Fastener and Fastening Arrangement Including Nut with Load Transfer Shoulder

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.

Claims

1.-15. (canceled)

16. A fastener, comprising: an anchor bolt (30); and a nut (40); wherein the nut (40) has a nut hole (41) and an internal thread (64) projecting into the nut hole (41); wherein the anchor bolt (30) has an anchor portion (31) and a threaded rod (37) that has an external thread (63) and that is connected to the anchor portion (31) to transfer a tensile force into the anchor portion (31); wherein the nut (40) is arranged on the threaded rod (37) and the internal thread (64) of the nut (40) threadedly engages the external thread (63) of the threaded rod (37); wherein the nut (40) comprises a rearward nut section (43), a forward nut section (45) which is located closer to the anchor portion (31) of the anchor bolt (30) than the rearward nut section (43), and an outside shoulder (44) for load transfer into the nut (40) which is located between the forward nut section (45) and the rearward nut section (43) and which faces the anchor portion (31) of the anchor bolt (30); wherein the internal thread (64) of the nut (40) extends at least in the forward nut section (45) and the internal thread (64) of the nut (40) threadedly engages the external thread (63) of the threaded rod (37) at least in the forward nut section (45).

17. The fastener according to claim 16, wherein the forward nut section (45) is less rigid than the rearward nut section (43).

18. The fastener according to claim 16, wherein the forward nut section (45) has at least in a region a smaller wall thickness and/or a smaller outer diameter than the rearward nut section (43).

19. The fastener according to claim 16, wherein the forward nut section (45) and the rearward nut section (43) both adjoin the outside shoulder (44).

20. The fastener according to claim 16, wherein the forward nut section (45) defines at least one slot (47) that extends from a free end of the forward nut section (45) towards the outside shoulder (44).

21. The fastener according to claim 20, wherein the at least one slot (47) terminates at a distance from the outside shoulder (44).

22. The fastener according to claim 16, wherein the nut hole (41) extends through the forward nut section (45) and through the rearward nut section (43).

23. The fastener according to claim 16, wherein the internal thread (64) of the nut (40) extends in the forward nut section (45) and in the rearward nut section (43) and the internal thread (64) of the nut (40) threadedly engages the external thread (63) of the threaded rod (37) both in the forward nut section (45) and in the rearward nut section (43).

24. The fastener according to claim 16, wherein the outside shoulder (44) is ring-shaped.

25. The fastener according to claim 16, wherein the rearward nut section (43) has a plurality of spanner flats (49).

26. The fastener according to claim 16, wherein a lateral surface of the forward nut section (45) is cylindrical with an annular base, wherein the nut hole (41) has a constant diameter both in the forward nut section (45) and in the rearward nut section (43), and wherein the diameter of the nut hole (41) in the forward nut section (45) and in the rearward nut section (43) is the same.

27. The fastener according to claim 16, wherein the anchor bolt (30) is a wedge anchor.

28. A fastening arrangement, comprising: a substrate (10) having a substrate hole (11); an attachment part (20) having an attachment part hole (21); and the fastener according to claim 16; wherein the anchor bolt (30) extends in the substrate hole (11) and in the attachment part hole (21); wherein the anchor portion (31) of the anchor bolt (30) is anchored at the substrate (10); wherein the outside shoulder (44) of the nut (40) rests against the attachment part (20).

29. The fastening arrangement according to claim 28, further comprising at least one spherical washer (50) which is located between the nut (40) and the attachment part (20) and which surrounds the anchor bolt (30), wherein the outside shoulder (44) rests against the attachment part (20) via the at least one spherical washer (50).

30. The fastening arrangement according to claim 28, wherein the forward nut section (45) and the attachment part hole (21) are axially offset.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0036] FIG. 1 is a partial sectional view of an embodiment of a fastening arrangement including a fastener;

[0037] FIG. 2 is a perspective view of the nut of the fastener of FIG. 1; and

[0038] FIG. 3 is partial sectional view of a modified embodiment of a fastening arrangement including a fastener.

DETAILED DESCRIPTION OF THE DRAWINGS

[0039] An example of a fastening arrangement including a fastener is shown in FIGS. 1 and 2. The fastening arrangement comprises a substrate 10, preferably a concrete substrate or a masonry substrate, an attachment part 20, in particular a metal attachment part, for example a support foot or a bracket, resting against the substrate 10, and the fastener, securing the attachment part 20 to the substrate 10.

[0040] The substrate 10 has a substrate hole 11, which is a blind hole in the present case, but which could also be through hole. The attachment part 20 has an attachment part hole 21, which is a through hole and which overlaps the substrate hole 11.

[0041] The fastener comprises an anchor bolt 30 that is located in the substrate hole 11 and in the attachment part hole 21. The anchor bolt 30 comprises an anchor portion 31, which is anchored at the substrate 10, in particular within the substrate hole 11. The anchor bolt 30 also comprises a threaded rod 37, which is connected to the anchor portion 31 so as to transfer tensile force from the threaded rod 37 to the anchor portion 31. The threaded rod 37 is provided with an external thread 63, which spirals around the threaded rod 37. In the present embodiment, the anchor bolt 30 is an expansion anchor. Thus, the anchor portion 31 comprises at least one wedge part 5, which is an expansion cone in the shown embodiment, and at least one expandable part 6, which is an expansion sleeve in the shown embodiment. The wedge part 5 radially loads the expandable part 6 when the wedge part 5 is axially loaded, thereby anchoring the anchor portion 31. However, the anchor bolt 30 being an expansion anchor is an example only. The anchor bolt 30 could, for example, also be a chemical anchor.

[0042] The fastener furthermore comprises a nut 40 with an axially extending nut hole 41 extending through the nut 40. The nut 40 has an internal thread 64, which projects into the nut hole 41, and which corresponds to the external thread 63 of the threaded rod 37. The threaded rod 37 is arranged in the nut hole 41, and the internal thread 64 of the nut 40 threadedly engages the external thread 63 of the threaded rod 37. The nut 40 axially abuts against the attachment part 20, in particular via a washer 50, thereby positive-locking the attachment part 20 to the anchor bolt 30 and securing the attachment part 20 on the substrate 10.

[0043] The nut 40 comprises two sections, namely a rearward nut section 43 and a forward nut section 45, wherein the rearward nut section 43 and the forward nut section 45 are axially offset. The rearward nut section 43 has larger outer diameter than the forward nut section 45, and a forwardly facing, outside shoulder 44 is formed between the forward nut section 45 and the rearward nut section 43. The outside shoulder 44 delimits the forward nut section 45 at its rearward end and the rearward nut section 43 at its forward end. The outside shoulder 44 is ring-shaped and faces forwards, i.e., it faces the anchor portion 31. Preferably, at least parts of the outside shoulder 44 extend in transverse plane of the anchor bolt 30.

[0044] The rearward nut section 43 has six spanner flats 49, forming a hexagonal cylinder on the lateral surface of the rearward nut section 43. The lateral surface of the forward nut section 45 essentially has the shape of a circular cylinder. However, the lateral surface of the forward nut section 45 could also have other shapes, such as a truncated conical shape.

[0045] The nut hole 41 extends, in particular with constant diameter, through both the forward nut section 45 and the rearward nut section 43. The internal thread 64 also extends along both the forward nut section 45 and the rearward nut section 43.

[0046] Slots 47 are provided in the forward nut section 45, which originate at the free, forward end of the forward nut section 45, which extend towards the rearward nut section 43 and towards the outside shoulder 44, and which terminate at a distance from the outside shoulder 44. These slots 47, which connect the outside lateral surface of the forward nut section 45 with the nut hole 41, reduce the rigidity of the forward nut section 45.

[0047] Abutment of the nut 40 against the attachment part 20 (via washer 50) takes place at the outside shoulder 44, and not at the forwards free end of the nut 40. Thus, tension is transferred to the nut 40 remote from the forwards free end of the nut 40, which can equalize load transfer and avoid load peaks at the threads 63, 64.

[0048] As already mentioned, the fastener comprises a washer 50 surrounding the threaded rod 37 at an axial position between the anchor portion 31 and the nut 40. In the shown fastening arrangement, the nut 40 thus abuts against the attachment part 20 via the washer 50. By way of example, the shown washer 50 is a spherical washer having a convex levelling surface facing the attachment part 20. This provides a levelling function in case of slight misalignment. However, the washer 50 is optional. In particular, it can also be envisaged that the nut 40 directly abuts against the attachment part 20.

[0049] FIG. 3 shows a modification of the embodiment shown in FIGS. 1 and 2. In the embodiment of FIG. 3, the forward nut section 45 extends merely into the washer 50, but not into the attachment part 20. In other words, the forward nut section 45 and the attachment part hole 21 are axially offset, which can be useful in order to avoid unwanted load bypass between the forward nut section 45 and the attachment part 20. Apart from that, the embodiment of FIGS. 1 and 2 and that of FIG. 3 are the same, and reference is therefore made to the description of the embodiment of FIGS. 1 and 2, which applies mutatis mutandis to that of FIG. 3.