Carbide tipped drill bit for boring holes in concrete and steel
OwnerNorman H. Schmotzerinventor
Life of this patent
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Abstract
A drill bit having a carbide tip brazed in the drill bit shank is disclosed for use in forming cylindrical holes in both concrete and steel by rotation about a central axis. The carbide tip has two side surfaces on opposite sides of said central axis. The top surfaces are connected by a substantially V-shaped notch which extends between the side surfaces and has its vertex off-center of the central axis to more effectively cut both concrete and steel.
Claims11
A drill for forming cylindrical holes in both concrete and steel, said drill having a bit containing a carbide tip with first and second flat surfaces on opposite sides of the central axis of said drill and having a front and back face extending parallel to said central axis, said front and back faces intersecting with said first and second flat surfaces respectively to form cutting edges wherein the improvement comprises a notch extending between said first and second flat surfaces and said front and back faces, said notch defining sidewalls and having cutting edges formed by the intersection of said sidewalls and said front and back faces to effectively cut said concrete and steel.
Dependencies are inferred from the claim text.