Abstract: A powder spray booth wherein the workpieces are moved through a coating se and coated by powder coming from an electrostatic spray gun at a spray opening. An aspiration blower is used for forcing the air coming in through the spray opening through a cyclone unit with a battery of cyclone separators and through a filter unit with a filter bag. The air is moved upwards along upwards sloping lines of flow to the aspiration duct, and the powder is moved downwardly under the effect of gravity. Only a part of the powder reaches the cyclone separators and is removed from them through airlocks. The part of the powder not separated in this way deposits in the filter space, a part of it only after cleaning the filter. This part of the powder is removed on opening an outlet door and is taken up on the screen of the powder car and then mixed with the powder from the cyclone separators or, by opening the outlet door, run into a space, where a second powder car may be placed.

Abstract: A rubber or elastomer gravity dump valve for an air cleaner is provided with an internal bracing strut to control the compliance of the valve discharge lips. The strut extends across the valve at or adjacent to the point of lip initiation.

Abstract: An air cleaner assembly is provided for supercharged engines including a supercharger compressor, comprising a vortex air cleaner upstream of the supercharger compressor, and a rotatable barrier filter cartridge that is self-cleaning downstream of the supercharger compressor.

Abstract: This invention provides a heat exchanger, particularly useful for systems requiring cooling of hot particulate solids, such as the separated fines from the product gas of a carbonaceous material gasification system. The invention allows effective cooling of a hot particulate in a particle stream (made up of hot particulate and a gas), using gravity as the motive source of the hot particulate.In a preferred form, the invention substitutes a tube structure for the single wall tube of a heat exchanger. The tube structure comprises a tube with a core disposed within, forming a cavity between the tube and the core, and vanes in the cavity which form a flow path through which the hot particulate falls. The outside of the tube is in contact with the cooling fluid of the heat exchanger.

Abstract: A vertical media bed dust collector in which the media bed of a filter panel is rejuvenated when necessary by interrupting the gas flow through the panel, withdrawing the filter media from the panel, separating the agglomerated dust from the filter media, returning the filter media to the filter panel, and reestablishing the gas flow through the panel. The system further includes apparatus for removing collected dust from the separating and recirculating surfaces of the media handling apparatus and also from the remote face of the filter panels before the cleaned gas is allowed to pass out of the collector so that the cleaned gas is not recontaminated by small amounts of dust adhering to those surfaces.

Abstract: A self cleaning industrial dust filter includes a housing divided by a tube sheet into an upper clean air chamber and a lower dirty air chamber. Pleated fiber cartridge type filters are supported in the lower chamber from the tube sheet and the interior of the filters communicate with the clean air chamber through openings in the tube sheet, one for each filter. The lower chamber is formed as a plurality of panel venturis which converge downwardly from the lower end of the filters to a narrow throat. A clean air outlet connects with the upper chamber and a dirty air inlet with the lower. Downwardly directed jet nozzles are positioned in each venturi to induce reverse flow through the associated filters, remove accumulated particulates and conduct them to a take out at the base of the lower chamber.

Abstract: A fluid catalytic cracking vessel having cyclone separators which have cyclone diplegs. The diplegs have valve plates which are inclined, in the closed position, at an angle of about 30.degree. to about 60.degree. with respect to the vertical axis of the respective diplegs.

Abstract: This invention relates to an apparatus and method for rapidly separating particulate solids from a mixed phase solids-gas stream which may be at velocities up to 150 ft./sec. and at high temperature. Specifically, the device is designed for incorporation at the discharge of solid-gas reacting systems having low residence time requirements and carried out in tubular type reactors. Separation is effected by projecting solids by centrifugal force against a bed of solids as the gas phase makes a 180.degree. directional change, said solids changing direction only 90.degree. relative to the incoming stream.

Abstract: A centrifugal separator system for use in purifying drilling mud comprises a generally conical centrifugal separator into which drilling mud to be cleaned is introduced under pressure tangentially to cause centrifugal material flow. A vacuum generated within the center of the separator in response to centrifugal material movement draws lighter cleaned mud and drilling fluid upwardly to a discharge pipe which may lead to a remote drilling mud location. Heavier solids cleansed from the mud drop to the bottom of the centrifuge, settling on an output orifice closure valve. The valve is pivotally connected to the centrifuge whereby to close the output orifice until a preselected weight of material accumulates thereon. In order to prevent deleterious effects from suction variance, a single venting vacuum locking slot of a predetermined width is defined within the body of the orifice closure valve.

Abstract: An apparatus for separating fibre material from an air stream or current of a penumatic transporting system contains a filter or perforated drum internally of which there prevails a vacuum. The fibre material drops from the drum at a take-off zone or region, in the form of a fibre layer or mat, into a receiving container or the like. This fibre layer is then removed from the receiving container, by using a plunger, and deposited, in an outfeed or delivery duct or channel. The spacing of the fibre take-off zone at the drum from the bottom or floor of the container is limited to a value which avoids tearing of the fibre layer or mat. Jamming or clogging of fibre material when using a rotating filter or perforated drum is avoided, since the take-off of the dropping or outbound fibre layer from the filter or perforated drum is perfected cleanly throughout. There results the advantage that danger of fires and damage, caused by fibre jamming, are essentially precluded.

Abstract: A separator device, and a method, for removing water and foreign matter entrained in a compressed fluid is disclosed. The device includes a housing having an inlet port fluidly connected to the compressed fluid source, an outlet port and a chamber fluidly connected to the inlet and outlet ports. A mechanism is provided for separating water entrained in the compressed fluid and for collecting the separated water. Finally, a mechanism periodically purges the collected separated water from the device. The water is, preferably, atomized as it is released from the device.

Abstract: A particulate separation device having a particulate outlet structure for transporting particulate from a particulate-laden gas chamber to a main housing particulate outlet so as not to pass through individual cyclone separator units in said separation device.

Abstract: An air cleaner for an internal combustion engine, having a dust dumping valve. The air cleaner includes an outer housing containing a filter element and air is introduced into the housing and swirled outwardly before passing through the filter element for discharge. The heavier dust particles in the air are moved under centrifugal force to the inner surface of the housing and are discharged through a conical outlet in the lower end of the housing to a dust trap. The lower end of the trap is provided with a plurality of openings which are enclosed by a flexible rubber-like disc. When the engine is operating, the engine vacuum will draw the disc tightly against the openings to prevent the entrance of air into the trap. The weight of the dust collected in the trap in combination with the engine vibration will intermittently cause the rubber disc to drop away from the openings to discharge a portion of the collected dust.

Abstract: A liquid/gas separator for removing entrained liquid from a gas stream is mounted in the wall of a liquid holding tank and extends at least partially within the tank. The separator includes a gas circulation pathway and has a plurality of inlets through which the gas stream enters the circulation pathway. The inlets are arranged to impart a curved direction of flow to the gas stream. A fluid collection plate extends from the gas circulation pathway and is in fluid communication with it. The liquid collection plate is conical and provides a path of decreasing radius for the gas stream. The swirling motion of the stream over the collection plate causes a major portion of the liquid to separate from the gas and collect on the plate surface. The liquid collection plate has an opening formed therein through which the liquid can drain into the tank.

Abstract: Methods and apparatus for separating vapor from refined cellulosic material are disclosed. The method includes discharging the refined cellulosic material downwardly through an inlet opening into a discharge chamber maintained at substantially the same pressure as the refiner, deflecting the vapor laterally with respect to that cellulosic material, passing the vapor through the discharge chamber at a flow rate of less than 15 meters/sec. so that the cellulosic material carried by the vapor is separated from the vapor by sedimentation, and discharging the cellulosic material from the discharge chamber.

Abstract: This invention relates to an apparatus and method embodied in a TRC system for rapidly separating particulate solids from a mixed phase solids-gas stream which may be at velocities up to 150 ft./sec. and at high temperature. Specifically, the device is designed for incorporation at the discharge of solid-gas reacting TRC systems having low residence time requirements and carried out in tubular type reactors. Separation is effected by projecting solids by centrifugal force against a bed of solids as the gas phase makes a 180.degree. directional change, said solids changing direction only 90.degree. relative to the incoming stream.

Abstract: An air cleaner including a casing having an inlet for air to be cleaned and an outlet for cleaned air, a filter in the casing separating the inlet from the outlet, a shroud in the casing separating the filter from the inlet, a first valving arrangement operable to enable flow of air from said inlet to said filter or to disable flow of air from said filter to said inlet, and a second valving arrangement operable to prevent inflow of air to said filter or to enable a scavenge flow of air from said filter.

Abstract: The invention relates to a mobile dust collector for use in association with mobile equipment. The dust collector is adapted to be mounted on a common platform with the mobile equipment. The dust collector includes a bottom portion and a top detachment portion. Duct means extend from the bottom portion to the equipment for capturing air over and around the equipment.

Abstract: A dust separator, comprising a fan (27) with a drive motor (28), a cyclone separator (10, 11) which is connected to the suction side of the fan and is arranged as a coarse separator and provided with an inlet (11) for gaseous fluid mixed with dust, a filter (29-32) which projects freely coaxially into the cyclone apparatus (10, 11) and is arranged as a fine separator between the interior of the cyclone apparatus and the suction side of the fan, and an outlet (37) for cleaned gaseous fluid at the pressure side of the fan.The filter (29-32) and the suction fan (27) with the drive motor (28) are arranged as a separate unit resiliently connected to the cyclone apparatus (10, 11). The filter (29-32) consists of a pleated outer cover (30) of filter material which is disposed round a perforated tubular core (29) and which is clamped between its ends and the pleats of which extend axially along the core (29) and are fixed to this at their inner folding edges, while the outer folding edges are free.

Abstract: A workbench filtering station (10) includes a generally open interior in which a plurality of filter bags (50) are disposed to partially clean a gas stream. The gas stream is communicated to the bag filters (50) through an air intake (46). The air intake (46) is in the form of perforations in the side walls (44) of the filtering station (10). The station (10) includes HEPA-filters (60) which receive the partially-cleaned air from the bag filters (50). The HEPA-filters (60) clean the air to a clean-room environment. A fan (30) draws a constant volume of air through the filtering station (10) and exhausts the clean air into the room. In operation, a constant volume of air is drawn into the filtering station through the side intake panels. The air is communicated to a first filter station which is in the form of bag filters. The air is then passed through a HEPA-filter stage for further cleaning and exhausted to the room.

Abstract: The disclosure teaches a mobile dust collector which comprises a housing structure mounted on a trailer. The housing structure includes a filter chamber and a fan chamber. An opening in the side wall of the filter chamber communicates outside air with the filter chamber, and a plurality of filter bags disposed in the filter chamber make up the filter of the dust collector. A fan is disposed in the fan chamber, and the interior of the filter chamber is communicated with the fan. Wheels at the back of the trailer are adapted to rollingly support the trailer, and a removable support is disposed at the front end of the trailer for supporting the trailer when it is in a stationary condition. In operation, the housing structure stands in an upright position. Means are included for self erection of the housing structure.

Abstract: A separator for an air compressor to separate aqueous vapor and oil gas from an air stream in which air from a compressor is directed into a casing and onto a conically converging member disposed in a protective sleeve, the impingement effecting separation. The air then passes through a zig-zag shaped tube extending from the sleeve bottom and impinges on an L-shaped plate to effect more separation. The liquid accumulates in the bottom of the casing to which a transparent tube is connected for indicating the liquid level. The separated air passes to the casing outlet via a round tube having a screw rod therein to provide final separation.

Abstract: A method for binding dust generated when rock drilling, by mixing said dust with a liquid. The apparatus to perform the method includes a mixing chamber (6) connected to a dust-separating means (1, 3); means for passing gravitationally to the mixing chamber (6) batches of dust collected in the separating means; and means (12) for supplying a liquid binder to the mixing chamber in an amount corresponding to the size of the batch of dust in question. Arranged in the mixing chamber (6) are means (7, 8) for mixing the dust and liquid by agitation while the next batch of dust is being collected in the separating means (1). The resultant mixture is discharged prior to the next batch of dust being supplied to the mixing chamber.

Abstract: Disclosed is a granular bed dust collector system in which the granular bed of a filter panel is rejuvenated when necessary by interrupting the gas flow through the panel, withdrawing the granular filter media from the panel, dedusting the filter media to dislodge and separate the collected dust from the granules, returning the granular filter media to the filter panel, and reestablishing the gas flow through the panel. One filter panel or a plurality connected in parallel can be serviced, preferably sequentially, by a dedusting unit comprised of a plurality of surfaces which are inclined with respect to the vertical and are spaced both vertically and horizontally so that the filter media cascades from one surface to the other while the dust falls in between.

Abstract: A separator is described which includes an elongate vessel defining a chamber having a wall therein dividing the vessel into a gravity chamber and a filter chamber with the gravity chamber communicating with an inlet for receiving a contaminated gas stream containing foreign suspended particles and the filter chamber communicating with an outlet for discharging gas substantially free of foreign particles. A strainer-diffuser member having a conical side wall is inside of the gravity chamber and connected to the inlet whereby the conical side wall forms a bore converging longitudinally of the direction of gas flow from the inlet, said side wall having a plurality of holes with inner edge portions protruding inwardly in the bore and forming barriers to the flow of liquid particles over the inner surface of the conical side wall so that liquid accumulates and is jetted through the holes in liquid drops that fall to the bottom of the gravity chamber, the gas flowing through said holes into the gravity chamber.

Abstract: This invention relates to an apparatus and method for rapidly separating particulate solids from a mixed phase solids-gas stream which may be at velocities up to 150 ft./sec. and at high temperature. Specifically, the device is designed for incorporation at the discharge of solid-gas reacting systems having low residence time requirements and carried out in tubular type reactors. Separation is effected by projecting solids by centrifugal force against a bed of solids as the gas phase makes a 180.degree. directional change, said solids changing direction only 90.degree. relative to the incoming stream.

Abstract: An industrial vacuum cleaner is disclosed. The vacuum cleaner comprises a housing having an inlet port, means for creating a vacuum in the housing to suck dust into the housing, means located in the housing adjacent such inlet port for separating any liquid or snow which may be drawn up with the dust, and a filter, also located in the housing, for collecting the dust.

Abstract: A device for recovering powder, in particular from powder-spray housings, includes a filter unit mounted in a separate housing, which unit has at least one filter element mounted between the crude gas side and the pure gas side thereof. The pure gas side is coupled to an exhaust and a cleaning device is provided for the filter element for a continuous removal of the drawn-in powder. The filter element is moveable along a pure gas channel as an endless filter band fed around a drive roller and a tension roller. The band has opposed band portions which form the separation between the crude gas side and the pure gas side and which are subjected to a subsequent cleaning device.

Abstract: Energy or power is recovered from blast furnace exhaust gas by passing it through coarse dust removing mechanism, and then passing the gas through a dry moving bed type dust collecting mechanism for final dust removal, thereafter the blast furnace exhaust gas is supplied to a top pressure recovery turbine.

Abstract: Disclosed is an air cleaning apparatus having a rectangular enclosure with air inlet and outlet passages and internal lower and upper baffles which sequentially direct inlet air through lower and upper water curtains which are provided by a recirculating water system. The apparatus also has a separate scrubbing water system to wash the internal surfaces of the apparatus. In operation, the scrubbing system is periodically activated and the reservoir of the recirculating water system is periodically drained and refilled with fresh water. Also disclosed is the method of using the apparatus.

Abstract: An industrial loader vehicle, handling both wet and dry materials, has a single engine driving the vehicle to a pick-up site, powering all of the components to load the vehicle at the site, driving the vehicle to an unloading site and dumping the materials as desired at the unloading site. A powerful blower develops a high velocity air stream through a pick-up inlet conduit and a collector chamber tiltable on the vehicle for easy dumping of the collected material. A swingable and tiltable boom mounted on top of the collector presents the conduit for easy access to material located around and above the vehicle. The high velocity air stream sweeps the material through the conduit into the top of the collector chamber where it drops to the bottom of the chamber. The blower and surrounding environment are protected from materials entrained in the air stream by bag filters and cyclone separators mounted on the front end of the collector to tilt therewith.

Abstract: A compact, portable multi-stage vacuum particle separator with a first stage centrifugal separator, second stage linear separator concentrically mounted in the first stage, and a third stage air filter. All three separator stages deliver their separated particulate material into a common dump hopper. The second and third stages have flexible flap valves at their bottoms to automatically transfer accumulated, separated particles into the dump hopper when the unit is shut down.

Abstract: In apparatus for vacuuming particulate matter an enclosed housing includes at least one inlet for ingress of particulate matter and at least one outlet enabling air to egress from the housing, the inlet and outlet being oppositely disposed. A fan is connected to the at least one inlet and one outlet to generate a partial vacuum within the housing, and a cyclone is connected to the at least one outlet removing secondary particulate matter contained in the particulate matter. A duct interconnects the cyclone and a region of the housing spaced therefrom for conducting air from the housing to the cyclone. A duct inlet in the form of a slit extends transversely across the housing in the region of the at least one inlet.

Abstract: A filtering apparatus for filtering a fluid comprises two coaxial walls which are provided with openings for the radially-outward passage of the fluid to be filtered, granular filtering material being disposed between the walls. The fluid to be filtered is fed into the space bounded by the inner wall and the filtered fluid is abstracted from an annular chamber disposed about the outer wall. The inner wall is formed from a series of annular inclined vanes. A rotary shaft disposed coaxially within the inner wall carries blades which project between the vanes. The blades scrape deposited matter from the vanes and also scrape the radially innermost parts of the granular filter material from between the vanes. In accordance with the method of the invention, the filter material is emptied periodically from between the walls and this emptied material and the material removed by the blades is carried to a treating station for regeneration and re-cycling to the upper end of the space between the walls.

Abstract: A discharge valve assembly for use in dust collection systems is disclosed. The valve assembly includes a conduit (160) and a rotatable valve member (162). A rod (192) is connected to the valve member (162). The conduit (160) is formed of an elastic material and has a generally circular cross section. The conduit (160) also has an inner diameter (164) in an unstretched condition. The valve member (162) has a generally circular cross section and an outer diameter (178) which is greater than the inner diameter (164). The rod (192) has an axis spaced from a line bisecting the valve member (162) and is connected to the valve member (162) for rotation of the valve member (162) between a closed and an open position. In one embodiment of the invention, a plurality of discharge valve assemblies are disposed below a number of dust separator mechanisms (60,92). A discharge valve assembly can also serve as a suction or vacuum breaking means (158) in a multiple-stage dust collector system.

Abstract: A filtering separator, in particular a pocket or tube filter, of the kind in which smoke-laden gas containing dust particles of particularly great adhesiveness is fed into a dust collecting trough of a filter housing at the bottom and upwards towards filter elements and in which the filter elements are cleaned periodically by counter-current scavenging and/or joggling. A proportion of the settling dust agglomerated in the filter which corresponds to the amount of dust in the incoming smoke laden gas and which cannot be carried back to the filter surfaces by the smoke-laden gas is removed from said dust collecting trough.A lower part of the dust collecting trough is occupied by a longitudinally extending, rotatably mounted, perforated or sieve-like drum which is arranged to be filled with heavy bodies such as balls. The upper part of the drum is exposed and acts as a dust-collecting store or reservoir to which the smoke-laden gas is fed in order to flow transversely through the drum and its contents.

Abstract: A vacuum extraction cleaning machine adapted for coin operated applications. The cleaning machine comprises a remote cleaning tool for spraying cleaning solution upon an area to be cleaned and for extracting dirty cleaning solution through vacuum suction. Means located within the machine and coupled to the cleaning tool deliver vacuum and cleaning solution thereto. Used or dirty cleaning solution extracted by the tool is recovered and temporarily stored within a vacuum tank. Structure associated with the vacuum tank will automatically drain same when vacuum ceases at the end of the machine cycle. Injector valve means are provided to mix cleaning chemical with incoming fresh water to yield the necessary cleaning solution, and means are provided for coupling the machine to an external pressurized water source to facilitate operation.

Abstract: A filter dust ejector with a built-in check valve as part of the exhaust system of an internal combustion engine, the ejector consisting of an ejector housing with a suction connector for an air hose leading to the air intake filter, and inlet and outlet pipes forming an annular suction gap in a venturi-type exhaust flow profile, thereby creating a negative pressure in the ejector housing. The inner extremity of the suction connector is a valve seat for a pivotably supported flapper serving as a check valve which is closed, when a pressure condition in the ejector housing tends to create a reverse flow of exhaust gas through the suction connector to the air intake filter.

Abstract: An improved linear accelerator separator wherein much higher kinetic energy can be imparted to the particulate matter thereby significantly increasing the separation efficiency as compared to the prior art. In particular, the particles and airstream are rapidly accelerated and directed into an expansion chamber which is sufficiently long to permit the particles to expand or spread out and fall to the chamber bottom and to permit the airstream to lose velocity and to back up or turn around and exit from the chamber entrance.

Abstract: A valve assembly for controlling the flow of material in a duct such as a pipeline, outlet of a cyclone, nozzle and the like. The assembly is particularly suitable for controlling spiralling flows and includes a plurality of elongated valve members pivotally mounted at a first end to a support. Each valve member has at least two elongated and substantially planar sides extending from the first end to a second end. The two planar sides are joined to form a leading edge. The valve members are supported in an overlapping relationship and a mechanism closes the valve assembly by moving the second ends of the valve members toward each other. As the valve assembly closes, the leading edge of each valve member pivots about an axis and moves in a path along a plane extending radially from the axis of the valve assembly.

Abstract: A bin for pneumatically collecting paper chips comprises a chamber for receiving a stream of air containing paper chips and for collecting the paper chips. The chamber has inlet and exit ports so positioned as to cause a downward current of air to thereby compact the paper chips collected therein and means in the interior of the chamber for separating substantially all of the paper chips from the air stream and for collecting the separated paper chips in a lower portion of the chamber. The bin may also include means for opening a portion of the chamber to allow the collected chips to be removed from the chamber.

Abstract: An enclosed portable container for gravel and dust in a vacuum cleaning system, provided with at least two cyclone air cleaners, having a clean out door, and each cyclone is provided with its own clean out door, is skid mounted for pick up and carry to dumping areas, reducing the handling of collected dirt, gravel and dust. The separate air pump assembly provides motivating power for the vacuum cleaning system.

Abstract: There is disclosed an air filtering mask having a cyclone filter member attached to a mask body, the cyclone filter member including a hollow slotted cylinder section attached to the base end of a hollow frusto-conical section and a hollow vortex finder having a substantially cylindrical body and two ends, one end being radially connected and sealed to the interior wall of the hollow cylinder section and the other end being located within the base end of the hollow frusto-conical section, the cylindrical body of the vortex finder extending coaxially through and being uniformly spaced from the interior wall of the hollow cylinder section, the hollow cylinder section having a multiplicity of slots through the walls thereof, the multiplicity of slots being aligned to penetrate into the region between the hollow vortex finder and the hollow slotted cylinder section tangential to the interior wall of the hollow cylinder section, the frusto-conical section having an opening in the apex end thereof.

Abstract: A bag type air cleaning apparatus is described for collecting particulate sediment from a source of pressurized air. The apparatus is adapted for connection to the pressurized air source and receives the pressurized air within a cylindrical plenum. A plurality of upright pervious bags are openly associated with the plenum for receiving the pressurized air. The air and particulate sediment is forced upwardly into the bags and against the bag interior surfaces where the sediment will collect as the air escapes through the pervious material. The bags are mounted on upright frames that are collapsible for storage purposes. A sliding duct is provided in communication with a blower mechanism in order to successively clean the inside surfaces of the bags. The sliding duct includes a manifold that comes into contact with successive openings of the bags while being pivoted about within the plenum.

Abstract: An improved unitary fin structure for installation on the filter element of an air pre-cleaner and final filter for an internal combustion engine or the like. The improved fin structure includes self-biased lock tab elements forming an integral part thereof for securing the fin structure to a conventional air filter element while providing means for the non-destructive removal thereof from the filter element. An alternate embodiment of the fin structure of the present invention provides for the manufacture of the fin structure in a substantially flat strip with coupling means on the opposite ends thereof for assembling the strip into a substantially cylindrical configuration at the time of installation on the filter element. Various forms of coupling means for engaging the opposite ends of the strip are also disclosed.

Abstract: A drain device that removes oil, water, sludge and other contaminants from compressed air systems comprising a cylindrical housing for attachment between diametrically opposed compressed air and drain lines, a cylindrical rotor rotatably journalled within the housing, a single port, at least as large as the inside diameter of the air line, through the wall of the rotor, the port being positioned for sequential alignment with the air and drain lines, when the rotor is actuated and a pair of bleeder valves between the interior chamber of the rotor and the atmosphere including respective cam tracks positioned on end walls of the rotor and housing to open the valves when the rotor port is aligned with the discharge line.

Abstract: An industrial vacuum cleaning apparatus adapted for cleaning gravel and dirt from building roof tops while the unit is disposed on the ground including a vacuum container, a dumping container, a valve disposed between the latter two containers which opens intermittently in a timed sequence, a water filter unit for filtering contaminated air before exhausting it to the atmosphere and a programmed air control system for sequentially actuating various portions of the apparatus.

Abstract: A filtering arrangement for vacuum loaders, particularly for conveying pulverous materials. The upper part of a filtering container is provided with a cylindrical conveying filter for conveying air withdrawn from the filtering container radially through the conveying filter. A scavenging air filter, for the scavenging air flowing out of the filtering container during the cleaning operation, is arranged above the conveying filter and forms a scavenging air chamber with the inner wall of the filtering container, air flowing axially through the scavenging air chamber.

Abstract: A roof drill dust collector is disclosed which comprises a closed housing in which dust-laden air is carried through a first stage dust separator, a second stage dust separator, and a third stage dust filter, before being expelled to open air. The first and second stage separators deposit dust in first and second collection chambers having a common floor, being a hinged door. The housing has means therein for automatically, in sequence, spraying streams of water on the collection chamber walls, opening the hinged door to dump the collected dust, sending a reverse pulse of air through the third stage filter, and closing the hinged door.

Abstract: This invention relates to an improvement in an apparatus attached to an air cleaner such as of an internal combustion engine as in connection with a farm tractor wherein the contaminants drawn into the air cleaner are evacuated to the atmosphere therefrom by said apparatus wherein the improvement consists in having the apparatus continuously operative, providing a positive evacuation of contaminants and comprising a relatively small sized motor driving an impeller which receives contaminants from the air cleaner and evacuates or expells the same and embodies the use of a plurality of vanes whereby the engine associated with the air cleaner is prevented from drawing a reverse flow of air through the exhaust passage of the apparatus and the vanes serve as closure means whereby there is no open passage through the apparatus to the cleaner and thus only a low powered impeller is required to expel the comtaminants received.