Abstract: A suction noise muffler for a hermetic compressor which is capable of enabling a smooth flow of a refrigerant gas and reducing a suction noise by forming a predetermined shaped refrigerant gas flow guide path and a plurality of noise reducing sections, which includes an upper casing having a rectangular outer wall and a plurality of inner walls arranged within the outer wall, and a lower casing whereby the upper casing is inserted into the lower casing, for thus forming a refrigerant gas flowing path and a plurality of noise reducing sections thereby when assembling the upper casing and lower casing.

Abstract: A catalytic converter for stand-alone application or for use with a novel silencer. The silencer includes a catalytic converter formed from a central housing of a size to house at least one catalytic converter element, an inlet portion connected to the inlet side of the central housing and an outlet portion connected to the outlet side of the central housing. The silencer is formed from a cylindrical housing which is secured on one end to the catalytic converter and on the opposite end to an exhaust pipe of an internal combustion engine. The cylindrical housing has at least one baffle plate transversely mounted therein. The baffle plate has a plurality of perforated conical members positioned opposite each other on each side of the baffle plate. The perforated conical members redirect the flow of exhaust gas through the silencer.

Abstract: An exhaust muffler includes a housing having a rectangularly shaped interior without fiberglass or other packing, an inlet tube on a first end portion of the housing for conveying exhaust gases to the interior, an outlet tube on an opposite second end portion of the housing for conveying the exhaust gases from the interior, and a baffle assembly within the interior for defining multiple different paths for exhaust gases to follow and two Helmholtz chambers for the exhaust gases to encounter as the exhaust gases flow through the interior of the housing from the inlet tube to the outlet tube. A central chamber flow path is provided that inhibits reverse flow.

Abstract: A reciprocating compressor includes a cylinder block disposed in a chamber formed by a casing. A piston is mounted for reciprocation in a bore of the cylinder block. A valved cylinder head is disposed at an end of the bore. The cylinder head conducts sucked fluid to the bore. The sucked fluid enters the casing through an inlet therein and travels through a suction passage formed by a suction muffler and then through a base muffler before entering the cylinder head. The suction muffler includes exterior holes for communicating the suction passage of the suction muffler with the chamber of the casing, to thereby reduce the suction load occurring at the bore and valve plate.

Abstract: A sound absorber for jet engines and the like including a housing defining an inflow opening and an outflow opening. Sound absorbing elements positioned within the housing define substantially parallel entrance and exit planes. The sound absorbing elements include a plurality of gas guidance and baffle elements in two spaced-apart and parallel row-like arrangements, the elements having U-shaped, V-shaped, or semicircular cross-sections. The rows of sound absorbing elements are offset and the elements arranged such that the opened cross-sectional areas face each other in overlapping fashion. The entrance plane and the exit plane are inclined relative to an entrance flow through the inflow opening within an angular range of between 0.degree. to less than 90.degree..

Abstract: An exhaust silencer for receiving exhaust gasses from an engine includes inner and outer cylindrical walls and top and bottom closure plates. The inner wall and the top and bottom closure plates define a central collection chamber. Baffles extend alternately from the inner cylindrical wall towards the outer cylindrical wall and from the outer cylindrical wall towards the inner cylindrical wall, so as to define an undulating path for exhaust gasses as they pass from the central collection chamber to an outlet. Sound insulating material is attached to each of the upstream surfaces of the baffles, to the outer surface of the central collection chamber, to the inner surface of the outer cylindrical wall, and to the inner surfaces of each of the top and bottom closure plates. The sound insulating material is protected by expanded metal. The baffles are attached at their vertical edges to the expanded metal and not to the actual inner and outer cylindrical walls themselves.

Abstract: A method of using a material as an acoustical barrier in an ambient medium. The material comprises microbubbles having average outer diameters of 5 to 150 microns, bound together at their contact points. The material is characterized by either a porosity of 20 to 60 percent, or by voids between the microbubbles which have characteristic diameter within an order of magnitude of the viscous skin depth of the ambient medium, as calculated at 1 kHz; an air flow resistivity of 0.5.times.10.sup.4 to 4.times.10.sup.7 mks rayls/meter, and an attenuation of sound comparable to mass law performance. The microbubbles can be sintered into direct contact with each other, or one of many types of binder material can be used to support the microbubbles within a composite material.

Abstract: A method and apparatus for reducing noise originating in a flowing stream of gases in which the noise is progressively absorbed from the flowing stream to provide noise of reduced intensity relative to noise intensity at the upstream end of the stream, and the noise of reduced intensity actively attenuated with controlled sound energy. To facilitate the active attenuation of noise, the flowing stream is preferably divided into a plurality of smaller streams after a level of reduced intensities is attained and the active attenuation performed independently in each of the smaller streams. The apparatus is in the nature of a conduit (10) which defines a single duct extending from the inlet end (14) for a portion of the length of the conduit. Downstream, the single duct joins with a plurality of ducts (32,34) extending to the outlet end (16). An active noise attenuating device is preferably provided in each of the plurality of ducts.

Abstract: A silencer for silencing outlet pulses of compressed air, comprises an elongated housing provided with an inlet and an outlet. Fitted in the housing between the inlet and outlet, are at least two sound-absorbent elements each comprising a transverse member which extends from the longitudinal center line of the housing perpendicularly thereto and at least on two sides terminates at a distance from the housing, the transverse member has, at the end of those sides, a plate which is air impermeable and which extends essentially parallel to the longitudinal center line of the housing. The part of the baffle between the two sides extends up to the wall of the housing. The inlet and outlet open into the housing at locations spaced from the area defined between the plates, and the free cross-sectional surface area between the plates and the housing is less than 15% of the total cross-sectional surface area of the housing at the location of the plates.

Abstract: An improved muffler for silencing the exhaust emitted from a water cooled marine engine comprising a housing enclosure having a corrugated spacing means disposed within the housing partitioned by an angularly disposed inner planar baffle, the housing having an inlet for the exhaust gas and cooling water to fluidly communicate with a lower silencing chamber wherein the exhaust gas and cooling water are forced through a spacer passageway formed from the corrugated spacing means into an upper silencing chamber resulting in flow reversal and diminution in flow velocity so as to attenuate the exhaust noise, the exhaust gas and cooling water exiting the upper silencing chamber through an outlet fluidly communicated therewith and disposed collinearly with the input. The upper silencing chamber acting as a back flow preventor.

Abstract: A muffler is described which is traversed by a fluid. Housing (1) contains sound-absorbent built-in components. The sound-absorbent components contain corrugated sheets (11, 12) instead of fibrous materials. (FIG. 3).

Abstract: A muffler for an internal combustion engine or the like including a casing (21) having an inlet opening (28), an outlet opening (29), a first partition (43) secured in the casing (21) to divide incoming exhaust gases, and a second partition (46) secured in the casing (21) downstream of the first partition (43), which second partition (46) has an opening (39) through which the divided exhaust gases are converged and joined together for exiting the casing (21). The improvement in the muffler assembly which produces both sound attenuation and lower operating back pressure is to provide an intermediate partition (51) secured in the casing between the first and second partitions (43,46) which is formed to permit substantially uninterrupted or unimpeded flow of exhaust gases past the intermediate partition, while a forwardly facing concaved surface (52) reflects sound components in a direction away from the opening (39) in the second partition (46).

Abstract: An apparatus for modifying an exhaust stream of a diesel engine is provided. The apparatus includes a muffler arrangement having an exhaust inlet and an exhaust outlet in construct and arrange for sound attenuation therein. The apparatus also includes a catalytic converter arrangement positioned within the muffler arrangement. During operation, the exhaust flow is directed both through the muffler arrangement and the catalytic converter arrangement, to advantage.

Abstract: Improved emission control apparatus for use with a diesel engine which may include an enclosed cylindrical housing having an inlet and an outlet. A particulate trap is disposed in the housing between the inlet and outlet for collection and removal of particulates from the engine exhaust. The particulate trap includes an upstream section of reduced diameter and a downstream section of a diameter greater than the cylindrical housing to form an annular pocket therearound. The upstream section is provided with peripheral walls in which are provided uniformly spaced, longitudinally disposed, slotted apertures.

Abstract: The silencer combined with a catalytic converter comprises a housing including an inner tubular element in which a catalytic converter is fitted. The engine exhaust gases enter into the silencer through a venturi nozzle, flowing through a series of diaphragms made of porous ceramic material treated with catalytic materials, and flow out from an exhaust outlet of the silencer depleted of pollutants. The ceramic diaphragms may be cup shaped and provided with through-holes or ogive shaped with perforated walls and they may consist of elements formed by a plate provided with lateral flanges forming opposite cavities. The elements may be combined with one another in different manners to form a sequence of chambers with shape and volume best suited for each type of engine.

Abstract: A muffler for use on the exhaust system of the motor vehicle. The muffler has a central pipe which is surrounded by an outer pipe which leaves an annular space between the two. The outer pipe is open at both ends and the annular space is filled with a sound deadening material. The central pipe has openings which pass to the annular space and a perforated sound deadening member is affixed to the inner surface of the central pipe. Preferably, the outer pipe is outwardly flared at its upstream end, and the perforated sound deadening member is conical in shape.

Abstract: A motor vehicle muffler comprising a housing comprising two half shells, and an exhaust conduit having two ends. The conduit is disposed within the housing and is securely joined to the housing at its two ends. Filler material within the housing surrounds the exhaust conduit, the exhaust conduit being in contact only with the filler material between the two ends of the exhaust conduit. The housing has a length and a width and a depth, its length and width being greater than its depth, and at least one plate extends in the direction of the depth of the housing, between the half shells, and is securely joined to the half shells without touching the exhaust conduit. For this purpose, the plate has notches in which leg portions of the exhaust conduit are disposed in spaced relation to the plate. The half shells of the housing are joined to each other by a folded seam and are joined to the ends of the exhaust conduit by welded joints, and are also joined to the plate by welded joints.

Abstract: A vertical exhaust system for an internal combustion engine that incorporates a provision for receiving and trapping water, such as rain, that may enter the open upper end of the exhaust conduit. The exhaust system includes a vertical outer body and a perforated tube is disposed within the outer body and spaced therefrom to provide an annular chamber therebetween. A plug or closure is secured within the tube and is spaced from the lower end of the tube, thus closing off the tube. An annular flange interconnects the inner tube with the outer body and is spaced longitudinally below the plug, to thereby enclose the lower end of the chamber. A drain hole extends through the outer body and connects the chamber with the exterior. The drain hole is spaced above the flange, so that the space between the flange and the drain hole comprises a trap to collect water that may enter the upper end of the exhaust system.

Abstract: The invention is directed to an exhaust gas muffler for an internal combustion engine such as a two-stroke engine for portable handheld tools such as a motor-driven chain saw. The engine includes a cylinder and a piston conjointly defining a combustion chamber wherein combustion gases are generated and discharged as a flow of exhaust gas during operation of the engine. The exhaust gas muffler includes a housing having a shell-like wall defining a chamber for receiving the exhaust gas from the engine. The housing has a primary outlet opening formed in the wall of the housing for passing a primary component flow of the exhaust gas out of the chamber in a first direction. The housing has a secondary outlet opening formed in the wall thereof for passing a secondary component flow of the exhaust gas out of the chamber in a second direction.

Abstract: A compact muffler for an internal combustion engine provides significant sound attenuation and back pressure reduction. The muffler is fabricated in the form of an elongated rectangular box with the exhaust pipe connected to an inlet in the center of one end, and the tail pipe of the vehicle connected to an outlet through the opposite end. Several wedge-shaped or V-shaped exhaust pulse splitting plates are located within the casing to split and recombine the stream of exhaust pulses passing through the casing. The splitting devices are located in the casing in positions which cause the different split streams of the exhaust pulses to be intercepted at different distances to cause the pulses passing through different parts of the casing to be out of phase with one another. The out-of-phase streams of the split exhaust pulses are recombined to flow out of the outlet.

Abstract: The invention concerns a reactive sound attenuator for air-conditioning ducts, in particular for air ducts in paper mills. The sound attenuator includes at least two chambers separated from another by means of a partition wall. The partition wall is provided with an opening or with a tube placed in the direction of flow of the air flowing through the sound attenuator, the air flowing through said opening or tube out of one chamber into the other. The main plane of the partition wall is at an acute angle in relation to the direction of air flow through the sound attenuator. Preferably, the partition wall is at an angle .alpha. from about 40.degree. to about 70.degree. in relation to the direction of air flow through the sound attention.

Abstract: A muffler for muffling engine operating sounds and including a cylindrical shell closed at opposite ends by double-walled closure caps. The space within the shell is partitioned into three axially contiguous chambers. A gas charging pipe projects through one end of the shell and axially within the shell, and has two pairs of facing discharge elbows for discharging gas from the charging pipe at locations in the first of the chambers. A first pair of gas transfer pipes extends from the first chamber into the central chamber to points of opposed gas discharge. A second pair of gas transfer pipes extends from the central chamber into the third or discharge chamber, and from this location, the gas passes out of the muffler via a discharge pipe.

Abstract: This invention relates to sound attenuating mufflers, and more particularly to sound attenuating mufflers for dampening sound waves of various frequencies above a pre-selected cut-off frequency. Specially positioned acoustical insulation is provided to partially attenuate sound waves of a relatively low frequency. The insulation is carried in a chamber having one dimension of sound wave travel on the order of one-tenth the wavelength of a preselected cutoff frequency above which sound attenuation is desired. An adjacent chamber substantially free of insulation has one dimension of sound wave travel on the order of one-quarter wavelength of the cutoff frequency.

Abstract: An improved muffler for silencing the exhaust emitted from a water cooled marine engine comprising a housing enclosure partitioned by an angularly disposed inner planar baffle, the housing having an inlet for the exhaust gas and cooling water to fluidly communicate with a lower silencing chamber wherein the exhaust gas and cooling water are forced through a central passageway into an upper silencing chamber resulting in flow reversal and diminution in flow velocity so as to attenuate the exhaust noise, the exhaust gas and cooling water exiting the upper silencing chamber through an outlet fluidly communicated therewith and disposed collinearly with the input. The upper silencing chamber acting as a back flow preventor.

Abstract: A discharge muffler construction having a casing which defines a noise attenuation cavity and which is provided with an inlet and outlet located at substantially opposite portions thereof and communicating with the cavity, a baffle plate in the cavity intermediate the inlet and outlet and partitioning the same into at least two chambers, the baffle plate having an arcuate surface concave to the inlet, an aperture through the baffle plate, and a tubular conduit mounted through the aperture and placing the chambers in fluid communication.

Abstract: An adjustable sound attenuating device comprised of an elongated outer main shell of a predetermined diameter, with an inlet coupling and an outlet coupling. The device has located within the shell singular or multiple independent baffle components comprised of a solid baffle plate, a perforated baffle plate, an optional perforated baffle plug, and several chambers provided by the baffle components. The solid and perforated baffle plates have a funnel shape to provide for smooth directional flow of exhaust gases. The perforated baffle plate is pierced with a plurality of openings to allow for the flow of the exhaust gases through the chambers. The perforated baffle tube is pierced with inwardly angled louvers spaced equally around the circumference and staggered to follow a spiral path lengthwise around the perimeter of the tube for routing gases through the chambers.

Abstract: A Helmholtz resonator is disposed interiorly of a gas-carrying conduit to attenuate noise passing through the conduit. The Helmholtz resonator encloses a volume that is communicated to the gas flow by a through hole in the wall of the enclosure. The conduit comprises two parts that telescopically snap together to capture the Helmholtz resonator.

Abstract: A sound absorbing muffler constuction is provided. The muffler includes a s conduit having an unobstructed gas flow path and a plurality of perforations passing through its walls along a portion thereof. A sound attenuator body encases the perforated portion of the gas conduit such that a sound absorbing space is formed between the outer wall of the gas conduit and the inner wall of the sound attenuator body. A plurality of parabolically shaped baffles are located in the sound absorbing space. Each baffle is radically disposed and axially extended along the direction of the gas flow. The baffles direction the propagation of acoustic energy entering the sound absorbing space such that the energy traverses a substantially longer path than if no baffles were present. Thus, the acoustic energy is subject to a greater amount of possible attenuation within the sound absorbing space.

Abstract: A muffler for reducing noise associated with exhaust systems includes an assembly of exhaust tubes and drop-in baffles fixed inside channels defined in a clamshell-type muffler chamber formed from two stamp-formed mating external shells.

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: A compact, sound-attenuating muffler for an internal combustion engine or the like. The muffler has a divergently tapered partition located near the inlet of the muffler for dividing the exhaust gases into two pulse streams with similar sound frequencies to achieve sound attenuation when the streams are converged back together. The diverging partition creates a low-pressure volume or region on the partition's downstream side where unignited fuels may accumulate. The partition is formed with a passageway to provide communication of live fire from the inlet of the muffler to the low-pressure volume for ignition of any unignited fuel. A method of communication of live fire from the inlet of the muffler to the low-pressure volume on the downstream side of the diverging partition in the muffler also is described.

Abstract: A sound attenuating device is provided for attenuating noise in an exhaust system. The attenuating device includes an inlet end, an outlet end and a constricted portion therebetween. In use, the attenuating device may be disposed in a tubular housing or may be an integral portion of a tail pipe, connecting pipe, or muffler. Further, a sound suppressing system is described including one or more attenuating regions including attenuating devices. The attenuating regions are spaced to attenuate desired frequencies. Expansion chambers formed between attenuating regions contribute to sound suppression.

Abstract: A muffler for attenuating pulsations within the hydraulic fluid of an hydraulic elevator includes a plurality of compressible elements for absorbing pressure pulsations within the fluid and a baffle for ensuring that the flow of fluid contacts the elements sufficiently to absorb such pulsations, the baffle allowing a certain amount of flow to pass therethrough so that the pressure drop around the baffle is not so extreme so as to cause the muffler to cease to function.

Abstract: A muffler for muffling engine operating sound and including a double-walled cylindrical shell closed at opposite ends by double-walled closure caps. The space between the shell walls is filled with sound-absorbing solid particles. The shell is partitioned into three axially contiguous chambers. A gas charging pipe projects through one closure cap and axially within the shell, and has two pairs of facing discharge elbows for discharging gas from the charging pipe at locations in the first chamber. A first pair of gas transfer pipes extends from the first chamber into the central chamber to points of opposed gas discharge. A second pair of gas transfer pipes extends from the central chamber into the third or discharge chamber, and from this location, the gas passes out of the muffler via a discharge pipe.

Abstract: A low restriction exhaust treatment apparatus having a hollow outer shell into which a means for treating exhaust gas emitted from an internal combustion engine is disposed, end portions disposed at each end of the outer shell to sealingly close the inner portion of the shell, and end tubes inserted into apertures formed in the sealing end portions for facilitating exhaust flow into and out of the apparatus. The end tubes each have a plurality of axially extending, radially inwardly angled serrations formed about one end thereof to form a lead-in portion of a reduced diameter for ease of insertion of the tubes into the apertures of the end portions without creation of undesirable exhaust system back pressure.

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: In a preferred embodiment, a lug-removing pneumatic impact-gun air blast-deflector divertable of forwardly directed exhaust air blast, of which detachably-mountable air-blast deflector structure is mountable on the gun in a position divertable of forward air blast laterally in each of opposite lateral directions, having a vertically extending apertured portion mounted by a forwardly-located horizontally positioned bolt and inclusive of a horizontal rearwardly-extending portion having a distal end portion distally angled rearwardly-upwardly, thereby forming a laterally and upwardly directed air path positioned in front of air-blast exits of the gun.

Abstract: A compressor bleed air passageway includes a duct having an upstream section (48) which terminates in a baffle (44) and a downstream duct section (54) having a forward portion (56) which surrounds the baffle (44). Bleed air flow through openings (58) in the baffle wall (52). This reduces velocity of the bleed air stream at the duct discharge port to a value equal to or less than Mach 1.0. The baffle (44) has virtually no effect on a low-velocity, low-pressure air stream. The downstream duct section (54) may be perforated and surrounded by outer wall (64) to form sound-absorbing chambers (66).

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: An improved muffler of relatively large size for internal combustion engines is shown, which comprises a main hollow shell, assembled from half sections with caulked flanges to join the sections together into an airtight enclosure, at least one perforated baffle plate having its periphery clamped between the opposite edges, exhaust inlet and outlet ports. The baffle plate is bent into a curve defining in the inside of the shell chambers differing in volume from one another, through which the exhaust gases from an engine are forced to flow so that the gases alternately expand and contract. In addition to the rigid integration of the baffle plate with the shell by caulking, various interlocking and elastic members rigidly interconnect between the plate and the inside walls of the shell in such a manner as to reduce development or transmission of the vibrations in the shell components due to the pressure oscillations of the exhaust gases.

Abstract: A muffler assembly includes an inner outlet tube having a tubular portion, a frusto-conical portion and a flange portion having an expanded orifice facing the outlet of an inlet tube. Both the outlet tube and inlet tube extend within a chamber defined in an outer housing. The chamber is divided into two or more subchambers by a baffle which extends between the outlet tube and the housing. One or more holes in the baffle improve the sound attenuation characteristics of the muffler. The invention also comprehends a novel blank used in forming the outlet tube, and three alternative methods which may be used to form the outlet tube.

Abstract: A muffler device for reducing the noise level of an internal combustion engine as exhaust gases and sound waves produced by the operation of the engine are expelled into the atmosphere is disclosed. The device is placed in the exhaust system, being disposed within the exhaust pipe or pipes as close to the exhaust manifold as possible. The device has a sound chamber for attenuating sound waves entering the chamber by deflection of the sound waves back toward their source and a venturi for drawing exhaust gases through the device and expelling them to the atmosphere.

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: An in-line noise attenuation device for insertion into a gas induction system, such as the air induction system of an automotive vehicle internal combustion engine. The device comprises two plastic parts snap-fitted together. One part is an outer tube, and the other part, an insert disposed within the first part. The insert comprises a hollow ogival-shaped section that is axially coextensive with a frusto-conically shaped section of the outer tube to form an annular flow path of substantially constant cross section for the inducted air. The flow then passes through apertures in the insert to enter a venturi section. The flow continues through the venturi section and then exits the device. The venturi section serves to choke noise that propagates from the engine in the direction opposite the direction of airflow. The noise is reflected back to the engine by the hollow interior of the ogival-shaped section which is open toward the venturi section.

Abstract: A muffler has a muffler body within which is located an intermediate duct pipe colinear with the exhaust and tail pipes, so that exhaust gas from the exhaust duct pipe can pass through a main flow route in the intermediate duct pipe in a substantially straight line without reflecting. An inner or by-pass pipe forms a gas by-pass and has gas flow restriction elements.

Abstract: An exhaust tube capable of having a better silencing effect without adversely affecting the horsepower output of an engine is provided. The exhaust tube includes a tube body having two end plates, two spaced disks dividing the tube body into three gas chambers and a pipe having an expanded first end, a first horizontal portion, an inclined portion having a verturi tube, a perforated second horizontal portion, and a second opposite free end.

Abstract: A muffler for impeding and reflecting exhaust to reduce the formation of sound waves through a plurality of cone and barrier assemblies alternately and longitudinally spaced in a cylindrical body, with the apex of a conical member of each cone assembly and an outwardly extending cylindrical portion of each barrier assembly being directed towards the input end of the body. Exhaust flow paths for dissipating exhaust noise are defined by orifices formed in the conical members and cylindrical portions, and spaces between spokes joining each conical member to a circular member.

Abstract: An exhaust muffler for an internal combustion engine, comprising a hollow casing defining a plurality of chambers which are communicated with each other by way of small holes, an exhaust inlet tube fixedly attached to an exhaust port of an internal combustion engine at its one end and fitted into the casing from a hole provided therein for communication with one of the chambers at its other end, and an exhaust outlet passage communicating another one of the chambers to the atmosphere. The internal end of the exhaust inlet tube and an opposing casing wall are joined by a threaded fastener while the exhaust inlet tube is provided with an annular shoulder surface which fits into the hole of the casing in an air tight fashion, so that the mounting of the muffler can be accomplished simply by fitting the casing of the muffler onto the exhaust inlet tube which is typically attached to a cylinder head of an internal combustion engine in advance and tightening the threaded fastener.

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: Disclosed is an apparatus for use in nautical craft exhaust systems for removal of smoke and gaseous pollutants from exhaust gases generated therein. The apparatus is formed of an elongate section housing a plurality of double ear arcuate baffles which are individually offset at varying angles from a perpendicular to the longitudinal axis of the elongate section.