| 摘要 |
PURPOSE: A gas spring is provided to facilitate the operation of a valve pin with low power as the valve pin is operated regardless of the gas pressure of the cylinder inside. CONSTITUTION: A gas spring is constituted as follows. A packing groove(32) is formed on the external periphery of a first piston(30). A second chamber path is formed on a first chamber path(25) of the upper rim(30a) of the packing groove and a lower rim(30b). Paths(G1,G2) are opened and closed among the upper and the lower rim and a cylinder body by a packing(36) which is inserted into the packing groove. A second rod(50) which is coupled with the first rod is formed smaller than the diameter of the first rod and passes through the second piston to be exposed to the outside of the body.
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