US PATENT SUBCLASS 175 / 394
.~ With helical-conveying portion


Current as of: June, 1999
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175 /   HD   BORING OR PENETRATING THE EARTH

327  DF  BIT OR BIT ELEMENT {21}
394.~ With helical-conveying portion {1}
395  DF  .~.~> Impact type


DEFINITION

Classification: 175/394

(under subclass 327) Apparatus in which the bit is provide with a screw shaped surface extending axially thereof for conveying cuttings away from the end of the bit, said screw shaped surface extending through a convolution of at least 180 deg..

SEE OR SEARCH THIS CLASS, SUBCLASS:

310, for receptacles with helical conveying structure.

323, for a tool shaft provided with an external helix or conveyor.

388, for bits having a screw pilot.

SEE OR SEARCH CLASS

52, Static Structures (e.g., Buildings), 157, for an auger type earth anchor.

299, Mining or In Situ Disintegration of Hard Material,

87.1, for a cutter head for mining or disintegrating hard material having a helical cutting or conveying portion.

408, Cutting by Use of Rotating Axially Moving Tool,

230, for a twist drill of general utility.