Drill bit and reamer
AssigneeRobert Bosch GmbH
InventorsHagen W. Dost, Patrick M. McAuliffe, Javier Ibarra, Alexander D. Socha
Life of this patent
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Abstract
A tool bit providing a combined drill bit and reamer is disclosed herein. The tool bit comprises an axial bit shaft including a bore end and a shank end. At least one helical land portion is provided on the bit shaft. The at least one helical land portion includes a cutting edge and a trailing edge. At least one reamer blade is provided on the helical land portion at the bore end of the bit shaft. The at least one reamer blade includes a substantially axial cutting edge. A tip arrangement is also included on the bore end of the bit shaft. The tip arrangement includes a center blade positioned between peripheral cutting blades.
Claims16
A tool bit comprising:
- a) an axial bit shaft including a bore end and a shank end;
- b) at least one helical flute provided on the bit shaft adjacent to at least one helical land portion;
- c at least one reamer blade provided on the bore end of the bit shaft, the at least one reamer blade including a cutting edge, wherein the reamer blade includes a step up portion provided between a smaller bit diameter portion and a larger bit diameter portion;
- and
- d a tip arrangement included on the bore end of the bit shaft, the tip arrangement including a center tip,
- wherein the tip arrangement includes a center blade positioned between at least two peripheral cutting blades, wherein the center tip is positioned on the center blade, and
- wherein the at least two peripheral cutting blades are provided as spurs extending from the bore end of the axial shaft.
A tool bit comprising:
- a) a bit shaft;
- b) at least one helical land portion provided on the bit shaft;
- c) at least one reamer blade provided on the bit shaft;
- and
- d) a brad point arrangement included on an end of the bit shaft,
- wherein the at least one reamer blade includes a substantially axial cutting edge.
A tool bit comprising:
- a) a bit shaft defining an axial direction, the bit shaft including a bore end and a shank end;
- b) at least one helical flute provided on the bit shaft adjacent to at least one helical land portion;
- c) a first substantially axial reamer blade provided on the bore end of the bit shaft;
- d) a tip arrangement provided on the bore end of the bit shaft, the tip arrangement comprising a center blade positioned between at least two peripheral blades, the end point of the center blade defining the furthermost point on the bore end of the bit shaft from the shank end of the bit shaft;
- and
- e) a second substantially axial reamer blade positioned on the bore end of the bit shaft between the first reamer blade and one of the peripheral blades of the tip arrangement.
Dependencies are inferred from the claim text.