Abstract: A threaded joint interconnects male and female parts of rock-drilling equipment, the female parts including an internal trapezoidal thread in the form of a helix thread ridge, which is delimited by a top and two flanks, a groove, having a bottom, running between two tops, and which thread ridge extends a plurality of turns between a front end and a rear end, the thread top touching an imaginary cylinder or cone that is concentric with a center axis of the female part. The bottom of the thread groove has a concave and partially circular cross-section shape along at least a part of the extension of the groove, and transforms into flanks via concave radius transitions, the radii of which decrease in the direction from the front end of the thread toward the rear one, at the same time as the radius of the groove bottom increases in the same direction.

Abstract: A female part intended for top hammer-drilling equipment includes a thread in the form of a ridge in a wall. The ridge is delimited by a crest and two flanks between which a likewise helical groove having a bottom runs. An end the of the groove is defined by a borderline, which separates the groove bottom from a part surface formed in the inside of the wall, the width of which part surface successively decreases in the peripheral direction, and which has a rotationally symmetrical shape essentially similar to the rotationally symmetrical basic shape of the thread.

Abstract: A drill bit for percussive rock drilling of the type that comprises a front head and a tubular skirt, which extends rearward from the head to a rear, ring-shaped end and includes an internal thread for the transfer of combined impact and rotary motions to the drill bit is disclosed. The rear end of the skirt is, via an unelastic joint, e.g., a friction weld, united to a front end of a sleeve having an envelope surface, from which a plurality of projections are peripherically spaced-apart from each other project, e.g., ridges, having the purpose of guiding the drill bit in the drill hole. By assembling the drill bit of two parts, the internal thread can be turned with high accuracy and smoothness, at the same time as the drill bit is given an inherent good controllability. In an additional aspect, a method for the manufacture of such a drill bit is also disclosed.

Abstract: The invention relates to a threaded joint for rock-drilling equipment of the type that includes female and male parts that are interconnected via threaded joints. The invention is particularly advantageous in connection with female parts (1) of the type that includes an internal trapezoidal thread in the form of a helix thread ridge, which is delimited by a top and two flanks (12a, 12b), a groove (13), having a bottom (14), running between two tops, and which thread ridge extends a plurality of turns between a front end and a rear end, the thread top touching an imaginary cylinder or cone that is concentric with a centre axis of the female part.

Abstract: The present invention A relates to a female part intended for top hammer-drilling equipment and a method for manufacturing female parts. The female part has a thread in the form of a ridge (2) in a wall (5). The ridge is delimited by a crest (9) and two flanks (10) between which a likewise helical groove (11) having a bottom (12) runs. An end the of the groove (11) is defined by a borderline (18), which separates the groove bottom (12) from a part surface (19) formed in the inside of the wall (5), the width of which part surface successively decreases in the peripheral direction, and which has a rotationally symmetrical shape essentially similar to the rotationally symmetrical basic shape of the thread (1).

Abstract: A drill bit for percussive rock drilling of the type that comprises a front head and a tubular skirt, which extends rearward from the head to a rear, ring-shaped end and includes an internal thread for the transfer of combined impact and rotary motions to the drill bit is disclosed. The rear end of the skirt is, via an unelastic joint, e.g., a friction weld, united to a front end of a sleeve having an envelope surface, from which a plurality of projections are peripherically spaced-apart from each other project, e.g., ridges, having the purpose of guiding the drill bit in the drill hole. By assembling the drill bit of two parts, the internal thread can be turned with high accuracy and smoothness, at the same time as the drill bit is given an inherent good controllability. In an additional aspect, a method for the manufacture of such a drill bit is also disclosed.

Abstract: A rock drill tool, which comprises a rock drill bit as well as a drill rod detachably connected with the rock drill bit, where the joint between the rock drill bit and the drill rod is effected by means of a conical connection. The rock drill bit has a generally conical cavity, and the drill rod has a generally conical portion. The conical cavity is provided with a crest-shaped projection, which has a rectilinear extension along the envelope surface of the conical cavity, that the conical portion has a groove, which has a generally rectilinear extension along the envelope surface of the conical portion, and that the crest-shaped projection is received in the groove. A rock drill bit and a production method are also disclosed.

Abstract: A tool for mining rock by means of undercutting includes an attachment part which defines a center longitudinal axis, and a holder mounted to the attachment part by bearings for rotation relative thereto about the axis. An outer surface of the holder includes a circumferentially extending first groove. A button disk is mounted on the cutter and includes an inner surface having a circumferentially extending second groove. One of the grooves is superimposed relative to the other groove to define therewith a space. A wire extends within the space to hold the button disk on the cutter.

Abstract: The present invention relates to a grinding cup and a wear part for grinding of cutting inserts of a rock drill bit. The grinding cup is provided to be rotatably mounted in a grinding machine. The grinding cup is provided to perform grinding of cutting inserts of a rock drill bit. The grinding cup comprises a shank, a flush channel, and a wear part having a recess. The grinding cup has a center axis and is provided with vibration dampening means. The wear part is resilient in the grinding cup in at least the axial direction relative to the shank and the vibration dampening means forms contact surfaces with cooperating parts. The contact surfaces have substantially the same radial extension.

Abstract: A grinding cup includes a wear part having a cavity at its front end, the cavity configured for grinding a button of a rock drill bit. A flush channel extends forwardly through the wear part and terminates at the cavity for conducting a flushing medium thereto. The flush channel is spaced from a center axis of rotation of the grinding cup by a distance greater than 2% and less than 30% of a largest diameter of the cavity.