Dust bag

Abstract: Provided is a bag (54) including a number of perforations (56) comprising a continuous perforation, preferably annular in shape, with a plurality of radial perforations extending outwardly from the perimeter. The diameter of the annular perforation is substantially a comparable dimension with that of a connector opening (50). Upon insertion of a connector (32) into the bag (54), the points (52) of the connector opening make contact with the annular perforation, creating a highly-localized stress point, causing separation with only a small application of force. The radial perforations separate after connector insertion, to accommodate the connector (32) without tearing the bag. The bag is particularly applicable as a filter bag for connection to a connector portion in a vacuum cleaner.

Description: <FIELD OF THE INVENTION> The present invention relates to the field of bags for receiving a connector portion in connector systems for providing a fluid-seal. In particular, the present invention provides a bag useful as a filter bag for connection to a connector portion in a vacuum cleaner. <PRIOR ART> Fluid-tight connectors for vacuum cleaner filter bags are known. Connectors of this type are shown in US-A-4,877,432 and 5,064,455, assigned to the present assignee, the disclosures of which are hereby incorporated by reference. As shown in Fig. 1, this connector design incorporates a rigid mounting collar 10 which mounts to a cylindrical connector 12. The connector 12 is a tube with projections 14 which lock it onto the collar 10. The collar 10 is a frame having a hole 16 with outwardly extending portions (i.e. notches 18) to receive the projections 14. The hole 16 is covered by an elastic diaphragm 20, which has a generally circular opening 22. The diaphragm 20 engages the sealing surface of the connector 12 and extends over a portion of the projections 14. The entire collar 10 assembly is mounted on a vacuum cleaner bag 24. The projections 14 are inserted into the notches 18 and the connector 12 and the collar 10 are rotated with respect to each other so that the projections 14 lock onto the collar 10 to prevent it from slipping off. The diaphragm opening 22 wraps tightly around the connector 12 to prevent particle-laden air from escaping between the collar 10 and the connector 12. In order to assure a good fluid seal around the connector, the diaphragm must provide sufficient coverage over the connector's surface, and sufficient tightness of contact (as shown in Fig. 2A). However, applicants have observed that the friction and tensile force resulting from sufficient coverage and thickness for a good air seal renders the collar difficult to push onto the connector and rotate with respect to each other. As shown in Fig. 2B, there is a tendency for the diaphragm 20 to fold over onto itself during disconnection, making separation of the connector 12 difficult. These factors may pose a problem for elderly or disabled users who may lack hand strength. As shown in Fig. 5, previous-style vacuum cleaner bags typically include a number of radially-extending perforations 26, which are separated upon initial insertion of the connector 12 into the collar 10. These perforations do not easily separate, however, since the connector 12 applies a force which is transverse to the direction of separation. Thus, a large force is necessary to insert the connector 12 into the bag, which may also pose a problem for elderly or disabled users. From document US-A-5,039,324 there is known a connector system having a connector and a collar with a frame and a flexible diaphragm including a hole. For sealing the hole, even if no connector is inserted into the collar, the collar further comprises a sealing tongue having a fixed end and a free end. On the end where the connector should be inserted into the hole of the diaphragm, the connector has a design of a bowed tube which is cut substantially in a low angle with respect to the tube axis. That means, the connector has a kind of tapered end with an opening oriented quasi perpendicular to the connector axis. When inserting this connector into the collar, first the tongue has to be pressed through the hole of the diaphragm before the connector can pass the hole. From document GB-A-1 506 577 there is known a bag for vacuum cleaners, wherein a receiving portion for a connector comprises a continuous perforation around the line of the opening. Furthermore, the continuous perforation is annular, and further comprises a plurality of radially-extending perforations extending inwardly from the perimeter of the annular perforation. <SUMMARY OF THE INVENTION> In view of the above-indicated drawbacks with previous systems, there is therefore a need for a bag which preserves the air seal qualities of the previous systems, while providing improved ease of insertion and rotation during connection and disconnection, The above needs are satisfied by the present invention as defined in the claim. There is thus provided a bag for receiving a connector portion, wherein the bag comprises a continuous perforation, approximately dimensioned to correspond to a connector portion's opening, wherein the perforation is separated by contact with a connector, so as to admit the connector into the bag, and wherein the continuous perforation is annular, and further comprising a plurality of radially-extending perforations, wherein the radially-extending perforations extend outwardly from the perimeter of the annular perforation. As will be appreciated, the invention is capable of other and different embodiments, and its several details are capable of modifications in various respects all without departing from the invention. Accordingly, the drawings and description are to be regarded as illustrative and not restrictive. <BRIEF DESCRIPTION OF THE DRAWINGS> The embodiment of the invention will now be described by way of example only, with reference to the accompanying figures, wherein the members bear like reference to like numerals and wherein: Fig. 1 is a perspective view showing a previous collar and connector design. Figs. 2A and 2B are side-sectional views respectively showing the interaction between the connector and diaphragm of the previous design. Figs. 3A, 3B, 3C and 3D are views showing the various features and embodiments of a novel collar and connector. Figs. 4A and 4B are side-sectional views showing the interaction between the connector and diaphragm. Fig. 5 is an internal view showing a bag with perforation as according to a previous design. Fig. 6 is an internal view showing a bag with perforation as according to the present invention. <DETAILED DESCRIPTION OF THE INVENTION> Referring now to Figs. 3A-D and 4A-B, which are the purposes of illustrating only and not for purposes of limiting, a rigid mounting collar 30 is provided which mounts to a cylindrical connector 32, for connecting a respective hose or conduit (preferably from a flow conducting member such as a vacuum cleaner nozzle or fan exhaust) to a receiving portion (preferably a vacuum cleaner bag 54) for continuously conducting a fluid therethrough. The connector 32 is preferably a hollow tube with one or more projections 34 to lock it onto the collar 30. The collar 30 includes a frame and has a hole 36 with outwardly extending notches 38 to receive the projections 34. The connector 32 can be secured to the collar 30 through other connection devices such as e.g. a biasing member which inclines the connector 32 into engagement with the collar 30. The hole 36 is covered by an elastic diaphragm 40 having a substantially elongated opening 42 which is preferably elliptical or oval-shaped (as shown in Fig. 3A) or alternatively "peanut" shaped (as shown in Fig. 3D). The diaphragm 40 engages the sealing surface and extends over a portion of the projections 34. In the preferred embodiment, the projections 34 are inserted into the notches 38 from a facing side of the collar 30, and the collar 30 and connector 32 are rotated with respect to one another so that the projections 34 lock onto the collar 30 to prevent it from slipping off. Either the connector 32 or the collar 30 can alternately be fixed to permit the respective other to rotate. The diaphragm opening 42 wraps tightly around the connector 32 to prevent air from escaping between the collar 30 and the connector 32. In order to facilitate mounting, the connector opening 50 is scalloped, that is, made with a non-planar edge. Preferably, the scallop is a bevel with sides at a predetermined angle, preferably 90 degrees. Upon mounting, the connector 32 is inserted into the collar 30, and the "points" 52 of the scalloped connector opening 50 make contact with diaphragm 40, stretching the diaphragm 40 and causing the diaphragm edges near the longest diameter of the elongated hole 42 to slip over the opening. The remainder of the diaphragm edge follows upon further insertion so that only a small force is required to insert the connector 32 into the diaphragm 40. Upon initial insertion, the perimeter of the connector 32 makes minimal contact with the diaphragm 40, and partially overlaps the opening 50. As the connector 32 and collar 30 are rotated, an increasing portion of the diaphragm periphery is brought into contact with the connector periphery. The diaphragm 40 thus increasingly seals around the periphery of the connector 32, becoming maximum at the point of proper alignment. These design elements cooperate to reduce full contact during installation, permitting reduced force to be used in bringing the components into full connection. During mounting, only a small force is needed to rotate the collar 30 and connector 32 into position, rather than a large force as required to overcome friction in the previous connector system. However, equivalent tightness and coverage is provided upon full contact, and so the air seal of the present invention is comparable to that of previous connector systems. This also assists in removal, as a small force is needed to rotate the elements for disconnection. Also, as a portion of the diaphragm 40 overlaps the opening 50 during removal, the diaphragm 40 applies a biasing spring force against the connector 32 which further facilitates disconnection, rather than folding over as did the previous connector system. In these ways, the present invention is easier to operate than previous connector systems and thus offers considerable advantages. As seen in Fig, 6, the bag 54 of the present invention includes a number of perforations 56 comprising a continuous perforation, preferably annular in shape, with a plurality of radial perforations extending outwardly from the perimeter. The diameter of the annular perforation is substantially a comparable dimension with that of the connector opening 50. Upon insertion of the connector 32 into the bag 54, the points 52 of the connector opening make contact with the annular perforation, creating a highly-localized stress point, causing separation with only a small application of force. The radial perforations separate after connector insertion, to accommodate the connector 32 without tearing the bag. As described hereinabove, the present invention solves many problems associated with previous connector systems and presents improved versatility and operability. However, it will be appreciated that various changes in the details, materials and arrangements of parts which have been herein described and illustrated in order to explain the nature of the invention may be made by those skilled in the art within the principle and scope of the invention as expressed in the appended claim.

Claims: A bag for receiving a connector portion, wherein the bag (54) comprises a continuous perforation (56), approximately dimensioned to correspond to a connector portion's opening (50), wherein the perforation (56) is separated by contact with a connector (32), so as to admit the connector (32) into the bag (54), and wherein the continuous perforation (56) is annular, and further comprising a plurality of radially-extending perforations, wherein the radially-extending perforations extend outwardly from the perimeter of the annular perforation.

Inventors: ANDRISIN JOHN J JR, FU SHUZHEN, LACKNER JOHN R, ANDRISIN, JOHN J., JR., FU, SHUZHEN, LACKNER, JOHN R.
Applicants: SCOTT & FETZER CO, THE SCOTT FETZER COMPANY
Application year: 1998
Main classification: A47L9
IPC codes: A47L9