Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Patent
1983-12-02
1986-02-04
Leppink, James A.
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
175374, 175340, 175393, 239600, 249 59, 285422, 419 18, E21B 1060
Patent
active
045679541
ABSTRACT:
Replaceable nozzles may be provided in a tungsten carbide drill bit manufactured by powder metallurgical infiltration techniques wherein at least one nozzle is threaded into a corresponding molded threaded bore in the bit. Despite the practical nonmachinability and brittleness of the tungsten carbide material, secure threaded insertion can be achieved if a squared thread design is used, and if the mold plug for forming the threaded bore is oversized to take into account the average variation in shrinkage in a bit formed by powder metallurgical infiltration techniques.
REFERENCES:
patent: 971516 (1910-10-01), Beaver
patent: 2955847 (1960-10-01), McKenna
patent: 3982778 (1976-09-01), Spencer et al.
patent: 4442909 (1984-04-01), Radtke
Balkenbush Robert J.
Lovato Lorenzo G.
McDermaid Joseph D.
Robin Jerry L.
Voight, III Robert W.
Dang Hoang C.
Leppink James A.
Norton Christensen, Inc.
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