Abstract: A fluid filter for a solenoid which includes a flexible filter element and two plastic tips for installation in an annular groove. The plastic tips are arcuate shaped to fit tightly against the outside diameter of the annular groove when the flexible filter element is wrapped around the annular groove during installation and the tips are bonded together to secure the filter to the groove.

Abstract: A filter assembly includes a disposable filter element and a reusable perforated supporting core, the filter element being removably mounted around the perforated core. The filter assembly may include first and second end caps and each end cap may include a first segment or adapter attached to one end of the filter element and a second segment or adapter attached to a corresponding end of the core. The first and second segments or adapters of each end may be detachably sealed to each other. The filter assembly may include a wrap having one or more strips wrapped at least once around the filter element.

Abstract: A porous filter medium is formed by a pleated cylinder of a depth filter medium. An absolute rated inner filtration layer is arranged between upstream and downstream drainage layers. The depth filter medium is formed from a continuous sleeve. Additionally or alternatively at least the downstream drainage layer may be formed integrally with at least a part of an inner filtration layer. The material of the medium may be a fibrous mass of non-woven synthetic polymeric micro-fibres which are free of fibre-to-fibre bonding and are secured to each other by mechanical entanglement or intertwining, with the diameter of the fibrous structure varying across the medium.

Abstract: A noise attenuating air cleaner assembly for an internal combustion engines or the like operating in a dusty environment. The air cleaner assembly having a silencer assembly arranged concentric inside an air filter cartridge assembly and a noise attenuating end wall assembly closing an end of the air filter cartridge assembly attenuating air cleaner assembly to provide a source of clean air to the engine and to reduce transmitted induction noise.

Abstract: A filter cartridge for a liquid is designed to be removably received in a housing and comprises a tubular filter element of zig-zag folded paper having two ends that are secured to two respective flexible washers. The cartridge does not have any central reinforcement of its own and its washers co-operate directly for sealing purposes with appropriate annular bearing surfaces of a perforated rigid tube that is included in the housing: the cartridge is therefore easily discarded or degraded after use.

Abstract: A vehicle ventilation system has a combined air inlet and filter assembly that combines the functions of selectively inletting fresh or recirculated air to the system, while filtering both, and also providing for easy filter change. An arch shaped inlet housing located upstream of the blower has two inlets lying on a cylindrical surface, one opening to the outside and one to the inside. A swingable cover moves over the outside of the inlet housing, blocking or opening one inlet at a time, but leaving the interior of the inlet housing unobstructed. A filter is fed through one of the inlet openings to take on the arch shape of the interior of the housing, covering both inlet openings so as to filter both inlet air selections. The filter may be easily removed and replaced.

Abstract: The invention comprises a filter cartridge including a cylindrical filter medium potted into a top cap, and having an internally potted bottom closure molded in place inside the filter medium.

Abstract: A ceiling mounted air purifier that provides a high velocity, multi-directional air exhaust pattern that distributes filtered air to all areas of a room which includes a plurality of filters and centrifugal fans. The centrifugal fans are substantially surrounded by baffles which form generally equally spaced exhaust outlets.

Abstract: Filter media used for removing foreign matter from an air stream flowing therethrough, which includes a pair of first and second generally flat sheets of filtering material extending in generally parallel relation to one another with a spacing therebetween. The first and second sheets are each formed with a plurality of dimples extending, respectively, inwardly toward the other of the sheets for abutment therewith to maintain the spacing between the sheets, and the dimples in one of the sheets are spaced from one another along the extending length thereof and are also spaced from the corresponding dimples in the other sheet, with such spacing preferably being equal. Also, adjacent pairs of such filter media sheets are arranged so that the dimples in the facing surfaces of adjacent pairs are offset from one another whereby clumps of foreign matter do not tend to collect and become anchored in opposed crevices formed by the dimples.

Abstract: A filter cartridge is provided with an end cap and a lock ring which capture a filter element therebetween on assembly and which include projections extending beyond the outer surfaces of the end cap and the lock ring. The application of heat to the projections causes the material of the projections to fuse together and provide a leak-proof seal between the end cap, the lock ring and the filter material.

Abstract: A fail-safe air handling and safety system is described. The system is for use by workers during removal of hazardous substances, such as asbestos, lead, and toxic chemicals, from within a structure. The structure has a containment area with air exhaust openings for maintaining the containment area at negative pressure with respect to ambient. A decontamination unit sealingly connects to a doorway in the containment area and provides for an air locked entryway for the workers. For convenience of on-site erection, the decontamination unit is modular with the modules sealingly connected in a series with each module connected the one to the other. Unique air inlet diffusers provide inflowing makeup air, and the devices are interlocked so that, upon loss of negative pressure in the containment area, a standby air filter becomes operational.

Abstract: A filter cartridge for use in a fluid filtering system, constructed to induce rotational flow in the unfiltered fluid, includes a pleated filter sleeve in which the individual sleeves are slanted relative to the sleeve circumference in a direction opposite to the direction of the rotational flow fluid. The slanted pleats can be constructed by creasing a sheet of filter media at alternatingly shorter and longer widths to form pleats having relatively shorter front legs and relatively longer back legs. The shorter front legs bias the pleats in the counter-rotational direction.

Abstract: A cylindrical filter bag including a wire mesh cage is provided with an access opening in the cage proximate to the open end of the filter bag. A resilient snap band is provided around the outer circumference of the cylindrical filter bag. The snap band includes a pair of felt rings formed around the band and an annular groove between the rings. The snap band thus provided can be depressed into the access opening in the wire mesh cage to allow the filter bag to be readily positioned in an airtight manner within a circular hole provided in the tube sheet of a dust collector. The hole in the tube sheet is provided with a collar having a radially extended flange portion that is attached to the top surface of the tube sheet to center the collar above the hole. The wire mesh cage of the filter bag is further provided with a reinforcing sleeve that mates with the tube sheet collar, and a venturi that is positioned concentrically within the sleeve.

Abstract: A filter insert having a block-shaped configuration comprises a planar material that is permeable to a medium and is arranged as a plurality of pleats having pleat walls. Each pleat wall has opposing first and second edges. The pleat walls are arranged in a zigzag pattern presenting first and second edge sections wherein a medium to be filtered passes through the filter insert in a direction from the first edge section toward the second edge section. The pleat walls have embossed projections which are parallel to one another and project with a height in a direction toward an adjacent pleat wall. The projections have length in a direction from one edge to an opposite edge of a respective pleat wall and a width perpendicular to the length. The width is essentially constant over the length and the length exceeds the width. Adjacent projections of adjacent pleat walls contact one another for securing, spacing and stiffening the pleats and the filter insert.

Abstract: A porous filter medium is formed by a pleated cylinder of a depth filter medium. An absolute rated inner filtration layer is arranged between upstream and downstream drainage layers. The depth filter medium is formed from a continuous sleeve. Additionally or alternatively at least the downstream drainage layer may be formed integrally with at least a part of an inner filtration layer. The material of the medium may be a fibrous mass of non-woven synthetic polymeric micro-fibers which are free of fiber-to-fiber bonding and are secured to each other by mechanical entanglement or intertwining, with the diameter of the fibrous structure varying across the medium.

Abstract: A filter element incorporates a filter medium formed in one example by two strips of paper which are rolled about a center tube so that the medium in section, has a zig-zag configuration. Apertures are provided to allow the passage of air from the pockets defined by the paper.

Abstract: A disposable canister containing a HEPA filtration mechanism is used in conjunction with a removably mounted vacuum motor assembly. The vacuum motor assembly draws particulate-laden air, including harmful airborne contaminants, into an inlet opening of the canister by a disposable vacuum hose. The inlet opening is made of a magnetically attracting material. The particulate-laden air is then filtered through the HEPA filtration mechanism prior to exiting from the canister as non-contaminated air. Upon termination of the vacuum force on the inlet, a hinged magnetic flap seals the inlet to the canister. The immediate and complete sealing of the inlet by the magnetically biased flap assures against escape of harmful contaminants from the canister.

Abstract: In a vacuum cleaner comprising a reduced velocity chamber with a high velocity air inlet, an electric motor, a rotary means driven by the motor for creating a vacuum in the chamber, an outlet for exhausting air from the chamber, which air flows in a selected path from the air inlet, through the chamber and out the air exhaust outlet and a disposable porous sheet filter layer in the chamber for removing solids particles from the air there is provided an improvement comprising a gas removing filter between the filter layer and the motor where the gas removing filter comprises an activated charcoal filter layer in the chamber, intersecting the air path and generally coterminous with the disposable filter layer.

Abstract: A high efficiency ventilation system for removing contaminants from an area used in combination with an air conditioner or an environmental monitoring system. The system includes a fan unit and filter unit. The filter unit has two filters, a prefilter and a HEPA filter, each of which has its static pressure monitored by a separate gauge. The static pressure of the fan used in the fan unit is monitored by a third gauge. Thus, it is possible to determine which of two filters needs replacement and troubleshooting can be performed much faster and more efficiently. The air conditioner is coupled to the output of the fan so as to condition the air discharged from the ventilation system and pass the air back into the work area. The environmental monitoring unit may instead be coupled to the output of the fan so as to monitor contaminants that remain in the ventilated air.

Abstract: A frame carries a variable flow scent dispenser and supports an air filter. The frame, dispenser and filter are to be inserted as a unit into a forced air heating and/or cooling system duct adjacent to the duct outlet through a floor or wall register. The filter is in the form of a two-ply fibrous sheet with an opening between the plies to receive the frame and dispenser. The filter collects dirt particles borne by the warm air as it leaves the duct and is quickly and easily replaceable. The scent dispenser is a container for scented air freshening material and has apertures through opposite walls, which walls are disposed transversely to the direction of airflow, permitting warm airflow through the container. The warm air will cause evaporation from the scented material and will entrain the vaporous scent and disperse the scent throughout the room.

Abstract: A submicron particle filter unit of the Hepa type adapted to be interposed between a source of pressurized gas and a work-processing region to provide an environment therefor free of particles and other contaminants. The membrane of the unit is fabricated from a continuous, elongated, porous metal sheet accordion-folded to define a uniform series of pleats forming a media pack having an entry and an exit face, the pack being clamped with gaskets between the side plates of a frame or welded or otherwise joined thereto. Pressurized gas from the source applied to the entry face of the pack is filtered therethrough to yield at its exit face a laminar flow of gas which creates a clean environment for the work-producing region.

Abstract: The object of the present invention is to offer a general-purpose size filter cartridge for liquid filtration, which can extensively increase the service life for filtration. A depth type filter cartridge comprises a cylindrical hard porous core with threads wound thereupon, and it is characterized in that a sheet-like filter element is wound on said porous core directly or through a thread-winding layer, and a sheet-like filter element with a large number of pores is wound on said sheet-like filter element through a spacer.

Abstract: An air flow system for removing airborne particulate material includes a bank of filters through which air is moved in one direction, thus depositing particulate material on an air input side of the filters. A vacuum head associated with a secondary vacuum system is intermittently applied in a reciprocating movement to selected portions of the air input side of the filters for cleaning them, while the remaining portions of the filters continue to operate in the normal manner without interruption. Both the filters and the vacuum head are provided with integrally formed interengaging guide means which facilitate this operation.

Abstract: A replacement filter cartridge assembly includes a filter cartridge element and a reusable supporting core assembly. The filter cartridge element is cylindrical in shape and has top and bottom end caps. Either the top end cap or the bottom end cap has an opening formed through its thickness which communicates with a central bore extending longitudinally through the filter cartridge element. The supporting core assembly includes a perforated tubular core and a sealing end cap mounted on one end of the core. The core is inserted through the top or bottom end cap opening and into the central bore of the filter cartridge element. The sealing end cap rests against either the top or bottom end cap of the filter cartridge element, while the other end of the tubular core contacts the inner side of the opposite end cap of the cartridge element.

Abstract: A high efficiency ventilation system for removing contaminants from an area. The system includes a fan unit and filter unit. The filter unit has two filters, a prefilter and a HEPA filter, each of which has its static pressure monitored by a separate gauge. The static pressure of the fan used in the fan unit is monitored by a third gauge. Thus, it is possible to determine which of two filters needs replacement and troubleshooting can be performed much faster and more efficiently.

Abstract: A filter cartridge for use in a fluid filtering system, constructed to induce rotational flow in the unfiltered fluid, includes a pleated filter sleeve in which the individual sleeves are slanted relative to the sleeve circumference in a direction opposite to the direction of the rotational flow fluid. The slanted pleats can be constructed by creasing a sheet of filter media at alternatingly shorter and longer widths to form pleats having relatively shorter front legs and relatively longer back legs. The shorter front legs bias the pleats in the counter-rotational direction. Apparatus for manufacturing the pleated sleeve includes a pleater roll having pleater wires spaced to form the alternatingly shorter and longer pleat widths.

Abstract: A filter insert of nonwoven material in the form of a pleated pack is self-supporting and consists of thermally weldable nonwoven (1). Each of the two outside ends (3) of the pleated pack (2) is hemmed by the nonwoven material (1) forming the pleats, which is folded over in the same direction and at the same time is fixed in tight contact to the corresponding folded of the adjacent pleat end. At the same time the nonwoven material projects beyond the near crease of the adjacent pleat end by 0.5 to 1.5 times the pleat spacing. For manufacture, the flat filter material (1) is first pleated and then a defined pleat spacing (7) is produced by drawing it apart to a limited extent. Then the two outside edges (8) of the pleated pack are gripped between comb-like tools (9) entering pincer-wise into the pleating at top and bottom, leaving the filter material projecting beyond the tools on each side by 1.5 to 2.5 times the pleat spacing (7).

Abstract: A submicron particle filter unit of the Hepa type adapted to be interposed between a source of pressurized gas and a work-processing region to provide an environment therefor free of particles and other contaminants. The membrane of the unit is fabricated from a continuous, elongated, porous metal sheet accordion-folded to define a uniform series of pleats forming a media pack having an entry and an exit face, the pack being clamped with gaskets between the side plates of a frame or welded or otherwise joined thereto. Pressurized gas from the source applied to the entry face of the pack is filtered therethrough to yield at its exit face a laminar flow of gas which creates a clean environment for the work-producing region.

Abstract: A glove bag assembly comprising a glove bag adapted to be optionally sealed horizontally to create an upper and a lower portion; a valve assembly connected at its inlet to said lower portion via a conduit and at its outlet to a waste container; and vacuum-generating means communicating with splitter valve means, whereby the amount of vacuum applied to the entire assembly can be controlled.

Abstract: A filter cartridge comprising a pleated, cylindrical filter element is provided with an end densification ring to cause the ends of the pleats to pack together more tightly. In this configuration they can be more easily and securely sealed in an end cap closing off an end of the filter cartridge.

Abstract: A filter cartridge comprising an elongated sheet of porous filter material folded into an array of primary pleats is further folded to define secondary pleats which are tucked between the primary pleats. The secondary pleats define tapered portions at the top and bottom of the filter media, thereby reducing the width of the pleats at the top and bottom thereof to a width less than the primary width of the pleats, to thereby minimize the amount of sealant required to seal the ends of the pleats. The secondary pleats also resist radial and circumferential collapse of the pleats during filtering.

Abstract: An air flow filter device includes a housing having at least two openings therein, a stationary air filter, such as an HEPA filter, disposed within the housing, and a one-way air flow valve disposed within the housing in parallel with the filter. The valve is positioned such that sufficient air flowing into the housing from the one opening closes the valve so that such air flows through the filter in order to exit through the other opening, and such that sufficient air entering the housing from the other opening opens the valve so that the air flows through the valve in order to exit through the one opening. In this manner, air may be circulated in both directions without escape of contaminants, such as asbestos fibers, into the environment.

Abstract: An assembly is provided of a filter bowl (10), a cartridge (12) and a head (11) in which the filter bowl (10) can be removed after it has descended from the filter head (11) through a distance corresponding to only a minor part of the length of the filter cartridge (12). The cartridge (12) is a push fit into a vertical port (52) in the filter head (11). Flange (18) of the cartridge (12) and a slotted buttress (44) of the bowl (12) establish a mechanical connection between the filter bowl (10) and the cartridge (12) so that the filter bowl (10) and the filter cartridge (12) are together mounted to and demountable from the filter head (11). The filter cartridge (12) having the support flange (18) that coacts with the buttress (44).

Abstract: A tubular filter element consisting of a filter leaf which is pleated and connected at both its fold ends to a hollow cylindrical filter body (F) both of whose front surfaces are sealed by end caps (11, 13), one end cap (13) of which opens, as a connection cap, the hollow core (10') for communication with a housing space (3) of a surrounding housing, the force flow guidance of the fluid to be treated takes place along the folds (10) through a tube (6', 5) which extends through the hollow core (10') of the filter body (F), rests on the fold edges of the filter body (F), is open at one end in the area of the fold range functioning as outlet or inlet (20), is tapered in the area of the fold range functioning as inlet or outlet (21) and forms a connection (5) for the recirculating flow of fluid coaxially to the connection cap (3) for the flow of fluid to be treated which cap establishes the housing communication.

Abstract: A high efficiency air filter is described which comprises a depth filter sheet that has been formed with micropleats stabilized by application of a strip of a thermoplastic adhesive across the peaks of the micropleats and then formed into a macropleated structure with the axes of the micropleats and the macropleats being essentially parallel. The micropleats preferably have a bending radius of less than about 0.01 inch.

Abstract: A negative pressure filtration device is used in conjunction with a containment enclosure for the removal of hazardous material such as asbestos insulation surrounding pipes in habitable buildings. The inventive negative pressure filtration device generates a negative pressure within the containment enclosure, which negative pressure is quantitatively adjustable and capable of being continuously monitored by the user. Advantageously, the negative pressure filtration device is small, lightweight, portable, battery-operated and reliable, for use in a wide variety of hazardous material removal scenarios. The portability and versatility of the negative pressure filtration device is achieved through the use of operational vacuum pressures and air flow volumes much smaller than those of known systems.

Abstract: The instant invention provides a strip shaped filter material having a longitudinal plane with crimps molded therein for filtering a liquid or a gas comprising filter material being folded in a zigzag shape and having individual fold segments; said individual fold segments being held at a distance from one another via the crimps; said filter material having nondeformed filter strip segments adjacent to each crimp; said crimp having a zenith height; and the filter material having a thickness, in a cross section placed perpendicular to the longitudinal plane of the strip, which constantly decreases within the area of the crimps, starting from the nondeformed filter strip segments, up to the zenith height of the crimp, and that at the same time, the filter material is increasingly compressed in the direction of decreasing thickness.

Abstract: A self contained portable negative pressure control system enclosure for protection from airborne asbestos particles and the like from a work space includes an enclosure formed of portable rigid door frames having spring doors and a weighted transom closure within that communicate with the work space to define multiple non-sealed decontamination chambers. The enclosure is used with a room divider or in an access doorway to the work space which is maintained in a negative air pressure by exhaust blowers equipped with HEPA filters.

Abstract: An air filter comprising a sheet of filter material folded in a zig-zag configuration. A hardenable material is dispensed in a flowable state onto the sheet. The hardenable material has a varying thickness such that upon hardening, it holds the folds of the sheet apart in a selected orientation. The hardenable material may comprise glue to also secure the folds together. An air penetrable sheet can be secured to the fold edges at one or both sides of the filter.

Abstract: A self-spaced pleated filter element is provided having panel elements including repeating cycles of corrugations separated by spans of uncorrugated filter material.

Abstract: A rechargeable filter assembly for removal of contaminants from liquids of all types, particularly dry cleaning solvents comprising three nested and spaced apart concentric perforated metal cylinders defining an inner cavity and an outer cavity held in spatial relationship by a base plate and removable lid. With the lid and outer perforated cylinder (exterior shell) removed, a removable and disposable filter unit may be placed within the outer cavity and similar, or different, filter medium may be placed within the inner cavity. The gaskets of the filter unit in conjunction with the lid, the base, the conduit, exterior shell and the inner perforated cylinder provide seals which prevent liquids from bypassing the filter unit.

Abstract: A high efficiency filter and method for its production. An array of tube-type sleeves, each sleeve composed of a filtering medium and joined longitudinally along its exterior surface to the adjacent sleeve, is expandably fixed into a framework and all margins of the array are sealed to the framework in order that a fluid passing orthogonally through the plane of the array and its frame must pass through at least two filtering surfaces. The process and machine used to make the aforementioned product start with a relatively narrow roll of filtration media and, through a series of steps, form, cut and glue the media so as to form the requisite sleeve structure and then by means of controlled curing, affix a predetermined number of the sleeves in to the desired array.

Abstract: An apparatus and method for transporting hazardous, toxic or nuisance materials from the controlled chambers of removal sites to disposal sites and containing these materials by controlling the environment within the cargo area of a transport vehicle and for some distance outside it. The apparatus comprises a cargo chamber to control leakage and air flow, a regulated air handler to maintain a predetermined vacuum pressure within the cargo area relative to outside ambient pressure, a filtering system to trap air borne particles before exhausting into the outside environment and a wetting means, filter means and containment process for larger contaminates. The unit is self sufficient to provide its own generated electricity, liquid flow supply and automated control process enabling the containment system to function under stationary or mobile conditions for extended periods.

Abstract: Process for the production of filters whose active filtering part is made up of a folded filter material web, preferably made from paper, which folded web is delimited in the process by side edges at which the folds terminate, and end edges at which a first or last fold is located, so that in this way filter units (49) are formed. The filter units (49) are produced in an automatized process in which the filter material web is creased and pushed together to form the folds. The spacings between the folds are maintained constant by means of a screw element with threads pushing down between the folds and forming spacing elements between these. The screw element is rotataed during forward movement of the folded web. Glue-coated strips are pressed onto the said side edges of the web, so that the ends of the folds are covered over by the strips.

Abstract: A high efficiency filter assembly having a generally rectangular pleated filter element with ends defined by the pleated edges of the element and sides defined by generally planar side edges of the element. The filter element is mounted in a generally rectangular housing formed by two pairs of oppositely disposed frame members that are joined together. Each frame member has a planar base member and a pair of upright side member defining an open ended channel to receive the ends and sides of the filter element. At least one spacing member extends along the base portion to space the ends and sides of the filter element from the surface of the planar member. A dam member is provided at each end of one of the pairs of planar members to enclose the channel, and a sealant is disposed in the channel and the ends of the filter element are embedded in the sealant.

Abstract: A HEPA-type filter including a cannister body with an inlet and outlet coupled through a filter unit having at least one prefilter and a HEPA-type filter therein. The prefilter protects the HEPA-type filter from moisture and clogging. The module can include a fume hood to prevent hazardous material from escaping when a cannister liner or bag is replaced. The module can form part of the vacuum system for a hazardous waste removal system and is coupled to a conventional separate vacuum source for operation thereof.

Abstract: A filter element comprises at least two pleated filtering mediums and at least one roughly flat filtering medium interposed between the pleated filtering mediums. Each pleated filtering medium has an end constituted by edges of triangular bottom sections and the other end constituted by edges of triangular top sections. The triangular bottom sections of one pleated filtering medium is bonded to the flat filtering medium only at and near the edges of the bottom sections. The triangular top sections of the other pleated filtering medium is bonded to the roughly flat filtering medium only at and near the edges of the top sections. Spacers are provided between the top sections and the flat filtering medium and between the bottom sections and the roughly flat filtering medium. Such spacers may be constituted by alternate small ridges and grooves formed in the roughly flat filtering medium.

Abstract: An air filtration system for removing smoke and grease from cooking exhaust of ducted range hoods is disclosed. In particular, the system includes a coarse filter device fine filter device which substantially remove all of the cooking effluents from the cooking exhaust drawn into the system by a fan powered by a variable speed motor. A sail switch device is connected to the motor and is positioned in the system to determine the flow quantity of the air drawn into the system and to maintain this flow quantity at a substantially constant volume by controlling the speed of the motor device. A maximum speed of the motor is determined by an indicator device signaling an operator to change filters clogged with cooking particles.

Abstract: Mobile air cleaning apparatus comprising a base, a cabinet which is mounted on and extends upwardly from one end of the base, and a hood which is supported by the upper end of the cabinet and extends over the base. A circular air flow path is formed which includes the open space between the hood and the base, and ducts in the base, the cabinet and the hood. In the air flow path are particle filters, an activated carbon filter, and a blower. The base is mounted on wheels so that the entire apparatus is readily movable.

Abstract: Filter cartridge for filtering apparatuses for removing impurities from hot and/or highly pressurized flowing gases, with zig-zag formed, folded, gas-penetrated filter material whose part surfaces caused by the folding, between the fold lines, are arranged in relatively close juxtaposition to each other, wherein a preferably thin-walled plate 15 is arranged in the space between two respectively adjacent part surface 12, 13 of the filter material 11, with said plate having one straight-formed edge 16 lying in the inside of the fold 14 and one opposite lying zig-zag formed edge 17, and the bend or crest lines 18 between the two edges 16, 17 rise steadily towards the medial plane 19 of the plate 15.