Drill bit with hard-faced bearing surfaces

Details Drill bit with hard-faced bearing surfaces Drill bit with hard-faced bearing surfaces

1977-02-24

1978-07-04

Leppink, James A.

Boring or penetrating the earth

Processes

Boring with specific fluid

175337, 175371, E21B 910

Patent

active

040983587

ABSTRACT:
A rotary drill bit is provided with confronting large hard annular bearing surfaces on the journal-bearing body and on the journal-mounted conical cutter of the bit. The hard surfaces are generally normal to the axis of rotation of the cutter to bear axial loads, and provide a large bearing area resulting in relatively low unit pressures on the bearing surface. The hardness of the bearing surfaces should be greater than the hardness of the rock or other material being drilled. The journal and cutter may have confronting but spaced inner hard bearing surfaces which come into sliding, bearing contact with each other as the first-mentioned bearing surfaces are worn down. Cooling means are provided to cool the bearing surfaces, and an internal ball bearing and race assembly permits limited movement of the cutter axially on the journal to allow for wear of the bearing surfaces and to eventually bear axial loads. Also described is a nozzle means for sweeping cuttings to the periphery of the drill hole.

REFERENCES:
patent: RE28625 (1975-11-01), Cunningham
patent: 1816203 (1931-07-01), Behnke
patent: 2249578 (1941-07-01), Phipps
patent: 2325745 (1943-08-01), Crum
patent: 3113630 (1963-12-01), Williams, Jr.
patent: 3125174 (1964-03-01), Medlock et al.
patent: 3127942 (1964-04-01), Neilson
patent: 3216513 (1965-11-01), Robbins et al.
patent: 3866987 (1975-02-01), Garner
patent: 3921735 (1975-11-01), Dysart

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