Earth boring bit with labyrinth seal protector

Details Earth boring bit with labyrinth seal protector Earth boring bit with labyrinth seal protector

1985-11-06

1986-09-23

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

277177, 277188R, 384 93, 384 94, E21B 1022

Patent

active

046130047

ABSTRACT:
An earth boring bit with sealed and lubricated bearings and rotatable cutters, the seals being isolated from detritus in the borehole by a seal protector ring and groove. The ring, generally L shaped in cross-section, has radial and axial clearances from the registering groove to maintain a labyrinth path with selected values, irrespective of cone movement during drilling.

REFERENCES:
patent: 2898134 (1959-08-01), Moskow
patent: 3094335 (1963-06-01), Shenk
patent: 4168868 (1979-09-01), Shields
patent: 4194792 (1980-03-01), Rife
patent: 4199156 (1980-04-01), Oldham et al.
patent: 4209890 (1980-07-01), Koskie, Jr.
patent: 4235480 (1980-11-01), Olschewski et al.
patent: 4306727 (1981-12-01), Deane et al.
patent: 4516641 (1985-05-01), Burr

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