Drill bit for boring earth and other hard materials
AssigneeAtlas Copco Secoroc LLC
InventorsMark L. JONES, Kenneth M. CURRY
Life of this patent
Estimating the term…
Abstract
A drill bit for drilling a hole through earth and hard materials, the drill bit including a bit body having an inner bore and a cutting head at a cutting end, the cutting head including a center portion with one or more apertures extending from the cutting end to the inner bore, a perimeter portion projecting radially outward to form a plurality of blades divided by a plurality of junk slots, a cutting face, and a plurality of cutter receptacles spaced about the cutting face. A plurality of cutters with cutter tips terminating in points are in mounted into the cutter receptacles at a pitch angle relative to the cutting face, and with the plurality of cutter points together defining a projected cutting surface.
Claims20
A drill bit for drilling a hole through earth and hard materials, said drill bit comprising:
- a bit body having a first end, a second end spaced apart from said first end, a middle section between said first end and said second end, said bit body having a longitudinal axis, said bit body including a bore extending from said first end towards said second end;
- a connection means configured to couple said bit body to a rotation means for providing rotational torque to said bit body, said connection means being located at said first end;
- a cutting head at said second end, said cutting head including:
- a center portion having at least one aperture extending from said second end to said bore;
- a perimeter portion projecting radially outwardly beyond said middle section, said perimeter portion having an outer radial surface, said perimeter portion having a plurality of junk slots extending inwardly from said outer radial surface to divide said perimeter portion into a plurality of blades;
- a cutting face;
- and
- a plurality of cutter receptacles, said cutter receptacles being spaced about said cutting face;
- and
- a plurality of cutters, each of said cutters having a cutter tip centered about a cutter axis and terminating in a cutter point, each of said cutters being mounted into a cutter receptacle at an individual pitch angle relative to said cutting face and with said cutter tip being pointed in a direction of intended rotation of said drill bit, said pitch angle being measured relative to a reference line perpendicular to said longitudinal axis of said bit body and intersecting said cutter axis, said individual pitch angles each being an acute angle opening away from said reference line, and
- said plurality of cutter points together defining a projected cutting surface.
Dependencies are inferred from the claim text.