Vacuum cleaner ventilation grid, vacuum cleaner, and method for producing a vacuum cleaner ventilation grid

Abstract

The invention relates to a vacuum cleaner ventilation grille comprising: - an injection-molded part (1) with a plurality of grid-like arranged grid holes (11), and - a perforated film (2) with a plurality of film holes (21), wherein the perforated film (2) is attached to the injection-molded part (1) such that the grid holes (11) and the film holes (12) are offset from one another and / or the film holes (21) are at least one dimension smaller than the grid holes (11). The invention further relates to a vacuum cleaner having such a vacuum cleaner ventilation grille, and to a corresponding method for manufacturing the vacuum cleaner ventilation grille.

Description

[0001] The invention relates to a vacuum cleaner ventilation grille, a vacuum cleaner, and a method for manufacturing a vacuum cleaner ventilation grille. The vacuum cleaner ventilation grille is advantageously designed with a delicate profile to allow the exhaust air from the vacuum cleaner flowing through it to escape efficiently. It is also advantageously designed to direct the exhaust air out at a specific angle. Due to its size, undercuts and contours that effectively direct the airflow are not readily achievable in a vacuum cleaner ventilation grille manufactured as an injection-molded part. However, injection-molded parts are inexpensive and quick to produce.

[0002] DE 10 2018 251 706 A1 discloses a working device with a housing that has several air inlets through which cooling air can be supplied to the engine, wherein a sound-absorbing absorption element is arranged along an air supply path of the cooling air behind the air inlets.

[0003] The invention thus addresses the problem of providing a vacuum cleaner ventilation grille, a vacuum cleaner, and a method for manufacturing the vacuum cleaner ventilation grille, all of which are cost-effective and quick to implement. During operation, exhaust air should flow out of the vacuum cleaner ventilation grille in an advantageous manner.

[0004] According to the invention, this problem is solved by a vacuum cleaner ventilation grille with the features of claim 1, a vacuum cleaner with the features of claim 7, and a method for manufacturing a vacuum cleaner ventilation grille with the features of claim 8. Advantageous embodiments and further developments of the invention are described in the following dependent claims.

[0005] The advantages achievable with the invention include, besides a smaller footprint for the vacuum cleaner ventilation grille, more effective airflow redirection through the grille, relatively low manufacturing costs, and satisfactory cost-effectiveness. Both the injection-molded part and the perforated film can be produced quickly and inexpensively.

[0006] The invention is based on the fundamental idea of ​​producing an injection-molded part in an injection mold with a contour without undercuts, which causes only a relatively small deflection when the exhaust air is blown through the contour. This deflection is increased by attaching the perforated film to the injection-molded part. The perforated film is attached to the injection-molded part, with the film holes being slightly offset from the grid holes when in contact. Preferably, the film holes are also smaller, and in particular narrower, than the grid holes. This creates a tear-off edge at the upper edge of the overlapping holes, where the oncoming exhaust air becomes turbulent. A channel is formed by the hole contours and the turbulent areas, through which the exhaust air flows in the direction of the deflection. Such a contour cannot be reproduced in an injection mold.Using the solution according to the invention, the airflow can be deflected by contours that include undercuts. This makes the deflection significantly more effective in a small installation space. The function of the deflection of the vacuum cleaner ventilation grille arranged in the vacuum cleaner is to expel the exhaust air from the vacuum cleaner without disturbing or blowing on the user and without stirring up or blowing away dust from the floor.

[0007] The invention relates to a vacuum cleaner ventilation grille, comprising an injection-molded part with a multitude of grid-like arranged grid holes, and a perforated film with a multitude of film holes, wherein the perforated film is attached to the injection-molded part, such that the grid holes and the film holes are offset from each other, wherein the film holes are preferably smaller than the grid holes in at least one dimension.

[0008] Because the foil holes are offset further downwards relative to the grille holes, and are also smaller according to a preferred embodiment, the deflection is very effective. Preferably, the foil holes are offset downwards relative to the grille holes. Position and direction specifications refer to the standard operating position of the vacuum cleaner, into which the vacuum cleaner ventilation grille is or is to be inserted.

[0009] In a preferred embodiment, the injection-molded part has an inner surface intended for placement inside a vacuum cleaner and an outer surface that forms at least part of the outer surface of the vacuum cleaner. The perforated film is preferably attached to the inner surface of the injection-molded part. This protects the perforated film from external influences during operation of the vacuum cleaner.

[0010] In a preferred embodiment, the inner surface is concave, and the perforated film is inserted into this concave surface. Preferably, the perforated film is attached to the injection-molded part by means of snap-in elements and / or adhesives. This ensures the coordinated functionality of both components.

[0011] Preferably, both the injection-molded part and the perforated film are made of plastic. This makes both components cost-effective. The injection-molded part is preferably made of polypropylene. Polypropylene is relatively lightweight, durable, and heat-resistant. The perforated film is preferably made of acrylonitrile butadiene styrene (ABS) or polycarbonate. ABS is relatively hard, strong, and heat-resistant. Polycarbonate is relatively lightweight, heat-resistant, and strong. Preferably, the perforated film is transparent. This makes it inconspicuous when viewed from the outside of the injection-molded part.

[0012] In a preferred embodiment, the multitude of grid-like arranged holes have a predetermined shape. The predetermined shape is preferably configured such that four grid holes form a cloverleaf structure. Therefore, the injection-molded part is preferably covered with a grid of cloverleaf patterns, each featuring four grid holes forming a cloverleaf structure. The number of grid holes and the number of film holes can be the same or different. Preferably, the number of grid holes can be greater than the number of film holes, thereby further increasing the flexibility of the injection-molded part.

[0013] Preferably, the injection-molded part is free of undercuts. This makes it easy to manufacture.

[0014] The invention further relates to a vacuum cleaner which has a vacuum cleaner ventilation grille according to one or more of the embodiments described above.

[0015] Preferably, the vacuum cleaner ventilation grille is arranged on one side of the vacuum cleaner. Preferably, the vacuum cleaner has several, e.g., two, ventilation grilles arranged on the left and right sides of the vacuum cleaner, relative to a typical operating position of the vacuum cleaner.

[0016] The vacuum cleaner's ventilation grille is integrated into the vacuum cleaner in such a way that its inner surface is located inside the vacuum cleaner, while its outer surface forms part of the vacuum cleaner's exterior. The vacuum cleaner's housing is designed to accommodate the ventilation grille.

[0017] Furthermore, the invention relates to a method for manufacturing a vacuum cleaner ventilation grille, comprising the following steps Injection molding of an injection-molded part with a plurality of grid-like arranged grid holes, forming holes in a film to produce a perforated film with a plurality of film holes, attaching the perforated film to the injection-molded part so that the grid holes and the film holes are offset from each other, wherein the film holes are preferably formed to be smaller than the grid holes in at least one dimension.

[0018] In a preferred embodiment, holes are formed in a film by punching or laser cutting. This makes the step simple, fast, and cost-effective. For this purpose, the film is unrolled, for example, from a roll and then provided with the holes.

[0019] Preferably, the perforated film is attached to the injection-molded part using snap-fit ​​elements and / or adhesives. This ensures a durable and relatively slip-resistant bond between the injection-molded part and the perforated film.

[0020] An embodiment of the invention is shown schematically in the drawings and is described in more detail below. It is shown schematically and not to scale. Fig. 1 a perspective view of an injection-molded part; Fig. 2 a perspective view of a perforated film; Fig. 3 a step of a method according to the invention; Fig. 4 a detail view of the in Fig. 3 shown step; Fig. 5 a perspective view of a vacuum cleaner ventilation grille according to the invention; Fig. 6 a further perspective view of the in Fig. 5 vacuum cleaner ventilation grille shown; Fig. 7 a partial cross-sectional view of the in Fig. 5 vacuum cleaner ventilation grille shown; Fig. 8 another partial cross-sectional view of the in Fig. 5 shown vacuum cleaner ventilation grille; and Fig. 9 a perspective view of a vacuum cleaner according to the invention.

[0021] Fig. 1 Figure 1 shows a perspective view of an injection-molded part. The injection-molded part 1 has an outer surface (not shown) which is intended to serve as at least part of an outer surface in a vacuum cleaner, and an inner surface 12 which is intended to be arranged inside the vacuum cleaner. Fig. 1 Figure 1 shows a view of the inner surface 12. The injection-molded part 1 has a plurality of grid-like lattice-shaped holes 11, arranged in a cloverleaf pattern, with four lattice-shaped holes 11 forming each cloverleaf structure. Furthermore, the injection-molded part 1 has locking elements 14 that project from the inner surface 12.

[0022] Fig. 2 Figure 1 shows a perspective view of a perforated foil. The perforated foil 2 has a large number of foil holes 21. Furthermore, the perforated foil 2 has additional residual elements 22 in the form of openings, which are designed with the in Fig. 1 The shown locking elements are used to create a fastening.

[0023] Fig. 3 shows one step of a method according to the invention. An injection-molded part 1, which corresponds to the one in Fig. 1 The injection-molded part shown corresponds to a perforated film 2, which is shown in Fig. 2 The perforated foil shown is provided. The perforated foil 2 is attached to the inside 12 of the injection-molded part 1 by placing it in the direction of the arrows, so that the grid holes 11 and the foil holes 12 are offset from each other and the foil holes 12 are preferably at least one dimension smaller than the grid holes 11. The fastening is achieved by means of the snap-fit ​​elements 14 and further snap-fit ​​elements 22 and, if necessary, adhesive bonding.

[0024] Fig. 4 shows a detailed view of the in Fig. 3 The step shown. The injection-molded part 1 has a plurality of grid holes 11, four of which are shown. Four perforated films 21 are arranged offset from the grid holes 11, as indicated by arrows.

[0025] Fig. 5 Figure 1 shows a perspective view of a vacuum cleaner ventilation grille according to the invention. The vacuum cleaner ventilation grille features the [missing information]. Fig. 1 shown injection molded part 1 and the one in Fig. 2 The perforated foil shown is attached to an inside (not shown) of the injection-molded part 1, but is not visible because it is transparent. Fig. 5 Figure 1 shows a view of the outside 13 of the injection molded part 1.

[0026] Fig. 6 shows another perspective view of the in Fig. 5 shown vacuum cleaner ventilation grille. In Fig.5 Figure 1 shows a view of the perforated foil 2, which is attached to the inside 12 of the injection-molded part 1 by means of its snap-in elements 14. The snap-in elements 14 extend through the further snap-in elements 22 and are designed to project forward.

[0027] Fig. 7 shows a partial cross-sectional view of the in Fig. 5 The vacuum cleaner ventilation grille shown. The perforated film 2 has the film holes 21, one of which is shown, and the injection-molded part 1 has the grille holes 1, one of which is shown. The perforated film is attached to the inside 12 of the injection-molded part 1, so that the grille holes 11 and the film holes 12 are offset from each other. The film holes 21 are offset downwards relative to the grille holes 11. In addition, the film holes 21 are smaller than the grille holes 11 in at least one dimension.

[0028] Fig. 8 shows another partial cross-sectional view of the in Fig. 5 shown vacuum cleaner ventilation grille. The one in Fig. 7 The view shown corresponds to the one in Fig. 7 The view shown differs in that the exhaust air flowing through the vacuum cleaner ventilation grille is indicated by arrows. Because the foil holes 21 are narrower than the grille holes 11 and slightly offset when in contact, a separation edge (not shown) forms at one upper edge of the overlapping holes 11, 21, where the incoming exhaust air becomes turbulent. A channel is formed by the hole contours and the turbulent areas, through which the exhaust air flows in the direction of the deflection.

[0029] Fig. 9 Figure 1 shows a perspective view of a vacuum cleaner according to the invention. The vacuum cleaner features the [component / element] shown in Figure 2. Fig. 4 The vacuum cleaner ventilation grille shown is mounted so that it and its outer surface 13 are integrated into a vacuum cleaner housing 3. One such vacuum cleaner ventilation grille is arranged on the left and right sides of the vacuum cleaner. Reference symbol list

[0030] 1 Injection molded part 11 Grid holes 12 Inside 13 Outside 14 Locking element 2 Perforated film 21 Film holes 22 Further locking element 3 Vacuum cleaner housing

Claims

1. Vacuum cleaner ventilation grille, comprising - an injection-moulded part (1) having a multiplicity of grille holes (11) arranged in a grid shape, and - a perforated film (2) having a multiplicity of film holes (21), characterised in that the perforated film (2) is fastened to the injection-moulded part (1) such that the grille holes (11) and the film holes (12) are offset from each other.

2. Vacuum cleaner ventilation grille according to claim 1, characterised in that the injection-moulded part (1) has an inner face (12) which is intended for arrangement in the interior of a vacuum cleaner, and an outer face (13) which is provided as at least part of an outer face in the vacuum cleaner, the perforated film (2) being fastened to the inner face (12) of the injection-moulded part (1).

3. Vacuum cleaner ventilation grille according to claim 1 or 2, characterised in that the inner face (12) is concave and the perforated film (2) is inserted into the concave inner face (12) and is fastened there by means of locking elements (14) and / or adhesive.

4. Vacuum cleaner ventilation grille according to any of the preceding claims, characterised in that the injection-moulded part (1) and the perforated film (2) are each made of plastics material, the injection-moulded part preferably being made of polypropylene and / or the perforated film (2) preferably being made of acrylic butadiene styrene or polycarbonate.

5. Vacuum cleaner ventilation grille according to any of the preceding claims, characterised in that in each case four grille holes (11) of the multiplicity of grille holes (11) arranged in a grid shape form a cloverleaf structure.

6. Vacuum cleaner ventilation grille according to any of the preceding claims, characterised in that the injection-moulded part (1) is devoid of undercuts.

7. Vacuum cleaner, comprising a vacuum cleaner ventilation grille according to any of the preceding claims.

8. Method for producing a vacuum cleaner ventilation grille, comprising the following steps: - injection-moulding an injection-moulded part (1) having a multiplicity of grille holes (11) arranged in a grid shape, - forming holes in a film to produce a perforated film (2) having a multiplicity of film holes (21), characterised by - fastening the perforated film (2) to the injection-moulded part (1) such that the grille holes (11) and the film holes (12) are offset from each other.

9. Method according to claim 8, characterised in that holes are formed in a film by punching or lasering the film.

10. Method according to claim 8 or 9, characterised in that the perforated film (2) is fastened to an inner face (12) of the injection-moulded part (1) by means of locking elements (14) and / or adhesive, the inner face (12) being intended for arrangement in the interior of a vacuum cleaner.

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