Self-leveling bottom block assembly
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United States of America Patent
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Jun 21, 2011
Grant Date -
May 22, 2008
app pub date -
Nov 21, 2007
filing date -
Nov 22, 2006
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A bottom block assembly includes a block having a central vertical axis, a hook secured to the block for attaching a load to the block, a first pair of sheaves rotatably attached to the block, a first rope reeved about the first pair of sheaves, a second pair of sheaves rotatably attached to the block, and a second rope reeved about the second pair of reeves. The first and second pairs of sheaves are each equally spaced about the central vertical axis. The first pair of sheaves are located higher on the block than the second pair of sheave so that a portion of the first rope located between the first pair of sheaves crosses over a portion of the second rope located between the second pair of sheaves. If either rope fails, the other rope ensures the block remains level with a full load attached to the hook.
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