Round Design of Office Chair Base

The round design of an office chair base typically refers to the circular structural elements in the gas lift or base design. The following explains this from two aspects: core components and base design.

Gas Lift: The Core Circular Component for Height Adjustment

The gas lift is the core component for height adjustment in an office chair, with a cylindrical appearance. Its professional names are 'gas lift' or 'gas spring'. It is filled with high-pressure nitrogen gas internally, and the height of the chair surface is adjusted by compressing or releasing the gas through piston movement. The circular structure of the gas lift has the following characteristics:

1. Sealing and Safety: The cylindrical housing is made of high-strength steel or aluminum alloy, and the internal sealing ring design ensures no gas leakage. It also passes international standard certifications (such as BIFMA, SGS) to ensure safety during use.
2. Load-Bearing and Stability: The diameter is usually 50-80mm, and it is classified into different grades (such as Grade 2, Grade 3, Grade 4) according to load-bearing requirements, capable of bearing 100-200kg of weight to meet the needs of users with different body types.
3. Operational Convenience: The internal valve of the gas lift is triggered by the height adjustment lever below the chair surface for quick adjustment. The circular design facilitates matching with the chair surface connectors and reduces structural stress concentration.

Base Design: Diverse Applications of Circular Elements

The base is the key structure connecting the gas lift, chair legs, and chair surface, and its circular design is mainly reflected in the following scenarios:

1. Circular Base: Some office chairs adopt an overall circular base design, directly connected to the gas lift, creating a simple and smooth visual effect. This type of design is commonly seen in modern minimalist-style chairs and is suitable for open office environments.
2. Circular Connections in Five-Star Swivel Base: Traditional swivel chair bases are often equipped with five-star chair legs, with casters installed at the end of each leg. The core connection parts are still circular: the gas lift is inserted into the circular sleeve in the center of the base, enabling 360-degree rotation through bearings; the connection points between the five-star legs and the base also adopt circular reinforcement designs to distribute pressure and enhance stability.
3. Functional Integration: The circular base can integrate functional modules such as tilt locking and height adjustment. For example, knobs or sliders are set on the edge of the base, allowing users to adjust the backrest angle or seat depth by rotating or sliding operations. The circular layout makes the operations more ergonomic.

Summary: The circular elements in an office chair base include not only the functional cylinder of the gas lift but also the connection designs between the base and chair legs. The circular structure has become a common choice in office chair design by optimizing mechanical distribution and enhancing operational convenience, while also meeting safety and aesthetic requirements.