EP0126409B1
Expired / Lapsed
EP
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Boring tool
Assignee: Robert Bosch Power Tools GmbH
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Filing: 1984-05-15
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Granted: 1987-09-23
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Expires: 2004-05-15
Abstract
Abstract A drilling bit having two helical withdrawal grooves which extend from the drilling head in the direction toward the insertion or chucking end. The withdrawal grooves have least slope in the vicinity of the drilling head. In the other regions, the withdrawal grooves have a different slope. As a result, no cross-sectional jumps disposed at uniform intervals are provided on the drilling bit, so that transverse oscillations cannot be reinforced by partially constantly or continuously reflected pulses. A considerable reduction in noise is achieved. Furthermore, the central portion of the drilling bit, which is critical during drilling, receives great rigidity.
Inventors
- 👤 Wolfgang Dipl.-Ing. Peetz
- 👤 Siegfried Klaissle
- 👤 Bernhard Moser
- 👤 August Haussmann
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 10:54
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/22; E21B10/00; E21B10/44; E21B10/445; B; B23; B23B; B23B2251/00; B23B2251/04; B23B2251/043; B23B2251/046
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
94 words
Boring tool for use in driving machines boring in the axial direction for boring in stone, concrete and the like, with a boring head (1), with an adjoining shank part (3), with an insertion or chucking part (6) for connection to a driving device and with at least one helical discharge groove, which extends from the boring head, characterised in that in the region of the boring head (1), the discharge groove (4, 5) has its smallest pitch (pitch angle ß, β1), which increases in the direction of the insertion or chucking part (6).
Claim 2
Dependent Claim
94 words
Boring tool for use in driving machines boring in the axial direction for boring in stone, concrete and the like, with a boring head (1), with an adjoining shank part (3), with an insertion or chucking part (6) for connection to a driving device and with at least one helical discharge groove, which extends from the boring head, characterised in that in the region of the boring head (1), the discharge groove (4, 5) has its smallest pitch (pitch angle ß, β1), which increases in the direction of the insertion or chucking part (6).
Claim 3
Dependent Claim
23 words
Boring tool according to Claim 1, characterised in that the pitch of the discharge groove (4, 5) increases from the boring head (1).
Claim 4
Dependent Claim
25 words
Boring tool according to Claim 1 or 2, characterised in that the pitch of the discharge groove (4, 5) increases towards the chucking end (6).
Claim 5
Dependent Claim
23 words
Boring tool according to one of Claims 1 to 3, characterised in that the pitch of the discharge groove (4', 5') increases continuously.
Claim 6
Dependent Claim
41 words
Boring tool according to one of Claims 1 to 3, characterised in that the pitch of the discharge grooves (4', 5'; 4a; 5a; 4b, 5b;) increases in sections from the drilling head (1) in the direction of the chucking end (6).
Claim 7
Dependent Claim
37 words
Boring tool according to Claim 1 or 2, characterised in that the pitch of the discharge groove (4", 5") first of all increases from the boring head (1") and then remains constant towards the chucking end (6).
Claim 8
Dependent Claim
28 words
Boring tool according to one of Claims 1 to 6, characterised in that the axial width (13) of the discharge groove (4, 5) increases as the pitch increases.
Claim 9
Dependent Claim
27 words
Boring tool according to one of Claims 1 to 7, characterised in that the discharge groove (4, 5) has a different cross sectional shape over its length.
Claim 10
Dependent Claim
30 words
Boring tool according to Claim 8, characterised in that in the region of the boring head (1), the discharge groove (4, 5) has an at least approximately rectangular cross section.
Claim 11
Dependent Claim
42 words
Boring tool according to one of Claims 1 to 9, characterised in that the radial depth (20, 20', 20") of the discharge groove (4, 5) decreases from the boring head (1) in the direction of the chucking end (6), preferably decreases continuously.
References Cited (Backward Citations)
No citation records indexed.
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