Rotary drill bit having improved mounting means for multiple cut

Details Rotary drill bit having improved mounting means for multiple cut Rotary drill bit having improved mounting means for multiple cut

1987-08-13

1990-03-13

Bilinsky, Z. R.

Boring or penetrating the earth

Bit or bit element

Magnetized or with magnet

175410, 408144, 408145, E21B 1046

Patent

active

049076620

ABSTRACT:
A drag type drill bit (10) having a plurality of solid block-like holders (30, 32, 34) secured to and projecting from the bit body (12), each holder (30) having a plurality of cutting elements (36) thereon defining spaced cutting edges 54. Each cutting element (36) has a planar cutting face (46) and a cutting edge (54) extending along the cutting face (46) with the cutting face (46) extending in a generally radial direction with respect to the axis of rotation of the bit (10). The holders (30, 32, 34) are arranged in a plurality of rows extending outwardly from adjacent the axis of rotation of the drill bit (10) and the holders (30, 32, 34) in each row are staggered rearwardly with respect to the direction of rotation.

REFERENCES:
patent: 4156329 (1979-05-01), Daniels et al.
patent: 4225322 (1980-09-01), Knemeyer
patent: 4303136 (1981-12-01), Ball
patent: 4429755 (1984-02-01), Williamson
patent: 4440246 (1984-04-01), Jurgens
patent: 4442909 (1984-04-01), Radtke
patent: 4452324 (1984-06-01), Jurgens
patent: 4499958 (1985-02-01), Radtke et al.
patent: 4505342 (1985-03-01), Barr et al.
patent: 4533004 (1985-08-01), Ecer
patent: 4682663 (1987-07-01), Daly et al.
"Compax.RTM. Diamond Drilling Update", Specialty Materials Division-General Electric Company, Jun. 1975.
"Field Test of an 81/2 Inch Polycrystalline Diamond Blade Bit in Colombia", for GoTech, by D. S. Rowley, Drilling Research Laboratory, Dec. 1985.

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