US20110214937A1 - Removable exhaust baffle - Google Patents
Removable exhaust baffle Download PDFInfo
- Publication number
- US20110214937A1 US20110214937A1 US12/660,874 US66087410A US2011214937A1 US 20110214937 A1 US20110214937 A1 US 20110214937A1 US 66087410 A US66087410 A US 66087410A US 2011214937 A1 US2011214937 A1 US 2011214937A1
- Authority
- US
- United States
- Prior art keywords
- exhaust pipe
- removable baffle
- occlusion
- removable
- recited
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
- F01N1/083—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using transversal baffles defining a tortuous path for the gases or successively throttling gas flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/18—Construction facilitating manufacture, assembly, or disassembly
- F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
Definitions
- the present invention relates generally to sound attenuation. More specifically, the present invention comprises an exhaust baffle which may be selectively placed in an exhaust pipe to reduce emitted exhaust sounds when desired.
- the present invention is particularly suited for use in motorcycle exhausts, and the embodiments disclosed in detail will use motorcycle exhausts as the example.
- the present invention comprises a selectively removable exhaust baffle which can be placed within an exhaust pipe to muffle the emitted sound.
- the removable baffle preferably includes a frame having a pair of legs joined by a spring portion.
- One or more transverse occluding plates are mounted on the frame.
- the frame is sized so that when it is pushed into the exhaust pipe it must be compressed. This compression holds the frame in place.
- the transverse occluding plate or plates lie against the interior wall of the exhaust pipe in an orientation which is preferably perpendicular to the direction of gas flow through the exhaust pipe. The gas flow must therefore pass around the plate or plates, thereby attenuating the sound.
- a handle is preferably provided. This extends out the rear of the exhaust pipe to facilitate removal of the baffle.
- a locking feature is preferably also provided to securely hold the baffle in position until removal is desired.
- the baffle may be constructed in a variety of ways, with the preferred embodiment being formed by assembling several pieces which may be stored flat when not in use.
- FIG. 1 is a perspective view, showing a preferred embodiment of the removable baffle in an assembled state.
- FIG. 2 is a perspective view, showing the removable baffle being inserted into an exhaust pipe.
- FIG. 3 is a sectional elevation view, showing the removable baffle in position within an exhaust pipe.
- FIG. 4 is an exploded perspective view, showing a preferred embodiment in which the removable baffle is assembled from flat pieces.
- FIG. 5 is a perspective view, showing an embodiment in which a separate spring is used.
- FIG. 1 shows removable baffle 10 in an assembled state.
- Frame 12 preferably assumes the shape of a V-spring, having first leg 26 and second leg 28 joined by spring portion 14 .
- spring portion 14 tending to bias the two legs apart.
- One or more occlusion plates are provided to impede the flow of exhaust gases when the removable baffle is placed in an exhaust pipe.
- the number and location of the occlusion plate or plates can be varied to suit a particular application.
- front occlusion plate 16 and rear occlusion plate 20 are attached to first leg 26 .
- Middle occlusion plate 18 is attached to second leg 28 .
- the occlusion plates shown in the embodiment of FIG. 1 are half-disks, the diameter of which conforms to the inner diameter of the exhaust pipe. These features allow the circular portion of each occlusion disk to fit securely against the interior of the exhaust pipe.
- Handle 22 is an extension of the first leg. It is intended to facilitate the removal of the device from an exhaust pipe, as will be described in more detail subsequently.
- FIG. 2 shows removable baffle in position and ready to be inserted into a conventional motorcycle exhaust pipe 30 .
- Frame 12 of the removable baffle is preferably sized so that the two legs must be compressed together in order to slide the device into the exhaust pipe. The restoring force of spring portion 14 will then tend to force the two legs outward against the interior of the exhaust pipe—thereby frictionally engaging the surface and retaining the device in position.
- a mechanical interlocking feature can be provided between the removable baffle and the exhaust pipe.
- Protrusion 24 is provided on first leg 26 .
- FIG. 2 the reader will observe the inclusion of a transverse hole 34 in exhaust pipe 30 . When the user slides the removable baffle into the exhaust pipe, protrusion 24 snaps into hole 34 and secures the removable baffle in place.
- FIG. 3 is a sectional elevation view showing the removable baffle in place within an exhaust pipe 30 .
- the reader will note how protrusion 24 is secured within hole 34 .
- This interlocking feature impedes the tendency of the flowing exhaust gases to blow the device out of the exhaust pipe.
- the embodiment shown uses three evenly spaced occlusion plates (front occlusion plate 16 , middle occlusion plate 18 , and rear occlusion plate 20 ). These redirect gas flow 42 through a serpentine path. The effect is substantially reduced exhaust noise.
- Handle 22 preferably extends beyond the exit plane of the exhaust pipe to facilitate the removal of the device. In the orientation shown, the user need only press down on the handle to disengage the mechanical interlock. He or she may then slide the removable baffle to the rear and remove it from the tailpipe.
- occlusion plates may assume a virtually infinite variety of forms. They are shown as being perpendicular to the exhaust gas flow but this need not be the case. They may be placed at any suitable angle to the exhaust flow. It is also possible to provide one, two, three, four, five, or more occlusion plates in order to create the desired level of sound attenuation. In some applications it may also be desirable to provide perforated occlusion plates. Simple holes may be provided, or a more complex array of slots or other shapes.
- the inventive device will be effective in some applications even though over half of the surface area of each plate is opened by perforations.
- Many law enforcement agencies test for exhaust attenuation by simply inserting a pointer into the exhaust pipe and feeling for the presence of an obstruction. It is therefore significant that the perforation design used still leave enough solid material to obstruct the passage of such a pointer.
- FIG. 4 shows an embodiment in which each occlusion plate is made removable from frame 12 .
- middle occlusion plate 18 is provided with a notch 44 sized to interlock with middle receiver 38 and the accompanying land 60 .
- Front occlusion plate 16 is designed to lock into front receiver 40 and rear occlusion plate 20 is designed to lock into rear receiver 36 .
- a user may select and install one, two, or three occlusion plates without the need for tools or fasteners.
- the entire device may be disassembled and stored in a flat state.
- FIG. 5 shows a different embodiment having a fixed number of occlusion plates.
- Separate first leg 46 and separate second leg 48 are forged or cast from a suitable metal with the occlusion plates and other features integrally formed.
- the two legs are joined by a separate spring 50 , which is connected via first joint 52 and second joint 54 .
- heat-resistant metals are the preferred materials—with stainless steel being one good example.
- the inventive device and method for its installation are primarily directed toward reducing exhaust noise.
- the device can be used to modify exhaust back pressure and to otherwise “tune” the exhaust to produce a desired sound.
- the invention should not be viewed as being limited solely to sound attenuation.
Abstract
Description
- Not Applicable.
- Not Applicable.
- Not Applicable
- 1. Field of the Invention
- The present invention relates generally to sound attenuation. More specifically, the present invention comprises an exhaust baffle which may be selectively placed in an exhaust pipe to reduce emitted exhaust sounds when desired.
- 2. Description of the Related Art
- The present invention is particularly suited for use in motorcycle exhausts, and the embodiments disclosed in detail will use motorcycle exhausts as the example. However, the reader should bear in mind that the invention is by no means limited to this application and may be more broadly applied to any scenario in which noise reduction or an increase in back flow pressure is desired.
- Motorcycles traditionally have fairly simple exhaust systems. This is particularly true for “V-Twin” engines such as those produced by HARLEY-DAVIDSON. Such exhausts typically provide fairly low sound attenuation. The result is a loud and “thunderous” exhaust tone that many motorcycle enthusiasts find desirable. The loud exhaust noise is in fact a signature effect of this type of motorcycle.
- Unfortunately for those desiring the traditional exhaust sound effects, many municipalities have passed noise ordinances defining a maximum sound level permitted for operation of a moving vehicle. Many motorcycles exceed this sound level and may therefore not be legally operated within the particular municipality. The ordinances are not uniform, however. Thus, a motorcycle may be legally operated in many areas yet prohibited from a few areas which have enacted more strict noise ordinances.
- One solution is of course to add a muffling device to reduce the exhaust noise so that it complies with the most restrictive noise ordinance. This would require significant sound attenuation. Most motorcycle owners would prefer to have the loud sound available wherever it is legal, and apply the reduced sound only when required. One can of course change exhaust systems, but this is cumbersome. One can also equip the exhaust with complex dual pathways selected by a butterfly valve (as is done in some automotive applications). Such mechanisms add to the weight and complexity of a motorcycle, and additionally tend to spoil the “clean” appearance most motorcycle enthusiasts desire. Thus, it would be preferable to provide a noise attenuating device which could be selectively added to an existing exhaust system without requiring significant modifications. The present invention proposes just such a design.
- The present invention comprises a selectively removable exhaust baffle which can be placed within an exhaust pipe to muffle the emitted sound. The removable baffle preferably includes a frame having a pair of legs joined by a spring portion. One or more transverse occluding plates are mounted on the frame. The frame is sized so that when it is pushed into the exhaust pipe it must be compressed. This compression holds the frame in place. The transverse occluding plate or plates lie against the interior wall of the exhaust pipe in an orientation which is preferably perpendicular to the direction of gas flow through the exhaust pipe. The gas flow must therefore pass around the plate or plates, thereby attenuating the sound.
- A handle is preferably provided. This extends out the rear of the exhaust pipe to facilitate removal of the baffle. A locking feature is preferably also provided to securely hold the baffle in position until removal is desired. The baffle may be constructed in a variety of ways, with the preferred embodiment being formed by assembling several pieces which may be stored flat when not in use.
-
FIG. 1 is a perspective view, showing a preferred embodiment of the removable baffle in an assembled state. -
FIG. 2 is a perspective view, showing the removable baffle being inserted into an exhaust pipe. -
FIG. 3 is a sectional elevation view, showing the removable baffle in position within an exhaust pipe. -
FIG. 4 is an exploded perspective view, showing a preferred embodiment in which the removable baffle is assembled from flat pieces. -
FIG. 5 is a perspective view, showing an embodiment in which a separate spring is used. -
-
10 removable baffle 12 frame 14 spring portion 16 front occlusion plate 18 middle occlusion plate 20 rear occlusion plate 22 handle 24 protrusion 26 first leg 28 second leg 30 exhaust pipe 32 opening 34 hole 36 rear receiver 38 middle receiver 40 front receiver 42 gas flow 44 notch 46 separate first leg 48 separate second leg 50 spring 52 first joint 54 second joint 60 land -
FIG. 1 showsremovable baffle 10 in an assembled state.Frame 12 preferably assumes the shape of a V-spring, havingfirst leg 26 andsecond leg 28 joined byspring portion 14. Those skilled in the art will appreciate that the two legs may be forced toward each other, withspring portion 14 tending to bias the two legs apart. - One or more occlusion plates are provided to impede the flow of exhaust gases when the removable baffle is placed in an exhaust pipe. The number and location of the occlusion plate or plates can be varied to suit a particular application. In the embodiment shown,
front occlusion plate 16 andrear occlusion plate 20 are attached tofirst leg 26.Middle occlusion plate 18 is attached tosecond leg 28. - The occlusion plates shown in the embodiment of
FIG. 1 are half-disks, the diameter of which conforms to the inner diameter of the exhaust pipe. These features allow the circular portion of each occlusion disk to fit securely against the interior of the exhaust pipe.Handle 22 is an extension of the first leg. It is intended to facilitate the removal of the device from an exhaust pipe, as will be described in more detail subsequently. -
FIG. 2 shows removable baffle in position and ready to be inserted into a conventionalmotorcycle exhaust pipe 30.Frame 12 of the removable baffle is preferably sized so that the two legs must be compressed together in order to slide the device into the exhaust pipe. The restoring force ofspring portion 14 will then tend to force the two legs outward against the interior of the exhaust pipe—thereby frictionally engaging the surface and retaining the device in position. - Additional features may be optionally added to more securely retain the removable baffle within the exhaust pipe. A mechanical interlocking feature can be provided between the removable baffle and the exhaust pipe. Returning briefly to
FIG. 1 , an example of this mechanical interlocking feature is provided.Protrusion 24 is provided onfirst leg 26. Turning back toFIG. 2 , the reader will observe the inclusion of atransverse hole 34 inexhaust pipe 30. When the user slides the removable baffle into the exhaust pipe,protrusion 24 snaps intohole 34 and secures the removable baffle in place. -
FIG. 3 is a sectional elevation view showing the removable baffle in place within anexhaust pipe 30. The reader will note howprotrusion 24 is secured withinhole 34. This interlocking feature impedes the tendency of the flowing exhaust gases to blow the device out of the exhaust pipe. The embodiment shown uses three evenly spaced occlusion plates (front occlusion plate 16,middle occlusion plate 18, and rear occlusion plate 20). These redirectgas flow 42 through a serpentine path. The effect is substantially reduced exhaust noise. -
Handle 22 preferably extends beyond the exit plane of the exhaust pipe to facilitate the removal of the device. In the orientation shown, the user need only press down on the handle to disengage the mechanical interlock. He or she may then slide the removable baffle to the rear and remove it from the tailpipe. - Those skilled in the art will realize that the occlusion plates may assume a virtually infinite variety of forms. They are shown as being perpendicular to the exhaust gas flow but this need not be the case. They may be placed at any suitable angle to the exhaust flow. It is also possible to provide one, two, three, four, five, or more occlusion plates in order to create the desired level of sound attenuation. In some applications it may also be desirable to provide perforated occlusion plates. Simple holes may be provided, or a more complex array of slots or other shapes.
- The inventive device will be effective in some applications even though over half of the surface area of each plate is opened by perforations. Many law enforcement agencies test for exhaust attenuation by simply inserting a pointer into the exhaust pipe and feeling for the presence of an obstruction. It is therefore significant that the perforation design used still leave enough solid material to obstruct the passage of such a pointer.
-
FIG. 4 shows an embodiment in which each occlusion plate is made removable fromframe 12. As an example,middle occlusion plate 18 is provided with anotch 44 sized to interlock withmiddle receiver 38 and the accompanyingland 60.Front occlusion plate 16 is designed to lock intofront receiver 40 andrear occlusion plate 20 is designed to lock intorear receiver 36. In this fashion, a user may select and install one, two, or three occlusion plates without the need for tools or fasteners. When not in use, the entire device may be disassembled and stored in a flat state. -
FIG. 5 shows a different embodiment having a fixed number of occlusion plates. Separatefirst leg 46 and separatesecond leg 48 are forged or cast from a suitable metal with the occlusion plates and other features integrally formed. The two legs are joined by aseparate spring 50, which is connected via first joint 52 and second joint 54. - It may be necessary to leave the removable baffle in place for extended periods, during which all the components will be bathed in hot exhaust gases. Thus, heat-resistant metals are the preferred materials—with stainless steel being one good example.
- The inventive device and method for its installation are primarily directed toward reducing exhaust noise. However, those skilled in the art will also know that the device can be used to modify exhaust back pressure and to otherwise “tune” the exhaust to produce a desired sound. Thus, the invention should not be viewed as being limited solely to sound attenuation.
- The foregoing description and drawings comprise illustrative embodiments of the present invention. Having thus described exemplary embodiments of the present invention, it should be noted by those skilled in the art that the within disclosures are exemplary only, and that various other alternatives, adaptations, and modifications may be made within the scope of the present invention. Many modifications and other embodiments of the invention will come to mind to one skilled in the art to which this invention pertains having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Although specific terms may be employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation. Accordingly, the present invention is not limited to the specific embodiments illustrated herein, but is limited only by the following claims.
Claims (21)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US12/660,874 US8002080B1 (en) | 2010-03-05 | 2010-03-05 | Removable exhaust baffle |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/660,874 US8002080B1 (en) | 2010-03-05 | 2010-03-05 | Removable exhaust baffle |
Publications (2)
Publication Number | Publication Date |
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US8002080B1 US8002080B1 (en) | 2011-08-23 |
US20110214937A1 true US20110214937A1 (en) | 2011-09-08 |
Family
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Application Number | Title | Priority Date | Filing Date |
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US12/660,874 Expired - Fee Related US8002080B1 (en) | 2010-03-05 | 2010-03-05 | Removable exhaust baffle |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2500211A (en) * | 2012-03-13 | 2013-09-18 | Graeme Craib | Removable Exhaust Baffle Insert Silencer |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8424635B1 (en) * | 2012-01-13 | 2013-04-23 | Russell E. Klawunn | Firearm suppressor with relationally-rotated spacers disposed between baffles |
US10119779B1 (en) | 2017-06-27 | 2018-11-06 | Smith & Wesson Corp. | Suppressor for firearm and baffle cup therefor |
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US3969895A (en) * | 1974-06-24 | 1976-07-20 | John Krizman | Power control valve attachment for two cycle motorcycle type engine exhaust systems |
US4966253A (en) * | 1989-08-23 | 1990-10-30 | Howard Stephens | Muffler device for exhaust systems |
US5434374A (en) * | 1993-12-01 | 1995-07-18 | Hsueh; Tien-Chu | Detachable filter and muffler device |
US5722237A (en) * | 1995-10-20 | 1998-03-03 | Kioritz Corporation | Muffler structure for internal combustion engine |
US5881555A (en) * | 1997-05-21 | 1999-03-16 | Brunswick Corporation | Exhaust pressure pulsation control apparatus for marine propulsion system |
US20040084247A1 (en) * | 2002-11-04 | 2004-05-06 | Tanekazu Kishida | Muffler silencer |
US6799423B2 (en) * | 2002-01-24 | 2004-10-05 | David L. Piekarski | Adjustable exhaust system for internal combustion engine |
US6848252B2 (en) * | 2002-06-06 | 2005-02-01 | James Charles Maybeck | Exhaust enhancement for aftermarket motorcycle exhaust pipes with a straight pipe type design and with inside pipe diameter from 1.875″ and larger |
US20050252712A1 (en) * | 2004-04-30 | 2005-11-17 | David Gau | Repositionable attenuator |
US20050274568A1 (en) * | 2004-06-11 | 2005-12-15 | Falco Robert N | High sound attenuating hearing protection device |
US7104359B1 (en) * | 2003-08-28 | 2006-09-12 | Zelinski Joseph R | Muffler having a baffle with angled plates |
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US7510046B2 (en) * | 2005-10-10 | 2009-03-31 | Cabot Safety Intermediate Corporation | Low attenuating push-in earplug with integral handle |
US20090283358A1 (en) * | 2008-05-15 | 2009-11-19 | Hughey Christopher | Sound-reducing baffle |
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US20040238273A1 (en) | 2003-03-19 | 2004-12-02 | Fritskey John F. | Interchangeable core muffler |
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US1496509A (en) * | 1917-11-02 | 1924-06-03 | Titeflex Metal Hose Corp | Muffler |
US3969895A (en) * | 1974-06-24 | 1976-07-20 | John Krizman | Power control valve attachment for two cycle motorcycle type engine exhaust systems |
US4966253A (en) * | 1989-08-23 | 1990-10-30 | Howard Stephens | Muffler device for exhaust systems |
US5434374A (en) * | 1993-12-01 | 1995-07-18 | Hsueh; Tien-Chu | Detachable filter and muffler device |
US5722237A (en) * | 1995-10-20 | 1998-03-03 | Kioritz Corporation | Muffler structure for internal combustion engine |
US5881555A (en) * | 1997-05-21 | 1999-03-16 | Brunswick Corporation | Exhaust pressure pulsation control apparatus for marine propulsion system |
US6799423B2 (en) * | 2002-01-24 | 2004-10-05 | David L. Piekarski | Adjustable exhaust system for internal combustion engine |
US6848252B2 (en) * | 2002-06-06 | 2005-02-01 | James Charles Maybeck | Exhaust enhancement for aftermarket motorcycle exhaust pipes with a straight pipe type design and with inside pipe diameter from 1.875″ and larger |
US20040084247A1 (en) * | 2002-11-04 | 2004-05-06 | Tanekazu Kishida | Muffler silencer |
US7104359B1 (en) * | 2003-08-28 | 2006-09-12 | Zelinski Joseph R | Muffler having a baffle with angled plates |
US20050252712A1 (en) * | 2004-04-30 | 2005-11-17 | David Gau | Repositionable attenuator |
US20050274568A1 (en) * | 2004-06-11 | 2005-12-15 | Falco Robert N | High sound attenuating hearing protection device |
US7510046B2 (en) * | 2005-10-10 | 2009-03-31 | Cabot Safety Intermediate Corporation | Low attenuating push-in earplug with integral handle |
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US20090283358A1 (en) * | 2008-05-15 | 2009-11-19 | Hughey Christopher | Sound-reducing baffle |
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GB2500211A (en) * | 2012-03-13 | 2013-09-18 | Graeme Craib | Removable Exhaust Baffle Insert Silencer |
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US8002080B1 (en) | 2011-08-23 |
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