DE1151905B - Paper filter bags for vacuum cleaners - Google Patents

Description

The invention relates to a paper filter bag for vacuum cleaners and in particular to such a bag, which, after being filled with dust, can be thrown away. It's already a collapsible one Known dust collector for vacuum cleaners, which destroyed or burned after use along with the contents can be. This known dust collector consists of a dust bag with a filter made of cotton wool Wood pulp. This filter is inserted between the jacket and a lattice-shaped lining. The coat has cut-out lobes. The dust passing through the filter will be at this dust catcher is not held back but adversely occurs through the cut out Flap outwards. Another disadvantage of this known dust bag is that the Air can only pass through those parts of the inner filter that are immediately behind the cut out lobes. This greatly reduces the effective filter area of the dust bag, so that this dust bag clogs up very quickly.

Another well-known paper filter for vacuum cleaners consists of a paper thread fabric that is on the The side exposed to the air flow with, for example, staple fibers, shredded paper or the like. Existing Fringing is occupied. These fringes are arranged regularly and in an appropriate manner attached to the paper thread fabric. The hanging paper fringes work in the known device like an impact filter, in that the dust-laden air flow is deflected several times so that the Dust particles are excreted by an impact effect. The main filter effect is immediate here at the fringes, and the coarse paper thread fabric only acts as a framework for the filter. Manufacturing such a paper filter is very expensive, and these paper filters are not very reliable in operation.

The present invention is based on the object of a paper filter bag for vacuum cleaners create that can be manufactured in the simplest way and that is very reliable.

According to the invention, in a paper filter bag, the paper bag is lined with a filter material, whose porosity is greater than that of the paper bag. This paper filter bag advantageously has an outer paper bag which has sufficient strength to withstand a tear pressure To resist, and enough small spaces to hold back the fine dust particles, which passed through the lining

Paper filter bags for vacuum cleaners

Applicant:

Electrolux Corporation,
Old Greenwich, Conn. (V. St. A.)

Representative: Dipl.-Ing. E. Prinz, patent attorney,
Munich-Pasing, Bodenseestr. 3 a

Claimed priority:
V. St. v. America May 11, 1953 (No. 354 148)

Henry Weed Stevens, Malvearn, Pa.,

Gustaf Einar Lofgren, Riverside, Conn.,

Raymond Le Clair Brown, Noroton Heights, Conn., And Arnold Henry Beede, Stamford, Conn.

(V. St. Α.),
have been named as inventors

genes are. Most of the fine dust is held back by the lining without doing anything the lining quickly clogs. The amount of fine dust that hits the surface of the paper bag reached, is so low that no rapid clogging of the paper bag occurs. The dust bag according to the The invention can advantageously hold back a much larger amount of fine dust than this is the case with the previously known anthers.

The lining can be formed by a feed bag. It can be useful that the Feed bag consists of a multitude of layers that are attached to each other in a point-like manner and one be thicker than the paper bag.

A layer of fiber material, e.g. B. Wadding made of cotton, wool, cellulose, Synthetic fibers or the like. Be provided.

It can be useful that the paper bag and the feed bag are made in a manner known per se foldable layers are formed and that the paper filter bag a number of pairs are folded against each other Has walls. These walls can expediently be extensions at one end have, which are bent inwards essentially at right angles to the respective wall,

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wherein the extensions to one another to form Fig. 9 on an enlarged scale after a section

a flat end portion with an opening into the interior of line 9-9 of Figure 6,

of the feed bag are attached. In particular, FIG. 10 can be a section through a partially

the bags have two pairs of side walls, blown and partly filled with loose fiber material

at the walls of each pair of bags filled substantially parallel to 5, the section along the line 10-10

is guided to one another and essentially at right angles to FIG. 11,

are arranged to the walls of the other pair, Fig. 11 is a section along the line 11-11 of the

when the bag is inflated, and each of Fig. 10,

Side walls of one of these pairs are shown in longitudinal Fig. 12 a section through that in Figs. 10 and 11

direction extending fold line, along which bag shown, but in fully inflated

these walls standing between the other pair of walls and with the one passing through the bag

folded in the compressed state. tend air flow distributed loose fiber material, and

At one end these walls can be joined together be folded and glued together. The one, however, shows a bag in which the loose Individual layers of the paper filter bag can be made in 15 fiber material adhering to the inner walls of the bag in the longitudinal direction of the bag should be folded, whereby the one part has been applied.

In the drawings, and particularly in FIG. 1, on opposite edges of each layer

are arranged overlapping on the other and each other denotes 10 generally one after use for

are glued in such a way that the adhesive points against one- throw away certain paper filter bags according to the

other are offset. . 20 invention, used in a vacuum cleaner. This

The feed bag can on the paper bag along a vacuum cleaner has a housing 12 in which the

Line glued to be used in the longitudinal direction of the bag for the use of the vacuum cleaner

Bag extends. is. At one end of the housing is a motor-driven

The inner surface of the feed bag can have one built-in fan 14, while the other train from an adhering to this fiber material 25 end through a removable cover 16 removed. This fiber material can originally be closed. The lid has a single lot be arranged inside the feed bag, let line 18 provided, which when attached and through the air flow, this fibrous material cover will protrude into the interior of the housing 12. That The outer end of the inlet conduit is provided with a part 20 to form a filter layer on the inner surface of the feed bag distributed. 30 provided a detachable hose coupling, by means of

It is within the scope of the invention that the outlet is a flexible hose to the inlet line

Clothing of the paper bag from loose inside the can be attached.

Paper bag arranged fiber material consists. The filter bag 10 has an outer bag

The lining can also consist of one on the part with a first pair of side walls 22 and 24 and

The inner surface of the bag is attached to a cover of one 35, a second pair of side walls 26 and 28. These four

individual fibers exist. Walls are best seen in FIG. the

Appropriately, the opening, the side walls 26 and 28 are with them in the longitudinal direction

is intended for receiving the inlet line, formed with extending center folds 30 and 32, so

be provided with a self-sealing closure that these walls between the walls 22 and 24

opens when the line is inserted and can be folded up flat after the 40, if

Removing the line closes again. One of the filter bags is in its collapsed

Such a closure of a filter bag is actually in the state. The bag part is made from an original

knows. originally smooth sheet of paper produced, its

In the figures of the drawing, execution longitudinal edges are provided by a seam 34 in the side wall

examples of the invention shown schematically. There are 45 22 attached to each other,

shows when the bag is in its inflated

Fig. 1 is a side view, partly in section, a stand is, as shown in Figs. 1 and 8, the

bag inserted in a vacuum cleaner according to the side walls of each pair parallel to each other, while

Invention, rend the side walls of the different pairs to-

Fig. 2 is a side view of the 50 shown in Fig. 1 on the other hand are substantially perpendicular.

Bag, but in the folded state, the left ends of the side walls are, like both-

3 shows a top view of the example shown in FIG. 2, shown for example in FIG.

means with broken away parts, which when the bag part is in his

Fig. 4 is a view, partly in section, in the inflated condition, inwardly in

Fig. 1 to 3 shown bag, but at a very large 55 substantially at right angles to the side walls.

larger scale to stretch the multilayer training. The side walls 22 and 24 are provided with

tion of the lining to show extensions 36 and 38, respectively, while the

Fig. 5 is a view similar to Fig. 3, each side walls 26 and 28 with extensions 40 and

but the bag part is formed before the cardboard 42 is applied. As Fig. 5 shows, the length is

disk shows, looking towards the line 5-5 of the 60, each extension is less than half of the

Fig. 7, standing from the respective side wall to the other

Fig. 6 is a view similar to Fig. 3, each side wall of the same pair, so that a right but the sealing means for the opening in the angular opening 44 in the flat end portion of the bag is facing shows, handen is.

Fig. 7 is a section along the line 7-7 of Figs. 3, 65 at the flat end portion is by means of a suitable

Fig. 8 also shows a section along the line 7-7 adhesive a flat, in a known manner,

3, which, however, has the bag in a fully rigid disk 48 made of cardboard or the like.

In its original state it is attached, preferably with a circular

opening 50 is provided, which with the rectangular Opening 44 is in communication. The openings 50 and 44 together therefore form an inlet opening for the container through which the inlet conduit 18 extends when the container is in the vacuum cleaner is used.

Within the outer bag part of the container, a feed bag designated 52 is arranged. This feed bag is preferably made of a fiber material layer that has a much greater porosity has than the outer bag. A suitable material for this purpose is cellulose wadding, the larger one Has gaps than the porous paper of the outer bag. To the thickness or depth you want of the lining can be achieved using a variety of cellulose layers be used. These layers are preferably bonded to one another by glueing, applying pressure Od. Like. Connected, so that a single easy-to-handle layer is formed. The in In the example shown in FIG. 4, four layers are provided which are longitudinally spaced from one another parallel lines 54 are pressed together. However, a different number of layers can also be provided which may be attached to each other in ways other than along lines. The area with whichever they are attached to one another should be kept as small as this with regard to the required Relationship of the layers is possible, since this area of the feed does not have such good filter properties has like the rest of the area, which is due to the fact that the pressure the thickness or depth of the lining decreased.

The feed bag is designed with the same pairs of side walls and end extensions as the outer bag. However, as can be seen from Fig. 9, the overlapping area is that forming the feed bag Material layer laterally offset from that of the layer forming the outer bag, see above that the longitudinal seam 56 of the feed bag is also offset with respect to the longitudinal seam 34 of the outer bag is. This not only reduces the thickness of the assembled bag at the seams, but also enables the overlapping edges of the layer forming the outer bag to be immediate can be glued together, d. H. without the lining layer between the overlapping ones The edges of the outer layer come to rest. As can also be seen from FIG. 9, the developed width of the lining layer be slightly less than that of the outer layer, as for the inner seam 56 a smaller overlap is required than for the outer seam 34. This has its The reason is that the outer seam has to withstand the tear pressure while the lining bag is through the The outer bag is mechanically supported and therefore the lining seam 56 is only slightly or at all is not exposed to any force tending to burst the seam.

As shown in Fig. 5, the extensions 36 and 38 rest on the extensions 40 and 42 so that, when the end plate 48 is glued to these four extensions, parts of the extensions 36 and 36 38 are located between the extensions 40 and 42 and the disc. Because the feed bag extensions which correspond to those of the outer bag, the extensions of the feed bag part come, corresponding to extensions 40 and 42 between extensions 40 and 42 and the extensions 36 and 38 as shown in FIG. The feed bag is therefore at the inlet end connected to the outer bag. The adhesive used to form the seam 56 can also be used penetrate the lining and adhere it to the outer bag along this seam line. A bag of the type described can thereby be manufactured on automatic paper bag machines be that these at the same time a porous web

ίο paper for the outer bag and a sheet of layered Cellulose wadding for the lining is fed in such a way that the two webs are side by side are offset by the amount that is necessary to the above-described lateral distance of the To achieve seams.

The opposite end of the disc 48 of the bag part is closed in such a way that the Sidewalls are folded and glued a number of times as shown at 58. Since that too If the same end of the feed bag is enclosed in this fold, the two bags are closed at theirs Ends attached to each other.

When a bag of the prescribed type is inserted into a vacuum cleaner and it carries fine dirt with it Air is introduced through line 18, most of the fine dirt is carried by the Food withheld. Even if the dirt particles can be smaller than the gaps between the fibers of the material used to form the lining, there is only a small proportion of this Particles find their way through the individual layers due to the depth of the filter formed by them. The small portion that still finds its way through the filter is through the porous paper of the outer bag part retained. However, if the food weren't there, the whole thing would fine dirt immediately reach the inner surface of the outer bag and the small spaces in between clog quickly between the fibers of the same.

This would rapidly increase the pressure drop through the bag, reducing the air flow which would result in a reduction in the efficiency of the vacuum cleaner. Due to the fact that a lining is provided, only a small proportion of the fine dirt gets through to the inner surface of the outer bag. The dirt held back by the lining clogs its interstices not as quickly as is the case with the smaller interstices of the outer bag So that a bag according to the invention would hold a much larger amount of fine dirt can be used as an unlined bag with the same efficiency as the vacuum cleaner. The material of the Due to the pressure drop through both bags, the outer bag has a mechanical strength that is sufficient to withstand the rupture pressure that becomes effective on this.

As a result of the fact that the feed, especially when it is still clean, one of the air flow

no opposes much less resistance than that The outer bag and the outer bag is only attached at the ends and possibly along the seam 56, it could happen, especially if the dust container is in the vacuum cleaner with the seam 56 on the The bottom is inserted so that the beginning air flow inflates the outer bag without the inner bag inflate unless both bags are formed with inwardly folded side walls 30 and 32

would be. As can be seen from Fig. 9, the inflation of the outer bag causes the folded ones Flatten walls 30 and 32, taking with them the correspondingly folded walls of the lining which ensures that both bags are inflated together. If the If the inner bag would not expand with the outer bag, this could result in parts of the Inner bags are not supported by the outer bag, which can cause them to become airborne begin to flutter and the inner bag can tear as a result. Furthermore, if a proportionate heavy solid body, e.g. B. a stone, through the flow of air into the container when partially supported If the inner bag is entered, this can easily tear the inner bag.

An even greater filter depth can be achieved with the bag shown in FIGS. 10 to 12, which likewise is intended to be thrown away after use. In this embodiment of the invention, the loading is a ° holder of the embodiments described above partially filled with loose fiber material 60. This material can be fed into the bag by means of a stream of air directed through the inlet opening or through the opposite end of the bag before the side panels are unfolded and glued together to be introduced. The loose fiber material used for this purpose can be of various types, however, it has been found that elastic, fine, coarse fibers, e.g. B. wool, cotton, cellulose or synthetic fibers, are beneficial.

To avoid spillage of the loose fiber material from the bag through the inlet port 50 prior to insertion Preventing the bag in a vacuum cleaner is preferably used in a manner known per se a self-sealing plug as shown in Figs. 6, 10 and 11 is provided at the inlet. For this The purpose is a layer of elastic material 62, for example a rubber sheet, on the outer surface the disk 47 is glued so that it covers the opening 50 thereof. This plate usually has a narrow, elongated opening 64 approximately in the middle of the opening 50. On the outside of the disk 48 a strip 66 of lightweight cardboard is attached which initially extends over the opening 64 and with it a weaker part 68 of an edge of the opening 50 is provided adjacent. Preferably is still an outer disk 48 a of the same size and shape as the disk 48 on this above the elastic Plate 62 and the strip 66, as shown in Fig. 10, glued.

When the fiber material is to be introduced through the inlet opening of the container, one of the Inlet line 18 similar line inserted through opening 50. By inserting this line if the strip 66 is interrupted at its weak part 68 and the rubber plate 62 is stretched, so that the normally small opening 64 is widened sufficiently to receive the conduit. A certain amount of loose fiber material is blown in through the inlet duct. At the next Withdrawal of the line takes the opening 64 in the rubber plate back to its normal size, whereby the end of the strip 66 remains inserted through this, so that this opening 64 is practically closed which prevents spillage of the loose fiber material during handling of the bag prior to insertion in the vacuum cleaner is prevented.

When the bag is inserted into the vacuum cleaner and the motor-driven fan started is, the air flowing in through the line 18 inflates the bag and distributes the loose fiber material 60 with a more or less uniform layer, as shown in Fig. 12, over the Inner surface of the lining. This loose material has a much greater thickness or depth than the lining and therefore can trap and hold back a large amount of fine dust before it becomes clogged. Most of the fine dust that may pass through the loose material will intercepted by the lining so that very little fine dust reaches the inner surface of the outer bag. A bag of the last-described embodiment can therefore contain a much larger amount hold back fine dust before the pressure drop becomes sufficiently large without affecting the efficiency of the vacuum cleaner is significantly reduced than with the other types.

As can be seen from the foregoing, the chuck 52 can also be omitted and the task to catch the fine dust before it reaches the inner surface of the outer bag, entirely on the loose fiber material be transmitted.

Instead of introducing the fiber material loosely into a finished or partially finished container and using it to allow the air flow generated by the vacuum cleaner to distribute the fiber material accordingly, glue may be applied to spaced apart locations on the inner surface of the bag and loose fiber material preferably directly, as it is delivered by a card, into the full expanded bag are blown. In this case, the fiber material is transported by the air flow fairly evenly distributed over the inner surface of the bag to which it is held by the adhesive will. As a result of the fact that the adhesive tends to seal the gaps in the bag, it must not be applied in one uninterrupted layer, but, as described above, only at points that are at a distance from one another. A pouch in accordance with this embodiment of the invention is shown in FIG the loose fiber layer 70 adheres to the adhesive points 72 on the inner surface of the feed bag. As in the embodiment according to FIGS. 10 to 12, the feed bag can be omitted and the layer can be loosened Fiber material 17 can be applied directly adhering to the inner surface of the outer bag. Instead of To bring the fiber material into a finished bag, it can be applied to the paper or lining web before it is formed into a bag.

Claims (14)

PATENT CLAIMS: 1. Paper filter bags for vacuum cleaners, characterized in that the paper bag is lined with a filter material whose porosity is greater than that of the paper bag. 2. Paper filter bag according to claim 1, characterized in that the lining is a feed bag is. 3. Paper filter bag according to claim 2, characterized in that the feed bag consists of a There is a large number of layers that are attached to one another in a point-like manner and are of greater thickness than the paper bag. 4. Paper filter bag according to claim 2 or 3, characterized in that the paper bag and the feed bag are made of foldable layers and that the paper filter bag is a Has number of folded wall pairs (Fig. 9). 5. Paper filter bag according to claim 4, characterized in that the wall parts on one End have extensions that are substantially at a right angle to the respective Wall are bent inwards and that the extensions join together to form a flat End part are attached with an opening (Fig. 5 and 6). 6. paper filter bag according to claim 4 and 5, characterized in that the bag has two Sidewall pairs comprises that the walls of each pair are substantially parallel to one another and are arranged substantially at right angles to the walls of the other pair, when the bag is inflated and that each of the side walls of one of these pairs fit into Having longitudinally extending fold line along which these walls between the other Wall pair are folded in the compressed state (Fig. 9). 7. Paper filter bag according to one of claims 4 to 6, characterized in that the Walls of the paper bag and the feed bag folded at one end and joined together are glued. 8. Paper filter bag according to one of claims 4 to 7, characterized in that the Layers are folded lengthways of the bag that the opposite edges each layer overlap each other and are glued together in such a way that the adhesive points are offset from one another. 9. paper filter bag according to claim 8, characterized in that the feed bag on the paper bag is glued along a line which extends in the longitudinal direction of the bag. 10. Paper filter bag according to one of claims 2 to 9, characterized by at the Fiber material adhering to the inner surface of the feed bag. 11. Paper filter bag according to claim 10, characterized in that the fiber material originally is loosely arranged in the inner feed bag. 12. Paper filter bag according to claim 1, characterized in that the lining is made of fiber material loosely arranged inside the paper bag. 13. Paper filter bag according to claim 1, characterized in that the lining is made of consists of a coating of individual fibers attached to the inner surface of the bag. 14. Paper filter bag according to claim 10 or 11, characterized in that the opening, the is intended for receiving the inlet pipe, provided with a self-sealing closure that opens when the cable is inserted and again after the cable is removed closes. Considered publications:
German Patent Nos. 642 561, 704 513;
German patent application D 10302 III / 58e (published on 12.3.1953);
French patent specification No. 939 472. 1 sheet of drawings © 309 648/29 7.