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US 2006/0032676 A1Published application
Drill bit
AssigneeAtlas Copco MAI GmbH
InventorHerbert Papousek
Life of this patent
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AssigneeAtlas Copco MAI GmbH
InventorHerbert Papousek
Estimating the term…
A drill bit comprises, on its face, either only curved cutting edges or a combination consisting of at least one straight cutting edge and at least two curved cutting edges. The cutting edges on the face of the drill bit are arranged such that they start from the axis of the drill bit or end directly adjacent thereto. Three channels start from a blind hole serving to attach the drill bit to an anchor rod of an injection boring anchor, and their openings are not located in the area of the face of the drill bit but are situated in the area of the lateral surface of the same, said lateral surface conically expanding toward the cutting edges. The openings of the channels are placed in the area of concave recesses of the lateral surface of the drill bit in such a manner that they are recessed with regard to the periphery of the face of the drill bit.
Drill bit (1) with cutters (2, 2′) which are located on its face for removing and/or crushing the material to be worked, with straight cutters (2′) and with curved cutters (2), the cutters (2, 2′) or at least some of them emerging essentially from the point at which the axis (4) penetrates the drill bit (1) through the face of the latter or ending at a distance from this penetration point, one straight cutter (2′) being located in the area of the face of the drill bit (1) which is diametrically opposite the area of the face of the drill bit (1) in which the curved cutters (2) are located, and the curved cutters (2) being curved such that their concave side points toward the area of the face of the drill bit (1) in which the straight cutter (2′) is located.
Dependencies are inferred from the claim text.