Office Chair Spring Chair

The core component of an office chair spring chair is the gas spring (pneumatic rod), and its types, structure, working principle, and safety are as follows:

Types of Gas Springs

Gas springs are key components that enable the lifting function of spring chairs. Common types include:

1. Compression Gas Springs: These generate elastic force by compressing gas and are mainly used for support or cushioning scenarios.
2. Lockable Gas Springs: These can be locked at any position and are suitable for scenarios requiring a fixed height.
3. Seat Lifting Gas Springs: Specifically designed for seats, these support height adjustment and are commonly used in ergonomic chairs and swivel chairs.
4. Tension Gas Springs: These achieve their function through stretching actions and have relatively fewer application scenarios.
   Among them, the elastic-locking seat lifting gas spring is the core configuration for ergonomic chairs and common swivel chairs, offering both lifting and locking functions.

Structure of Gas Springs

From the outside in, a gas spring consists of:

1. Standing Cylinder (Outer Shell): The outermost protective structure that prevents external damage.
2. Outer Cylinder: Encloses internal components and provides additional protection.
3. Cylinder Tube (Inner Cylinder): Seals high-pressure gas and is the core part for pressure bearing.
4. Piston: Composed of a piston rod and piston top, it changes the volume of the gas chamber through movement to achieve lifting control.

Working Principle

Gas springs drive lifting through pressure differences:

• Lifting Process: After pressing down the activation rod, the valve opens, connecting the gas chambers on both sides of the piston head, equalizing the pressure. Since the effective受力 (force-bearing) area of the piston top is larger than that of the bottom, gas pressure pushes the piston upward, achieving seat lifting.
• Lowering Process: Under external force (such as human weight), the piston moves downward, compressing the gas and achieving smooth lowering by offsetting the pressure difference.

Safety and Certification

The safety of gas springs depends on their strength rating and certification:

• Certification Standards: Pneumatic rods with EN16955 rating certification issued by authoritative institutions such as SGS and TUV are reliable in strength.
• Rating Classification: Class 3 and Class 4 pneumatic rods are high-safety ratings and can be used with confidence.
• Verification Method: Certification information is usually engraved on the exposed steel tube of the pneumatic rod, and users can confirm product compliance by checking the标识 (markings).

Summary: The gas spring of a spring chair achieves lifting function through a precise structure and pressure difference principle. Choosing Class 3 or Class 4 pneumatic rods that have passed authoritative certification ensures safety in use.