Drilling rig breakout wrench system
Patent
·
OSTI ID:6462709
A breakout wrench utilized on a drilling rig to break open threaded joints of drill pipe sections in either direction is described comprising: a body member including - extension arm means which is pivotally attached to the drilling rig allowing the wrench to be swung out of its working position on the drilling rig; an inside cam surface on the body; a plurality of locking cogs positioned inside the cam surface, each cog being rotatably journaled on a shaft with a loose fit allowing the cogs limited lateral movement; extended arcuate surface means on the cam surface partially surrounding each locking cog, allowing outward lateral movement of the cogs so a drill pipe section can freely pass between the cogs, and; side plate means on the side of the body member supporting the cog shafts, the side plate means including a handle for rotation of the side plate means relative to the body causing the locking cogs to engage the extended arcuate surface of the cam surface and move inwardly into gripping engagement with the drill pipe section.
- Assignee:
- Straightline Manufacturing, Inc., Newton, KS (United States)
- Patent Number(s):
- A; US 5231899
- Application Number:
- PPN: US 7-995955
- OSTI ID:
- 6462709
- Country of Publication:
- United States
- Language:
- English
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