EP3066969A1 - Dust filter bag for use in a vacuum cleaner - Google Patents

Abstract

Described is a dust filter bag (1) for use in a vacuum cleaner, comprising a bag (11) of filter material, a holding plate (12) and a closure flap (13) on the holding plate (12) via a hinge (13f) about a hinge axis is mounted so pivotally. The closure flap (13) is acted upon by a spring (14) in the closed position by the spring having a first end on the closure flap (13) and with a second end on the holding plate (12) is supported. It is essential that the spring is designed as a helical spring (14) with a longitudinal axis extending coaxially to the helical coils of the helical spring (14) and the support and arrangement of the helical spring (14) is designed such that upon pivoting the closing flap (13) the helical spring (14) is loaded about a bending axis (14b) which is arranged at an angle, preferably at a right angle to the longitudinal axis of the helical spring (14).

Description

The invention relates to a dust filter bag according to the preamble of claim 1 and a method for producing a dust filter bag.

In the DE 44 153 50 A1 a dust filter bag is described with a holding plate in which the holding plate is formed with a closure flap which has a band-like spring element which holds the closure flap in a position closing the opening of the dust filter bag.

According to the spring characteristic of the band-shaped spring element, the spring force increases in proportion to the opening angle of the closure flap. Since the closure flap is in the open position when the dust filter bag is inserted into the vacuum cleaner, large forces occur which cause plastic deformation in the bearing of the spring element. Consequently, the shutter does not close completely when removing the dust filter bag from the vacuum cleaner.

In the DE 19 948 909 A1 is described a retaining plate with flap for a dust filter bag, wherein the flap is held by a leaf spring in a closed position. The leaf spring has a crown, ie it is formed with a curvature which is at an angle of 90 ° to the longitudinal axis. To open the flap, a relatively high force must be applied. In order to be able to absorb the counterforce when opening, the retaining plate must be designed to be very stable in order to prevent deflection of the retaining plate when the closure flap is opened.

In the EP 1 849 392 A1 a retaining plate is described with a flap in which a band spring is strongly biased in the closed position. In order not to let the force rise too much when opening the shutter, the bending angle of the band spring is limited by the fact that the end of the band spring dips into a recess at a certain opening angle of the shutter, so that a further increase in the bending force is avoided. This structure is relatively expensive, and the band spring must be strongly biased, which is reduced by plastic deformation in the field of force application of the spring forces in the retaining plate, the extent that a secure closing of the flap is no longer guaranteed.

In the DE202013100862 U1 a retaining plate is described with a flap in which different variants of spring elements are used. All have in common that the bending axis of the spring element is aligned at an angle to the axis of rotation of the closure flap. In addition to leaf springs and bar springs and so-called leg springs are provided. All variants described have in common that they are relatively expensive to manufacture.

Object of the present invention is to provide a dust filter bag, which avoids at least a portion of the disadvantages mentioned and is inexpensive to produce.

• einen Beutel aus Filtermaterial mit einer Beuteleinlassöffnung;
• eine Halteplatte mit einer Halteplatteneinlassöffnung;
• eine Verschlussklappe, die an der Halteplatte über ein Scharnier um eine Scharnierachse derart schwenkbar gelagert ist, dass die Verschlussklappe in einer Geschlossenstellung die Halteplatteneinlassöffnung verschließt und in einer Offenstellung die Halteplatteneinlassöffnung freigibt;
• wobei die Halteplatte im Bereich der Beuteleinlassöffnung auf der Außenseite des Beutels derart angeordnet ist, dass die Beuteleinlassöffnung mit der Halteplatteneinlassöffnung fluchtet;
• wobei die Verschlussklappe durch eine Feder in die Geschlossenstellung beaufschlagt ist, indem die Feder mit einem ersten Ende an der Verschlussklappe und mit einem zweiten Ende an der Halteplatte abgestützt ist.

According to the invention, this object is achieved with the subject matter of claim 1. This solution is a dust filter bag for use in a vacuum cleaner. The dust filter bag includes:

• a bag of filter material having a bag inlet opening;
• a holding plate having a holding plate inlet opening;
• a shutter which is pivotably supported on the support plate via a hinge about a hinge axis such that the shutter in a closed position closes the support plate inlet opening and, in an open position, releases the support plate inlet opening;
• wherein the holding plate is arranged in the region of the bag inlet opening on the outside of the bag such that the bag inlet opening is aligned with the holding plate inlet opening;
• wherein the closure flap is urged by a spring in the closed position by the spring having a first end supported on the closure flap and with a second end on the holding plate.

Essential in the inventive solution is that the spring is designed as a helical spring and that the helical spring is formed with a longitudinal axis extending coaxially to the helical turns of the helical spring.

The coil spring has in its extension along the longitudinal axis on a first longitudinal portion which is supported on the holding plate and it has a second longitudinal portion which is supported on the closure flap.

The support and arrangement of the helical spring is designed such that upon pivoting of the closure flap, the helical spring is loaded about a bending axis, which is arranged at an angle, preferably at a right angle to the longitudinal axis of the helical spring.

The proposed dust filter bag may have the advantage that the spring characteristic of the coil spring loaded about its bending axis, which is arranged at an angle to the longitudinal axis of the helical spring, has a degressive force curve. The degressive force curve of the coil spring reduces the forces on the flap system in the open position of the flap. In this way, plastic deformations, which have a negative effect on the closing force in the closed position of the closure flap, can be avoided.

In advantageous embodiments, it may be provided that the bending axis of the coil spring during pivoting of the closure flap is arranged in alignment with the hinge axis in a common line or in alternative embodiments, that the bending axis of the coil spring is offset parallel to the hinge axis during pivoting of the closure flap.

To adjust the characteristic of the spring can be provided that the bending axis is arranged laterally offset relative to the hinge axis in the direction of the surface extension of the holding plate and / or the closure flap. Alternatively or additionally, it may be provided that the bending axis is arranged relative to the hinge axis in a direction perpendicular to the surface extension of the holding plate and / or the closure flap.

In special embodiments can also be provided that the bending axis is arranged offset parallel in a common plane with the hinge axis, wherein the common plane perpendicular to Surface extension of the holding plate and / or the flap is arranged.

A particularly advantageous characteristic is obtained when it is provided that the helical spring is designed as a tension spring or as a compression spring. An optimization of the characteristic can be obtained if it is provided that the coil spring is formed in the closed position of the closure flap as a prestressed tension spring or as a prestressed compression spring. It can also be provided that the helical spring is arranged in the closed position of the closure flap with a non-linear longitudinal axis, preferably a longitudinal axis bent around the bending axis.

It can further be provided that the holding plate has a holding plate-side receptacle, is received in and / or on and / or on which supported on the holding plate first longitudinal portion of the coil spring.

In an advantageous embodiment it can be provided that the holding plate-side receptacle is formed as a channel, which is at least partially formed as a bore or a groove.

The holding plate-side receptacle may be elongated with a longitudinal extent, which is arranged at an acute angle to the surface extension of the holding plate.

It can be provided that the closure flap has a closure flap-side receptacle, in and / or on and / or on which the second longitudinal section of the coil spring supported on the closure flap is accommodated.

The closure flap-side receptacle can be formed as a channel, which is at least partially formed as a bore or a groove.

It can also be provided that the closure flap-side receptacle is elongated with a longitudinal extension, which is arranged at an acute angle to the surface extension of the closure flap.

It can be provided that the helical spring is mounted axially fixed to the first longitudinal section on the holding plate and is axially displaceably mounted with the second longitudinal section on the closure flap or that the helical spring is axially displaceably mounted with the first longitudinal section on the holding plate and with the second Longitudinal section is mounted axially fixed to the flap.

In an alternative embodiment, it may be provided that the helical spring with the first longitudinal section is mounted axially fixed on the retaining plate and is axially fixed to the second longitudinal section on the closure flap, or that the helical spring is mounted with the first longitudinal section on the retaining plate axially displaceable and is axially displaceably mounted on the closure flap with the second longitudinal section.

The coil spring may be formed as a prestressed tension spring or as a compression spring.

In an advantageous embodiment it can be provided that the retaining plate with the closure flap as a one-piece plastic injection molded part, preferably made of a thermoplastic, is formed and the hinge is formed as a film hinge. The film hinge is a section of the plastic injection-molded part, which has a comparable thickness to a film or a film and is therefore designed to be bendable. The term film hinge is understood to mean a section of a plastic part, preferably an injection-molded part, which has a small thickness comparable to a film or a film and is therefore designed to be bendable.

It can be provided that the holding plate has a connecting portion, which is connected to the closure flap via the film hinge and is connected via a second film hinge with a main portion of the holding plate having the holding plate inlet opening.

It can further be provided that an annular sealing plate made of a rubber-elastic material is arranged on the holding plate, against which the closure flap rests sealingly in the closed position.

The above-mentioned object is further achieved according to the invention already by a holding plate which is formed, as explained for the proposed dust filter bag. This solution is therefore a retaining plate for a dust filter bag for use in a vacuum cleaner. It is essential in this holding plate that the holding plate is formed as the holding plate of a dust filter bag previously described as being according to the invention.

As a preferred method for producing the proposed dust filter bag, it may be provided that the holding plate with the closure flap is made of a preferably thermoplastic material Plastic material is produced by injection molding as a one-piece injection molded part in an injection mold, wherein the coil spring is inserted before the injection molding in the injection mold and partially connected during injection molding with the thermoplastic material of the holding plate and / or the closure flap or the coil spring after the injection molding process in the holding plate and / or inserted into the flap.

It can be provided that the sealing plate is partially connected during injection molding with the thermoplastic plastic material of the holding plate, preferably in the 2K process, or is glued to the holding plate after injection molding.

Fig. 1

ein Ausführungsbeispiel des erfindungsgemäßen Staubfilterbeutels mit einer durch eine Verschlussklappe verschließbaren Halteplatte in der Draufsicht vom Innenraum des Beutels her;

Fig. 2

die Halteplatte in Fig. 1 mit Verschlussklappe in Offenstellung als Einzelteil in perspektivischer Ansicht;

Fig. 3

die Halteplatte mit der Verschlussklappe gemäß Fig. 2, jedoch als einteiliges Spritzgussteil vor der Montage;

Fig. 4

eine Federkennlinie einer Schraubenfeder der Halteplatte in Fig. 1 im Vergleich zu einer Federkennlinie einer Blattfeder.

The invention will now be explained in more detail with reference to exemplary embodiments. Show it

Fig. 1

an embodiment of the dust filter bag according to the invention with a closable by a flap retaining plate in plan view from the interior of the bag forth;

Fig. 2

the retaining plate in Fig. 1 with flap in open position as a single part in perspective view;

Fig. 3

the retaining plate with the flap according to Fig. 2 , but as a one-piece injection molded part before assembly;

Fig. 4

a spring characteristic of a coil spring of the holding plate in Fig. 1 in comparison to a spring characteristic of a leaf spring.

Fig. 1 shows a dust filter bag 1 for use in a vacuum cleaner. The dust filter bag 1 comprises a bag 11 having a bag inlet opening 11 e and a holding plate 12 arranged on the outside of the bag 11 so that the central opening of the holding plate 12 is aligned with the bag inlet opening 11 e. In the opening of the holding plate 12, a sealing ring 12d is formed to form an annular sealing lip. On the holding plate 12, a closure flap 13 is articulated. The closure flap 13 is acted upon by a spring 14 in the closed position. In the closed position, the closure flap 13 rests on the annular sealing lip 12d. The bag 11 is made of an air-permeable filter material, preferably non-woven material, whose pore width is dimensioned such that the dust contained in the sucked-in air flow is retained in the bag 11. The retaining plate 12 is formed of preferably thermoplastic material. The sealing ring 12d is formed of an elastomer, such as rubber.

The one in the illustration in Fig. 1 in a plane in front of the holding plate 12 arranged bag 11 is in Fig. 1 Deviating from the usual representation rules shown with a dashed thin line. The holding plate 12 shown in plan view from the interior of the bag 11 forth is drawn with solid lines. The bag 11 is welded to the opening edge of the bag inlet opening 11 e on the side facing the bag interior side of the holding plate 12, on a formed on this side of the holding plate 12 raised ring edge 12 r, which surrounds the central opening of the holding plate 12. In the central opening of the holding plate 12, the annular sealing lip 12d is formed. The inner edge 12di of the annular sealing lip 12d forms the inlet opening 12e of the holding plate 12. Like FIG. 3 shows, the closure flap 13 with a holding plate side Closure flap holder 12h connected via a film hinge 13f. Around the pivot axis of the film hinge 13f, the closure flap 13 is pivotable from the closed position to the open position and vice versa. When the dust filter bag 1 is inserted into the vacuum cleaner, in the suction operation, the shutter 13 is in the open position (see Fig. 2 ), so that, during operation of the vacuum cleaner, an aspirated dust-laden airflow may enter the bag 11 via the holding plate inlet port 12e and the bag inlet port 11e.

Depending on the type of vacuum cleaner, a pipe socket can engage the inlet opening 12e, 11e in the dust filter bag 1 inserted in the vacuum cleaner, so that the closure flap 13 is pivoted into its open position into the bag due to this engagement. In vacuum cleaner types in which no pipe socket engaging in the dust filter bag is present, the closing flap 13 can be pivoted into the bag 11 due to the suction pressure in its open position.

As regards the design and arrangement of the spring 14 acting on the closure flap 13 in the closed position: In the illustrated embodiment, the spring is designed as a helical spring 14. The holding plate 12 has, in the holding plate-side closure flap holder 12h, a retaining plate 12fa on the holding plate side, in which a first longitudinal section of the helical spring 14 supported therein is accommodated. The holding plate-side spring receiving 12fa is formed in the illustrated embodiment as a channel which is at least partially formed as a bore or a groove. The closure flap 13 has a closure flap-side spring receptacle 13fa, in which the second longitudinal section of the coil spring 14 which is supported on the closure flap 13 is included. The closure plate-side spring receptacle 13fa is formed as a channel which is at least partially formed as a bore or a groove.

The spring receptacles 12fa, 13fa are arranged relative to one another such that the longitudinal axes of the receptacles are arranged perpendicular to the pivot axis of the first film hinge 13f. The end portion of the coil spring 14 disposed in the holder plate side spring receiver 12fa is fixed in the spring receiver 12fa. The arranged in the closure flap side spring receiving 13fa end portion of the coil spring 14 is axially displaceable in the spring receptacle 13fa. When pivoting the closure flap 13, this end portion of the spring in the spring seat 13fa is axially displaced.

When pivoting the closure flap 13, the coil spring 14 is loaded about a bending axis 14 b, which is arranged according to the invention at an angle to the longitudinal axis of the coil spring 14. In the illustrated case, the longitudinal axis of the coil spring 14 is perpendicular to the pivot axis of the film hinge 13f and the bending axis 14b is aligned with the pivot axis of this film hinge 13f or is slightly offset parallel to the pivot axis of the film hinge 13f. This offset can be formed by appropriate arrangement and design of the spring 14 and its receptacles 12fa, 13fa to the interior of the bag 11 towards or in the opposite direction, ie in the direction of the interior of the bag 11 away.

In the illustrated embodiment, the coil spring 14 is formed as a prestressed tension spring.

The coil spring 14 is designed such that the bending radius of the coil spring corresponds approximately to three times the diameter of the coil spring. In order to allow the coil spring 14 in the open position sufficient extent and to avoid a collision of the bending radius with the closure flap 13, the configuration of the groove is based on this specification.

Fig. 4 shows a spring characteristic K1 of the coil spring 14 according to the invention in comparison to a spring characteristic K2 a known leaf spring, for example according to EP 1 849 392 A1 , Here is in Fig. 4 the spring force F over the spring travel s shown. The spring travel s is in each case proportional to the bending angle of the spring. As can be seen from the spring characteristic K2 of the leaf spring, the spring characteristic of the leaf spring on a strong linear force increase, which then goes into a degressive course. As can be seen from the spring characteristic K1 of the helical spring 14, the spring characteristic of the helical spring extends degressively from the beginning.

The characteristic curves K1 in Fig. 4 applies to a non-preloaded coil spring. The coil spring 14 is in the in the FIGS. 1 to 3 illustrated embodiment, however, designed as a prestressed tension spring. The bias is further adjustable by providing the spring with a pre-bend to be adjusted. In the coil spring 14, the angle of the pre-bend can be advantageously set in the range of 5 ° to 30 ° so as to set a predetermined closing force of the shutter 13 in the closed position. The adjustment of the preload can be made by forming the angular position of the spring retainer in the support plate 12 and / or the angular position of the spring retainer in the closure flap 13. It depends on the relative angular position of the two spring retainers in the closed position of the flap.

The bias affects the characteristic of the spring. By biasing a particularly strong degressive course is formed. Since the windings of the prestressed tension spring lie on one another with a certain preload, the force for releasing the preload must first be overcome. If this bias is overcome, the increase in force is slow and approaches a horizontal.

Fig. 3 shows the holding plate 12 with the closure flap 13 as a one-piece injection molded part 15. The injection molded part 15 is formed of a thermoplastic material.

The one-piece injection molded part 15 is in three parts. It consists of the three parts: the shutter 13, the shutter holder 12h and the holding plate 12. The three parts are connected via two film hinges 13f, 15f.

The first film hinge 13f is formed between the shutter 13 and the shutter holder 12h. The second film hinge 15f is formed between the holding plate 12 and the shutter holder 12h.

During assembly, the closure flap holder 12h connected to the closure flap 13 is rotated 180 ° about the pivot axis of the second Film hinge 15f pivoted, ie folded, so that the shutter holder 12h reaches the end position in which the shutter holder 12h rests on the support plate 12 and the shutter 13 comes into the closed position. Before this folding over during assembly, the coil spring 14 can be mounted, that is, inserted into the spring receptacles 12fa, 13fa described above. But it is also possible to insert the coil spring 14 already in the injection molding apparatus, so that the coil spring 14 is integrated into the injection molded part 15.

LIST OF REFERENCE NUMBERS

1

Vacuum Cleaner Bags

11

bag

11e

Bag inlet port

12

Retaining plate

12d

sealing ring

12DI

Inner edge of 12d

12fa

spring mount

12h

Holding plate for flap holder

12r

projecting annular rim

12e

Holding plate inlet port

13

flap

13 fa

spring mount

13f

first movie hinge

13h

Flaps holder

14

coil spring

14b

Bending axis of the coil spring

15

injection molding

15f

second movie hinge

K1, K2

Spring characteristics

F

spring force

s

travel

Claims (19)

Dust filter bag (1) for use in a vacuum cleaner, comprising - a bag (11) of filter material with a bag inlet opening (11e); a holding plate (12) having a holding plate inlet opening (12e); a closure flap (13) which is pivotably mounted on the holding plate (12) via a hinge (13f) about a hinge axis such that the closure flap (13) closes the holding plate inlet opening (12e) in a closed position and in an open position the holding plate inlet opening (12) 12e) releases; - wherein the holding plate (12) in the region of the bag inlet opening (11 e) on the outside of the bag (11) is arranged such that the bag inlet opening (11 e) with the Halteplatteneinlassöffnung (12 e) is aligned; - wherein the closure flap (13) by a spring (14) is acted upon in the closed position by the spring is supported by a first end to the closure flap (13) and with a second end to the holding plate (12), characterized,
in that the spring is designed as a helical spring (14) with a longitudinal axis running coaxially with the helical turns of the helical spring (14),
wherein the coil spring (14) in its extension along the longitudinal axis has a first longitudinal portion which on the holding plate (12) is supported and has a second longitudinal portion which is supported on the closure flap (13),
wherein the support and arrangement of the coil spring (14) is formed such that upon pivoting of the closure flap (13) the coil spring (14) is loaded about a bending axis (14b) which is arranged at an angle to the longitudinal axis of the coil spring (14). Dust filter bag according to claim 1,
characterized,
that the bending axis (14b) of the helical spring (14) during pivoting of the closure flap (13) with the hinge axis in a common line in alignment or offset parallel to the hinge axis. Dust filter bag according to one of the preceding claims,
characterized,
is arranged that the bending axis (14b) offset relative to the hinge axis in the direction of the surface extension of the holding plate (12) and / or the closure flap (13) laterally. Dust filter bag according to one of the preceding claims,
characterized,
in that the bending axis (14b) is arranged relative to the hinge axis in a direction perpendicular to the surface extension of the holding plate (12) and / or the closure flap (13). Dust filter bag according to one of the preceding claims,
characterized,
that the bending axis (14b) is arranged offset in parallel in a common plane with the hinge axis, wherein the common plane is arranged perpendicular to the surface extension of the holding plate (12) and / or the closure flap (13). Dust filter bag according to one of the preceding claims,
characterized,
that the helical spring (14) is designed as a tension spring or as a compression spring. Dust filter bag according to claim 6,
characterized,
that the helical spring (14) is designed in the closed position of the closure flap as a prestressed tension spring or as a prestressed compression spring. Dust filter bag according to one of claims 6 or 7,
characterized,
in that the helical spring (14) is arranged in the closed position of the closure flap with non-linear longitudinal axis, preferably around the bending axis (14b), bent longitudinal axis. Dust filter bag according to one of the preceding claims,
characterized,
that the holding plate (12) has a holding plate-side spring receiver (12fa), in and / or on and / or on the on the holding plate (12) supported first longitudinal portion of the coil spring (14) is received, and / or
that the closure flap (13) has a closure flap-side spring receiver (13fa), in and / or on and / or on the on the closure flap (13) supported second longitudinal portion of the coil spring (14) is accommodated. Dust filter bag according to one of the preceding claims,
characterized,
that the holding plate-side spring receptacle (12fa) is formed as a channel, which is at least partially formed as a bore or as a groove, and / or
that the closure flap-side spring receptacle (13fa) is designed as a channel, which is formed at least in sections as a bore or as a groove. Dust filter bag according to one of the preceding claims,
characterized,
in that the holding plate-side spring receptacle (12fa) is elongated with a longitudinal extension which is arranged at an acute angle to the surface extension of the holding plate (12), and / or that the closure flap-side spring receptacle (13fa) is elongated with a longitudinal extension which is pointed Angle to the surface extension of the closure flap (13) is arranged. Dust filter bag according to one of the preceding claims,
characterized,
in that the helical spring (14) is mounted axially fixed with the first longitudinal section on the holding plate side and with the second Longitudinal section closure flap side is mounted axially displaceable or,
in that the helical spring (14) is mounted so as to be axially displaceable on the holding plate side with the first longitudinal section and is mounted axially fixed with the second longitudinal section on the closure flap side. Dust filter bag according to one of claims 1 to 11,
characterized,
in that the helical spring (14) is mounted axially fixedly on the holder plate side with the first longitudinal section and is mounted axially fixed with the second longitudinal section on the closure flap side, or
in that the helical spring (14) is mounted so as to be axially displaceable with the first longitudinal section on the holding plate side and is mounted so as to be axially displaceable with the second longitudinal section on the closure flap side. Dust filter bag according to one of the preceding claims,
characterized,
is that the retaining plate (12) with the closure flap (13) as a one-piece plastic injection-molded part, preferably of a thermoplastic, is formed and the hinge as a film hinge (13f) is formed. Dust filter bag according to claim 14,
characterized,
in that the holding plate (12) has a connecting portion (12h) which is connected to the closing flap (13) via the film hinge and is connected via a second film hinge (15f) to a main portion of the holding plate (12) which forms the holding plate inlet opening (12e) having. Dust filter bag according to one of the preceding claims,
characterized,
in that a preferably annular seal (12d) made of a rubber-elastic material is arranged on the retaining plate (12) against which the closing flap (13) rests sealingly in the closed position. Retaining plate for a dust filter bag for use in a vacuum cleaner,
characterized,
in that the holding plate is designed in the same way as the holding plate (12) of a dust filter bag formed according to one of the preceding claims. Method for producing a dust filter bag (1) according to one of claims 1 to 16,
characterized,
in that the holding plate (12) with the closure flap (13) is produced from a preferably thermoplastic material by injection molding as a one-piece injection molded part (15) in an injection molding tool, wherein the helical spring (14) is inserted into the injection molding process Injection molding tool is inserted and during injection molding partially with the thermoplastic material of the holding plate (12) and / or the closure flap (13) is connected or the coil spring (14) after the injection molding process in the holding plate (12) and / or in the closure flap (13) is inserted. Method for producing a dust filter bag (1) according to claim 18,
characterized,
that the preferably annular seal (12d) during injection molding is partially connected to the thermoplastic material of the holding plate (12) or is glued to the holding plate (12) after injection molding.

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