Boring or penetrating the earth – Bit or bit element – Magnetized or with magnet
Patent
1984-11-30
1987-07-14
Novosad, Stephen J.
Boring or penetrating the earth
Bit or bit element
Magnetized or with magnet
175410, E21B 1046
Patent
active
046796398
ABSTRACT:
A cutting element for a rotary drill bit comprises a thin hard facing layer, defining a front cutting face, bonded to a less hard backing layer. The backing layer is of non-uniform thickness, for example is wedge-shaped, and is thicker adjacent the cutting edge of the facing layer than it is over the rest of the area of the facing layer. The rear surface of the backing layer of the cutting element is bonded to a surface on a carrier which is mounted in the bit body. The backing layer of the cutting element may be formed in two portions: a front portion which is bonded to the hard facing layer and a second, wedge-shaped portion which is bonded subsequently to the rear surface of the first portion.
REFERENCES:
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patent: 4624830 (1986-11-01), Barr
Barr John D.
Wardley Michael T.
NL Petroleum Products Limited
Novosad Stephen J.
Smith Matthew
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