Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Reexamination Certificate
2011-01-04
2011-01-04
Neuder, William P (Department: 3672)
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
C175S435000
Reexamination Certificate
active
07861806
ABSTRACT:
A shank configuration for rotary drill bits is disclosed for positioning of the shank in relation to a bit body. A tapered surface or feature of the shank may be configured and sized to matingly engage a complementarily shaped surface or feature of the drill bit body and thereby become centered or positioned in relation thereto. A deformable element may be disposed between the shank and bit body. Also, the shank may comprise a material having a carbon equivalent of less than about 0.35%. A multi-pass weld procedure may be employed to affix the shank and bit body to one another wherein welds may be formed so that one weld originates at a circumferential position that differs from the origination circumferential position of its immediately preceding weld by at least about 90°. Further, a stress state may be developed within the multi-pass weld. A method of manufacture is also disclosed.
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Massey Alan J.
Roberts Danielle V.
Ruff Daniel E.
Smith R. Scot
Sullivan Eric C.
Baker Hughes Incorporated
Neuder William P
TraskBritt
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