Office Chair Bottom Description
The bottom structure of an office chair consists of core components such as the base, gas lift, five-star foot (or bow-shaped/fixed wooden base), and casters, with its design directly affecting comfort, safety, and functionality.
1. Base: Functional Hub and Adjustment Core
The base is a key component connecting the seat, gas lift, and five-star foot, responsible for functions such as height adjustment, backrest recline, angle locking, and recline tension adjustment. Regular bases offer basic functionality, while high-end ergonomic chair bases employ synchronous tilt technology to dynamically adapt to the lumbar and back curves, reducing fatigue from prolonged sitting. Base types include fixed, single-recline, lockable recline, synchronous recline, and cable-controlled bases, with functional complexity increasing with price. When selecting, pay attention to whether the adjustment range meets your needs; cable-controlled bases are more convenient for frequent adjustments.
2. Gas Lift: Safety Certification is Key
The gas lift enables seat height adjustment through high-pressure nitrogen. Its safety directly determines usage risks. Poor-quality gas lifts may pose explosion risks due to insufficient nitrogen purity, thin cylinder walls, or lack of explosion-proof steel plates. Legitimate products must pass international certifications such as SGS and BIFMA and be labeled with explosion-proof fatigue test parameters. Chairs in the mid-range price bracket (300-800 yuan) generally use explosion-proof steel plates to reinforce the gas rods, providing greater safety assurance.
3. Five-Star Foot: Balancing Material and Load-Bearing Capacity
The five-star foot is the load-bearing foundation, with common materials including nylon, steel, and aluminum alloy. Nylon feet are lightweight and quiet but have limited load-bearing capacity (about 80kg). Steel feet are sturdy and durable but may rust if the electroplated layer is of poor quality. Aluminum alloy feet offer the best overall performance (load-bearing capacity up to 150kg) but are more expensive. A five-claw design provides the best balance, with PU wheels recommended for hard floors to prevent scratches and nylon hard wheels for carpets for easier movement. Special scenarios (such as medical or laboratory settings) may use bow-shaped bases (without wheels, structurally stable) or fixed wooden bases (solid wood, highly stable).
4. Casters: Material Suited to Usage Scenarios
Caster material directly affects mobility experience and floor protection. Nylon wheels are wear-resistant and have high load-bearing capacity, suitable for carpets. PU wheels are quiet and protect wooden floors, suitable for hard surfaces. Medical or laboratory settings may use brake casters with locking functions to prevent accidental chair movement.
Purchase Recommendations:
The materials and design of the bottom structure are far more important than appearance. Prioritize confirming the safety certification of the gas lift, the material of the five-star foot, and the type of casters. Mid-range chairs can already meet basic safety needs, while high-end products focus more on dynamic support and material durability.
