US PATENT SUBCLASS 175 / 272
.~ Cutter element shifted by relatively longitudinally movable threaded elements

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

263  DF  CUTTER ELEMENT LATERALLY SHIFTABLE BELOW GROUND (E.G., EXPANSIBLE) {13}
272.~ Cutter element shifted by relatively longitudinally movable threaded elements

DEFINITION

Classification: 175/272

(under subclass 263) Apparatus in which the laterally movable cutter element is connected to a pair of elements having cooperating screw threaded portions, said elements being relatively movable in a direction parallel to the longitudinal axis of the shaft due to the action of the screw threads to cause the cutter element to move laterally.