Compact hoist for drilling or workover rig
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United States of America Patent
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N/A
Issued Date -
Aug 17, 2006
app pub date -
Jan 13, 2005
filing date -
Jan 13, 2005
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
The present invention provides a compact hoist system for use on a drilling or workover rig. The present invention eliminates problems related to chain failures in hoist systems by incorporating wire rope in a vertically and horizontally compacted arrangement to provide maximum vertical lift capacity and improved versatility. Caterpillar bearings, wire rope tension equalizing sheaves and a winch coupled to a axially movable spiral-grooved drum are combined to provide a system that enables cantilever jack-up rigs to handle blow-out preventer stacks of increased height and size.
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