Cone mouth debris exclusion shield

Details Cone mouth debris exclusion shield Cone mouth debris exclusion shield

1986-09-23

1987-08-25

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175337, E21B 1022

Patent

active

046886516

ABSTRACT:
A rotary drill bit having a body with a projecting journal and a conical cutter having an axially recessed open end for receiving the journal wherein only the upper portion of the open cone mouth in the cavity formed between the cone and the body is shielded from drilled debris intrusion and the circulating air is channeled in the bearing to the bottom portion of the open cone mouth for improved flow pattern through the various bearing segments whereby the incidence of plugging of the bit due to excess formation being forced into the bearing at the gaping open portion of the upper cone mouth is reduced.

REFERENCES:
patent: 1641261 (1927-09-01), Fletcher
patent: 2260487 (1941-10-01), Scott
patent: 3921735 (1975-11-01), Dysart
patent: 4421184 (1983-12-01), Mullins

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