is crucial, and legitimate products must pass international safety certifications such as SGS and BIFMA and undergo at least 120,000 anti-burst fatigue tests to ensure no leakage or explosion risks during long-term use. The lifting principle of the gas lift is based on the compression and release of high-pressure nitrogen inside, allowing users to achieve smooth lifting by operating the adjustment lever on the base.
The five-star foot is the key component supporting the user's entire body weight, and its material directly affects its load-bearing capacity and stability. Common materials include nylon, steel, and aluminum alloy, with aluminum alloy offering the best overall performance, combining lightweight, high strength, and corrosion resistance. The design of the five-star foot must ensure even weight distribution to avoid tipping risks due to uneven load-bearing.
The casters' material directly affects mobility smoothness, noise level, and floor protection performance. Nylon casters have become the mainstream choice due to their wear resistance, quiet operation, and minimal damage to floors. Some high-end casters use PU (polyurethane) material to further reduce noise and enhance mobility smoothness. The design of casters must consider compatibility with different floor types (such as carpets and wooden floors) to ensure a good user experience.
