| 摘要 |
An extendable/retractable link apparatus 10 defines a fluid passage therethrough and may be connected between two relatively moveable components, e.g. an aircraft ejector seat and the adjacent fixed airframe, so that, when there is relative movement within pre-set limits, there is no significant displacement of fluid and no significant pressure force generated. The apparatus comprises a body 12 defining a fluid inlet/outlet port 16 and slidably receiving a piston 18 having a central bore which defines a fluid inlet/outlet port 24. The fluid passage is defined between said inlet and outlet ports 16 and 24. Relative movement of the piston 18 and the body 12 does not cause significant displacement of the fluid into or out of the fluid passage.
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