Drill bits having flushing
AssigneeLongyear TM, Inc.
InventorsCody A. Pearce, Michael D. Rupp, Christian M. Lambert
Life of this patent
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Abstract
A drill bit for cutting a hole in a formation. The drill bit has a shank and a crown. The crown has a plurality of crown portions that are spaced about an operative circumference of the drill bit. The shank and crown cooperate to define an interior space that receives water or other drilling fluid. Each crown portion has two longitudinal edges, an outer surface, at least one inner surface and a cutting face. The crown has a base surface that is spaced from the cutting faces of the crown portions and cooperates with the inner surface of each of the two crown portions to define a slot.
Claims54
A drill bit for cutting a hole in a formation, the drill bit having a longitudinal axis bisecting a center of the drill bit and comprising:
- a shank;
- a crown having an operative circumference and comprising:
- a plurality of crown portions spaced apart relative to the operative circumference of the crown, wherein each crown portion of the plurality of crown portions has:
- a first longitudinal edge;
- a second longitudinal edge;
- an outer surface that extends between the first longitudinal edge and the second longitudinal edge and defines a portion of the operative circumference of the crown;
- at least one inner surface, wherein the at least one inner surface extends from the first longitudinal edge to the second longitudinal edge;
- and
- a cutting face;
- and
- a base surface spaced from the cutting faces of the plurality of crown portions relative to the longitudinal axis of the drill bit,
- wherein the base surface cooperates with the inner surfaces of the plurality of crown portions to define a slot, and
- wherein the crown and the shank cooperate to define an interior space about the longitudinal axis.
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Dependencies are inferred from the claim text.