US PATENT SUBCLASS 175 / 259
.~.~ Plural cutter elements longitudinally relatively movable into transverse alignment

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  DF  .~ Laterally shiftable cutter element movable through shaft {2}
259.~.~ Plural cutter elements longitudinally relatively movable into transverse alignment

DEFINITION

Classification: 175/259

(under subclass 258) Apparatus in which a plurality of cutter elements are movable through the shaft, said cutter elements being movable relative to each other in the direction of the longitudinal axis of the shaft to an operative position in which the cutting edges of the cutter elements lie in the same transverse plane perpendicular to the longitudinal axis of the shaft.

SEE OR SEARCH THIS CLASS, SUBCLASS:

265, for plural laterally shiftable cutter elements, per se, which are longitudinally relatively movable into transverse alignment.