US PATENT SUBCLASS 175 / 392
.~.~ Leading portion is forked rotary type


Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use



175 /   HD   BORING OR PENETRATING THE EARTH

327  DF  BIT OR BIT ELEMENT {21}
385  DF  .~ Bit with leading portion (e.g., pilot) forming smaller diameter initial bore {6}
392.~.~ Leading portion is forked rotary type


DEFINITION

Classification: 175/392

(under subclass 385) Apparatus comprising a rotary bit in which the leading or pilot portion is provided with two or more axially extending branches terminating in cutting edges.

SEE OR SEARCH THIS CLASS, SUBCLASS:

387, for bits having a core forming leading portion, and generally defining axial leading branches.

421, and the search there noted for bits having axially extending branches terminating in cutting edges.