Boring or penetrating the earth – Bit or bit element – Magnetized or with magnet
Patent
1988-11-21
1991-01-01
Neuder, William P.
Boring or penetrating the earth
Bit or bit element
Magnetized or with magnet
175397, E21B 1046
Patent
active
049811843
ABSTRACT:
A drag bit for soft formation is disclosed which consists of a new cutting mechanism. The drag bit face forms one or more pairs of radially disposed ridges separated by a valley whereby a leading ridge supports multiple rounded projections and the following ridge supports multiple positive rake angle cutters. The rounded projection elements move aside an elastic earth formation and the separated and trailing cutters clip off the dislodged formation to advance the bit in a borehole.
REFERENCES:
patent: 4554986 (1985-11-01), Jones
patent: 4629639 (1987-07-01), Barr et al.
patent: 4660659 (1987-04-01), Short, Jr. et al.
Doctoral Thesis Entitled: "A Parabolic Yield Condition for Anisotropic Rocks and Soils", Michael Berry Smith, May, 1974.
Publication of Prentice Hall Entitled: "Advanced Strength of Materials", Voltera and Gaines, 1971.
Azar Michael G.
Knowlton R. Helene
Neuder William P.
Smith International Inc.
Upton Robert G.
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