Drill bit and method of manufacture

Details Drill bit and method of manufacture Drill bit and method of manufacture

1981-05-13

1983-11-29

Schmidt, Frederick R.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

76108R, 76108A, 76101E, 175356, B21K 502, E21B 908

Patent

active

044176295

ABSTRACT:
A method of making a rolling cutter drill bit involving the steps of forming a body member having an upper portion adapted to be threaded and passaging therein, forming at least one arcuate recess in the lower end of the body member, providing a lug assembly comprising a lug member having a bearing journal carrying a rolling cutter and an arcuate surface adapted to be received in the recess, and securing the lug assembly in the recess with the arcuate surface of the lug member in engagement with the arcuate recess. A drill bit made according to the foregoing method is also disclosed.

REFERENCES:
patent: 4158973 (1979-06-01), Schumacher, Jr. et al.
patent: 4256194 (1981-03-01), Varel
patent: 4333364 (1982-06-01), Varel

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