| 摘要 |
A gas cylinder is provided to allow a user to select a wanted function out of a function of enabling both rotation and height adjustment of a magnet and a function of enabling height adjustment of the magnet without rotating the magnet. A gas cylinder(100) comprises a spindle(130) vertically performing a reciprocating motion according to height adjustment, a cylinder which is mounted on an inner part of the spindle, and in which gas is filled, a piston member dividing an inner part of the cylinder into upper and lower parts, a valve member sealing the top of the cylinder and controlling coming and going of the gas filled in the cylinder, a sleeve(180) formed to surround at least a portion of an outer peripheral surface of the spindle, a spindle guide(120) onto which at least a portion of the sleeve is inserted, and a tightening member(190) adjusting a spaced distance between the sleeve and the spindle.
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