HIGH-STRENGTH FASTENING DEVICE

Abstract

The invention relates to a fastening device for fastening at least one mounting element to a threaded bolt, including a nut having a threaded bore and a clamping element that interacts with the nut and has an opening. The nut has a conical supporting region on the outside. In the mounted state, the nut engages at least partly in the opening of the clamping element and rests on a complimentary inner cone which the clamping element has. The nut has at least one slot which interrupts the nut wall over a sub region of the axial extent of the latter. The at least one slot opens at the axial end of the nut which is located closer to the larger diameter than to the smaller diameter of the conical supporting region is designated as the top end. The clamping element can be screwed into a mounting element.

Claims

1. A fastening device (1) for fastening at least one mounting element on a threaded bolt (6), comprising a nut (2) with a threaded bore (7), and a clamping element (3) cooperating with the nut (2) and with an opening (8), wherein the nut (2) comprises an outside, conical support area (9) with which it engages in the mounted state at least partially into the opening (8) of the clamping element (3) and rests there on a complementary inner cone (10) comprised by the clamping element (3), and wherein the nut (2) has at least one slot (12) which interrupts the nut wall over a partial area of its axial extension, wherein the at least one slot (12) empties at the axial end of the nut (2) which is closer to the larger diameter than to the smaller diameter of the conical support area (9), and which is designated as the upper end, wherein the at least one slot (12) extends starting from there over a length which is between 20% and 95% of the total axial length of the nut (2), and wherein the clamping element (3) comprises an outer threading (26) at least in a partial area with which it can be screwed into a mounting element.

2. The fastening device (1) according to claim 1, wherein the nut wall, which is located axially behind the at least one slot (12) when viewed from the upper end is constructed continuously over the entire circumference without interruption.

3. The fastening device (1) according to claim 1, wherein the at least one slot (12) runs parallel to the axis or rotation (16) of the nut (2).

4. The fastening device (1) according to claim 1, wherein the circumferential areas of the nut wall which remain in the prolongation of the at least one slot (12) are constructed as a theoretical breaking position which breaks when a predetermined load is exceeded.

5. The fastening device (1) according to claim 1, wherein the nut (2) comprises several slots (12), which are uniformly distributed along the circumference.

6. The fastening device (1) according to claim 1, wherein the slotted area on the upper end of the nut (2) can be inwardly compressed during the penetration of the conical support area (9) into the inner cone (10) of the clamping element (3) so that the radial and the axial threading play between the nut (2) and a threaded bolt (6) which can be screwed into the nut (2) are reduced.

7. The fastening device (1) according to claim 1, wherein a head area (11) with a multi-edge circumferential profile follows the upper end of the conical support area (9) of the nut (9).

8. The fastening device (1) according to claim 1, wherein at least one of the contact surfaces of the conical pairing (9, 10) between the nut (2) and the clamping element (3) is provided with a friction-reducing coating.

9. The fastening device (1) according to claim 1, wherein the clamping element (3) comprises a radially outwardly projecting collar (18) which forms an axial stop surface (19).

10. The fastening device (1) according to claim 9, wherein the outer threading (26) of the clamping element (3) is introduced into the circumferential surface of the collar (18).

11. The fastening device (1) according to claim 1, wherein it comprises a second nut (5) which can be screwed onto the outer threading (26) of the clamping element (3) and which forms an axial stop surface on at least one of its front surfaces.

12. The fastening device (1) according to claim 1, wherein it forms an anchor head (21) or at least a part of an anchor head (21) for anchoring a traction anchor (22).

13. The fastening device (1) according to claim 1, wherein it comprises two nuts (2) and two clamping elements (3) which cooperate in pairs, and that it comprises tubular mounting element (4) which has two inner threaded areas (27) into which one of the two clamping elements (3) can be screwed.

14. The fastening device (1) according to claim 13, wherein a threaded bolt (6) is screwed into each nut (2) and that the two clamping elements (3) are screwed into the mounting element (4) so that the two threaded bolts (6) are connected to one another by the two nuts (2), the two clamping elements (3) and by the coupling element (4).

15. The The fastening device (1) according to claim 5 wherein the nut (2) comprises 2 to 6 slots.

Description

[0033] Other advantages and features of the invention result from the following description and the exemplary embodiments shown in the drawings. In the drawings:

[0034] FIG. 1 shows a cross section through a first embodiment of a fastening device according to the invention;

[0035] FIG. 2 shows a cross section through a second embodiment of a fastening device according to the invention;

[0036] FIG. 3 shows a cross section through an arrangement of the invention with two fastening devices according to FIG. 1;

[0037] FIG. 4 shows a view of an embodiment of a fastening device corresponding to FIG. 2;

[0038] FIG. 5 shows the fastening device from FIG. 4 on a traction anchor in a set state;

[0039] FIG. 6 shows a cross section through a third embodiment of a fastening device according to the invention; and

[0040] FIG. 7 shows a view of a fastening device according to FIG. 6.

[0041] The exemplary embodiments of fastening devices 1 according to the invention and shown in the figures each comprise a nut 2 and an associated clamping element 3 as essential components. Each fastening device 1 serves to fasten one or more other mounting elements, for example a tubular casing 4 or a second nut 5, on a threaded bolt 6. To this end the nut 2 has a threaded bore 7 and the clamping element 3 has a central through opening 8 through which a threaded bolt 6 can be run.

[0042] The body of the nut 2 has a conical support area 9 which engages in the mounted state into the opening 8 of the clamping element 3. There, the conical support area 9 of the nut 2 lies on a complementary inner cone 10 which the clamping element 3 has as a circumferential wall of the opening 8. The conical support area 9 and also the inner cone 10 are constructed to be self-locking here with a conical angle of 7.5.

[0043] A head area 11 of the nut 2 for applying a torque for a desired clamping with an outer hexagon follows the upper end of the conical support area 9, which has the greater diameter in comparison to the lower end.

[0044] In order to increase the carrying capacity and to achieve higher strength values, the nut 2 has two diametrically opposed slots 12 running in an axially parallel manner which interrupt the nut wall over the length of its axial extension. According to the invention these slots 12 are arranged in such a manner that they begin on the upper end 13 of the nut 2 and end at a distinct distance 14 from the lower end 15 of the nut 2. In the exemplary embodiments of FIGS. 1, 2 and 3 the slots 12 extend starting from the upper end 13 over a length that is between 80% and 85% of the entire axial length of the nut 2. In the exemplary embodiment in FIG. 6 the slots 12 extend over a length of approximately 90% of the total axial length of the nut 2.

[0045] The two slots 12 separate the head area 11 and the predominant part of the conical support area 9 into two segments Ila and 1 lb. Only the lower end of the conical support area 9 with a smaller diameter is constructed at a height 14 of circa 15% to 20% of the axial length of nut 2 continuously over the entire circumference.

[0046] In the direction of the longitudinal axis 16 the nut 2 is provided with a continuous threaded bore 7 whose inner threading is adapted to the threading 17 of the threaded bolt 6. Therefore, the nut 2 can readily be screwed at first on to the threaded bolt 6 with a slight play, in contrast to which the inner threading of the nut 2 is fixed without play and slippage on the threading 17 of the threaded bolt 6 with a radial pressing or clamping of the conical support area 9 in the inner cone 10.

[0047] In FIGS. 2, 4 and 5 the clamping element 3 comprises on its upper end a radially outwardly projecting collar 18 which forms an axial stop surface 19 on its bottom front side. The stop surface 19 can be supported, for example, on an anchor plate 20 if the fastening device for an anchor head 21 of a traction anchor 22 is used (FIG. 5).

[0048] Even the head area 11 of the nut 2 has a stop surface 23 running vertically to the longitudinal axis 16 on its lower front surface. This stop surface 23 can strike against a complementary stop surface 24 formed on the upper side of the clamping element 3. This positive locking then prevents a further drawing in of the conical support range 9 of the nut 2 into the inner cone 10 of the clamping element 3.

[0049] The arrangement 25 according to the invention and shown in FIG. 3 comprises two identical fastening devices 1 from FIG. 1. They are screwed with the outer threading 26 of the clamping element 3 into one of two inner threadings 27 which comprises a tubular mounting element 4 on both its ends. In this manner two coaxial threaded bolts 6 which are screwed into a nut 2 of a fastening device Tare connected to one another in a very firm manner by the tubular mounting element 4 forming a coupling element. In the exemplary embodiment shown the two nuts 2 and the two clamping elements 3 as well as the tubular mounting element 4 consist of steel, in contrast to which the two threaded bolts 6 preferably consist of glass fiber-reinforced plastic (GFK).

[0050] In the exemplary embodiment shown in the FIGS. 6 and 7 a second nut 5 which is designated as the outer nut is screwed onto the outer threading 26 of the clamping element 3. It rests with its bottom front surface, which forms an axial stop surface, on a plate-shaped mounting element, for example on an anchor plate 20. After the very firm connection of the fastening device 1 has been established with the threaded bolt 6 or traction anchor 22, additional clamping can be applied in this embodiment by subsequently tightening the outer nut 5, which allows, for example, a simple readjustment in the case of setting phenomena, for example in the case of a traction anchor 22.