Means for mounting a roller cutter on a drill bit

Details Means for mounting a roller cutter on a drill bit Means for mounting a roller cutter on a drill bit

1990-03-13

1991-02-12

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

384 96, E21B 1020

Patent

active

049916718

ABSTRACT:
A rotary drill bit (10) having a roller cutter (28) retained on a journal (24) by an externally threaded retainer ring (52) mounted within an annular groove (48) in the journal (24). The radii (R1, R2) formed at the inner and outer corners of the groove (48) are designed by suitable formulas to provide adequate strength for the journal (24) including the flange (50) adjacent the groove (48).

REFERENCES:
patent: 959540 (1910-05-01), Hughes
patent: 1010144 (1911-11-01), Hughes
patent: 1890887 (1932-12-01), Reed
patent: 2490151 (1949-12-01), Noble et al.
patent: 2513634 (1950-07-01), Francis
patent: 3971600 (1976-07-01), Murdoch et al.
patent: 4236764 (1980-12-01), Galle
patent: 4538928 (1985-09-01), Muma
patent: 4911255 (1990-03-01), Pearce
Reed Tool Company Drawing No. D-139918 dated 1-11-88 for "Lug, Jet F".
Reed Tool Company Drawing No. D-140424 dated 11-17-88 for "Lug, Jet F".

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