Abstract: A direct tension indicator (2), including a base element (11) and a cover element (13) that is arranged on the base element (11) and at least one indicator element (4) that is arranged between the base element (11) and the cover element (13) in order to display an axial force acting between the base element and the cover element. The indicator element (4) includes a dilatant material.

Abstract: When it comes to an expansion plug (1) including an anchor bolt (2) with an expansion element (3) on a first end section (6) of the anchor bolt (2) having a longitudinal axis (10), preferably also including at least one force-applier (20) on the anchor bolt (2) in order to hold loads, and also including an expansion sleeve (4) surrounding the anchor bolt (2), the objective is to avoid an axial movement of the expansion sleeve (14), especially in the case of a drilled hole diameter in the lower tolerance range or in the case of a hollow space. The expansion plug (1) has at least one eccentric geometry, so that an expansion of the expansion sleeve (4) can be achieved by a rotational movement of the anchor bolt (2), especially around the longitudinal axis (10) as the axis of rotation (9).

Abstract: One or more embodiments of the present invention relate to a torque-limited attachment device, having a first head piece with at least one shaped element for the purpose of establishing a positive-fit connection to an attachment tool, and having a second head piece which has at least one threading, wherein both head pieces are connected to each other, forming at least one predetermined breaking point which breaks at a limit torque between the two head pieces such that a first breakaway surface, the same being functionally assigned to the first head piece, and a second breakaway surface, the same being functionally assigned to the second head piece, are created, and wherein at least the second head piece has a base material inside, the same having a corrosion-resistant surface coating.

Abstract: A direct tension indicator (2), including a base element (11) and a cover element (13) that is arranged on the base element (11) and at least one indicator element (4) that is arranged between the base element (11) and the cover element (13) in order to display an axial force acting between the base element and the cover element. The indicator element (4) includes a dilatant material.

Abstract: A sensor arrangement, for example, on an anchor bolt, including at least one sensor (10). At least one bypass element (20) with a dilatant material is arranged in the area of the sensor (10), whereby impact forces that act upon the sensor (10) can be dissipated via the dilatant material of the bypass element (20).

Abstract: A method for the production of torque-limited fastening devices, which each have a first head element with a contact for a fastening tool, and a second head element that is joined to the first head element via a welded joint that shears off at a predefined limit torque, said method providing a plurality of first head elements and second head elements having the same geometry, and in each case, a first head element and a second head element are welded together in a welding process that creates the welded joint. At least two welding processes are carried out employing at least one different welding parameter, so that different limit torques can be obtained for parts having the same geometry. A fastening device on a concrete anchor.

Abstract: One or more embodiments of the present invention relate to a torque-limited attachment device, having a first head piece with at least one shaped element for the purpose of establishing a positive-fit connection to an attachment tool, and having a second head piece which has at least one threading, wherein both head pieces are connected to each other, forming at least one predetermined breaking point which breaks at a limit torque between the two head pieces such that a first breakaway surface, the same being functionally assigned to the first head piece, and a second breakaway surface, the same being functionally assigned to the second head piece, are created, and wherein at least the second head piece has a base material inside, the same having a corrosion-resistant surface coating.

Abstract: A compensation element for leveling an add-on part (12) relative to a constructional component (13) has a base body (22) formed as a porous foam body in pores of which a curable material is provided.

Abstract: A multi-part expansion anchor (11) has, as a first part, an expansion sleeve (31) which has, as its elements, several expansion tabs (35) that are separated from each other by elongated slots (34) and has, as a second part, an expansion body (21) that can be pulled into the expansion sleeve (31), and a conical portion (22) for purposes of radially widening the expansion sleeve (31). The conical portion (22) has, as its elements, edges (24) running along the longitudinal axis (13). One of the parts of the expansion anchor (11) has an even number of appropriate elements, while the other part of the expansion anchor (11) has an odd number of appropriate elements.

Abstract: A fastening element has a shaft (12), and a tapping thread (21) carried by the shaft (12) and having at least one screw thread (22, 42) a section (23; 43) of which that adjoins the thread pilot (35), having a plurality of following one another thread steps (24, 25, 26, 27; 44, 45, 46, 47) having different cross-sections, with a cross-section of the at least one screw thread (22; 42) decreasing stepwise toward the thread pilot (35) from a thread step (24, 25, 26, 27; 44, 45, 46, 47) to a thread step (24, 25, 26, 27; 44, 45, 46, 47), with the thread steps (24, 25, 26, 27; 44, 45, 46, 47) having respective cutting edge-forming end surfaces (28, 29, 30, 31; 48, 49, 50, 51) aligned, at least partially, in a direction of the thread pilot (35).

Abstract: A method and apparatus for forming an internal thread on a base body is disclosed. A threading tool that features in parts at least one section having a thread-forming structure is inserted into an opening in the base body, and then, the entire internal thread is formed in the base body by a maximum rotation of the threading tool of 360°.

Abstract: A fastening assembly (11) for fastening a mounting part (6) to a constructional component (7) and including a fastening element (12) having a shaft (14) extending along a longitudinal axis (13), a holding portion (15) projecting radially at a first end of the shaft, and an anchoring portion (16) provided at the opposite, second, free end of the shaft for anchoring in the constructional component (7), and a shear force transmission element (21) provided on the fastening element (12) between the holding portion (15) and the anchoring portion (16) in the set state of the fastening assembly in the through-opening (8) of the mounting part (6), with the shear force transmission element (21) having, in a mounted state thereof, an axial length (L) that is smaller than its initial axial length and that is reduced from its initial axial length (H) by the holding portion (15) of the fastening element (12).

Abstract: A fastening element has a shaft (12), and a tapping thread (21) carried by the shaft (12) and having at least one screw thread (22, 42) a section (23; 43) of which that adjoins the thread pilot (35), having a plurality of following one another thread steps (24, 25, 26, 27; 44, 45, 46, 47) having different cross-sections, with a cross-section of the at least one screw thread (22; 42) decreasing stepwise toward the thread pilot (35) from a thread step (24, 25, 26, 27; 44, 45, 46, 47) to a thread step (24, 25, 26, 27; 44, 45, 46, 47), with the thread steps (24, 25, 26, 27; 44, 45, 46, 47) having respective cutting edge-forming end surfaces (28, 29, 30, 31; 48, 49, 50, 51) aligned, at least partially, in a direction of the thread pilot (35).

Abstract: In order to improve the holding force of a self-tapping concrete screw (1) in a hole (2) drilled in concrete (3), the invention proposes formation of the concrete screw (1) with two threads (8, 9) having different external diameters (d1, d2), the spacing (p1) of the thread (8) which has the smaller external diameter (d1) to the thread (9) which has the larger external diameter (d2) when seen from the front end (5) of the screw being smaller than the spacing (p2) of the thread (9) having the larger external diameter to the thread (8) having the smaller external diameter. The threads (8, 9) are preferably sawtooth threads.

Abstract: The invention relates to a method for anchoring an anchor (10) in an anchoring substrate (26), for example, of concrete, to an anchor (10) suitable for the method and to a drill suitable for the method. The invention proposes using the anchor (10) as tool for at least partial preparation of the anchoring hole (28) in the anchoring substrate (26) by high-frequency oscillatory working. The anchor (10) is, for example, an undercut expansion anchor, the expansible sleeve (14) of which forms the tool and is driven into an anchoring substrate (26) by being subjected to the action of high-frequency oscillations.

Abstract: The invention relates to an undercut anchor (10) comprising an anchor shaft (12) and a non-circular, for example triangular, anchor head (16). Said undercut anchor (10) is to be anchored in a borehole which is produced by ultrasound boring, has a cross-section matching that of the anchor head (16), and an undercut at the bottom thereof, that engages at the rear of the anchor head (16) following a rotation of 60°. A rotation-preventing element (18) is used to ensure that the anchor is rotationally fixed, said element having a cross-section matching the anchor head (16), and a recess (22) arranged on a front side thereof facing the anchor head (16) and corresponding thereto (16). When the anchor head (16) engages with the undercut of the borehole following the rotation, the rotation-preventing element (18) slides towards the anchor head (16) with the recess (22) thereof, holding the anchor head (16) in the borehole in a rotationally fixed manner, and thus securing the anchoring.

Abstract: A fastening element for a hard constructional component (6) includes a base body (12; 22; 42) extending along a longitudinal axis (19; 29; 49), a self-tapping thread (13; 23; 43) provided, at least regionwise, on the base body (12; 22; 42) and a height of which extends radially outwardly from the outer surface (18, 28, 48) of the base body (12; 22; 42), and at least one groove (16, 26, 45, 46, 47) provided on the base body (12; 22; 42) and a depth (T1, T2) of which extends radially inwardly from the outer surface (18; 28; 48) of the base body (12; 22; 42) and which is axially spaced from the self-tapping thread (13; 23; 43).

Abstract: The invention relates to a fastening element made from metal, having an expansion sleeve (2) and an expansion member (3), which expansion member (3) is axially displaceable on the shank of a threaded bolt (8), the threaded bolt (8) having on its forward end an end-stop in the form of an expander (9). On the threaded bolt (8), between the expander (9) and the expansion member (3), there is arranged a spacing element (10). In the event of a tensile load, the expander (9) enters the spacing element (10) and forms a deformation zone that corresponds to the length of the spacing element (10). As a result of the friction and deformation occurring in the deformation zone, overloads are absorbed and, consequently, the fastening element is prevented from coming out or the threaded bolt from breaking off.