Abstract: The present invention is directed to a device (50) for providing filtration of air. The device includes a body (70) and a cover (72) with each having endless mating structure (76) and (78) which may be welded together thereby mechanically pinching a flat sheet filter media (74) and holding it in place. The cut edge of the filter media (74) is encapsulated. The filter media (74) is held outwardly from bottom (92) of body (70) by gussets (90) to provide sufficient area for air to pass through. Inlet openings (110) are provided between top (94) and endless mating structure (78) in a fashion which allows top (94) to be attached to a flat wall of a sealed housing of a type used for disk drive systems.

Abstract: A filter apparatus includes a filter element. The filter element is formed of a sheet of gas-porous filter material which has been folded into accordian pleats. Alternate pleat-folds are of tight, near knife-edge definition, and arcuate form definition. Hence, all folds on one side of the accordian-folded material are of the knife-edge form, and all folds on the other side are of the arcuate. The pleated material is turned into a cylindrical conformation, with the arcuate folds confronting the central axis of the cylinder, and the tight, knife-edge folds outwardly directed. An adhesive-backed band circumscribes the cylinder to hold the accordian-folded material in such form. Ends caps, one with a central aperture formed therein, are fixed to the ends of the cylinder. The latter is then positioned and secured under a venturi section or pipe. The venturi section or pipe, in any cross-section thereof, is of rectilinear shape.

Abstract: The specification discloses a filter stack in which a plurality of individual tapered frames with openings on their widest sides are alternatively aligned, with filter paper between adjacent frames, such that the openings in one frame face one way and those in the next adjacent frame face the other way. Parallel tongues projecting from one surface of the frames insure that filter paper will be clamped in place. Air leaks are eliminated by shrink-wrapping said stack of frames, except on the ends with openings, to firmly hold them together.

Abstract: A filter assembly includes a casing having a support panel to support the filter element and upstanding walls extending around the periphery of the casing. The corners between the walls are reinforced by a pair of tabs extending, each extending from a respective one of the walls and co-operating with the other wall to provide a double layer of reinforcement. The walls are inclined to the support panel to permit nesting of the casings during transport.

Abstract: A cartridge filter for an enclosed magnetic disk drive is disclosed which includes a dual media drum type filter element in a recirculating filter assembly that surrounds the breather filter and delivers air from the periphery of the disk stack to the axial entry of the ventilated disk spindle assembly. The cartridge provides an extended media surface within a compact space for frequent cycling of the enclosed air volume through the filter.

Abstract: A fragrant scented air filter particularly adapted for use in conjunction with interior building/air conditioning systems which includes a polygonal frame of a U-shaped inwardly opening cross-section defined by a bight portion and a pair of legs, a pad of air permeable, porous, fibrous filtering material having a peripheral edge portion bordered by the frame, and at least two solid rods of fragrant scented material spanning the frame in embedded relationship to the pad and in spaced parallel relationship to each other whereby air can freely pass the same with minimum velocity reduction and maximum fragrance absorption.

Abstract: A filter having a structural framework (45) formed integral with and surrounding an active filtering area, and a process for manufacturing the filter are disclosed. The process includes (a) masking selected areas (40) on a sheet (30) of filter media, which areas will serve as the active filtering areas in the end filter product; (b) applying to the remaining exposed areas of the media a liquid-phase filler material; (c) forcing the material to fully penetrate and completely saturate the exposed media areas; (d) and curing the filler-saturated media areas whereby the filler material solidifies within the fiber structure of the media making that portion of the media sheet impervious to any air flow therethrough. The sealed media area (45) provides a structurally integral framework which is continuous with the active filtering media area (40) of the filter. The filter may then be secured along its integral framework area (45) to a suitable mounting substrate surface.

Abstract: An air filter for a motor vehicle includes a filter body (1) closed by a cover (10). Extending from the bottom of the body are rods (8) for supporting a filtering cartridge (9) made from a flexible material, such as plastics foam. These rods are moulded in one piece with the filter body and they are arranged around the outlet opening (4) of the filter. The filter body is easily stripped from the mould and the supporting rods for the cartridge cannot be lost.

Abstract: A frame is made from a one-piece paperboard blank which is formed in a collapsed shipment and storage blank configuration. The collapsed frame can be manually expanded for use. The corners of the expanded frame are locked by locking tabs and locking slots which hold the frame in its expanded state. The frame can be used to hold air filters which are used to filter the air entering a hot air furnace.

Abstract: A canister filter assembly (10) for use in a vacuum line for trapping particulates and liquids from fluid drawn through the vacuum line including a cupped shaped container portion (12) and a lid portion (14) disposed over the container (12) in sealing engagement therewith. The lid (14) includes a fluid inlet (28) and a fluid outlet (30). A filter assembly (16) including a hydrophobic filter (32) and a prefilter (34) filters the particles and aerosols from the fluids passing through the fluid outlet (30). A filter support (18) supports the filters (32, 34, 36) within the filter assembly (16) and includes a cap member (40) spaced below the prefilter (34). The cap member (40) includes an upwardly extending peripheral rim (42) perfecting a seal with the remainder of the filter support (18).

Abstract: An air cleaner including a casing, a filter element and a holding plate assembly having a grid-like portion, wherein a plurality of engaging portions are formed at the casing and a plurality of other engaging portions are formed at the holding plate assembly for engagement with each other. One of the engaging portions of the casing is located at one side thereof and the other engaging portion thereof is located at a side thereof opposite the one side, and one of the engaging portions of the holding plate assembly is located at one side thereof and the other engaging portion thereof is located at a side thereof opposite the one side thereof. The engaging portions located at one side of the casing and the holding plate assembly are displaced vertically from the engaging portions located at the other side.

Abstract: A filter assembly having clamping means for resiliently engaging marginal areas of the filter media and wherein the clamping means comprises elongate members engaging material facial portions of the filter media and clips supportingly carrying the elongate members with each of the clips having an arm connected to the elongate members and being pivotally movable to first and second positions and wherein in the first position the elongate members carried by respective arms are in biased clamping engagement with the filter media and wherein in the second position the elongate members are away from and out of clamping engagement with the filter media to facilitate replacement thereof.

Abstract: A reusable air filter system for providing permanent, self-charging, electrostatic filter stages that are easily cleanable for re-use. The filter system may be used on air conditioners, furnaces, and grease hoods. A frame is circumscribed about the edges of a plurality of polypropylene filter elements. At least one stage of the filter is three dimensional in shape and folded over on itself to retain its filtering characteristics and to provide a dual biasing device for use with the filter stages upstream of the three dimensional filter. The folded three dimensional filter is not creased, thus providing an additional biasing element in the filter system.

Abstract: The present invention is directed to a filter element (10) retained between a retention cover (12) and a support (18). Filter element (10) is provided with an inner liner (24) longer than an outer liner (26). Inner liner (24) extends between retention cover (12) and support (18) to absorb substantially all the axial load created by the retention mechanism.

Abstract: An air filter is described which is made of a non-woven fabric and an overlapped synthetic net which are intermittently point bonded together. The net has raised bumps which form the bonding points for the fabric. A filter of this design is structurally strong but does not generate a large air pressure loss.

Abstract: An air filter for use with wood or coal stoves of the type having a plenum surrounding the firebox. The air filter includes a porous framework in the shape of a C-shaped channel which houses a filter pad. The outer and inner surfaces of the framework are porous and substantially open. The framework is preferably of a relatively stiff, but deformable, open weave material bounded along its edges by a circumferential frame. The inner surface defines an access opening through which the filter pad can be inserted. The air filter is sized to cover a recirculating air inlet of the stove. Magnetic strips allow the air filter to be easily and quickly mounted to the stove without modification.

Abstract: This invention provides an improved construction for air filters wherein the filter frame is provided with indentations or recesses adjacent to its opposite corners which allow a plurality of filters to nest together in a laterally offset relationship to conserve space. The invention can be employed with an air filter including a filter element of fibrous material and a frame for supporting the filter element at its marginal edges. A set of recesses is formed in the same face of the filter frame and located along adjacent sides of the frame at positions adjacent to its opposite corners. The recesses are spaced from diagonally opposite corners of the filter frame by substantially the same distance to permit a pair of filters to nest together in a laterally offset relationship for shipment or storage.

Abstract: A desiccant cartridge for insertion into a laboratory desiccator having a bowl with a side wall, a concave bottom wall, a plurality of spaced projections within the side wall located proximate the concave bottom wall, a shelf supported on the projections, and a space between the shelf and the concave bottom wall, the desiccant cartridge having a convex bottom wall and a planar perforated top wall joined by a seam, a plurality of circumferentially spaced indentations in the cartridge for placement in mating relationship with the projections, and desiccant confined between the bottom and top walls, the desiccant cartridge being located in the space below the shelf with its convex bottom wall in contiguous relationship to the concave bottom wall of the bowl and with its top wall being spaced from the shelf.

Abstract: A filter assembly comprising a filter retainer apparatus, an air filter frame and having a removable pleated filter media. The pleated filter element is secured within the frame by the retainer apparatus which comprises an expandible retainer having elongated flanges disposed on opposite ends. One flange is secured to a rod which slidably fits within a sleeve to which the other flange is attached. Resilient apparatus, preferably an elongated helical spring positioned between the sleeve and the rod, keeps the flanges in spaced relationship. One of the flanges engages one end fold in the filter element and forces it into contact with the frame. The rod is then forced into the sleeve compressing the spring and the other flange engages the other end fold of the filter element, forcing the other end fold into contact with the frame. The spring forces the rod and the sleeve apart so that the flanges securely hold the filter element in the frame.

Abstract: This invention provides an improved construction for air filters wherein the filter frame is provided with indentations or recesses adjacent to its opposite corners which allow a plurality of filters to nest together in a laterally offset relationship to conserve space. The invention can be employed with an air filter including a filter element of fibrous material and a frame for supporting the filter element at its marginal edges. Preferably, a set of recesses is formed in the filter frame at positions adjacent to its diagonally opposite corners. Each recess is adapted to receive the frame of another air filter to permit the filters to nest together in a laterally offset relationship for shipment or storage. The air filters are arranged in a stack with alternate filters in the stack diagonally displaced relative to the remaining air filters. The recesses permit each air filter to be nested with one or both of its neighbors.

Abstract: Filter for treating a gas such as the exhaust gas stream from a diesel engine, which exhaust gas often conveys carbon particles into the atmosphere. The treating filter comprises a casing holding a plurality of serially arranged filter beds. The latter are comprised of monolith ceramic discs, and are maintained in spaced apart relationship by spacer rings to define a turbulation chamber between adjacent beds. Said beds are provided with an oxidation catalyst to promote incineration of the retained particles. The beds further serve to reinforce and support a non-rigid filtering media contained within the respective chambers.

Abstract: An air filter is described which is used in conjunction with an overflow receptacle or container of an engine cooling system. The container is in fluid communication with the engine cooling system so that coolant may flow from the cooling system to the container when the coolant expands within the cooling system and to permit the coolant to be drawn back inwardly into the cooling system as the coolant cools. The upper end of the container is provided with a fill opening having a threadadly mounted closure element thereon. The closure element is provided with a plurality of openings formed therein to permit air to be drawn into the container as the coolant therein is drawn into the cooling system and to permit air to escape outwardly therethrough when coolant is passing from the cooling system into the container.

Abstract: A filter device used to filter medical anesthesia gases and other inhalable respiratory gases. The filter device has a ported housing, and a filter member within the housing. The filter member is a porous sheet that is transversely pleated and draped to define a peripheral foot of such porous sheet. The peripheral foot is sealed along its entire periphery to the housing. Two sets of intermeshing hangers are provided with both sets of the hangers being anchored to the housing and distortingly maintaining the porous sheet in such a pleated condition.

Abstract: An improved assembly for holding a filter element so as to define a filter assembly for removing particulate matter from a sample gas stream. First and second housing sections mount and enclose a replaceable filter element. An annular wall extending between the housing sections divides the interior of the housing into a first region open to an inlet, and a second region open to an outlet, the filter element being mounted in the second region, downstream of the wall. A plurality of openings through the wall assure that particulate matter collects evenly over the surface of the filter element. In this manner, the useful life of the filter element is greatly extended.

Abstract: A dust control system for a mining machine, particularly for controlling respirable dust in coal mining operations, comprising a ductwork system having intakes adjacent the cutter head of the mining machine, a fan for drawing air through the ductwork system, a flooded bed scrubber in the ductwork system upstream from the fan for entraining dust, including respirable dust, in the air in droplets of water, air flowing through the scrubber carrying the dust-laden droplets of water downstream from the scrubber, a sump below the ductwork system between the flooded bed scrubber and the fan, a demister in the ductwork system above the sump for separating the dust-laden droplets of water and directing them into the sump, and a pump for pumping the dust-laden water from the sump to a point adjacent the cutting head. A method of controlling dust is also disclosed.

Abstract: An air filter assembly is provided which comprises a compressible air pervious multi-sided filter panel and a frame therefor, the latter being adjustable from a collapsed first mode to an operative second mode. The frame of foldable sheet material includes a foraminous center section in supporting engagement with the filter panel; a marginal section delimiting the center section; and a plurality of elongated peripheral sections arranged in alternate pairs and foldably connected to an coacting with the marginal section and with each other to form a hollow verge encompassing the filter panel periphery when the frame is in the second mode. The peripheral sections form a substantially flat multiply flange overlapping and compressing the filter panel periphery when the frame is in the first mode. A first pair of alternate peripheral sections have the opposite end portions thereof overlying corresponding end portions of a second pair of alternate peripheral sections when the frame is in the first mode.

Abstract: A filter assembly in an air cleaner includes a lower wire-form adapted to receive two opposite ends of a pliable filter material. Spaced wires on the lower wire-form enable manual forming of pleats in the filter material and define the tops of such pleats. A complementary upper wire-form is engageable with the lower wire-form and attached filter to define the bottoms of such pleats.

Abstract: A gas dust-removing or dedusting filter of the kind incorporating a filter casing, filter tubes or bags having a flattened oval cross-section, and internal spacing elements. The casing includes a vertical partition having perforations and dividing the casing into a pure or clean gas chamber and a gas dust-removing chamber. The tubes or bags are horizontally insertable into the dust-removing chamber through the perforations of the partition and are sealed at their open ends to the clean gas side of the partition while their closed ends are supported on the rear wall of the casing.In accordance with the invention, parallel vertical guide members, each having a surface which slopes with respect to a rear wall of the casing, are secured to the inner side of the rear wall of the casing. One guide member is disposed between two adjacent filter tubes or bags. The filter tubes or bags rest on support bars adjacent the rear wall of the casing, which engage said guide members.

Abstract: A dual filter system for heaters and airconditioners comprising releaseably securable throwaway secondary filter secured to a disposeable or permanent primary filter.

Abstract: A filter assembly for use especially with air conditioning and heating ducts, comprising first and second rectangular frames, the latter frame being detachably positioned in the first one, and a filter element sandwiched between the rear end of the second frame and a flange seat on the first frame. Interiorly separable snap lock elements on the first and second frames serve to retain the latter frame and filter element in position in the first frame. The second frame is formed into a louver or grill and includes a plurality of horizontally-spaced and inclined slats, the spacing being so as to permit ample flow of air through the assembly, the slats serving as a handle for the insertion and withdrawal of the second frame relative to the first one.

Abstract: In a mist collector for separating drops of liquid from a gas or vapor stream and including a cylindrical housing and metal fiber webs mounted in an annular configuration in the housing and arranged to be penetrated by the stream in the radial direction of the housing, the metal fiber webs are composed of a plurality of cylindrical layers spaced apart from one another in the radial direction and the collector is provided with stream conducting elements positioned and arranged with respect to the housing for causing the stream to flow through the layers in a radial inward direction.

Abstract: A filter for removing airborne grease has spaced front and rear walls each with a series of transverse louvers extending into the interior of the filter and opening downwardly. A filter media of expanded metal sheets is sandwiched between the front and rear walls.

Abstract: An air-filter assembly having a filter cap and a filter case, both being made of elastic material such as synthetic rubber and which are formed integrally with each other. The air filter assembly is provided at an air inlet pipe portion of a valve for use in an exhaust gas emission cleaning system.

Abstract: An air filter assembly for a fuel-injected engine of the rectangular air inlet type typical of some imported automobiles is secured directly to the filter seat flange of the air intake opening of the engine, without a separate housing or canister. The filtering element is of a soft, porous foam material backed by a wire mesh of relatively large mesh size, and a collar at the base of the filter assembly is secured to both the filtering element and the backing mesh to hold the assembly together and in the proper configuration. Backing may be included on both the inner and the outer sides of the filtering element, sandwiched between inner and outer bands or flanges of the collar, with fasteners extending between the bands to pull them together and hold the filtering element and backing in the collar. The filtering element and backing are formed into an outwardly bulging, generally arcuate configuration for optimizing filtering area.

Abstract: Air cleaning means suitable for use with an internal combustion engine including a fuel vapor adsorbing filter element and a sucked air cleaning filter element arranged independently of and separately from each other. The fuel vapor adsorbing filter element includes a filter material layer containing fibers of active carbon for adsorbing fuel vapors thereon, and a metallic reinforcing member, while a sucked air cleaning filter element includes a filter material layer of the usual type for cleaning the air drawn by suction into a combustion chamber of the internal combustion engine. The fuel vapor adsorbing filter element may further include a plurality of reinforcing layers of nonwoven fabric each located on one of opposite sides of the filter material layer.

Abstract: A gas filter device, adapted to be installed between an exhaust emission control device and an intake manifold of an internal combustion engine for filtration of the intake manifold gases which pass to the control device upon variations in vacuum, is comprised of a filtering chamber having an inlet port for connection to the intake manifold and an outlet port for connection to the control device, a first filter element positioned in the chamber and including glass fiber, metallic wire, and sintered bronze, a second filter element positioned in the chamber between the outlet port and the first filter element and made of non-woven cloth having a fine texture, a retaining late located between the inlet port and the first filter element and having multiple passageways, and a hat-shaped separating disc having multiple passageways and a head portion installed between the first filter element and the second filter element for keeping the second filter element away from the first filter element.

Abstract: An automobile type exhaust gas lead filter is particularly applicable to diesel engine smoke reduction. It has a tubular housing with alumina coated metal wire fibers as the filter bed, which is centrally located. There are open spaces forming plenums at the ends of the housing. And, the inlet and outlet pipes have baffles in alignment therewith to prevent direct impingement of exhaust gases on the coated wire. Also, the baffles are spaced from the inside ends of the pipes to minimize pressure drops.

Abstract: The engine of a self-propelled combine is mounted in an enclosure having an inlet through which cooling air is drawn by an engine-driven fan. The air is filtered by a rotating disk-like screen mounted over the air inlet before passing through a radiator adjacent the inlet. A duct extends across the face of the disk from its center to periphery, changes direction and terminates with an open end adjacent the inlet side of the fan by-passing the radiator. The duct is also open adjacent the face of the screen so that the fan draws air through the duct, (some of the air being necessarily drawn from inside the screen as it passes the duct opening) so that foreign material filtered from the mass of cooling air being drawn through the unobstructed portion of the screen and held on the screen exterior surface is removed and carried through the duct. A trash knife rigidly attached to the periphery of the screen extends outwards parallel to the screen's axis of rotation.

Abstract: Filtration apparatus in which the filter medium is mounted at a slope with respect to the horizontal and in which there are means to vibrate the medium in a horizontal direction to assist the cleaning of the medium. A single chamber may contain many sheets of media, one version of the apparatus comprises a plurality of separate modular structures each containing at least one filter medium and in another version modular structures are so designed that they assemble into a stack and when so assembled form the necessary conduits by which each filter medium communicates with the necessary inlets and outlets for the relevant materials.

Abstract: A filter module has a housing providing a receptacle for a standard filter element, and also has a lateral extension for accommodating securing means to hold the filter element in place. The lateral extension defines a grille opening for removeably receiving an outlet grille in flush relationship, the grille opening extending laterally beyond the receptacle. A seal gasket closes the space between the grille and the filter element, embracing the securing means.

Abstract: An improved filter element assembly for use in an air cleaner on an internal combustion engine comprises a perforated liner. A replaceable filter element comprising a pleated filter medium is releasably coupled to the liner. A safety sleeve assembly is interposed between the filter medium and the liner. An outer liner surrounds the filter medium and exerts a radially inward force thereon to bias the pleats into engagement with the liner. The filter element assembly can be reconditioned when the filter medium becomes used with a replacement kit which includes a new filter element, safety sleeve assembly, and outer liner. The used filter element assembly is disassembled and the worn components thereof replaced with the new components of the kit. The filter medium is expandable from a collapsed cylindrical form in which the filter element is shipped to an expanded conical form for use during filtering operations.

Abstract: An improvement in a traveling pneumatic cleaner for vacuum collection of fiber waste from a textile mill room in the form of a filter disposed in a receptacle for separating fiber waste from an air current passing through the receptacle. The filter defines a surface of revolution, preferably taking the form of a substantially conical foraminous surface about a central axis of the receptacle, and so arranged relative to the receptacle that the air current will be directed around the filter and then through the same with the velocity of the air current being diminished and lowered as it passes through the filter. Optionally, the filtering may be augmented by a foam filter medium cooperating with the foraminous surface.

Abstract: A filter assembly to remove impurities from a pressurized fluid stream comprises:(a) a longitudinally elongated barrel, first and second end structures at opposite ends of the barrel, said structures including end caps, and elongated tie members spaced about the barrel and removably interconnecting said end caps,(b) the barrel adapted to receive flexible container means containing fluid stream filtering material, and a spring located within the barrel between one of said end structures and said flexible container means to pressurize the latter for expanding same sidewardly against the barrel, and(c) the first end structure containing a fluid inlet and an annular plenum communicating with said inlet, said first end structure having an annular wall extending about a cavity in endwise longitudinal alignment with the barrel interior, said plenum extending about said wall which contains multiple through openings angled to pass pressurized fluid from the plenum to the cavity in sub-flow streams which are caused to

Abstract: An improved apparatus for filtering an air flow which is warmed or cooled and used for heating or cooling purposes, comprises a filter frame defining a filter area and a filter medium supply source located in proximity to the frame, wherein the frame and supply source co-operate so that the filter medium which is removed from the filter area is replaced by filter medium from the supply source.

Abstract: Holder for an annular filter includes a support frame or basket with a flared portion at its upper end which cooperates with the inner leg of an inverted U-shaped sealing ring to clamp the upper end of the filter. The sealing ring has its outer leg seated on a sealing gasket positioned on top of a support plate surrounding an aperture through which the filter is lowered during operation of a particle collection apparatus. The holder is replaceably sealed in position by screwing a pair of threaded rings together to force the flared portion downwardly. The diameters of the various parts are larger than the aperture to prevent them from being dropped through the aperture and the overall design is such that the filters can be replaced from the upper clean side of the collection apparatus rather than the lower dirty side.

Abstract: The drawings illustrate an air filter assembly which is assembled from a pair of identical box-like housing halves. Equally spaced rib elements are formed in each half such that, upon assembly, the rib elements are interdigitated to provide a space for confining therebetween a pleated filtering sheet having a large filtering area.

Abstract: A filter assembly which includes spaced first stage resin bound fibrous filter members with a second stage fine filter member spaced between the first stage members to form plenum chambers on opposite sides of the second stage member with the first stage members being dimensionally stable and supporting and protecting the second stage filter member.

Abstract: An air cleaner assembly of the flow through type has a central element of open cell foam rubber, such as foam polyurethane, two series of rigid thermoplastic rods sandwiching the central element, the rods being capable of developing and holding a positive electrostatic charge, and first and second air permeable outer sheet elements of synthetic fibers, such as polypropylers, overlying each of the series of rods. The assembly has enhanced air cleaning abilities, is readily washable, and produces an atmosphere containing increased concentration of negative ions.

Abstract: A compact nestable air filter of generally rectangular form comprising a frame formed of an integral suitable cut and scored blank of paperboard, which, when assembled, comprises planar frame members engaging a substantially sheet-form filter element therebetween, and having flared frame members disposed at an angle of less than 180.degree. permitting a plurality of completed filters to nest within each other, thereby reducing the bulk of the plurality of filters. The end portions of the flared frame members may be connected together by several means, including glue flaps hingedly connected to one frame member and adhesively affixed to an adjacent member. In an improved embodiment the planar frame members on the bottom or downstream side of the filter are provided with an integral perforated cover sheet for retaining the filter element in place when subjected to an air current. The flared frame members are provided with edge panels interconnecting the upper and lower panels forming the frame members.

Abstract: A filter suitable for filtering gases comprising a resilient foamed synthetic plastics filter element having a perforate support extending thereacross, and a peripheral resilient foamed synthetic plastics sealing frame, the edges of the element being located in a channel of the frame and secured therein by marginal portions of the perforate support extending into the frame.