Hard material insert for a drill and a drill with the hard...

Details Hard material insert for a drill and a drill with the hard... Hard material insert for a drill and a drill with the hard...

2007-08-20

2010-06-15

Bagnell, David J (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Specific or diverse material

C175S425000

Reexamination Certificate

active

07735585

ABSTRACT:
A hard material insert (1) for a drill (2, 2′) includes an axially central reinforcement (3) provided in the insert, and two diametrically opposite, radial arms (4) each having a cross-section tapering radially outwardly, opposite free side (8) and connection side (7), with the free and connection sides (8, 7) of one of the radial arms (4) being arranged alternatively to the free and connection sides of another of the radial arms (4), and a concave recess (6) provided on the connection side (7).

REFERENCES:
patent: 6817429 (2004-11-01), Sollami
patent: 2006/0243496 (2006-11-01), Widmann

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