Office Chair Base Cylinder

The professional name for the cylinder at the base of an office chair is a gas lift, also known as a gas spring or pneumatic rod.

Core Function

The core function of a gas lift is to enable stepless adjustment of the seat height. Users can easily adjust the seat to a comfortable position based on their own height and the height of the desk, meeting usage needs in different scenarios.

Working Principle

The working principle of a gas lift is based on the high-pressure nitrogen gas inside. There is a piston inside the cylinder that divides the internal space into upper and lower parts. Due to the presence of the piston rod, the force-bearing areas on the upper and lower sides of the piston are different, generating an upward thrust under the action of the high-pressure nitrogen gas. When a person sits on the chair, their body weight overcomes the thrust, causing the lifting shaft to descend smoothly. When the person stands up and the pressure is removed, the gas thrust pushes the lifting shaft back up, completing the lifting cycle. This design makes the seat lifting process smooth and effortless, without the need for manual operation of complex mechanical structures.

Additional Functions

Some advanced models of gas lifts are equipped with knobs. Users can rotate these knobs to adjust the tightness of the backrest's recline. This function allows users to adjust the support force of the backrest according to their personal preferences and usage habits, enhancing comfort.

Safety Issues and Purchase Recommendations

Poor-quality or aged gas lifts pose safety risks and, in extreme cases, may lead to serious accidents such as explosions. Therefore, when purchasing a gas lift, the following points should be noted:

• Check the stamp: Regular products usually have production information and quality certification marks stamped on the gas lift.
• Pay attention to safety ratings: Choose products that meet international or domestic safety standards, such as gas lifts certified by BIFMA or EN1335.
• Listen to the knocking sound: A high-quality gas lift produces a clear sound when knocked, while a poor-quality one sounds dull.
• Choose a reputable brand: Gas lifts from well-known brands offer better quality and after-sales service guarantees.

Daily Usage Precautions

To ensure the safe use of a gas lift, the following daily precautions should be taken:

• Avoid subjecting the chair to severe impacts or lateral forces to prevent damage to the internal structure of the gas lift.
• Do not frequently use the chair beyond its designed weight limit to avoid accelerating the aging of the gas lift.
• Regularly check the gas lift for oil stains or abnormal shaking, and replace it promptly if any problems are found.