Abstract: A mounting collar for a vacuum cleaner bag comprising three or more panels defined from a unitary blank and adhesively bonded in overlying relation to each other. The panels incorporate central aligned openings therethrough which, either in and of themselves or with an adhesively secured elastomeric sheet, provide for a sealing to the exhaust tube of a vacuum cleaner. The blank and the individual panels formed therefrom are from a low caliper stock paperboard material within the range of 15-30 points (0.015 inch to 0.030 inch). The intermediate panel or panels of the overlying panels are peripherally smaller than the outer panels and have the openings therein peripherally larger than the aligned openings in the outer panel.

Abstract: An electric vacuum cleaner having a chamber arranged above the motor housing to receive a filter bag the side of which facing the motor housing is in valve-closed socket-connection communication with the fan-air channel and which can be removed from the chamber after opening and separating the socket connection. The filter bag is in socket-connection communication with a filter-bag intermediate support which is carried along upon the swinging open of the chamber and which has the valve-closure member and from which the filter bag can be separated somewhat on the other side of the vertical position of the cross-sectional plane of the socket connection.

Abstract: A vacuum cleaner uses a special self-cleaning filter arrangement including an initial fabric filter having a relatively large mesh size with a broad open mesh ratio of 5 to 15% and a total opening area of 5 to 45 times the cross section of the inlet, which inlet faces away from the filter. The initial filter is preferably backed up by secondary filters and is arranged so that dirt collected on the filter is periodically sloughed off and dropped into a receptacle after building to a critical level.

Abstract: A filter bag enclosure for containing a laboratory animal and a carrier therefor during transportation is provided with lateral and top seals which prevent gaseous communication with the laboratory animal therewithin except through the filter medium which forms the lateral sides of the filter bag. In accordance with the invention, the lateral edges of the filter bag are sealingly joined to one another by the application of acoustic energy. A length of sealing material, which may be polyethylene, is advantageously interposed between the edges prior to the application of the acoustic energy so as to enhance the reliability of the lateral seals. The top portion of the filter bag is provided with polyethylene strips joined thereto, illustratively by the use of ultrasonic acoustic energy. After the laboratory animal and its carrier is installed inside of the filter bag, the filter bag may be closed by conventional heat sealing of the polyethylene top strips.

Abstract: A disposable bag for removal of dust vacuum cleaners comprised of a nonporous polymer composition sheeting sealed water tight for internally containing a quantity of water that functions as the dust removal media. The bag is configured for mounting internally within the external fabric bag customarily provided by the vacuum cleaner manufacturer. Discharge of dust laden air from the vacuum blower is connected to an air inlet on the bag from which an internal guide directs the air flow to within the body of water. Emerging from the water substantially dust free, the air is directed past baffles to eliminate entrained moisture before being discharged through an outlet opening to the surrounding environment.

Abstract: A filter comprises a pleated fabric filter bag of generally rectangular configuration within which is removably disposed an internal reinforcing cage of wire or rigid plastics material. The pleated fabric filter bag has an open end and a closed end and at its open end there is moulded integrally with the bag an apertured plastics end cap which has an internal configuration corresponding to the pleated fabric bag. The closed end of the bag is sealed either by the bag material or by an integrally moulded imperforate plastics end cap.The filter can be disposed vertically or horizontally within the casing of a filtering apparatus and if disposed horizontally it can be stacked in vertical array.The rectangular pleated fabric filter permits a substantially greater area of filter fabric within a given size of filtering apparatus, casing or housing than has been possible hitherto.

Abstract: A vacuum cleaner housing possesses two guide means on the inner side of the end housing wall with a suction port therein in order to receive the board flange of a dust bag adjacent to the lateral housing wall. The guide means comprise guide rails each with a ramp-like wall, extending towards said housing wall, and guide ribs which are located in the lower part of the housing wall and have a slope opposite to that of the ramp-like walls. They are so shaped as to allow the board flange to be inserted between them and the walls. On introduction of such a board flange of a dust bag its lower end section is bent along a prepared line of bending, which has been formed in the lower part of the board flange parallel to its lower side. Accordingly the board flange is so firmly held in place that it is not bent by the suction force to which it is exposed.

Abstract: A resilient support sustaining the upper terminus of a dirt collecting bag on the handle of an upright vacuum cleaner in which an extensible strap on the bag is fastened within a downwardly open recess on the handle maintaining the upper terminus of the bag completely within the handle recess.

Abstract: An improved filter bag is provided for swimming pool cleaners and the like particularly of the type designed for travel along submerged pool surfaces to dislodge and collect debris. The filter bag is formed from an elongated stretch of porous fabric, such as nylon mesh, folded upon itself to define conforming left and right sidewalls joined by front and rear seams and a seamless upper end. The lower ends of the sidewalls are secured to a mounting collar which cooperates therewith to define an open mouth for entry of debris into the bag and means for attachment about the discharge end of a pool cleaner suction mast. Water and debris are drawn by the cleaner through the mounting collar into a primary flow chamber within a forward region of the filter bag and separated from a rear collection chamber by an upstanding divider seam which terminates below the seamless upper end of the bag.

Abstract: Industrial filter for separating solid particles from a streaming gaseous medium the filter having a filter insert formed from a single band of knitted fabric. The filter insert is provided with a smooth permeable layer of amorphous synthetic polymeric material at least on its inlet inside. Longitudinal and transverse packing sleeves of the filter insert are secured to marginal surfaces of a partition wall by means of a pressure sealing frame. Single filter pockets are inserted in the openings of the partition wall and in place between single filter pockets the filter insert sliding rests upon internal surfaces of the partition wall. During operation a certain amount of separated dust is forced into the gaps between the internal surfaces of partition walls and parts of the filter insert surfaces supported by those internal surfaces. Whereby the accumulated dust layer automatically compensates for the stretching of the needled fabric.

Abstract: A general purpose dust bag for a vacuum cleaner adaptable to various vacuum cleaners. According to the invention, the external surface of the dust bag's end (4) adjacent to its mouth (2) is provided with an attachment device (7), such as a strip of paper 24 glued to the dust bag, the external surface of said strip 24 having thereon a permanent adhesive for securing a desired cassette plate to said bag.

Abstract: A floor care appliance having a filter bag with an inlet chamber accessed by an inlet aperture, and a quiescent storage chamber connected to the inlet chamber by an opening adjacent the top thereof. The filter bag is formed of filter sheet material as an elongate tubular member having the opposite ends folded and sealed to define an air impermeable seal. An inlet aperture extends into the interior of the tubular member adjacent one end thereof and the tubular member is folded upon itself spaced from the other end thereof with confronting portions of the tubular member being sealed together and including an opening adjacent the fold between the confronting portions to maintain an open air path from the inlet aperture to the other end of the filter bag.

Abstract: A vacuum cleaner bag for use with top loading vacuum cleaner has a first collection tube and a second transfer tube, the tubes having communicating apertures near the top thereof, with a thermoplastic coating on the inner walls of the second transfer tube which is fused together to seal the second transfer tube adjacent the lower wall of the aperture thereof, the top and bottom of the first tube and bottom of the second transfer tube adhesively sealed; and a method for automatically forming the bags by superimposing the two tubes, adhesively securing them together, heat sealing the inner walls of the second transfer tube together, below the aperture, and closing the ends of the tubes.

Abstract: A tubular-filter device with compressed-air cleanout has a tube-acceptor plate with insertion openings, each of which having a tubular filter fastened therein with a support basket in each tubular filter. The support basket has a resilient upper edge and the tubular filter is clamped with a band tightly in the soffit area of the insertion opening. A filter-pot cover extends into the top of the tubular filter and is attached to the top of the tube-acceptor plate. The cover has an extension that projects into the support basket and that is secured on all sides by an upper, radially sectional ring of the support basket by a snap attachment positioned along the outside thereof and cooperative with the upper ring of the support basket.

Abstract: A filter module comprises a frame bridged by a plurality of spaced-apart arch members, on which is supported a one-piece filter element comprising a plurality of pockets which each enshroud an arch member, and which connect into a mouth portion circumscribing the frame and held in position by a drawstring. The filter module is easily erected, and a seal between the inlet and outlet sides of filter equipment employing the module is easily provided.

Abstract: Effluent with entrained particles is drawn through a filter module (A) by an exhaust blower (B). The filter module includes an inertial separator (C) for providing an inertial separation of particles from the effluent air and a plurality of filter cartridges (D) which allow air to pass therethrough but not particles. A plenum E interconnects the filter cartridges with the exhaust blower to channel the filtered air from the filter module to the exhaust blower. A flow controller (F) controls the flow rate of air through each of the filter cartridges maintaining it substantially constant. The flow controller includes a flow rate sensor for sensing the flow rate through each filter cartridge and a butterfly damper blade for selectively restricting the plenum to maintain the flow rate substantially constant. A filter cartridge cleaner (G) is selectively actuated when the flow controller is unable to maintain a preselected minimum flow rate.

Abstract: A filter for extracting solids and liquids from gaseous combustion exhausts comprises a textile filter element formed of polyacrylonitrile fibers oxidized by careful heat treatment and comprising approximately 61% carbon after treatment. The filter may be woven, knitted or formed as a batting of randomly-oriented fibers. Abrasion resistant coatings and lubricants for the fibers are disclosed. The filter material is especially useful as a filter bag.

Abstract: A filter assembly for removing particulate matter from high temperature gas streams is disclosed, said filter assembly comprising:a rigid, tubular frame or cage made of high temperature stable material, having a closed lower end, or optionally an open lower end, and adapted to be connected to a gas compartment at its open upper end, the cage having openings to provide at least 40 percent open area on its lateral surface, with each opening having an area of less then 125 square millimeters,a filter element surrounding said cage and comprising a conformable, fabric tape of woven ceramic fibers tightly spiral-wound in an over-lapped wrap about the lateral surface of the cage, said filter element being a gas permeable, rigid, seamless, tubular structure having at least one open end, anda clamping means for securing the filter element to the lower end of the cage, the clamping means optionally forming an end cap for the lower end of the filter.

Abstract: A filter bag having a protective cuff adjacent the closed "free" end of the filter bag for protecting the "free" end from abrasion damage. The protective cuff is preferably formed of a band of material attached circumferentially to the outer wall of the filter bag along a longitudinal edge of the band. The longitudinal edge is attached to the filter bag such that the longitudinal edge is spaced from the "free" end by a distance less than the width of the band.

Abstract: An upright vacuum cleaner having a motor housing, a handle pivotally attached to the housing, and a flexible dirt-receiving bag extending between the housing and the handle is disclosed. A top cover assembly is provided for supporting the top of the bag, and includes a rectangular cup-shaped cover having top, side, and end faces enveloping a portion of the top of the bag. An attaching assembly is provided for attaching the cover to the handle and to the top of the bag within the cover. The attaching assembly includes a wire hanger extending through the top face of the cover and then extending from a location adjacent one end of the cover toward the other end of the cover. The attaching assembly further includes a clamping web fixed to the underside of the top face. Downwardly and inwardly extending ends of the web enter pleats at the sides of the bag to removably hold the bag in place within the cover.

Abstract: A multiple filter bag assembly wherein top access is had for removal and replacement of the filter bags through openings in the cell plate subdividing the filter housing into an upper clean gas plenum chamber and a lower baghouse, wherein use is made of tapered filter bags and a cage for easing the passage of the filter bags through the openings in the cell plate during installation and removal.

Abstract: A felt-like layered composite of the following structure:a. a first layer of a predominantly horizontal coplanar superimposed layers of filamentary polytetrafluoroethylene components interrupted by occasional interlayered orientation;b. a thin high density nonwoven layer of fine glass staple fibers;c. a scrim fabric of polytetrafluoroethylene fibers andd. a second predominantly horizontal coplanar superimposed layers of filamentary polytetrafluoroethylene components interrupted by occasional interlayer orientation;wherein the layers are mechanically bonded together by filamentary polytetrafluoroethylene components extending vertically throughout the composite and a process for making this composite; the composite is useful as a filter fabric and is primarily used for bag filters to remove fly ash from the gaseous combustion products of coal fired furnaces and boilers.

Abstract: A dust collecting apparatus with quick release filter support system comprising an enclosure, a bulkhead structure mounted to the interior walls of said enclosure, and defining upper and lower portions of said enclosure, means for the intake and exhaust of air from the surrounding environment in a single direction, a filter cloth assembly comprising a filter cloth affixed to and supported by a frame assembly inserted into said enclosure, and quick release clamping means used to bring said frame assembly into an air tight sealing arrangement with said bulkhead.

Abstract: A fabric filter bag, a method of making such a bag, and apparatus using such bags, in which the bag is a tube of yarn knit into stitches defining a ground and stitches defining terry loop pile extending from the ground. In accordance with the present invention, such a fabric filter bag, method of making a bag, and apparatus using a bag is improved by the inclusion of a conductive strand for conducting electrostatic charges otherwise accumulating on the fabric filter bag away from the bag so as to suppress accumulation or build-up of such charges.

Abstract: A vacuum cleaner filter bag formed from a blank including a sheet of air permeable filter paper, and which is folded to define a tubular container having closed ends with an access opening formed in the container for permitting the passage of air into the interior of the bag so that the air can be filtered. The bag is formed by folding the blank and applying adhesive material onto specific areas during the folding operation in order to form the bag. On the blank itself there is also pre-applied, by preprinting or extruding, a heat, self-stick or pressure sensitive type of adhesive material on specified areas, these areas being susceptible to tears. After the bag is formed, it is passed through a heat or pressure applying station which activates the preprinted or extruded adhesive material thereby providing reinforcement to the bag at the areas which tend to tear.

Abstract: A vacuum cleaner has an elongated porous outer bag for holding a filter bag over an air outlet. A hanger within the outer bag is positioned to suspend the outer bag from the vacuum cleaner, as well as to hold a pocket within the outer bag, so that spare filter bags may be held within the porous outer bag.

Abstract: A filter house (12) employing a selective catalytic reduction process for removing NO.sub.x emissions from a flue gas stream while simultaneously filtering out and collecting entrained particulate matter from the stream. Accordingly, the filter house (12) includes flue gas inlet and outlet passages (18, 30) and a plurality of porous filter bags. The bags are treated with a suitable catalyst to facilitate the selective catalytic reduction process.

Abstract: A seamless expandable bag filter of nonwoven material using conventional filtering media and having 62% greater extended area than other commercially available extended arm filters and incorporating broad, flat sealing collars or plates on each side of the neck of the bag and sealing them together to insure a no-leak installation.

Abstract: A filter, and apparatus and methods using the filter, in the form of a knitted fabric having particular characteristics and effective for separating materials from flowing fluid streams.

Abstract: The invention relates to a tubular filter element for use in an ultra filtration plant. The element is in the form of a tube of woven fabric which is napped on its internal surface. A cellulose filter aid is deposited, on the nap and the resulting filter element has a high collection efficiency and low filter drag making it particularly suitable for use in an air recirculation plant. The air is drawn from a working area and passed through a conventional primary collection unit and then through an ultra filtration unit containing an array of the filter elements. It is then sufficiently clean to be passed back to the working area, preferably through a HEPA filter, and this results in a substantial saving in heat energy which would otherwise be wasted.

Abstract: A vacuum cleaner dust bag with a relatively rigid collar having an inlet opening for an inlet tube connected to a vacuum cleaner housing. The opening is covered by an apertured elastic diaphragm. The opening of the dust bag is further provided with a large zone and a small zone, which are integral, so that the inlet tube can be inserted through the large zone and the dust bag displaced laterally so that a peripheral flange on the inlet tube will engage with surrounding portions of the diaphragm aperture disposed in the small zone. The dust bag is moved to and retained in this position by the elastic diaphragm whose aperture is disposed centrally relative to said small zone.

Abstract: A filter for use within a storm drain sump which has a fluid outlet through a wall of the sump, the filter includes a bag-like body member having a cylindrical body portion fabricated from resilient mesh-like synthetic material. A base portion of the filter defines a toroid-shaped section. A weighted material is placed within the toroid-shaped section. Wedge-shaped spacers are axially aligned and secured to an outer face of the cylindrical body portion of the filter. A suspension plate is secured to the body member to support the filter in the storm drain sump.

Abstract: Apparatus for the separation and recovery of a solid product transported by a gas, wherein said apparatus comprises at least one filter cartridge made from a rigid porous material mounted in a sealed enclosure and defining in the latter a first filter chamber within the at least one cartridge and which communicates by its lower end with a tube for the collection of the separated solid product and a second chamber for the collection of the filtered gas outside the said at least one cartridge, the latter having two large-surface opposite porous walls maintained with an appropriate spacing by spacers fixed on the said walls and disposed in the filter chamber in such a way as to form deflectors, means for introducing the gas transporting the solid product to be separated into the said filter chamber and means for extracting the filtered gas from the collection chamber.

Abstract: The combination of a vacuum cleaner and a dust filter container. The dust filter container does not have a conventional attachment plate. A support structure is located in the vacuum cleaner housing having a projecting member provided with a hole, the latter is inserted through a slot in the dust container whereby the hole aligns with an opening in the dust container. The hole in the projecting member and the opening form a through passage into the dust container from the inlet suction conduit of the vacuum cleaner. A seal is arranged in the vacuum cleaner housing between a flange on the suction conduit and a portion of the dust filter container surrounding the hole therein.

Abstract: A vacuum cleaner filter bag formed from a blank including a sheet of air permeable filter paper, and which is folded to define a tubular container having closed ends with an access opening formed in the container for permitting the passage of air into the interior of the bag so that the air can be filtered. The bag is formed by folding the blank and applying adhesive material onto specific areas during the folding operation in order to form the bag. On the blank itself there is also pre-applied, by preprinting or extruding, a heat, selfstick or pressure sensitive type of adhesive material on specified areas, these areas being susceptible to tears. After the bag is formed, it is passed through a heat or pressure applying station which activates the preprinted or extruded adhesive material thereby providing reinforcement to the bag at the areas which tend to tear.

Abstract: A vacuum cleaner has an elongated porous outer bag for holding a filter bag over an air outlet. A hanger within the outer bag is positioned to suspend the outer bag from the vacuum cleaner, as well as to hold a pocket within the outer bag, so that spare filter bags may be held within the porous outer bag and an end flap extending into the outer bag.

Abstract: Method and apparatus for maintaining the permeability of porous filtering media used in filtering gaseous suspensions. More particularly the invention defines Inside Bag Dust Collection wherein high energy pressurized gas is introduced for cleaning the filtering media. In the method and apparatus pneumatic impulse forces, derived from a series of charges of pressurized gas are directed downwardly through ever open venturi means and away from the interior of the filter bags; specific jet nozzle elements optimize the efficiency of the pressurized gas application, and an induced air funnel means within the bag causes vertical force resolution for induced air cleaning flow. Spoiler means are provided within jet nozzle means such that particulate matter will neither enter nor accumulate in the jet nozzle opening during normal, onstream gas flow conditions. There is also an accommodation to the conventional dirty gas chamber to efficiently receive high velocity, high volume induced air cleaning flow.

Abstract: A filter structure supporting a series of tubular filter bags for filtering a dust-laden airflow. The filter bags are subjected to a momentary reverse flow for purging collected particles from the bag walls. The filter bags are supported against pressure drops existing across the bag walls by bag shaping members affixed at spaced intervals along each filter bag. Each bag shaping member is retained in an adjustable, annular pocket formed by a cuff secured to the bag wall. This cuff is provided with a sizing means which permits contraction of the pocket to confine the shaping member therein and expansion of the pocket to permit convenient removal of the shaping member therefrom prior to laundering of the filter bag.

Abstract: A plurality of separate V-shaped wire mesh members are arranged and connected in side-by-side relationship to provide a plurality of V-shaped cells across an air stream. A W-shaped retainer or connector formed of perforated sheet metal has outer, downstream facing trackways which receive side edges of the wire mesh members, and a central, upstream facing trackway which receives and retains the free edges of V-shaped filter media bags which are inserted into the V-shaped cells overlying the wire mesh. A stabilizer bar extends across and attaches to the exposed adjoining edges of the V-cells to support the cells in proper relation and retain the filter media in place.

Abstract: A filter including a resilient frame, a hollow body of pleated paper, and end closures, molded together to make a flexible unitary structure which maintains its shape and has the efficiency characteristics of the paper medium.

Abstract: In accordance with the present invention, there is provided a reusable dust bag which may be used in an enclosed-bag type of vacuum cleaner interchangeably with a disposable paper dust bag.

Abstract: A disposable vacuum cleaner bag of paper is insertable into a bag compartment of a cleaner. It has an open dirt intake end and a remote closed end. At the closed end the bag is provided with one or more reinforcing strips having bevelled edges.

Abstract: A gas filter element and method of manufacturing the same, wherein the gas filter element is equipped with a substantially wedge-shaped filter pocket containing side walls composed of filter material and a number of areal spacer holders dispositioned in the pocket and extending transversely to the side walls approximately in the direction of flow of the gas. The spacer holders or spacers are connected along lengthwise edges thereof with the side walls. These spacer holders form oppositely situated sides of a tetrahedrally formed hose section composed of course mesh material.

Abstract: A fiberglass bag filtering unit adapted for use in filtering gaseous streams containing suspended solid particulates wherein a reverse flow of compressed air is utilized during the cleaning cycle, said unit featuring the advantage of being conveniently adjustable to provide a requisite degree of cloth tension without causing excessive stress conditions to occur at any part of the bag where retained by the support elements of the unit.

Abstract: A bag-type filter having a removable filter element, said element being mounted in a cassette frame which may be inserted and removed from the filter housing. The filter element has a plurality of tubular sleeves which are open at the top and closed at the bottom to provide elongated gas passsageways surrounded by filter material. The cassette frame includes stiffening members positioned within said sleeves and a rectangular frame surrounding the top of the filter element. The filter element is suspended from said rectangular frame and is releasably clamped to the frame. The cassette frame has a lower structure which may support the cassette outside the housing and provide reinforcement for the cassette. The filter element is clamped to the frame portion of the cassette by collar means extending from the open top of the filter element over the frame portion, and locking rods operable to interlock the collars with the frame portion of the cassette.

Abstract: A bag-type filter having a removable filter element, said element being mounted in a cassette frame which may be inserted and removed from the filter housing. The filter element has a plurality of tubular sleeves which are open at the top and closed at the bottom to provide elongated gas passageways surrounded by filter material. The cassette frame includes stiffening members positioned within said sleeves and a rectangular frame surrounding the top of the filter element. The filter element is suspended from said rectangular frame and is releasably clamped to the frame. The cassette frame has a lower structure which may support the cassette outside the housing and provide reinforcement for the cassette. The stiffening members include elements engaged in the sleeves to hold them open, the elements comprising a wire lattice having offset guide portions adapted to engage in the closed bottoms of the sleeves.

Abstract: Filtering apparatus having a housing defining an inlet and an outlet. Disposed within the housing is a plurality of filter elements constructed in tubular form and held together as a bundle of such elements. The entire bundle of elements may be removed from or inserted into the housing as a unit. Each of the tubular filter elements has a threaded fitting at each end thereof with the threads on each of the ends being adapted for mating engagement with each other. In this manner a plurality of the filter elements may be assembled in tandem form by threaded engagement of the mating ends thereof to provide the desired filter area and size for any particular application without the necessity of custom designing filter elements for each housing or application. The mating threads are formed on dissimilar non-galling metals.

Abstract: A disposable filter cartridge for suspension from the tube sheet in a baghouse. A wire mesh cylindrical cage is rigidly fitted with a diffuser having plurality of flexible fingers which sealingly encircle the tube sheet collar. A fabric filter sleeve encases the cage and has an upper seal skirt of greater diameter than the outside diameter of the diffuser. The cage may be equipped with a bottom end cap having an annular groove adjacent the cage to facilitate crimping thereon. The bottom of an open filter sleeve may be provided with a cuff having a continuous sealing band disposed therein of slightly larger diameter than the bottom end cap.

Abstract: Across the gas flow path in a duct such as for air conditioning there is placed a composite filter set comprising a plurality of filter elements and means joining said elements, each of said filter elements comprising a plurality of filter pockets and a frame holding said pockets at their open ends, and said joining means connecting the frames of adjacent filter elements in a manner to form a gas-tight seal therebetween so that flowing gas can advance only by passage through one of said filter pockets.

Abstract: A filter bag for a filter system, comprising a number of parallel channels embodied by interconnecting, along parallel assembly lines distributed over pocket length, two opposite side walls of the pockets. The side walls meet at the open end of the pocket; a frame is introduced into each channel, the frame having two substantially parallel members which extend in a plane perpendicular to the main direction of the pocket, such plane being equidistant from the two assembly lines forming the lateral boundaries of the particular channel concerned. At the bottom bag end near the bag end remote from the open end of the bag, the two substantially parallel members meet by way of a bottom member which is substantially perpendicular to the plane of the two substantially parallel members - that is which extends substantially in the main direction of the bag.