Cutting plate for a drill bit

Details Cutting plate for a drill bit Cutting plate for a drill bit

2007-06-05

2007-06-05

Bagnell, David (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

C175S420000, C175S420100, C175S395000, C175S426000

Reexamination Certificate

active

10914881

ABSTRACT:
An auxiliary cutting plate (10) for a multi-cutting plate drill bit (2) has a body (44) for fixing into a slot in the drill bit (2) and a profiled tip (46). The body (44) has a central longitudinal axis and the profiled tip (46) protrudes from one end of the body (44). The profiled tip (46) has a cutting edge (62) defined by a transition between a rake face (64) and a relief face (66). The rake face (64) and the relief face (66) each slope axially rearward from opposite sides of the cutting edge (62). The angle of inclination θ of at least a portion of the rake face (64), measured from a plane perpendicular to the longitudinal axis, decreases with increasing distance from the cutting edge (62).

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