Abstract: A fastener includes an anchor bolt and a nut. The nut has a nut hole and an internal thread. The anchor bolt has an anchor portion and a threaded rod that has an external thread and that is connected to the anchor portion. The nut is arranged on the threaded rod and the internal thread of the nut threadedly engages the external thread of the threaded rod. The nut has a rearward nut section, a forward nut section, and an outside shoulder for load transfer into the nut which is located between the forward nut section and the rearward nut section and which faces the anchor portion of the anchor bolt. The internal thread of the nut extends at least in the forward nut section and threadedly engages the external thread of the threaded rod at least in the forward nut section.

Abstract: A drilling tool includes a hydraulically driven device (21) for advancing a drilling head (2) in a bore (5), and a flow limiter (30) arranged in a hydraulic conduit (25) of the advancing device (21) for adjusting an advancing speed of the drilling head (2) in the bore (5), with the flow limiter (30) having a pressure-actuated adjusting member (38) for adjusting flow of a hydraulic fluid in the hydraulic conduit means (25) in accordance with a flow volume of a rinsing fluid (7) for rinsing the bore.

Abstract: An adaptor for setting a self-drilling, chemically anchorable, fastening element (5) includes a rotor member (21) rotatably supported in the adaptor housing (36) and having at its opposite ends (23,25) respectively, a coupling section (24) for connecting the rotor member (21) with a drilling tool (8) for joint rotation therewith, and a coupling receptacle (26) for fixedly receiving a free end (6) of the fastening element (5). Support elements (52,53) are provided in one of two housing parts (41,51) for rotatably supporting the rotor member (21). Sealing elements (42), which are provided in another housing part (41), for a connection channel section (32) that connects a connection opening (37) in the housing (36) for the ejection medium (4) with a feeding channel (31) in the rotor member (21).

Abstract: An adapter member for connecting a self-drilling rock anchor (1; 31; 69) with a chuck (6) of a drilling tool, includes a sleeve-shaped section (17; 37) having a bottom (20; 40; 60; 80) provided at an end (19; 39) of the sleeve-shaped section (17; 37) for forming a receiving space (21) for connection with an end (4; 34) of the rock anchor (1; 31; 69), and a seal (23; 43; 63; 83) arranged in a region of the bottom (20; 40; 60; 80) and extending from the receiving space (21) to at least a plane (E1; E2; E3; E4) defined by the bottom.

Abstract: A road milling machine having a milling roller with a plurality of chisels. A signal receiving unit is assigned to a machine component which is directly or indirectly involved in the milling process or to another machine component. The signal receiving unit detects an operating condition of the machine component and is connected to a signal emitting unit. An optical detecting device may be assigned to the road milling machine, whereby operations are made easier and the milling pattern is optimized.

Abstract: An adapter (21) for a self-drilling, chemically anchorable fastening element (11) is described, having a shank (12) with a first end (13) on which a drill bit head (16) is provided, and with a second, free end (14), the second end (14) of the shank (12) being provided with a threadlike outer profile (15). The adapter (21) which may be placed on the second, free end (14) of the shank (12) has an external engagement device on one end for a rotary tool receptacle of a drill which is to be used, a base section provided on the other end at a distance from the engagement means, and a hollow cylindrical connecting sleeve section which connects the base section and the engagement device. The connecting sleeve section has a threadlike inner profile which corresponds to the threadlike outer profile (15) on the shank (12). The adapter (21) is formed by a first element part (22) and a second element part (32) which are detachably connected to one another via a clutch device (41).

Abstract: A fastening element has a drilling head (21) provided at one end (16) of anchor tube (12) and having at least one inlet opening (23) that opens toward the receiving chamber (13) of the anchor tube (12), and at least one through-opening (24) that opens outwardly for passing of the hardenable mass therethrough, and a mixing element (31) for the hardenable mass and which is located in the drilling head (21) between the at least one inlet opening (23) and the at least one through-opening (24).

Abstract: A drilling tool includes a hydraulically driven device (21) for advancing a drilling head (2) in a bore (5), and a flow limiter (30) arranged in a hydraulic conduit (25) of the advancing device (21) for adjusting an advancing speed of the drilling head (2) in the bore (5), with the flow limiter (30) having a pressure-actuated adjusting member (38) for adjusting flow of a hydraulic fluid in the hydraulic conduit means (25) in accordance with a flow volume of a rinsing fluid (7) for rinsing the bore.

Abstract: A method of setting a self-drilling chemically anchorable fastening element (11; 51) includes mounting of an adaptor (31) on the second end (18; 58) of the shaft (12; 52) of the fastening element (11; 51), connecting the drilling power tool (41) with the adaptor (31), the adaptor having an engagement element (32) for the tool chuck (42), drilling a borehole (7) in the constructional component (6) with the self-drilling fastening element (11; 51), rotating the fastening element (11; 51) in a first rotational direction (R1), forcing out the hardenable mass located in the receiving space of the shaft of the fastening element from the fastening element with an ejection device, and pre-stressing the fastening element (11; 51) after at least partial hardening of the hardenable mass (15; 55) by rotating the adaptor (31) in a second rotational direction (R2) opposite the first rotational direction (R1), with at least a section of the adaptor (31) being displaced in a direction of the first end (17; 57) of the shaft (

Abstract: An adaptor for setting a self-drilling, chemically anchorable, fastening element (5) includes a rotor member (21) rotatably supported in the adaptor housing (36) and having at its opposite ends (23, 25) respectively, a coupling section (24) for connecting the rotor member (21) with a drilling tool (8) for joint rotation therewith and a coupling receptacle (26) provided for fixedly receiving a free end (6) of the fastening element (5), support elements (52, 53) provided in one of two housing parts (41, 51) for rotatably supporting the rotor member (21), and sealing elements (42) provided in another housing part (41) for sealing a connection channel section (32) that connects a connection opening (37) in the housing (36) for the ejection medium (4) with a feeding channel (31) in the rotor member (21).

Abstract: A separate drilling head has a distal end which contacts the material to be drilled, and a proximal end which is attached to a drive mechanism. The drive mechanism drives the separate drilling head into the material. The separate drilling head is forcelockingly secured in a thin-walled hollow anchor tube, and the separate drilling head includes a hard metal cutter element, and a substantially axially-oriented, axial stop shoulder at the proximal end that passes into a circumferentially closed, outer cone.

Abstract: A self-drilling connection anchor (10) includes an anchor tube (11), a drilling head (13) provided at the first end (12) of the anchor tube (11), an inner tube (15) arranged in the anchor tube (11) and having an interior space (16) for receiving an ejectable mass (30), a first axial, with respect to the longitudinal axis (L) defined by the anchor tube, opening (18) provided in a region of the second free end (14) that communicates with the interior space (16) of the inner tube (15), at least one outlet opening (20) provided in a region of the drilling head (13), and at least one second radial, with respect to the longitudinal axis (L), opening (19) provided in the region of the free second end (14) and communicating with the at least one outlet opening (20) via an intermediate space (17) formed between the anchor tube (11) and the inner tube (15).

Abstract: A fastening element has a drilling head (21) provided at one end (16) of anchor tube (12) and having at least one inlet opening (23) that opens toward the receiving chamber (13) of the anchor tube (12), and at least one through-opening (24) that opens outwardly for passing of the hardenable mass therethrough, and a mixing element (31) for the hardenable mass and which is located in the drilling head (21) between the at least one inlet opening (23) and the at least one through-opening (24).

Abstract: A road milling machine having a milling roller with a plurality of chisels. A signal receiving unit is assigned to a machine component which is directly or indirectly involved in the milling process or to another machine component. The signal receiving unit detects an operating condition of the machine component and is connected to a signal emitting unit. An optical detecting device may be assigned to the road milling machine, whereby operations are made easier and the milling pattern is optimized.

Abstract: A self-drilling rock anchor includes a drilling head (16; 46) provided at one end (13) of the receiving body (12), an inner tube (21) for receiving a pressurable-out hardenable mass (26) and provided in the receiving body (12) and having an outlet opening (22) spaced from the drilling head (16; 46), and a mixing member (31; 61) displaceably supported in the inner tube (21), with the drilling head (16; 46) having a receptacle (18; 48) adjacent to the mixing member (31; 61) for receiving a free end (32; 62) of the mixing member (21; 61) and a through-opening (17) for the hardenable mass (26), and the receptacle (18; 48) of the drilling head (16; 46) having a centering section (20; 50) that cooperates with a counter-centering section (33; 63) provided at the free end (32; 62) of the mixing member (31; 61) adjacent to the drilling head (16; 46).

Abstract: A road milling machine having a milling roller with a plurality of chisels. A signal receiving unit is assigned to a machine component which is directly or indirectly involved in the milling process or to another machine component. The signal receiving unit detects an operating condition of the machine component and is connected to a signal emitting unit. An optical detecting device may be assigned to the road milling machine, whereby operations are made easier and the milling pattern is optimized.

Abstract: A hard material bit for a drilling head (2) includes at least two cutting edges (4a, 4b) over a bit length (L) in a direction transverse to a bit drilling axis (A), with one of the at least two cutting edges (4a) being located adjacent to a first side surface (5a) of the bit and another of the at least two cutting edges being located adjacent to the second side surface (5b) of the bit spaced form the first side surface (5a) by a thickness (D), the bit further including a base surface (6) located opposite the cutting edges (4a, 4b) at a height (H) along the drilling axis (A), and two recesses (7a, 7b) formed in respective longitudinal portions of the base surface (6) located opposite the one and the another of the at least two cutting edges (4a, 4b), respectively, and extending up to the first and second side surfaces (5a, 5b), respectively.

Abstract: A rock drilling head (1) with a drilling diameter (D) between 25 mm and 60 mm and formed of no more than five separate parts, has at least one rinsing channel (2) formed in the outer surface (3) of the drilling head and expanding from the outer surface (3) inward in form of a nozzle, the rinsing channel having a diameter (S) amounting to between 1/20 and ? of the drilling diameter (D).

Abstract: A separate drilling head (1) which is to be forcelockingly secured in a thin-walled hollow anchor tube (3), includes a hard metal cutter element (2), and a drive-side, substantially axially oriented, axial stop shoulder (4) that passes into a circumferentially closed, outer cone (5).

Abstract: A drilling head, with a cross-sectional dimension (E) in a direction normal to the drilling axis (A), includes two diametrically opposite, free-standing, prong-shaped support members (2) provided at a head-side of the drilling head, and a diametrically extending hard material element (3) connected with the two support members (2) and which forms at least one cutter (4) at its head, in an axial direction, side and which lies freely in a central region (Z) of the drilling axis (A) at a stem, in the axial direction, side of the drilling head (1).