Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1998-06-25
1999-11-09
Bagnell, David
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175341, 175378, E21B 1016
Patent
active
059795751
ABSTRACT:
An earth-boring bit has a rotating cutter of a hybrid design. The bit has a bit body and a bearing shaft which is cantilevered downwardly and inwardly from the bit body. The cutter is mounted for rotation on the bearing shaft and has a plurality of cutting elements arranged in circumferential rows on the cutter. These rows include inner rows and a heel row. The cutting elements in the inner row are formed of a hard metal such as tungsten carbide and are pressed interferingly into apertures in the cutter. The heel row is made up of steel teeth formed on the cutter.
REFERENCES:
patent: 4940099 (1990-07-01), Deane et al.
patent: 5131480 (1992-07-01), Lockstedt et al.
patent: 5224560 (1993-07-01), Fernandez
patent: 5351768 (1994-10-01), Scott et al.
patent: 5353885 (1994-10-01), Hooper et al.
patent: 5445231 (1995-08-01), Scott et al.
patent: 5542485 (1996-08-01), Pessier et al.
patent: 5833020 (1998-11-01), Portwood et al.
Baker Brian A.
Grimes Robert E.
Meiners Matthew J.
Overstreet James L.
Bagnell David
Baker Hughes Incorporated
Bradley James E.
Walker Zakiya
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