Drill bit

Details Drill bit Drill bit

E - Fixed Constructions

21

B

255/77

E21B 10/00 (2006.01) E21B 10/22 (2006.01) F16C 17/18 (2006.01) F16C 33/12 (2006.01)

Patent

CA 1039266

ABSTRACT OF THE DISCLOSURE A roller cutter drill bit comprises a body having a journal, a roller cutter, bearing means for rotatively mounting a roller cutter on the journal and a part of said bearing means including a hard, tough metal bushing with a lubricant metal coated thereon, and positioned between the sleeve and the journal and between the sleeve and the roller cutter to prevent galling.

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