(under subclass 91) Subject matter for specified bearing structure for a rotary bit in which a cutter element, or carrier for a fixed cutter is rotatably mounted thereon so that the cutter element, or carrier may roll, or tend to roll on a surface of a borehole as the bit is rotated.
(1) Note. Patents have been classified in this and indented subclasses which claim a portion of a bit which supports the specified bearing, or a specified bearing disclosed for a roller drill bit.
(2) Note. A drill bit with details of the bit is in Class 175.
SEE OR SEARCH CLASS
175, Boring or Penetrating the Earth,
227+, for storage means for bit lubricant carried by bit, or shaft and subclasses 371+ for a bit earth cutter having details of the bit and see search note for Class line.
