Office Chair Fixation Principle

The fixation principle of office chairs is achieved through various methods such as adjustment rods/pneumatic rods, screws, simplified structural designs, and pressure dispersion by five-claw bases, depending on their type and structural differences.

1. Fixation by Adjustment Rods or Pneumatic Rods
   This is the most common fixation method for height-adjustable office chairs. Manually adjustable chairs achieve height locking through adjustment rods or pneumatic rods beneath the seat. When users operate the adjustment rod (e.g., pulling up and then pressing down) or the pneumatic rod (e.g., lifting and then releasing), the internal mechanical structure or high-pressure gas is compressed, forming a stable supporting force. The pneumatic rod is filled with inert gases such as nitrogen, and the gas flow is controlled by a sealed piston to ensure that the chair does not easily sink under external force at the selected height. This design balances ease of adjustment with long-term stability and is widely used in modern office settings.

2. Fixation by Screws
   Some traditional or customized office chairs use screws to fix the height. The seat bottom is equipped with adjustable fixing screws. Users need to loosen the screws, manually adjust the seat to the target height, and then tighten the screws to lock the position. Screws fix components through mechanical friction, offering a simple structure but relying on user operational precision. If the screws are not fully tightened, the chair may slowly sink during use, requiring regular inspection and maintenance. This design is commonly found in scenarios sensitive to cost or requiring frequent height adjustments.

3. Fixed Structural Design
   For short-term use or scenarios requiring a unified posture (e.g., conference rooms, training rooms), some office chairs achieve fixation through simplified structures. For example, fixed armrests are integrated with the seat or backrest without movable joints, reducing wear risks; or the height adjustment function is omitted entirely, with rigid connections ensuring long-term stability of components. Although these chairs lack flexibility, their simple structure and low failure rate make them suitable for environments where stability is prioritized over functionality.

4. Pressure Dispersion by Five-Claw Base
   The five-claw base is the core load-bearing structure of office chairs, forming a stable triangular support system through five evenly distributed contact points with the ground. Its design principle lies in dispersing human body weight and dynamic forces (e.g., posture adjustments, standing up) to prevent tipping due to excessive pressure on a single point. High-quality five-claw bases are made of high-strength materials (e.g., nylon, steel) and are equipped with non-slip wheels or fixed foot pads to further enhance stability. Even if the chair is height-adjustable, the pressure dispersion design of the base indirectly ensures overall fixation.