COMBINATION OF ANCHOR RAIL AND HAMMER HEAD ELEMENT

Abstract

A combination of an anchor rail with a hammer head element for setting in concrete. In order to achieve the best possible load-carrying capacity in the longitudinal direction L of the anchor rail, the anchor rail has toothing, specifically in a region close to a slot-like opening for the insertion of the hammer head element. The hammer head element, in a force-free state, rests only on the toothing and comes to rest over an entire head upper side only in the case of increased tensile forces, as a result of which the force transmission moves outwards to side walls of the anchor rail. This facilitates the load-carrying capacity of the anchor rail with respect to tensile forces.

Claims

1-11. (canceled)

12. A combination of an anchor rail, in particular for setting in concrete, with a hammer head element, wherein the anchor rail has a rail which has a cross-section with a substantially uniform, c-shaped profile which extends along a longitudinal direction, wherein the profile has an inner side and an outer side and a, in particular substantially rectangular contour with a lower side, an upper side opposite the lower side, and two connecting sides which connect the upper side and the lower side, wherein an opening of the C-shaped profile extends on the upper side in the longitudinal direction, wherein in particular at least two anchor bolts are arranged on the lower side of the rail, wherein the connecting sides are formed by side walls of the rail, wherein lips each extend on the upper side with a projection from the respective side wall to the opening, and wherein the hammer head element has a hammer head which can be inserted into the opening in a first orientation and can be brought into contact on the inner side of the lips with an upper side facing the lips in a second orientation, wherein the hammer head can be brought into contact with the inner side in a region of the lips facing the opening in an inserted, force-free state in which the hammer head does not cause a force-related deformation of the lips, while in a region of the lips facing the side walls, there is a distance between the respective lip and the head upper side, wherein the lips have a toothing on the inner side in a region facing the opening and no toothing in a region facing the side walls, and wherein the hammer head has teeth and, in the inserted, force-free state, the hammer head and the lips can be brought into contact exclusively with the teeth and the toothings, wherein, in addition to the region of the lips facing the opening, the hammer head, in a loaded state in which a service load acts on the hammer head, can be brought into contact in the region of the lips facing the side walls with the hammer head causing deformation of the lips.

13. The combination according to claim 12, wherein the region of the lips facing the side walls in which the hammer head has a distance in the inserted, force-free state, extends in the direction towards the opening up to a limit which corresponds at least to 0.25 times, in particular at least 0.4 times, the projection of the lip.

14. The combination according to claim 12, wherein the maximum distance between the respective lip and the head upper side at both lips corresponds to 1% to 30% of the respective projection of the lip in the inserted, force-free state, wherein the distance is measured perpendicular to the extension of the upper side.

15. The combination according to claim 12, wherein the maximum distance between the respective lip and the head upper side at both lips in the inserted, force-frees state corresponds in each case to a maximum of 60% of the difference between the maximum thickness and the minimum thickness of the lip, wherein the distance is measured perpendicular to the extension of the upper side.

16. The combination according to claim 12, wherein the maximum distance between the respective lip and the head upper side at both lips in the inserted, force-free state is always between 0.1 mm and 1.5 mm, in particular between 0.2 mm and 1.0 mm, wherein the distance is measured perpendicular to the extension of the upper side.

17. The combination according to claim 12, wherein the thickness of the lip always widens in the direction towards the opening.

18. The combination according to claim 12, wherein the ratio of the minimum thickness of the lip to the maximum thickness of the lip is between 0.4 and 0.8, in particular between 0.5 and 0.75.

19. The combination according to claim 12, wherein the maximum thickness of the lip corresponds to at least to 0.5 times, in particular at least to 0.6 times the projection of the lip.

Description

[0025] In the drawings:

[0026] FIG. 1 shows a combination according to the invention of an anchor rail with a hammer head screw in a sectional view; and

[0027] FIG. 2 shows an enlarged sectional view of the same combination in the region of the contact between the head upper side of the hammer head screw on a lip of the anchor rail.

[0028] The exemplary embodiment shown in FIGS. 1 and 2 shows a cross-section through an anchor rail 1 according to the invention. The anchor rail 1 has a rail 2 with a C-shaped profile which extends along a longitudinal direction L, wherein the longitudinal direction L runs perpendicular to the plane of the drawing in all the figures. The profile of the rail 2 has an inner side 3 and an outer side 4 and a substantially rectangular outline with rounded corners. The outline also has a lower side 5 and an upper side 6 opposite the lower side 5 which are connected on both sides by connecting sides 7. The lower and upper sides 5, 6 are approximately 1.5 times as long as the connecting sides 7.

[0029] Multiple anchor bolts 8 in the form of headbolts are arranged on the lower side 5. Since the anchor bolts 8 are arranged one behind the other in the longitudinal direction L, only one of the anchor bolts 8 is visible. The anchor bolt 8 is also only partially shown, since it is not important in the following. A slot-like opening 9 of the C-shaped profile extends along the upper side 6 in the longitudinal direction L. The connecting sides 7 are formed by side walls 10. Lips 11 extend from the side walls 10 to the opening 9 in each case on the upper side 6. In the region of the openings 9, the inner side 3 transitions by end faces 12 of the lips 11 into the outer side 4.

[0030] The thickness DL of the lips 11 increases in each case in the direction toward the opening 9. The thickness DL of the lips 11 therefore does not increase by a constant amount. The thickness DL of the lips 11 is always measured perpendicular to the extension of the upper side 6. The extension means the extension along the direction from the connection side 7 to the opening 9.

[0031] In the following, one of the two lips 11 is described, wherein the other lip 11 is mirror-symmetrical in the exemplary embodiment like the entire anchor rail 1. On the inner side 3, the side wall 10 transitions by a radius into the lip 11. The thickness DS of the side wall 10 is constant and accordingly also corresponds to a minimum thickness DSmin of the side wall 10. Starting from the side wall 10, the inner side 3 passes the narrowest point of the lip 11, that is to say the location with a minimum thickness DLmin of the lip 11, and then runs at an angle of approximately 50 to the upper side 6 up to an inverted radius at which the lip 11 assumes a maximum thickness DLmax. The maximum thickness DLmax of the lip 11 corresponds approximately to 2.0 times the thickness DS of the sidewall 10, and the minimum thickness DLmin corresponds approximately to 0.5 times the maximum thickness DLmax of the lip 11.

[0032] Starting from the location of the maximum thickness DLmax, the inner side 3 extends with a rounding 12 and an average angle of approximately 15 to the upper side 6 to an end face 13 of the lip 11 which extends flat and perpendicular to the upper side 6. The end faces 13 define a projection K of the lip 11 from the side wall 10 to the opening 9, which can also be regarded as an extension of the lip 11. The ratio of the maximum thickness DLmax of the lip 11 to the projection K is approximately 0.7. The upper side 6 is not completely flat but has a production-related groove 14 running in the longitudinal direction L.

[0033] In the region of the rounding 12, the lip 11 has a toothing 15 extending in the longitudinal direction L. Tooth tips 16 extend perpendicular to the longitudinal direction L and form the rounding 12, while a respective tooth base 17 is straight and runs at an angle of approximately 15 to the upper side 6. The previously described thickness DL of the lip 11 relates to the envelope contour of the toothing 15, that is to say to the tooth tips 16 and not to the contour in the tooth base 17, and emerges from a flat upper side 6, and accordingly does not take into account the groove 14.

[0034] The rail 2 is formed from a flat sheet metal strip in a multi-step rolling bending method (not shown). The lips 11 are thickened in particular by lateral rollers which act on the end faces of the sheet metal strip.

[0035] A hammer head screw 18 is inserted into the rail 2 as a hammer head element 19. For this purpose, a hammer head 20 of the hammer head screw 18 was aligned along the opening 9, i.e., in the longitudinal direction L of the rail 2. The hammer head 20 was then rotated by 90 into the shown position. For better clarity, only part of a thread 21 of the hammer head screw 18 is shown. An element to be fastened can be connected via the thread 21 (not shown) by means of a nut and a washer. The tightening of the nut causes the hammer head 20 to be pulled against the inner side 3 of the rail 2 in the region of the lip 11. The hammer head 20 has a geometry corresponding to the lip 11 on its head upper side 22 facing the lip 11. Starting from a transition region 23 in which the thread 21 transitions over a cylindrical portion 24 into the hammer head 20, a toothing 25 extends on both sides on the head upper side 22, the flank geometry of which corresponds to the flank geometry of the toothing 15 in such a way that the toothing 15 rests substantially against the entire surface of the toothing 25. For this purpose, the flanks of the toothing 25 fall to the side from the transition region 23 at an angle of approximately 75 to a longitudinal axis H of the hammer head screw 18, wherein to the side means the direction away from the longitudinal axis H of the hammer head screw 18. Continuing to the side, the toothing 25 is adjoined by a contour which in turn corresponds with the lip 11, and thereby forms an elevation 26. However, the elevation 26 does not lie on the lip 11 but forms a gap 27. In other words, there is a distance A between the respective lip 11 and the head upper side 22. The distance A is measured perpendicular to the upper side 6 substantially over the entire gap 27 and forms a maximum distance Amax. Starting from the elevation 26, the hammer head 20 terminates laterally with a flat side surface 28 which is parallel to the longitudinal axis H of the hammer head screw 18.

[0036] The cylindrical section 24 has a diameter which corresponds to more than 80%, in the exemplary embodiment approximately 88%, of the width of the opening 9.

[0037] The illustrated state is an inserted, force-free state within the meaning of the invention, that is to say, the hammer head element 19 is inserted into the rail 2 and rests against the lips 11 with at most slight force, wherein no significant deformation occurs. This includes that the hammer head screw 18 is fixed to a nut (not shown) that is screwed against the upper side 6. The hammer head 20 rests with its toothing 25 on the inner side 3 in a region of the lips 11 facing the opening 9, while in a region of the lips 11 facing the side walls 10, there is the distance A between the respective lip 11 and the upper side 22 from the gap 27. The region with distance A extends up to a limit 29. A distance DG from the side wall 10 to the limit 29, measured parallel to the upper side 6, corresponds approximately to half the projection K of the lip 11. The maximum distance Amax is approximately 0.6 mm and accordingly corresponds approximately to 7% of the projection K and approximately a quarter of the difference between the maximum thickness DLmax and the minimum thickness DLm in of the lip 11.

[0038] The anchor rail 1 is intended to be set in a base made of concrete (not shown) in such a way that the upper side 6 terminates with the concrete surface, and the opening 9 is accessible for inserting the hammer head element 17. For example, a substructure for a facade can be fastened thereto.

[0039] For example, due to the intrinsic weight and wind suction forces acting on a facade, tensile forces, i.e., forces along the longitudinal axis H of the hammer head bolt 18, and transverse forces, i.e., forces perpendicular to the tensile forces, are transmitted from the hammer head element 19 to the anchor channel 1 as a service load. The transverse forces which act parallel to the longitudinal direction L of the rail 2 can thereby be transmitted very effectively by the teeth 25 and the toothing 15. Due to the fact that the hammer head 20 only rests against the lip 11 in this region, the form-fit can act particularly effectively. Should high tensile forces act as a service load, a loaded state is established within the meaning of the invention. Accordingly, a tensile force causes an upward deformation of the lips 11 in the figures, which can also be understood as bending the lips 11 (not shown). As a result, in addition to the toothing 15, the region in which the gap 27 was previously present comes into contact, i.e., a region of the lips 11 facing the side walls 10. As a result of the additional contact, the force is introduced into the lip 11 further in the direction of the side walls 10 which can also be understood as less centrally or lateral. This reduces the effective leverage with which the lip 11 is bent open, accordingly counteracting further deformation and failure.

LIST OF REFERENCE SIGNS

Combination of Anchor Rail and Hammer Head Element

[0040] 1 Anchor rail [0041] 2 Rail [0042] 3 Inner side [0043] 4 Outer side [0044] Lower side [0045] 6 Upper side [0046] 7 Connection side [0047] 8 Anchor bolt [0048] 9 Opening [0049] 10 Sidewall [0050] 11 Lip [0051] 12 Rounding [0052] 13 End face of lip 11 [0053] 14 Groove [0054] Toothing [0055] 16 Tooth tip [0056] 17 Tooth base [0057] 18 Hammer head screw [0058] 19 Hammer head element [0059] 20 Hammer head [0060] 21 Thread [0061] 22 Head upper side [0062] 23 Transition region [0063] 24 Cylindrical section [0064] Teeth [0065] 26 Elevation [0066] 27 Gap [0067] 28 Side surface [0068] 29 Limit [0069] A Distance between lip 11 and head upper side 22 [0070] Amax Maximum distance between lip 11 and head upper side 22 [0071] DG Distance from side wall 10 to limit 29 [0072] DL Thickness of the lip 11 [0073] DLmax Maximum thickness of the lip 11 [0074] DLmin Minimum thickness of the lip 11 [0075] DS Thickness of the side wall 10 [0076] DSmin Minimum thickness of the side wall 10 [0077] H Longitudinal axis of the hammer head screw 18 [0078] K Projection of the lip 11 [0079] L Longitudinal direction of the rail 2