Abstract: An asbestos-free heat settable composition includes a fibrous reinforcement comprising aramid fibres in the form of a carded or needled non-woven web or felt, or a loosely woven or knitted fabric.

Abstract: A universal muffler construction (10) comprising: a muffler housing member (11), housing end plate members (12), a primary exhaust tube array (13), a baffle locator plate element (15), an auxiliary exhaust tubing array (16), and, auxiliary end plate elements (17) which are orientable with respect to one another to produce a variety of different internal muffler flow path configurations.

Abstract: A muffler is disclosed comprising a closed housing having an annular inlet and an annular outlet neck, and the housing having arranged therein a pair of axially extending pipes which are at least partially overlapping one another. One of the pipes is connected to the inlet neck and has a circumferentially arranged passageway to permit the exhaust gases to be directed from the inlet neck to the inside of the housing. The other pipe is connected to the outlet neck and has a circumferentially arranged passageway to permit the exhaust gases to be directed from inside the housing to the outlet neck.

Abstract: A vehicular muffler heat shield comprises at least one and preferably two longitudinally rigid, transversely flexible shield members. The shield members have muffler shell contacting, longitudinal ribs and raised, perforated shield panels. The shield members are identical and longitudinally slidable to fit mufflers of a range of lengths. The shield members are strapped to muffler shells by separate, flexible straps which conform the shield members to muffler shell contours.

Abstract: An exhaust silencer for an internal combustion engine, has an inlet, a noise-attenuation chamber containing a noise-attenuation matrix, and an outlet. The noise-attenuation chamber is of rectangular cross-section, and has one transverse dimension which is substantially larger than the other transverse dimension. The noise-attenuation matrix is constituted by a plurality of flat plates made of a material which is heat resistant and corrosion resistant, the plates being placed in spaced parallel relationship.

Abstract: A fluid discharge silencer for steam or other vapors or gases (with or without entrained solids or liquids) has an expansion chamber into which the fluid is passed through an inlet duct which discharges the fluid over an extended region of the chamber, flow deflector means in the chamber gradually redirecting the flow of gas from the inlet duct to change the direction of flow and to permit the gas phase components of the fluid to expand; the expansion chamber has an outlet which in use is connected to a silencer such as a parallel splitter silencer for further attenuating noise in the discharge flow. The inlet duct can be an elongated pipe having a longitudinal discharge aperture arrangement discharging the fluid into a trough-like redirecting structure which removes entrained components and redirects the flow.

Abstract: A muffler for an internal combustion engine includes an outer box composed of a plurality of separate bodies made of a formed sound insulation material and having portions joined by an adhesive, the outer box having an inlet for introducing an exhaust gas from the internal combustion engine and an outlet for discharging the exhaust gas, and a reinforcing member mounted on the joined portions to seal and reinforce the same. The muffler is simple in construction, has a good sound insulation capability, is lightweight, and sufficiently mechanically strong.

Abstract: The silencer device set forth herein in its various embodiments consists of at least one channelling bounded by at least one turn of a flat spiral, or of a cylindrical helix, or of a tapered helix, which may be blanked-off or open at one of its ends or at both of its ends, and/or incorporate radial holes or frontal holes in one or both faces. The outermost turn of the spiral, or the outermost surface of the helix, may either provide the shell of the device, or form a part thereof.

Abstract: Improvements in the attenuation of sounds emitted by an internal combustion engine exhaust system are achieved by shaping a muffler housing to substantially eliminate flat sound radiating surfaces, providing a circuitous exhaust gas flow path within the muffler housing and around an imperforate barrier and providing an exhaust gas outlet from the muffler housing which extends generally perpendicular to the direction of sound propagation within the housing near that outlet. The housing may be generally ellipsoidal in shape having a non-zero curvature which varys in a continuous manner at substantially all points on the surface and, subject to that requirement, designed to have a generally maximal volume subject to the dimensional constraints of its environment.

Abstract: A replacement muffler which can replace original equipment mufflers with substantially no modifications thereto, and methods for producing the same are disclosed. The replacement muffler is provided with a muffler body which only approximates the body of the original equipment muffler and a pair of replacement muffler nipples secured to the muffler body, having diameters substantially equal to the corresponding nipple diameters of the original equipment muffler and having lengths adapted to produce a nipple-to-nipple length substantially equal to the corresponding length of the original equipment muffler. The replacement muffler may be produced with a six to seven fold increase in production line efficiency by customizing only the nipple portions of the replacement muffler.

Abstract: The silencer in stainless material for exhaust systems of automobile vehicles is made of two shells with crimped flanges. The bottom portion of the two shells have transverse corrugations on which rest the arcuate bottoms of holder elements of a box shape the vertical wings of which terminate by corrugated edges into which enter semi-circular corrugations of conformed plates. The two shells, the holder elements and the conformed plates are maintained in place by the crimped edges.

Abstract: A heat-shielding plate is placed on a surface of automotive exhaust means. The heat-shielding plate has a fitting portion to be fixed to a portion of said exhaust means by bolt means, a heat-shielding plate body for covering the portion of the exhaust means, and a mesh portion disposed between the fitting portion and the heat-shielding plate body.

Abstract: Methods and apparatus for attenuating sound levels characterized by a muffler utilizing the splitting of exhaust gas flows followed by recombining of these split flows in mutually opposed relationship. Sequentially alternating expansion and contraction of the exhaust gas is caused to occur, during which increments of exhaust gas exit sequentially along the exhaust gas flow from the muffler.

Abstract: A textile interlacing jet is used to muffle noise in the frequency range of 3 kHz to 20 kHz by providing abrupt cross-sectional area changes. The jet includes a main body with a yarn inlet and a yarn outlet at opposite ends. A first reactive muffler is disposed in association with the yarn inlet and includes an expansion chamber and a restricted inlet to the expansion chamber, the ratio of the cross-sectional area of the expansion chamber to that of the restricted inlet being at least about 9:1, and preferably at least about 25:1. A second reactive muffler is disposed in association with the yarn outlet, and has similar abrupt cross-sectional area changes. A plurality of expansion chambers and restricted outlets may be provided in the second reactive muffler.

Abstract: A muffler for a motor vehicle is made up of a housing enclosing a pair of sheet metal plates impressed with semi-circular depressions with the plates combining to form a sinuously shaped gas duct of circular cross section. Walls positioned within the housing divide its interior into chambers. Perforations in the gas duct open into the chambers. Lugs are punched out of the sheet metal plates in a uniform pattern and the lugs in one plate are inserted through the corresponding punched openings in the other and are bent into locking engagement with the other plate. These lugs and the corresponding openings contribute to the mechanical strength of the muffler. The ends of the plates forming the inlet and outlet ends for the gas duct have flanges which also contribute to the mechanical strength of the muffler. Cooperating interfitting corrugations in the plates located at specific positions relative to the gas duct prevent partial short circuiting of the exhaust gas flow through the muffler.

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: At least one of the ends of the silencer an end chamber is defined between an intermediate planar dished wall and an end dished wall which is provided with a rounded and hollow boss. The boss substantially extends two exhaust gas tubes in front of which it is located and its apex is spaced from the intermediate dished wall by a distance which is slightly greater than the radius of the tubes so that the boss guides the change in direction of the gas flow between the tubes.

Abstract: The sound absorber includes a main body (1), a housing component (2) attached thereon and a cap (3) threaded onto the main body. The compressed air exiting from the compressed-air vibrator flows from a first chamber (4) into a second chamber (5) provided with labyrinth-like baffles (7) and from there into a larger third chamber (6). The relieved compressed air then flows outside through an annular outlet slit (8a). Through rotation of the cap (3) there can be varied the cross-section of the outlet slit (8a). The cap (3) thereby also serves as a throttle valve.The sound absorber is insensitive to oil-containing compressed air and, without an auxiliary throttle valve, facilitates a correlatable throttle of the exiting compressed air.

Abstract: An external housing for an exhaust muffler comprising at least one pipe section having one seamlessly converging end and at least one connecting piece seamlessly extending from the converging end, produced as a one-piece extrusion molded body of a malleable aluminum alloy. The housing may include a second pipe section joined undetachably to the first in alignment therewith. A seating part, e.g., a pipe socket, may be formed integrally with the converging end of the pipe section, projecting from that end into the interior of the pipe section.

Abstract: A mounting for a heat producing element of an automobile is described, in which elastic support members of rubber or an elastomeric material are positioned externally of a heat shield in a position in which they are exposed to unobstructed air flow beneath the automobile, and are isolated from radiant heat produced by the heat producing element in a manner minimizing the conduction of heat from said heat producing element.

Abstract: A muffler wherein the shell comprises a metal sheet the ends of which are retained together in an interlocked joint has a shielding strip on the interior of the tube secured thereto in overlapping relation to the interlock. Preferably the sheet is a two ply, one end of the inner ply being retained in the joint, the other end forming the shielding strip, the edge of which is spot welded to the interior surface of the shell. The muffler is resistant to damage from back-fires.

Abstract: An exhaust muffler for an internal combustion engine. The muffler has a pair of half-shells which are held together to form a muffler chamber. The half-shell structure is internally lined with sound absorbing material. The chamber inside this material is divided into a plurality of compartments by partitions which at their edges abut only the sound absorbing material so as further to alternate the exhaust sounds.

Abstract: An exhaust system for an internal combustion engine which comprises an exhaust manifold connected to said engine, a communication pipe connected at one end to the exhaust manifold, a bellows type exhaust tube connected at one end to the other end of the communication pipe, a second communication pipe connected at one end to the other end of the exhaust tube, a muffler connected at one end to the other end of the second communication pipe and a tail pipe connected at one end to the other end of the muffler. The exhaust tube comprises a multi-layered bellows, a cylindrical wire blade, or wire mesh shield, in outwardly radial spaced relationship to the bellows, the opposed ends of the cylindrical wire mesh shield having a reduced diameter, and retainer rings securing the opposed ends of the wire mesh shield to the communication pipes.

Abstract: Engine noise attenuator for motor-propelled boats including a housing made of resilient material and having one end connected to the exhaust pipe and a perforated pipe disposed within the housing and supported by the housing wherein the perforated pipe is in communication with the exhaust pipe such that the perforations form a resonance chamber between the housing and the exhaust pipe.

Abstract: The exhaust or the inlet duct of a marine gas turbine engine power plant installation comprises a porous duct, a plurality of circumferentially arranged non-porous channel members attached to and axially spaced along the porous duct, the channel members and the porous duct together defining a plurality of annular noise attenuating cells, and at least one layer of heat insulating material surrounding the channel members, the insulating material being contained with a cover and attached to the porous duct.

Abstract: A multiple flow marine muffler constructed of resilient material having an elongated generally cylindrical hollow shell with reduced diameter inlet and outlet portions, and longitudinally spaced pairs of opposed baffles within the shell which define a plurality of chambers decreasing in axial length from the chamber adjacent the inlet portion to the chamber adjacent the outlet portion. The several pairs of baffles are so shaped, sized and oriented as to provide multiple flow paths for exhaust gases and cooling water through the muffler, namely, a central straight through path for engine idle condition, a first pair of undulating paths in side by side out of phase relation, and a second pair of undulating paths in side by side out of phase relation which are oriented in the cylindrical shell 90.degree. away from the first pair.

Abstract: A muffler comprises a plurality of stackable stages 1, 2 and 3. Each stage is comprised of a phase opposition circuit. In each phase opposition circuit exhaust gases are divided into two paths towards an outlet where they are recombined. The difference in length between the two paths equals half a wavelength of a selected frequency.

Abstract: A muffler incorporates a tubular shell that has an acoustically reflective interior circumferential surface. In successive sections taken transversely through the shell, the acoustically reflective surface has at least a portion of its circumference shaped to define at least part of an ellipse or a parabola. Between an inlet into and an outlet from the shell, a fluid flow path extends along an axis lengthwise through the shell. A sound absorptive treatment is disposed along a second axis extending lengthwise through the shell. The treatment is spaced from but communicates with the fluid flow path. At least one of the two axes is defined by corresponding focal points of successive transverse sections taken through the curvilinear portion of the circumference of the acoustically reflective shell surface. In operation, sound emitted from fluid flowing along the fluid flow path is reflected by the reflective shell surface to the sound absorptive treatment.

Abstract: A fiberglass mat of a particular formulation is used to insulate exhaust system components such as mufflers, converters, and conduits.

Abstract: A connecting line or exhaust pipe for disposal within the exhaust system of a motor vehicle driven by an internal-combustion engine between the exhaust manifold of the engine and the muffler. The connecting line is formed of two bowl-shaped sheet metal half-shells which are preshaped, e.g., by pressing, deep drawing or the like, and which are superposed on one another, and firmly connected together. The half-shells of the connecting line have a shape such that the connecting line has a non-circular substantially flat cross section with respect to its vertical dimension when the connecting line is connected in the vehicle exhaust system.

Abstract: A gas turbine engine exhaust duct of combination circular and rectangular configuration, and accompanying muffler which provides cooling and silencing of exhaust flow from the gas turbine engine. The arrangement utilizes minimum space without sacrifice of performance.

Abstract: A silencer device for attenuating fluid borne noise has a flow through housing with an open upstream end for the entrance of a fluid into the housing and a coaxial open downstream end for exhausting the fluid from the housing. An entrance header formed of a plurality of spaced apart intersecting elongated members defining a plurality of rectangular entrance apertures, each elongated member having a V-shaped transverse cross-section shape and oriented with its apex pointed in an upstream direction, is coextensively disposed over the upstream open end. An exhaust header also formed of a plurality of spaced apart intersecting elongated members defining a plurality of rectangular exhaust apertures, each elongated member having a V-shaped transverse cross-section shape and oriented with its apex pointed in a downstream direction, is coextensively disposed over the downstream open end.

Abstract: An `in-line` unit for use in compressor station piping, arranged to reduce the level of noise generated when the blowdown valves of the station piping are opened in an emergency to vent the high pressure gas therein to atmosphere, the unit comprising a pipe section having a plurality of orifice plates the number and hole area of which is designed to ensure sub-sonic flow through each plate. The unit is preferably used in combination with a modified form of silencer element connected `in-line` downstream thereof.

Abstract: A muffler incorporates a tubular shell that has an acoustically reflective interior circumferential surface. In successive sections taken transversely through the shell, the acoustically reflective surface has at least a portion of its circumference shaped to define at least part of an ellipse or a parabola. Between an inlet into and an outlet from the shell, a fluid flow path extends along an axis lengthwise through the shell. A sound absorptive treatment is disposed along a second axis extending lengthwise through the shell. The treatment is spaced from but communicates with the fluid flow path. At least one of the two axes is defined by corresponding focal points of successive transverse sections taken through the curvilinear portion of the circumference of the acoustically reflective shell surface. In operation, sound emitted from fluid flowing along the fluid flow path is reflected by the reflective shell surface to the sound absorptive treatment.

Abstract: High temperature resisting cordage is wrapped around an exhaust gas muffler housing and covered with an outer wrap of metal to provide sound and thermal insulation for the muffler.

Abstract: A reactor is made deformable by thermal stresses, as the construction thereof includes accordion type portions. The reactor comprises an inner core shell containing inlet and outlet pipe sections formed integral therewith, and extending outwardly through an outer core shell to an outer shell member. Each shell member consists of first and second shell counterparts which may be fixed together in a common plane.

Abstract: A muffler for exhaust gases is constructed with a small casing skirting a portion of an exhaust gas inlet pipe. The end of the casing nearest the exit port of the pipe is blocked and provided with a layer of sound absorbing material. The exhaust gases exiting the pipe turn within the layer and flow back up the outside of the pipe inside the casing and exit at a point near the upper end of the casing. The structure has sound arresting properties, particularly for high frequency sounds.

Abstract: An air intake silencer includes a box-shaped expansion chamber constructed of identically dimensioned, separable havles respectively connected to a carburetor intake system and a tubular intake member. In a basic form of the silencer, the tubular intake member includes a metal tube mounted in the expansion chamber and having a single elongate opening in communication with the interior of the chamber, the tube being connected so as to form a continuation of a hose located exteriorly of the chamber. For obtaining more effective silencing, air distribution and filtering the basic form of the silencer may be altered by dividing the expansion chamber in half with a perforated baffle plate and/or by substituting a perforated metal tube for the aforedescribed metal tube.

Abstract: A streamlined monolithic internal combustion engine muffler is disclosed, which muffler deadens the noise generated during combustion and diffuses the gaseous composition exhausted into the atmosphere.

Abstract: A muffler for a motor vehicle which serves as a reactor for oxidizing or re-burning unburned constituents in engine exhaust gases. The muffler comprises a heat insulated inner shell in which a chamber is provided with a silencing unit and is kept at a high temperature sufficient to oxidize the unburned constituents, an outer shell covering the heat insulated inner shell, and means for absorbing the thermal expansion of the inner shell provided in a supporting device of the inner shell. An exhaust pipe extends into the inner shell and has one end provided with a collector. The collector has a guide opening to pass engine exhaust gases into the inner shell while achieving mixing of the exhaust gases in the collector thereby to promote oxidizing reaction of the exhaust gases.

Abstract: The application discloses a new silencer for internal combustion engines. This silencer comprises an internal resilient tube capable to vibrate longitudinally and permeable to the exhaust gas and an external sheath. An end piece closes the internal tube. Spacers are secured to the internal tube and another end piece provided with apertures is secured to the end of the external sheath. The exhaust gases exit from the internal tube through the space comprised between the spacers and the external sheath towards said apertures in the other end piece.

Abstract: An air intake silencer includes a box-shaped expansion chamber constructed of identically dimensioned, separable halves respectively connected to a carburetor intake system and a tubular intake member. In a basic form of the silencer, the tubular intake member includes a metal tube mounted in the expansion chamber and having a single elongate opening in communication with the interior of the chamber, the tube being connected so as to form a continuation of a hose located exteriorly of the chamber. For obtaining more effective silencing, air distribution and filtering the basic form of the silencer may be altered by dividing the expansion chamber in half with a perforated baffle plate and/or by substituting a perforated metal tube for the aforedescribed metal tube.