Rock bit with rigid face seals and recessed energizers

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

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Details

277 83, 277 84, E21B 1020

Patent

active

049230204

ABSTRACT:
An improved mechanical face seal for rock bits using rigid rings and energizers placed in recesses or grooves in the cutter and bearing shaft. The minimum diameter of the shaft groove is substantially equal to the relaxed inside diameter of the shaft energizer and the maximum diameter of the cutter recess is substantially equal to the relaxed outside diameter of the cutter energizer. The radii at the inner end of the shaft groove and the outer end of the cone groove conform to the relaxed cross-section of their respective energizers. The mean diameter of the shaft energizer is substantially equal to the cone journal diameter and the product of the mean diameter and cross-sectional diameter is the same for both energizers.

REFERENCES:
patent: 1884965 (1932-10-01), Baggett et al.
patent: 3180648 (1965-04-01), Kupfert
patent: 3656764 (1972-04-01), Robinson
patent: 3761145 (1973-09-01), Schumacher
patent: 4516640 (1985-05-01), Karlsson
patent: 4516641 (1985-05-01), Burr
patent: 4548280 (1985-10-01), Daley et al.
patent: 4577705 (1986-03-01), Cross
patent: 4623028 (1986-11-01), Murdoch et al.
patent: 4666001 (1987-05-01), Burr
patent: 4688647 (1987-08-01), Daley et al.
patent: 4753303 (1988-06-01), Burr

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