Drill bit, hard member, and bit body
AssigneeKennametal Inc.
InventorsCurnie A. Dunn, Phillip W. Haga, Ted R. Massa, Douglas E. Bise, Gary J. Condon, Stephen T. Belsheim, James E. Rutherford
Life of this patent
Estimating the term…
Abstract
A rotary drill bit for penetrating earth strata wherein the drill bit includes a drill bit body that has an axial forward end. The drill bit body has a hard insert, which is preferably monolithic, that is affixed to the drill bit body at the axial forward end thereof. The hard insert presents at least three discrete leading cutting edges for cutting the earth strata.
Claims38
A rotary drill bit for penetrating earth strata, the drill bit comprising:
- an elongate bit body having an axial forward end;
- and a monolithic hard insert being affixed to the bit body at the axial forward end thereof, and the hard insert presenting at least three discrete leading cutting edges for cutting the earth strata.
A rotary drill bit for penetrating earth strata, the drill bit comprising:
- an elongate bit body having an axial forward end;
- and a monolithic hard insert being affixed to the bit body at the axial forward end thereof, and the hard insert presenting at least three discrete leading cutting edges for cutting the earth strata, the bit body having a peripheral surface and containing a central bore, and the bit body further containing at least three ports in the peripheral surface communicating with the central bore, and each one of the ports has an axial forward edge, and the axial forward edge of each port is spaced a different distance away from the axial forward end of the bit body.
A rotary drill bit for penetrating the earth strata, the drill bit comprising:
- an elongate drill bit body having an axial forward end, the elongate drill bit body having a longitudinal axis, the axial forward end being defined at least in part by a discrete first axial forward surface that is generally perpendicular to the longitudinal axis and a discrete second axial forward surface that is generally perpendicular to the longitudinal axis, and the first axial forward surface being axially spaced apart from the second axial forward surface;
- a hard insert being affixed to the axial forward end of the drill bit body so as to form a joint between the hard insert and the bit body wherein the joint being defined at least in part by the second axial forward surface.
A rotary drill bit for penetrating the earth strata, the drill bit comprising:
- an elongate drill bit body having an axial forward end, the axial forward end being defined at least in part by a discrete first axial forward surface and a discrete second axial forward surface, and the first axial forward surface being axially spaced apart from the second axial forward surface;
- a hard insert being affixed to the axial forward end of the drill bit body so as to form a joint between the hard insert and the bit body wherein the joint being defined at least in part by the second axial forward surface wherein the hard insert being a single monolithic member, and the hard insert presenting at least three discrete leading cutting edges for cutting the earth strata.
A hard member for attachment to a drill bit body so as to form a rotary drill bit for penetrating the earth strata and the rotary drill bit having a central longitudinal axis, the hard member comprising:
- a forward surface and a rearward surface, and at least three discrete leading cutting edges for cutting the earth strata projecting from the forward surface of the hard member, and the hard member is a single monolithic piece.
A hard member for attachment to a drill bit body so as to form a rotary drill bit for penetrating the earth strata and the rotary drill bit having a central longitudinal axis, the hard member comprising:
- a forward surface and a rearward surface, and at least three discrete leading cutting edges for cutting the earth strata projecting from the forward surface of the hard member wherein the hard member having a center point through which the central longitudinal axis of the rotary drill bit passes, the bit body having a peripheral surface, and each one of the leading cutting edges beginning at a point spaced away from the center point of the hard member and extending in a direction away from the center point and the hard member is a single monolithic piece.
A hard member for attachment to a drill bit body so as to form a rotary drill bit for penetrating the earth strata and the rotary drill bit having a central longitudinal axis, the hard member comprising:
- a forward surface and a rearward surface, and at least three discrete leading cutting edges for cutting the earth strata projecting form the forward surface of the hard member, and the hard member comprising a hard body and at least three discrete cutting elements affixed to the hard body, each one of the cutting elements defining one of the leading cutting edges for cutting the earth strata, and the cutting elements having a hardness substantially equal to the hardness of the hard body.
An elongate rotary drill bit body for attachment to a hard member so as to form a rotary drill bit for penetrating earth strata that generates debris, the drill bit body comprising a peripheral surface, at least one scalloped portion in the peripheral surface, and a debris breaker being contained in the scalloped portion wherein the debris impinges upon the debris breaker during the penetration operation.
An elongate rotary drill bit body for attachment to a hard member so as to form a rotary drill bit for penetrating the earth strata that generates debris, the drill bit body comprising a peripheral surface, at least one scalloped portion in the peripheral surface, and a debris breaker being contained in the scalloped portion wherein the debris impinges upon the debris breaker during the penetrating operation, and further including a pedestal portion adjacent to the axial forward end, and the pedestal portion including at least three scalloped portions wherein each adjacent pair of scalloped portions defining one of a trio of pedestal lobes, and wherein each one of the pedestal lobes presenting a peripheral surface that widens as the pedestal lobe moves in an axial rearward direction.
A rotary drill bit for engaging an earth strata comprising:
- a drill bit body having an axial forward end;
- a hard body being affixed to the drill bit body at the axial forward end thereof;
- the drill bit body having a first hardness, the hard body having a second hardness, the hard body carrying at least three discrete cutting elements wherein each one of the cutting elements presenting a leading cutting edge for cutting the earth strata;
- and the cutting elements having a third hardness greater than each one of the second hardness of the hard body and the first hardness of the bit body, and the second hardness of the hard body is greater than the first hardness of the bit body.
A roof drill bit body for attachment to a hard component so as to form a rotary drill bit for penetrating earth strata that generates debris, the drill bit body comprising:
- a central bore, and a peripheral surface;
- and the peripheral surface containing at least three apertures being in communication with the central bore including at least three scallops wherein each one of the apertures is contained in its corresponding one of the scallops, further including an axial forward end, and each one of the scallops beginning at the axial forward end of the drill bit body and becoming shallower and narrower as it moves in an axial rearward direction, and each scallop has an axial rearward boundary, and the axial rearward boundary for each scallop is at a different distance away from the axially forward end of the roof drill bit body.
A roof drill bit body for attachment to a hard component so as to form a rotary drill bit for penetrating earth strata that generates debris, the drill bit body comprising:
- a central bore, and a peripheral surface;
- and the peripheral surface containing at least three apertures being in communication with the central bore, and further including an axial forward end, each one of the apertures has a forward edge, and the apertures have an orientation so that the forward edge of each one of the apertures is spaced a different distance away from the axial forward end of the roof drill bit body.
A roof drill bit body for attachment to a hard component so as to form a rotary drill bit for penetrating earth strata that generates debris, the drill bit body comprising:
- a central bore, and a peripheral surface;
- and the peripheral surface containing at least three apertures being in communication with the central bore, and further including an axial forward end, each one of the apertures has a center, and the center of each one of the apertures is spaced a different distance away from the axial forward end of the roof drill bit body.
A roof drill bit body for attachment to a hard component so as to form a rotary drill bit for penetrating earth strata that generates debris, the drill bit body comprising:
- a central bore, and a peripheral surface;
- and the peripheral surface containing at least three apertures being in communication with the central bore, and further including an axial forward end, each one of the apertures has a rearward edge, and the rearward edge of each one of the apertures is spaced a different distance away from the axial forward end of the drill bit body.
Dependencies are inferred from the claim text.