Abstract: An air filter of which the dimensions may be easily adapted to the shape and dimensions of air ducts, especially air ducts of air condition equipments, comprises a number of frame shaped modules (1) made of plastics material. To each module a filter bag (2) is welded. The side faces (1a, b, c, d) of each module are provided with a system of ribs (5) or embossments (6). For joining modules substantially airtightly together a system of ribs or embossments on a side face of a module is connected to a complementary shaped system of ribs or embossments on the side face of another module by sliding movement or snap action. Preference is given to an embodiment whereby inclined side boundaries of interengaging complementary systems form a dovetail connection.

Abstract: An exhaust gas purifier of the type wherein a catalytic body is elastically supported within a metal casing. This is achieved by at least partly filling a space between the catalytic body and the metal casing with a dampening member comprising one or more wire blocks. The wire is preformed of a screw shape and that preformed wire is wound into the shape of the block. This block is stretched to elastically fit over the body, and the block is compressed between the body and the casing.

Abstract: A gas filter canister housing assembly (20) capable of receiving gas filter canisters (28 or 40) of differing heights. The housing assembly includes first and second housing portions (54, 56) and holding apparatus (60) capable of holding the housing portion together. The first housing portion has a cylindrical extension (70) in which a filter canister may be disposed, and the second housing portion includes a cup-shape end portion (102) and a depending flexible skirt (100) which may be held against the cylindrical portion (70) in various positions of adjustment.

Abstract: A marine engine exhaust muffler assembly (8) includes inlet and outlet members (10, 11), the axes (13, 14) of which are offset from each other. A muffler housing (12) is disposed between the inlet and outlet members and forms a chamber (15) having disposed therein an annular multi-layered cartridge (23), and with the layers having a multiplicity of perforations (27) therein for passage of exhaust gases and spent engine cooling water therethrough. The water assists in keeping the muffler clean. An imperforate arcuate blocking plate (31) is nested within the lower portion of the cartridge to permit accumulation of the spent engine cooling water within the cartridge to aid in noise reduction at certain engine speeds. The blocking plate is provided with a relief opening means (33) for assisting in water drainage upon engine shutoff.

Abstract: A releasable clamping apparatus for securing cartridge filter elements to a tube sheet of a dust collector apparatus. The clamping apparatus includes a clamping band which surrounds the filter element. The tube sheet includes a plurality of spaced apart J-shaped support clips surrounding each opening in the tube sheet. A plurality of latches are attached to the clamping band and cooperate with the support clips to secure the clamping band and the filter element to the tube sheet.

Abstract: A filtering unit (10) has four filter holders (20) arranged in a rectangle around a blower (36). Each filter holder holds up to two filter elements (11). The blower draws air through the filter elements (11) and outputs filtered air through a vent (40). Refillable filter frames (16) are provided to allow the user to change the filter material (18). In one embodiment, glass chips are used as the filter material (18).

Abstract: A filtering apparatus for separating particulates from a hot gas stream using hollow, tubular filter elements has a housing with a laterally extending support plate for the filter elements separating the housing into upper and lower sections. The tops of the filter elements are biased against the support plate and the bottoms thereof restrained from lateral movement by restraining rings. Blowback and purge gas systems provide for cleaning of the filter elements and maintenance of the blowback system clear of the solids or condensation products that might form during the separation. The apparatus is especially useful in filtering solids from a hot, corrosive gaseous stream, such as a zirconium tetrachloride process gas stream, where the gas stream contains gaseous constituents that are subject to condensation or solids formation during separation of the particulates and prior to discharge from the filtering apparatus.

Abstract: A resilient compressor ball is compressed to urge an axially-movable circular knife-edge onto one end of a cylindrical filter element to form a seal therewith and to urge the filter element onto a fixed circular knife-edge having a fluid outlet opening therewithin to form a seal therewith. The movable knife-edge is concentrically formed on an axially-slidable tubular compressor element which confines the compressor ball within a hollow nut portion of a cap which is screwed onto a cylindrical shell having a base from which the fixed knife-edge extends in axial alignment with the movable knife-edge. When the cap is screwed onto the shell, the compression of the ball urges the movable knife edge against one end of the filter and the other end of the filter against the fixed knife-edge so as to seal the ends of the filter element and thus the seals formed at the knife-edges, while accommodating variances in the overall length of the filter element from its nominal length.

Abstract: An oil-separating air filter assembly having a separator element arranged in a closed filter cartridge, the lower axial end cover of which has a female thread by means of which the filter cartridge can be screwed against the upper end face of a separator head. The latter carries a centrally located threaded sleeve and a standpipe forming part of the air outlet channel, the accumulated oil being drained through an annular gap between the sleeve and the standpipe. The air inlet channel is arranged radially outside the center of the separator head, having an annular channel portion in the separator head facing a plurality of inlet passages in the end cover of the filter cartridge.

Abstract: A carburetor chamber cover device for covering a carburetor chamber of a portable power-driven machine such as a chain saw. The carburetor chamber accommodates an air cleaner and a carburetor for supplying air-fuel mixture to an internal combustion engine. The cover device comprises a cover adapted to close the opening of the carburetor chamber and having an aperture, and a filter plate and a blind plate adapted to be selectively attached to the cover so as to fit the aperture. The filter plate has a screen capable of arresting comparatively large particles of dust. In order to avoid troubles such as blocking of the filter plate by snow or icing of the carburetor, the filter plate is detached and the blind plate is attached instead.

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 dust trap for trapping particles such as dust in a gas pipe between a street tap and a diaphragm type regulator comprises a dust bag for trapping the dust and a retaining member for holding the dust bag in the pipe. The retaining member is of deformable material and has an outer portion of increased diameter for force-fitting the member in the pipe, and a neck portion over which the end of the dust bag is placed and securely held, for example by an outer sleeve fitted over the neck portion.

Abstract: A vacuum regulator for automotive vehicles of the type having an engine exhaust system and a computer-controlled exhaust gas recirculation system, the regulator having a housing provided with a pair of spaced outlets intercommunicating through a flow restrictive orifice and adapted to be connected to the engine exhaust system and to the exhaust gas recirculation system, respectively; an inlet for atmospheric air connected by a passageway to the outlets; and a solenoid-operated spring-biased valve in the housing controlling flow of atmospheric air to the outlets; the housing being fashioned in two parts or sub-assemblies which are interconnected at final assembly by the flux collector which is part of the solenoid, the operating parts of the regulator being uniquely formed and arranged to minimize noise of operation, and the entire assembly being uniquely constructed to minimize cost of manufacture.

Abstract: An in-line vacuum filter normally mounted between a vacuum pump and a vacuum packaging machine to block flow of process debris and sediment that collects at the outer surface of an outer screen of two concentric contiguous cylindrical screen with air flow inward through the two screens. The outer screen surface is viewable from the exterior of the vacuum filter through a transparent outer cylindrical enclosure so that a machine operator can easily see when it is time to disassemble and clean the filter of the sediment and debris buildup thereon. The transparent outer cylindrical enclosure and the two concentric cylindrical screens are held in the assembled vacuum filter between a bottom filter plate and a top filter plate all held together by one rod threaded on both ends with the top threaded into the top filter plate and the bottom extended through the bottom filter plate with a hex nut threaded on the bottom.

Abstract: A sorbent type filter assembly (10) which is made by sequentially placing a first resilient perforated plate (40), a first retention filter (36), a sorbent bed (34), a second retention filter (38), a second resilient perforated plate (42), and a cover (14) within the cylindrical portion (16) of a canister shell (12). The cover (14) is forced downwardly to compress the sorbent bed (34) and to resiliently spring bias or stress the first resilient perforated plate (40). While the parts are held together under compression, an annular edge portion of the cylindrical shell is rolled into a circumferentially extending groove on the canister cover to hermetically and mechanically hold the parts together in their assembled and compressed relationship.

Abstract: An air cleaner for miniature internal combustion engines to be used on model boats, airplanes, and the like, which is comprised of a tubular elastic boot and a removable filter unit. One end of the tubular elastic boot is stretched over and sealingly attached to the air inlet of the engine. Into the other end of the elastic boot member is inserted the filter unit so that all the air entering the engine must pass through the filter. The filter unit is comprised of a porous open cell foam medium which is supported on a peripheral flange to sealingly engage the elastic boot member.

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 filter used in conjunction with a motor driven fan is mounted on the cage which covers the fan blades. The filter has a configuration similar to that of the cage and has a slot extending from its outer periphery to its central area to permit the filter to be slipped over the motor. Drawstrings are sewn into the filter about its outer periphery and are used to secure the filter to the cage. One end of each drawstring is rigidly connected to one of the corners of the slot and the other end of each drawstring has a hook which is hooked onto a bar of the cage to hold the drawstring taut. The cage and filter are disposed on the intake side of the fan so that the air is filtered before it impinges on the fan blades. This prevents the accumulation of dust and dirt on the fan.

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: 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: In a dust filter baghouse which employs a small-diameter filter cartridge, the same attachment structure is adapted for installation of the cartridge from either below or above the baghouse tube sheet. The cartridge has an annular cap having an external bead which is received within an annular recess of a skirt portion of a hollow boot which is clamped to the cap of the cartridge and extends up to the tube sheet. Where the cartridge has to be installed from below the tube sheet, a cylindrical cup is provided having an inward flange at its upper end which is secured to the tube sheet. The cylindrical cup has an annular external recess which receives an annular internal bead on the hollow boot. Where the cartridge is installed from above the tube sheet, an external annular groove in an outwardly extending flange at the upper end of the hollow boot is received within the peripheral edge of the hole in the tube sheet.

Abstract: A filter cartridge is suspended from a baghouse tube sheet by an array of generally vertical spring metal fingers which are welded to the upper edge of the filter cartridge. Each of the fingers has an inward projection, a bag cup having an external annular groove is suspended from the tube sheet. The filter cartridge is installed by pushing it upwardly toward the tube sheet. When the lowermost edge of the bag cup is engaged by the inward projections on the fingers, the fingers are cammed outwardly and the inward projections ride on the wall of the bag cup until they come into registry with the annular groove in the bag cup at which time they snap into the groove, thus latching the filter cartridge. A hosetype clamp secures the filter cartridge after it has snapped into latched position.

Abstract: An evaporative cooler according to the invention comprises a one-piece, three-layer pad wrapped around an open-sided cylindrical barrel-like structure. Water is sprayed uniformly over the interior surface of the pad while a centrifugal blower draws air in through the pad from the outside. A novel base design renders it possible to replace the standard square base coolers with the cooler of the present invention. The cooler can be used either with downward or side delivery systems and can easily be adapted to being mounted in a window. The top, base, and barrel are separately fabricated of a non-heat conducting material and are so shaped that they can be nested or stacked for economy of space in storage or shipping.

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: In a reverse-air dust collector, each of a plurality of small-diameter filter cartridges is suspended from the baghouse tube sheet in registry with one of the tube-sheet openings by a cap adhesively secured to the filter cartridge and a collar having a shoulder adhesively attached to the cap. The collar has an outwardly flared rim and a depending annular portion which is press fitted into a double-beaded outwardly-spring-biased fabric cuff which is positioned between the depending collar portion and the edge of the opening in said tube sheet. The upper bead of the cuff rests on and is supported by the tube sheet. The rim of the collar rests on and is supported by the cuff.

Abstract: This invention relates to the sealing of the aperture rims of cross-sectionally shallowly oval filter bags at the clean gas side of a partition dividing the filter housing into dust gas and clean gas spaces and provided with perforations. Use is made for sealing purposes of a clamping frame placing the aperture rim of each filter bag in contact with the partition at the clean gas side, which is overbridged together with the corresponding partition perforation by a twistable bridging element connected to the clamping frame, at the dust gas side, which bridging element may be placed in resilient contact with the dust gas side of the partition via the bridging element ends and through bulging filter bag portions by means of a spring system bearing on the clamping frame.

Abstract: An elongated tubular natural gas filtering vessel (12) has a plurality of longitudinal tubular filter elements (28) mounted therein by mounting means (44,68,70) which enables lateral displacement of filter elements (28) for longitudinal removal through a forward access port (18) of reduced diameter. A mast structure (44) mounts the filter elements (28) in a matrix array, including perimeteral filter elements (28) not aligned with the access port (18). A central mast (46) is rigidly mounted to the vessel (12) interior, and has a plurality of cross-bars (50) supported thereon. Each cross-bar (50) supports one row in the matrix array. The mast (46) has a plurality of forwardly extending ledges (48) between which are mounted a plurality of latching wrenches (60) with eccentric camming surfaces (64) for releasably locking in place a row of filter elements (28). A superstructure (68,70) is mounted to the mast structure (44) for securing the cross-bars (50) against lateral movement relative to one another.

Abstract: A vacuum cleaner is provided with a dirt cup and a dirt cup holder that telescopically engages with a handle of the cleaner for the guidance of it as the handle of the cleaner pivots relative to the main body of the cleaner.

Abstract: An arrangement for connecting an air filter for automotive vehicles to an associated carburetor. The filter including a cap and a housing having at least one sleeve projecting from the bottom wall thereof. Said sleeve being closed at its free end by a cross wall provided with a slot which is registerable with complimentary slots in the cap. A connecting device comprising a seat for the end of a pin permanently fixed to said carburetor and projecting from it. The seat is in an insert having on its outer surface two diametrically opposite ribs adapted to engage teeth provided on surfaces facing each other of two diametrically opposite legs when the insert, on moving upwardly, penetrates between the legs, thereby catching the end of the pin. At the end of the connecting device opposite the seat is a head adapted to be received through said registerable slots and rotated relative thereto to thereby secure the assembled filter relative to the carburetor.

Abstract: An air filter bag is disclosed for use in vacuum cleaners. The filter bag includes a plastic collar having an annular rim for retaining the collar on a flanged inlet air duct and for establishing an air seal with the duct. The collar also includes an annular sealing lip spaced radially inward of the rim which engages a peripheral surface of the air duct thereby providing a dual sealing arrangement. In order to facilitate removal of the filter bag from the duct, the collar is provided with a tab portion integrally attached to the rim.

Abstract: A combined filter and filter-drier, for the suction side of refrigeration and air conditioning systems, comprises a dual filter system straddling a cylindrical plug of dessicant. Upstream of the dessicant, a rigidly built primary filter assembly comprises an inlet deflector and a stepped filter. Downstream of the dessicant, a secondary filter assembly comprises an outlet filter pad which is compressed by a coaxially disposed spring near the inlet of the filter/filter-drier. The inlet deflector is preferably triangular in shape and is disposed transversely to the inlet.

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: A sweeper hopper with a filter assembly is provided. The filter assembly separates the hopper into a dirt and debris-receiving chamber and an exhaust chamber. Air-borne dirt carried through the dirt and debris chamber is trapped by the filter assembly and the air enters the exhaust chamber from which it is exhausted through a blower. A holding frame holds the filter in place against a supporting frame or flanges. The frame has a shaker motor which is periodically operated to clean the filter by vibration. When the filter is to be replaced, the holding frame is readily separable therefrom for rapid replacement, yet the holding frame securely holds the filter in place when the sweeper is in operation.

Abstract: A pocket filter cartridge having a plurality of side-by-side filter bags secured to a filter header assembly adapted to be secured across a dirty gas stream in a gas duct. The header assembly includes a generally rectangular frame in which the filter bags are secured by collars mounted in the mouths of each of the bags which are held together by clip members to clamp the bags between the collars and the frame to secure the bags to the header assembly.

Abstract: In an air cleaner including a case open at the top and closed at the bottom, a cap covering the open top of the case, the case and/or the cap being formed of synthetic resin, and an annular air filter element fitted in the case, a holding plate is mounted on the bottom of the case for movement axially of the case, and a spring for urging the holding plate toward the cap is mounted between the bottom of the case and the holding plate, so that the filter element can be sealingly held between the holding plate and the cap of the case through gaskets. The holding plate has secured thereto a plate spring resiliently engaging the inner circumferential surface of the filter element for securing the latter in place. A stepped support plate is secured to the bottom of the case for restricting the vertical movement of the holding plate.

Abstract: A split spring steel ring having a channel-shape cross-sectional configuration is sewn into the bottom cuff of a filter bag. The split ring is placed into the opening in the thimble plate of a plenum chamber by lapping the ring at the split and pushing inward until the diameter is reduced for insertion into the opening. The ring is then allowed to expand until the ends abutt at the split. The ring is maintained in its expanded condition in interlocking engagement with the opening by a thimble extension which extends through the ring below the thimble plate of the plenum chamber.

Abstract: A filter anchoring arrangement for securing the dependent ends of a row of filter bags suspended from a common filter supporting plate in a bag house. The anchoring arrangement includes a gathering member and a retaining member cooperating with the gathering member to align and retain a docking pin projecting from the dependent end of each bag upon rotation of the gathering and retaining members into a bag-anchoring position.

Abstract: A canister for a fuel evaporative emission control system of an engine; A mass of adsorbent contained in a canister casing is divided into at least two layers by a pair of spaced filter plates, so that the fuel vapors can be diffused into all parts of the adsorbent layers under the deflecting action of the filter plate and the uniforming action of a hollow space defined between the paired filter plates.

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: A filter bag support member for fastening a filter bag to an apertured bag header plate member disposed between the dirty gas inlet and the clean gas outlet of a filter bag housing comprising a flow-through venturi-like tube having one end releasably fastened to the plate member and a clamp at the other end receiving the filter bag in supporting sealed relation.

Abstract: A gas filter comprising a square frame and an interchangeable filter package containing a filter web of a folded zig-zag configuration forming a plurality of proximate filter pockets received on a support grid mounted on the frame and having a shape complementary to the folds of the filter web.

Abstract: A filter for preventing the infiltration of contaminants into a kinescope envelope, includes a ring having a sloped surface to conform with the conical section of the kinescope neck. The ring also includes a support portion to which is affixed a non-oxidizable fluid permeative member. The ring is configured and dimensioned to rest against the inside surface of the conical neck section through a temperature range of approximately 20.degree. C. to 500.degree. C. so that fluid enters the envelope only through the permeative member. Specially configured clips remain resilient throughout the 20.degree. C. to 500.degree. C. temperature range to hold the filter in the conical section.

Abstract: An attachable and detachable filter for use with an ostomy bag includes a plastics housing member having two sections hinged together by an integral hinge and each section has a peripheral wall. One section has at least one aperture in the wall and the other section carries a sharp-pointed resilient-headed generally cylindrical stud which is a push fit through the aperture in the other to clamp the two sections together. There is a layer of gas filtering material within one or both of the housing sections.

Abstract: A filter housing having one or more flow-through media support members releasably secured in the housing between the dirty gas inlet and the clean gas outlet to divide the housing into a dirty gas chamber and a clean gas chamber.

Abstract: The bottom wall of a filter housing is provided with a flow opening and the top of the housing has an access opening normally closed by a cover. A partition wall in the housing is provided with a passage to permit a filter to be moved into and out of the space below that wall. The side of the housing has a flow opening below the partition wall. A filter in the housing engages the bottom wall around its flow opening, with the top of the filter spaced below the partition wall passage. The partition wall is provided around its passage with threaded holes, into each of which is screwed a threaded portion of a shaft having a head at its upper end for turning it, and a foot at its lower end beside the filter. The outer end of a push bar is rotatably mounted on the lower end portion of the shaft adjacent its foot, and the inner ends of the bars overlap the top of the filter.

Abstract: A core extender and seal are provided which may be used in combination with cartridge filters. The core extender includes a body having first and second ends which are connected by longitudinal communication means through the core extender body. A radially extending shoulder extends from the body and is axially spaced from at least one end of the body, and preferably is a flange having on at least one lateral surface thereof an annular sealing ring. An external surface extends from at least one end to the radially extending shoulder. The portion of the body defined by an external surface may be inserted into the longitudinal bore of the filter cartridge in order to perform a sealing and connecting function between adjacent filters or a cartridge filter and the filter housing.

Abstract: A bag assembly is described for the filter bag collectors used in spray dryers or similar equipment which permits a quick change to fresh filler bags. The bag assembly includes a cage-like support for each of the individual filter bags which is inserted within the bags and which includes a bag attachment and sealing ring at its outer end. A pin-type connecting device employing a simple lifting and turning movement permits the bag assemblies to be quickly removed and remounted.

Abstract: A cylinder primary air filter element is coaxially disposed within a cylindrical shell between an air intake pipe and an outlet provided in the shell. A resilient secondary air filter element is deformably secured in an opening formed in a sidewall of the shell so as to be located outside the outer periphery of the primary air filter. The secondary filter element is secured in place by a filter element retaining plate which is arcuately shaped so as to be concentric with the primary filter element and is readily detachably attached to the shell. A sufficiently enlarged air flow passageway is thus defined between the outer periphery of the primary air filter element and the filter element retaining plate and consequently the resistance encountered by the air flowing through this passageway may be considerably reduced and the excessive bulging of the air cleaner may be avoided. A reed valve assembly is connected to the outlet of a housing which surrounds the secondary filter element.

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: A vacuum cleaner filter bag assembly is provided for protecting against atmospheric contamination upon removal of the filter bag from a vacuum cleaner. The filter bag assembly includes a primary filter bag, an airtight shield, a secondary filter bag and a tertiary filter. The shield and secondary filter bag are connected so as to define a sealed enclosure within which the primary filter bag is disposed. The primary filter bag has an inlet opening but is otherwise sealed closed. An inlet opening formed in the shield is aligned with the inlet opening of the primary filter bag so that the suction hose of the vacuum cleaner directs air with entrained particulates directly into the primary filter bag. The air which passes through the primary filter bag is next passed through the secondary filter bag.