Boring or penetrating the earth – Bit or bit element – Magnetized or with magnet
Patent
1983-02-22
1985-09-03
Novosad, Stephen J.
Boring or penetrating the earth
Bit or bit element
Magnetized or with magnet
175410, E21B 1046
Patent
active
045386900
ABSTRACT:
The invention comprises a drag-type drill bit and a cutting member therefor. Each of the cutting members comprises a stud having a shank adjacent one end mounted in a respective bore in the bit body and a head adjacent the opposite end projecting outwardly from the bit body. The head has a lip formation adjacent the juncture of the head and shank. The lip extends laterally outwardly with respect to the shank to overly the outer surface of the bit body adjacent the respective bore. The cutting face is concave, presenting a plurality of different back rake angles, which angles increase with distance from the lip formation.
REFERENCES:
patent: 1025735 (1912-05-01), Bosredon
patent: 1835701 (1931-12-01), Edmunds
patent: 1859717 (1932-05-01), Rutrle
patent: 1882268 (1932-10-01), Appleman
patent: 2072470 (1937-03-01), Thompson
patent: 2998088 (1961-08-01), Pennington
patent: 3239275 (1966-03-01), Belugou
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patent: 4334585 (1982-06-01), Upton
patent: 4350215 (1982-09-01), Radtke
J. D. Barr, Optimisation of Radial Distribution of Stratapax Cutter in Rock Drilling Bits, Feb. 1, 1980, see FIG. 5.
1980-1981 Composite Catalog, p. 5169.
David Hall, Megadiamond Announces a Unique Service, Oct. 6, 1981.
Cover of Drilling Magazine, Jan. 1983.
1938 Composite Catalog, p. 961.
1938 Composite Catalog, B. K. Appleman of Beaumont, Texas.
1939 Composite Catalog, p. 366.
Excerpt from J. E. Brantley, History of Oil Well Drilling, Gulf Publishing Co., Houston, Texas.
Bui Thuy M.
NL Industries Inc.
Novosad Stephen J.
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