Adjustable Stool Office Chair
An adjustable chair is a functional seat that adjusts the height of the seat plate through a lifting and positioning device. Common types include pneumatic, hydraulic, and mechanical models. The following provides an introduction from three aspects: working principles, structural components, and typical products.
Working Principles
Pneumatic adjustable chairs use high-pressure nitrogen gas cylinders to achieve smooth lifting and lowering. The change in gas pressure inside the cylinder drives piston movement, which in turn adjusts the height of the seat plate. This design ensures a stable lifting process and easy operation, making it the most widely used type on the market. Hydraulic chairs control height through pressure principles, utilizing the pressure transmission characteristics of liquids in a sealed container. They achieve seat plate lifting and lowering through devices such as hydraulic pumps, with a relatively slow lifting process but strong stability. Mechanical adjustable chairs rely on mechanical structures such as gears and screws for height adjustment, usually requiring manual operation. They have a simple structure but lower adjustment precision.
Structural Components
The core components of an adjustable chair include the seat plate, backrest, frame, frame rocker arm, lifting and positioning device, and chair legs. The seat plate directly bears the weight of the human body and is usually designed with ergonomics in mind to enhance comfort. The backrest provides lumbar support, and some high-end products, such as the JD.COM Jingzao Z5 Pro ergonomic chair, are equipped with an adjustable backrest to precisely find the comfortable support zone. The frame and chair legs are connected through the frame rocker arm, which rotates up and down around the hinge axis to achieve lifting and lowering. This design ensures stability during the lifting process. The lifting and positioning device is a key component responsible for fixing the height of the seat plate to ensure safety during use.
Typical Products
Take the Sihoo M90 ergonomic chair as an example. Its seat height can be adjusted within the range of 45 - 55 cm to meet the needs of users of different heights. The JD.COM Jingzao Z5 Pro ergonomic chair is equipped with a 50mm adjustable backrest. By adjusting the height of the backrest, users can find the most suitable lumbar support position for themselves, effectively relieving fatigue from prolonged sitting. These products fully consider ergonomic principles in their design and enhance user comfort through precise adjustment functions, making them representative products in the field of adjustable chairs.
