US PATENT SUBCLASS 175 / 82
.~ Guide carried by shaft to operative position

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

79  DF  TOOL SHAFT ADVANCED RELATIVE TO GUIDE INSERTABLE IN INACCESSIBLE HOLE TO CHANGE DIRECTION OF ADVANCE {3}
82.~ Guide carried by shaft to operative position {1}
83  DF  .~.~> With clutch means acting between shaft and guide

DEFINITION

Classification: 175/82

(under subclass 79) Apparatus in which the means changing the direction of advance is supported by the tool shaft and moved into an operative position in the hole thereby.