US PATENT SUBCLASS 175 / 344
.~.~ Noncutting portion forwardly of rolling cutter (e.g., reamer)

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}
344.~.~ Noncutting portion forwardly of rolling cutter (e.g., reamer) {1}
345  DF  .~.~.~> Longitudinal axis cutter {2}

DEFINITION

Classification: 175/344

(under subclass 331) Apparatus in which the rolling cutter element is carried on a bit having a portion extending inwardly toward the axis of the bit and forwardly of the cutter element in the direction of boring and which has no cutting function.

(1) Note. The noncutting portion can be located between claimed cutting portions and patents which claim cutting portions spaced longitudinally of the bore axis will be classified in this subclass even though no noncutting portion is specifically recited.

SEE OR SEARCH THIS CLASS, SUBCLASS:

295, for a device having a noncutting portion forwardly of a sleeve impact member having a cutting portion thereon.

406+, for a bit having a noncutting portion forwardly of the cutting portion and in which the cutting portion is a nonrolling cutter.