Office Chair, Lifting Chair, Chair
The lifting chair among office chairs is a functional seat that adjusts the height of the seat plate through a lifting and positioning device. Common types include pneumatic, hydraulic, mechanical, and screw-type chairs.
Types and Principles Pneumatic lifting chairs use high-pressure nitrogen gas cylinders to achieve smooth lifting and lowering, adjusting height through changes in gas pressure within the cylinder. They are characterized by easy operation and rapid response. Hydraulic chairs rely on the principle of liquid pressure, using a hydraulic pump to control the flow of oil for height adjustment. Their structure is relatively complex but offers high stability. Mechanical chairs typically employ mechanical structures such as gears and threads, adjusting height through manual rotation or lever manipulation. They are highly durable but have lower adjustment precision. Screw-type chairs achieve lifting and lowering through screw springs or threaded rods and are commonly found in simple seats.
Structural Composition The core components of a lifting chair include the seat plate, backrest, frame, frame rocker arm, lifting and positioning device, and chair legs. The frame and chair legs are connected via the frame rocker arm, which pivots around a hinge axis to enable lifting and lowering. The lifting and positioning device is a crucial part, with different positioning mechanisms for various chair types: pneumatic chairs use cylinder lock valves to fix height, hydraulic chairs rely on hydraulic valves to control oil flow, and mechanical chairs achieve positioning through gear engagement or thread locking.
Safety and Usage Pneumatic lifting chairs may pose an explosion risk if inferior pressure rods are used (e.g., insufficient nitrogen purity or thin tube walls). Therefore, it is essential to choose products with SGS, TUV, or other safety certifications and confirm the presence of protective designs such as explosion-proof steel plates. During use, avoid frequent lifting and lowering, overloading, or disassembling the pressure rod independently to prevent accidents caused by abnormal internal pressure. Hydraulic and mechanical lifting chairs are relatively safer but still require regular inspection for hydraulic oil leakage or mechanical structure wear.
Example References The Jingdong Jingzao Z5 Pro ergonomic chair is equipped with a 50mm adjustable backrest, supporting multiple height adjustments to match different body types. The Sihoo M90 ergonomic chair has a seat height adjustment range of 45-55cm, suitable for various desk heights. Both products adopt pneumatic lifting designs but significantly reduce usage risks by optimizing cylinder structures and adding safety protections.
