Drill head

Details Drill head Drill head

2007-01-16

2007-01-16

Dang, Hoang (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

C175S213000

Reexamination Certificate

active

10898881

ABSTRACT:
A drill head for use in drilling bores in mines and tunnels has a bit and at least one suction opening (5) for removing drillings and having a crushing profile.

REFERENCES:
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patent: 3215215 (1965-11-01), Kellner
patent: 3951220 (1976-04-01), Phillips et al.
patent: 4694916 (1987-09-01), Ford
patent: 4711609 (1987-12-01), Seefluth
patent: 5492187 (1996-02-01), Neukirchen et al.
patent: 4411441 (1991-10-01), None
patent: G9308443.9 (1993-09-01), None
patent: 1740610 (1992-06-01), None
patent: 9611323 (1996-04-01), None

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