Rotary rock bit with the bearing pin fused to the rock bit arm

Details Rotary rock bit with the bearing pin fused to the rock bit arm Rotary rock bit with the bearing pin fused to the rock bit arm

1976-11-12

1977-08-23

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

76108A, 175375, E21B 908

Patent

active

040434117

ABSTRACT:
A rotary rock bit is constructed from at least one rock bit arm and a separate bearing pin. The rock bit arm includes a curved shirttail surface, a plane cutter receiving surface, and a mounting passage extending through said rock bit arm from said cutter receiving surface to said shirttail surface. The bearing pin includes a bearing section and a mounting section. The mounting section is positioned in the mounting passage of the rock bit arm thereby forming a seam between the mounting section of the bearing pin and the mounting passage in the rock bit arm. The mounting section of the bearing pin is fused to the rock bit arm using a beam of energy. The beam of energy is directed from an energy source located on the plane cutter receiving surface side of the rock bit arm. The plane cutter receiving surface is maintained substantially perpendicular to the beam of energy and the beam source is maintained substantially at a fixed distance from the cutter receiving surface during the fusing operation.

REFERENCES:
patent: 1989261 (1935-01-01), Behnke
patent: 2086397 (1937-07-01), Thaheld
patent: 2165584 (1939-07-01), Smith et al.
patent: 2728559 (1955-12-01), Boice et al.
patent: 3086601 (1963-04-01), Galle et al.
patent: 3239431 (1966-03-01), Knapp
patent: 3907191 (1975-09-01), Lichte

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