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Title:
TAPERED THREAD CONFIGURATION WITH IMPROVED DURABILITY
Document Type and Number:
WIPO Patent Application WO/2012/074984
Kind Code:
A3
Abstract:
Underground drilling operation often requires connecting a drill tool (e.g., drill bit, backreamer, etc.) to a drill string. It is desirable to connect the drill tools to a drill string in a manner that facilitates quick and easy assembly and disassembly. Low torque coupling, commonly referred to as "torque-less" connection, can provide such functionality. The useful life and strength of such connections can be improved upon. The present disclosure provides a low torque coupling with improved strength and durability.

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WO/1993/009375HIGH TORQUE TOOL JOINT
Inventors:
LANGENFELD MICHAEL D (US)
RUNQUIST RANDY R (US)
Application Number:
PCT/US2011/062356
Publication Date:
October 04, 2012
Filing Date:
November 29, 2011
Export Citation:
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Assignee:
VERMEER MFG CO (US)
LANGENFELD MICHAEL D (US)
RUNQUIST RANDY R (US)
International Classes:
E21B17/042; F16L15/00
Domestic Patent References:
WO2008057145A22008-05-15
Foreign References:
US20050189147A12005-09-01
US20060078372A12006-04-13
US20050224259A12005-10-13
Other References:
See also references of EP 2646645A4
Attorney, Agent or Firm:
KOWALCHYK, Katherine, M. (P.O. Box 2903Minneapolis, MN, US)
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