A DUST SEPARATOR

Abstract: A dust separator for a vacuum cleaner (1-6), in which the bag (8) is sealingly connected to a rigid member (7) that screens-off an air-flow passageway (1) through the vacuum cleaner and has an opening (71) with which the bag (81) connects. The screening member (7) is separate from the bag (8, 81). Mounted at the orifice of the bag (8, 81) is a flange (83) which functions to prevent the bag (8) from being drawn through the opening (71) in the screening member in the direction of air flow through the vacuum cleaner. The flange (83) can be collapsed (86, 89) to enable it to be passed through the opening (71) in the screening member (7) when the bag is full.

Description: A DUST SEPARATOR The present invention relates to a dust separator of the kind defined in the preamble of Claim 1. Thus, the invention relates to a dust separator for a vacuum cleaner in which the bag is sealingly connected to a rigid screening plate around an opening through the plate, wherein the plate screens-off an air-flow passage through the vacuum cleaner. In conventional vacuum cleaners of the kind to which the invention refers, the air-permeable and dust-separating bag is connected permanently to the screening plate, wherewith the plate and the actual bag are both replaced at the same time when the bag is full and needs replacing. Dust separator units that include a bag which is permanently connected to a rigid screening plate must be stocked in many different models and makes, since the air-flow passageways of different makes and models of vacuum cleaners have different designs and dimensions, therewith requiring a screening plate of corresponding design and dimensions in order for the plate to screen-off the passageway. It is therefore obvious that such dust separator units will demand a relatively high price, owing to the fact that they must be produced in relatively small numbers. Furthermore, consumer stations are obliged to provide dust separator units of many different designs, in order to meet different consumer requirements. This results in high manufacturing and retail costs, which means a relatively high price for individual dust separators in respect of the customer at the "end of the line". It is also necessary for the customer to be aware of the make, year model, etc., of his or her vacuum cleaner, if she/he is to choose the correct "dust separator bag" in the store or shop. It is also a common occurrence that the range of dust separators kept in stock will not include one or more of the actual type of separator required by the customer. An object of the present invention is to reduce these drawbacks . This object is achieved with a dust separator according to Claim 1. Further embodiments and developments of the inventive vacuum cleaner bag are defined in the dependent Claims. The inventive dust separator differs from a conventional, known dust separator in that the actual bag is in itself a unit that is separate from the aforementioned screening-off plate, in that the bag has a flange which functions to prevent the bag from being drawn through the opening in the plate in the direction of air flow, and in that the flange is collapsible, preferably manually collapsible, so as to enable the flange to be passed through the plate opening when needing to change a full bag. The main part of the bag can be threaded bottom-first through the plate opening in the direction of air flow until the flange rests against the upstream surface of the plate. The flange may have a generally annular configuration, so that its solid-ring surface will abut the plate around the plate opening and therewith establish an effective seal. If desired, a sealing agent, e.g. a plastic foam annulus or the like, may be mounted on the surface of the flange that faces towards the plate. Plate openings are, in the main, similar in different plates for different vacuum cleaner models and makes. Thus, the different plates normally have a circular opening of specific diameter. The flange may be made collapsible, by providing the flange with a generally radial weakening or fold indication for instance, which enables the flange to be folded or bent around a line that generally or approximately constitutes a flange diameter. That side of the flange which lies distal from the plate may be provided with an adhesive and the adhesive covered with a peelable release strip. The adhesive may be disposed so as to seal the bag when the flange is collapsed around said weakening or fold indication. Naturally, the flange may include several weakenings which enable the flange to be folded, bent or wrinkled around several axes. The flange weakenings are thus intended to enable the flange to be collapsed to a size that will enable the flange to be threaded through the plate opening, especially when the bag shall be removed from the plate when the bag is full. It will be understood, however, that the bag can also be fitted to the plate by first collapsing the flange around a fold weakening and then threading the flange through the plate opening in a direction opposite to the direction of air flow, and thereafter opening out the flange to a plane that lies parallel with and adjacent to the plane of the plate. As before mentioned, the flange may conveniently be designed to be collapsed manually. The invention will now be described in more detail with reference to an exemplifying embodiment thereof and also with reference to the accompanying drawing. Fig. 1 is a schematic sectional view of a vacuum cleaner that includes a dust separator. Fig. 2 is a schematic sectional view of a dust separator that includes an inventive vacuum cleaner bag. Fig. 3 is a schematic illustration of the support flange of the vacuum cleaner bag in a collapsed, sealed state. Fig. 4 is a schematic illustration showing how the collapsed bag-flange is passed out through an aperture in the bag carrier plate. Fig. 1 illustrates schematically a vacuum cleaner that comprises a housing 1 which includes a connection inlet 2 to which a vacuum cleaner hose can be connected, and an outlet aperture 3. The housing 1 forms an air-flow passageway between the hose-connector 2 and the outflow aperture 3. Mounted on the inner surface of the housing 1 is a fitting 6 which receives the edge of a screening-off plate 7 that screens-off the cross-section of the housing 1. The neck of a dust-separating, air-permeable bag 8 is sealingly connected to the screening-off plate 7 around a plate aperture 71. Also mounted in the housing 1 is an air-permeable, e.g. perforated, plate 4 which together with the fitting 6 and the screening-off plate 7 defines a bag-accommodating space 12. The dust-freed air passes through the air-permeable plate 4 and into a fan chamber 13 in which there is mounted a fan unit 5 which drives the air through the vacuum cleaner. In the case of conventional technology, it is necessary to supply or have in stock a plurality of dust separator units 7, 8 that comprise a bag 8 and a screening-off plate 7 connected thereto. The difference between the various types of bags resides mainly in the outer shape of the screening- off plate 7, which must be adapted to the fitting 6 of the model or make of vacuum cleaner concerned, so that the screening-off plate 7 will effectively screen-off the airflow passageway in the vacuum cleaner. In the case of the inventive dust separator, the bag 8 and the screening-off plate 7 are separate components, as evident from Fig. 2. In the simplest case, the screening-off plate 7 may be a plate that has been removed from a known dust separator unit 7, 8 from which the bag 8 has been removed. The inventive bag 8 includes a true dust separator bag 81 made of a flexible, air-permeable material. The orifice 82 of the bag 81 is fixedly joined to a generally annular plate or flange 83 that includes an opening or aperture 85 which corresponds generally to the aperture or opening 71 in the screening-off plate 7. The annular plate 83 is joined stably to the neck-part 82 of the bag 81, wherewith said neck-part 82 may be glued to or moulded in the plate 83. A sealing ring 84 may be mounted on the side of the plate 83 that lies proximal to the screening-off plate 7, so as to prevent air from leaking between the neck of the bag 81 and the edge of the plate opening 71. Because the actual bag 81 is thin and flexible, it can be compressed and threaded bottom-first through the plate opening 71, until the annular plate or flange 83 rests on the upper side of the screening-off plate 7 in the inlet chamber 11 between the fitting 6 and the hose-connector 2. As will be seen from Fig. 2, a diametrically extending weakening 86 is provided on the underside of the annular plate 83. It will also be seen that there is provided on the upper side of the annular plate 83 an adhesive coating 87 that extends at least around half of the circumference of said plate from the weakening 86. This adhesive coating is covered by a peelable release strip 88. When the bag 81 is full, the person using the vacuum cleaner can remove the release strip 88 and fold the annular plate 83 together around the defined, generally diametrical weakening or fold indication 86, so that the adhesive coating 87 will adhere to itself and/or to the upper side of the annular plate 83, such as to effectively seal the bag 81, as shown in Fig. 3. As shown in Fig. 4, the annular plate 83 is brought generally to a half-moon shape which enables the plate to be inserted down through the opening 81 and therewith enable the bag 8 to be completely removed from the screening-off plate 7. It will also be seen from Fig. 4 that the annular plate 83 may be provided with further weakenings or fold indications 89 that also extend conveniently diametrically across the planar surface of the plate, so as to enable the annular plate 83 to be folded one more time to a size that corresponds to half the configuration of the annular plate shown in Fig. 4. It will be understood that the illustrated embodiment can be varied and modified in different ways. For instance, the sealing element 84 can be replaced with or consist of a weakly adhesive, two-sided adhesive annulus on the underside of the annular plate 83 around the opening 85, so as to provide an adhesive connection between the adhesive plate 83 and the screening-off plate 7. It will also be evident that the annular plate 83 need not necessarily have actual weakenings or fold indications 86, 89 that extend diametrically. Instead, the breaking strength or flexural strength of the annular plate 83 may be such as to enable the person removing the bag to manually deform the plate 83 to an extent that will enable the deformed or collapsed plate to be threaded through the opening 71 in the screening-off plate 7. One important advantage afforded by the inventive bag is that one single bag design (or possibly a few bag designs) can be used in many different vacuum cleaner models that all originally required the dust separator unit 7, 8 to have a screening-off plate 7 that was designed particularly for the vacuum cleaner concerned. The inventive bag 8 can be used together with a screening-off plate 7 torn from a dust separator unit 7, 8 of a design originally intended for the vacuum cleaner/vacuum cleaner model in question. Although it has been said in the aforegoing that the bag 8 is fitted to the screening-off plate 7 by threading the bottom part of the actual bag 81 through the opening 71 in the screening-off plate 7, it will be obvious that the annular plate 83 may, instead, be collapsed or folded around a diameter for instance, and then threaded up through the opening 81 in the screening-off plate 7 and then flattened out so as to bring the annular plate 83 to the position shown in Fig. 2. Because the diameter of the opening 71 in the screening-off plate 7 is roughly the same size as the diameter of the hose connector 2 and the vacuum cleaner hose, the inner diameter of the flange can correspond to the diameter of the opening 71, therewith enabling the flange to be given the requisite stiffness and also simplifying the collapsibility of the flange .

Claims: CLAIMS 1. A dust separator (8) for a vacuum cleaner (1-6) comprising a bag (8) which is sealingly connected to a rigid screening-off plate (7) which screens-off an air-flow passageway (1) through the vacuum cleaner and has an opening (71) with which the bag (81) connects, wherein the screening plate (7) is separate from the bag (81), and wherein the bag (81) extends through the opening (71) in the screening plate (7), characterized in that the bag includes at its orifice a rigid flange (83) that functions to prevent the bag (81) from being drawn through the opening (71) in the screening plate (7) in the direction of air flow through the vacuum cleaner; and in that the flange (83) is made collapsible (86, 89) so as to enable said flange (83) to be passed through the opening (71) of the screening plate (7) when the bag is full. 2. A dust separator according to Claim 1, characterized in that the flange (83) is constructed to lie in sealing contact with the screening plate (7) around the circumference of the opening in said screening plate (7) . 3. A dust separator according to Claim 1 or 2, characterized in that the surface of the flange (83) proximal to the screening plate (7) includes sealing means (84) . 4. A dust separator according to anyone of Claims 1-3, characterized in that the flange (83) has at least one generally radial weakening or fold indication which enables the flange (83) to be folded essentially about a flange diameter. 5. A dust separator according to any one of Claims 1-4, characterized in that the side of the flange (83) distal from the screening plate (7) is provided with an adhesive means (87); and in that said adhesive means (87) is disposed to enable the bag to be sealed when the flange (83) is collapsed. 6. A dust separator according to any one of Claims 1-5, characterized in that the flange (83) includes several weakenings or fold indications (86, 89) which enable the flange (83) to be folded or collapsed about several axes. 7. A dust separator according to any one of Claims 4-6, characterized in that the flange weakening or weakenings is/are adapted to enable the flange to be folded to a size that will enable the folded flange to be threaded through the opening (71) in the screening plate (7) . 8. A dust separator according to any one of Claims 1-7, characterized in that the flange (83) can be collapsed manually. 9. A dust separator according to any one of Claims 1-8, characterized in that the actual dust-separating part (81) of the bag can be compressed to enable an unused bag to be threaded bottom-first through the opening (71) in the screening plate (7) in the direction of air flow in the vacuum cleaner. 10. A dust separator according to any one of claims 1-9, characterized in that the flange is annular.

Inventors: LILAND REIDAR, RYDIN ANDERS, LILAND, REIDAR, RYDIN, ANDERS
Applicants: LILAND REIDAR, RYDIN ANDERS, LILAND, REIDAR, RYDIN, ANDERS
Application year: 1997
Main classification: A47L9
IPC codes: A47L9