Abstract: A fastening device (21) for mounting on a mounting rail (11) having a rear-engagement member (22) which is configured to be introduced into the mounting opening (15) and to engage behind the rims (14) of the mounting opening (15) of the mounting rail (11); including a tensioning device (32) which cooperates with the rear-engagement member (22) and has a longitudinal axis, for clamping the fastening device (21) to the mounting rail (11); including a contact plate (42) for resting on the outside of the mounting rail (11) that has a feed-through opening for a part of the tensioning device (32); and a spring element (52) configured between the contact plate (42) and the rear-engagement member (22) for preloading the rear-engagement member (22) circumferentially with respect to the longitudinal axis (34) of the tensioning device (32); including a holding device (62) between the rear-engagement member (22) and the contact plate (42) for holding the rear-engagement member (22) in the preloaded position; upon release

Abstract: In a fastening device for attachment to a mounting rail, comprising a toggle element for introduction into a mounting opening and engagement on the back of edges of the mounting opening of the mounting rail, a bracing device that works together with the toggle element, especially a clamping bolt, for clamping the fastening device on the mounting rail, a contact plate for outside contact on the mounting rail that has a pass-through opening for at least one part of the bracing device, a spring as compression and torsion spring, a holding device between the toggle element and the contact plate for holding the toggle element in the braced position, whereby during loosening of the holding device, the toggle element may be transferred by the spring from an introduction position to a braced position in engagement with one of the edges of the mounting opening.

Abstract: A chiplessly thread-forming screw has a stem (11) at one end of which a tip (13) is provided and at another end of which a head (14) is provided, and which has a pointed conical section (21) extending from the tip (13) in a direction of the head (14), a cylindrical section (25) arranged between the first pointed section (21) and the head (14), a first cambered section (22) adjoining the pointed conical section (21) in the direction of the head, and a second cambered section (24) arranged between the first cambered section (22) and the cylindrical section (25) and an outer surface (16) of which has a second curvature radius (R2) unequal to the first curvature radius (R1) of the outer surface (12) of the first cambered section (21).

Abstract: The invention relates to a fastener (21) for arranging a rod element (9) on a mounting channel, said fastener (21) including an engaging part (22) that can be inserted and made to engage behind edges (14) of an installation opening of the mounting channel, whereby the engaging part (22) has an opening (25) with an internal thread for the rod element, a stop plate (42) for making contact on the outside of the mounting channel having a hole (44) through which the rod element (9) passes, and flexible connection elements (32) that connect the engaging part (22) to the stop plate (42; 76; 96) at a distance from each other. Moreover, a nut element (52) that has a hole (53) with an internal thread and that serves to secure the rod element (9) to the mounting channel can be rotatably held on the stop plate (42) using a holding device (62).

Abstract: A segmental hard material insert for a working tool has a planar polycrystalline diamond layer (13) having, in its layer plane, a main cutting element (16, 36) and a contact edge (15) located opposite the main cutting element, with the main cutting element (16, 36) having two, facing outwardly, convex cutting sections (17, 27; 37, 47) and a smooth, facing outwardly, concave transitional region (19; 39, 49) connecting the two convex cutting sections (17, 27; 37, 47), and with the apex (20; 40) of the transitional region (19; 39, 47) being located on a central line of the main cutting element (16; 36).

Abstract: The invention relates to a fastener (21) for arranging a rod element (9) on a mounting channel, said fastener (21) including an engaging part (22) that can be inserted and made to engage behind edges (14) of an installation opening of the mounting channel, whereby the engaging part (22) has an opening (25) with an internal thread for the rod element, a stop plate (42) for making contact on the outside of the mounting channel having a hole (44) through which the rod element (9) passes, and flexible connection elements (32) that connect the engaging part (22) to the stop plate (42; 76; 96) at a distance from each other. Moreover, a nut element (52) that has a hole (53) with an internal thread and that serves to secure the rod element (9) to the mounting channel can be rotatably held on the stop plate (42) using a holding device (62).

Abstract: A fastening device (21) for mounting on a mounting rail (11) having a rear-engagement member (22) which is configured to be introduced into the mounting opening (15) and to engage behind the rims (14) of the mounting opening (15) of the mounting rail (11); including a tensioning device (32) which cooperates with the rear-engagement member (22) and has a longitudinal axis, for clamping the fastening device (21) to the mounting rail (11); including a contact plate (42) for resting on the outside of the mounting rail (11) that has a feed-through opening for a part of the tensioning device (32); and a spring element (52) configured between the contact plate (42) and the rear-engagement member (22) for preloading the rear-engagement member (22) circumferentially with respect to the longitudinal axis (34) of the tensioning device (32); including a holding device (62) between the rear-engagement member (22) and the contact plate (42) for holding the rear-engagement member (22) in the preloaded position; upon release

Abstract: A segmental hard material insert for a working tool has a planar polycrystalline diamond layer (13) having, in its layer plane, a main cutting element (16, 36) and a contact edge (15) located opposite the main cutting element, with the main cutting element (16, 36) having two, facing outwardly, convex cutting sections (17, 27; 37, 47) and a smooth, facing outwardly, concave transitional region (19; 39, 49) connecting the two convex cutting sections (17, 27; 37, 47), and with the apex (20; 40) of the transitional region (19; 39, 47) being located on a central line of the main cutting element (16; 36).

Abstract: A chiplessly thread-forming screw has a stem (11) at one end of which a tip (13) is provided and at another end of which a head (14) is provided, and which has a pointed conical section (21) extending from the tip (13) in a direction of the head (14), a cylindrical section (25) arranged between the first pointed section (21) and the head (14), a first cambered section (22) adjoining the pointed conical section (21) in the direction of the head, and a second cambered section (24) arranged between the first cambered section (22) and the cylindrical section (25) and an outer surface (16) of which has a second curvature radius (R2) unequal to the first curvature radius (R1) of the outer surface (12) of the first cambered section (21).

Abstract: A concrete drill for a rotary and percussively driven hand tool machine with a cutting part (1) and a striking part (2) that is axially and limited displaceable relative to the cutting part (1). Each of the cutting part (1) and the striking part (2) have a respective facial surface work area for machining a bore hole surface. The respective facial surface work area of the cutting part (1) and the striking part (2) radially overlap upon rotation of the concrete drill.

Abstract: A working tool for machining mineral constructional components, in particular, for machining mineral constructional components, mineral foundations, and the like with an ultrasonic tool, has a carrier body which is formed of an unalloyed hardened steel having a carbon content from 0.2% to 0.8% and which is provided with at least one cutting element.

Abstract: A concrete drill for a rotary and percussively driven hand tool machine with a cutting part (1) and a striking part (2) that is axially and limited displaceable relative to the cutting part (1). Each of the cutting part (1) and the striking part (2) have a respective facial surface work area for machining a bore hole surface. The respective facial surface work area of the cutting part (1) and the striking part (2) radially overlap upon rotation of the concrete drill.