US PATENT SUBCLASS 175 / 80
.~ Tool telescopes over guide having surface set at angle in hole

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}
80.~ Tool telescopes over guide having surface set at angle in hole

DEFINITION

Classification: 175/80

(under subclass 79) Apparatus in which the means changing the direction of advance comprises a rod or mandrel having a shaft engaging surface which is set in the hole at an angle to the original direction of advance, the shaft receiving the rod or mandrel in a telescoping relationship to be guided in a different direction thereby.