EP 0219959 A2 19870429 - Rock bit with wear resistant inserts.
Title (en)
Rock bit with wear resistant inserts.
Title (de)
Gesteinsbohrer mit verschleissbeständigen Einsätzen.
Title (fr)
Tête de forage pourvue d'éléments résistant à l'usure.
Publication
Application
Priority
US 78912085 A 19851018
Abstract (en)
A rock bit has three cones with tunsgten carbide inserts in the cutting structure of each cone. The gage row inserts have a layer of polycrystalline diamond on the converging portion protruding from the surface of the cone. One or more transition layers are provided between the tungsten carbide insert body and the polycrystalline diamond layer. Such a transition layer comprises diamond and precemented tungsten carbide.
IPC 1-7
IPC 8 full level
E21B 10/08 (2006.01); B22F 7/06 (2006.01); C22C 26/00 (2006.01); E21B 10/52 (2006.01); E21B 10/56 (2006.01); E21B 10/567 (2006.01)
CPC (source: EP US)
B22F 7/06 (2013.01 - EP); C22C 26/00 (2013.01 - EP); E21B 10/52 (2013.01 - EP); E21B 10/5673 (2013.01 - EP US); E21B 10/5735 (2013.01 - EP US); B22F 2998/00 (2013.01 - EP)
Designated contracting state (EPC)
BE CH DE FR GB IT LI SE
DOCDB simple family (publication)
EP 0219959 A2 19870429; EP 0219959 A3 19881019; EP 0219959 B1 19920429; CA 1256096 A 19890620; DE 3685083 D1 19920604; IE 57504 B1 19930210; IE 862386 L 19870418; JP S62111093 A 19870522
DOCDB simple family (application)
EP 86306897 A 19860905; CA 517811 A 19860909; DE 3685083 T 19860905; IE 238686 A 19860908; JP 24565986 A 19861017