How to adjust the height of the stool
Gas lift is now the most common, is like a bar, is a lifting seat by hand paddles below can reach the place, most of them are pressed and sat on the stool is reduced, stand up is increased. There is also a barber shop, the need for repeated trampling of the back of the control rod. Mechanical has been few, there are mainly spiral and plug two. The spiral may still appear in the hospital, it is a big screw, the rotating chair surface can move up and down. The insertion rod is simpler and is adjusted to the proper position
This problem is very difficult ah ~ ~ type stool to the more, I know the current used, is roughly two kinds of pneumatic lifting, lifting machinery.