Rotary drill bit having a solid forged, unitary body

Details Rotary drill bit having a solid forged, unitary body Rotary drill bit having a solid forged, unitary body

1978-05-19

1981-03-17

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

76108R, E21B 1050

Patent

active

042561949

ABSTRACT:
A rotary drill bit for use on a rotating drill string includes a solid forged unitary main body having a plurality of downwardly facing hemi-cylindrical body surfaces. A plurality of cutter bases are provided, each cutter base including an upwardly facing hemi-cylindrical base surface that is fused to one of the body surfaces by electron beam welding. Each cutter base includes a bearing pin extending inwardly with respect to the bit. A cone shaped cutter is rotatably mounted on the bearing pin for rotating about the bearing pin during drilling operations to bore through earth formations.

REFERENCES:
patent: 2124521 (1938-07-01), Williams et al.
patent: 2644671 (1953-07-01), Ingram
patent: 3420324 (1969-01-01), Vesper
patent: 3850256 (1974-11-01), McQueen
patent: 4043411 (1977-08-01), Lichte
patent: 4098150 (1978-07-01), Penny et al.
patent: 4127043 (1978-11-01), Evans

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