Abstract: Herein a bolt (2) comprising an elongated body (4) with a central axis (C) is described. The elongated body (4) is in a first end (6) provided with a first thread (8) and in a second end (10) with a second thread (12). An intermediate part (14) of the elongated body (4) is provided with a collar (16). The collar (16) is provided with at least one first flat surface (18), which first flat surface (18) extends substantially in parallel with the central axis (C). Further, a rock drill comprising housing parts held together by at least one bolt (2) is described.

Abstract: A circular cylindrical striker member 2 for a drilling machine adapted to transfer kinetic energy to an impulse receiving member 4. The striker member has a diameter dmax, and includes a side surface 12 and an impulse surface (6). The striker member is adapted to transfer the kinetic energy to the impulse receiving member by a ring shaped active surface of the impulse surface, wherein the ring shaped active surface is concentric with regard to the cross section of the striker member, has a diameter da, where da<dmax, and has a width wa that during the contact moment with the impulse receiving part is less than 0.2 dmax.

Abstract: Herein a bolt (2) comprising an elongated body (4) with a central axis (C) is described. The elongated body (4) is in a first end (6) provided with a first thread (8) and in a second end (10) with a second thread (12). An intermediate part (14) of the elongated body (4) is provided with a collar (16). The collar (16) is provided with at least one first flat surface (18), which first flat surface (18) extends substantially in parallel with the central axis (C). Further, a rock drill comprising housing parts hold together by at least one bolt (2) is described.

Abstract: The present invention relates to a pulse generating device for inducing a shock wave in a tool, wherein the said pulse generating device comprises an impact means (201; 301) for transferring energy to a drill string (202) connected to the said tool, and wherein the energy transfer gives rise to the said shock wave, in which the said energy is mainly constituted by elastic energy stored in the impact means (201; 301) and/or an energy store. The device comprises control means for controlling the interaction of the impact means (201; 301) with the drill string (202), wherein the said control means for controlling the interaction of the impact means (201; 301) with the drill string (202) comprises a motor (207; 307), and wherein the said motor (207; 307) is designed to, through rotation, alternately open ducts for pressurization and depressurization of at least one drive surface (205) acting upon the said impact means.

Abstract: A circular cylindrical striker member 2 for a drilling machine adapted to transfer kinetic energy to an impulse receiving member 4. The striker member has a diameter dmax, and includes a side surface 12 and an impulse surface (6). The striker member is adapted to transfer the kinetic energy to the impulse receiving member by a ring shaped active surface of the impulse surface, wherein the ring shaped active surface is concentric with regard to the cross section of the striker member, has a diameter dawhere da<dmax, and has a width wa that during the contact moment with the impulse receiving pan is less than 0.2dmax.

Abstract: A boom arrangement (7) for a rock drill rig (5) including a feed beam unit (8) for displaceable reception of at least one rock drilling machine (10, 10?), a support unit (13) for connection to and support of a rotator unit (12), a boom unit (11) between the rotator unit (12) and the feed beam unit (8) for displacement of the feed beam unit in planes essentially at right angle to a main plane (P) for the support unit (13), wherein the rotator unit (12) is arranged for rotating the feed beam unit (8) around an axis (A), which is essentially-perpendicular to said main plane (P), wherein the support unit (13) is connectable to a vehicle unit being part of the rock drill rig (5), and being arranged for displacing the rock drill rig. The support unit (13) has joint connecting elements (14) being sidewardly connectable for connection to a sidewardly directed carrier device (15, 17) which is attachable to the vehicle unit, and a lower abutment side (16) for lying supporting against an outer substrate.

Abstract: A rotation device (12) for rotation of equipment (13) fastened at the region of a distal end of a boom (9,11), which has a general longitudinal axis, and which is part of a boom device (3) which is fastenable to a carrier (2) for a mining or constructions work rig, wherein the rotation device includes a first rotation unit (R1) arranged to rotate the equipment around an axis (A1) which is essentially parallel to the longitudinal axis of the boom and a second rotation unit (R2) which is arranged to rotate the equipment around an axis (A2), which forms an angle with the longitudinal axis of the boom. The rotation units (R1, R2) are fastened to an angle unit (12?), which is included in the rotation device (12) and has rotational axes (A1, 21; A2,22) extending at an angle with respect to each other, and are connectable to the boom (9,11) as well as to said equipment (13). The invention also concerns a mining or constructions work rig and a boom.

Abstract: The object of the invention is to provide a telescopic feeder which is easier to handle. A first beam is intended to be used in sliding cooperation with a second beam in a telescopic feeder for a rock drilling machine. The first beam comprises at least one guiding stud intended to be guided into a recess in the second beam as the second beam and the first beam are retracted to an end position. The guiding stud is used for locking the first beam in relation to the second beam in a fixed position as the telescopic feeder is fully retracted to an end position.

Abstract: The object of the invention is to provide a drilling device which is compact and has good sliding properties. The object is achieved by an upper beam for use with a lower beam in a telescopic feeder for a drilling device for rock drilling. The upper beam extends along a longitudinal axis and has a generally U-shaped cross section comprising a bottom wall and a first and a second side wall. Each side wall has an inward surface and an outward surface. The upper beam comprises a cooperating member intended for sliding cooperation with the lower beam. The cooperating member comprises an attachment structure extending outwardly from each outward surface of each side wall. Each attachment structure is intended for fixed mounting of a crank block bracket, which crank block bracket faces the outward surface of each side wall.

Abstract: The invention relates to a damping device for an output shaft (26) in a gearbox (14, 16), where the gearbox (14, 16) is arranged for rotation of a rotational degree of freedom (Z4,Z5) in a rock-drilling rig (2), and thus for positioning of the same, and where the damping device (18) comprises a brake (38) that acts on the output shaft (26) of the gearbox (14, 16), which brake (38) acts as an oscillation damper for the movement of the output shaft (26), whereby a gearbox (14, 16) with play can be used for applications that require a high degree of precision such as positioning, e.g. measuring a position for a drill hole. The invention also relates to a gearbox (14, 16) and a rock-drilling rig (2) with damping device (18), respectively.

Abstract: The present invention relates to a pulse generating device for inducing a shock wave in a tool, wherein the said pulse generating device comprises an impact means (201; 301) for transferring energy to a drill string (202) connected to the said tool, and wherein the energy transfer gives rise to the said shock wave, in which the said energy is mainly constituted by elastic energy stored in the impact means (201; 301) and/or an energy store. The device comprises control means for controlling the interaction of the impact means (201; 301) with the drill string (202), wherein the said control means for controlling the interaction of the impact means (201; 301) with the drill string (202) comprises a motor (207; 307), and wherein the said motor (207; 307) is designed to, through rotation, alternately open ducts for pressurization and depressurization of at least one drive surface (205) acting upon the said impact means.

Abstract: A boom arrangement (7) for a rock drill rig (5) including a feed beam unit (8) for displaceable reception of at least one rock drilling machine (10, 10?), a support unit (13) for connection to and support of a rotator unit (12), a boom unit (11) between the rotator unit (12) and the feed beam unit (8) for displacement of the feed beam unit in planes essentially at right angle to a main plane (P) for the support unit (13), wherein the rotator unit (12) is arranged for rotating the feed beam unit (8)around an axis (A), which is essentially-perpendicular to said main plane (P), wherein the support unit (13) is connectable to a vehicle unit being part of the rock drill rig (5), and being arranged for displacing the rock drill rig. The support unit (13) has joint connecting elements (14) being sidewardly connectable for connection to a sidewardly directed carrier device (15, 17) which is attachable to the vehicle unit, and a lower abutment side (16) for lying supporting against an outer substrate.

Abstract: The object of the invention is to provide a drilling device which is compact and has good sliding properties. The object is achieved by an upper beam for use with a lower beam in a telescopic feeder for a drilling device for rock drilling. The upper beam extends along a longitudinal axis and has a generally U-shaped cross section comprising a bottom wall and a first and a second side wall. Each side wall has an inward surface and an outward surface. The upper beam comprises a cooperating member intended for sliding cooperation with the lower beam. The cooperating member comprises an attachment means extending outwardly from each outward surface of each side wall. Each attachment means is intended for fixed mounting of a crank block bracket, which crank block bracket faces said outward surface of each side wall.

Abstract: The invention relates to a sensor assembly in a gearbox which is used for positioning, where the sensor assembly comprises a relative to the gearbox housing (18) fixed sensor (20), and where the angle between the gearbox housing (18) and the output shaft (26) of a gearbox (14, 16) is measured using a to the output shaft (26) fixed and to the sensor (20) connected shaft (28), whereby a sensor assembly which measures the angle in the gearbox (14, 16) including the play in the gearbox (14, 16) is attained, which gives increased precision at the same time as gearboxes (14, 16) with play can be utilized for accurate angle positioning.

Abstract: The object of the invention is to provide a telescopic feeder which is easier to handle. A first beam is intended to be used in sliding cooperation with a second beam in a telescopic feeder for a rock drilling machine. The first beam comprises at least one guiding stud intended to be guided into a recess in the second beam as the second beam and the first beam are retracted to an end position. The guiding stud is used for locking the first beam in relation to the second beam in a fixed position as the telescopic feeder is fully retracted to an end position.

Abstract: The invention relates to a damping device for an output shaft (26) in a gearbox (14,16), where the gearbox (14,16) is arranged for rotation of a rotational degree of freedom (Z4,Z5) in a rock-drilling rig (2), and thus for positioning of the same, and where the damping device (18) comprises a brake (38) that acts on the output shaft (26) of the gearbox (14,16), which brake (38) acts as an oscillation damper for the movement of the output shaft (26), whereby a gearbox (14,16) with play can be used for applications that require a high degree of precision such as positioning, e.g. measuring a position for a drill hole. The invention also relates to a gearbox (14,16) and a rock-drilling rig (2) with damping device (18), respectively.

Abstract: The invention relates to a sensor assembly in a gearbox which is used for positioning, where the sensor assembly comprises a relative to the gearbox housing (18) fixed sensor (20), and where the angle between the gearbox housing (18) and the output shaft (26) of a gearbox (14, 16) is measured using a to the output shaft (26) fixed and to the sensor (20) connected shaft (28), whereby a sensor assembly which measures the angle in the gearbox (14, 16) including the play in the gearbox (14, 16) is attained, which gives increased precision at the same time as gearboxes (14, 16) with play can be utilized for accurate angle positioning.

Abstract: A rotation device (12) for rotation of equipment (13) fastened at the region of a distal end of a boom (9,11), which has a general longitudinal axis, and which is part of a boom device (3) which is fastenable to a carrier (2) for a mining or constructions work rig, wherein the rotation device includes a first rotation unit (R1) arranged to rotate the equipment around an axis (A1) which is essentially parallel to the longitudinal axis of the boom and a second rotation unit (R2) which is arranged to rotate the equipment around an axis (A2), which forms an angle with the longitudinal axis of the boom. The rotation units (R1, R2) are fastened to an angle unit (12), which is included in the rotation device (12) and has rotational axes (A1, 21; A2,22) extending at an angle with respect to each other, and are connectable to the boom (9,11) as well as to said equipment (13). The invention also concerns a mining or constructions work rig and a boom.

Abstract: A rock drilling device has a feed beam (1) and a rock drilling machine (2) movable along the feed beam. The rock drilling machine is fed along the feed beam (1) by a feed line (7), which is routed over a sheave (6) arranged at the movable end (5) of a pressure medium cylinder (3). A further line (8) is arranged between two points (9, 10) which are fixed relative to the movable end of the pressure medium cylinder. The further line (8) is connected to a measuring device (11) which is fixed to the feed beam (1) for measuring displacement of the rock drilling machine (2) along the feed beam.