US3430843A

US3430843A - Disposable filter bag

Info

Publication number: US3430843A
Application number: US682205A
Authority: US
Inventors: John J Fesco
Original assignee: STUDLEY PAPER CO
Current assignee: Studley Paper Co Inc; STUDLEY PAPER CO
Priority date: 1967-11-13
Filing date: 1967-11-13
Publication date: 1969-03-04
Anticipated expiration: 1986-03-04

Description

March 4, 1969 ,1; J. FESCO 3,430,843

DISPOSABLE FILTER BAG- Fil ed NOV- 16, 1967 INVENTOR.

B MQ MM United States Patent 3,430,843 DISPOSABLE FILTER BAG John J. Fesco, Baldwin, N.Y., assignor to Studley Paper Company, Inc., Far Roclraway, N.Y., a corporation of New York Filed Nov. 13, 1967, Ser. No. 682,205 US. Cl. 22962.5 Int. Cl. B65d 31/14, 31/00, 33/00 7 Claims ABSTRACT OF THE DISCLOSURE BACKGROUND OF THE INVENTION Field of the invention This invention relates generally to a bag and more particularly to an expansible bag for use as a disposable vacuum cleaner filter bag.

Description 0] the prior art conventionally, a disposable type vacuum cleaner filter bag comprises a bag formed of a flexible air pervious filter material capable of performing the separating operation in order to remove the dust and debris from the air stream in which it is entrained, The bag must be capable of withstanding the strain imposed thereon during the operation of the suction cleaner, as well as the weight of the waste material entrapped therein.

In order to promote the efficiency of this type bag, it is highly desirable that a maximum filter surface area be presented in order to accomplish the separation function. Moreover, in Order to reduce the requirement of frequent replacement and also to reduce the cost of the same, it is highly desirable that the bag or receptacle present as large a volume, for receiving the waste material, as possible.

An additional feature found to be desirable in vacuum filter bags is that such bag conform itself as closely as possible to the configuration of the housing or receptacle within which it is disposed during use, in order to utilize the available space at maximum efiiciency. This requirement has become increasingly important in view of the tendency to reduce the overall size of the vacuum cleaning apparatus and the often asymmetrical configuration of the space within which the bag is disposed. The desire for compactness often results in a design wherein the configuration of the space provided for the bag does not conform to conventional bag shapes and may include projections in the interior of the bag receiving compartments which require substantial distortion of the bag shape, particularly when distended in use.

SUMMARY OF THE INVENTION It is therefore among the principal objectives of this invention to provide a bag having the aforenoted desirable features.

In accordance with the present invention there has now been provided a bag, suitable for use as a vacuum cleaner filter bag, comprising a sheet of flexible material having a pair of opposing side edges, one of said side edges being provided with a plurality of pleats, including a face pleat,

formed thereon, the other side edge being provided with a face panel, said sheet being transversely folded medially of its length, the confronting panels of the face pleat and face panel being joined together, said pleats being laterally distensible along said transverse fold, whereby a bag is formed which is resultingly olf-centerly expansible. In order to form the vacuum cleaner filter bag, the confronting pleated ends and opposing face panel ends of said sheet are folded over upon themselves to thereby secure said pleats against lateral displacement along that end of the bag, the pleated edges being held in pleated condition only by the bight along said transverse fold at the other end of the bag.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be hereinafter more fully described with reference to the accompanying drawing in which:

FIGURE 1 is a perspective 1 view of the invention vacuum cleaner filter bag in completed form.

FIGURE 2 is a view in cross-section taken along line 22 of FIGURE 1.

FIGURE 3 is a view in perspective of the subject filter bag except that the bag is shown in the expanded condition, as by mounting in a suitable vacuum cleaner and connected to the air-inlet thereof, the air-inlet being shown by phantom lines.

FIGURE 4 is a reduced, fragmented view in perspective of the blank, from which the bag comprising the invention is formed, in the process of being folded over to form a folded bottom for the bag.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to the figures of the drawing, the bag in accordance with the present invention is off-centerly expansible and is formed of a blank 10 (FIGURE 4), said blank comprising an elongated sheet of material, such as flexible porous paper, normally employed for disposable filter bags, and having opposing longitudinal side edges 12 and 14. Side edge 14 has an inwardly directed face panel 16, while side edge (12 is formed into a plurality of

pleats

20, 22, 24 and 26 by means of re-entrant folds which rest against fiat body 30 of the blank. The

apices

21, 23, 25 and 27 of the respective pleats extend along the side edge 12 of the blank in step-wise fashion, with the shortest marginal extension being at apex 21 and the longest at 27, 23 and 25 being intermediate thereof, 25 being longer than 23, for a reason to be further explained. Face panel 32 of face pleat 26 is inwardly directed and is of a narrower width than side pleat 26. The exposed surfaces of

face panels

16 and 32 have deposited thereon longitudinally extending adhesive stripes 34. As shown in FIGURE 4, the blank 10 is folded upon itself, along transverse fold line 36 medially of the length of the blank, so that the respective halves of the blank are brought into confronting relationship and form opposing

fiat face Walls

38 and 40 for the bag structure. Adhesive contact is made between the opposing halves of the exposed surfaces of the said face panels so that there is thus formed a bag structure having a folded bottom end and an open mouth at its terminal end. This can readily be seen by referring to FIGURE 4 wherein the blank 10 is shown folded upon itself and when the adhesive stripes 34 make contact, a bag is formed having an open mouth, as aforesaid. By viewing FIGURE 2, especially, it can be seen that

pleats

20, 22, 24 and 26

form gussets

42, 44 and 46, rsepectively. The bag is readily exp ansible by manually grasping, if desired, the pleat edges 50'. This action causes the pleated side to unfold and open thereby, laterally oif-centerly extending the bag wall to form a relatively large bag of generally right-triangular configuration.

When the bag is intended for vacuum cleaner use, in a preferable embodiment of the invention, opening means 60 (FIGURES 1 and 3) are provided in one of the face walls as wall 38. Opening means 60 are effected by means of a plurality of cuts 62 in said wall 38, which cuts generally conform to a star-shape, the lines of said cuts intersecting in the approximate center of said means 60. The opening means 60 are surrounded by a collar 64 to provide a suitable mounting means for the air-inlet (phantom lines), fitting of a suitable vacuum cleaner (not shown) and to provide access into the interior of the bag. The open end 66 of the bag is completely sealed by providing transverse

adhesive stripes

68, 70, 72 and 74 on the open end so that when the top edge thereof is twice folded over upon itself as shown at 76 in FIGURE 1, said end of the bag is completely sealed and the terminal portions 78 of the pleats and opposing side edge 14 are interfolded and thereby confined against displacement or unfolding movement in a lateral direction, such sealing being accomplished by known conventional means. It will be noted, however, that the pleats along the folded bottom 80 of the bag are retained only by the bight of the transverse fold 36, so that they are thus adapted to be expansible.

When the vacuum cleaner filter bag 82 is placed into a suitable vacuum cleaner (not shown) the bag may be manually distended, as aforementioned, which is preferable; however, this is not necessary since the bag is automatically distended by the force of the dirt-laden air entering the interior thereof, as shown in FIGURE 3, in the direction of the arrows, by means of air-inlet 84. Thus, the bag 82 has the ability to conform itself to the interior configuration of the vacuum tank. As shown in FIGURE 3,

gussets

42, 44 and 46 are still defined, however, it is clear that when the bag substantially balloons out, that these would substantially disappear. With regard to the stepwise graduation of

apices

21, 23, 25 and 27 (mentioned above) this provides for easier manual and/ or automatic distension of the off-center expansion capacity of the bag 82.

Having thus described the invention as applied to specific embodiments, it is to be understood that various changes may be made by those skilled in the art without departing from the spirit and scope thereof.

What is claimed is:

1. A disposable vacuum cleaner filter bag comprising a sheet of flexible material having a pair of opposing side edges, one of. said side edges being provided with a plurality of pleats, including a face pleat, formed thereon, the other said side edge being provided with only a face panel, said sheet being transversely folded medially of its length, the resulting confronting panels of the face pleat and face panel being respectively joined together, said pleats being laterally distensible along said transverse fold, the confronting pleated ends and opposing face panel ends of said sheet being folded over upon themselves thereby securing said pleats against lateral distension along that end of said bag, the pleated edges at the other end of said bag being only foldingly secured, whereby said bag is resultingly adapted to be off-centerly expansible.

2. A Ibag according to claim 1 wherein the apices of said pleats extend outwardly in graduated stepwise relationship with the apex of said face pleat extending the furthest.

3. A bag comprising a sheet of flexible material having a pair of opposing side edges, one of said side edges being formed into a plurality of re-entrant folds disposed against the fiat body of the sheet to provide pleated side edges therefor, said pleated edges including a face panel, the other side edge being provided with only a face panel, the exposed surfaces of said face panels having an adhesive substance applied thereto, said sheet being folded upon itself along a transverse fold line medially of its length, the respecting halves of said sheet and face panels being in confronting relation, and being adhesively secured respectively to each other, the pleated side edges of said sheet being only foldingly secured along said fold line, said bag thereby being adapted to be off-centerly expansible.

4. A bag according to claim 1 wherein said face panels are inwardly directed.

5. A bag according to claim 3 wherein said face panels are inwardly directed.

6. A bag according to claim 3 wherein said pleated edges extend outwardly in graduated stepwise relationship with the edge formed by the face panel extending the furthest.

7. A bag according to claim 1 wherein said pleats form a plurality of gussets.

References Cited UNITED STATES PATENTS 2,961,063 11/1960 Fesco 381 3,297,231 1/1967 Fesco 22953 3,361,334 l/1968 Terzuoli 22953 1,625,968 4/1927 Ware 22953 DAVID M. BOCKENEK, Primary Examiner.

US. Cl. X.R. 55-376; 22953