A separate drilling head (1) which is to be forcelockingly secured in a thin-walled hollow anchor tube (3), includes a hard metal cutter element (2), and a drive-side, substantially axially oriented, axial stop shoulder (4) that passes into a circumferentially closed, outer cone (5).
Description
BRIEF DESCRIPTION OF THE DRAWINGS
The drawings show:
FIG. 1 a longitudinal cross-sectional view of a drilling head according to the present invention along line I-I in FIG. 2; and
FIG. 2 a plan view of the drilling head shown in FIG. 1.
Claims
1. A separate drilling head (1) for being forcelockingly secured in a thin-walled hollow anchor tube (3), the drilling head (1) comprising hard metal cutter means (2); and a drive-side, substantially axially oriented, axial stop shoulder (4) that passes into a circumferentially closed, outer cone (5).
2. A drilling head according to claim 1, wherein a cone angle (α) to a longitudinal axis (A) amounts to from between 1° and 5°.
3. A drilling head according to claim 1, wherein the outer cone (5) is formed as a hollow cone.
4. A drilling head according to claim 1, wherein the outer cone (5) is formed as a smooth cone.
5. A drilling head according to claim 1, wherein the drilling head (1) has a diameter in a range of from 30 mm to 60 mm.
6. A drilling head according to claim 1, wherein the axial stop shoulder (4) has a ring width (B) (in a range of from 3 mm to 6 mm.
7. A drilling head according to claim 1, wherein the hard metal cutter means (2) comprises at least one thin hard metal plate (6), and the drilling head (1) has a slot (7) with a slot width (X) of less than 3 mm and in which the at least one hard metal plate (6) is secured.
8. A drilling head according to claim 1, comprising a flush bore (8) extending from an interior of the outer cone (5) up to a region of the cutter means (2).
Patent Application
20070193785
