| 摘要 |
A gas spring (310) for forming equipment. A casing (312) includes an axially extending side wall (320), an open end, a transversely extending closed end wall (322) axially spaced from the open end (324), and a pressure chamber (317) established in part by the side and end walls (320) to receive a gas under pressure. A piston rod (316) is received at least partially in the casing for reciprocation between extended and retracted positions. A piston rod housing (344) is received at least in part in the casing between the piston rod and the casing. An overtravel pressure relief feature (318) includes a vent path that is disposed between the pressure chamber and the outside of the gas spring and that includes a vent passage (363) through the side wall of the casing and a seal that sealingly interrupts the vent path, wherein displacement of the housing into the casing results in opening of the vent path. |
