GB2033248A

GB2033248A - End Plate for a Suction Cleaner Filter Bag

Info

Publication number: GB2033248A
Application number: GB7936756A
Authority: GB
Original assignee: Vorwerk and Co Interholding GmbH
Current assignee: Vorwerk and Co Interholding GmbH
Priority date: 1978-11-04
Filing date: 1979-10-23
Publication date: 1980-05-21
Also published as: IT7936159V0; DE7832780U1; FR2440182A1; FR2440182B3; ES246576U; IT1119896B; ES246576Y; JPS5564819A; SE7909077L; GB2033248B; JPS5920816U; IT7950711A0

Abstract

An end plate (2) for a suction cleaner filter bag (13) is provided with an opening for accommodating a suction tube (6), the opening having a peripheral packing (1) for sealing engagement with the suction tube. The packing (1) is fixed on the plate (2) and, in order to enable the filter bag to be replaced whilst retaining a good sealing action around the suction tube (6), the packing (1) is made of a foamed elastomeric material. The packing may be extended by a flap (9) to protect the inside of bag (13) from tube (6). <IMAGE>

Description

SPECIFICATION Holding Plate for a Suction Cleaner Filter Bag This invention relates to a holding plate for a suction cleaner filter bag.

Such holding plates are known in which the plate is formed with an opening for accommodating a suction tube of the suction cleaner, the opening comprising a peripheral packing so as to provide a passage of a smaller cross-section than the cross-section of the suction tube. The packing is made from thin foils which have low elasticity and high expansion.

However, these packings have a serious disadvantage. It is certainly the case that, with the fitting of the filter bag, the packing, due to its irreversible deformation, is given a good seating against the sucton tube, but the slightest movement of the holding plate on the suction tube causes one side of the packing to become detached and no longer tight, since the packing is not elastic and is unable to follow the movement.

According to the present invention, there is provided a holding plate for a suction cleaner filter bag, the plate being provided with an opening for accommodating a suction tube of the cleaner, the opening having a peripheral packing for sealing engagement with the suction tube, the packing being fixed on the holding plate and consisting of foamed elastomeric material.

For a better understanding of the invention, reference will now be made, by way of example, to the accompanying drawings, in which.~ Figure 1 is a diagrammatic plan view of a holding plate with a packing fixed thereon, Figure 2 is a diagrammatic, sectional view of a holding plate with attached filter bag, the holding plate being pushed onto a suction tube of a suction cleaner, Figure 3 shows the detail X of Figure 2 to a larger scale, Figure 4 shows the detail X of Figure 2 to a larger scale but just as if the holding plate were to have been moved from the position shown in Figure 2, and Figure 5 is a view similar to Figure 2 but showing a holding plate with a flap formed on the packing.

Figure 1 shows a holding plate 2 without a paper filter bag, which is normally stuck thereon.

The holding plate 2 comprises two projections or lugs 10 and 1 1, which serve for fixing the plate about the neck of a suction tube of a suction cleaner. The plate 2 has an opening 5 through which the suction tube is intended to pass, a plate 3, consisting for example of foamed synthetic plastics material, being provided in the region of the opening 5, the plate 3 being secured to the plate 2.

It will be seen from Figure 2 that when a suction tube 6 is pushed in through the opening 5, the plate 3 forms a packing 1. The holding plate 2 is fitted with its lug 1 1 into an opening 12 of the suction cleaner body and then pushed over the suction tube 6. The plate 3 becomes inverted by this action to form the packing 1 and seals off the leading of the suction tube 6. A paper filter bag 13 is shown stuck on the plate 2.

As more clearly shown in Figure 3 the thickness 4 of the plate 3 is greater than half the difference between the diameter of the opening 5 in the holding plate 2 and the diameter of the suction tube 6. As a result, the space between the suction tube 6 and the holding plate 2 is completely filled and, in addition, the foamed material is squeezed, since it is thicker than the space it fills. In this way, a good seal is established.

Figure 4 illustrates what happens when the situation occurs that tolerances are too large or the holding plate 2 becomes shifted relatively to the suction tube 6; As can be seen the suction tube 6 is seated offcentre in the opening 5 of the holding plate 2.

Nevertheless, the packing 1 has a sealing action.

Due to the elasticity of the foamed material, the packing 1 is squeezed on one side between the holding plate 2 and the suction tube 6 and, nevertheless, the packing 1 is still applied against the suction tube 6 on the other side.

Figure 5 shows a possible modification in which a flap 9 is arranged on the packing 1 , the flap 9 being unitary with the plate 3. This flap 9 can, for example, be very easily produced by the fact that, when stamping out the passage opening in the plate 3, the opening is not stamped out over its entire circumference. As a result, the flap 9, which is circular, remains connected to the plate 3.

The flap 9 acts as a protection for the paper filter bag 13, if it should be bent inwardly, by preventing it from being torn by the suction tube 6 when the bag is pushed onto the suction tube 6, since the flap 9 lies between the bag 13 and the tube 6. Also, the flap 9 closes the opening in the plate 3 when the bag 13 (attached to the plate 2) is removed, thus protecting the user from the possibility of dust falling out of the bag 13.

In all cases, the packing 1 is formed of foamed, elastomeric material, the packing extending peripherally around the opening 5 for sealing engagement with the suction tube 6. The packing can consist of soft to semi-hard foamed material and can consist of foamed rubber or caoutchouc material or of foamed thermoplasts. The material may have either an open-cell or closed-cell structure. The plate 3 forming the packing should advantageously have a thickness from 1 to 5 mm.

When the material is of foamed thermoplasts, the density should be between 20 kg/m3 and 50 kg/m3. The plate 3 can consist of cross-linked, foamed thermoplasts.

It will be appreciated that the plate 3 should have a smooth, closed surface on the side which faces the holding plate 2.

Claims

1. A holding plate for a suction cleaner filter bag, the plate being provided with an opening for accommodating a suction tube of the cleaner, the

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Holding Plate for a Suction Cleaner Filter Bag This invention relates to a holding plate for a suction cleaner filter bag. Such holding plates are known in which the plate is formed with an opening for accommodating a suction tube of the suction cleaner, the opening comprising a peripheral packing so as to provide a passage of a smaller cross-section than the cross-section of the suction tube. The packing is made from thin foils which have low elasticity and high expansion. However, these packings have a serious disadvantage. It is certainly the case that, with the fitting of the filter bag, the packing, due to its irreversible deformation, is given a good seating against the sucton tube, but the slightest movement of the holding plate on the suction tube causes one side of the packing to become detached and no longer tight, since the packing is not elastic and is unable to follow the movement. According to the present invention, there is provided a holding plate for a suction cleaner filter bag, the plate being provided with an opening for accommodating a suction tube of the cleaner, the opening having a peripheral packing for sealing engagement with the suction tube, the packing being fixed on the holding plate and consisting of foamed elastomeric material. For a better understanding of the invention, reference will now be made, by way of example, to the accompanying drawings, in which.~ Figure 1 is a diagrammatic plan view of a holding plate with a packing fixed thereon, Figure 2 is a diagrammatic, sectional view of a holding plate with attached filter bag, the holding plate being pushed onto a suction tube of a suction cleaner, Figure 3 shows the detail X of Figure 2 to a larger scale, Figure 4 shows the detail X of Figure 2 to a larger scale but just as if the holding plate were to have been moved from the position shown in Figure 2, and Figure 5 is a view similar to Figure 2 but showing a holding plate with a flap formed on the packing. Figure 1 shows a holding plate 2 without a paper filter bag, which is normally stuck thereon. The holding plate 2 comprises two projections or lugs 10 and 1 1, which serve for fixing the plate about the neck of a suction tube of a suction cleaner. The plate 2 has an opening 5 through which the suction tube is intended to pass, a plate 3, consisting for example of foamed synthetic plastics material, being provided in the region of the opening 5, the plate 3 being secured to the plate 2. It will be seen from Figure 2 that when a suction tube 6 is pushed in through the opening 5, the plate 3 forms a packing 1. The holding plate 2 is fitted with its lug 1 1 into an opening 12 of the suction cleaner body and then pushed over the suction tube 6. The plate 3 becomes inverted by this action to form the packing 1 and seals off the leading of the suction tube 6. A paper filter bag 13 is shown stuck on the plate 2. As more clearly shown in Figure 3 the thickness 4 of the plate 3 is greater than half the difference between the diameter of the opening 5 in the holding plate 2 and the diameter of the suction tube 6. As a result, the space between the suction tube 6 and the holding plate 2 is completely filled and, in addition, the foamed material is squeezed, since it is thicker than the space it fills. In this way, a good seal is established. Figure 4 illustrates what happens when the situation occurs that tolerances are too large or the holding plate 2 becomes shifted relatively to the suction tube 6; As can be seen the suction tube 6 is seated offcentre in the opening 5 of the holding plate 2. Nevertheless, the packing 1 has a sealing action. Due to the elasticity of the foamed material, the packing 1 is squeezed on one side between the holding plate 2 and the suction tube 6 and, nevertheless, the packing 1 is still applied against the suction tube 6 on the other side. Figure 5 shows a possible modification in which a flap 9 is arranged on the packing 1 , the flap 9 being unitary with the plate 3. This flap 9 can, for example, be very easily produced by the fact that, when stamping out the passage opening in the plate 3, the opening is not stamped out over its entire circumference. As a result, the flap 9, which is circular, remains connected to the plate 3. The flap 9 acts as a protection for the paper filter bag 13, if it should be bent inwardly, by preventing it from being torn by the suction tube 6 when the bag is pushed onto the suction tube 6, since the flap 9 lies between the bag 13 and the tube 6. Also, the flap 9 closes the opening in the plate 3 when the bag 13 (attached to the plate 2) is removed, thus protecting the user from the possibility of dust falling out of the bag 13. In all cases, the packing 1 is formed of foamed, elastomeric material, the packing extending peripherally around the opening 5 for sealing engagement with the suction tube 6. The packing can consist of soft to semi-hard foamed material and can consist of foamed rubber or caoutchouc material or of foamed thermoplasts. The material may have either an open-cell or closed-cell structure. The plate 3 forming the packing should advantageously have a thickness from 1 to 5 mm. When the material is of foamed thermoplasts, the density should be between 20 kg/m3 and 50 kg/m3. The plate 3 can consist of cross-linked, foamed thermoplasts. It will be appreciated that the plate 3 should have a smooth, closed surface on the side which faces the holding plate 2. Claims

1. A holding plate for a suction cleaner filter bag, the plate being provided with an opening for accommodating a suction tube of the cleaner, the opening having a peripheral packing for sealing engagement with the suction tube, the packing being fixed on the holding plate and consisting of foamed elastomeric material.

2. A plate as claimed in claim 1, wherein said packing consists of foamed natural or synthetic rubber material.

3. A plate as claimed in claim 1, wherein said packing consists of foamed thermoplastic material.

4. A plate as claimed in claim 1, 2 or 3, wherein said foamed elastomeric material is of open-celled structure.

5. A plate as claimed in claim 1, 2 or 3, wherein said foamed elastomeric material is of closed-cell structure.

6. A plate as claimed in any one of the preceding claims, wherein said packing is formed be a deformable plate secured to said holding plate, the packing plate itself having an opening corresponding to the opening in the holding plate.

7. A holding plate as claimed in claim 6, wherein said packing plate is 1 to 5 mm thick.

8. A holding plate as claimed in claim 6 or 7 as appended to claim 3, wherein said packing plate consists of a foamed thermoplast which has a density between 20 kg/m3 and 50 kg/m3.

9. A holding plate as claimed in claim 6, 7 or 8, wherein said packing plate has on its side that is secured to the holding plate, a smooth, closed surface.

10. A holding plate as claimed in claim 6 or 7 as appendent to claim 3, wherein said packing plate consists of cross-linked, foamed thermoplasts.

11. A holding plate as claimed in any one of claims 6 to 10, wherein the opening in said packing plate has arranged therein a movable flap which is unitary with the packing plate.

12. A holding plate for a suction cleaner filter bag, substantially as hereinbefore described with reference to Figures 1 to 4, with or without the modification of Figure 5 of the accompanying drawings.

13. A combination of a holding plate as claimed in any one of the preceding claims and a suction cleaner having a said suction tube.

14. A combination as claimed in claim 13, with the holding plate being as claimed in any one of claims 6 to 12, wherein the thickness of said packing plate is greater than half the difference between the diameter of the opening in said holding plate and the outer diameter of said suction tube.

15. A combination as claimed in claim 13 or 14, substantially as hereinbefore described with reference to Figures 1 to 4, with or without the modification of Figure 5 of the accompanying drawings.