US PATENT SUBCLASS 175 / 242
.~.~ Pivot transverse to tool axis

Current as of: June, 1999
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175 /   HD   BORING OR PENETRATING THE EARTH

232  DF  WITH MEANS MOVABLE RELATIVE TO TOOL BELOW GROUND TO STOP FLOW TOWARD BORE BOTTOM {8}
241  DF  .~ Stops flow by movement about fixed pivot {1}
242.~.~ Pivot transverse to tool axis

DEFINITION

Classification: 175/242

(under subclass 241) Apparatus in which the pivot point comprises an axis which is substantially transverse to the axis along which the tool is forming a bore.