Abstract: An apparatus is set forth to limit differential pressure during opening of the water faucet, wherein the apparatus includes a housing with a series of spaced parallel diffuser plates mounting a diffuser medium therebetween, wherein the diffuser plates direct fluid flow coaxially of the plates to a surrounding cylindrical channel, and wherein the channel is directed forwardly of a forward solid end plate and through a directional cylinder into an associated water faucet.

Abstract: An internal combustion engine exhaust muffler formed to be dividable and integratable wherein an exhaust gas introducing tube and a pair of supporting pillars positioned substantially parallelly on both sides of the exhaust gas introducing tube are arranged within the exhaust muffler and a tubular member holding a cloth-like catalyst between holding screens is deformed to be substantially elliptically tubular and is hung over the pair of supporting pillars so as to enclose the exhaust gas introducing tube.

Abstract: A sound absorbing muffler for a compressed air driven motor has first and second mutually confronting end walls connected by four side walls. A pad of sound absorbing material constructed from SAE No. F-7 polyester felt is contained in the muffler housing. An entrance port at the center of the first end wall supplies exhaust to the interior volume of the muffler housing. A series of depressions in the first end wall disperse the exhaust over a first planar surface of the pad of sound absorbing material. The porosity of the sound absorbing material permits the exhaust along with grease, oil or water carried by the exhaust to pass through the pad. The exhaust exits a second planar surface of the pad at the second end wall of the muffler housing and is discharged from the interior volume of the muffler housing through a plurality of louvers provided in the second wall of the muffler housing.

Abstract: There is provided a new and useful combined muffler and catalytic converter exhaust unit for the exhaust stream from an internal combustion engine, the combined unit comprising a housing having an inlet and an outlet, first and second chambers within the housing, an oxidation/reduction catalyst within the first chamber, noise muffling means within the second chamber, and wherein the first chamber has an inlet leading to the inlet of the housing and an outlet leading to an inlet of the second chamber, and the second chamber has an outlet leading to the outlet of the housing.

Abstract: A sound absorption device for a blow nozzle formed with a bore extending from a low-pressure side of the nozzle, at which a gas flow enters the nozzle, to a high-pressure side of the nozzle, at which the gas flow streams from the nozzle through a nozzle opening formed at an end of the bore, includes a sound-absorbing insert for muffling noise which results from a variation in density of the gas flow as it streams through the nozzle opening and has frequencies ranging over substantially the entire audible frequency range, the sound-absorbing insert being shaped as a truncated cone and being rigidly set into the bore formed in the blow nozzle, with the smaller face of the truncated cone being disposed directly at the nozzle opening, the sound-absorbing insert being a rigid structure formed of sintered bronze spheres having a power grain-size.

Abstract: A silencer device is installed into the discharge pipe of a centrifugal compressor by first installing a channel shaped frame in the discharge pipe and then sliding the silencer device into the frame to be contained for operational use. The orientation and placement of the frame and its contained silencer device is parallel with the direction of flow to thereby reduce the resulting pressure drop, and it is placed near a turn in the discharge pipe such that the sound will tend to be reflected from the discharge pipe to cause multiple passes through the silencer device and thereby enhance its absorptive performance. The absorptive material within the silencer device is protected from erosion by a surrounding cloth bag composed of a fine weave Nomex material.

Abstract: An exhaust duct part for the outflow of a fluid, in particular for the outflow of the exhaust gases of an internal combustion engine, includes a continuous external casing of substantially constant cross-section and containing at least one acoustic attenuation unit positioned longitudinally in the external casing so as to delimit at least one fluid transfer section of a length determined in such a way that the transfer section participates in the acoustic attenuation function of the exhaust duct part. The attenuation unit includes an internal casing of substantially constant cross-section and, together with the external casing, delimits at least one longitudinal peripheral channel for the passage of the fluid. The internal casing has a circular or elliptical cross-section and includes at least one zone deformed radially in such a way as to increase the surface of exchange between the fluid and the attenuation unit.

Abstract: Sound muffling devices for marine engines for installation on the external portion of the transom of a marine vessel are attached in such a manner that any breakdown within the silencer causes no discharge of exhaust gases or cooling fluids into the interior of the vessel and the gases and cooling fluid continue to be discharged overboard. The silencer is designed to reduce, substantially, the noise level emitted by the engine under operation by the efficient mixture of gases and water through a series of baffles, with low resistance to gas flow that does not diminish engine efficiency. The gases and odors are emitted from the vessel at the centerline with distance and direction such as to reduce, substantially, emissions into the air environment. The device receives exhaust gas and cooling water from an exhaust pipe passing through the transom at the side of the boat and directs the gas athwart the boat to the center where it is exhausted.

Abstract: There is disclosed a silencer for a pneumatic system, including a sound muffler containing a primary filter and removable cartridge containing an oil mist reclassifying filter.

Abstract: This invention provides an improved method and apparatus for attenuating the sound of flowing fluid. The apparatus of this invention includes at least two attenuating areas, preferably particle-filled containers arranged serially within a housing. One of the attenuating areas has a central void into which a portion of the fluid may flow on its way through the muffler. The muffler may also include a mechanism for permitting one of the attenuating devices to move in order to accommodate changes in fluid pressure.

Abstract: A regenerable desiccant cartridge for an automotive muffler including a tubular wire mesh sleeve containing adsorbent and having opposite end portions, an elongated metal base plate extending the entire distance of the sleeve and having end portions crimped over the open ends of the sleeve, the base plate also including rounded corners.

Abstract: An improved design for the central power and suction unit of built-in vacuum cleaning systems, which improved design provides significant acoustic damping to substantially reduce the noise level generated from the central power and suction unit. The design further permits the canister of the central power and suction unit to rest on the floor. The motors of the central power unit are enclosed within an interior chamber which includes at its lower end a baffle supporting an acoustic damper such as acoustic foam and the interior chamber is vented through exhaust ports the tips of the armatures are separated from the remainder of the armatures and motors by the baffle and the tips of the armatures extend into another chamber which further includes a second acoustic damper within the chamber and further includes openings for permitting cooling air to enter the chamber. Through this design, the noise level generated from the motors is very substantially reduced while the motors are sufficiently cooled.

Abstract: A vocal sound muffling device having an elongated tubular body providing an elongated tubular cavity, a mouthpiece on one end of the body providing an inlet into the cavity for vocal sound waves and atomized fluids, a closure on the other end of the body having a fluid outlet therein for regulating fluid flow from the cavity, and cellular material in the cavity intermediate the inlet and outlet for attenuating the vocal sound waves.

Abstract: A heating device, particularly an automotive heating device, in which a noise muffling device is integrated within the heating device. The muffler can be provided in the combustion pipe defining the combustion chamber, or the combustion pipe, itself, can be designed as the muffler. The muffler operates by absorption and/or reflection sound muffling techniques in accordance with various embodiments, and may, simultaneously, purify the combustion gases, for example, by catalytic afterburning, and/or by filtering of soot particles. The muffler is arranged in a hot zone, but not in the flame area of the combustion chamber, to achieve a self-cleaning action. In other embodiments, noise muffling material is arranged in an exhaust gas collection chamber to achieve sound muffling based on reflection and/or absorption and/or other conventional sound reduction methods. In all cases, the need for an external muffler in the exhaust line from the heating device is eliminated.

Abstract: A self-cleaning airflow regulator (100) includes a partially air pervious poppet cylinder (134) disposed between a pair of spaced-apart sidewalls (130, 132) of a restriction chamber (128) to move along the sidewalls in a direction transversely to the length of the poppet cylinder toward and away from an air inlet (136) for directing supply air into the restriction chamber. The restriction chamber includes an air outlet (138) located on the opposite side of the poppet cylinder from a location of the inlet (136). Air entering the restriction chamber (128) through the inlet (136) pushes against the poppet cylinder to force the poppet cylinder to move toward the outlet (138) at the same time causing the poppet cylinder to rotate about its longitudinal axis due to the reactive contact of the poppet cylinder with diagonally disposed fibers (170) mounted on the inside surfaces of the walls (130, 132) of the restriction chamber.

Abstract: The invention is directed to an exhaust gas muffler for a two-cycle engine, especially for a handheld portable tool, such as a chain saw. In exhaust gas mufflers equipped with a catalyzer, the formation of flame from the fuel-containing exhaust gases exiting from the muffler must be prevented. These exhaust gases are intensely overheated because of the exothermal process in the catalyzer. The muffler according to the invention includes a catalyzer which establishes a connection between separate component chambers of the muffler housing. The muffler can be mounted directly on the motor outlet.

Abstract: A braking-power booster including a valve for controlling the pressure that acts upon the booster piston. The valve has two radially spaced valve seats, which both face toward and seal off against a valve sealing plate. With the radially inward valve seat off the valve plate, air passes through the valve. A silencer in the form of a screen is arranged directly alongside the radially inward seat that is opened off the plate. Upon air passing through the valve, the screen suppresses noise generated in the valve. The screen is of a round-wire netting, comprised of brass wire that is galvanized. The screen has a cup-shape, and its convex side faces the seat.

Abstract: A muffler includes a cylindrical body, a gas passage pipe insertedly mounted within the cylindrical body, and a sound absorber mounted upon the gas passage pipe in an encircling manner. Gas is discharged from the gas passage pipe through the cylindrical body and sound absorber. The cylindrical body has a disk-like partitioning wall axially dividing the interior space thereof. The gas passage pipe has an outer flange and a plurality of pawls cooperating with the flange so as to clamp the partitioning wall therebetween.

Abstract: A noise attenuating assembly for use in conjuction with an air conditioning unit having a sloped discharge opening is disclosed. The assembly includes a front wall and a pair of side walls forming a flow path for the conditioned air which is discharged to the space containing the unit. The assembly has a layer of sound attenuating material attached to the inside surface of the walls so that the assembly deflects and absorbs line-of-sight sound produced by the unit fan, thus reducing the noise level of the unit.

Abstract: A muffler construction having improved sound attenuation characteristics. A tapered tubular metal screen is disposed within the outlet conduit of a muffler and has a axis concentric with the axis of the conduit. The screen has a closed end preferably facing in a downstream direction with respect to gas flow, and the opposite open end of the screen is attached to the conduit. The screen acts to reduce the sound levels without increasing the overall size of the muffler and with a minimum increase of weight.

Abstract: The invention relates to an exhaust gas muffler for a two-stroke engine of a portable handheld tool such as a chain saw. The exhaust gas muffler includes a catalyzer wherein high exhaust gas temperatures are developed because of the exothermal reaction which takes place therein. The catalyzer is located in the forward portion of a gas-tight hollow body mounted in the housing of the muffler. The hollow body has a tapered portion which extends out of the housing in the direction of the exhaust gas flow. In this way, the surface temperature of the muffler housing is reduced.

Abstract: The invention is directed to a compact noise abatement muffler for an internal combustion engine. The muffler includes a housing having a plurality of chambers and fluid conductors for enabling the exhaust gases passing through the muffler to achieve at least 4 changes of direction of gas flow. The muffler of the invention is capable of reducing the sound pressure level of the exhaust gases between the input and exhaust ports of the muffler in the range of 10-25 decibels.

Abstract: A sound attenuating muffler for motor vehicle exhaust systems contains a fibrous glass cartridge with a binder-hardened outer shell surrounding a soft fibrous core through which a gas flow tube extends.

Abstract: A silencer device having a substantially aperiodic (non-frequency-dependent) silencing action is provided. The silencer is of the flow type comprising an elongate chamber generally defining or surrounding an unobstructed fluid transmission path. The chamber is principally occupied by fluid having a predetermined characteristic impedance and is provided at both ends with acoustic energy absorbing means for providing acoustic impedance type terminations to said chamber, the acoustic impedance of the terminations being substantially equal to the characteristic impedance of the fluid in the chamber.

Abstract: A noise attenuating tube mounted in an engine compartment air intake hood duct of a motor vehicle to attenuate engine air intake noise in the hood is disclosed.

Abstract: A sound attenuation apparatus which is to be connected to an airflow duct and is to receive the air from the duct. The sound attenuation apparatus includes a mass of plates located in a stacked arrangement with peripheral gaps being formed between the plates. The airstream is to be conducted through an opening formed between the plates. The airstream is to be conducted into an opening formed within the center of the plates and then discharged into the ambient through the peripheral gap area. Each of the plates include a mass of holes.

Abstract: A sound attenuator may be directly threadedly connected to the exhaust port of a pneumatic device whose exhaust air is to be attenuated. A fail safe blowout plug is provided in the attenuator at the end remote from the exhaust port connection. A cartridge screen covering exhaust slots in the attenuator wall is trapped within an annular groove in the end of the attenuator remote from the exhaust port connection. The screen overlies a protective cover within the attenuator which extends over the blowout plug.

Abstract: Low frequency noise and turbulence are reduced in a damper structure by providing a perforate screen extension onto the damper blade so as to extend across the flow path when the damper is open. Additionally, a perforate screen is located immediately downstream of the damper and spaced from the wall so as to define a chamber therewith as well as defining a boundary of the flow path.

Abstract: A muffler device for use in a brake booster system in which there are inserted in an air suction passage cylindrical noise shielding member having at one end an outer flanged portion extending radially outwardly and at the other end an inner flanged portion extending radially inwardly, the circumferential wall of the noise shielding means being defined with an air suction opening; and cylindrical noise absorbing member with a gas permeability being inserted into the inner circumference of the circumferential wall, in such a manner that noises as generated at the valve mechanism during the operation of the brake booster may effectively be prevented from propagating to the outside by aid of the noise shielding member and the noise absorbing member together.

Abstract: A particulate trap exhaust muffler for use with a diesel engine and comprising a casing having an internal wall dividing the casing into an inlet chamber and an outlet chamber. The wall is formed with a plurality of openings and a plurality of generally parallel tubes are disposed within the outlet chamber with one end of each tube being mounted within one of the openings in the divider wall, while the other end of each tube is closed. At least a portion of the length of each tube is formed with perforations or holes. A cylindrical particulate trap is spaced concentrically outward of each tube to provide an annular chamber therebetween. Exhaust gas entering the inlet chamber flows into the tubes and through the perforations into the respective annular chambers to decrease the sound energy, and then passes outwardly through the cylindrical traps where particulate material is trapped and burned off. The exhaust gas then is discharged from the outlet chamber through an outlet.

Abstract: A method of preventing access to the interior of the exhaust system of a vehicle by irreversibly installing on the tailpipe of the vehicle a tailpipe guard in the form of a heavy gauge steel tube having at one end an internal diameter which will accept the tailpipe with a relatively close fit, and having at the other end a heavy steel grating over the exhaust opening.

Abstract: A catalytic converter has a gas pervious catalyst support member extending across a housing and dividing the housing into an upper chamber and a lower chamber. The catalyst support member has two parallel spaced apart upper and lower foraminous sheets which undulate across the width of the container and each having a single peak and a single trough to form a catalyst containing chamber between the two sheets having a generally sinusoidal-type wave configuration when viewed in cross-section along a plane perpendicular to the length of the housing. A bed of catalyst particles substantially fills the catalyst containing chamber. A gas inlet at one end of the housing is positioned to cause gases to enter into one of the upper and lower chambers and pass through the catalyst support member and the catalyst containing chamber to the other of the upper and lower chambers, with a gas outlet at an opposite end of the housing being positioned to cause the gases to leave from the other chamber.

Abstract: An exhaust silencer has an inlet opening and an outlet opening spaced axially from the inlet opening and includes a cylindrical shell. A core inside the shell defines at least one axial passage and has at least one helical baffle defining a helical flow passage around the axial flow passage within the shell. The axial flow passage has a barrier at its downstream end and has an upstream opening aligned with the silencer inlet opening. It also has an outlet axially spaced from the axial passage inlet opening, the said outlet being directed transversely outwardly into the downstream half of the helical flow passage, at a region upstream from the barrier.

Abstract: An intake silencer comprising a cup-shaped body made of elastic material to cover an air inlet of carburetor chamber of an internal combustion engine. A plurality of intake passages are provided to pass through side walls of the body. A circumferential groove is formed along an edge of an opening portion of the body. An air filter element is received along its edge by the circumferential groove.

Abstract: A sound damping device for suppressing the noise generated by a gas stream emitted by a blow-off valve includes a body of a porous, resiliently readily compressible material traversed by the gas stream and a nipple projecting into the body and having a passage oriented coaxially with the axis of the body. The passage has an inlet opening adapted to receive the gas stream from the valve and a sound suppressing outlet being spaced from the inlet opening and being situated within the body. There is further provided a deformable outer layer which substantially entirely surrounds the body and is bonded thereto. The outer layer, similarly to the body, is permeable to air.

Abstract: Exhaust device wherein the exhaust gas from the engine is not directly exhausted to the ambient air. The free end of the exhaust pipe is closed and openings are arranged in the mantle of the pipe in the area of the free end. The openings are directed to the road side. Openings are also provided in the exhaust pipe within the housing of the exhaust device. Additional filters are mounted in the container to purify the exhaust gas. The container is provided with an inner wall or coating along the mantle surface to improve sound damping. The simple construction of the proposed exhaust device makes its manufacture inexpensive. Furthermore, its contribution to the protection of the environment is considerable.

Abstract: A muffler for an internal combustion engine for effectively damping noise over a wide frequency range, from low frequency noise to high frequency noise. An absorber packed type muffler adapted to absorb noise by a sound absorbing material is inserted in and fixed to a housing which has a bore or bores thereinside, thereby forming one of a pipe inserted type muffler, a resonance type muffler and an interference type muffler to attain combined characteristics of both the types of mufflers.

Abstract: A muffler for dissipating the sound component in exhaust gases from an internal combustion engine or the like is disclosed which has an enhanced useful life. The muffler includes a partition positioned across an incoming stream of exhaust gases. The partition is formed with stream dividing or splitting means which positively divides the stream into portions that can be more evenly directed throughout the muffler. This prevents destructive preferential flow of gases within the muffler. Additionally, shielding of sound absorption material in the muffler is accomplished by selecting the pattern of perforations to reduce the contact of such material with high velocity gases.

Abstract: An exhaust duct connector takes the form of a Y-shaped passage. Both of the branches of the Y are adapted to receive ends of upstream exhaust ducts and a leg of the Y is adapted to receive one end of a downstream exhaust duct. A substantially plate-like partition is positioned at the junction of the Y parallel to the single leg. The partition includes a plurality of holes through which exhaust can pass. The partition may include an outer partition member having a plurality of holes and an inner partition having numerous extremely small holes covered by the outer partition member. The partition may contact the adjacent inside wall of the Y-shaped passage, or be spaced from the adjacent inside wall of the Y-shaped passage. The partition may take the form of an airfoil.

Abstract: An improved exhaust system (24) uses the entire length of the system in which to perform the essential functions of muffling noise and converting unburned hydrocarbons. The improved exhaust system (24) performs these functions with a relatively uniform minimum diameter along its length. The exhaust system (24) includes a uniform outer diameter pipe (26) and elements (44) of porous material (46) forming a plurality of filters (50) through which the exhaust gas flows and which attenuates sonic frequency sound waves in the exhaust. The elements (44) are preferably elongate strips which may be folded into rectangular filters (60) or elliptical filters (90). The rectangular filters can be folded sufficiently to form squares and the elliptical filters to form circles. The rectangular filters define passageways (62-68) between the edges of the filters and inner wall (70) of the pipe (26) which further attenuates exhaust noise through imbalances in the gas flow.

Abstract: A relatively small, lightweight muffler is provided, especially adapted to low horsepower aircraft and comprises an elongated, essentially cylindrical structure made up of inner and outer casings having sound-absorbent-material-containing chambers and pressure-wave trap elements to minimize exhaust noises. The rear end of the muffler is in the form of a cone having its apex to the rear and containing a quantity of sound-absorbent material in a rearward part thereof and the conical wall ahead of this material being perforated. One form of the structure has a convex or hemispherical front end for aerodynamic purposes in those cases where the muffler is installed externally of the aircraft. The pressure-wave traps comprise walled structures having louvered slots therein appropriately aimed to direct the pressure waves to the sound-absorbent material.

Abstract: A breathing air garment for isolating a wearer from hostile environments containing toxins or irritants includes a suit and a separate head protective enclosure or hood engaging a suit collar in sealing attachment. The hood and suit collar are cylindrically shaped and dimensioned to enable the wearer to withdraw his hands from the suit sleeves to perform manual tasks within the hood interior. Breathing air is supplied from an external air line with an air delivery hose attached to the hood interior. The hose feeds air into an annular halo-like fiber-filled plenum having spaced discharge orifices attached to the hood top wall. A plurality of air exhaust/check valves located at the suit extremities cooperate with the hood air delivery system to provide a cooling flow of circulating air from the hood throughout the suit interior. A suit entry seal provided on the suit rear torso panel permits access into the suit and is sealed with an adhesive sealing flap.

Abstract: A muffler for an internal combustion engine comprises an air inlet passage in a casing of said muffler in a hollow surrounded by an inner wall of said casing and an outer wall of a porous sound absorber which is held in said casing.

Abstract: Disclosed herein is a silencer constituted by a casing, open at the lower extremity made to communicate with the source of compressed gases, and closed at the top by a cover, inside which are placed, from the bottom upwards, a first element, a filter and a second element which, jointly with the inner surface of the casing, define a first, a second and a third expansion chamber, respectively, for the compressed gases.The first expansion chamber communicates with the open extremity of the casing, the second contains the aforementioned filter, while the third, via a slit made in the cover, communicates with the outside. The first and second expansion chamber are inter-communicating because of through holes drilled in the first element, and likewise the second and third expansion chamber are inter-communicating because of through holes drilled in the second element.

Abstract: A supplied air respirator having a detachable air flow baffle therein, the baffle having increased air flow efficiency with a low noise operating level. The baffle is formed from a flexible plastic tubing having openings spaced laterally and circumferentially therein and having a foam layer sealingly secured there around and preferably having a cover thereover. The baffle can be formed in a partial or substantially complete loop within the respirator and is detachably secured therein with clips or loops.

Abstract: The invention relates to an exhaust muffler made of enamelled sheet steel, which is composed of a plurality of structural parts in which the structural parts of the muffler are coated with enamel slick, are then put together and heated to enamelling temperature, with the contacting surfaces of the structural parts thus fusing and in that way being securely connected together. Such structural parts include two head pieces provided with connection pipes which are positioned on the exhaust muffler sheath, as well as sound absorbing elements disposed inside the muffler. The head pieces and the sound absorbing elements arranged on the inside of the sheath, are connected with the sheath by means of connection surfaces located on the peripheral edges of the head pieces and the sound absorbing elements which are bent over parallel to the wall of the sheath. Between these various surfaces enamel slick is applied, whereby these members are connected together upon firing.

Abstract: An exhaust system for a vehicle includes an afterburner in communication with the exhaust manifold of the engine on the inlet side of the afterburner. The outlet port of the afterburner communicates with a muffler of unique construction which, in turn, communicates with a resonator. The system thereof provides reduced particulate solids in the exhaust fumes.

Abstract: A combination acoustical muffler and exhaust converter for use with internal combustion engines, comprising an elongated hollow cylinder adapted to be connected to a source of exhaust gas, screen means positioned at a plurality of longitudinally spaced locations within said cylinder for partitioning the cylinder into a plurality of chambers arranged in series flow relation with each other and with respect to the flow of exhaust gas through said cylinder, the screens having a silencing action on said exhaust gas, magnet means in one of said chambers for exerting a magnetic pressure on the gas passing therethrough to serve to separate ferrous particles from the exhaust gas stream, a packing material of mineral material, such as mineral wool, in another of said chambers for condensing moisture in said exhaust gas and for removing hydrocarbon therefrom, and a material such as a ceramic material of an extremely fine porous nature, in still another of said chambers for removing carbon monoxide from said exhaust gas

Abstract: An improved muffler is provided for attenuating noise generated by a pressurized fluid when released to the atmosphere. Use of a combination fill-pack and void volume gas collector herein permits effective operation with a much smaller unit than normally required.

Abstract: A power tool, especially power saw, having a two-stroke internal combustion engine, that is provided with a substantially horizontally arranged cylinder, a cooling air blower, with guide surfaces directed towards the belonging therewith and arranged on one side of the cylinder, and a muffler connected to the cylinder outlet. The muffler has an exhaust gas inlet conduit which is in communication with an expansion chamber of the muffler. At least part of the walls of the muffler which are subjected to exhaust gas emanating from the cylinder chamber belonging therewith are arranged, when viewed in the direction of flow of cooling air, before the cylinder of the motor and are adapted to present guide surfaces for a stream of cooling air.