Abstract: A drill crown (1) used for drilling purposes, especially for rotary percussion drilling of a mouth of a blast furnace. The drill crown (1) consists of a drilling head (4) provided with a plurality of hard material or hard metal inserts (6) and a base body (2) for connection to a drive element etc. in order to drive or impinge upon said drill crown. The hard material or hard metal inserts (6) are received in bores or openings (5) of the drill head (4). According to the invention, at least one hard material or hard metal insert (6) is provided with an at least partially curved or domed surface contour (11) on the end which is received in the drill head (4).

Abstract: The invention relates to a method and a device for the drilling, in particular the percussive or percussive rotary drilling of a hole (7) in earth or rock and for securing an anchorage in said hole. According to the invention, a bore hole (7) is created by a drill bit (1) mounted on a drill pipe (5) and a sliding sleeve (4) that surrounds the drill pipe (5) at a distance is simultaneously introduced. The invention is characterised in that a sliding sleeve (4) configured with a longitudinal slit (8) is introduced at least partially and rests substantially against the bore hole (7) during the drilling, whereby a reliable anchorage can be achieved with a simple construction by means of the sliding sleeve (4) with a longitudinal slit.

Abstract: A device for drilling holes, including a drill bit with a drilling or breaking surface, a drill rod for introducing a rotary or percussive force and for introducing a rinsing or cooling fluid into the drill bit and a sheath pipe which defines a hollow space between the drill rod and the inside of the sheath pipe and which is supported on the drill rod or which can be connected to the drill bit. In a drilling position, the sheath pipe is situated at a distance from the rear side of the drill bit facing away from the breaking surface and the drill bit can be introduced into a rinsing position for the hollow space between the sheath pipe and the drill rod with its rear side resting on the front end of the sheath pipe facing towards the drill bit or can be connected to the front end of the sheath pipe.

Abstract: The invention relates to a device for drilling, especially percussion drilling or rotary percussion drilling, holes (2), comprising a drill bit (3) with a drilling or breaking surface (14), a drill rod (4) for introducing a rotary or percussive force and for introducing a rinsing or cooling fluid into the drill bit (3) and a sheath pipe (5) which defines a hollow space (6) between the drill rod (4) and the inside of the sheath pipe (5) and which is supported on the drill rod (4) or which can be connected to the drill bit (3).

Abstract: The invention relates to a device (1) for the drilling, notably by percussion or rotary-percussion drilling, and draining of holes in soil or rock. A drill bit (2, 3) mounted on a drill rod (4) creates a bore hole and a jacket tube (6) is coupled to the drill rod (4) or the drill bit (2, 3). In the area adjacent to the drill bit (2, 3) the jacket tube (6) has at least one through hole which opens into an annular space embodied between the drill rod and the jacket tube. In the end area adjacent to the drill bit (2, 3) the jacket tube (6) is surrounded by at least one filter tube (7) having a plurality of through holes or slits (8) which are distributed especially evenly across its circumference. This allows for correspondingly safe and reliable drainage during boring, using simple measures.

Abstract: The present invention relates to an expansion anchor, in particular for mining, wherein at least one widenable expansion element is provided on the external side of the expansion anchor including an anchor rod, wherein the expansion element in a retention element fixed to the anchor rod is maintained in an abutment position during the insertion of the expansion anchor into a hole and the expansion element is expansible by the expansion element cooperating with a stop element anchored within the bore hole, wherein the expansion element is expansible through a movement of the anchor rod in the direction towards the opening of the bore hole.

Abstract: A jacket tube for a device for drilling holes and forming an anchorage in the earth or rock. The jacket tube is coupled with a drill pipe and/or a drill bit or a drill hammer and is configured with a plurality of through openings across its periphery. Once the borehole has been made, or after an anchor has been introduced, the jacket tube can be filled with a hardenable suspension. The jacket tube consists of at least one expanded metal element which has evenly distributed through openings and connecting elements, especially sleeves, at the ends for connecting to a drill bit and/or other jacket tube elements. The borehole is therefore easy to produce and the jacket tube can be anchored securely.

Abstract: The invention relates to a jacket tube (6) for a device for drilling holes and forming an anchorage in the earth or rock. The inventive jacket tube (6) is coupled with a drill pipe (3) and/or a drill bit (1) or a drill hammer and is configured with a plurality of through openings across its periphery. Once the borehole (2) has been made, or after an anchor has been introduced, the jacket tube can be filled with a hardenable suspension. According to the invention, the jacket tube consists of at least one expanded metal element (6) which has evenly distributed through openings (9) and connecting elements (7, 8), especially sleeves, at the ends for connecting to a drill bit (1) and/or other jacket tube elements (6). The borehole (2) is therefore easy to produce and the jacket tube (6) can be anchored securely.

Abstract: The invention relates to a device (1) for the drilling, notably by percussion or rotary-percussion drilling, and draining of holes in soil or rock. A drill bit (2, 3) mounted on a drill rod (4) creates a bore hole and a jacket tube (6) is coupled to the drill rod (4) or the drill bit (2, 3). In the area adjacent to the drill bit (2, 3) the jacket tube (6) has at least one through hole which opens into an annular space embodied between the drill rod and the jacket tube. In the end area adjacent to the drill bit (2, 3) the jacket tube (6) is surrounded by at least one filter tube (7) having a plurality of through holes or slits (8) which are distributed especially evenly across its circumference. This allows for correspondingly safe and reliable drainage during boring, using simple measures.

Abstract: A process and device for boring holes in soil or rocks, in particular for percussion or rotary percussion boring. A bore hole is formed by an annular drill bit mounted on boring rods and at the same time a jacket tube which surrounds the boring rods with a certain gap is introduced. The annular drill bit is flushed during boring by a flushing medium fed into the annular gap defined between the boring rods and the jacket tube. When boring is completed, a setting suspension is fed into the annular gap to form an anchorage with the boring rods. An anchorage can thus be obtained in a simple and reliable manner immediately after a bore hole is completed, in particular in loose or slack material, by a device having a simple design.

Abstract: In a process for drilling, in particular rotary percussion or percussion drilling, and lining holes in the ground or rocks, a hole is percussion and/or rotation drilled by a cutter mounted on boring rods and a lining is formed by a jacket tube. During drilling, at least one jacket tube coupled to the cutter is drawn in the axial direction by the cutter into the bore hole and once drilling is finished, the cutter is at least partially removed from the jacket tube together with the boring rods. In a device for drilling, in particular percussion or rotary percussion drilling, and lining holes in the ground or rocks, a cutter mounted on boring rods drills a bore hole by percussion and/or rotary drilling. The cutter is divided in the radial direction.

Abstract: A device for removing worn nozzle bricks or nozzle linings from the tap holes of metallurgical vessels including a spreading device, which can be introduced into the nozzle brick or tap hole, and a drive for extracting the nozzle brick or lining by means of the spreading device. The spreading device is arranged on a tool holder which can be displaced axially on a support, in particular a carriage. The tool holder can be connected to at least one drive. The tool holder advantageously includes an axial cavity in which a toothed shaft is rotatably mounted. The toothed shaft meshes with the toothing of at least two, and preferably three, spreading jaws which slide radially in the tool holder.

Abstract: A counterblow--tap hole--boring machine, especially for pneumatic rammer advance, combined with a counterblow device which serves as tapping equipment and a rotator for the actuation of a bar drill or a striking bar, consisting of sliding control valves which feed the main air to the consumer and back as exhaust, whereby an additional quick action ventilating valve quickly reduces the pressure of the used air, is provided with a mobile control piston (20) disposed on the distal end of the axially sliding control valve (15), which holds a valve disk (16) and controls the main air supply, between the housing (12) and the shaft of the sliding control valve (15), whereby a separate annular piston (18) alternatingly rests against the valve fitting surface (19) and a fitting surface (29) at the control piston (20).