Chair Office Chair Spring

The application of springs in office chairs mainly falls into two categories: support springs and gas springs (pneumatic rods), which are used to enhance comfort and adjustability respectively.

1. Support Springs: Dynamic Body Fit, Alleviating Fatigue from Prolonged Sitting
Some office chairs incorporate spring structures into their lumbar supports or seat cushions to achieve dynamic support. For example, the enova office chair uses extension springs in its four-dimensional floating lumbar support, with the core function of adjusting support intensity in real-time based on lumbar pressure. When the user leans back, the springs compress, and the lumbar support actively conforms to the lumbar curve; when the user leans forward, the springs rebound to provide continuous support, preventing the lumbar region from being left unsupported. This design effectively disperses lumbar pressure and reduces back pain caused by prolonged sitting. Additionally, the full sacral support emphasized by the Sihoo B100Pro office chair, although not explicitly mentioning the type of spring, is speculated to achieve precise sacral support through a spring array or elastic structure, further enhancing spinal support.

2. Gas Springs (Pneumatic Rods): Enabling Seat Height and Tilt Adjustment
Gas springs are common height and tilt adjustment mechanisms in office chairs, essentially being high-pressure pneumatic rods. Their working principle involves filling the interior with high-pressure nitrogen gas and regulating the connectivity between two gas chambers through a control valve. When the valve is opened, gas drives the piston rod to extend or retract under pressure differentials, enabling stepless height adjustment or recline locking of the seat. For example, when a user presses the adjustment lever beneath the seat, the valve opens, and the gas spring automatically balances the height based on the user's weight; upon release, the valve closes, and the seat remains fixed at the current position. This design not only offers convenient operation but also accommodates the needs of users of different heights, enhancing usability flexibility.

3. Spring Material and Safety Considerations
Springs used in office chairs must meet fatigue resistance and stability requirements. Support springs are typically made of high-carbon steel or stainless steel, with heat treatment processes enhancing their elasticity and resistance to deformation; gas springs must pass international safety certifications (such as BIFMA standards) to ensure the airtightness of internal gases and the reliability of piston structures, preventing safety hazards caused by gas leaks or explosions. Furthermore, the layout and quantity of springs must undergo ergonomic testing to balance support force and comfort, avoiding excessive local pressure.