Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1994-08-08
1995-08-08
Novosad, Stephen J.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175227, 761084, E21B 1008, E21B 1024
Patent
active
054390680
ABSTRACT:
A rotary cone drill bit for forming a borehole having a one-piece bit body with a lower portion having a convex exterior surface and an upper portion adapted for connection to a drill string. The drill bit will generally rotate around a central axis of the bit body. A number of support arms are preferably attached to pockets formed in the bit body and depend therefrom. Each support arm has an inside surface with a spindle connected thereto and an outer surface. Each spindle projects generally downwardly and inwardly with respect to the longitudinal axis of the associated support arm and the central axis of the bit body. A number of cone cutter assemblies equal to the number of support arms are mounted respectively on each of the spindles. The spacing between each of the support arms along with their respective length and width dimensions are selected to enhance fluid flow between the cutter cone assemblies mounted on the respective support arms and the lower portion of the bit body. A lubricant reservoir is preferably provided in each support arm to supply lubricant to one or more bearing assemblies disposed between each cutter cone assembly and its associated spindle. Either matching openings and posts or matching keyways and keys may be used to position and align a portion of each support arm within its associated pocket during fabrication of the resulting drill bit.
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U.S. Patent Application Ser. No. 08/287,457 filed Aug. 8, 1994 and entitled Rock bit with Enhanced Fluid Return Area (Attorney's Docket 60220-0169).
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Security/Dresser "Security Oilfield Catalog" Rock Bits, Diamond Products, Drilling Tools, Security Means Technology.
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Dietz Wesley P.
Huffstutler Alan D.
Dresser Industries Inc.
Novosad Stephen J.
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