Drill bit having combined positive and negative or neutral rake

Details Drill bit having combined positive and negative or neutral rake Drill bit having combined positive and negative or neutral rake

1993-12-08

1995-01-03

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Forked rotary nontracking

175430, 175431, E21B 1042, E21B 1054

Patent

active

053777735

ABSTRACT:
A drill bit, and a cutter for a drill bit, are provided, wherein the cutter will encounter the formation with cutting surfaces of differing rake angles to optimize cutting efficiency. In most circumstances, the cooperating cutters will have differing, positive, and negative or neutral rakes. Cutters of differing rakes may be cooperatively paired on a drill bit such that the portion of a formation which is affected by the action of one cutter may be similarly affected by the operation of the other cutter.

REFERENCES:
patent: 4342368 (1982-08-01), Denman
patent: 4554986 (1985-11-01), Jones
patent: 4558753 (1985-12-01), Barr
patent: 4660659 (1987-04-01), Short, Jr. et al.
patent: 4858707 (1989-08-01), Jones
patent: 4932484 (1990-06-01), Warren et al.
patent: 4981184 (1991-01-01), Knowlton et al.
patent: 5028177 (1991-07-01), Meskin et al.
patent: 5119892 (1992-06-01), Clegg et al.
patent: 5172778 (1992-12-01), Tibbitts et al.

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