US2324231A

US2324231A - Vacuum cleaner dust bag

Info

Publication number: US2324231A
Application number: US416473A
Authority: US
Inventors: Osterdahl Ragnar Konstantin
Original assignee: Individual
Current assignee: Commscope Connectivity LLC
Priority date: 1939-03-01
Filing date: 1941-10-25
Publication date: 1943-07-13
Anticipated expiration: 1960-07-13

Description

July 13, 1943.

R. K. OSTERDAHL VACUUM CLEANER DUST BAG Filed O61.- 25. 1941 lNvENjrOR WWfiM BY f 4,; AORNEY Patented July 13, 1943 UNITED VACUUM CLEANER DUST BAG Ragnar Konstantin osteraam, Store Essingen. Sweden Application October 25, 1941, Serial No. 416,473 In Sweden March 1, 1939' 2 Claims.

The present invention relates to dust-collecting vacuum cleaner bags, more particularly of the type comprising a dust-separating filter and a perforated supporting jacket arranged on the outside of said filter. It is essential that these bags should be very cheap, especially if they are of the kind which is to be thrown away after use. Both filter and supporting jacket should therefore be made of as cheap material as possible. A cheap bag material of this kind is paper. However, the perforations of the paper should not lie too close together, as this may cause the jacket of the bag to burst, when it is exposed to suction action. With the perforations properly spaced for strength, however, the filter is not always utilized to the fullest, because the air is likely to pass through the comparatively small portions of the filter located directly opposite the orifices of the jacket, whereas those portions of the filter which are covered by the remaining parts of the jacket let through a less quantity of air, thus separating comparatively small quantities of dust.

The present invention relates to an efficient device for eliminating this drawback, that is for effecting a uniform distribution of the passage of air and, consequently, an increased filtering capacity.

In conformity therewith the device according to the invention is characterized substantially in that the jacket of the bag is formed in its interior with supports adapted to bear against the filter and keep it at a distance from the perforations of the jacket. The supports may consist of inwardly bent tongues partially cut from the jacket of the bag and formed during the formation of the perforations. To bring about an efficient supporting action these tongues should preferably be folded backwardly towards the jacket of the bag. The supporting effect of the tongues may be increased, if they are arched, folded or corrugated. The filter lining of the bag may consist of one or more superposed sheets or layers. v

According to the invention the dust-collecting bag may be made in such manner that tongues are punched out and folded inwardly and backwards in a sheet or band of paper or similar thin material, a filter sheet or filter band being made of one or more superposed layers of wadding of wood cellulose, of which layers one or more or all are perforated and thus loosened, whereupon the filter is applied to the sheet or the band of paper or the like, and the sheet formed in this manner, or cut-off portions of the band thus formed, are

shaped into vacuum cleaner dust bags with inside filters.

The accompanying drawing shows some embodiments of the invention.

Fig. 1 is a side view, partly in section, of a dust-collecting bag constructed according to the invention.

Fig. 2 is a sectional view on a larger scale of a lower part of the bag.

Figs. 3 and 4 show on a very enlarged scale a front view and a sectional view of a part of the wall of the bag.

Figs. 5-7 are views corresponding to Fig. 3 and.

showing other embodiments.

Figs. 8 and 9 are views corresponding to Figs. 3 and 4 but relating to another embodiment.

The jacket I of the dust-collecting bag shown in Fig. 1 is assumed to be made of thin paper or similar material. The bottom 3 of the has consists of portions of the bag jacket turned-in crosswise and in pairs relatively to each other. The inner side of the jacket of the bag is covered by a filter 2 comprising a plurality of superposed thin sheets or layers. As a filter material use may be made of wadding of cotton or preferably wood cellulose. The fibres of the wadding of wood cellulose, are, if desired, loosened, for example, by perforation with needles or some similar treatment.

At the lower end of the bag the filter sheets, except the innermost sheet 4, are pasted to each other. The edge of the outermost sheet bearing against the jacket I is pasted to this jacket. The edge of the innermost filter sheet not being pasted facilitates the manufacture of the bag and at the same time prevents the bag in its folded state (according to Fig. 1) from being pasted together owing to the transfer of paste at the lower edges of the sheets. At the upper edge of the filter all layers may be pasted to each other and to the jacket of the bag. A band 5 folded in its transverse direction is pasted to the upper edges of the filter 2 and the jacket I of the bag, and may be folded out so as to form a plane, annular flange for fixing the bag to the vacuum cleaner.

The jacket I of the bag is perforated by punching out flaps Gwhich are folded inwards (Figs. 3 and 4) and backwards towards the jacket of the bag so as to form resilient supports for the filter 2. The tongues may be given an arched shape which enhances their supporting effect. To increase the height of the filter supports formed by the tongues the latter may be bent down to contact the inner surface of the jacket (Fig. 5). rolled up on themselves (Fig. 6) or folded back on themselves (Fig. 7).. I! desired, the tongues may be corrugated in their longitudinal direction. The supporting action of the tongues keeps the filter 2 at some distance from the jacket of the bag so that its capacity is practically wholly utilized. In fact. the air can flow transversely through all parts of the filter, and then through the intermediate spaces 1 to those orifices I in the jacket of the bag which are formed by the folding-in of the tongues. When the bag is exposed to outer suction action, the filter is pressed against the tongues which press resiliently against the jacket of the bag, without, however, the filter being forced closely/against said jacket. Each time the suction action ceases, the tongues rebound resiliently. The movements or the tongues and the inherent resiliency of the filter (especially if it is made of wood cellulose) produce in the filter movements by means of which dust is loosened from the filter. The arrangement of the supports thus makes the filter to some extent self-cleaning.

This dust-collecting bag may be made on a somewhat modified machine intended for the manufacture of ordinary paper bags. In this case the tongues 3 are punched out and folded inwards and backwards in the sheet or band of paper or the like which is to make up the jacket of the bag. On the machine there is simultaneously made a filter sheet or filter band of one or more superposed layers of wedding of wood cellulose, of which layers one or more are perforated so as to loosen the filter and give it the desired resilient properties. The sheet or band 01' filter material thus produced and treated is joined to the perforated sheet or band in such a manner that the filter is placed on the backwardly folded tongues and is fastened to the perforated band or sheet in the manner described above. The folded collar (if desired in the shape of a band) is also pasted to the sheet or band thus formed. 01 the sheet thus shaped or the sheets cut out 01' the band the bag is then formed. its bottom being turned in crosswise and tolded up so that the bag shown in Fig. 1 is obtained.

According to Figs. 8 and 9 the above-mentioned increase in the capacity of the filter is obtained by providing the jacket or the bag with inwardly directed elevations in the shape of impressed corrugations 9 extending between the orifices i of the jacket of the bag.

What I claim is:

1. In a vacuum cleaner dust bag, an outer jacket member, a lining of filtering material supported within said jacket, said Jacket being formed with a plurality of apertures, and tongues integral at one end with said Jacket at the edges of said apertures, said tongues being turned away from said apertures at angles eater than to thereby space said filtering material from the inner side of said jacket.

2. In a vacuum cleaner dust has, an outer jacket member, a lining of filtering material supported within said Jacket. said jacket being formed with a plurality of apertures, and tongues integral at one end with said jacket at the edges of said apertures, said tongues being turned backwardly from said apertures and curved with the free ends of the tongues in contact with the inner side of said jacket and with the intermediate portions of the tongues spaced therefrom, whereby to space said filtering material from the jacket.

RAGNAR KONSTANT'IN bsTERDAI-IL.