A milled tooth rotary cone rock bit comprises chisel crested milled teeth with generously radiused corners at the ends of the crest of each chisel shaped tooth. A concave depression is formed in the crest between the radiused ends. A layer of hardfacing material formed over each tooth is thicker at the corners and in the concave depressions in the crest to provide a means for inhibiting wear of the hardfacing as the bit works in a borehole. <IMAGE>
申请公布号
EP0510531(A1)
申请公布日期
1992.10.28
申请号
EP19920106615
申请日期
1992.04.16
申请人
SMITH INTERNATIONAL, INC.
发明人
KESHAVAN, MADAPUSI K.;MCDONOUGH, SCOTT D.;SLAUGHTER, ROBERT H., JR.