Abstract: A sterile air recycling module is mounted to a wall of a room and includes a housing having an outlet for discharging sterile or clean air into the room, opposed grilled inlets for controlling the volume of air drawn into the interior of the housing from the room, and an inlet for fresh air or plant conditioned air, a supply pressure plenum chamber within the housing for discharging air through a high efficiency particulate air (HEPA) filter which is in fluid communication with the housing outlet, and a blower within the housing for withdrawing air from a negative pressure plenum within the housing and an outlet in fluid communication with the supply pressure plenum, the housing inlets being in fluid communication with the negative pressure plenum.

Abstract: A treating facility for treating sintering waste gas comprises a first electric dust collector receiving the waste gas and a main blower connected to the first dust collector for moving the waste gas through the first dust collector. A heat exchanger is coupled to receive the waste gas from the blower. A waste gas purifying device is coupled to the heat exchanger for purifying the waste gas discharged from the first dust collector. A second wet electric dust collector is coupled to receive the waste gas from the purifying device and a pressure riser is coupled to the second dust collector for raising the pressure of the output gas of the second dust collector. The output gas from the pressure riser is returned to the heat exchanger and after heat exchange with the gas discharged from the blower is exhausted to atmosphere.

Abstract: A floor care appliance is described in which a rigid housing may extend upwardly from the appliance nozzle. The rigid housing may mount a reel therein or may just serve as an appearance housing for the floor care appliance. In either case, the rear of the housing mounts a rigid plate that extends upwardly from it. An upper fill tube has its upper end attached to this plate. The cloth bag for the floor care appliance extends around the fill tube and is mounted to the housing, intermediate its upper and lower ends, by the rigid plate. The cloth bag thereby encapsulates the rigid plate and fill tube so as to provide a pleasing outside appearance to the floor care appliance.

Abstract: A filter assembly for a clean room and a total clean room assembly incorporating the filter assembly wherein the filter assembly includes a filter housing for receiving a suitable filter unit. The filter design of the filter assembly produces a seal between the filter housing and the upper and lower edges of the filter unit to prevent unfiltered air from leaking around the filter housing into the clean room. The filter assembly is also designed to be positively clamped and sealed to a supporting framework, or lattice, in order to provide a totally sealed air delivery system for a clean room.

Abstract: A self-acting device for filtering the smoke commonly associated with cigarettes and cigars includes an ashtray which supports a shroud for confining smoke. The shroud in turn supports a motorized fan which creates a flow of air to carry the smoke. In close proximity to the fan and also supported by the shroud is a detector which acts to sequentially sense the smoke and activate the fan motor. A portion of the detector also serves to separate a certain amount of the smoke from the air. Smoke which remains is further drawn upwards by the suction forces created by the fan through a filter before the filtered air is ultimately propelled into the immediately surrounding environment.

Abstract: There is provided a filter wherein the filtering means has a non-woven needled textile filter fabric with an overall bulk density of at least 6 pounds per cubic foot and bulk density gradient such that the bulk density at the face surface of the fabric is greater than the bulk density at the back surface of the fabric. In conjunction with that bulk density gradient is a filtering gradient such that the fineness of filtration at the face surface is greater than the fineness of filtration at the back surface. The filter may be in any convenient form, such as the bag of an air conveyor filter or a vacuum cleaner filter.

Abstract: An aerator for use in the neck of a flask for increasing the flow of gas from the exterior to the interior of the flask. The aerator has a gas-impervious exterior wall a plurality of gas moving members are positioned within the wall and tend to urge gas through the aerator.

Abstract: A device for cleaning the air in welding shops includes a casing surrounding a fan and an electric motor, a mechanical filter upstream of the fan and a filter including active carbon down-stream of the motor. In order to maintain a suitable temperature for the active carbon the air is brought to pass through, or around the motor. A thermal relay is provided to interrupt the current supply to the motor, should the temperature, due to clogging of the mechanical filter and resulting increase of the motor output, be raise to an impermissible level.

Abstract: A vacuum cleaner dust bag that is constructed to substantially increase the filtering action of the bag and therefore is particularly adaptable for use in vacuum cleaners utilized in hospitals, nursing homes, and other health care facilities. The filter dust bag is constituted of two concentric sections or compartments with the space of one of the compartments having a dry filter mat material that effectively traps all dust and dirt particles down to minute particles of about 0.3 microns. The tube on the filter dust bag which connects to the discharge outlet of the vacuum cleaner is constructed of an air-impervious material, while the outer and inner layers of the filter are fabricated of air-pervious material of different elasticity.

Abstract: An apparatus supplies to a selected region air laden with a vapor which may be a scent or a masking odor. The device may be controlled to hold the level of vapor in the selected region at a desired value. Provision is made for prevention of the loss of the compound to be volatilized when the device is not in use as well as when in use.

Abstract: A total exhaust laminar flow biological fume hood safety cabinet is disclosed having a closed housing with a viewing panel and access port therebeneath at its front portion. Centrally a work tray is mounted with means permitting air passage thereabout. A plenum chamber connects the lower portion of the housing to the top, and an exhaust blower in closed pneumatic communication with the plenum delivers contaminated air to an exhaust filter for total exhaust. Makeup air means are provided at the upper portion of the housing to deliver filtered air downwardly over the work tray, and the blower capacities, flow rates, and filter capacities are developed to the end that the air passing through the access port exceeds the quantity of filtered makeup air while providing for an access air velocity at least double that of the makeup air velocity.

Abstract: A filter bag assembly for a vacuum cleaner is disclosed. The assembly includes an elongated, relatively rigid, hollow tube coupled at one end to the exhaust of a vacuum cleaner. The tube runs upwardly along the handle of the vacuum cleaner and is attached at its other end to a porous filter bag. The filter bag runs downwardly along the rigid tube and has an open end closed by a nonporous dirt-collecting bag. The tube, the porous bag, and the nonporous bag are encased in an envelope so that the nonporous bag is held in a collapsed or stored condition at the end of the filter bag during normal use of the cleaner. To empty the filter bag of its collected dirt, the envelope is opened to expose the nonporous bag and to permit the dirt in the filter bag to drop downwardly into the nonporous bag. The vacuum cleaner may be turned on and off a number of times to distend the bag and dislodge dirt from the filter bag during the emptying operation.

Abstract: A collector of dental scrapings and dust for use by a dental technician. The collector consists of a main housing which is provided with a dust inlet at the lower portion of its front side and which has an open rear side normally closed by a filtering cover provided with a plurality of vent holes and on which is secured an air-permeable foamed plastic sheet for dust collection. A partition wall is provided in said main housing to divide the interior thereof into a suction portion leading from the inlet and an exhaust portion leading to the filtering cover. An electric blower is provided between said suction portion and said exhaust portion to cause air flow from said suction portion to said exhaust portion. The suction portion is provided with a forwardly concave first, relatively short, metal grating of suitable mesh size which is coextensive in width with the inlet and whose length is approximately 1.

Abstract: A mobile air filtering apparatus for hospital rooms, comprises a housing having an inlet and an outlet. A pre-filter is located at the inlet and a fan for directing air in succession through a heater, a diffusion foil moistener and a mechanical filter. The diffusion foil moistener is located between the heater and the mechanical filter and it includes a heat exchange conduit for conducting the water to the moistener which is coiled around the filter. The filter housing is mounted on a fork-shaped arm which is carried on a stand in an adjustable position and the stand is moved around with its associated carriage filter.

Abstract: A device for filtering the smoke commonly associated with cigarettes and cigars includes an ashtray which supports a shroud for confining the smoke. The shroud in turn supports a motorized fan which creates a flow of air to carry the smoke through a filter. A motor for driving the fan is removed from the flow of air to prevent contamination of the motor by the smoke fumes. An elongated filter and a cylindrical filter are both provided with cartridge configurations to facilitate the removal and replacement of the filters. An absorbent material is impregnated with a perfume to enhance the fragrance of the flow of air through the device.

Abstract: A smog control device for use particularly on automobiles and comprising an enclosure connectable to the automotive exhaust system and having a passageway therein defined principally by baffles, and a pair of different sized vaned rotors coaxially mounted on a single shaft are disposed in the passageway such that the first smaller rotor is upstream from the second, larger rotor, whereby the first rotor is driven by the automotive exhaust flow and the second rotor is driven by the first rotor to create a partial vacuum in the passageway between the rotors, the partial vacuum being instrumental in causing the precipitation and caking of exhaust pollutants on downstream baffles which are removable for cleaning. A small motor could also be used to drive the rotors.

Abstract: A pollution control device having a tank provided with an inlet and an outlet arranged for passing a gaseous medium to be cleaned into the tank and through a bath of washing solution held in the tank. A blower unit, mounted outside of the tank, forces the gaseous medium through the bath. A line connecting the blower unit to the bath passes a quantity of washing solution through the blower unit for cooling the unit. Baffles are arranged partially immersed in the bath in the tank for creating a large surface across the gaseous flow and facilitating separation of particulate matter from the medium being cleaned. The baffles are advantageously in the form of a plurality of cylinders each constructed from a mesh material and tiered in one or more substantially vertical channels arranged within the tank.

Abstract: The compressor, as evidenced in the several embodiments presented herein, comprises, in its essentials, a self-contained gear housing which, centrally thereof, receives a power input shaft for driving a bull gear. The bull gear drives either one or a plurality of other gears which, in turn, are coupled to one or a complementary plurality of gas compressing impellers. Integral with the outer wall of one side of the gear housing is defined one or a same plurality of gas handling structures within which the impeller(s) are confined. The gas handling structures comprise inlet pipes, compression chambers, diffusers and open-ended plenum chambers. According to the requirements of the user, domed enclosures are replaceably bolted to the gas handling structure either directly, or through intervening inter- or after-cooler heat exchangers, and with inter-stage ducting, to define of the gas compressor either a single compressing stage, a plurality of independent stages, or successive, series-coupled compressing stages.

Abstract: A compressor, particularly a cooling-medium compressor of a vehicle climate-control arrangement, has an exhaust outlet. An oil separator is connected to the exhaust outlet and comprises a cylindrical coagulator formed of a plurality of layers of wire fabric, and end plates closing off the opposite ends of the cylindrical coagulator, with one of the end plates being provided with an inlet opening for the inflow of a gas-oil mixture from the compressor exhaust outlet into the oil separator.

Abstract: A high efficiency air filter system of the type used in clean rooms and the like, and having a sliding plate valve associated with each filter. The sliding plate valve is positioned on the downstream side of each filter, and includes a highly viscous, non-evaporating fluid positioned between the plates to thereby prevent the air from flowing laterally between the plates, whereby the volume of air flow may be accurately controlled over the full area of the clean room as well as the full area of each filter.

Abstract: This invention relates to bag filter installations, and more particularly relates to a bag filter housing having a number of compartments each including a multiplicity of filter bags. Each compartment includes an offtake duct with a hose coupling on it and a valve by which the duct may be selectively connected to the upstream side of the fan whereby the suction from the latter is utilisable for cleaning the compartment through the hose coupling.

Abstract: An air filtering and distribution structure for an environmentally controlled enclosure, such as clean room, has a first planar surface having a mixed array of filter panels and blank panels spaced from a surface of the enclosure defining a dirty air plenum therebetween, and a second planar section of perforated air diffusing panels spaced from the first planar panel defining a clean air plenum therebetween.

Abstract: The improved dust bag is designed for use with an upright vacuum cleaner and is made of air impervious material. The lower end of the dust bag is connected with the base of the upright vacuum cleaner adjacent to the air discharge outlet of the vacuum cleaner. A first, relatively large opening is formed in the dust bag and defines the flow path through which air may flow out of the dust bag. An inner wall divides the interior of the dust bag into first and second compartments and includes a second opening which is aligned with and coincides, in size and shape, with the first opening and which permits air to flow from the second compartment to the first compartment. A filter is disposed in the first compartment adjacent to the first opening and is utilized to filter the air as it flows out of the dust bag through the first opening.

Abstract: An ash tray unit, containing on the top a removable ash tray with side vents, an electric fan in the middle, an easy to change smoke filter below. The smoke which is produced by cigarettes or cigars placed on the ash tray is drawn through inlet vents and purified in the smoke filter. Improved air is forced out of unit. The ash tray with smoke filter is ideal for offices, hospitals, appartments, automobiles, busses, airplanes and generally for enclosed areas with smoker-non smoker relations.

Abstract: A device for supplying a germ-free air flow over an operating table, comprising a cabinet with a blower-filter unit and outflow openings near the free extremity and below the lateral sides of an operating table, which openings are provided in a U-shaped tube to be connected to this table, the connection between said tube and said unit being formed by a movable tube connection allowing an adaptation to various table heights and dimensions. This tube assembly can be swung upwards and covered by curtains for disinfection in a disinfectant vapor circulated by said unit and through an additional filter or by an additional blower-filter unit.

Abstract: A workspace, within a building where a process is practiced by which airborne liquid particulate grease is generated, is ventilated by an apparatus and in accordance with a method by which air is induced to flow at conveying velocity from the workspace into an unrestricted hood and through an unrestricted duct to a location remote from the workspace, entraining airborne liquid particulate grease with the air and thereby unrestrictedly conveying entrained grease from the workspace to the remote location. At the remote location, the flowing air and conveyed grease is directed into a collection chamber and there guided along an at least partially circular, sharply turning flow path while first accelerating and then decelerating the velocity of flow thereby separating the conveyed grease from the flowing air. The separated grease is retained in the collection chamber while the flowing air which conveyed the grease to the chamber is passed to the ambient atmosphere.

Abstract: A down-flow chamber in which, from a filter in the ceiling of a working room, a germfree and dustfree flow of air is directed downwardly to a working face that is surrounded by walls with exhaust openings for the flow of air at the edges and in which, at the front, a transparent wall is mounted. Between the lower edge of the transparent wall and an exhaust grid in front of the working face there is a vertical opening of such a height that arms can be put through the opening to be able to carry out operations in the working room, wherein at the lower edge of the transparent wall a flexible lid preferably of smooth plastics material is mounted that is hanging down and is substantially extending to the exhaust grid. Further, a device is provided on the chamber that prevents the lid from moving outwardly from the vertical plane through the opening.

Abstract: A portable apparatus for directing a filtered stream of air downwardly over a predetermined area such as a hospital bed or the like. The apparatus includes a cantilevered plenum chamber adapted to be positioned horizontally over the bed, the plenum chamber comprising two segments hingedly interconnected so that the forward segment thereof may be dropped downwardly to facilitate movement and storage. The bottom wall of the plenum chamber comprises an openwork screen bounded by a peripheral slot, and a layer of filtering media overlies the screen such that a first portion of the air entering the plenum chamber is directed downwardly through the filtering media and screen at a relatively low velocity and in a substantially laminar flow pattern, and a second portion of the air is directed through the open slot to define a peripheral air curtain of relatively high velocity. The air curtain thereby serves to prevent the incursion of unfiltered air from the surrounding environment.

Abstract: A rotary compressor assembly constructed to prevent leakage from the compressor housing to atmosphere through the interface between the cylindrical section and the covers of the housing.The compressor is disposed substantially within the tank which receives the compressor discharge and is connected to the wall of the tank. A seal between the compressor and the tank wall seals the tank and thereby prevents leakage from the compressor to atmosphere.