Floating offset transmitter housing underground directional drilling tool
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United States of America Patent
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-
Mar 2, 2004
Grant Date -
N/A
app pub date -
Apr 30, 2002
filing date -
Apr 30, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The subject matter of this invention is an underground directional drilling tool which is particularly effective in drilling rock and highly compacted soil formations. This tool is an improvement upon the tool developed by Applicants and patented in U.S. Pat. No. 6,050,350. The current invention utilizes ball bearings contained within subassemblies positioned at each end of the steering tool. This allows the steering tool to float upon the subassemblies as the inner core and drive shaft rotate within the subassemblies and steering tool, thereby reducing rotational torque transfer from the drill string, subassemblies and drive shaft to the housing of the directional drilling tool. The use of the ball bearing containing subassemblies improves underground stability and, thus, steerability during the forward drilling operation. Further, these improved features reduce wear thereby increasing durability of the tool which is used in the harsh underground environment.
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