DE29519905U1 - Perforated foil tape for building purposes - Google Patents

Description

Description

The invention relates to a perforated film strip for construction purposes, in particular for producing ventilation grilles, e.g. for closing elongated ventilation openings on ventilated facades of buildings, as well as for other applications, which are explained in the following description.

When manufacturing and installing ventilated facades on buildings, the openings below and above the insulation, which must be kept open for ventilation purposes, are closed with covers made of a perforated foil tape material, for example using perforated sheet metal strips. This is to prevent small animals such as birds, vermin or the like from entering the insulation and, on the other hand, to allow air to enter the insulation for ventilation and, if necessary, to allow moisture to escape from the insulation.

Film tape made of an age-resistant plastic is usually preferred over perforated sheet metal strips because plastic film tape is easier to roll, transport and process. The film tape is available in various widths so that the width of the film tape can be selected to at least approximately match the width of the opening to be closed. Widths of 50, 80, 100 and 150 mm are common. If there is no sufficiently narrow film tape or no film tape of the desired width available at the construction site, a strip of the appropriate width is usually cut from the existing film tape. Cutting the film tape precisely requires particular skill and care to avoid waste. The film tape is bulky because it is usually 1 to 1.5 mm thick. The amount of work involved in cutting it is high, especially considering the great lengths of the openings to be closed.

The same problem arises with ventilated roof coverings on buildings, where corresponding openings at the end of the underlayment are also closed with corresponding ventilation grilles. Here too, the openings to be closed have different widths, so that strips of the perforated foil tape have to be cut to the appropriate width.

The task is therefore to produce a perforated film tape that allows easier processing on site and, in particular, easier adjustment of the film tape to the required width.

According to the invention, the above object is achieved in that

the film strip for forming a fold line on at least one surface
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has at least one notch,

which runs in the longitudinal direction of the film strip and

- is designed in such a way that a strip of the film tape can be folded or bent along the notch relative to the rest of the film tape.

According to the invention, the stated task is solved in a very simple way and requiring only very little effort in the production of the foil strip, in that the usually necessary width adjustment of the ventilation grille by marking and processing, in particular cutting the foil strip, whereby it is important to ensure that the exact width of the strip to be separated is maintained, is no longer necessary. Instead, the foil strip, and in particular on at least one surface of the foil strip, is provided with a

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There is a fold line between the notches in the film tape running lengthwise - in the simplest case, one notch is sufficient - with which a strip corresponding to the excess width of the film tape can be easily and simply and, above all, very precisely folded or bent in relation to the rest of the film tape. As a rule, the strip can be unfolded by hand, preferably at an angle of 90° to the rest of the film tape, which forms the actual ventilation grille. In special cases, the excess strip can also be easily separated from the rest of the tape along the fold line formed by the notch. As a rule, however, the strip is only folded up so that the rest of the film tape can be inserted into the opening as a ventilation grille in the now appropriate or adjusted width. The unfolded strip also serves to stiffen the ventilation grille along the edge or also along the edges if a strip is unfolded on each of the two sides of the foil tape.

The film strip provided according to the invention with at least one notch, but preferably with a plurality of notches running in the longitudinal direction of the film strip, can be processed significantly more quickly and much more precisely, namely while precisely maintaining the adjusted width, directly on the construction site, so that a considerable time saving is achieved when closing ventilation openings using ventilation grilles.

Preferably, the fold line along which the excess strip is to be unfolded relative to the rest of the foil tape is formed by notches that are aligned opposite one another on the two surfaces of the foil tape. This double notch makes it easier to unfold the excess strip, and, moreover, there are no differences in the folding properties if the two opposing notches are formed in the same way, regardless of which of the two possible directions the strip is folded in.

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The foil tape is preferably made of plastic, in particular a PVC, PE or PP material. In any case, an ageing-resistant and impact-resistant plastic is used that meets the requirements for ventilation grilles. The plastic material also avoids material compatibility problems right from the start. Metal grilles or perforated metal sheets are usually offered in zinc, copper and stainless steel versions so that a correspondingly compatible metallic material can be selected depending on the application conditions. The need for such a material selection is eliminated if a perforated foil tape made of plastic is used.

It is possible to subsequently incorporate the notches intended for forming the fold lines into the film strips, for example by milling them. However, according to the invention, it is preferred that the notch or notches are already formed or embossed when the film strip is formed. In this way, there is practically no additional effort required for the production of the film strip according to the invention compared to the previously known film strip material.

According to a further development of the invention, the shape and depth of the notch are selected in such a way that the surface stiffness of the foil strip is essentially maintained and the strip to be bent or unfolded can nevertheless be easily bent or unfolded from the rest of the foil strip by hand or with the help of a tool. This makes it clear that the notches should not lead to such a weakening of the material of the foil strip that the flat course of the foil strip is no longer guaranteed and, for example, unwanted edges can be seen that have practically formed themselves during assembly or handling with the ventilation grille or with the foil strip. On the other hand, the excess strip of the

Allow the foil tape to be easily unfolded or bent by hand along the fold line.

According to the invention, it is preferred that the bent or unfolded strip remains connected to the rest of the film strip, although the invention also makes it significantly easier to separate an excess strip from the film strip in a dimensionally accurate manner.

The notch is preferably V-shaped or U-shaped. In any case, in order to avoid undesired separation of the strip from the rest of the film strip, a notch effect that leads to breaking or tearing of the material should be avoided.

According to a further development of the invention, it is provided that the depth of the notch - in the case of one notch on each of the two surfaces of the foil strip, the depth of both notches together - is approximately 5 - 60%, preferably 15 - 25% of the thickness of the foil strip, the thickness of the foil strip preferably being in the range of 1 - 1.5 mm.

An important development of the invention is that the notch runs in the connecting line of the holes in the film strip, in particular in the connecting line of the hole centers, namely in the case of circular holes, or hole center lines, namely in the case of essentially oval holes. This position of the notch or notches means that the film strip experiences the least possible weakening of the surface stiffness, and in addition, the folding or bending of the excess strip of the film strip is made much easier by the fact that the folding work only has to be carried out on the bridges connecting the holes, whereby the bridges are naturally shortest in the line of the hole center axes.

To form the desired fold lines along the fo-

For the foil strip, various forms of material weakening can be considered, which specify and facilitate folding up at a specific point with a specific course. Instead of a notch, which usually has a certain extent or length, theoretically, depressions arranged in a row at points can also be considered. A notch can also be used, which consists of a series of individual notches spaced apart in a line. According to the invention, however, it is preferred that the notch runs along the foil strip without interruption - unless there are interruptions due to the perforation if the notch runs in a row of holes. This is because a continuous notch makes it easier to fold evenly.

Another very important variant of the invention provides that the film strip - following a grid dimension - has a large number of parallel notches spaced apart from one another, preferably along the center axis of each row of holes in the film strip. The grid dimension can take into account the most common widths of the ventilation grilles. Since the center axes of the rows of holes are preferably about 5 - 8 mm apart, it is generally best if fold lines are formed by notches along the center axis of each row of holes in order to provide the narrowest possible grid dimension.

Preferably, the shape of the holes in the foil strip is preferably rounded, namely circular or oval or rectangular with rounded corners. This is because the perforation is usually made by punching out the otherwise finished foil strips. Since the free cross-sectional area, namely the sum of the holes in the perforated foil strip material, is usually about 50% of the total area, a relatively high amount of plastic waste is created by punching out the holes, which must be reused. For reuse, it is essential that the foil punched pieces are free-flowing. This is the case, for example, with round and oval punched pieces of the

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This is the case, but not with square waste pieces. For this reason and the further reason that square punchings can lead to undesirable weakening of the material, rounded or round hole shapes are preferred.
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Another very important development of the invention is that the film strip consists of two layers of plastic that are firmly connected to one another or formed together and whose color is different - at least on the surface. Generally, four colors are used for ventilation grilles, namely black, brown, red and in individual cases also white. The above-mentioned development of the invention means that the need for four colors can be met with only two film strip versions because of the possibility of turning them. The surface desired according to the color is arranged so that it is visible on the outside.

An alternative application of the invention is that cover elements for gutters, namely for rain gutters, are made from the foil strip. Previously, other elements such as grilles have been used to cover the openings of gutters. The cover of the opening of gutters is intended to prevent leaves and other objects from getting into the gutter and clogging it. However, the cover elements must be designed in such a way that the flow of rainwater in particular to the gutter and in the gutter itself is maintained without impairment. Metal grille covers for gutters already exist, but these have material compatibility problems. Plastic elements in the form of tubular lattice bodies are also known, which are inserted into the gutter and partially protrude from the opening of the gutter. However, the problem of covering with such plastic tubular lattice bodies is only inadequately solved. On the one hand, the grid tube body lying in the gutter disturbs the keeping of the interior of the gutter clear, so that accumulations of small or finer particles can easily accumulate on the grid, so that the free flow through the

On the other hand, the tubular lattice body protruding from the gutter impairs the appearance of the gutter, and wedge-shaped gaps form on both sides of the pipe body between the gutter and the tubular lattice body, which can become clogged with leaves, etc.

However, the invention makes it very easy to adjust the width of the foil strip to the opening width of the respective gutter. A range of different types of holding elements are possible for positioning and holding the cover elements made of foil strip, which should otherwise essentially close the gutter opening flush. For example, the edge strips angled downwards on both long sides of the cover elements can be used for positioning and also for holding the cover elements made of foil strip in the opening area of the gutter. Instead of this or in addition to this, easily attachable spacers in the form of rods or bars or the like can be used on the inside of the cover elements made of foil strip for positioning, which support the cover elements on the floor and on the side walls of the gutter.

Embodiments of the invention are explained in more detail below with reference to the drawings. In the drawings show:

Fig. 1 is a schematic and perspective view of a section of a perforated film strip in sectional view;

Fig. 2, 3 and 4

schematic top views of perforated foil strip sections with different hole patterns; 35

Figs. 5, 6 and 7

Cross-sectional views of part of a section

a perforated foil tape with differently shaped or arranged notches;

Fig. 8 purely schematic illustrations a) - d) to show the folding of a film strip section lengthwise

a fold line formed by a notch or notches;

Fig. 9 is a purely schematic cross-sectional view of a gutter with a cover made of a perforated

foil tape;

Fig. 10 is a cross-sectional view of another embodiment of a gutter covered with a perforated foil strip;

Fig. 11 is a purely schematic representation of an attachment of a perforated foil strip to a gutter;

Fig. 12 and 13

a schematic representation of a connection between the upper part of a support or the like and a perforated foil strip, in particular in connection with the use of perforated foil strips as covers for gutters.

In the example shown in Fig. 1, a section of a film strip with a hole pattern consisting essentially of oval holes 2, as shown for example in Fig. 3, is produced by punching the oval holes 2 out of a strip-shaped, in particular continuously running, plastic strip. The dimensions given in Fig. 3 are to be understood purely as examples and refer to a strip width of 100 mm.

In the example of Fig. 1, on both surfaces 3, 4 of the foil strip 1 in the direction indicated by the arrow 5

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The notch 6 running in the longitudinal direction of the film strip 1 and in the direction of the longitudinal center axes of the oval holes 2 is already embossed during the manufacture of the film strip 1 to form fold lines 7 at the base of the notch, of which only one of the fold lines 7 on the surface 3 of the film strip 1 is shown for the sake of clarity.

Since the notches 6 run in the direction of the rows of holes, they only occur on the bridges 8 connecting adjacent holes 2 of a row of holes.

In the case of the dimensions shown in Fig. 3, the notches running parallel and spaced apart from one another, as well as the rows of holes - based on their center line - have a distance of 8 mm, so that this distance is the grid dimension for the fold lines 7.

Fig. 2 illustrates another embodiment in which the film strip 1 has a perforation of circular holes 2 that are arranged in staggered rows with a center line distance of 6 mm. The notches 6 are here, as the cross-sectional view in the left part of the illustration shows, only formed on one of the two surfaces.

In the rows of holes of the third embodiment according to Fig. 4, oval and round holes 2 alternate, with a center line spacing of 7.6 mm, which corresponds to the grid dimension for the fold lines.

The ratio of the free cross-sectional area, i.e. the sum of the hole areas to the closed areas of the film strip 1, is approximately 50% in each of the three embodiments shown.

In Fig. 5 it is shown purely schematically that the foil strip 1 can have the notch 6 only on one surface 3,

and in fact in an approximately V-shaped cross-section. In contrast, Fig. 6 illustrates a notch 6 with an approximately U-shaped cross-section, also arranged only on the surface 3 of the film strip 1. Fig. 7, on the other hand, shows a double arrangement of notches 6 on the film strip 1, which are aligned opposite each other on the two surfaces 3, 4 of the film strip 1, so that a fold line 7 is formed there approximately in the middle area.

In Fig. 8, the purely schematic illustrations a) d) illustrate how the fold lines 7 formed by the notches 6 are used to bring a film strip 1 to the desired width in a very simple manner. Fig. a) shows a cross-section of a film strip 1, of which only the width from the right edge 11 to the fold line 7 is used, so that an excess strip 9 results. This is - illustrated by the arrow 10 - bent around the fold line 7 or folded up until the 90° position shown in figure b) is reached in relation to the film strip 1.

Usually, the film strip 1 can already be processed after this shortening of its width, for example as a ventilation grille to close an elongated ventilation opening on a ventilated facade of a building. The strip 9 in this case contributes to the stability or surface rigidity of the film strip 1. However, if the strip 9 is not needed in the 90° position shown in Figure b) or is a hindrance, the strip 9 can also be completely unfolded onto the film strip 1, as Figure c) shows, or, what is not shown, cut off.

Illustration d) of Fig. 8 shows that it is also possible to produce the desired width of the film strip 1 by folding out one strip 9a or 9b on each of the two side edges of the film strip 1.

Fig. 9 shows schematically another application of the perforated foil tape, which has notches in the same way as the

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the previously described foil strips, but without the notches being shown separately. This also applies to the other examples in Figs. 10 - 13.

Fig. 9 and 10 show how the perforated foil strip 1 can be used to cover gutters 12 or rain gutters, in such a way that the rainwater dripping from the roof tiles 13 can enter the interior of the gutter 12 unhindered through the perforations of the foil strip 1 and flow through the interior of the gutter to the drain (not shown). The foil strip 1, which covers the opening of the gutter 12 approximately flush, is positioned and held in the gutter 12 by schematically indicated supports 14. In the embodiment according to Fig. 10, holder inserts 15 connected to the foil strip 1 at certain intervals are used, which, like the supports 14 of the first embodiment, are preferably also made of plastic and are firmly connected to the foil strip 1 in a simple manner.

Examples of connecting the film strip 1 to the supports 12 or the holder inserts 15 are shown in Fig. 12 and 13, where locking heads 16 located at the upper end of the supports 14 spring-lock into the holes 2 of the film strip 1, the spring property of the locking heads 16 being achieved, for example, by a cross-shaped division, which is shown schematically in Fig. 13.

Alternatively or additionally, clamps 17, preferably also made of plastic, can be connected in the manner shown on the one hand to the gutter 12 and on the other hand to the foil strip 1 by means of locking heads 16.

Claims (16)

Expectations 1. Perforated foil tape for construction purposes, in particular for the manufacture of ventilation grilles, e.g. for closing elongated ventilation openings on ventilated facades of buildings, characterized in that the film strip {1) to form a fold line (7) on at least one surface (3, 4) is provided with at least one notch (6), 15 which runs in the longitudinal direction (7) of the foil strip {1) and is designed such that a strip (9) of the foil strip (1) along the notch (6) opposite the remaining foil tape can be folded or bent. 2. Film strip according to claim 1, characterized in that the fold line (7) is formed by notches (6) which are aligned opposite one another on the two surfaces (3, 4) of the film strip (1). 3. Film strip according to claim 1 or 2, characterized in that the film strip (1) consists of plastic, in particular of a PVC, PE or PP material. 4. Film strip according to one of the preceding claims, characterized in that the notch (6) has already been formed or embossed during the shaping of the film strip (1). 5. "Film strip according to one of the preceding claims, - 14 - characterized in that the shape and depth of the notch (6) are selected such that the surface stiffness of the film strip (1) is essentially retained and the strip (9) to be bent can nevertheless be easily bent from the rest of the film strip by hand or with the assistance of a tool. 6. Film strip according to claim 5, characterized in that the bent strip (9) remains connected to the remaining foil strip (1). 7. Film strip according to one of the preceding claims, characterized in that the notch (6) is V-shaped or U-shaped. 8. Foil strip according to one of the preceding claims, characterized in that the depth of the notch (6) - in the case of one notch (6) on each of the two surfaces, the depth of both notches (6) together - is approximately 5-60%, preferably 15-25% of the thickness of the foil strip (1), the thickness of the foil strip (1) preferably being in the range of 1-1.5 mm. 9. Film strip according to one of the preceding claims, characterized in that the notch (6) runs in the connecting line of the holes (2) of the film strip (1), in particular in the connecting line of the hole centers in the case of circular holes (2) or in the connecting line of the hole center lines in the case of substantially oval holes (2). 10. Film strip according to one of the preceding claims, characterized in that the notch (6) runs without interruption along the film strip (1) - unless interruptions occur due to the perforation when the notch (6) runs in a row of holes. 11. Foil strip according to one of the preceding claims, characterized in that the foil strip (1) - following a grid dimension - has a plurality of notches (6) running parallel and spaced from one another, preferably along the central axis of each row of holes in the foil strip (1). 12. Film strip according to claim 11, characterized in that the center axes of the rows of holes have a distance of approximately 5-8 mm. 13. Foil strip according to one of the preceding claims, characterized in that the shape of the holes (2) of the foil strip (1) is preferably rounded, namely circular or oval or rectangular with rounded corners. 14. Film strip according to one of the preceding claims, characterized in that the film strip (1) consists of two firmly connected or jointly formed layers of plastic, the color of which - at least on the surface - is different. 15. Foil tape according to one of the preceding claims, characterized in that covering elements for gutters (12) are made from the foil tape (1). 16. Film strip according to claim 15, characterized by holding elements (14, 15, 17) for positioning and holding the cover elements in the gutter (12).