Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1987-06-10
1989-05-23
Kisliuk, Bruce M.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175410, E21B 1052, E21B 1016
Patent
active
048321397
ABSTRACT:
An inclined chisel crested insert is disclosed for use on the gage row of a cone for a rotary cone rock bit. The insert has a different cone angle on opposite sides of the crown of the insert. An elongated conically shaped gage cutting surface of the insert provides point or line contact with a borehole wall as opposed to a full surface contact with the wall as is common with state of the art flat sided gage row inserts. This inclined chisel insert also has advantages over the symmetrical chisel type gage insert in that it is designed to provide increased crest length while providing the desired gage surface angle. The conically shaped gage row inserts with offset chisel crest are less prone to frictional heating due to the point or line contact design. As a result the elongated conical gage cutting surface of the chisel crest insert minimizes gage insert wear and subsequent breakage by eliminating high cycle thermal fatigue.
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Cawthorne Chris E.
Minikus James C.
Kisliuk Bruce M.
Smith International Inc.
Upton Robert G.
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