A flushing system in a drill bit, which has a body that defines the flushing system, can include an inlet to facilitate supply of pressurized fluids into a bore hole. A cutting surface of the drill bit is provided with a main opening that defines a main passageway in communication with the inlet. A peripheral surface of the drill bit is provided with a secondary opening that defines a secondary passageway in communication with the inlet. The secondary passageway is disposed at an angle from a horizontal reference plane. The horizontal reference plane is defined between the inlet and the origin of the main passageway and is perpendicular to a central longitudinal axis of the body of the drill bit. An origin of the secondary passageway is at a distance from the origin of the main passageway.

A flushing system in a drill bit, which has a body that defines the flushing system, can include an inlet to facilitate supply of pressurized fluids into a bore hole. A cutting surface of the drill bit is provided with a main opening that defines a main passageway in communication with the inlet. A peripheral surface of the drill bit is provided with a secondary opening that defines a secondary passageway in communication with the inlet. The secondary passageway is disposed at an angle from a horizontal reference plane. The horizontal reference plane is defined between the inlet and the origin of the main passageway and is perpendicular to a central longitudinal axis of the body of the drill bit. An origin of the secondary passageway is at a distance from the origin of the main passageway.

Various drill bits, drilling systems and related methods are provided. In one embodiment, a drill bit comprises a bit body having a face and a shank, at least one insert having a convex engagement surface coupled with the face and at least one wear insert coupled with the shank. In one particular embodiment, the at least one wear insert may be positioned immediately adjacent a coupling end of the shank. The at least one wear insert may include a superabrasive table which may be bonded with a substrate. The at least one wear insert includes a wear surface defined in the superabrasive table. In one embodiment, the superabrasive table may comprise polycrystalline diamond. Similarly, the inset having a convex engagement surface may include a superabrasive material, such as polycrystalline diamond, bonded with a substrate. Such a drill bit may be used, for example, in a top hammer percussion drilling operation.

Various drill bits, drilling systems and related methods are provided. In one embodiment, a drill bit comprises a bit body having a face and a shank, at least one insert having a convex engagement surface coupled with the face and at least one wear insert coupled with the shank. In one particular embodiment, the at least one wear insert may be positioned immediately adjacent a coupling end of the shank. The at least one wear insert may include a superabrasive table which may be bonded with a substrate. The at least one wear insert includes a wear surface defined in the superabrasive table. In one embodiment, the superabrasive table may comprise polycrystalline diamond. Similarly, the inset having a convex engagement surface may include a superabrasive material, such as polycrystalline diamond, bonded with a substrate. Such a drill bit may be used, for example, in a top hammer percussion drilling operation.

A drill comprising a drill bit comprising a first drill part and a second drill part configured to slide relative to each other, wherein the first and second drill parts are pivotally coupled at one end to a first member and a second member respectively; a cam engaged with the first member and the second member, wherein the first and second members act as followers to slide the parts of the drill bit in a reciprocating motion with respect to each other, between a retracted and an extended position; and a wedge comprising a first angled surface engaged with the first member and a second angled surface engaged with the second member, the wedge configured to urge the drill bit to pivot in a first direction when the first member is moved towards the retracted position and to pivot in a second direction when the second member is moved towards the retracted position.

A drill comprising a drill bit comprising a first drill part and a second drill part configured to slide relative to each other, wherein the first and second drill parts are pivotally coupled at one end to a first member and a second member respectively; a cam engaged with the first member and the second member, wherein the first and second members act as followers to slide the parts of the drill bit in a reciprocating motion with respect to each other, between a retracted and an extended position; and a wedge comprising a first angled surface engaged with the first member and a second angled surface engaged with the second member, the wedge configured to urge the drill bit to pivot in a first direction when the first member is moved towards the retracted position and to pivot in a second direction when the second member is moved towards the retracted position.

The present invention relates to a fluid-operated percussion drill tool comprising an outer wear sleeve comprising a substantially cylindrical wall and having inner and outer surfaces. The tool also comprises a percussion bit having a head portion and a bit retaining portion and located at a forward end of the outer wear sleeve. The tool further comprises a sliding piston mounted for reciprocating movement within the outer wear sleeve to strike the percussion bit. The tool also includes a drive ring having a substantially cylindrical wall and comprising connection means adapted for connecting the drive ring to a drive means of the fluid-operated percussion drill tool. At least one flushing channel provides a fluid path to the cutting face of the bit for a flushing medium. A first portion of the at least one flushing channel extends longitudinally within the wall of the wear sleeve, a second portion of the at least one flushing channel extends longitudinally within the wall of the drive ring and a third portion of the at least one flushing channel extends through the head portion of the percussion bit to the cutting face of the bit.

The present invention relates to a fluid-operated percussion drill tool comprising an outer wear sleeve comprising a substantially cylindrical wall and having inner and outer surfaces. The tool also comprises a percussion bit having a head portion and a bit retaining portion and located at a forward end of the outer wear sleeve. The tool further comprises a sliding piston mounted for reciprocating movement within the outer wear sleeve to strike the percussion bit. The tool also includes a drive ring having a substantially cylindrical wall and comprising connection means adapted for connecting the drive ring to a drive means of the fluid-operated percussion drill tool. At least one flushing channel provides a fluid path to the cutting face of the bit for a flushing medium. A first portion of the at least one flushing channel extends longitudinally within the wall of the wear sleeve, a second portion of the at least one flushing channel extends longitudinally within the wall of the drive ring and a third portion of the at least one flushing channel extends through the head portion of the percussion bit to the cutting face of the bit.

A guide adapter for guiding a drill bit during percussion drilling is arranged between the drill bit and an elongated drill string extending along an axis. The guide adapter includes a sleeve shaped adapter body including a forward end with a first coupling arranged for connecting the guide adapter to the drill bit, and a rear end with a second coupling arranged for connecting the guide adapter to the drill string. A plurality of guiding elements extend substantially radially in relation to the axis from the adapter body. The guiding elements extend along 60% or less of the adapter body length and are arranged in the rear end. The guiding elements in the rear end have an extension in the radial direction substantially equal to a first radius of the drill bit and curved, straight or stepwise reduced radial extension towards the forward end.

A guide adapter for guiding a drill bit during percussion drilling is arranged between the drill bit and an elongated drill string extending along an axis. The guide adapter includes a sleeve shaped adapter body including a forward end with a first coupling arranged for connecting the guide adapter to the drill bit, and a rear end with a second coupling arranged for connecting the guide adapter to the drill string. A plurality of guiding elements extend substantially radially in relation to the axis from the adapter body. The guiding elements extend along 60% or less of the adapter body length and are arranged in the rear end. The guiding elements in the rear end have an extension in the radial direction substantially equal to a first radius of the drill bit and curved, straight or stepwise reduced radial extension towards the forward end.