Mounting aid for easier connection of ventilation ducts using a connecting angle.

Abstract

Mounting aid for facilitating the connection of ventilation ducts by means of a connecting angle (2), screws and nuts, comprising: a) a base surface (3), b) at least two retaining points (4a and / or 4b) projecting from the base surface (3) to prevent the mounting aid from twisting in relation to the connecting angle, c) a polygonal hole (5) in the base surface (3) for the screw head or nut, and d) stop elements (6) on the side (A) of the base surface (3) opposite the projecting retaining points (4a and / or 4b), which prevent the screw head or nut from sliding completely through the polygonal hole (5).

Description

The invention relates to an assembly aid used when installing ventilation or air conditioning ducts in buildings. It facilitates the connection of rectangular ventilation or air conditioning ducts. In the prior art, a connecting angle is positioned in each corner between two air ducts to be connected (more precisely: tubular, angular segments, each of which has protruding connecting surfaces at the ends), so that one air duct can then be connected (via its connecting surface) to the connecting angle and the adjoining air duct by means of screws and nuts, as shown schematically in Fig. 3. This requires two hands, as one hand must hold the screw head and the other the nut. The necessary two-handed assembly makes working in tight spaces, such as behind ventilation ducts or in narrow corners of the building, difficult. Furthermore, CN 2 15 983 151 U describes an easy-to-install ventilation duct for the heat supply of an air conditioning system and US 10 544 891 B2 describes a system and method for joining and suspending ducts. The object of the invention is to provide a device that facilitates the assembly of ventilation ducts. It should ideally allow for one-handed operation. It should also be possible to connect the ducts even in hard-to-reach locations without direct line of sight. The device should be easy and inexpensive to manufacture. The problem is solved by the features of the independent claims. Preferred embodiments are described in the dependent claims. The invention relates to an assembly aid for facilitating the connection of ventilation ducts by means of a connecting bracket, screws and nuts, comprising: a) a base surface, b) at least two retaining points projecting from the base surface to prevent the assembly aid from twisting in relation to the connecting bracket, c) a polygonal hole in the base surface (i.e., passing through it) for the screw head or nut, and d) stop elements on the side of the base surface opposite the projecting retaining points, which prevent the screw head or nut from sliding completely through the polygonal hole. In use, the mounting aid is permanently (but releasably) connected to a (prior art) connecting bracket. It is irrelevant whether one or both of the ventilation ducts to be connected are already connected to the connecting bracket or not. The base is designed so that it can be placed against a prior art connecting bracket at the corner. The holding points protrude from the base (all on the same side), preventing it from rotating under shear forces and holding it in position. The multi-sided hole prevents the screw head or nut from rotating, as the base (which, in this context, refers to the body as consisting of a base and a surface on the opposite side) completely encloses the multi-sided screw head or nut. One-handed operation is possible. The assembly aid is essentially flat and preferably L-shaped, but symmetrical, so that both legs of the L have the same length and shape. The “multi-sided hole” according to the invention passes through the mounting aid. The "impact elements" according to the invention ensure that a screw head or nut is prevented from moving in at least one direction (perpendicular to the plane of the base). It is also possible that only one impingement element is present, as in the case of a ring. According to the invention, the assembly aid thus comprises at least one impingement element. Depending on the design, they allow the screw heads / nuts to be inserted into the assembly aid from both sides of the base or only from one. According to the invention, the screw head / nut can no longer fall out towards side A (i.e., the side of the base opposite the protruding retaining points). The impingement elements have partial surfaces that abut the top of a screw head or one side of a nut and prevent it from falling out of the polygonal hole. These can be, as described below, for example, hooks or a ring. The mounting aid has a base body with the aforementioned base area and on the opposite side of the base body this "side of the base area opposite the protruding holding points". The phrase "on the side of the base opposite the protruding holding points" also includes the fact that, for example, in the case of barbed pins, as in Fig. 1, the barbed pins do not protrude beyond the base because, for example, the base has a recess within which the pins (at the base) are inserted and, including the barbs (at the loosely protruding end of the pins), extend in the direction of "the side of the base opposite the protruding holding points". Screws (preferably with multi-sided screw heads) or nuts of a size of M8, M10 or M12 are usually used. The invention also relates to a method for manufacturing an assembly aid according to the invention, comprising the step of layer-by-layer 3D printing or injection molding. The resulting assembly aid is advantageously a one-piece assembly aid made of plastic or metal. Suitable 3D printing methods include 3D filament printing or 3D laser printing with powder. Furthermore, the invention relates to a kit comprising such an assembly aid according to the invention, as well as a screw and / or a nut. It is also advantageous if the kit includes several assembly aids, each with a screw and a nut (per assembly aid). This is because one screw and nut pair is used per assembly aid. It is possible that the mounting aid and the screw or nut will already be provided pre-assembled. Advantages The mounting aid according to the invention facilitates the assembly of ventilation ducts to one another. A further advantage is that it allows for one-handed operation. This enables ventilation ducts to be connected in hard-to-reach places. The mounting aid can be manufactured simply and cost-effectively. The mounting aid can be completely removed again (after tightening the screw and nut with the connecting angle and the edge surfaces of both ventilation ducts in between), so that no plastic remains on the ventilation systems, which is advantageous in terms of fire load. Connecting brackets and mounting aids can be prepared on the ground by connecting them together. The invention facilitates the installation of ventilation ducts, particularly in areas with limited space. The invention is universally applicable, meaning it can be used with both screws and corresponding nuts. Therefore, the screw direction can be freely chosen. The currently used connection method for ventilation ducts does not need to be changed; the force transmission remains unchanged. This is because the mounting aid is always located outside the connection between the screw and nut, not between them. The forces on the connection remain completely unaffected by the mounting aid. The mounting aid simply simplifies the installation process, particularly the tightening of the screws in place. Preferred embodiments There are three known sizes of connecting brackets for ventilation ducts (P20, P30, and P40). The size of the holes (for the holding points according to the invention) and the thickness of the material (3 mm) are approximately the same for all three variants. At their thickest point, they are 20 mm, 30 mm, or 40 mm wide. In preferred embodiments of the invention, in the variant with boundary surfaces, the distances between each boundary surface and the opposite outer edge of the mounting aid (viewed along the base surface) are also 20 mm, 30 mm, or 40 mm (each with a range of ±10%). For these three sizes of the connecting angle, hexagonal nuts or bolt heads of size M8, M10, or M12 are sensibly used. For size P30, size M10 or M12 can be used. The polygonal hole according to the invention preferably has a hexagonal shape and a size of M8, M10, or M12. The following table shows the known sizes of such M8, M10 or M12 screw heads or nuts and the distances between opposing outer corners or opposing outer surfaces. M8 14.4 mm 13 mm M10 18.9 mm 17 mm M12 21.1 mm 19 mm In a preferred embodiment of the invention, the mounting aid has at least three holding points, of which at least one is designed as a (round rod-shaped) locking pin and at least two as limiting surfaces (in the sense of holding surfaces as "holding points"), wherein the limiting surfaces are arranged essentially perpendicular to each other. Preferably, there are at least two such locking pins; exactly two are also possible. Preferably, there are two such locking pins and two of the aforementioned boundary surfaces arranged perpendicular to each other. "Perpendicularly arranged boundary surfaces" means that the boundary surfaces can conform to the right-angled outer edge of common angle brackets. They are sensibly positioned away from the base (of the mounting aid) so that they also form an edge, allowing them to conform to the outer edges of the angle brackets and further preventing the mounting aid from twisting relative to the angle bracket. It is also conceivable that there is only one such locking pin and one holding surface. Alternatively, there could be two holding surfaces and no such locking pin. The locking pins can have a diameter of 4-7 mm, or even 4-6 mm, or 4-5 mm (this refers to the widest diameter, i.e., including any optional lamellae or mushroom-shaped features described below). The minimum diameter is 4 mm to ensure the pin holds securely in the hole, and the maximum diameter is 7 mm. The length (measured from the base to the end of the pin) can be 5-12 mm, 6-8 mm, or even 6-7 mm. The advantage of the above-mentioned design with a locking pin and two holding surfaces is that, in addition to preventing the mounting aid from twisting relative to the connecting angle, it also prevents the mounting aid from falling off the connecting angle on its own. “Essentially perpendicular to each other” means 80-100°, better 85-95°, where common connection angles have almost exactly 90° angled outer edges, so that 90° between the boundary surfaces is particularly preferred (±2%). These boundary surfaces therefore form a corner and are particularly preferably positioned at a 90% angle to the base surface, so that the mounting aid can be slid laterally onto a connecting piece. Preferably, the base also aligns with the boundary surfaces located at two of its outer edges. It is particularly preferred in the aforementioned embodiment with at least three holding points, of which at least one is a locking pin and at least two are boundary surfaces, if a right angle is formed by the two boundary surfaces, which are arranged substantially perpendicular to each other, and a mirror plane of the mounting aid runs at its midpoint (with reflection neglecting all locking pins and push-in elements – that is, neglecting mirror symmetry), wherein the mirror plane is perpendicular to the base surface. "At its midpoint" thus means at an angle of 45° to one boundary surface and 45° to the other boundary surface. This means that the mounting aid (ignoring the locking pins) can be mirror-symmetrical when viewed from above on the base. If there are two locking pins, they would logically be arranged to maintain this mirror symmetry. This also corresponds to the L-shape with identically shaped legs described earlier. It is possible that the mounting aid has a thinner base at the left and right ends (when viewed with a mirror plane in the middle) than in the remaining central areas, for example, 4-6 mm thinner, or even 5 mm thinner. The "remaining central area" is defined as the area around the polygonal hole, extending radially outwards to a maximum distance of 5 mm from the outer edges of the polygonal hole. It is also preferred in the above-mentioned embodiment (with at least three holding points, of which at least one is a locking pin and at least two are boundary surfaces) if the locking pins have circumferential lamellae and / or a mushroom shape, and / or are traversed (i.e. simply slit) or even crossed (double slit) and / or have a point. "Slit" means that a vertically oriented pin is slit from top to bottom towards the base, to a length of 40-100%. "Crossed" refers to two such cuts arranged perpendicular to each other ("bottom" being the direction in which the pin rests on the base). It is particularly preferred that the pin is slit or crossed to a length of only 40-70%, or even completely. The advantage of slotted or crossed designs is that they allow for movement, enabling them to be inserted into the holes of a connecting angle without breaking. The lamellae or mushroom shape prevent the connector from unintentionally coming loose from the holes in the angle bracket. The mushroom shape allows it to snap into place in the holes of the connector. The advantage of the tip is that silicone residue often present in the holes of connecting brackets can be easily pierced when the mounting aid is connected to the connecting bracket. The combination of mushroom shape with a point and slitting or crossing of the locking pins is particularly preferred. In particular, the locking pins and the entire mounting aid can be made of metal (advantageously non-flammable). This allows it to remain attached to the ventilation ducts, which is also possible due to its ease of manufacture and the associated low price. In a preferred embodiment (the above embodiment with at least one locking pin and at least two boundary surfaces), the two boundary surfaces are connected by a retaining roof, which is planar and triangular and runs parallel to the base surface, so that a triangular gap is created between the base surface, boundary surfaces and retaining roof. The retaining bracket, which covers the angle defined by the essentially perpendicular boundary surfaces (also known as boundary edges), creates a triangular gap. The connecting bracket for the ventilation ducts can be inserted into this angled gap (formed by the retaining bracket, the two boundary surfaces at their intersection, and the base). This allows the at least one locking pin to be inserted into the designated holes in the connecting bracket. The mounting aid then sits securely on the connecting bracket and can no longer be rotated. It will no longer fall off the connecting bracket on its own. The advantage is that this provides two attachment points for the connecting angle (the point between the mounting roof and the base in the corner between the two boundary surfaces, as well as at least one locking pin). Two locking pins are particularly preferred, resulting in a total of three attachment points. In a preferred embodiment of the invention, both boundary surfaces each have a boundary surface projection located in the latter half of the length of the respective boundary surface. This "length" refers to the viewing direction starting from the point where both boundary surfaces touch at a perpendicular angle, in the direction along the connecting edge between the respective boundary surface and the base surface. This is the edge of the base surface from which the boundary surface projects. Such boundary surface projections are essentially perpendicular to the respective boundary surface and are located on the side opposite the base surface (the boundary surface). They are particularly likely to be located in the last third of this length or even at the end (so that you finish with this end of the boundary surface length). They are ideally 2-20 mm wide and project 0.5-2 mm forward. However, if the projection only projects 0.5 mm forward, it could also be designed to run the entire length of the respective boundary surface. This would utilize the entire length as an additional support. Advantageously, each boundary surface has a boundary surface projection. A particularly advantageous embodiment of the invention is the combination of the version with a retaining roof with this version with two boundary surface projections and with crossed locking pins, so that a total of two boundary surfaces, each with one boundary surface projection and with two crossed locking pins in a mushroom shape, are present, as shown in Fig. 5. A particularly preferred dimension of the retaining roof (between the angle apex, which is spanned by the two boundary surfaces, along the angle-bisecting axis) is 4-12 mm, most preferably 4-7 mm. These dimensions are optimal to provide sufficient support while still allowing assembly, and at the same time save unnecessary material. A combination with a locking pin length of 5-8 mm, or even 5-6 mm, would be particularly preferred. In a preferred embodiment of the mounting aid according to the invention, the holding points (or, in particular, the limiting surfaces in embodiments with such) protrude 3-6 mm from the base surface. In the case of the boundary surfaces, this means that they protrude from the surface of the base (on the side where all the holding points are located), preferably at an angle of 90°, so that they form a perpendicular holding edge that can be placed against the outer edge of a connecting angle. It is also preferred if the polygonal hole in the mounting aid according to the invention is a hexagonal hole. This is because it is well suited for common screw heads or nuts used when connecting ventilation ducts with screws and nuts. In another preferred embodiment of the invention, the assembly aid is manufactured in one piece and made of metal or plastic. For example, suitable plastics include PET (polyethylene terephthalate) or PETG (a copolymer of polyethylene terephthalate and glycol). A metal version is particularly preferred. Regarding the fastening elements, in one embodiment of the invention it is preferred if these fastening elements are designed as at least three protruding pins with barbs, or as at least three protruding pins with a ring, or as a ring; particularly preferably three or six pins, especially six, since common screw heads or nuts have a hexagonal shape. In the embodiment with a ring (without pins for fastening the ring), the ring is arranged at the end of the polygonal hole (on the side of the base surface opposite the protruding fastening points) or can be flush with it. In all versions with a ring, the inner diameter of the ring is smaller than the mean diameter of the polygonal hole, so that the screw head or nut abuts the ring. The "barbs" sensibly have a half-roof shape, in the sense of a number 1, with the space between the roof and the pin being filled, as can be seen, for example, in Fig. 1. The barbs should ideally point inwards (in the direction of the mirror axis of the polygonal hole). As mentioned earlier, the pins should preferably be 4-8 mm or even 4-6 mm long. The ring width is preferably 2-6 mm (for P20 type connecting angles), ideally only 2-5 mm, or 2-3.5 mm. This is because sufficient "residual hole" must remain for the screw body. The at least three protruding pins with ring are sensibly attached to the outer edge of the ring (e.g., fused together as a single piece), so that when a screw head or nut is inserted into the polygonal hole, it can be moved past the pins and finally comes into contact with the ring, thus preventing it from passing further through the hole. The barbs serve the same function. More precisely, this means that the ring touches each of the pins (preferably cuboid-shaped bridges) on the side of the respective pin that points in the direction of the axis of symmetry of the polygonal hole. In both versions (with ring or with barbs), the pins are preferably square, even cuboid, so that one surface of each can fit well against the outer surfaces of the screw head or nut. In the version with ring (without pins for attaching the ring), it is connected to the mounting aid along the polygonal hole and along its outer diameter. In the version with barbed pins, the surface of the mounting aid (opposite the base) can be level with the top edge of the pins. However, the pins can also protrude outwards and extend above this surface. One possible embodiment of the invention involves the engagement elements being designed as at least three protruding pins with barbs, wherein the length of the barbs (viewed in the direction perpendicular to the base surface, i.e., along the longitudinal axis of a pin) differs between adjacent barbs by a value of between 0.1 and 0.25 mm. As already mentioned, "barb" in the sense of the invention means that the screw head or nut is prevented from slipping out of the polygonal hole in one direction. That is, the barbs (in the sense of a half-roof shape) are of different depths (or extend of different lengths along the pin). This advantageously addresses a difference in height between the screw head and the nut.Nuts can be inserted through the polygonal hole from the side of the base opposite the protruding retaining points (side A), allowing both thick nuts and thinner screw heads to engage with at least one corresponding barbed pin. In both cases, a flush surface is created between the base and the underside of the nut or screw head on the side of the base from which the retaining points protrude. With these designs featuring barbed pins, it is particularly advantageous if the protruding barbed pins are flush with the base surface on the side (A) opposite the projecting mounting points. This means that, in the case of a multi-sided recess (as described below), they do not terminate flush with the base surface within the recess, but rather with the outermost area of ​​the base surface. Thus, on the surface opposite the mounting points, there is a flush finish between the surface of the mounting aid and the end of the pins. It is advantageous that several mounting aids can be easily stacked and, for example, secured with rubber bands. In a preferred embodiment (of the versions with barbed pins or ring pins), a mounting aid comprises six push-in elements, all of which (6a, 6b) have a thickness (in the direction perpendicular to the multiple axis of rotation of the polygonal hole) of 1.5 mm ± 0.5 mm. A thickness of 0.5–2.0 mm or 1.3–1.7 mm is also possible. It is particularly preferred if all six push-in elements are protruding barbed pins. In a preferred embodiment of the invention, the base surface has a thickness of 3-12 mm (particularly preferably 7-11 mm, in each case excluding the boundary surface, i.e., only the thickness of the base surface) and, in addition to the polygonal hole according to the invention, has a polygonal recess on the side (A) of the base surface opposite the projecting mounting points, within which the connecting elements are attached to the base surface. The thickness, by way of correction, applies to the entire base body of the mounting aid, i.e., the area between the base surface and the surface of the mounting aid opposite this base surface. The polygonal recess is only a recess within the "thick" base surface and is to be distinguished from the polygonal hole (which pierces the base surface). The polygonal recess advantageously has a larger radial extent than the polygonal hole. "Radial" in the context of the invention means extending from the center point in the direction of the radius. This advantageously provides space for the impact elements to move by bending. It is logically the same polygon variant (e.g. hexagon) between polygon hole and polygon recess, whereby only the polygon recess is larger than the polygon hole, as can be seen in Fig. 1. It is also possible that this thickness (of the base surface) is only present around the entire perimeter of the polygonal recess (within a width of 1-5 mm (or even just 1-3 mm)), while in a more distant area the thickness is reduced to save material, for example, only 2-6 mm or even just 2-4 mm. For minimum strength, a perimeter width of 1-2 mm (around the polygonal recess) is recommended, ensuring that at least a 1-2 mm wide rib exists on one side of the polygonal hole. Preferably, there is a gap of 1-2 mm between the polygonal recess and the abutment element (ideally with a square profile for the abutment elements) (around the entire circumference of the polygonal recess). This applies to all abutment elements. Taking into account the thickness of the push-in elements, a distance of approximately 1–3.5 mm, or even 2–3.4 mm, or 2–3 mm is preferably maintained between the edges of the polygonal recess and the edges of the polygonal hole (at their nearest points). Fig. 1 shows a preferred embodiment according to embodiment 1 (left: from above or obliquely from above; right: from obliquely below). This embodiment has locking pins (4b) that simply pass through a hexagonal hole with barbed pins (6a) on a polygonal recess (5b) (also hexagonal). The triangular retaining cap (4c) shown forms a gap (4d) below it in Fig. 1 (right). The base (3) has the same thickness throughout. Fig. 2 shows another embodiment with a ring (6c) as the push-in element (6). At the end of the polygonal hole (5) is a ring (6c), which can be seen in the top view in Fig. 2 / left looking at side (A). In the bottom view (Fig.In Fig. 2 (right), the ring (6c) against which a screw head (or nut) inserted from below can abut is visible. Fig. 3 shows the prior art use of connecting angles for connecting ventilation ducts. Fig. 4 shows (sketchily and in part) two embodiments of the invention in which the abutment elements (6) are designed as pins with barbs (6a) (right) or as pins with a ring (6b) (left) – the polygonal hole (5) is not shown in Fig. 4 (left), but is present in the same way. Fig. 5 shows an embodiment of the invention with a retaining roof (4c), two boundary surface projections (4e), and crossed locking pins (4b), so that a total of two boundary surfaces (4a), each with a boundary surface projection (4e) and two crossed locking pins (4b) in a mushroom shape, are present. Unless otherwise specified, it is advisable to combine the different embodiments. The invention will now be explained in more detail with reference to several preferred embodiments. These embodiments are not intended to limit the invention. Examples of implementation Exemplary embodiment 1 is shown in Fig. 1. As mentioned above, this embodiment has two locking pins (4b) through which a hexagonal hole with barbed pins (6a) is inserted into a polygonal recess (5b) (also hexagonal). The triangular retaining cap (4c) shown forms a gap (4d) (not visible in Fig. 1, on the right under the retaining cap (4c)). The base (3) has a uniform thickness. Exemplary embodiment 2 is shown in Fig. 2. It could also be understood as a design with circumferential pins, in which the pins line the polygonal hole (5) (here a hexagonal hole) and are thus part of the base surface (3) (more precisely: the base body of the mounting aid). However, this embodiment is better understood as one in which the ring (6c) is attached to the polygonal hole (5) along its outer diameter. The ring (6c) is flush with the surface of the mounting aid on side (A). The inner diameter of the ring is smaller than the mean diameter of the polygonal hole (5), so that the screw head or nut abuts the ring (6c). Exemplary embodiment 3 is shown in sketch form and in part in Fig. 4 / left. Exemplary embodiment 4 is shown in sketch form and in part in Fig. 4 / right. Exemplary embodiment 5 is shown in Fig. 5. Reference sign 2 Connecting brackets 3 Base surface 4a Boundary surfaces (as holding points) 4b Locking pins (as holding points) 4c Holding roof 4d Gap (between holding roof, base surface and boundary surfaces) 4e Boundary surface projection 5 Polygonal hole 5b Polygonal recess 6 Push-in elements (for screw or nut) 6a Pins with barbs (as push-in elements) 6b Pins with ring (as push-in elements) 6c Ring 7 Ventilation channel A Side of the base surface opposite the protruding holding points

Claims

Mounting aid for facilitating the connection of ventilation ducts by means of a connecting angle (2), screws and nuts, comprising: a) a base surface (3), b) at least two retaining points (4a and / or 4b) projecting from the base surface (3) to prevent the mounting aid from twisting in relation to the connecting angle, c) a polygonal hole (5) in the base surface (3) for the screw head or nut, and d) stop elements (6) on the side (A) of the base surface (3) opposite the projecting retaining points (4a and / or 4b), which prevent the screw head or nut from sliding completely through the polygonal hole (5). Mounting aid according to claim 1, wherein at least three holding points (4a and / or 4b) are provided, of which at least one is designed as a locking pin (4b) and at least two as boundary surfaces (4a), wherein the boundary surfaces (4a) are arranged substantially perpendicular to each other. Mounting aid according to claim 2, wherein a right angle is formed by the two substantially perpendicular boundary surfaces (4a), in the center of which a mirror plane of the mounting aid runs, neglecting all locking pins (4b) and push-in elements (6) which are perpendicular to the base surface. Mounting aid according to one of claims 2 or 3, wherein the locking pins (4b) have circumferential lamellae and / or a mushroom shape, and / or are traversed and / or have a tip. Mounting aid according to one of claims 2 to 4, wherein the two boundary surfaces (4a) are connected by a retaining roof (4c) which is planar and triangular and runs parallel to the base surface (3), so that a triangular gap (4d) is formed between the base surface (3) and the retaining roof (4c). Mounting aid according to one of claims 2 to 5, wherein both boundary surfaces (4a) each have a boundary surface projection (4e) which is located in the last half of the length of the respective boundary surface (4a), wherein the length from the point of contact of both boundary surfaces (4a) runs along the edge of the base surface (3) (3) from which the boundary surface (4a) projects. Mounting aid according to one of claims 1 to 6, wherein the holding points (4a and / or 4b) protrude 3-6mm from the base surface (3). Mounting aid according to one of claims 1 to 7, wherein the polygonal hole (5) is a hexagonal hole. Mounting aid according to one of claims 1 to 8, wherein the mounting aid is one-piece and made of metal or plastic. Mounting aid according to one of claims 1 to 9, wherein the push-in elements (6) are designed as at least three protruding pins (6a) with barbs or as at least three protruding pins (6b) with a ring or as a ring (7). Mounting aid according to claim 10, wherein six push-in elements (6) are included and all pins (6a, 6b) thereof have a thickness of 1.5mm±0.5mm. Mounting aid according to one of claims 1 to 11, wherein the push-in elements (6) are designed as at least three protruding pins (6a) with barbs and wherein the protruding pins (6a) with barbs are flush with the base surface (3) on the side (A) opposite the protruding holding points (4a and / or 4b). Mounting aid according to one of claims 1 to 12, wherein the base surface (3) has a thickness of 7-11 mm and, in addition to the polygonal hole (5) according to the invention, has a polygonal recess (5b) on the side (A) of the base surface (3) opposite the projecting holding points (4a and / or 4b), within which the bumper elements (6) are connected to the base surface (3). Method for manufacturing an assembly aid according to one of claims 1 to 13, comprising the step of layer-by-layer 3D printing of the assembly aid or injection molding of the assembly aid. Kit comprising an assembly aid according to one of claims 1 to 13, as well as a screw and / or a nut.

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