| 摘要 |
A gas spring comprising a cylinder having a closed end and an open end with the rod of a piston projecting into the cylinder through the open end and a sealing assembly surrounding the rod adjacent the open end of the cylinder and normally sealing the interior of the cylinder from the surrounding atmosphere. The sealing assembly includes an annular resilient sealing member having surfaces which are in sealing engagement with the rod and the inner wall of the cylinder and a plurality of protuberances are formed on the inner wall of the cylinder and are located inwardly of the normal position of the sealing member. When the open end of the cylinder is placed in communication with a gas under pressure, the gas moves the sealing member into engagement with the protuberances so that openings are formed between the member and the inner wall of the cylinder and the gas flows into the cylinder through these openings. When the pressure source is removed, the pressurized gas in the cylinder forces the sealing member back to its normal position and, in this position, the member seals the interior of the cylinder from the outside.
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