Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1979-10-05
1981-04-21
Purser, Ernest R.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175410, 76108R, E21B 1052
Patent
active
042627613
ABSTRACT:
One or more holes are drilled into the crest of the tooth-shaped cutting structure of a milled steel tooth rotary rock bit. Tungsten carbide rods are positioned in the holes and hardfacing is applied to the tooth. The hardfacing is applied across the top of the tooth crest and acts to hold the tungsten carbide rods in place. The rods are inserted in holes parallel and close to one flank of the tooth so that the entire length of the carbide rods can be attached to the hardfacing by burning the hardfacing through to the carbide rods. Wear on the tooth will proceed along the side of the tooth not reinforced with the carbide rods and a self-sharpening effect is enhanced by the strength of the carbide rods. The carbide rods and holes therefore can be relatively inexpensive, since close tolerance finishing is not required.
REFERENCES:
patent: 1885085 (1932-10-01), Dalzen
patent: 2089481 (1937-08-01), Howard
patent: 2244617 (1941-06-01), Hannum
patent: 2483221 (1949-09-01), Morrow
patent: 2644673 (1953-07-01), Baker
patent: 2732198 (1956-01-01), Joy
patent: 3126067 (1964-03-01), Schumacher, Jr.
patent: 3140748 (1964-07-01), Engle et al.
patent: 3461983 (1969-08-01), Hudson et al.
Dresser Industries Inc.
Favreau Richard E.
Purser Ernest R.
Scott Eddie E.
Winans Fred A.
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