Holding plate for a vacuum cleaner filter bag and vacuum cleaner filter bag comprising a holding plate

Abstract

The invention relates to a holding plate for a vacuum cleaner filter bag, comprising: a base plate having a passage opening, a collar arranged on the base plate and surrounding the passage opening to form a passage channel, and a closing flap for closing the passage channel, the closing flap projecting beyond the outer circumference of the collar when closed. The invention also relates to a vacuum cleaner filter bag comprising a corresponding holding plate.

Description

[0001] The invention relates to a retaining plate for a vacuum cleaner filter bag and to a vacuum cleaner filter bag comprising a retaining plate.

[0002] Vacuum cleaner bags typically have a retaining plate at an opening in the bag, designed to hold the filter bag inside the vacuum cleaner. The opening in the retaining plate is often closable with a flap. During vacuuming, the flap is open, allowing the opening in the retaining plate to remain open. The flap closes when vacuuming is finished.

[0003] Conventional retaining plates are known, for example, from DE 296 15 163, DE 199 48 909, DE 20 2008 004 733 or EP 1 849 392.

[0004] Conventional mounting plates of this type have the disadvantage that dust particles, fibers, or other particles can accumulate around the opening. In particular, coarse dust particles or fibers can also be found at the edge of the opening, preventing it from being closed by the flap. This can lead to the undesirable effect of dust escaping when the vacuum cleaner is not in use.

[0005] To create a filter bag for a vacuum cleaner that optimizes the effective filter area in the area of ​​the retaining plate and avoids obstruction of the closure device even as the filter bag becomes increasingly full, EP 2 772 173 A1 proposes a collar protruding into the interior of the filter bag.

[0006] EP 2 025 278 A1, DE 10 2008 046 200 A1, and DE 10 2007 040 417 A1 disclose vacuum cleaner filter bags. FR 2 721 188 A1 publishes an automatic sealing device for a vacuum cleaner filter bag. US 3,724,179 discloses a self-sealing end closure for a vacuum cleaner filter bag.

[0007] In view of this, the object underlying the invention is to provide a further improved retaining plate for a vacuum cleaner filter bag that enables the opening of the retaining plate to be securely closed by means of the closing flap.

[0008] This problem is solved by a method according to claim 1.

[0009] The invention provides a retaining plate for a vacuum cleaner filter bag, comprising a base plate having a passage opening, a collar arranged on the base plate and surrounding the passage opening, so that a passage channel is formed, and a closing flap for closing the passage channel, wherein the closing flap projects beyond the outer circumference of the collar when closed.

[0010] Because the closure flap, when closed, extends partially or completely beyond the outer circumference of the collar, it prevents further particles from overcoming the closure through any gap that may occur, even if the closure is already blocked by particles. To overcome the closure, these additional particles would first have to navigate around the portion of the closure flap that extends beyond the outer circumference of the collar. Consequently, the passage channel is securely closed, which is equivalent to securely closing a retaining flap opening.

[0011] The opening can be located in one plane of the base plate.

[0012] When closed, the closure flap covers or overlaps the collar. Specifically, the closure flap covers or overlaps the collar in such a way as to prevent the escape of aspirated particles (e.g., dust) via the closure flap. In particular, the closure flap may, when closed, be in contact with the passage channel, for example, partially or completely touching the collar.

[0013] The locking flap may, when closed, contact an edge of the collar that slopes away from the base plate. The locking flap may be connected to the base plate and / or the collar by a hinge. The locking flap may project beyond the outer circumference of the collar in an area where the hinge is not located. The locking flap may project partially or completely beyond the outer circumference of the collar.

[0014] The collar can completely surround the opening. The collar can be cylindrical. The collar can have a base of any shape. Genera of the collar can be perpendicular to the base plate. Alternatively or additionally, genera of the collar can form an angle other than 90° with the plane of the base plate.

[0015] A suitably shaped collar makes it possible to stabilize a suction pipe nozzle inserted into the passage channel.

[0016] The base plate may include a seal. The seal may be designed to seal the mounting plate against an intake manifold nozzle.

[0017] The closure flap can have a flat area.

[0018] A corresponding locking flap allows for a maximum opening compared to a locking flap that does not have a flat area.

[0019] Flat means that the area / closing flap lies essentially in one plane. Flat can mean that the area / closing flap has no protrusions, depressions, and / or bulges. In particular, the closing flap can be completely flat.

[0020] The collar or passage channel can have an inlet opening on one side facing the base plate and an outlet opening on one side facing away from the base plate, wherein the closing flap, when closed, is curved and / or beveled in an area extending beyond the outer circumference of the collar in an area relative to the plane of the outlet opening.

[0021] A corresponding closing flap solves the problem according to the invention of enabling a secure closing of the opening of the retaining plate by means of the closing flap in an improved way, since the further particles must additionally overcome the curved and / or beveled area relative to the plane of the exit opening in order to overcome the closure.

[0022] The inlet opening is located where the collar is attached to the base plate. The outlet opening is at the edge of the collar facing away from the base plate. The inlet and outlet openings correspond to the base and top surfaces of the collar, which is particularly cylindrical.

[0023] The chamfered portion of the closure flap, when closed, can form an angle with the plane of the outlet opening in a range of -120° to +120° (but not -90° or +90°), particularly between -90° and +90° (but not -90° or +90°), particularly from -75° to +75°, and particularly from -60° to +60°. A portion of the closure flap that, when closed, projects beyond the outer circumference of the collar can, when closed, be perpendicular to the plane of the outlet opening, i.e., form an angle of -90° or +90° with the plane of the outlet opening. If the closure flap has a flat area, the chamfered portion can form an edge region of the closure flap. The chamfered portion can surround the flat area.

[0024] The closure flap may be curved and / or beveled relative to the plane of the exit opening in the area of ​​its edge which, when the closure flap is closed, extends beyond the outer circumference of the collar and / or rests on the collar.

[0025] The closure flap may be neither curved nor beveled relative to the plane of the exit opening in an area of ​​its edge which rests on the collar when the closure flap is closed.

[0026] The closure flap can be convex and / or chamfered along at least 50%, in particular at least 70%, and in particular at least 90% of its circumference. In particular, the closure flap can be convex and / or chamfered along its entire circumference. The closure flap can be convex and / or chamfered all the way around.

[0027] In particular, the closure flap may be flat in its center and curved and / or beveled at its edge, especially in an area that, when closed, extends beyond the outer circumference of the collar.

[0028] The closure flap, when closed, can protrude at least partially or completely by at least 1 mm, in particular at least 1.5 mm, in particular at least 2.5 mm and / or a total maximum of 3.5 mm, in particular at most 5 mm, in particular at most 15 mm, beyond the outer circumference of the collar.

[0029] By extending the closure flap further beyond the collar, the inventive effect of enabling secure closure of the opening of the retaining plate by means of the closure flap is enhanced. A maximum extension also ensures the functionality of the closure flap.

[0030] The closing flap can be convex or concave when closed, from the perspective of the opening through which it passes.

[0031] Both options make it possible to enhance the effect according to the invention, since further particles must first overcome the convex or concave geometry in order to overcome the closure as a whole.

[0032] The chamfered portion of the locking flap can form an angle with the generatrix of the collar at the location of the chamfered portion of the locking flap in a range of -30° to +210°, particularly in a range of 0° to +180°, particularly in a range of +15° to +165°, and particularly in a range of +30° to +150°. The generatrix can be perpendicular to the base plate. A portion of the locking flap that projects beyond the outer circumference of the collar when the locking flap is closed can be parallel to the generatrix when the locking flap is closed.

[0033] The collar can be made of the same material as the base plate.

[0034] Using the same material for the base plate and the collar makes it possible to simplify and / or save on manufacturing steps.

[0035] The collar can be made of the same material as the base plate.

[0036] The closure flap can comprise a first area comprising a first material with a first hardness and a second area comprising a second material with a second hardness, wherein the second hardness is less than the first hardness, wherein the second area is located at least partially or completely at the edge of the closure flap, and wherein the second area is located at least partially or completely along the circumference of the closure flap.

[0037] Due to the softer material along the circumference of the closure flap, blocking particles are encased by the soft material, and the closure flap forms a smaller gap than if it were made of the harder material. This enhances the effect according to the invention.

[0038] The second area can include the portion of the closure flap that extends beyond the outer circumference of the collar when closed. Alternatively or additionally, the second area can include a portion of the closure flap that rests on the collar when closed.

[0039] The base plate can consist of the first material and / or comprise it.

[0040] The closure flap can be made of rubber.

[0041] The retaining plate can comprise three materials, in particular a thermoplastic and two different elastomers, in particular thermoplastic elastomers. The retaining plate can consist of one elastomer, in particular a thermoplastic elastomer. The entire retaining plate can be made of rubber.

[0042] Alternatively or additionally, the collar can comprise an elastomer, in particular a thermoplastic elastomer, at its edge in the area of ​​the outlet opening. In particular, the collar can consist of an elastomer, in particular a thermoplastic elastomer, at its edge in the area of ​​the outlet opening.

[0043] The first and / or the second material can be a plastic, in particular wherein the first material is a thermoplastic and / or the second material is an elastomer, in particular a thermoplastic elastomer.

[0044] By choosing the right materials, the effect of the different materials can be easily achieved.

[0045] The second material can have a thickness of less than 2 mm, in particular less than 1 mm, in particular less than 0.9 mm, in particular less than 0.5 mm and / or more than 0.05 mm, in particular more than 0.1 mm, at least partially or completely.

[0046] The second material can have a hardness of at least 25 Shore A, in particular at least 30 Shore A and / or at most 90 Shore A, in particular at most 70 Shore A.

[0047] By selecting the appropriate hardness, the effect described for the different materials is made possible in a special way.

[0048] The first area cannot extend beyond the inner circumference of the collar when the closure flap is closed.

[0049] By limiting the first area with higher hardness to the inner area, it is possible for blocking particles on the edge of the collar to be enclosed by the second area with lower hardness.

[0050] The second area can extend from the inner circumference of the collar to the outside when the closure flap is closed.

[0051] The base plate may include an additional collar that is positioned outside the collar.

[0052] The additional collar makes it possible to attach a filter medium to the mounting plate.

[0053] The closure flap can be connected to the rest of the collar via a hinge.

[0054] The extended collar can enclose the closure flap when closed. The extended collar can form a gap of at least 0.5 mm, in particular at least 1 mm, in particular at least 2 mm, in particular at least 10 mm, partially around the circumference with the closure flap when closed. The extended collar can form a gap of at most 20 mm, in particular at most 15 mm, in particular at most 10 mm, partially around the circumference with the closure flap when closed.

[0055] A minimum-width gap prevents a nozzle effect from occurring during the closing process of the flap when suction power decreases, which would otherwise transport more particles into the sealing area. This enhances the effect according to the invention.

[0056] The gap can form completely around the locking flap.

[0057] Furthermore, the retaining plate can include a spring element, whereby the closing flap is pre-tensioned into the closed state by means of the spring element.

[0058] A suitable spring element makes it possible to provide sufficient force for closing.

[0059] The spring element can be any element that exerts a preload on the locking flap. The spring element can comprise metal, in particular spring steel, and / or plastic and / or rubber. The spring element can be made of metal, in particular spring steel, and / or plastic and / or rubber. The spring element can comprise or be a bending spring, in particular a leaf spring, a torsion spring, and / or a coil spring.

[0060] The base plate can comprise a first plate-shaped part and a second plate-shaped part, wherein the collar and the closure flap are arranged on the first plate-shaped part, wherein the further collar is arranged on the second plate-shaped part, and wherein the first plate-shaped part is attached to the second plate-shaped part.

[0061] A suitable composition makes it possible to realize a geometry with two collars, for example, through injection molding processes.

[0062] In particular, the first plate-shaped part can be bonded and / or welded to the second plate-shaped part. The first plate-shaped part and / or the second plate-shaped part can include a seal. The seal can be designed to seal the retaining plate against an intake manifold connection.

[0063] The invention also provides a vacuum cleaner filter bag comprising one of the previously described retaining plates.

[0064] The vacuum cleaner filter bag can include a filter medium that is attached to the base plate, the collar, and / or the further collar of the retaining plate. The filter medium can form a bag. The filter medium can form the dust collection bag. The filter medium can be glued and / or welded to the collar, the base plate, and / or the further collar.

[0065] The collar can protrude into the interior of the vacuum cleaner filter bag. The edge of the collar, which lies in the plane of the outlet opening, can be partially or completely inside the filter bag relative to the base plate.

[0066] The present invention is explained in more detail with reference to the following exemplary figures. These show: Fig. 1a - schematic embodiments of a vacuum cleaner filter bag in the area of ​​its retaining plate in a cross-sectional view, Fig. 2 - schematic further embodiment of a vacuum cleaner filter bag in the area of ​​its retaining plate in a cross-sectional view, Fig. 3 - schematic further embodiment of a vacuum cleaner filter bag in the area of ​​its retaining plate in a perspective view.

[0067] Fig. 1a bis 1c Figure 1 illustrates the schematic structure of three different embodiments of a vacuum cleaner filter bag 1 comprising a retaining plate 2, wherein a closing flap 3 of each of the three embodiments has a flat area 4.

[0068] Fig. 1a Figure 1 shows a filter medium 5 that forms the vacuum cleaner filter bag 1. The filter medium 5 is attached to a base plate 6 over its entire surface, for example by welding or gluing.

[0069] The base plate 6 has a through-opening 7, which can be circular, elliptical, rectangular, or have another shape. During operation of the vacuum cleaner, suction air laden with particles enters the interior 10 of the vacuum cleaner filter bag 1 through a suction tube nozzle (not shown in the figure), which is inserted into the through-opening 7 from the direction of the outer 9 and seals against the through-opening 7, for example, by means of a seal 8 designed as a sealing lip, which, for example, extends completely around the through-opening 7.

[0070] A collar 11 is arranged on the base plate 6, surrounding the opening 7 on the side of the base plate 6 facing the inside of the bag and forming a passage channel 12. The collar 11 typically has the outline of the opening 7. However, the collar 11 can also have an alternative outline, for example, be circular if the opening 7 is elliptical. The collar 11, or passage channel 12, has an inlet opening 13 on one side facing the base plate 6. A closure flap 3 is attached to the collar 11 at its inner edge 14 (in the so-called plane of the outlet opening 15 of the collar 11), for example, by means of a hinge 16 on the edge 14 of the collar 11.

[0071] The closing flap 3 is pre-tensioned by a spring element 17, in particular a coil spring, and is designed to close the passage channel 12. In this embodiment, the closing flap 3 is designed as a flat plate. The closing flap is made, for example, of plastic, in particular polypropylene (PP). In the closed state, the closing flap projects beyond the outer circumference of the collar 11. In the illustrated embodiment, the closing flap 3 projects beyond the outer circumference of the collar 11 in the areas where the hinge 16 is not located.

[0072] Fig. 1a Figure 18 shows a state of the retaining plate 2 in which the closure flap 3 is prevented from closing by a particle 18. The particle 18 is wedged between the edge 14 of the collar 11 and the closure flap 3, blocking the closure flap 3. Because the closure flap 3 would protrude beyond the circumference of the collar 11 even when closed, it is made more difficult for further particles from inside the bag to escape from the vacuum cleaner filter bag 1 through the gap held open by the blocking particle 18. An example path of a particle from inside 10 of the vacuum cleaner filter bag 1 to the outside is indicated by arrow 19. This minimizes the risk of particles escaping from inside 10 of the vacuum cleaner filter bag 1.

[0073] The base plate 6, the collar 11, and the closure flap 3 are preferably made of plastic, for example, polypropylene (PP). The hinge 16 is, for example, designed as a film hinge. The sealing lip is, for example, made of a flexible material, in particular a thermoplastic elastomer (TPE). The retaining plate 2, comprising the base plate 6, the sealing lip, the collar 11, the film hinge, and the closure flap 3, can be manufactured by a two-component injection molding process.

[0074] The filter medium 5 can comprise a nonwoven fabric. The filter medium 5 can be multilayered. The filter medium 5 can have a multilayer structure of nonwoven fabrics, in particular it can comprise a structure of a spunbond, a meltblown and another spunbond – in that order. The filter medium 5 can have a layered structure according to EP 2 004 303 A2.

[0075] Fig. 1b Figure 1 shows a filter medium 5, a base plate 6, a passage opening 7, a sealing lip, a collar 11, a passage channel 12, an inlet opening 13, an outlet opening 15, a hinge 16 and a particle 18, which are arranged as shown in Figure 1. Fig. 1a are described and trained. Therefore, reference is made to the explanations regarding Fig. 1a Reference is made to corresponding characteristics. As in Fig. 1a The closing flap 3 is described as being pre-tensioned by a spring element 17, in particular a coil spring.

[0076] A locking flap 3 of the Fig. 1b In its closed state, the flap 3 is chamfered in an area of ​​its edge 22, where the hinge 16 is not located, relative to the plane of the outlet opening 15. This results in the closing flap 3 being concave when closed, as viewed from the opening 7. As indicated by arrow 19, this geometry also prevents further particles from the interior 10 of the vacuum cleaner filter bag 1 from escaping through the gap held open by the blocking particle 18.

[0077] Furthermore, the closure flap 3 comprises a first region 20 made of a first material, for example, a thermoplastic, in particular polypropylene (PP), and a second region 21 made of a second material, for example, an elastomer, in particular a thermoplastic elastomer (TPE). The second region 21 is formed at the edge 22 of the closure flap 3 around the first region 20 inside the closure flap 3. The second region 21 has a lower hardness than the first region 20, resulting in easier deformation and lower resistance to indentation. This allows the blocking particle 18 to press into the second material under spring preload, and the second region 21 to at least partially close around the particle 18. Consequently, despite the blocking particle 18, a largely complete closure of the closure flap 3 can be achieved.

[0078] Fig. 1c Figure 1 shows a filter medium 5, a base plate 6, a through-opening 7, a sealing lip, a collar 11, a through-channel 12, an inlet opening 13, an outlet opening 15, a hinge 16, a closure flap 3 and a particle 18, which are partly like the corresponding elements of the Figuren 1a und 1b are trained. As in Fig. 1a The closing flap 3 is described as being pre-tensioned by a spring element 17, in particular a coil spring.

[0079] In contrast to the Figuren 1a und 1b is the base plate 6 of the embodiment of the Fig. 1c The assembly is formed in multiple parts and comprises a first plate-shaped part 23 and a second plate-shaped part 24, which are welded or bonded together. The first plate-shaped part 23 can be formed like the base plate 6 of the Figuren 1a und 1b be formed or thinner than the base plate 6 of the Figuren 1a und 1b The second plate-shaped part 24 has a further collar 25 to which the filter medium 5 can be attached.

[0080] Furthermore, differing from the embodiments of the Figuren 1a und 1b The closing flap 3 is convex from the perspective of the passage opening 7. In its closed state, the closing flap 3 is chamfered in a region of its edge 22, where the hinge 16 is not located, relative to the plane of the exit opening 15.

[0081] By appropriately selecting the distance between collar 11 and the second collar 25, it can be ensured that even if particle 18 blocks the seal, only a few additional particles will be able to overcome the gap between collar 11 and the second collar 25, as well as the gap between the closure flap 3 and collar 11, to exit the vacuum cleaner filter bag 1. A corresponding path for a particle is indicated by arrow 19. It should be noted that if the gap between collar 11 and the second collar 25 is too small, a nozzle effect may develop when the closure flap 3 is closed and the suction flow decreases, attracting further particles into the gap between the closure flap 3 and collar 11.

[0082] Fig. 1d bis 1g illustrate the schematic structure of a vacuum cleaner filter bag 1 according to four variations of the embodiment of Fig. 1b .

[0083] Fig. 1d Figure 1 shows a filter medium 5, a base plate 6, a passage opening 7, a sealing lip, a collar 11, a passage channel 12, an inlet opening 13, an outlet opening 15, a spring element 17, a particle 18 and a path of a particle 19, which are largely like the corresponding elements of the Fig. 1b are trained. Therefore, reference is made to the explanations regarding Fig. 1b Reference is made to corresponding characteristics.

[0084] As opposed to Fig. 1b shows Fig. 1d One embodiment in which a hinge 16 is arranged on the left side of the illustration at the transition from the base plate 6 to the collar 11. The closure flap 3 then has a predominantly vertically extending area that connects a flat area 4 with the hinge 16.

[0085] Furthermore, a first area 20 of the closure flap of the embodiment of the Fig. 1d arranged over a second area 21 of the closure flap. The first area 20 is made of a thermoplastic (in Fig. 1d (not shown hatched) and the second area 21 made of an elastomer (in Fig. 1d (shown hatched), in particular thermoplastic elastomer. In this embodiment, the closure flap 3 is chamfered completely around its edge 22 relative to the plane of the outlet opening 15.

[0086] Fig. 1e shows a variation of the embodiment of Fig. 1d , wherein the hinge 16 is formed on the base plate 6. Otherwise, the embodiment of the Fig. 1e according to the embodiment of the Fig. 1d trained. Therefore, reference is made to the explanations regarding Fig. 1d Reference is made to corresponding characteristics.

[0087] Fig. 1f shows a variation of the embodiment of Fig. 1d , wherein the hinge 16 is attached to a further collar 25 according to Fig. 1c is trained. As in Fig. 1c A filter medium 5 is attached to the further collar 25, but the hinge 16 is in Fig. 1f on the left side at the further collar 25. The base plate 6 is also as in Fig. 1c It is designed in multiple parts. Otherwise, the embodiment of Fig. 1f according to the Fig. 1d trained. Therefore, reference is made to the explanations regarding Fig. 1d Reference is made to corresponding characteristics.

[0088] Fig. 1g shows a variation of the embodiment of Fig. 1d , with the hinge 16 shown on the right side. Furthermore, the collar 11 has a circumferential area of ​​thermoplastic elastomer at its edge 14 (in the Fig. 1g (shown hatched). As in the Fig. 1g This is made possible by the fact that the edge 14 of the collar 11 yields to a blocking particle, the particle becomes trapped, and further particles are prevented from moving towards the outer part 9 of the vacuum cleaner filter bag. Otherwise, the embodiment of the Fig. 1g according to the Fig. 1d trained. Therefore, reference is made to the explanations regarding Fig. 1d Reference is made to corresponding characteristics.

[0089] Fig. 1h und 1i illustrate the schematic structure of a vacuum cleaner filter bag according to two variations of the embodiment of Fig. 1a .

[0090] Fig. 1h Figure 1 shows a filter medium 5, a base plate 6, a through-opening 7, a sealing lip, a collar 11, a through-channel 12, an inlet opening 13, an edge 14 of the collar 11, an outlet opening 15, a hinge 16, a spring element 17, which according to Fig. 1a are trained. Therefore, reference is made to the explanations regarding Fig. 1a Reference is made to corresponding characteristics.

[0091] A closure flap 3 of the embodiment of the Fig. 1h is according to the embodiment of the Fig. 1b in an area of ​​its edge 22 where the hinge 16 is not located, beveled relative to the plane of the exit opening 15.

[0092] When the closure flap 3 is closed, the beveled area forms an angle α with the plane of the outlet opening 15. For example, the angle α is according to Fig. 1h approximately -45°.

[0093] Furthermore, the beveled area of ​​the closure flap 3, when closed, forms an angle β with a generatrix of the collar 11 at the point of the beveled area of ​​the closure flap 3. For example, the angle β is according to Fig. 1h approximately +45°.

[0094] Fig. 1i shows an alternative embodiment of the Fig. 1h , wherein the filter medium 5 is attached to the collar 11, in particular by welding or bonding. Furthermore, the beveled area, when the closure flap 3 is closed, forms an angle α of approximately -120° with the plane of the outlet opening 15. In addition, when the closure flap 3 is closed, the beveled area forms an angle β of approximately -30° with a generatrix of the collar 11 at the location of the beveled area of ​​the closure flap 3. Otherwise, the embodiment of Fig. 1i according to the Fig. 1h trained. Therefore, reference is made to the explanations regarding Fig. 1h Reference is made to corresponding characteristics.

[0095] Fig. 2 shows a variation of the embodiment of Fig. 1a , wherein the closure flap 3 does not have a flat area, but is conically tapered. Reference is made to corresponding elements by corresponding reference numerals. In this geometry, too, the closure flap 3 projects partially beyond the outer circumference of the collar 11 when closed. This differing geometry also prevents particles from escaping from the vacuum cleaner filter bag 1, even in the case of a blocking particle 18, for example along the path shown by arrow 19. Otherwise, the embodiment of the Fig. 2 how the embodiment of Fig. 1a trained. As in Fig. 1a The locking flap 3 is pre-tensioned by a spring element 17.

[0096] Fig. 3 shows another variation of the embodiment of Fig. 1a in a half-open state of the closure flap 3, wherein the base plate 6 is multi-part and has a further collar 25 as according to the embodiment of the Fig. 1c The filter material 5 is attached to the further collar 25. In this case, the filter material has been cut open and widened to show a view of the retaining plate 2 from inside 10 of the vacuum cleaner filter bag 1. A spring is also shown as an example of a spring element 17, which pre-tensions the closing flap 3.

[0097] The described embodiments can be combined with one another in any way. For example, each of the described geometries of the closure flap 3 is applicable to each of the described embodiments. Furthermore, the choice of materials according to the embodiments of the Figuren 1a, 1b , 1d bis 1g applicable to all other embodiments accordingly. Furthermore, the design of the base plate 6 (one-piece as in Fig. 1a or comprising a first plate-shaped part 23 and a second plate-shaped part 24 as in Fig. 1c ) implementable in each of the embodiments. Bezugszeichenliste:

[0098] 1 Vacuum cleaner filter bag 2 Retaining plate 3 Closure flap 4 Flat area 5 Filter medium 6 Base plate 7 Passage opening 8 Seal 9 Outer part of the vacuum cleaner filter bag 10 Inner part of the vacuum cleaner filter bag 11 Collar 12 Passage channel 13 Inlet opening 14 Edge of the collar 15 Outlet opening 16 Hinge 17 Spring element 18 Particle 19 Path of a particle 20 First area 21 Second area 22 Edge of the closure flap 23 First plate-shaped part 24 Second plate-shaped part 25 Further collar

Claims

1. Retaining plate (2) for a vacuum cleaner filter bag (1) comprising: a base plate (6) having a passage opening (7), a collar (11) arranged on the base plate and surrounding the passage opening, forming a passage channel (12), and a closing flap (3) for closing the passage channel, the closing flap projecting beyond the outer circumference of the collar when closed.

2. Retaining plate according to claim 1, wherein the closure flap has a flat area (4).

3. Retaining plate according to one of the preceding claims, wherein the passage channel has an inlet opening (13) on a side facing the base plate and an outlet opening (15) on a side facing away from the base plate, wherein the closing flap is curved and / or chamfered in the closed state in an area extending beyond the outer circumference of the collar relative to the plane of the outlet opening.

4. Retaining plate according to one of the preceding claims, wherein the closing flap, in the closed state, projects at least partially or completely beyond the outer circumference of the collar by at least 1 mm, in particular at least 1.5 mm, in particular at least 2.5 mm and / or a total maximum of 3.5 mm, in particular at most 5 mm, in particular at most 15 mm.

5. Retaining plate according to one of the preceding claims, wherein the closure flap is convex or concave in the closed state from the perspective of the passage opening.

6. Retaining plate according to one of the preceding claims, wherein the collar comprises the same material as the base plate.

7. Retaining plate according to one of the preceding claims, wherein the closure flap comprises a first region (20) comprising a first material with a first hardness and a second region (21) comprising a second material with a second hardness, wherein the second hardness is less than the first hardness, wherein the second region is arranged at least partially or completely at the edge of the closure flap (22), wherein the second region is arranged at least partially or completely along the circumference of the closure flap.

8. Retaining plate according to claim 7, wherein the first and / or the second material is a plastic, in particular wherein the first material is a thermoplastic and / or the second material is an elastomer, in particular a thermoplastic elastomer.

9. Retaining plate according to one of claims 7 and / or 8, wherein the second material has a hardness of at least 25 Shore A, in particular at least 30 Shore A and / or at most 90 Shore A, in particular at most 70 Shore A.

10. Retaining plate according to one of claims 7 to 9, wherein the first area does not extend beyond an inner circumference of the collar when the closure flap is closed.

11. Retaining plate according to one of the preceding claims, wherein the base plate comprises a further collar (25) which is arranged outside the collar.

12. Retaining plate according to claim 11, wherein the further collar surrounds the closure flap in the closed state and forms a gap of at least 0.5 mm, in particular at least 1 mm, in particular at least 2 mm, in particular at least 5 mm, partially circumferentially with the closure flap in the closed state.

13. Retaining plate according to one of the preceding claims, further comprising a spring element (17), wherein the closure flap is pre-tensioned to the closed state by means of the spring element.

14. Retaining plate according to one of claims 11 to 13 wherein the base plate comprises a first plate-shaped part (23) and a second plate-shaped part (24), wherein the collar and the closure flap are arranged on the first plate-shaped part, wherein the further collar is arranged on the second plate-shaped part, wherein the first plate-shaped part is attached to the second plate-shaped part.

15. Vacuum cleaner filter bag (1) comprising a retaining plate according to one of the preceding claims.

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