Rock drill

Details Rock drill Rock drill

1998-06-11

2000-10-10

Bagnell, David

Boring or penetrating the earth

Bit or bit element

With helical-conveying portion

175415, E21B 1044

Patent

active

061291625

ABSTRACT:
A rock drill has an axially extending drill shaft (2) with at least one helically shaped drilled material removal groove (3) and a drillhead (5) formed of a hard metal alloy. The drillhead (5) is secured to an end face of the drill shaft (2) such as by welding or soldering and has a main cutter (6) extending along a diagonal of the drillhead and at least one supplementary cutter (7, 8) extending along another diagonal of the drillhead. The supplementary cutter (7, 8) projects axially outwardly from a radially outer section of the main cutter (6).

REFERENCES:
patent: 4889200 (1989-12-01), Moser
patent: 5482124 (1996-01-01), Haussmann et al.
patent: 5492187 (1996-02-01), Neukirchen et al.
patent: 5779403 (1998-07-01), Kleine et al.

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