A hybrid rock bit is disclosed wherein a pair of opposing extended nozzle drag bit legs are positioned adjacent a pair of opposed tungsten carbide roller cones. The extended nozzle face nearest the hole bottom has a multiplicity of diamond inserts mounted therein. The diamond inserts are strategically positioned to remove the ridges between the kerf rows in the hole bottom formed by the inserts in the roller cones.
申请公布号
US4343371(A)
申请公布日期
1982.08.10
申请号
US19800144515
申请日期
1980.04.28
申请人
SMITH INTERNATIONAL, INC.
发明人
BAKER, III, WILLIAM;GARNER, LLOYD L.;HARRIS, CHARLES R.