(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,
