Abstract: A vacuum cleaner is provided with a subassembly including an electric motor, a fan driven by the motor and a housing which supports the fan and motor. This assembly is supported on the upper surface of the lid of the dirt collecting drum, with the fan housing being clamped between a motor housing and the lid. First and second thin ring-shaped gaskets mounted in face-to-face relationship are cemented to the fan housing and lid, respectively. A lightly compressed third relatively thick ring-shaped gasket is interposed between the motor housing and fan housing. This three gasket combination serves to effectively isolate the lid and motor housing, as well as other elements of the vacuum cleaner from motor and fan vibrations.

Abstract: An elongated hollow plastic body mounts a first plastic exhaust pipe of L-shaped configuration which passes completely through the body. Its inlet end is connected to the positive air pressure discharge of one vacuum pump connected to a closed dirty water vacuum dump tank for the hot water vacuum extraction machine. A second plastic L-shaped exhaust pipe is reversely oriented within the hollow body and has a plugged end abutting the side of first pipe near its inlet to the body. Both pipes are perforated within portions internal of the body and the hollow body is filled with glass wool to muffle the sound. The second pipe at its inlet end, is connected to the positive pressure air discharging from a second vacuum pump also connected to the vacuum dump tank.

Abstract: An upright type electric cleaner including a main body case (1) and a suction port body (1), wherein when the main body case is brought to an upright position as the machine is inoperative, a rotary brush extending downwardly from the bottom of the suction port body (1) is released from contact with the surface to be cleaned. The suction port body includes a single switching knob which, when manipulated, enables the speed of operation of the rotary brush and the distance between the rotary brush and the surface to be cleaned to be adjusted simultaneously. A part of exhaust air of the cleaner released through a blower is led through a sound absorbing duct located in a bag compartment into a cord reel chamber to thereby greatly reduce the noise level of exhaust and preventing cord overheating of a power cord of the cleaner.

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 noise muffler for a vacuum cleaner is constructed of flexible open cell foam inserts, one of which extends across an opening through which working air flows between two plenums. At this opening the foam insert is provided with a plurality of relatively large perforations. Similar perforations may be provided at the ends of the other insert, this other insert being in the downstream plenum.

Abstract: A noise suppressor for vacuum cleaners is characterized by a muffler formed of a succession of tubes of different cross sectional areas and lengths. The muffler defines a low pass acoustic filter, and is connected in line with an exhaust outlet from the vacuum cleaner. Preferably, the muffler is used in place of a sleeve conventionally found in a filter bag for the vacuum cleaner, and thereby acts as a stand pipe to maintain the inlet to the filter bag above collected debris so that the inlet is not choked off with debris before the bag is filled.

Abstract: An arrangement for cleaning band-shaped data carriers, such as photographic film, has at least one brush element arranged to move relative to a data carrier so as to remove dust particles from the latter, an aspirating element for aspirating the thus removed particles, a high-frequency electric motor driving the aspirating means and having a frequency which is a multiple of the frequency of an electric network, and a frequency amplifier arranged to connect the electric motor with the electric network.

Abstract: A unitary tubular exhaust duct directs exhaust air from a scroll type outlet for a vacuum pump mounted within a hot water vacuum extraction machine into a baffled exhaust expansion chamber. Noise reduction is accomplished by mixing the exhaust air with the motor cooling air aspirated into the expansion chamber by an exhaust duct branch terminating at its end remote from the exhaust expansion chamber in a cylindrical shroud which surrounds the vacuum pump electrical drive motor casing and the area of the cooling air exhaust holes within that motor casing.

Abstract: A vacuum cleaner with a housing having a hood and at least one suction connection and at least one discharge opening, as well as with a dust filter and a suction apparatus provided with a blower and an electric motor, with the suction apparatus being surrounded by the hood. A noise damping or insulating device is arranged between the inner surface of the hood and the suction apparatus. The noise damping device has a damping sleeve surrounding the suction apparatus in the manner of a mantle.

Abstract: The disclosure concerns a compact wet-dry vacuum cleaner adapted for collecting both wet and dry materials. The vacuum cleaner is powered by a by-pass type blow motor which is supported in a housing. The housing includes a baffle for separating the inflowing cooling air to the motor from the outflowing air which has cooled the motor. The placement of inlets and outlets to the motor housing prevents debris and liquid from splashing on the motor. A materials collection tank is separably attached to the motor housing to enable the tank to be removed for cleaning. The tank includes a nozzle at its front wall, which nozzle has an exit near the top of the tank. A curved air flow redirector at the top of the tank separates collected material from the air. The outlet from the tank is laterally spaced from the flow redirector. The motor housing is attached to a swivelable cover that extends over the motor. The cover extends over a duct that communicates between the materials collection tank and the blow motor.

Abstract: The disclosure concerns a housing for reducing the noise and exhaust air velocity of a bypass type blower motor, particularly a motor used for a tank type vacuum cleaner. The entire housing sits atop the lid of the tank of the vacuum cleaner. The bypass type blower motor has a main, suction generating, centrifugal blower fan and a separate motor cooling fan. Outlet from the main blower fan is into a first expansion chamber above the lid. A spiral pathway baffle in the first expansion chamber defines a gradually increasing cross-section plenum which communicates from the fan to the outlet from the first expansion chamber. There is a tubular outlet from the first expansion chamber which is surrounded by a sound baffling cuff of foamed plastic material. A cooling air inlet to the motor cooling fan and a separate cooling air outlet from the casing for the motor cooling fan are provided.

Abstract: A noise abating enclosure is positioned beneath and movable with the overhead-mounted blower fan housing of a traveling pneumatic cleaner, and is provided with an upwardly opening air flow inlet passage in a medial portion thereof which communicates with the inlet opening in the fan housing. The enclosure also is provided with one or more stacks projecting upwardly from outer portions thereof and adjacent the fan housing so that air flows downwardly from generally above the traveling cleaner and into the stacks at locations spaced from the machines and operators below the fan housing of the traveling pneumatic cleaner so that impingement of noise generated by the air streams onto operators is minimized.

Abstract: A hand vacuum cleaner includes a housing having an inlet and an outlet, and a front and a rear part connectable with each other so as to constitute the housing. The housing has a front face and a rear face spaced from the inlet in the flow direction of incoming contaminated air entering the housing. A dust filter is located in the housing at the rear face thereof. A blower is located in the housing for aspirating the contaminated air into the housing through the inlet and into the dust filter and for urging the filtered air therefrom in a second direction towards the outlet. An intermediate plate is provided in the interior of the housing, which has a first formation constituting a first passage for the incoming contaminated air, a second formation constituting a second passage for guiding the filtered air from the dust filter towards the outlet and a third formation for fixing thereon the blower.

Abstract: The disclosure concerns a sound dome which is positioned over the motor housing of a bypass type vacuum cleaner. The main housing outlet for the main blower fan of the vacuum cleaner opens under the sound dome. The dome outlet from the sound dome is spaced away from the main housing outlet, causing the air from the main housing outlet to be redirected to the dome outlet. The motor housing has a tower portion that extends up into the sound dome. The housing has a cooling air inlet for cooling air to the motor, which is located higher up on the tower, and has a cooling air outlet for air that has cooled the motor, which is located lower on the tower. A baffle in the sound dome separates the cooling air inlet and the cooling air outlet. The enlarged plenum defined by the sound dome and the indirect pathway between the main housing outlet and the exit from the sound dome tend to reduce the noise generated by the vacuum cleaner.

Abstract: A noise suppressor package attachable to air exhaust tubing comprises:A. annular body means defining an axially extending bore to pass said exhaust, said body means including compressible foam segments which project radially inwardly at said bore, said segments being axially elongated and circularly spaced, andB. a tubular cover extending about said body means and having a flexible neck at one end of said body means, said neck being radially constrictable about said exhaust tubing to retain the package to the tubing.

Abstract: A jet nozzle is described in which the noise is greatly reduced. It comprises a tapering thick-walled tube of rubber or plastic, to the wider end of which a pressurized fluid is supplied through a porous filter body retained by a cup-shaped bowl having a perforated bottom.

Abstract: The present invention relates to a pressurized air-driven suction device for dust, mud, liquids, and similar substances, comprising one or more nozzles for ejecting pressurized air, and including appurtenant venturi tubes situated in an elongated tubular ejector housing, which at its outer end, if desired, may be provided with a silencer. A suction air pipe for supplying suction air is also mounted in said ejector housing, which is itself mounted through the end plate of a container, such as an oil drum having plug holes.