Adjustable Office Chair - Fixed Chair

The fixed chair among adjustable office chairs refers to a type of chair where the seat height can be adjusted, but the chair legs or part of the structure is fixed to enhance stability. Its core features include structural functionality, safety design, price and brand differences, as well as installation and maintenance points.

I. Structural and Functional Characteristics

1. Height Adjustment Mechanism
   Fixed chairs typically employ a pneumatic height adjustment system, achieving height regulation through the extension and retraction of the piston rod inside the cylinder. The cylinder is filled with high-purity nitrogen (concentration ≥ 90%) at a pressure of approximately 1-2 atmospheres, with a sealing ring to prevent gas leakage. Some models (such as the B100pro) support seat cushion height adjustment, multi-directional armrest adjustment, and reclining lock functions to meet different sitting posture needs.

2. Material and Stability Design
   The chair body is mostly made of steel, mesh fabric, or metal materials, with fixed chair legs (such as a five-star base). Some models are equipped with explosion-proof steel plates to reduce the risk of pneumatic rod explosions. The chassis and backrest are fixed with screws to ensure overall structural stability. Some high-end models integrate ergonomic designs, such as rotatable armrests, adjustable headrests, or footrests (which require screws to connect to the seat cushion).

II. Safety and Maintenance Points

1. Safety Risks of Pneumatic Rods
   Poor-quality pneumatic rods may explode due to insufficient nitrogen purity, thin tube walls, or frequent height adjustments. When purchasing, ensure that the product has passed safety certifications (such as SGS, BIFMA) and avoid disassembling it yourself or exposing it to high-temperature environments.

2. Regular Inspection and Maintenance
   It is recommended to inspect the pneumatic rod's sealing every six months, checking for gas leaks or unusual noises. If you notice height adjustment stuttering or abnormal sinking speed, stop using it immediately and contact after-sales service.

III. Market Prices and Brand Selection

1. Price Range
   Basic staff chairs cost around 130 yuan, while professional adjustable chairs (such as those with integrated ergonomic designs) can reach 1900 yuan. Common brands include Beiwei, Deli, and Maiya, with some models supporting customization (such as stadium referee chairs).

2. Purchase Recommendations
   Choose products based on usage scenarios (such as office or home) and budget. For office scenarios, it is advisable to prioritize models with explosion-proof steel plates and multi-directional adjustment functions; for home use, focus on comfort (such as mesh fabric and rotatable armrests).

IV. Typical Installation Steps (Taking the B100pro as an Example)

1. Assembly Sequence
   Install the chair legs → pneumatic rod → back connecting rod → seat cushion → armrests → backrest → headrest in sequence, using M8 screws and a hex wrench to fix each component.

2. Function Debugging
   After installation, test the seat cushion height adjustment, armrest adjustment, and reclining lock functions to ensure that all components are firmly connected and free of unusual noises.