US PATENT SUBCLASS 175 / 355
.~.~ Circumferentially displaced cutter axes

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}
355.~.~ Circumferentially displaced cutter axes {3}
356  DF  .~.~.~> Stub axle only
357  DF  .~.~.~> Detachable multiaxis support or spider
358  DF  .~.~.~> Mutually contacting cutter supports {1}

DEFINITION

Classification: 175/355

(under subclass 331) Apparatus comprising a plurality of rolling cutter elements in which the axis of one cutter element lies in a diametric plane containing the bit axis while the axis of another cutter element is disposed in a plane which is displaced from said diametric plane through an angle measured in a plane perpendicular to the bit axis.