US2751041A - Filter bag - Google Patents

Filter bag Download PDF

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Publication number
US2751041A
US2751041A US355805A US35580553A US2751041A US 2751041 A US2751041 A US 2751041A US 355805 A US355805 A US 355805A US 35580553 A US35580553 A US 35580553A US 2751041 A US2751041 A US 2751041A
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US
United States
Prior art keywords
filter
inlet
pleats
web
bag
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US355805A
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English (en)
Inventor
William D Cropley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoover Co
Original Assignee
Hoover Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to NL91193D priority Critical patent/NL91193C/xx
Priority to NLAANVRAGE7809526,A priority patent/NL187642B/nl
Priority to BE528940D priority patent/BE528940A/xx
Priority to US355805A priority patent/US2751041A/en
Application filed by Hoover Co filed Critical Hoover Co
Priority to GB14267/54A priority patent/GB750750A/en
Priority to FR1105257D priority patent/FR1105257A/fr
Priority to DEH20299A priority patent/DE1143308B/de
Priority to CH324168D priority patent/CH324168A/fr
Application granted granted Critical
Publication of US2751041A publication Critical patent/US2751041A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
    • A47L9/14—Bags or the like; Rigid filtering receptacles; Attachment of, or closures for, bags or receptacles

Definitions

  • the present filter bag design has been found highly successful in meeting these and numerous other requirements to a degree not heretofore approached and by a novel construction and arrangement of parts never before suggested. In essence this has been accomplishedin the present invention by passing a web of filter paper through a tubing andpleating machine of generally conventional design.
  • the resulting pleated cylindrical tube is 'cut'into section of the desired length for individual filter bags.
  • the top end is sealed closed while the inlet end is cut off on the bias.
  • These pleats are then flattened against one another and stitched to the longer unpleated web of the tube to form a small diameter inlet opening to receive the suction cleaner adapter tube.
  • a primary object of the present invention is the provision of a novel disposable paper filter for use on suction cleaners and the like.
  • a further object is the provision of a paper filter construction which can be manufactured at high speed by automatic machinery with a minimum of handling by hand labor.
  • Yet another object is the provision of a filter which is folded fiat and compactly as manufactured and which opens readily when installed on a cleaner into a cylindrical tube of large area and high dirt storing capacity.
  • Still another object is the provision of a novel mode of pleating a filter bag to provide a large dirt collecting pocket to one side of the inlet opening and removed from the incoming dirty air stream when the bag is installed on a cleaner.
  • Another object is the provision of a new and simplified mode of forming the air inlet without the use of reinforcing materials and expedients considered essential to prior designs.
  • Still aonther object is the provision of a new and improved filter assembly for use on a floor type suction cleaner.
  • a further object is the design of the filter inlet in such manner that the projecting and overlapping pleats provide a reinforced pilot for guiding the adapter into the filter inlet during its assembly to the cleaner.
  • Yet another object of the invention is the provision of a new and simple method of constructing a filter bag.
  • Figure 1 is a side elevational view partly in section of a floor type suction cleaner using my unique filter bag
  • Figure 2 is a perspective view of the filter bag in readiness for assembly on a suction cleaner and showing the inlet expanded to its full diameter;
  • Figure 3 is a sectional view through the body of the filter taken along line 33 on Figure 2;
  • Figure 4 is a sectional view along line 44 on Figure 6 and showing the position of the dirt valve member
  • Figure 5 is a schematic view of the automatic tubing and pleating machine utilized in the manufacture of the filter.
  • Figure 6 is a perspective view of the completed filter folded flat ready for packaging.
  • FIG. 1 it will be seen that the invention is shown as incorporated in a floor type suction cleaner having a main body generally designated 10.
  • An electric driving motor enclosed within the body by a hood 11 has an axis extending generally horizontally lengthwise of the body.
  • the forward end of its shaft opens'into a suction fan chamber having an exhaust air outlet 12 projecting laterally from the near side of the cleaner body as viewed in Figure 1.
  • This fan has a centrally disposed inlet opening in its forward wall which is in communication with the usual suction air passageway leading into the downwardly facing suction nozzle 13.
  • the cleaner body is supported on a pair of front carrier wheels 14 and a pair of rear wheels 15 in a well known manner.
  • the suction nozzle is preferably provided with a rotary agitator driven by a belt coupled to a pulley at the forward end of the motor shaft.
  • This pulleyand belt are accessible for servicing through a removable cover plate 16 at the forward end of the cleaner body.
  • the cleaner is propelled across the floor by a handle
  • the filter assembly comprises a filter adapter tube 21 projecting rearwardly from the discharge end of a soft Since this mechanism forms no part of the present invention, it need not be described in detail.
  • bellows 22 The lower end of bellows 22 merges with an elbow portion having an inlet passage 23 projecting transversely of the cleaner body and including any suitable means for detachably-coupling the same to the outer end of exhaust air passageway 12.
  • the 'inlet end of elbow 23 is shown as nonrotatably mounted on the end of the exhaust but it will be understood that it may include a pivoting type coupling if desired.
  • the bellows portion 22, however, is thin walled and very flexibleparticularly in a vertical plane. As a consequence, adapter tube 21 pivots readily and follows tie movement of the propelling handle as the same pivots about pins 19 in the use of the cleaner.
  • Adapter tube 21 is generally cylindrical and is provided with an annular depression 2 in which the resilient garter spring 25 is adapted to seat for the purpose of clamping the inlet end of the paper filter bag to the adapter.
  • This spring rolls readily along tube 21 to a position at the base of the adapter in which position it is clear of the lowermost end of the filter bag. After the filter bag has been positioned on the adapter, the spring can be rolled up over the end of the filter and into depression 24 where it remains so long as the cleaner is in use and wherein it effectively seals the filter inlet to the adapter tube.
  • the upper end of adapter 21 is rolled inwardly at 26 to facilitate the assembly of the filter inlet thereover.
  • Tube 21 may be flared outwardly at 27 so as to interlock with an interior channel in the upper end of bellows 22.
  • Tube 21 may also be provided with a plurality of openings through which studs 28 on the bellows project for the purpose of locking the tube assembled to the bellows.
  • the filter assembly also includes an outer appearance bag 29 of porous fabric, or the like. Bag 29 conceals the adapter and the filter bag proper and also acts as a protective covering for the paper filter bag.
  • the lower end of the appearance bag surrounds the rubber bellows 22 and may be secured to the inlet elbow 23 of the adapter assembly.
  • the appearance bag is provided with a suitable closure such as a hookless fastener extending lengthwise of the bag and through which access is provided to the adapter assembly and to the filter bag.
  • the upper end of the appearance bag is preferably closed and supported from the upper end of the propelling handle by the usual tension spring 29a.
  • the appearance envelope is so tailored as to enclose a rather large space on the underside of the adapter.
  • the adapter is arranged to lie along the upper side of envelope 29 since it is designed for use with my novel paper filter having a large dirt storing pocket extending along its lower side and below the under side of the adapter.
  • the disposable filter itself and the general type of equipment used in its manufacture is illustrated in Figures 2 to 6, inclusive.
  • One of the finished filter bags 30 is best illustrated in Figure 2. It comprises a cylindrical tubular body formed by a lower relatively narrow connecting web 31, an upper, somewhat wider connecting web 32 and two sets of pleats 33 extending along its opposite sides the full length of the filter.
  • the arrangement of the unpleated webs and the interconnecting pleats is best shown in Figure 3.
  • the interior crease lines 34 of each set of pleats as well as the exterior crease lines 35 are spaced at progressively greater distances from a vertical plane extending along the longitudinal axis of the filter.
  • creases 34 are closest to this plane adjacent connecting web 31 and at the greatest distance from this plane adjacent web 32.
  • exterior crease lines 35 Accordingly, the pleats may be aptly described as arranged in echelon.
  • the pleats are folded flat against one another at the opposite ends of the filter.
  • the folds of paper at creases 34 and 35 unavoidably bulks larger than two thicknesses of the filter paper itself.
  • the echelon arrangement of the pleats provides a gradual change from the single thickness of the paper in webs 31 and 32 to the maximum thickness of a flattened set of the pleats. This will be best understood by reference to Figures 2 and 4. Referring to Figure 4, note that the thickness of the filter inlet increases gradually from the scam in the center of web 31 as one advances circumferentially in either direction from this point along the interior rim of the inlet.
  • the gradual change in thickness of the pleated inlet greatly reduces the tendency of the inlet to tear at the junction of web 32 with the pleated lower half of the inlet. It is also a simple matter to provide an effective and air tight seal between the filter inlet and the adapter tubeparticularly, in the area between the juxtaposed edges of creases 34, 34.
  • a large roll of air pervious filter paper 36 is suitably supported on a shaft 37 at one end of a well known type of tubing and pleating machine generally designated 38. It will, of course, be appreciated that these machines are commercially available in a variety of forms and operate to crease and pleat the sheet of paper stock as it is advanced through the machine.
  • the paper web 39 from roll 36 is fed through suitable guide and tensioning rolls 40 and into the pleating machine 38. It has been found that a roll of paper stock 31 inches wide provides a pleated filter bag of a desirable circumference for use on floor type suction cleaners and having the desired dirt storage capacity and filtering area.
  • a strip of glue 41 may be applied to one edge of the web by a fountain feed device 42.
  • This valve has other functions including that of constraining the flow of incoming dirty air to the upper portion of the bag and preventing it from stirring up dirt already collected in the lower end of the filter bag.
  • the dirt valve is formed very simply by inserting a rectangular piece of paper 47 into the flattened inlet end of the filter bag.
  • the width of the valve member is slightly less than the flattened inlet end of the tube so that it can be easily telescoped into the inlet.
  • the lower end of this valve is held depressed against the pleats and web 31 and is secured thereto by stitching 46 or, if preferred, by strips of glue applied along its side edges as well as across its lower edge on the side facing the pleats.
  • the lower end of the valve may be rounded to conform in shape with the rounded end 44 of the pilot portion of the inlet or square cut as illustrated in Figure 6.
  • the free upper end of the valve extends upwardly into the body of the filter bag to a point appreciably above the end of the adapter tube 21. From the foregoing it will be apparent that the lower end of the valve provides a cover for the lowermost end of the pleats as well as a smooth slide surface which facilitates the insertion of the filter bag over the end of the adapted tube 21 during its assembly to the cleaner.
  • T he'operator first opens the hookless closure extending along the side of appearance bag 29. Using her left hand, the operator then grasps the flattened filter inlet across the top side of Web 32 and squeezes the opposite edges toward one another to expand the inlet to the shape shown in Figure 2. The projecting ends of the pleats and web 31 then provide a pilot for guiding the inlet over the upper end of adapter tube 21 as it is held in alignment with the inlet by the right hand. During this operation the garter spring 25 is located at the base of the adapter tube.
  • the air gradually opens the bag until the pleats throughout the body of the bag are fully expanded.
  • the adapter tube will, of course, lie against the inner wall of the top web 32 while the lower half of the bag will expand downwardly as clearly indicated in Figure 2 to provide a large dirt collecting pocket underlying the adapter tube and dirt trap 47.
  • the supporting spring connecting the upper end of the filter assembly to the propelling handle will cause the entire assembly to pivot with the handle as the cleaner is propelled over the floor. All the flexing in the filter assembly will be confined to flexible bellows 22 to the lower end of the appearance bag with the result that there is no flexing in the filter bag itself.
  • the cleaner may be used until at least the lower half of the filter bag is filled with dirt. If a much larger quantity of dirt is collected the filtering efliciency of the filter bag will decrease considerably and it is desirable to replace the filter with a fresh one. This is accomplished by opening the appearance bag, rolling the garter spring downwardly to the base of the adapter and then withdrawing the filter bag. In this operation, dirt trap 47 will prevent any dirt from escaping through the inlet and the latter may be closed by flattening web 32 against the lower half of the inlet as the bag is carried to a place of disposal. A new filter is then installed in the manner described above and the cleaner is ready for continued operation.
  • a non-reusable paper filter bag for use on a suction cleaner comprising, a main tubular body formed from air pervious paper material with a pair of opposite substantially flat walls, said body having a plurality of pleats extending along diametrically opposed sides of said body for the full length thereof intermediate said walls, said pleats forming inner and outer staggered creases throughout their lengths, means permanently closing the upper end of said body with the upper ends of said pleats flattened against one another, the lower end of said body having an air inlet opening of such size as to mate with and closely engage in air tight sealing relationship a filter adapter of the suction cleaner, one side of said inlet being formed by one of said flat walls and the remainder being formed by the remaining peripheral lower edge portion of said body including flattened lower ends of said pleats arranged in staggered relation so that the inner creases are offset with respect to each other at said inlet.
  • a non-reusable paper filter bag as defined in claim 1 including means for securing the lower ends of said pleats flattened against the other flat wall of said body.
  • a paper filter bag for use on a suction cleaner comprising, a single rectangular sheet of air pervious paper, the opposite longer edges of said sheet being joined together to form a tube, the walls of said tube being folded to form two sets of pleats extending lengthwise thereof on the opposite sides of the tube, said pleats forming inner and outer staggered creases, said sets of pleats being interconnected by a pair of unpleated webs adapted to lie in closely spaced parallel planes when said pleats are collapsed together, means closing one end of said tube with said pleats collapsed, said filter bag having an inlet opening at its opposite end, said inlet opening being formed in part by one of said unpleated webs and in part by a portion of the end of the other of said unpleated webs and by adjacent flattened ends of said pleats arranged in staggered relation so that the inner creases are offset with respect to each other, said inlet being of such size as to mate with and closely engage in air tight sealing relationship a filter adapter of the cleaner.
  • a paper filter bag as defined in claim 3 including a panel of thin flexible material located in said inlet opening and cooperating with the inner walls of said filter to form a dirt trap, said panel being shaped so as to be readily received with said inlet opening with its inner end extending toward the closed end of said filter, and means securing the lower end of said panel to the rim of said inlet opening on the side thereof formed by said flattened pleats and one of said webs.
  • a paper filter bag as defined in claim 3 in which the inlet end of said filter is cut on the bias and so that the side thereof formed by said flattened pleats and together with one of said webs projects further than the other side of said inlet to provide a relatively stiff pilot for guiding a filter adapter tube into said inlet opening.
  • a paper filter bag comprising, an elongated tube formed of air pervious paper, said tube having a plurality of pleats extending along its opposite lateral sides interconnected by upper and lower unpleated webs, the upper web being wider than said lower web, the pleats at one end of said tube being arranged in staggered relation so that the creases of said pleats are offset with respect to one another, and means extending cross-wise of the end of said filter for securing said staggered pleats against displacement and for holding the same flattened against the end of said narrow web whereby the same cooperate with the adjacent end portion of said wider web to provide a tubular inlet for said filter, said inlet being of such size as to mate with and closely engage in air tight sealing relationship a filter adapter of the cleaner.
  • a paper filter bag for use on a suction cleaner comprising, a single piece of air pervious paper forming an elongated tube having an inlet at one end, a set of pleats extending along the opposite sides of said tube interconnected by upper and lower unpleated webs, the creases forming the pleats in each of said sets being offset from one another in echelon formation whereby said creases are offset from one another when said pleats are flattened against one another, the upper of said webs being shorter than the other and shorter than said pleats at the inlet end of said tube, the pleats of each set being flattened against one another and against an end of said lower, longer web, and means securing said flattened pleats t0 the end of said lower web so as to form the lower side of a tubular inlet for said filter, said inlet being of such size as to mate with and closely engage in air tight sealing relationship a filter adapter of the cleaner.
  • a disposable paper filter for use on a suction cleaner and formed from a single piece of air pervious paper, said filter comprising an elongated paper tube having an inlet at one end, said tube having two sets of pleats extending lengthwise thereof at its opposite lateral sides, all portions of said pleats being spaced from the opposite sides of a vertical plane extending through the longitudinal axis of said tube, the pleats in each set being arranged in echelon O c: formation so that the creases thereof are offset from one another when the same are flattened against one another, upper and lower unpleated webs of paper interconnecting said sets of pleats, the upper of said Webs being shorter than said lower web and shorter than said pleats, and means for securing the ends of each of said pleats to the end of said lower web whereby the same cooperates with the adjacent end ofsaid upper web to provide a tubular inlet at one end of said filter bag, said inlet being of such size as to mate with and closely engage in air tight sealing relationship a

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filters For Electric Vacuum Cleaners (AREA)
US355805A 1953-05-18 1953-05-18 Filter bag Expired - Lifetime US2751041A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
NL91193D NL91193C (nl) 1953-05-18
NLAANVRAGE7809526,A NL187642B (nl) 1953-05-18 Geleidings- en plaatsingsmechanisme voor het kleipistool van een stopmachine voor het afsteekgat van een schachtoven.
BE528940D BE528940A (nl) 1953-05-18
US355805A US2751041A (en) 1953-05-18 1953-05-18 Filter bag
GB14267/54A GB750750A (en) 1953-05-18 1954-05-14 Improvements relating to suction cleaner filter bags
FR1105257D FR1105257A (fr) 1953-05-18 1954-05-17 Perfectionnements aux sacs filtrants pour aspirateurs de poussière
DEH20299A DE1143308B (de) 1953-05-18 1954-05-17 Papierfilterbeutel fuer Staubsauger
CH324168D CH324168A (fr) 1953-05-18 1954-05-18 Filtre dilatable en papier pour aspirateur de poussière

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US355805A US2751041A (en) 1953-05-18 1953-05-18 Filter bag

Publications (1)

Publication Number Publication Date
US2751041A true US2751041A (en) 1956-06-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
US355805A Expired - Lifetime US2751041A (en) 1953-05-18 1953-05-18 Filter bag

Country Status (7)

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US (1) US2751041A (nl)
BE (1) BE528940A (nl)
CH (1) CH324168A (nl)
DE (1) DE1143308B (nl)
FR (1) FR1105257A (nl)
GB (1) GB750750A (nl)
NL (2) NL187642B (nl)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3107989A (en) * 1961-10-18 1963-10-22 Studley Paper Company Inc Disposable filter bag
US3199275A (en) * 1962-02-27 1965-08-10 Studley Paper Company Inc Conical filter
US3350859A (en) * 1965-10-04 1967-11-07 Studley Paper Company Inc Vacuum cleaner filter bag
US3370406A (en) * 1963-11-29 1968-02-27 Studley Paper Company Inc Vacuum cleaner filter bag
US3491522A (en) * 1967-05-22 1970-01-27 Studley Paper Co Vacuum cleaner filter bag
US3815333A (en) * 1973-06-01 1974-06-11 Royer G Dampening unit for an electric vacuum sweeper bag
US4119414A (en) * 1976-12-15 1978-10-10 National Union Electric Corporation Filter bag construction for a vacuum cleaner and method of operation
EP2465397A1 (de) * 2010-12-17 2012-06-20 Wolf PVG GmbH & Co. KG Staubsaugerbeutel und Verfahren zum Herstellen eines Staubsaugerbeutels

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE626763C (de) * 1931-07-15 1936-03-09 Anton Burkhard Dipl Ing Tuete mit Abfalltasche
US2295981A (en) * 1939-12-23 1942-09-15 Hoover Co Suction cleaner
US2418371A (en) * 1943-04-08 1947-04-01 Hoover Co Suction cleaner
US2444762A (en) * 1940-05-14 1948-07-06 Harry F Waters Bag and process of making the same
US2637409A (en) * 1950-10-26 1953-05-05 Singer Mfg Co Disposable dust bag for vacuum cleaners
US2641333A (en) * 1951-04-18 1953-06-09 Hoover Co Suction cleaner
US2672213A (en) * 1952-06-19 1954-03-16 Hoover Co Filter and method of making the same

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE626763C (de) * 1931-07-15 1936-03-09 Anton Burkhard Dipl Ing Tuete mit Abfalltasche
US2295981A (en) * 1939-12-23 1942-09-15 Hoover Co Suction cleaner
US2444762A (en) * 1940-05-14 1948-07-06 Harry F Waters Bag and process of making the same
US2418371A (en) * 1943-04-08 1947-04-01 Hoover Co Suction cleaner
US2637409A (en) * 1950-10-26 1953-05-05 Singer Mfg Co Disposable dust bag for vacuum cleaners
US2641333A (en) * 1951-04-18 1953-06-09 Hoover Co Suction cleaner
US2672213A (en) * 1952-06-19 1954-03-16 Hoover Co Filter and method of making the same

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3107989A (en) * 1961-10-18 1963-10-22 Studley Paper Company Inc Disposable filter bag
US3199275A (en) * 1962-02-27 1965-08-10 Studley Paper Company Inc Conical filter
US3370406A (en) * 1963-11-29 1968-02-27 Studley Paper Company Inc Vacuum cleaner filter bag
US3350859A (en) * 1965-10-04 1967-11-07 Studley Paper Company Inc Vacuum cleaner filter bag
US3491522A (en) * 1967-05-22 1970-01-27 Studley Paper Co Vacuum cleaner filter bag
US3815333A (en) * 1973-06-01 1974-06-11 Royer G Dampening unit for an electric vacuum sweeper bag
US4119414A (en) * 1976-12-15 1978-10-10 National Union Electric Corporation Filter bag construction for a vacuum cleaner and method of operation
EP2465397A1 (de) * 2010-12-17 2012-06-20 Wolf PVG GmbH & Co. KG Staubsaugerbeutel und Verfahren zum Herstellen eines Staubsaugerbeutels

Also Published As

Publication number Publication date
GB750750A (en) 1956-06-20
BE528940A (nl)
FR1105257A (fr) 1955-11-29
NL91193C (nl)
DE1143308B (de) 1963-02-07
NL187642B (nl)
CH324168A (fr) 1957-09-15

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