Fastening device, mounting unit and method for mounting a hammer head screw to an anchor channel

Description

[0001] The present invention relates to a fastening device for an anchor rail with a hammer head screw and a holding plate fixed to the hammer head screw with a plurality of teeth for engagement with a toothing on the anchor rail, and an opening through which a threaded bolt of the hammer head screw is passed, wherein at least one locking web (25) projecting into the opening of the holding plate is provided on the holding plate, by means of which locking web the holding plate can be locked to the threaded bolt of the hammer head screw, wherein the at least one locking web is formed integrally with a plate-shaped locking element with an opening for the threaded bolt of the hammer head screw to pass through, a mounting unit and a method for mounting a hammer head screw on an anchor rail.

[0002] DE 10 2009 032 032 A1 discloses a hammer-head bolt for mounting on an anchor rail, in which a plate-shaped toothed part is placed onto the hammer-head bolt, which engages with the teeth of an anchor rail. The toothed part has a through-hole into which the screw shaft is inserted, in order to then mount the hammer-head bolt with the toothed part on the anchor rail. To pre-fix the hammer-head bolt to the anchor rail, a strip made of an elastic foam material can be arranged in the anchor rail so that the head of the hammer-head bolt is pressed against the inwardly projecting webs on the anchor rail. If the elastic strip is removed from the anchor rail, however, the hammer-head bolt with the toothed part can sink into the anchor rail and then fall down, which makes installation more difficult, especially if the toothed part and hammer-head bolt separate from each other again.

[0003] CN 202 466 908 U discloses a fastening device with an anchor rail to which an anchor head screw with a profile on a screw head can be fixed. A threaded portion of the hammer head screw is guided through a locking device.

[0004] Further fastening devices are shown in DE 20 2007 019 242 U1, DE 197 05 709 A1 and CN 108 086 484 A.

[0005] It is therefore an object of the present invention to provide a fastening device for an anchor rail and a method for mounting a hammer head screw on an anchor rail, which avoid the above-mentioned problems and enable effective mounting on the anchor rail.

[0006] This object is achieved with a fastening device having the features of claim 1 and a method of claim 10.

[0007] The fastening device according to the invention comprises a hammer-head bolt and a retaining plate fixed to the hammer-head bolt, said retaining plate having a plurality of teeth for engagement with a toothing on an anchor rail and an opening through which a threaded bolt of the hammer-head bolt passes. At least one locking web is provided, projecting into the opening of the retaining plate, by means of which the retaining plate can be locked to the threaded bolt of the hammer-head bolt. The retaining plate and hammer-head bolt thus form a lockable unit that can be more easily mounted on an anchor rail. The locking web utilizes the profile of the threaded bolt through the formation of the individual threads to create a locking connection between the retaining plate and the hammer-head bolt.

[0008] Preferably, several locking bars are provided at the opening of the retaining plate, distributed around the circumference. For example, three to five locking bars can be used to lock the retaining plate to the threaded bolt.

[0009] The locking bars are integrally formed with a plate-shaped locking element with an opening for the threaded bolt to pass through. The locking element is glued or welded to the retaining plate, particularly on the side of the retaining plate facing away from the head of the hammer-head bolt. This allows the retaining plate and locking element to be mounted as a single unit.

[0010] The retaining plate is preferably at least twice as thick as the plate-shaped locking element, in particular four or eight times as thick. While the locking element can be very thin, particularly so that the locking webs are resilient and have a certain degree of flexibility, forces from the anchor rail are to be transmitted via the retaining plate, so it is significantly thicker. The locking element can be made, for example, from a thin sheet or a plastic plate. The retaining plate can be made from a thicker sheet.

[0011] The retaining plate preferably has teeth on opposite sides which are at least partially covered by a projection. This allows the retaining plate to be placed on the anchor rail so that the teeth engage with the toothing on the anchor rail, wherein movement of the retaining plate in the axial direction of the threaded bolt is limited by the projection. The projection can be formed integrally with the locking element so that positioning on the anchor rail can be achieved via the locking element. The projection can be designed as a bendable web which is optionally inclined to the plane of the plate-shaped locking element, for example at an angle of between 2° and 20°.This allows the projection to be slightly bent during installation on the anchor channel by pressing in the hammer-head bolt, so that after turning the hammer-head bolt, a section of the anchor channel is clamped between the projection and the head of the hammer-head bolt. This provides pre-fixation to the anchor channel and reliably prevents the hammer-head bolt and retaining plate assembly from falling off.

[0012] The retaining plate is preferably thinner than a sheet of the anchor rail on which the toothing is formed. This ensures that a component is clamped to the anchor rail and that the retaining plate does not interfere with this clamping.

[0013] In the method according to the invention, a retaining plate with multiple teeth for engagement with a toothing on an anchor rail is first placed onto a threaded bolt of a hammer-head bolt and then pushed linearly onto the threaded bolt, with at least one locking web being guided in a locking manner on the threaded bolt. The locking web has a certain elasticity in order to lock onto the individual threads, but can be pushed linearly onto the threaded bolt by applying a certain amount of pressure. This eliminates the need to unscrew the retaining plate, which would be necessary if the retaining plate had an internal thread. The unit comprising hammer-head bolt and retaining plate is then placed onto an anchor rail, with the teeth of the holder engaging with the toothing so that the hammer-head bolt can then be turned before a component is fixed to the threaded bolt of the hammer-head bolt.

[0014] The invention will be explained in more detail below using an exemplary embodiment with reference to the accompanying drawings. Figures 1A to 1C show several views of a fastening device according to the invention in the mounted position on an anchor rail; Figures 2A and 2B show two views of the holding plate of the fastening device of the Figure 1 , and Figures 3A and 3B show two views of the hammer head screw with the retaining plate.

[0015] An anchor rail 1 is strip-shaped and comprises a plurality of anchor webs 2, which are integrally formed with a first rail part 3a and a second rail part 3b. The two rail parts 3a and 3b are connected to one another via connecting webs 4 and have a toothing 5 on the side facing one another, spaced from the connecting webs 4. A cavity is formed between the toothing 5 and the connecting webs 4 for mounting hammer-head screws 10. The anchor rail 1 can be designed as described in detail in DE 10 2019 106 155, to which reference is hereby made.

[0016] A fastening device for fixing to the anchor rail 1 comprises a hammer-head bolt 10 having a substantially cuboid-shaped head 11 and a threaded bolt 12. In the mounted position, the head 11 of the hammer-head bolt 10 engages behind the strip-shaped webs on the rail parts 3a and 3b, each of which has a toothing 5 with a plurality of teeth. In order to fix the hammer-head bolt 10 in the longitudinal direction of the anchor rail 1, a holding plate 20 is provided, which is slipped onto the threaded bolt 12 of the hammer-head bolt 10. The holding plate 20 comprises a plurality of teeth 27 on two opposite sides, which engage with the toothing 5 on the anchor rail 1. Furthermore, a plate-shaped locking element 22 is fixed to the holding plate 20 and comprises projections 24 that rest on the webs with the toothing 5.This prevents the retaining plate 20 from entering the cavity between the connecting web 4 and the toothing 5 and prevents the teeth 27 from remaining in engagement with the toothing 5. The projections 24 are formed on opposite sides of the locking element 22.

[0017] The locking element 22 can be glued or welded to the retaining plate 20. Furthermore, the retaining plate 20 comprises inwardly projecting locking webs 25 that can be locked onto the threads of the threaded bolt 12. This pre-fixes the hammer-head bolt 10 to the anchor rail 1 via the retaining plate 20 and the locking element 22.

[0018] In the Figures 2A and 2BThe retaining plate 20 with the plate-shaped locking element 22 is shown in detail. It can be seen that the plate-shaped locking element 22 is significantly thinner than the retaining plate 20; for example, the thickness of the plate-shaped locking element 22 is only between 5% and 25% of the thickness of the retaining plate 20. The locking element 22 can be made of a thin sheet metal and welded to the retaining plate 20. If the locking element 22 is made of plastic, it can also be glued.

[0019] As in Figure 2AAs shown, the projections 24 are aligned at an angle to the plane formed by the plate-shaped locking element 22, for example at an angle between 2° and 20°, in particular between 5° and 15°. This allows the projections 24 to be bent during assembly of the hammer-head screw 10, so that in the assembled position, a head 11 of the hammer-head screw 10 rests against the webs of the anchor rail 1 via the projections 24 and is thus pre-fixed.

[0020] The holding plate 20 comprises a cylindrical opening 21, and the locking element 22 comprises an opening 23 which is substantially congruent with the opening 21, wherein a plurality of locking webs 25 project into the opening 23 on the locking element 22, distributed over the circumference. The distance from a tip of the locking webs 25 to a center of the opening 23 is thus less than the radius of the opening 23. The locking webs 25 are designed to be bendable and are arranged laterally spaced from the locking element 22 via slots 26, wherein the locking webs 25 are integrally connected to the locking element 22 in the longitudinal direction. In the illustrated embodiment, four locking webs 25 are provided, although the number of locking webs 25 can also be varied.

[0021] In the Figures 3A and 3BThe fastening device with the hammer-head screw 10 and the retaining plate 20 is shown. To produce this assembly unit, the retaining plate 20 with the locking element 22 is first positioned at a tip of the threaded bolt 12 and then pushed linearly onto the threaded bolt, wherein the locking webs 25 are guided in a locking manner along the threaded bolt, i.e., can be locked onto the individual threads, depending on how far the retaining plate 20 is pushed on. The retaining plate 20 is preferably pushed on up to the head 11 or just before it.

[0022] The assembly unit can now be mounted on the anchor channel 1, which is preferably cast in concrete, by inserting the head 11 into the gap between the two toothings 5 ​​and engaging the teeth 27 with the toothing 5. The threaded bolt 12 can then be slightly pressed towards the anchor channel 1, causing the projections 24 to bend, in order to then rotate the head 11 of the hammer head screw 10 so that the head engages behind the two webs with the toothing 5, as shown in Figure 1C is shown. After releasing the hammer head screw 10, the projections 24 press the head 11 against the underside of the webs, so that the assembly unit is clamped to the anchor rail 1.

[0023] In its installed position, i.e., cast in a concrete component, the anchor rail 1 can be aligned horizontally, vertically, or inclined in the longitudinal direction. The fastening device with the hammer-head bolt 10 and the retaining plate 20 ensures pre-fixation for any orientation of the anchor rail 1. The retaining plate 20, in particular the projections 24, reliably prevents the retaining plate 20 from being pushed through the toothing 5 on the anchor rail 1. The length of the anchor rail 1 and the number of fastening devices per anchor rail 1 can be designed by a specialist depending on requirements. List of reference symbols

[0024] 1Anchor rail 2Anchor web 3a, 3bRail part 4Connecting web 5Toothing 10Hammer head screw 11Head 12Threaded bolt 20Retaining plate 21Opening 22Locking element 23Opening 24Projection 25Locking web 26Slot 27Tooth

Claims

1. Securing device for an anchor rail (1) having a T-head bolt (10) and a retaining plate (20) which is fixed to the T-head bolt (10) and has a plurality of teeth (27) for engagement with a toothing (5) on the anchor rail (1), and an opening (21) through which a threaded bolt (12) of the T-head bolt is passed, wherein at least one latching web (25) projecting into the opening (21) of the retaining plate (20) is provided on the retaining plate (20), by means of which the retaining plate (20) can be latched to the threaded bolt (12) of the T-head bolt (10), wherein the at least one latching web (25) is integrally formed with a plate-shaped latching element (22) with an opening (23) for passing through the threaded bolt (12) of the T-head bolt (10), wherein the latching element (22) is glued or welded to the retaining plate (20).

2. Securing device according to claim 1, characterized in that a plurality of latching webs (25) distributed over the circumference are provided at the opening (21) of the retaining plate (20).

3. Securing device according to one of the preceding claims, characterized in that the retaining plate (20) is at least twice as thick, in particular more than four times as thick, as the latching element (22).

4. Securing device according to one of the preceding claims, characterized in that the latching element (22) is made of a thin sheet metal.

5. Securing device according to one of the preceding claims, characterized in that the retaining plate (20) has teeth (27) on opposite sides which are at least partially covered by a projection (24).

6. Securing device according to claim 5, characterized in that the projection (24) is formed integrally with the latching element (22).

7. Securing device according to claim 5 or 6, characterized in that the at least one projection (24) is designed as a bendable web which is oriented in an inclined manner towards the anchor rail (1) with respect to the plane of the latching element.

8. Installation unit having an anchor rail (1) and at least one securing device according to one of the preceding claims which is fixed to the anchor rail (1).

9. Installation unit according to claim 8, characterized in that the retaining plate (20) is of thinner design than a plate of the anchor rail (1) on which the toothing (5) is formed.

10. Method for installing a T-head bolt (10) on an anchor rail (1), comprising the following steps of: - placing a retaining plate (20) having several teeth (27) for engagement with a toothing (5) on an anchor rail (1) on a threaded bolt (12) of the T-head bolt (10); - linearly displacing the retaining plate (20) on the threaded bolt (12), wherein at least one latching web (25) is guided in a latching manner on the thread of the threaded bolt (12), wherein the at least one latching web (25) is integrally formed with a plate-shaped latching element (22) with an opening (23) for passing through the threaded bolt (12) of the T-head bolt (10) and the latching element (22) is glued or welded to the retaining plate; - placing the unit consisting of the T-head bolt (10) and the retaining plate (20) on the anchor rail (1), wherein the teeth (27) of the retaining plate (20) come into engagement with the toothing (5); - turning the T-head bolt (10), and - installing a component on the threaded bolt (12) of the T-head bolt (10).