Office Chair Bottom Structure
The bottom structure of an office chair typically consists of chair legs, casters, gas cylinders, a base, and safety protection components, with some special models also including linkage brackets or reinforced bases. Here is a detailed analysis of the specific structure:
1. Chair Legs
Chair legs are the core components that support the entire weight of the office chair. Common materials include metal (steel, aluminum alloy), nylon, and solid wood. Metal chair legs, with their high strength and strong load-bearing capacity, are mostly used in commercial settings. Nylon chair legs are lightweight and provide significant noise reduction during movement, making them suitable for home or office environments. Solid wood chair legs are commonly found in high-end models, offering both aesthetics and durability. The bottom of chair legs usually adopts a five-star design (five-claw structure) to enhance stability by dispersing pressure. Some gaming chairs use six-claw or wider chair legs to increase load-bearing capacity.
2. Casters (Wheels)
Casters are installed at the ends of chair legs and directly affect the mobility experience. Ordinary casters are suitable for hard floors (such as tiles and concrete), while PU wheels, covered with soft materials on the surface, can slide silently and avoid scratching wooden floors. High-quality casters are coated with a TPE soft rubber layer to further reduce noise and improve smoothness. Casters need to support 360ยฐ rotation to ensure the chair can turn flexibly.
3. Gas Cylinders (Gas Springs)
The gas cylinder is located at the center of the chair legs, connecting the base to the seat, and enabling height adjustment and rotation of the seat through high-pressure nitrogen inside. Users can control the lifting and lowering by pressing the handle, and its safety is crucial. SGS Class 4 gas cylinders that comply with national standards typically have a diameter between 3.8-5cm, with manufacturer certification codes engraved on the side for traceability of production information. Poor-quality gas cylinders may pose an explosion risk due to insufficient sealing, so it is essential to choose products that have passed safety certification.
4. Base
The base is the 'control center' of the office chair, responsible for connecting the seat, gas cylinder, and chair legs, and integrating multiple adjustment functions:
- Height Adjustment: Enables seat lifting and lowering through the gas cylinder;
- Reclining Function: Supports backrest tilting, with some high-end bases featuring synchronous tilting technology to dynamically match the angle between the backrest and seat cushion, providing lumbar support;
- Tension Adjustment: Allows users to adjust the reclining resistance according to their weight to avoid being too light or too heavy;
- Locking Function: Fixes the reclining angle to meet different usage scenario requirements.
5. Safety Protection Components
In recent years, mainstream products have strengthened safety designs: a 2mm thick steel explosion-proof cover is installed around the gas cylinder to block accidental impacts; some high-end models embed ABS engineering plastic protective sheets in the base to reinforce lateral support and prevent base breakage.
Special Structures
- Recliner Models: Include bottom linkage brackets to support fully reclining the backrest, forming a lying mode;
- Gaming Chairs: Equipped with large wheel sets with a diameter of over 8cm to improve passability; the base adopts a metal reinforcement design to enhance load-bearing capacity and durability.
