Anti-rotation device for screw connection unit that can be inserted into a groove of a profile

Abstract

Anti-rotation device (10) for a screw connection unit (12) which can be inserted into a groove of a profile in a way that engages behind it, with a base plate (14) having a continuous first recess (15) with a first internal contour (16) and a projection locking element (18) molded onto the base plate (14), which prevents rotation of the device when an anti-rotation device (10) is inserted into the groove, characterized by an upper plate unit (20) arranged at a distance (A) from the base plate (14), which in the installed state a receiving unit (21) for the positive locking reception of a screw head or a nut, a further continuous recess (23) with a second inner mold contour (24) for receiving a threaded shank, and to which a mold unit (22) with a second outer mold contour (26) is molded, wherein the circumferential cross-sectional dimensions of the first inner contour (16) of the base plate (14) are slightly larger than the circumferential cross-sectional dimensions of the second outer contour (26) of the mold unit (22), so that the mold unit (22) can be inserted into the first recess (15) of the base plate (14) in a form-fitting manner as soon as a The first predetermined breaking point (28) located between the molding unit (22) and the base plate (14) breaks.

Description

TECHNICAL AREA

[0001] The present invention relates to an anti-rotation device for a screw connection unit, which can be inserted into a groove of a profile in a way that engages behind it, comprising a base plate with a continuous first recess with a first internal contour and a projection locking element formed on the upper side of the base plate, which prevents rotation of the device when the anti-rotation device is inserted into the groove.

[0002] Such anti-rotation devices are used, for example, for screw connection units used in the assembly or installation of wall and shower frame components. STATE OF THE ART

[0003] It is common practice to use a T-nut with a screw or a threaded rod with an additional nut to connect bathtub and shower frame components. The T-nut is inserted into a groove in a profile that connects to the bathtub. A bathtub foot is then attached to this screw connection. This connection method has the disadvantage that structure-borne noise is transmitted undamped, as metal is in contact with metal.

[0004] In another type of connection, where, for example, a grooved profile is used, a grooved threaded rod is inserted into a slotted hole, with the threaded rod groove clamped by a nut in the groove. With this connection, the load rests solely on the thread flanks of the grooved threaded rod. This is not optimal in terms of load-bearing capacity or ensuring long-term functionality.

[0005] Furthermore, in known base frames, a threaded rod with a hexagonal nut on both ends is used according to another connection technique. This has the disadvantage that the second nut must be fitted before the profile is mounted, but is no longer accessible after the profiles are installed. This means that when the bathtub base is moved to its final mounting position, the lock nut rotates and the connection can loosen. This can lead to instabilities that can only be corrected with considerable effort.

[0006] Furthermore, the following are known from the prior art: DE 33 09 884 A1, US 5 606 753 A, US 4 906 150 A and CN 2 132 019 Y. PRESENTATION OF THE INVENTION

[0007] Based on the aforementioned prior art, the present invention is based on the objective or technical problem of providing an anti-rotation device of the type mentioned above that ensures high sound decoupling, enables simple and quick assembly, prevents the connection from loosening when fitting into the final assembly position, ensures permanently reliable function and is economically manufacturable.

[0008] The anti-rotation device according to the invention is defined by the features of independent claim 1. Advantageous embodiments and further developments are the subject of claims directly or indirectly dependent on independent claim 1.

[0009] The anti-rotation device according to the invention is characterized by the following features: An upper plate unit arranged at a distance above the base plate, which has on its upper side a receiving unit for the positive-locking reception of a screw head or a nut, which has a further continuous recess with a second inner contour for receiving a threaded shank, and to which a forming unit with a second outer contour is integrally formed on its underside, wherein the circumferential cross-sectional dimensions of the first inner contour of the base plate are slightly larger than the circumferential cross-sectional dimensions of the second outer contour of the forming unit, so that the forming unit can be positively inserted into the first recess of the base plate as soon as a first predetermined breaking point located between the forming unit and the base plate breaks.

[0010] Assembly with the anti-rotation device according to the invention is extremely simple. First, a screw with a screw head and screw shank is inserted from above through the recess in the upper plate and the recess in the base plate. The screw head is then positively locked against rotation in the receiving unit of the upper plate assembly. Next, a nut is screwed onto the screw shank from below. After inserting the screw connection unit with the anti-rotation device into a groove, the nut is screwed against the base plate at the desired assembly position. This causes the first predetermined breaking point to break, and the upper plate assembly is moved towards the base plate, with the forming element of the upper plate assembly being inserted into the continuous recess in the base plate.

[0011] In the assembled state, the engagement area of ​​the groove is clamped between the underside of the upper plates and the top of the base plate. When screwed together, there is therefore no metallic connection between the screw unit and the profile unit, which means that the anti-rotation device according to the invention provides significantly higher sound coupling than the known solution with directly screwed steel parts. This results in additional damping, for example, between a tub's base frame and the tub's foot. This leads to significantly improved structure-borne sound properties. Furthermore, compared to the solution using a threaded rod groove, a considerably larger contact area is provided – at least the size of a corresponding screw head – thus ensuring a permanently reliable and secure connection.Furthermore, the anti-rotation device according to the invention reliably prevents the screw connection from loosening completely when, for example, the tub foot is moved to fit it into the final assembly position, since the screw head mounted in the receiving unit is reliably fixed against rotation.

[0012] A particularly preferred embodiment of the anti-rotation device according to the invention is characterized in that the first inner contour of the base plate and the second outer contour of the mold unit are polygonal, wherein the circumferential contour can be formed as an orthogonal quadrilateral, in particular as a square, according to a particularly preferred embodiment.

[0013] An advantageous embodiment is characterized in that the second inner contour of the second continuous recess of the upper plate unit is designed as a circular contour, which enables a secure reception of the screw shank of the screw connection unit.

[0014] With regard to a simple structural design, an advantageous embodiment is characterized by the fact that the width of the second outer contour of the mold unit essentially corresponds to the width or diameter of the second inner contour of the second continuous recess of the upper plate unit.

[0015] Opposite the protruding locking element, a further protruding element can preferably be provided on the upper side of the base plate, wherein, according to a particularly advantageous embodiment, a second predetermined breaking point is integrally formed between the protruding locking element and / or the further protruding element. This contributes overall to the stability of the unmounted anti-rotation device.

[0016] A particularly preferred embodiment, which ensures a secure positive fit of an inserted screw head or nut, is characterized by the fact that cantilever units are formed on the upper surface of the upper plate unit, the inner surfaces of which at least partially form the positive-locking geometry of the receiving unit for an insertable screw head or nut.

[0017] Preferably, the base plate has a downward-facing recess for inserting a washer, against which the nut is tightened when assembled. This reduces the stress on the base plate.

[0018] The first predetermined breaking point can preferably be located around the perimeter between the mold unit and the base plate, which increases the secure connection of the upper plate unit to the base plate in the unassembled state.

[0019] According to a particularly advantageous embodiment, which enables economical mass production, the anti-rotation device is designed as a plastic injection-molded part according to the invention.

[0020] Particularly high damping properties can be achieved using plastic materials.

[0021] To further improve the positive locking properties of the receiving unit of the upper plate unit, a particularly advantageous embodiment is characterized by the fact that the inside of the projection locking element and / or the further projection element forms at least partially the positive locking geometry of the receiving unit for an insertable screw head or nut.

[0022] A particularly simple design solution is characterized by the fact that the base plate is designed as a circular plate.

[0023] Further embodiments and advantages of the invention become apparent from the features further listed in the claims and from the exemplary embodiment given below. The features of the claims can be combined with one another in any way, provided they are not obviously mutually exclusive. BRIEF DESCRIPTION OF THE DRAWING

[0024] The invention, as well as advantageous embodiments and further developments thereof, are described and explained in more detail below with reference to the example shown in the drawing. The features that can be derived from the description and the drawing can be applied individually or in any combination according to the invention. The drawing shows: Fig. 1 Schematic cross-section (perpendicular to the groove of a profile) of an anti-rotation device with a base plate and an upper plate unit connected to each other via a predetermined breaking point, wherein the upper plate unit is displaceable relative to the base plate after the first predetermined breaking point has broken, Fig. 2. Schematic top view of the anti-rotation device according to Fig. 1, Fig. 3 Schematic side view (seen in the groove longitudinal direction of the profile) of the anti-rotation device according to Fig. 1, Fig. 4. Schematic detailed view of the anti-rotation device according to Fig. 1, Fig. 5a, b schematic view of the anti-rotation device according to Fig. 1 with inserted screw connection unit in the unbolted state perpendicular to the groove ( Fig. 5a) and in the longitudinal direction of the groove ( Fig. 5b) seen, Fig. 6a, b schematic view of the anti-rotation device according to Fig. 1 with inserted screw connection unit in the screwed state perpendicular to the groove ( Fig. 6a) and in the longitudinal direction of the groove ( Fig. 6b) seen with additionally shown profile with groove and Fig. 7. Schematic perspective view of the anti-rotation device according to the Fig. 1, Fig. 2, Fig. 3 to Fig. 4. WAYS TO IMPLEMENT THE INVENTION

[0025] The figures show an embodiment of an anti-rotation device according to the invention. The anti-rotation device is preferably designed as an injection-molded plastic part.

[0026] The anti-rotation device 10 has a circular base plate 14, in which in the left edge area ( Fig. 1) An upwardly pointing projection locking element 18 is formed, which has a width that essentially corresponds to the width of a groove in a profile into which the anti-rotation device 10 is inserted. Opposite the projection locking element 18, another upwardly pointing projection element 30 is formed.

[0027] The base plate 14 has a central continuous first recess 15 which has a square first inner contour 16.

[0028] Above the base plate 14 at a distance A, an upper plate unit 20 is present at approximately the middle of the height of the projecting locking element 18, to which the upper and lower edges are attached ( Fig. 2) Two upward-pointing cantilever units 32 are integrally formed. The inner sides of the cantilever units 32, the inner side of the projection locking element 18, and the inner side of the further projection element 30 form a hexagonal circumferential contour in certain areas, thus forming a receiving unit 21 into which a hexagonal screw head or hexagonal screw nut can be positively inserted from above.

[0029] A forming unit 22 is formed on the underside of the upper plate unit 20, which extends to the height of the upper edge of the base plate 14 and is connected to the base plate 14 via a first predetermined breaking unit 28.

[0030] The upper plate unit 20 and the mold unit 22 have a second continuous recess 23, which is designed as a circular cross-section and essentially corresponds to the diameter of the screw shank of a screw connection unit to be inserted, i.e. the second continuous recess 23 has a second circular inner mold contour 24.

[0031] The mold unit 22 has a second outer mold contour 26, which is square. Both the second outer mold contour unit 26 of the mold unit 22, the second continuous recess 23 of the upper plate unit 20 and mold unit 22, and the first square continuous recess 15 of the base plate 14 are arranged concentrically around a central axis 38.

[0032] The width of the second square outer contour 26 of the mold unit 22 corresponds essentially to the diameter of the second continuous round recess 23 of the upper plate unit 20 with mold unit 22.

[0033] The width of the first inner contour 16 of the first continuous square recess 15 of the base plate 14 is slightly larger than the width of the second outer contour 26 of the mold unit 22. This allows the mold unit 22 to be inserted into the first continuous square recess 15 of the base plate 14.

[0034] Additionally, a second predetermined breaking unit 34 is provided between the outer end wall of the upper plate unit 20 and the inner wall of the projection locking element 18 and the inner wall of the further projection element.

[0035] In Fig. The dashed line in 3 shows the engagement area of ​​a groove in a profile 40. When an anti-rotation device is inserted into the groove 40, this engagement area lies between the base plate 14 and the upper plate unit 20.

[0036] The assembly process is now carried out as follows (see Fig. 5 and Fig. 6).

[0037] A screw connection unit 12 with screw head 12.1 and screw shank 12.2 is inserted from above into the anti-rotation device 10. In the inserted state, the screw head 12.1 is positively locked against rotation in the receiving unit 21. Then, a washer 12.4 is inserted from below over the screw shank 12.2 and positioned in the recess 36. A nut 12.3 is then screwed onto the screw shank from below until it comes into contact with the washer 12.4. This un-tightened state is described in the Fig. 5a and Fig. 5b shown. In this state, the anti-rotation device 10 with screw connection unit 12 can be inserted into the groove of a profile 40 (see Fig. 6a and Fig. 6b) are threaded. Then the nut 12.4 is tightened. This causes the first predetermined breaking unit 28 and the second predetermined breaking unit 34 to break, and the upper plate unit 20 to be moved towards the base plate 14, whereby the forming unit 22 of the upper plate unit 20 dips into the continuous first square recess 15 of the base plate. This reduces the distance A (see Fig. 1) of the upper plate unit 20 to the base plate 14. The nut 12.3 is tightened until the upper plate unit 20 is clamped against the top of the groove wall of the profile 40. This screwed-in state is in Fig. 6a and Fig. 6b shown.

[0038] The anti-rotation device according to the invention offers, among other things, the significant advantage that there are no metallic connections between the screw connection unit 12 and the profile 40, since the profile wall is clamped via the upper plate unit 20 and the base plate 14. This results in considerably higher sound decoupling than with directly screwed steel parts. Furthermore, large bearing surfaces are provided (at least the size of a corresponding screw head), ensuring a permanently secure connection. Subsequent adjustments to achieve the final assembly position can also be carried out without difficulty, as the screw head is always securely held against rotation, thus preventing any unintentional loosening of the connection.

Claims

[1] Anti-rotation device (10) for a screw connection unit (12) which can be inserted into a groove of a profile in a way that engages behind it, with a base plate (14) having a continuous first recess (15) having a first internal contour (16) and a projection locking element (18) molded onto the base plate (14), which prevents rotation of the device when an anti-rotation device (10) is inserted into the groove, characterized by an upper plate unit (20) arranged at a distance (A) from the base plate (14), which in the installed state a receiving unit (21) for the positive locking reception of a screw head or a nut, a further continuous recess (23) with a second inner mold contour (24) for receiving a threaded shank, and to which a mold unit (22) with a second outer mold contour (26) is molded, wherein the circumferential cross-sectional dimensions of the first inner contour (16) of the base plate (14) are slightly larger than the circumferential cross-sectional dimensions of the second outer contour (26) of the mold unit (22), so that the mold unit (22) can be inserted into the first recess (15) of the base plate (14) in a form-fitting manner as soon as a The first predetermined breaking point (28) located between the molding unit (22) and the base plate (14) breaks. [2] Anti-rotation device according to claim 1, characterized by , that the first inner contour (16) of the base plate (14) and the second outer contour (26) of the mold unit (22) are polygonal in shape. [3] Anti-rotation device according to claim 2, characterized by , that the first inner contour (16) of the base plate (14) and the second outer contour (26) of the form unit (22) are formed as an orthogonal quadrilateral. [4] Anti-rotation device according to claim 3, characterized by, that the first inner contour (16) of the base plate (14) and the second outer contour (26) of the mold unit (22) are formed as a square. [5] Anti-rotation device according to one or more of the preceding claims, characterized by , that the second inner contour (24) of the second continuous recess (23) of the upper plate unit (20) is formed as a circular contour. [6] Anti-rotation device according to one or more of the preceding claims, characterized by , that the width of the second outer contour of the mold (26) of the mold unit (22) corresponds to the width and / or diameter of the second inner contour of the mold (24) of the second through recess (23) of the upper plate unit (20). [7] Anti-rotation device according to one or more of the preceding claims, characterized by , that a further projection element (30) is formed on the base plate (14). [8] Anti-rotation device according to claim 7, characterized by , that a second predetermined breaking unit (34) is formed between the projection locking element (18) and the further projection element (30). [9] Anti-rotation device according to one or more of the preceding claims, characterized by , that cantilever units (32) are integrally formed on the upper plate unit (20), the inner surfaces of which at least partially form the positive locking geometry of the receiving unit (21) for an insertable screw head or nut. [10] Anti-rotation device according to one or more of the preceding claims, characterized by , that the base plate (14) has an open recess (36) for inserting a washer. [11] Anti-rotation device according to one or more of the preceding claims, characterized by , that the first predetermined breaking point (28) is present around the circumference between the forming unit (22) and the base plate (14). [12] Anti-rotation device according to one or more of the preceding claims, characterized by that the anti-rotation device is made of plastic. [13] Anti-rotation device according to one or more of the preceding claims, characterized by that the anti-rotation device is designed as a plastic injection-molded part. [14] Anti-rotation device according to claim 7, characterized by , that the side of the projection locking element (18) and / or the further projection element (30) at least partially forms the positive locking geometry of the receiving unit (21) for an insertable screw head or nut. [15] Anti-rotation device according to one or more of the preceding claims, characterized by , that the base plate (14) is designed as a circular plate.

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