| 摘要 |
<p>An improved descent device including a rotating spool on which are wound cables 34 and 35 is provided with a fluid rotation-retarding means having a plurality of vane members mounted for rotation in fluid-filled chamber 12. Each vane member is comprised of a vane shell 23 receiving a vane core 22 which is normally biassed in a radially inward direction and is extensible from the vane shell 23 by centrifugal force. The retarding force depends on the contact surfaces between the vane members and the fluid 10 which vary with centrifugal force.</p> |
