US PATENT SUBCLASS 175 / 265
.~ Plural cutter elements longitudinally relative movable into transverse alignment

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}
265.~ Plural cutter elements longitudinally relative movable into transverse alignment

DEFINITION

Classification: 175/265

(under subclass 263) Apparatus in which a plurality of cutter elements are provided, 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:

259, for similar cutter elements which are also removable or insertable around or through a driving or driven shaft or casing while the shaft or casing is below ground.