Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1996-05-01
1998-04-21
Bagnell, David J.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
761084, E21B 1022
Patent
active
057408718
ABSTRACT:
A rotary cone drill bit for forming a borehole having a bit body with an upper end portion adapted for connection to a drill string. A number of angularly-spaced support arms formed to extend from the bit body. Each support arm has an inside surface with a spindle connected thereto and an outer surface. A number of cutter cones equal to a number of support arms are rotatably mounted on respective spindles. Each of the cutter cones includes an integral cylindrical cavity for receiving the respective spindle. A gap with a generally cylindrical portion is formed between the spindle and the cavity with a seal element disposed within the gap. The gap has an opening contiguous with the bottom edge of the outer surface and extending outwardly from the spindle. A bearing element is disposed within each gap between the exterior of the respective spindle and the interior of the respective cavity. A seal element is disposed within each gap to seal between the respective spindle and the interior of the respective cavity. A diverter ring is disposed on the exterior of each spindle approximate to the respective inside surface and located within the opening to the respective gap. The diverter ring comprises a disk having a plurality of ribs extending therefrom to divert abrasive fluids away from the gap.
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Bagnell David J.
Dresser Industries Inc.
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