US PATENT SUBCLASS 175 / 389
.~.~ Impact 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}
389.~.~ Impact type {1}
390  DF  .~.~.~> Plural larger diameter steps

DEFINITION

Classification: 175/389

(under subclass 385) Apparatus in which the cutting edges of the bit are of the type which disintegrate the formation by percussive action.

SEE OR SEARCH THIS CLASS, SUBCLASS:

346+, for an impact type bit, per se.