Rotary drill bit with improved cutter

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element

Patent

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Details

175374, 175432, 277 92, 384 96, E21B 1000

Patent

active

054292000

ABSTRACT:
A rotary cone drill bit for forming a borehole having a body with an underside and an upper end portion adapted for connection to a drill string. The drill bit rotates around a central axis of the body. A number of angularly-spaced arms are integrally formed with the body and depend therefrom. Each arm has an inside surface with a spindle connected thereto and an outer shirttail surface. Each spindle projects generally downwardly and inwardly with respect to its associated arm, has a generally cylindrical upper end portion connected to the associated inside surface, and has an inner sealing surface on the upper end portion. A number of rotary cone cutters equal to the number of arms are each mounted on respective spindles. Each of the cutters includes an internal generally cylindrical wall defining a cavity for receiving the respective spindle, a gap with a generally cylindrical portion defined between the spindle and cavity wall, an outer sealing surface in the cavity wall concentric with the inner sealing surface, and a seal element spanning the gap and sealing between the inner and outer sealing surfaces. The rotary cone cutters are preferably composites formed from different types of material and have a ring base separately formed.

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Rock Bits Diamond Products Drilling Tools, Security Oilfield Catalog, 40 pages (Undated).
Security Sales Literature, A Totally New Rock Bit Bearing System, 10 pages (undated).

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