Rotary rock bit and method of making same

Details Rotary rock bit and method of making same Rotary rock bit and method of making same

1977-11-09

1979-03-20

Butler, Douglas C.

Cutlery

76108A, 175375, 219121EM, 308139, F16C 3300

Patent

active

041450949

ABSTRACT:
A rotary rock bit is described having a plurality of legs extending downwardly from the main bit body. Each leg includes an annular bore extending through the lower extremity thereof. A separate journal pin is provided for each leg, with each journal pin having a mounting end and a bearing end. The mounting end of each journal pin is adapted to extend into the bore of a respective leg and be secured thereto by an electron beam welding process. The bearing end of the journal pin is adapted to receive an annular thrust member extending over the bearing surface thereof. The annular thrust member is secured to the journal pin by the same electron beam welding process step which welds the journal pin to the bore of the leg. A cone type cutter is adapted to be rotatably mounted on the bearing end of each journal pin with the annular thrust member functioning to retain the cutter on the journal pin and to absorb the in and out-thrust and radial loads passing therethrough.

REFERENCES:
patent: 1839589 (1932-01-01), Reed
patent: 2334359 (1943-11-01), Stancliff
patent: 4043411 (1977-08-01), Lichte

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