US PATENT SUBCLASS 175 / 352
.~.~.~.~ Plural coaxial cutters


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

327  DF  BIT OR BIT ELEMENT {21}
331  DF  .~ Rolling cutter bit or rolling cutter bit element {26}
350  DF  .~.~ Laterally offset cutter axis {2}
351  DF  .~.~.~ Disk blade {1}
352.~.~.~.~ Plural coaxial cutters


DEFINITION

Classification: 175/352

(under subclass 351) Apparatus in which an additional rolling cutter element is mounted generally coaxially with the disk cutter.

(1) Note. The additional cutter may be a disk or a toothed cutter and may rotate either with respect to or in unison with the disk cutter, (e.g., integral coaxial or spool cutters).