US PATENT SUBCLASS 175 / 258
.~ Laterally shiftable cutter element movable through shaft

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

257  DF  TOOL REMOVABLE OR INSERTABLE THROUGH OR AROUND DRIVING OR DRIVEN SHAFT OR CASING {2}
258.~ Laterally shiftable cutter element movable through shaft {2}
259  DF  .~.~> Plural cutter elements longitudinally relatively movable into transverse alignment
260  DF  .~.~> Cutter element engages torque transmitting abutment on shaft when expanded {1}

DEFINITION

Classification: 175/258

(under subclass 257) Apparatus in which the tool comprises a laterally shiftable cutter element (as defined in subclass 263) movable through the inside of a tubular shaft.