| 摘要 |
An improved descent device including a rotating spool on which is wound a cable is provided with a fluid rotation-retarding means having a plurality of vane members mounted for rotation in a fluid-filled chamber. The vane member is comprised of a vane shell receiving a vane core which is normally biassed in a radially inward direction and is extensible from the vane shell by centrifugal force. The retarding force depends on the contact surfaces between the vane members and the fluid which vary with centrifugal force.
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