The reason why the swivel chair can be raised and lowered is that there is a bar in the lifting device. The bar is a kind of elastic element that uses gas and liquid as the working medium and can support, buffer, brake, adjust the height and adjust the angle. The basic principle is filled with high-pressure nitrogen inside, due to a through-hole in the piston, both ends of the piston gas pressure equal, and the cross-sectional area of the piston on both sides are different, one end connected to the piston rod and the other end, under gas pressure , Resulting in a small cross-sectional area of the side of the pressure, that is, the pressure bar elastic, people sit up to the lifting shaft pressure, the lifting shaft to gently decline, the speed is uniform, can be reduced to the lowest point. Do not give the lifting shaft force, lifting shaft back to the highest point.
The gas spring with the release of the device can be anywhere in the stop to stop, and after stopping a lot of locking force (up to 10000N).