Abstract: The vertically suspended filter bags of a dust collector are periodically shaken in a bi-modal manner, to removed adhered dust. Repetitious motions applied to the closed bag bottoms are comprised of a long lifting stroke, to partially fold the bags, followed by one or more short strokes of higher impulse, to simulate a rapping or hammering. Apparatus which effects the process includes a motor driven cam that lifts, and then drops, a shaker bar mounted transversely to the bag bottoms, and a device for stopping the cam in a position which leaves the bags hanging freely for further collection of particulate.

Abstract: An apparatus and process are provided for removing particles from an air stream by filtration, particularly wood particles which have been treated with a resinous material, and which therefore are somewhat sticky. The apparatus is a filter system in which an air stream carrying the resinated particulates is directed upwardly through a set of filter elements which are arranged in a generally sawtooth pattern. The filter elements include a relatively large mesh screen to which the sticky particulates adhere and form of a filtering layer on the mesh in situ. As the filtering layer grows, its porosity is continually reduced, until it reaches a minimum acceptable level, at which time the filter elements are vibrated to cause a portion of the filtering layer to fall away, leaving a portion of the layer adhering to the filter element. In this way, continuous, high-efficiency filtering of a sticky particulate from an air stream is achieved.

Abstract: A self-cleaning air filter is formed by placing a flexible filter bag in an upside-down position with its open end firmly supported. Air to be cleaned is pulled upwardly through the bag. When the air stream is shut off, the bag collapses, discharging accumulated particulate material into the space beneath it.

Abstract: A vacuum consisting of a canister housing that is open across its top end and is arranged to be covered by a removable lid, which lid mounts a vacuum source. The canister housing includes a hose port for connection to a hose that mounts a nozzle on the end thereof, which hose and nozzle are preferable formed of a fireproof or flame retardant materials that will not be damaged by a passage of warm, hot and even burning coals therethrough. Which canister housing can be mounted on wheels, casters, or the like. A double filter system of the present invention is arranged within the canister housing, attached to the lid undersurface, to extend across the vacuum source inlet, which filter system consists of an inner or secondary filter for closely fitting across the vacuum source inlet, and is primarily a dust filter, with an outer or primary filter mounted to the lid, over the inner or secondary filter, with an open box frame arranged therebetween.

Abstract: An improved means is provided for emptying dust and debris accumulated in the air filter box of a surface maintenance machine having vacuumized dust control.

Abstract: An improved air filtration apparatus of the rotary prefilter type having a rotating filter screen disposed in a wall of the filter housing is equipped with a constricted suction nozzle which is reciprocable radially across the rotating filter surface to remove debris accumulated thereon. Operation of the suction nozzle is controlled in relation to the pressure drop across the filter to maintain the pressure drop within a predetermined desired range.

Abstract: A sweeper hopper and associated filter assembly as illustrated and described. The filter assembly effectively divides the hopper into a particulate contaminant receiving chamber and a clean air exhaust chamber. The filter assembly includes at least a pair of particulate blocking filter means and means for selectively directing the transient air stream through one or the other or both of the filter means. The filter assembly further includes cleaning means for selectively imparting the filter means, typically during periods of quiescence, to physically loosen and remove particulate contaminants therefrom and direct such contaminants into the contaminant receiving chamber.

Abstract: A filter cleaning apparatus for cleaning air filters such as the air filter on the Abrams M-1 tank, which apparatus includes a cabinet fitted with an air exhaust system, brackets for receiving one or more air filters and an air supply manifold, air inlet manifold and sweep manifold for directing streams of air on the inside and outside element surfaces of the filter or filters and removing dust and dirt lodged in the filter elements. In a preferred embodiment a vibrating mechanism is built into the floor of the apparatus for vibrating the filters while simultaneously directing the streams of air on the inside and outside filter element surfaces and evacuating the dislodged dust and dirt particles from the cabinet.

Abstract: To facilitate removal and insertion of filter units from a filter frame structure without need to gain access to the dust side of the filter assembly there is provided a filter frame structure having a support plate formed with openings through which filter units may pass and support bars underneath the support plate to support each filter unit in the region of a respective opening. A removable seal plate is arranged therewith and clamp means is provided for lifting the filter units from the support bars to bring them into sealing engagement with the underside of the seal plate.

Abstract: The filter unit is of the type comprising a casing (2), filter tubes (5) associated with a filtering surface (6), shaker means (7) for the filtering surface (6), a suction pipe (10) associated with the casing and a suction pipe (11) associated with one or more turbines and characterized in that the casing (2) comprises above the filtering surface (6) at least two separate chambers (13,13') each independently connected to the suction pipe (11) associated with one or more turbines.

Abstract: A self-cleaning filtration system for removing particulate matter from a particulate laden gas flow includes a housing having an upper end opening for receiving the gas flow, a lower end opening communicating with the interior of a large particulate receiving container positioned beneath the housing, a vertical internal passage extending between the upper and lower end openings, and a vertically spaced plurality of side wall openings communicating with the internal passage. Coaxially supported within the internal passage is an open-ended, flexible tubular filter element through which the received gas flow downwardly passes. During filtration system operation, a major portion of the downwardly flowing gas is forced laterally through the filter element, and is flowed outwardly through the housing side wall openings as cleansed gas, while a minor, unfiltered portion of the gas flow is downwardly discharged into the container.

Abstract: A bag separator having a bag housing containing a moveable bag head supporting a plurality of depending filter bags includes a bag shaker which may be readily provided for either manual or power operation. Parts of the shaker mechanism are common to both the manually operated bag shaker and the power driven bag shaker so that a manually operated bag shaker may be easily retrofitted for power operation.

Abstract: A filter element for removal of particulate matter from a flow of gas has a plurality of elongate fluid flow passages each defined by porous gas filtration material and arranged as an integral assembly in which the passage lie side-by-side to extend parallel with one another between end regions of the filter element, at least one end of each elongate passage being sealed to prevent free flow of gas to or from the passages, the elongate passages being defined by self-supporting walls of porous gas filtration material and the filter element being substantially rigid or semi-rigid so as to attenuate transverse vibration by no more than 70% between an end of the filter element and a position mid-way between its ends.

Abstract: A dust filtering and collection system for filtering dust particles from an incoming dust laden air stream is disclosed. When used is a mobile vacuum loading/unloading vehicle, the system separates dust particles from the incoming dust laden air stream in a dust filtering and collection canister or chamber and then exhausts the dust cleansed air stream from the canister or chamber. Dust particles filtered from the dust cleansed air stream are collected as accumulated product particles along a bottom area of the canister or chamber. The accumulated product particles may then be transferred to a storage chamber from which the incoming dust laden air stream has emanated.

Abstract: A cyclone separator having a manually operable bag shaker mechanism including a vertically oriented shaker rod supported on the top wall of the separator housing for vertical reciprocal and rotational movement relative to the separator housing. A filter bag disposed within the housing is suspended from a shaker bar mounted in fixed position on the lower end of the shaker rod. A compression spring received on the shaker rod acts between the top wall and a knob secured in fixed position to the upper end of the shaker rod. When the spring is compressed and released in its compressed position in response to a downwardly directed force on the knob a plurality of shaking cycles are produced which dislodges dust and other caked particulate material from the filter bag. The knob may be turned in either direction about its axis to twist the filter bag and thereby dislodge material from it.

Abstract: A powered surface maintenance machine having an exhaust air system for dust control is equipped with air filters for removing dust from the air before exhausting it to atmosphere. Automatic means are provided to mechanically shake dust from the filters whenever enough has accumulated on them to adversely affect dust control. This filter cleaning is accomplished with no attention from the machine operator and does not interrupt the operation of the machine or the air flow needed for dust control.

Abstract: A dust collector housing or baghouse is modified to provide for the removal of increased length filter bags and support cages by providing a removable roof section which is connected to the main housing section by cooperating inwardly projecting flanges formed on the upper transverse edge of the housing section and a lower depending side wall of the roof section. The flanges are accessible from the clean air plenum within the baghouse for insertion and removal of flange connecting bolt assemblies.

Abstract: A compact pneumatic air filter system for filtering conditioned air laden with dust and reusable debris is disclosed, which has an initial filter stage for collecting reusable debris from air and separately storing it for reuse, and a secondary filter system for collecting remaining dust from air for disposal and re-releasing conditioned air to a work environment. The system utilizes alternating positive and negative air pressures to move debris and dirt to appropriate storage spaces within the system, and to move filtered air back into the work environment by migration through filter walls, thereby retaining the conditioned property of the filtered air.

Abstract: There is provided a filter element for filtering fluids. The element consists of a body member having at least two openings provided, respectively, access and egress for the fluid and a plurality of fibers of a substantially uniform orientation over at least a portion of their active lengths along which portion at least each of the fibers is disposed in close proximity to its adjacent fibers. The invention also provides a flushable filter device incorporating the above described element.

Abstract: A dust filtering and collection system for filtering dust particles from an incoming dust laden air stream is disclosed. When used in a mobile vacuum loading/unloading vehicle, the system separates dust particles from the incoming dust laden air stream in a dust filtering and collection canister or chamber and then exhausts the dust cleansed air stream from the canister or chamber. Dust particles filtered from the dust cleansed air stream are collected as accumulated product particles along a bottom area of the canister or chamber. The accumulated product particles may then be transferred to a storage chamber from which the incoming dust laden air stream has emanated.

Abstract: In the case of a filtering separator, the housing of which is divided by a perforated partition into a filter space and a pure gas space the filter space being supplied with unrefined gas, receiving filter elements which are to be cleansed by counterflow flushing and/or agitation, and having a bottom dust collector trough incorporating a dust extraction conveyor, the dust obtained being partly fed to the filter elements again with unrefined gas, the dust collector trough is provided in the area of its dust extraction conveyor with at least one opening leading to an unrefined gas guiding space which is situated at a lower level and connected to the filter space at the top or side, the lower section of which has disposed in it a loosener for the downwardly dropping dust, via which the incoming unrefined gas flows into the unrefined gas guiding space.

Abstract: An apparatus for cleaning air filters by a combination of vibration, air pressure, and suction. A support member includes a first inclined wall sloped more steeply than a second inclined wall, providing generally V-shaped supporting surfaces which cause the filter being cleaned to rotate as it is vibrated. The vibration of the filter also loosens trapped impurities therefrom, and this vibration is enhanced by resiliently suspending the support member from a housing. The loosened impurities fall down the slopes of the inclined walls and are removed by suction provided in a channel extending lengthwise along the bottom of the support member. An exhaust blower is connected to a port in the suction channel to apply suction to the filler and to remove loosened impurities. The exhaust blower is also connected to an inner suction tube, which applies suction to an inner periphery of the air filter.

Abstract: In the filter according to the invention (precoated filter), gap-type filter elements (11) designed in the manner of filter cartridges and consisting of a profile wire wound into a helical spring are used. In order to detach the adhering filter cake, the gap-type filter element (11) is stretched in its axial direction, with the filter gaps being opened at the same time, this appropriately being carried out be means of a stretching drive which at the same time can be designed as a vibratory drive. The gap-type filter elements are at the same time made to vibrate, and this can be obtained by means of periodic stretching and shortening or by making the stretched gap-type filter elements vibrate. The vibratory movement is appropriately executed at a frequency matching the natural frequency of the gap-type filter elements.

Abstract: Method and apparatus for filtering air are disclosed. A preferred cabinet collector (10) according to the invention includes a housing defining an upper chamber (b 20a) and a lower chamber (20b). Separating the chambers (20a, 20b) are a pair of wedge-shaped filter assemblies (38, 38'). First ends (42, 42') of the filter assemblies (38, 38') are attached the housing wherein second ends (44, 44') are free. Provision is made to automatically periodically move the second ends (44, 44') to clean the filter media, filter displacement apparatus "snapping" the filter assemblies (38, 38') and another displacement apparatus "vibrating" the filter assemblies (38, 38') to achieve the desired media cleaning.

Abstract: This is concerned with an air filter cleaning arrangement in which the filter element, meaning the pleated filter media and its frame, is functionally connected to a vibrator so that it is resiliently or vibrationally isolated from the surrounding structure. The major effective component of the vibratory motion applied to the filter media is across the width of the filter pleats. The invention is used primarily in an industrial sweeper. It can also be used in other machines or equipment which have air filter.

Abstract: Product, such as grain, is cleansed of particulate, such as dust, as it is being conveyed in the normal receiving, storage, and shipping processes. The particulate is sucked from the product by large volumes of low velocity air. The particulate is sucked from the product at a time that the product is near a port in the side of a discharge transition of the conveyor. It is sucked at the discharge transition because at that point, the grain is in motion and agitated, as well as being near the walls of the conveyor. Furthermore, the conveying of product will create a wind or movement of air which airs the sucking of the particlate from the product. The fan causing the suction is placed as near as possible to the conveyor so that the air and particulate, once removed, is moved through the particulate pipes under pressure rather than under suction. Also, all of the particulate pipes carrying the particulate and air are at an angle greater than 55.degree.

Abstract: In a rotation granulator, the injection nozzles for the powder are provided along the jacket surface of the granulator container over the rotary table, so that the powder will arrive directly in the range of the stronger flow. In order to prevent any interruptions of the operation due to the filter part, a two-chamber system is proposed in which the first and second chambers may be alternately cut off. This makes it possible to operate the installation without any interruption. In order to control the air supply, the rotary table is mounted so that it may be moved up and down, in order that the width of the air gap between the rotary table and the inner wall of the conical casing may be adjusted. Lastly, a device for taking of samples provides a system of sluices or channels by which the low-pressure space of the granulator is actively prevented from being in direct contact with the free atmosphere.

Abstract: Metal candle-type gap filters are used to remove particles from a hot gas stream containing sulfur oxides so that, in the filter cake which is built up upon the candle filters, the sorption reaction can continue as the hot gas stream passes through the filter.

Abstract: A pressure vacuum valve arrangment for the fitting to the vent pipe of a tank for the storage of volatile fuel comprises a first valve to open on increasing pressure of the tank to allow escape of air and vapors from the tank and a second valve adapted to open on decrease of pressure in the tank due to withdrawal of fuel to allow air to enter the tank. To the top is fitted a sleeve forming a venturi action to disperse the vapors into the atmosphere, and to the entry of the second valve is provided a bag filter to prevent dust entering the tank.

Abstract: Particulates which are less than and greater than a predetermined size and are entrained in a fluid are separated according to their respective sizes by passing the fluid and entrained particulates through a porous, crossflow separator element while continuously vibrating the separator element to prevent buildup of particulates on the upstream side of the separator element.

Abstract: The present invention relates to a filter cleaning device, preferably for the cleaning of gases, such as welding fumes. To provide a filter cleaning device which efficiently cleans the filter without need for dismounting it, the filter cleaning device comprises at least one rotary filter (10) with outwardly directed projections (17), and at least one impeding device (12) which upon rotation of the filter (10) causes the projections (17) to give way and permits them to revert, whereby a shaking movement is imparted to the projections (17) to make them shake off the impurities adhering to them and toss the impurities aside by the action of the rotation of the filter (10).

Abstract: In a mechanical shake type fabric filter having a reciprocable shaker rack (10), a plurality of filter bag support caps (14) suspended from the shaker rack (10) and a fabric filter bag (11) suspended from each cap (14), the improvement that each cap (14) has a staple (16) formed on its upper surface which is releasably engaged with a hook (19) formed on the lower end of a support bar (17) which extends vertically through an aperture (18) in the shaker rack. The bar (17) may be retained in any vertical position relative to the shaker rack (10) by a spring clip (22) which is slidably positioned on the bar (17) but is deformed so as to frictionally engage the bar (17) when it contacts the shaker rack (10).The arrangement allows rapid adjustment of bag tension and simplified bag replacement.

Abstract: An improved filter bag assembly is shown for use in a filter bag housing having a plurality of filter bags, each of the filter bags being anchored at a lower end and being suspended within the bag housing in a tensioned relation by an upper end thereof. A bag spring is provided having a central coil, and a pair of angularly arranged spring sides extending outwardly from the coil. A hanger bracket is used to suspend the bag spring by engaging a selected spring side and the opposite spring side is engaged by a flexible strap attached to the bag upper end. The bag spring is tensionable between tensed and relaxed positions by applying force to the flexible strap free end, whereby relaxing the spring serves to tense the filter bag.

Abstract: The present invention relates to a single-chamber or multichamber bag filter apparatus including horizontal and cross-sectionally flatly oval filter bags, each of which being provided with a rigid internal spacing element terminating at a distance before a perforated wall separating the dust gas side from the pure gas side and being loosely supported thereat. The filter bags including the spacing elements are releasably connected at their closed extremity to supports of an auxiliary wall springily mounted in front of the rear wall of the housing, and this auxiliary wall is coupled to an oscillation generator.

Abstract: A self-cleaning impingement type air filter unit is mounted on a flexible elastomeric support member comprising an end wall of a filter housing exposed to the pressure differential between the interior housing chamber and the ambient pressure of the clean air discharge conduit. A standard pleated paper type porous media filter element is mounted on the flexible wall member and includes a support plate on which a mechanical vibrator is mounted whereby the complete filter element is mechanically oscillated to dislodge accumulated material on the surface of the filter media. The filter support structure includes a mounting flange which is adapted to be supported on a filter housing by yieldable springs which permit movement of the entire filter element and support structure to function as a pressure relief valve to limit the pressure differential across the filter housing.

Abstract: A gas cleaning installation, such as might be used to filter particulate material from exhaust gases of a power generating boiler or the like, which comprises a pair of gas cleaning chambers each containing filtration means for a gas stream passing through the installation. The chambers are spaced apart to define between them a gas inlet passage or passages into the underside of each chamber and, above, the inlet passage or passages a gas outlet passage or passages. The gas outlet passage or passages together include a portion extending at least part way across the upper end of each chamber, the outlet passage or passages communicating with each chamber through an aperture extending between the interior of the chamber and the interior of the respective portions of the gas outlet passage or passages.

Abstract: A compact, self-cleaning, cabinet, dust collector is provided. The collector housing is a single-piece, molded unit having recessed areas and a molded air inlet. Entering dust-laden air is directed into two flows in a passageway surrounding a suspended, flexible, pleated filter element. An inner wall of the passageway contains a precleaner upstream from the filter element. A collector ramp, at the bottom of the passageway, directs pre-cleaned matter to a removable hopper. A fan, supported above the open upper end of the filter element draws air through the collector. A fan motor is isolated from the housing interior in one of the recessed areas of the housing. To gain access to the filter element the fan is rotated upwardly and away from the filter element. To prevent the pleats of the element from collapsing, hot-melt spacers are provided on the pleat surfaces. The element is flex-cleaned by a rotatable mechanism located beneath and adjacent the bottom closed end of the element.

Abstract: A continuously cleaned bag filter provides a second filter stage for removing dust from air discharged from a cyclone or other primary separator. The primary separator removes the majority of particulate matter from air delivered thereto. In the bag filter dust is filtered from the air, which is discharged through the filter walls. The filtered dust is conveyed along the bottom of the bag filter by an air conveyor and is recirculated back to the primary separator for removal thereat. The air conveyor and a recirculating air blower, the latter providing impetus to carry dust back to the primary separator, are balanced relative to the inflowing air to the bag filter from the primary separator; such balance prevents excessive back-pressure or negative pressure in the filter bags that would otherwise interfere with ordinary air discharge therefrom.

Abstract: A filter apparatus for filtering particulate matter from gas streams and which comprises a shaker rack suspended from a frame and supporting a plurality of filter bags and means to cause the rack to move reciprocally along a linear path wherein the shaker rack is suspended from the frame by a plurality of leaf springs which lie in parallel planes which planes are normal to the said linear path. The arrangement stops shimmying of the shaker rack during its reciprocal movement.

Abstract: A plural bag dust collector filter apparatus for filtering air to remove dust and similar contaminants therefrom including a plurality of vertically elongated tubular cylindrical upwardly opening filter bags and respective associated shape-maintaining skeletal cylindrical wire cages inwardly lining the filter bags arranged in transversely plural longitudinal rows of plural filter bags each in a box-like chamber, and a shake-down mechanism comprising vertically elongated beater rods located respectively within and depending substantially throughout the vertical height of the respective filter bag cages and their associated filter bags. Rotatable crank arms pivotally coupled to the opposite ends of supporting bars for the beater rods and a powered drive therefor are provided to impact the beater rods inwardly against their associated cages and develop sufficient force to dislodge dust build-up on the surfaces of the filter bags.

Abstract: Surface maintenance equipment is disclosed including mechanism for moving an airstream therethrough and a filtering device for cleaning the airstream prior to discharge into the atmosphere. The filtering device includes a conventional filter and a screen. The screen removes larger airborne pieces such as grass clippings.

Abstract: Apparatus for filtering entrained particulate matter from a gaseous fuel embodies an upstanding housing having a hopper adjacent its lower end for receiving dislodged particulate matter. At least one upstanding, porous tubular filter bag is mounted within the housing. The ends of the filter bag are attached to the housing with its length being greater than the distance between the points of attachment of the ends to the housing. An inlet communicates with one end of the filter bag for introducing a gaseous fluid with particulate matter entrained therein. Particulate matter carried by the gaseous fluid is deposited on the inner surface of the filter bag with cleaned gaseous fluid passing therethrough. An outlet communicates with the housing and discharges the cleaned gaseous fluid.

Abstract: A sweeping machine is disclosed including a planar pleated filter and a striking mechanism for removing collected dust from the pleated filter. The striking mechanism includes an elongated strap with resilient pad which overlies the pleated filter. A rotatably driven eccentric weight drives the strap and pad to strike the upper surface of the pleated filter.An industrial filter device is disclosed including a planar pleated filter and a striking mechanism for removing collected dust from the pleated filter. The striking mechanism includes an elongated strap which overlies the pleated filter. A rotatably driven eccentric weight drives the strap to strike the upper surface of the pleated filter.

Abstract: A bearing assembly for supporting one end of a shaker shaft from which a plurality of filter bags are suspended in a baghouse. The bearing assembly includes a stationary bracket mounted within the gas cleaning chamber of the baghouse, a supporting member having an upwardly extending knife-edge portion generally aligned with the longitudinal axis of the shaft and pivotally connected to the bracket for movement about a horizontal axis extending perpendicular to the axis of the shaft, and a shaft supporting block affixed to the end of the shaft having an inverted V-shaped notch sized to be received on the knife-edge portion to support the shaft in a manner accommodating axial and angular displacement of the shaft with respect to the stationary bracket of the bearing assembly.

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 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 dust collecting apparatus with quick release filter support system comprising an enclosure, a bulkhead structure mounted to the interior walls of said enclosure, and defining upper and lower portions of said enclosure, means for the intake and exhaust of air from the surrounding environment in a single direction, a filter cloth assembly comprising a filter cloth affixed to and supported by a frame assembly inserted into said enclosure, and quick release clamping means used to bring said frame assembly into an air tight sealing arrangement with said bulkhead.

Abstract: A device for the groupwise cleaning of filter tubes in a filter assembly in which the tubes are disposed in a plurality of parallel rows with each tube being connected to a rod forming a tube carrier and having a seat upon which a spring bears. The other end of each spring engages an arm of a rocker which acts upon two rows of tubes.

Abstract: A filter assembly (10) adapted for use with a gas sample analyzing system. The filter is in the form of a flexible sleeve (20) formed from a heat resistant ceramic material which is received on an adapter (12) which fits over a probe (14) of the analyzing system. A V-shaped deflector plate (18) is attached to the adapter (12) beneath the filter and prevents the gas flow which is being sampled from impinging directly on the filter. The deflector plate (18) also sets up gas currents around the filter which cause the filter to flex or flutter, thus dislodging particulate material which tends to become trapped in the filter material.

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.