Apparatus for controlled stabilized descent
作者： Steven L. Overby , David R. Benjamin
DOI:
关键词: Descent (aeronautics) 、 Structural engineering 、 Boom 、 Suspension (vehicle) 、 Trailer 、 Mechanical engineering 、 Engineering
摘要: An apparatus for descent, suspension and retrieval of a worker through an opening in the ground includes trailer having boom assembly mounted thereon is described. The telescopically extensible retractable members that are extended downwardly by action gravity to subsurface location. supported stabilized manner during suspension, retraction members.
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