Office Chair Base

The office chair base is the core component of an ergonomic chair, directly affecting the chair's tilt support, recline angle, and adjustment functions, thereby determining user comfort. Depending on the design differences, bases can be classified into the following types:

1. Fixed Base
Priced mostly below 500 yuan, commonly found in bar stools or basic height-adjustable chairs. Its function is limited to adjusting the seat height and cannot achieve recline or seat depth adjustments. It requires manual lever operation. Due to its simple structure, comfort is average, but it is cost-effective and suitable for scenarios with limited budgets or low functional requirements.

2. Single-Spring Base
Priced between 500-1000 yuan, mostly used in ordinary office chairs. It adds a recline function to the fixed base, but the spring tension adjustment is stiff. Lighter individuals may find it difficult to 'push down' due to excessive recline resistance, limiting seating comfort.

3. Dual-Spring Base
Priced above 1000 yuan, commonly found in entry-level ergonomic chairs. It achieves multi-position adjustments by adding an auxiliary spring, effectively improving uneven recline resistance and providing a smoother recline experience, suitable for users with basic comfort requirements.

4. Adaptive Gravity Base
Priced above 1000 yuan, used in Yongyi series seats, Tech堡垒 gaming chairs, etc. It employs adaptive technology jointly developed by Yongyi and the Zhejiang University Engineering Laboratory, automatically sensing the required recline force based on body weight. It supports a large recline angle range of 95°-138° and four-level recline adjustments, integrating multiple functions such as seat depth, seat height, and recline adjustments, balancing personalization and convenience.

5. Dual Fiberglass Base
Priced above 3000 yuan, positioned as high-end ergonomic chairs. It replaces traditional torsion springs with fiberglass materials, providing more even force distribution and a smooth seating experience. However, domestic technology varies, and some products may have a risk of breakage. To extend service life, the recline angle may be sacrificed, requiring careful brand selection.

Supplementary Information on Component Prices
Prices for base-related components vary widely. For example, aluminum alloy trays range from 18-47 yuan; thickened swivel chair base electroplated five-star leg frames cost about 13.16 yuan; and office chair electroplated five-star leg frames cost about 23.75 yuan. When purchasing, consider both budget and functional requirements comprehensively.