Rotary drill bit with rotary cutters

Details Rotary drill bit with rotary cutters Rotary drill bit with rotary cutters

1979-05-29

1981-03-31

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

175372, E21B 1020, E21B 1022

Patent

active

042588065

ABSTRACT:
A rotary drill bit having a drill bit body and at least one trunnion projecting from the drill bit body and a rotary cutter supported on at least one pair of radial rolling bearings on the trunnion. The rolling elements of at least one bearing are guided on at last one axial end facing the drill bit body in an outer bearing race groove incorporated in the bore of the rotary cutter. The inner bearing groove is formed on the trunnion for the rolling elements of the radial roller bearing. A filling opening is provided for assembly of the rolling elements comprising a channel which extends through the drill bit body and trunnion and is essentially axially oriented having one terminal end adjacent the inner bearing race groove and at least one filler piece for sealing the opening. The filling opening is arranged to provide a common filling means for each radial bearing.

REFERENCES:
patent: 1905079 (1933-04-01), Wellensiek et al.
patent: 2194675 (1940-03-01), Sanders et al.
patent: 2235548 (1941-03-01), Bozeman
patent: 2293603 (1942-08-01), Francis
patent: 2676790 (1954-04-01), Turner

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