Abstract: A cleaning arrangement for a bag filter that shakes the bags horizontally to effect removal of the dust particles that have collected on the surface thereof. A linear force electromagnetic motor is used to impart the horizontal movement to the bags whereby the frequency, amplitude and the duration of movement may be electronically controlled.

Abstract: Mechanical shaker assembly for filter bag supporting beams which eliminates problems involved with conventional shaker assembly linkage due to variations in the dimensions of the linkage members or the location of the bag suspension beams. The assembly includes horizontal beams mounted at their ends in bearings and the beams receive shafts attached to one end of the beams. Support hangers are attached to depend from the beams and the hangers are each connected to the upper end of a filter bag. Each of the shafts has attached thereto a lever arm and opposed lever arms are connected at their ends to length adjustable tie-rods. At least one of the lever arms is also connected by a length adjustable crank arm to a motor driven crank or eccentric.

Abstract: In pneumatic low pressure dust extraction apparatus, filter bags are cleaned by reverse flow of air. Each cleaning operation includes a first shock phase of short duration (not longer than 0.05 sec) but at high flow intensity by which accumulated layers of dust are thrown off the outside of the bag, followed by a rinsing phase of greater duration (not longer than 1 sec e.g. 0.20-0.30 sec) but at lower flow intensity during which remaining dust is blown out of the filter cloth and the cloth is allowed to lie back gradually on its support. The apparatus includes a cleaning-air tank incorporated in the filter housing for storage of compressed air in the close vicinity of apertures of the filter bags. The height of the tank exceeds its distance from the bag apertures. There is a valve for each filter bag and it has delivery means extending into the region of the bag aperture. The duration of the reverse flow for cleaning is adjustable for obtaining optimum results suited to the operating conditions.

Abstract: A filter medium for use in a vacuum cleaner is shown with external brush means which is movable across the filter face for cleaning the soil therefrom. The brush means may either be moved manually, by automatic controls, by time switches, by pressure differentials operating in a piston-cylinder arrangement, or by a pressure indicator unit which monitors the clogging condition of the filter. Moreover, control means are provided for protecting the vacuum cleaner drive motor from damage from liquids when liquids may be drawn into the vacuum cleaner.

Abstract: A dust collector for cleaning particle-laden air by means of a plurality of filter bags through which the air is passed. The dust collector includes an inlet chamber adapted to receive particle-laden air and an outlet chamber for clean air. The filter bags are supported in the outlet chamber with their lower ends communicating with the inlet chamber and with their upper ends supported by a shaker mechanism adapted to impart at certain selected time intervals a sinusoidal motion to the bags to dislodge accumulations of dust that form therein. The shaker mechanism includes a drive motor and a variable-throw, eccentric crank means. The inlet chamber has means at the bottom thereof for receiving and removing accumulations of dust, including the dust accumulations that are removed from the filter bags.

Abstract: Filtration apparatus in which the filter medium is mounted at a slope with respect to the horizontal and in which there are means to vibrate the medium in a horizontal direction to assist the cleaning of the medium. A single chamber may contain many sheets of media, one version of the apparatus comprises a plurality of separate modular structures each containing at least one filter medium and in another version modular structures are so designed that they assemble into a stack and when so assembled form the necessary conduits by which each filter medium communicates with the necessary inlets and outlets for the relevant materials.

Abstract: An air filter for use on internal combustion engines which operate primarily in heavy dust conditions, and which includes a mounting member as part of the air filter housing that permits the spinning of the air filter cartridge for centrifugal cleaning in place on the internal combustion engine, without removal of the filter cartridge from the air filter housing.

Abstract: Means for mounting a filter bag in a multiple filter bag assembly with means for maintaining the bag under tension while permitting transmission of shaking motion from a shaker mechanism to the tensioned filter bag, in which use is made of a shaker bar suspended for freedom of movement in a crosswise direction and having retainer plates through which tensioned hanger rods for the bags extend for relative vertical movement with means for actuating the shaker bar for movement in the cross direction and tensioning means connecting the hanger rods to a support.

Abstract: In a fluid passageway a filter panel is selectively moved out of its normal position extending across the fluid passageway to a dumping position out of the fluid passageway such that particulate matter collected thereon is removed responsive to the movement of a baffle plate from a normal position out of the fluid passageway into a position blocking the fluid passageway. Thereby passage of air through the fluid passageway is prevented during the time the filter panel is out of its normal position. In a preferred embodiment a linking mechanism connects the baffle plate and filter panel together so that movement of the baffle plate to the blocking position causes the filter panel to drop to a dumping position and return of the filter panel to its filter position causes the baffle plate to drop to its normal position. The whole sequence is instituted responsive to buildup of particulate matter on the filter panel.

Abstract: An apparatus for filtering particulate material from air and for removing the particulate material collected upon a filter is disclosed. The apparatus includes a housing having an air inlet and an air outlet. A hollow longitudinally extending filter is secured within the housing. The filter has an outer surface, an open interior, opposite ends, and a longitudinal axis extending between the ends. The filter is formed of a porous media. One end of the filter is removably secured relative to the housing so that the longitudinal axis of the filter extends generally vertically. The other end of the filter is closed. A first chamber is defined around the outer surface of the filter. The chamber is in communication with the air inlet whereby air moving from the inlet to the outlet passes through the filter into the interior thereof and deposits particulate material on the outer surface of the filter. A mechanism is provided for removing the particulate material collected on the outer surface of the filter.

Abstract: An apparatus for filtering particulate material from air and for removing the particulate material collected upon a filter is disclosed. The apparatus includes a housing having an inlet and an outlet. A hollow longitudinally extending filter is secured within the housing for filtering particulate material from the air passing from the inlet to the outlet. The hollow filter has a relatively rigid configuration but still is capable of being distorted. The hollow filter is formed of a pleated porous material. One longitudinal end of the filter is secured relative to the housing and a closure plate is secured to the other longitudinal end. A mechanism is provided for moving the plate to distort the filter and remove particulate material collected thereon.

Abstract: Apparatus is provided for cleaning a filter to permit continuous gas filtering operations. At least one filter is used in a gas filtering device to remove particulate matter from the gas. A support mechanism movably supports the filter. Urging apparatus is used in the device for urging the filter into a tense position. Releasable automatic moving apparatus is provided to automatically overcome the urging apparatus and moving the filter to a less tense position and thereupon released for returning the filter to the tense position thereby causing removal of particulate matter from the filter.

Abstract: A method for continuously maintaining a radiator free of debris comprises steps of rotating an endless and perforated belt about the radiator and simultaneously twisting the belt 180.degree. during each rotation thereof to form a "mobius strip" whereby the front and back sides of the radiator are each exposed to both sides of the belt during rotation thereof.

Abstract: A resiliently supported filter support plate, with tubular filters depending therefrom, is provided with an overlying rock shaft carrying rocker arms having depending hammer heads arranged to strike and jar the filter mounting plate to shake off the filter cake. A resilient crank arm is connected to the rock shaft and is provided with parallel, cantilever mounted leaf springs that receive an eccentric drive roller which oscillates the rock shaft through one or the other of the leaf springs and causes the hammer heads to strike the filter support plate before the striking stroke of the roller has been completed. The driven leaf spring is then deflected by the roller as it completes its striking stroke, further motion of the hammer heads having been interrupted by the filter support plate. On the hammer lift stroke the eccentric roller retracts the hammer via the other leaf spring.

Abstract: A bag filter for cleaning dust-laden gases comprises rows of vertically extending bags accommodated in a casing. Open lower ends of the bags are fixed to and communicate with a hopper which is separated from the inner space of the casing. Upper ends of the bags are closed by caps supporting vertical rods connected to a mechanism for removing dust from the bag cloth. The mechanism comprises pulleys fixed to the rods and two flexible drawbars having their ends secured to each pulley so that they run therefrom in opposite directions. Other ends of the flexible drawbars are secured to horizontal bars extending along the pulleys and having a drive for causing their longitudinal reciprocations for rotating the caps and twisting the bags to break up dust layers on the filtering cloth.

Abstract: An apparatus and method for cleaning air filter elements of the type used in heavy duty internal combustion engines. The apparatus includes a frame to support air filter elements in position for rotation, a blower for forcing air through the filter and the element in a direction opposite the direction of air and dust entering the housing during use of the filter, an agitator operatively associated with the frame for loosening dust which entered the housing during use of the filter, a suction for drawing air through the filter and the element in a direction opposite the direction of air and dust entering the housing during use of the filter, and a pair of rollers to drive the filter element for rotation.

Abstract: A plurality of perforated endless belts are disposed in circumventing relationship about a radiator. At least one roller is disposed on either side of the radiator to engage and guide the belts with one of the rollers being motor-driven. A vertically disposed guide bracket is mounted on the cooling air exit side of the radiator, intermediate the lateral sides thereof, to engage and guide the belts thereacross. An arcuate guide plate, having a plurality of holes formed therethrough, is mounted on the cooling air inlet side of the radiator to engage and guide the belts thereacross. In the preferred embodiment of this invention, each belt is half-twisted to form a "mobius strip" whereby the belt will turn over as it passes through the guide bracket to facilitate debris removal and to reduce cooling air pressure loss.

Abstract: A filter assembly for use in dust control apparatus wherein the filter assembly employs filter barrier material suspended between opposed end frame means. In order to remove accumulated solids from the filter, stroking means, such as a cam-cam follower arrangement or a rotary eccentric loading arrrangement are operatively coupled to the filter assembly to impart reciprocatory stroking motion to one of said opposed frame means and accordingly to the filter material. The length and frequency of stroking motion is selected so as to provide parametric resonant vibration to the filter material through alternate relaxation and tension generated along the length of the material.

Abstract: An air filter system for filtering solid particles from air, characterized by a plurality of flexible filter tubes having walls permeable to air and impermeable to solid particles, and mechanical means for shaking the filter tubes to dislodge any deposited solid particles from the tubes which means comprises a vibrating structure.

Abstract: A vertically oriented, sheet metal enclosure includes a frusto-pyramidal lower section forming a hopper for separated particulate matter from an air stream which enters a middle section from a downwardly and inwardly inclined inlet duct fixed to one side of that section at the upper end, causing impingement of the airborne particles against the side of the hopper to effect a swirling action to the air stream. An array of laterally spaced, inclined baffle plates at the upper end of the middle section separates the middle section from an upper section which carries tensioned tubular filter bags. An enclosure cover defines an outlet opening feeding to a cover mounted blower.

Abstract: An improved method for effective removal of collected materials, such as dust and fly ash, from the collecting plates of electrostatic precipitators and the like which induces simultaneous axial and transverse vibratory motions in each collecting plate with substantial coincidence of the maximum accelerations associated with the two motions. A natural frequency of the axial vibration 2n times the natural frequency of the transverse vibration for values of n in the range of 1 to 5 is most advantageous for material removal.

Abstract: In an air filter unit, after dust collected by the filter bag is shaken off and exhausted and before normal operation is effected, the air inside the filter chamber but outside the filter bag is fed into the filter bag or a separate dust collector, thereby preventing dust particles from being discharged into the atmosphere along with the clear filtered air during the initial stage of normal operation. Other advantages and details in the construction will be made clear.

Abstract: Impacting devices are provided to strike the sway frame which supports the filtering bags in a bag house. The impacting devices each include a stationarily-mounted bracket, an externally-threaded sleeve that is adjustably received in the bracket, a bolt-like striker member slidable in the sleeve and a coil spring which biases the striker member to an extended position relative to the sleeve.

Abstract: A cleaning arrangement for a bag filter in which the bags thereof are subjected to a recipricatory motion as effected by an electro-magnetic attraction whereby a collection of dust clinging to the outer surface thereof is jarred free and caused to fall to the bottom of a surrounding filter housing from which it may be removed.