Abstract: An improved tubular filter bag of two piece construction, one piece being coated with a flexible and abrasive resistant coating, the coated piece being in communication with a flow-through inlet for absorbing the impact of the bag during cleaning. Also disposed at approximately the maximum impact point of the filter bag is a support member to restrict flexing of the bag during cleaning.

Abstract: A gas filter element comprising a holding frame and a plurality of self-supporting wedge-shaped filter pockets each having its wide end open and secured to said frame, each element comprising a pair of substantially symmetrical pocket halves secured to one another along the wedge edge and centrally along the opposite wedge end faces, and a plurality of laminar spacing elements with each pocket extending from adjacent the open end toward the wedge edge, each spacing element being secured to the opposite inclined wedge faces, each filter pocket being rendered self-supporting by the securing of the sub-elements to one another and the securing of the spacing elements to the pocket. Advantageously the filter pockets each comprises fusible fibers, the pocket halves being joined to one another by fusion and the spacing elements being secured to the pocket by fusion.

Abstract: A plurality of elongated tubular porous bags are arranged in a straight line side by side in a housing through which a dirty stream of gas is passed impinging on the outer surfaces of the bags and thus collecting dirt particles there. In the middle of each bag, extending from end to end thereof, is an impervious linear partition dividing the interior of each bag into two non-communicating half portions. To clean the collected dirt off the outer faces of the bags, means is provided for discharging a cleaning stream of gas into two adjacent selected half portions of two different bags under sufficient pressure to pass outwardly through the half portions and dislodge the dirt collected on the outer faces of those half portions, while the apparatus continues to collect direct particles on the other bags including the other half-portions of the two bags currently being cleaned.

Abstract: In a bag house, the flat cell plate has integral annular walls drawn outwardly from the plane of the cell plate, the walls each terminating in a lip forming a circular opening lying in a plane parallel and spaced from the plane of the cell plate. Vertical tubular filter bags are secured to the cell plate by a spring in each bag which forces an outwardly facing groove on the open end of the bag into engagement with the lip to which the bag is attached.

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: A vacuum cleaner filter bag for an upright vacuum cleaner comprising an air pervious filter receptacle and an air impervious feed tube interconnected together so that the interior of the filter receptacle is in air-flowing relationship with the interior of the feed tube, where the feed tube is adapted to be connected to the vacuum cleaner. A collar is intermediately disposed within the filter receptacle and secured therein by a clamping ring disposed externally of the filter receptacle in juxtaposition with an upper portion of the collar. An air impervious dust receptacle is removably disposed within a lower portion of the filter receptacle with a mouth portion of the dust receptacle being disposed about a lower end of the collar. A resiliently expandable ring releasably secures the dust receptacle mouth portion about the collar so that the dust receptacle is maintained in an open mouth suspended condition within the filter receptacle to receive and collect debris introduced into the filter receptacle.

Abstract: A filter cloth for a leaf filter of a pressure vessel including a flat retaining sack or bag which encloses the leaf filter. An outlet opening is contained in the sack through which the filtered product can be extracted. A releasable closure device is provided along the greater part of one side edge of the sack to permit removal of the sack from the leaf filter for cleaning and replacement thereof. A reinforcing material is provided at the outlet opening to provide a tight seal about the outlet of the leaf filter. Preferably, the sack is substantially circular but may have any configuration conforming to the shape of the leaf filter.

Abstract: A filter bag which includes an annular thin-walled band having a plurality of discrete resilient tabs extending from its outer surface along two axially separated paths. A flexible collar is secured to the outer surface of the band and conforms to the shape of the tabs to provide discrete protrusions along the two paths. The band and collar assembly is secured to one end of the filter bag. The end of the filter bag can snugly fit into a socket of a cooperating member, whereby a portion of the socket is positioned in the space between the two separated paths and is retained by the protrusions disposed on either side thereof. The retained portion of the socket includes an enclosed annular ring.

Abstract: An industrial sweeper has a filter unit in the debris hopper with the filter unit comprising rows of cartridges having pleated paper filter elements that are cyclically cleaned by reverse jet pulses of air without interrupting the filtering action by the main blower.

Abstract: A bottom removal type of filter bag assembly for reverse blow-back type dust collectors is mounted on a permanent support structure that is welded in place to a depending integral collar portion of the dust collector tube sheet. The permanent support has a stepped diameter wall structure having a reduced upper end portion for force fit insertion in the tube sheet collar and having an intermediate shoulder to engage axially against the end of the collar.

Abstract: A vacuum cleaning or loading device of the type including a means for filtering airborne fine particulate material also includes a back-up filter system for protecting the vacuum exhauster or blower. A by-pass system may preferably be used with the back-up filtration system to protect the primary filter media when the cleaner or loader is being used for collection of liquids. The device may be self-propelled or stationary and may be used for various collecting, loading, transportation or cleaning jobs.

Abstract: A vacuum cleaner including a tank having an interior space for receiving dirt and debris, the tank providing an access opening, a blower assembly including a housing for closing the access opening, the housing providing, within the boundary of the access opening, an intake port for the tank, and the blower assembly including a motor and a blower for drawing air from the tank to create a vacuum therein. An impermeable flexible bag is disposed in the tank to provide a lining, the bag having a mouth in registry with the access opening such that dirt and debris entering the intake port are deposited into the bag. The bag has at least one vent opening therein for establishing venting between the interior of the bag and the space between its exterior and the internal surfaces of the tank to equalize the air pressure within the bag and the tank or the bag is disposed in the tank in such a manner as to establish such venting and equalize the air pressure.

Abstract: An elongated tubular filter element prevents certain types of fluffy foreign matter entrained in an airstream admitted into the filter element from clogging the outlet of the tube during operation of a separator in which the filter element is installed. A major portion of the length of the tube tapers at a predetermined rate from one end, and a minor portion of the length tapers at a greater rate adjacent the other end of the tube to provide the tube with a flare at one end. The filter element is installed in the separator with its flared end down, so that the foreign matter falls freely through the bottom of the tube during operation of the separator or during cleaning of the tube.

Abstract: An improvement in air filtering apparatus of the type having means for providing intermittent reverse flow of air through the filter media of the apparatus to dislodge any accumulations of material from the filter media. Such apparatus is conventionally formed with a collecting air chamber receiving the air to be filtered, which is then fed to a filtered air chamber separated from the collecting chamber by a grid plate with air passages therethrough. Filter media such as filter bags or the like are arranged in the grid plate air passages to filter the air passing through to the filtered air chamber. The invention provides an improved air plenum blower fan arrangement providing a relatively straight reverse air flow path from the fan discharge to improve the efficiency of air transfer between the fan and the filter media to effect desired cleaning of the filter media.

Abstract: A vacuum cleaning system includes a stationary built-in power unit, a portable vacuum unit, and a flexible hose connecting the power unit and vacuum unit. Dirt and other particulate matter sucked into the system is trapped within a collection chamber of the vacuum unit and air within the collection chamber is evacuated therefrom to pass through the hose and the motor of the power unit.

Abstract: A filter bag which, when installed, exhibits an improved seal between the thimble and the bag is provided by (1) encasing the ring member in fabric, (2) by incorporating a fabric sleeve concentric with the cuff of the bag or (3) by incorporating two ring members in the bag cuff.