Boring or penetrating the earth – Bit or bit element – With helical-conveying portion
Patent
1998-01-23
2000-07-18
Neuder, William
Boring or penetrating the earth
Bit or bit element
With helical-conveying portion
175323, 1754201, 408230, E21B 1044
Patent
active
060893370
ABSTRACT:
A drilling and/or chiseling tool is formed basically by a shaping without cutting procedure and has a axially extending shaft (1) with at least three helical drilled material removal grooves (2). The shaft (1) has a shank (3) at its trailing end in the drilling direction, and at the opposite end, leading in the drilling direction is a drilling head (6). The drilling head (6) has a recess for holding a hard metal insert (8). Because of the number of removal grooves (2), the course of the grooves is approximately parallel to the shaft axis, whereby in the drilling head (6) region there is adequate material for laterally supporting the hard metal insert (8). Accordingly, an expensive correction of the shape of the removal grooves (2) in the region of the drilling head (6) can be avoided.
REFERENCES:
patent: 4579180 (1986-04-01), Peetz et al.
patent: 4967855 (1990-11-01), Moser
patent: 5553682 (1996-09-01), Batliner et al.
patent: 5641028 (1997-06-01), Resendez et al.
Patent Abstract of Japan No. 59 007511.
Bongers-Ambrosius Hans-Werner
Kleine Werner
Hilti Aktiengesellschaft
Neuder William
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