US PATENT SUBCLASS 175 / 357
.~.~.~ Detachable multiaxis support or spider

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  DF  .~.~ Circumferentially displaced cutter axes {3}
357.~.~.~ Detachable multiaxis support or spider

DEFINITION

Classification: 175/357

(under subclass 355) Apparatus in which all of the cutter elements are journaled on a separate axle or pin supported by a frame, bracket, or securing means which is readily detachable from the bit head in such manner that all of the axles or pins may be detached simultaneously.