Abstract: The disclosure describes a filtering apparatus and a method for manufacturing a filtering apparatus comprising a housing and a filter arrangement disposed within the housing. The housing may have first and second identical body portions. The filter arrangement, which may include an end cap and a filter element, may be secured within the housing solely by mechanical compression between the first and second body portions.

Abstract: An external spark arrestor assembly attached directly to the outer shell of a muffler of an internal combustion engine. The assembly includes a spark arresting screen disposed over the exhaust port of the muffler and forming a first exhaust-receiving conduit between the screen and the muffler; an outer perforated cover disposed over the screen and forming a second exhaust-receiving conduit between the screen and the outer cover; and a single centrally located fastener for removably fastening the screen and outer cover to the muffler shell.

Abstract: A filter assembly for filtering the cooling air entering the starter housing of a small air-cooled internal combustion engine. The assembly includes a plurality of upstanding brackets attached to the perforated face of the starter housing. The brackets include hook-shaped upstanding ends. A foam filter medium includes a plurality of slits formed therein, which correspond to the brackets. The filter is placed over the brackets and against the face of the housing such that the brackets receive the respective slits. A retaining ring is snapped into the hook-shaped ends for retaining the filter and for biasing the filter against the face of the starter housing to form a tight seal therebetween.

Abstract: A filter assembly includes a filter media unit and a frame unit. The frame unit is expandable and contractible whereby various filter media unit sizes can be accommodated. The frame unit includes a plurality of crossed legs that are pivotally connected together, and snap fastener assemblies are used to releasably attach the frame unit to the filter media unit body. Locking pivot pins can be used to attach adjacent legs together.

Abstract: A high reliability, non-blocking air filter for filtering large volumes of low pressure air from equipment to be maintained free of dust and impurities while being ventilated during operation is disclosed. The filter media is mounted in a frame having a U-shaped cross section construction, which is attached over an air intake opening of the piece of equipment. The filter media includes a planar base surface and a plurality of projections. The tops of the projections define a surface above said planar base surface for supporting free-flowing articles so as such that these articles do not obstruct the air flow through the air intake filter.

Abstract: A two step process for ultrasonically welding together first and second thermoplastic pieces and welding a membrane between these two pieces. The first piece comprises an annular bead, the second piece comprises an annular energy director. The method comprises first ultrasonically cutting and sealing the membrane to the first piece using an anvil comprising an annular projection and at the same time creating a groove in the first piece. The annular bead is ultrasonically melted and thus welds the membrane to the first piece. The first and second pieces are then brought together so that the groove and energy director are aligned. Under ultrasonic action, the energy director melts within the groove creating a strong weldment without any voids or material flashing.

Abstract: The present invention relates to a filter unit having a sheet of filtering material mounted on a first frame and a second frame received within and below the first frame. The second frame is configured such that the filtering material is tightly held between the first and second frames and the filtering material is stretched by the second frame. In accordance with one of the aspects of the present invention, the second frame is provided with ear members. The ear members are sized such that the ears penetrate the filtering material and hold the first frame tightly between the ear members. The ear members reinforce the first frame by the second frame, through a mechanical interconnection of the frames and also, prevent slippage of the filtering material.

Abstract: A cylindrical screen construction for a filter and a method of producing the screen. A sheet of metal screen containing a multiplicity of holes is rolled into cylindrical form and the longitudinal edges of the sheet are joined by a thermoplastic connecting strip. The strip is generally H-shaped in cross section having a pair of opposed longitudinal grooves that receive the respective edges of the sheet. Heat and pressure are applied to the strip causing the thermoplastic material to fuse and penetrate the holes along the side edges of the screen to provide a smooth surfaced mechanically interlocked joint between the edges.

Abstract: A device for filtering air in a room equipped with a ceiling fan having rotating blades includes at least one element made of a filtering material which is interconnected between two adjacent blades of the fan by a fastening means.

Abstract: An automatic transmission fluid filter is disclosed, comprised of a metal base member, a plastic cover member attached to the base member, enclosing a volume. Filtration material inside the volume is interposed between an inlet and outlet to the filter. A plastic overmold around the periphery of the union of the metal and plastic members hermetically seals the filter except at the inlet and outlet. In a preferred embodiment, the metal base member includes a flanged edge which is secured to a flanged edge of the cover member by the overmold. Slots through the flange of the base member allow plastic of the overmold to flow through, connecting together plastic on both sides of the flange. Also, the base member flange ends curled lip embedded in the plastic of the overmold. Edge sections of the filtration material extend to and between the union of the base and cover members over some sections of the edge of the filter.

Abstract: A monolithic catalytic converter has a two-piece slip pin that extends through a monolithic substrate and is connected at its opposite ends to the housing so as to retain the substrate therein while freely allowing differential thermal expansion between the slip pin and the housing to accommodate thermal mismatch between these components.

Abstract: A multiple stage filter assembly which combines a permanently framed particulate filter media layer with an odor and particulate removal filter media layer which is removably mounted to the particulate permanent filter frame in overlying relationship to the outer surface of the particulate layer. The odor removal filter media layer is held in position by a plurality of filter retaining members which cooperate with the main frame structure to provide support for the gaseous filter layer. The retaining members function in a manner which permits simple removal and replacement of the gaseous filter layer without disturbing the permanently framed particulate filter layer.

Abstract: In accordance with the various aspects of the invention, a spray booth media support module (1) includes a rectangular frame (5) which is of generally channel section. The frame forms opposing spaced end members (7) and connecting side members (8). One frame end has an inwardly bent lip (11) having spaced notches (13) therein. The opposed frame side members have slots (14). A generally rectangular grid (6) is adapted to be removably mounted to the frame. The grid includes spaced elements (15, 16) arrayed generally parallel to the frame end and side members. A plurality of wide prongs (17) extend outwardly from the grid for impaling an overspray-catching pad (4) thereon. At least several prongs are aligned in a vertical tier arrangement.

Abstract: A high efficiency particulate air filter, and a method of fabricating the same, are disclosed, with the filter being characterized by being lightweight and readily disposable after use. Further, the filter may be fabricated in a basic or universal form, which permits it to be utilized to form any one of a number of possible specific mounting configurations by the placement of one or more specifically designed headers about the outer periphery. The filter comprises a sheet of HEPA filtering media folded upon itself in accordion fashion to form a filter pack, and a relatively thin and lightweight peripheral frame surrounding and supporting the pack. The frame is composed of a relatively hard, crust-like, air impermeable molded material which is self-bonded and sealed to the filter pack to effectively preclude the leakage of air therebetween.

Abstract: Filtering material and filtration apparatus employing the filtering material. The filtering material includes a perforated laminate of a plastic sheeting and a metalized coating adhesively attached to a fabric backing. A filter bag formed from this filtering material is mounted within a support structure so that the metalized coating is electrically connected to the support structure.

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 paint spray filter for use in a paint spray booth. The filter comprises a grid having a plurality of vertical and horizontal members, attachment means secured to the grid extending upwardly and outwardly therefrom, and a sheet of fiberglass filter material. The fiberglass filter material has a first face substantially covering the grid and being secured thereto by the attachment means, and a fully exposed second face. Support means extending from the edges of the grid are adapted to cooperate with the frame members of the paint spray booth for maintaining the paint spray filter in the booth.

Abstract: A flame arresting ventilated wall or panel for an explosion-proof enclosure comprises a stack of aluminum sheets apertured to provide a plurality of discrete, generally parallel gas flow channels disposed in crisscross patterns across the heights and widths of the sheets. Fasteners tie the sheets together into a rigid structure and are disposed in patterns surrounding and individually uniformly supporting the gas flow channels from the center of the sheets to their outer edge. Combinations of three different punched sheets are used, namely, first and second apertured sheets spaced apart by relatively thin separator sheets. Along each of the plurality of gas flow channels, each separtor sheet has a large window and the first and second apertured sheets have separate arrays of nine and sixteen flow holes, respectively, registered with the windows, each array having a total cross-sectional area about one-fourth of each corresponding window.

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 evaporative cooler pad assembly comprising a pad of absorbent material, e.g. woodwool is retained between a pair of side grids each of which has projections which interengage the other, and at least some of the projections extend through the pad and support it.

Abstract: A catalytic booster-converter for insertion into the exhaust pipe of a vehicular exhaust system comprising an elongated conduit device adapted to be rigidly connected in series with an exhaust pipe intermediate the ends thereof. The elongated conduit device is in separate length portions which are spaced apart a predetermined distance. A catalytic converter element is interposed between and removably secured to the facing ends of said length portions. A converter element is secured between such length portions in such a manner that it can be removed and replaced by movement transversely of the conduit device.

Abstract: A railway car for transporting pulverulent lading includes a fluid-tight container, slope sheets mounted within the container defining two troughs leading to a sump in the lower portion of the container, two aligned permeable conveyors in the bottom of each trough, an apparatus for alternately aerating each permeable conveyor in each trough for fluidizing the lading to facilitate movement thereof into the sump. Discharge valve structure is provided below the sump for pneumatically unloading the container pipe for pressurizing the space between the slope sheets and the container, and a pipe interconnecting the top of the container and the discharge valve structure for conveying air from within the container to the discharge valve structure during unloading of the container, are also provided.

Abstract: An internally supported composite filter having a wire-like frame, two confronting sheets of filter media secured to the frame, a ring of adhesive at the center of the sheets secures their confronting faces together in a relatively uncompacted fashion, and a handle secured to the sheets proximate one of the corners of the frame which can be grasped by a workman to remove the filter from the mounting structure in a peel-away fashion.

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 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: A cartridge for a catalytic ozone converter comprising an aluminum honeycomb core, a tubular metal shell surrounding the core and affixed thereto, metal rib support members fastened to the shell and to the honeycomb core, and a catalytic coating deposited upon the cell walls of the honeycomb core.

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: 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: In a mist filter for use in eliminating moisture from the humidity laden air traversing through the evaporator of an automobile or other air conditioner, the filter comprises a pair of corrugated screens, with the corrugation of each screen being arranged perpendicularly with the corrugations of the other adjacent screen, a pair of said screens being fastened together, and arranged contiguously with the evaporator of the air conditioner.

Abstract: A gas separation device has peripheral flow-through frame with a sheet of gas separation filter media disposed across the frame and attached to the frame for filtering a gas stream passing through the filter media. As an aid in installing and removing the gas separation device from an installation, one advantageous embodiment has a handle centrally disposed of and attached to the filter media and projecting from one face of the filter media while another advantageous embodiment has two handles centrally disposed of and attached to the filter media and projecting from opposite faces of the filter media.

Abstract: A pocket filter in the form of a filtering block is provided with an assembly of channels open at one end to receive gas from which dust is to be removed, and is interleaved with the channels of another assembly open towards the other end and delivering the gas from which the dust has been removed. These channels have a generally square-shaped cross-section, and are connected to each other, for example by stitching lines, along their edges. During operation, the initial shape provided for the cross-section of the channels of the two above mentioned assemblies is maintained by tensioning these two assemblies with tensioners or the like, on which are fixed the edges of the outer channels of the filtering block.

Abstract: A filter assembly for the filtration of a liquid or gaseous substance comprising a frame and a plurality of filter members fitted in the frame in parallel relation to one another. Each filter member consists of two elements connected together to form a hollow interior, the substance to be filtered being introduced at one side of the filter and passing through the hollow interior and then through the filter elements for discharge between adjacent filter elements of adjoining filter memers. Each filter element comprises a layer of fiber glass and at least one fleece layer, the two layers being connected by needle felting together at locations between the connections of the filter elements constituting the filter member.

Abstract: A filter cartridge for filtering fluids comprising: a cylindrical porous support tube which is permeable to the fluid to be filtered; at least one layer of boro-silicate glass filter paper being wrapped around the cylindrical support; a porous sleeve including a wall having a longitudinal slit therein to allow wrapping of the sleeve around the filter paper; and a zipper affixed to the wall which closes the slit and maintains the position of the glass filter paper without damage to the paper. Also disclosed is a method for manufacturing a filter cartridge having as a principle filtering element a boro-silicate glass paper which is very fragile and can be seriously degraded by crushing. The method comprises wrapping at least one layer of boro-silicate glass paper around a cylindrical porous support; wrapping a cylindrical porous sleeve including a wall having a longitudinal slit therein around the filter paper to secure and protect the filter paper; and closing the slit by closing a zipper attached to the wall.

Abstract: Open cell, air permeable filtering material is attached adjacent the air inlet passage of an electronic circuit chassis by means of a fastener including a plurality of extending barbed members which are semiresilient, the barbs of said fasteners attaching directly to the cells of said filter in response to the application of pressure therebetween, said barbs resiliently yielding to permit removal of said filter from said chassis.

Abstract: A ram air filter for light aircraft comprising a parallelepiped housing and a replaceable filter element is disclosed. The housing comprises a base element and a cover element, which are injection molded of high impact plastic and are connected together in a snap-lock manner. The parallel faces of the base and cover elements include a plurality of ribs that define aligned apertures through which incoming air enters and leaves the housing. The ribs are formed such that they present a minimal amount of surface area to the incoming air stream during flight. A plurality of 90.degree. locking studs attach the housing to the air intake channel of the aircraft's carburetor. The replaceable filter element is also parallelepiped in form and lies in the space defined by the housing so as to filter the air flowing through the aligned apertures. The replaceable filter element is formed of a compressible foam, preferably having a porosity grade lying in the range of 20-50 pores per linear inch.