Boring or penetrating the earth – Bit or bit element – Magnetized or with magnet
Patent
1990-01-26
1991-10-29
Bagnell, David J.
Boring or penetrating the earth
Bit or bit element
Magnetized or with magnet
175411, 228125, 228168, 407118, B23K 3102, E21B 1046
Patent
active
050607391
ABSTRACT:
A cutter assembly, for a rotary drill bit, comprises a stud to be received in a socket in the surface of the bit body, the stud being formed, adjacent one end, with a plane surface inclined to the longitudinal axis of the stud. A preform cutting element comprises a front surface, a peripheral edge surface, and a flat rear surface which is brazed to the surface on the stud, the peripheral edge surface of the cutting element being wholly exposed. The junction between the peripheral edge surface and the rear surface of the cutting element is chamfered. Any external fillet of brazing alloy is preferably removed or is not allowed to form during brazing, and the space between the chamfer and the surface of the stud may also be free of brazing alloy. Removal of the brazing fillet may also be advantageous in the case of a non-chamfered cutter.
REFERENCES:
patent: 2753622 (1956-07-01), Bieber et al.
patent: 4520881 (1985-06-01), Phaal
patent: 4716975 (1988-01-01), Dennis
patent: 4727945 (1988-03-01), Dennis
patent: 4767050 (1988-08-01), Flood et al.
patent: 4893875 (1990-01-01), Lonn et al.
patent: 4972912 (1990-11-01), Keshavan
patent: 4993505 (1991-02-01), Packer et al.
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