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US 7,070,010 B2Granted
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 with cutters (2, 2′) located on its face, with a blind hole (5) for attaching the drill bit (1) to an anchor rod and with at least one channel (10) which emerges from the blind hole (5) and which discharges on the outside surface of the drill bit (1), the mouth (11) of the channel (10) being located in the drill bit (1) outside the face which is equipped with cutters (2, 2′), the surface section (12) of the side surface (13) of the drill bit (1) in which the mouth (11) of the channel (10) is located, is arranged set back relative to the periphery of the face of the drill bit (1) in the direction to its axis (4) and is concavely curved, and the mouth (11) of the channel (10′) being located off-center in the concavely curved surface section (12) to the latter, wherein the mouth (11) of the channel (10′) is located in a concavely curved surface section (12) offset to its edge which is forward in the direction of rotation of the drill bit (1).
Dependencies are inferred from the claim text.