EP1740802A1 - Spark catcher for a muffler - Google Patents
Spark catcher for a mufflerInfo
- Publication number
- EP1740802A1 EP1740802A1 EP05722276A EP05722276A EP1740802A1 EP 1740802 A1 EP1740802 A1 EP 1740802A1 EP 05722276 A EP05722276 A EP 05722276A EP 05722276 A EP05722276 A EP 05722276A EP 1740802 A1 EP1740802 A1 EP 1740802A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spark catcher
- muffler
- net
- exhaust outlet
- 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.)
- Withdrawn
Links
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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/06—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for extinguishing sparks
-
- 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
- F01N2230/00—Combination of silencers and other devices
- F01N2230/06—Spark arresters
Definitions
- This invention relates to a spark catcher arrangement for a muffler comprising a muffler shell and an exhaust outlet cover that is fixed to one another in such a manner that a pocket is created between the shell and the exhaust conduit, said pocket being provided with a spark catcher net.
- spark catcher arrangements to prevent sparks from entering the air outside the muffler in order to prevent for instance forest fires when using combustion engines on chain saws.
- Conventional mufflers usually comprise an exhaust outlet conduit that by means of spot welding or other suitable means is fixed to the shell of the muffler.
- the joint between the outlet conduit and the shell also comprises one or several screws by means of which a spark catching net can be clamped in a pocket between the conduit and the shell.
- spark catcher nets that are fixed directly to the muffler buy screw joints but this arrangement is rather complicated since it means that several component have to be used (net, additional screw, and some kind of weld nut or press nut).
- These types of fastening arrangements also exist without a nut but such arrangements have the disadvantage that the net is easily damaged as well as the thread the thread is shaped directly in the shell of the muffler.
- the purpose of this invention is to achieve a spark catcher arrangement that is simple to remove without the use of tools in order to clean it or to exchange it.
- FIG. 1 shows the shell 10 of a muffler for a two-stroke combustion engine which is used on hand held tools such as chains saws and bush trimmers.
- the muffler is provided with an outlet opening 11 that at least partly is covered by an exhaust outlet cover 12 generally being shaped as a flat part 13 with an U-shaped middle section 14 that is open at one end and together with the shell of the muffler constitutes a pocket in which a spark catcher plate 15 can be inserted.
- the flat part 13 is in a suitable way for instance by spot weldings 16 fastened to the muffler shell 10.
- the middle section 14 is provided with an outwardly extending hood 17 that overlaps the outlet opening 1 1 of the muffler and that is provided with an opening 18 through which the exhaust gases flow out.
- the outer end of the middle section 14 has a collar portion 19 that is provided with an elongated opening 20.
- the spark catcher plate 15 comprises a rectangular net 21 having a comparatively stiff structure and is secured to a handle 22 by means of spot welding or any other suitable means.
- the handle 22 comprises a sheet metal that is folded and in which the net is inserted.
- the handle 22 is provided with a resilient tongue 23 that is an integrated part of the sheet metal and has an elongated ridge 24 arranged parallel to the opening 20 of the collar portion 19. The inner edge of the ridge 24 constitutes a slanted surface 25.
- the snap fastening arrangement described above operates in the following manner.
- the spark catcher plate 15 is normally fully inserted in to the pocket between the muffler shell 10 and the exhaust conduit 12 such that the net 21 covers the outlet opening 11 of the muffler shell thereby preventing sparks from following the exhaust gases through the opening 18 of the hood 17.
- the handle 22 is inserted into the collar portion 19 and the ridge 24 extends into the opening 20 which means that the spark catcher plate 15 is fixed to the shell of the muffler.
- the outer part of the resilient tongue 23 extends outside the edge of the collar 19.
- the spark catcher plate 15 can then again be inserted into the pocket which means that the slanted surface 25 of the ridge 24 will depress the resilient tongue 23 that will return to its original position when the ridge 24 reaches the opening 18 such that the spark catcher plate is again fixed to the muffler.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Silencers (AREA)
Abstract
This invention relates to a spark catcher arrangement for a muffler comprising a muffler shell (10) and an exhaust outlet cover (12) that are fixed to one another in such a manner that a pocket is created between the muffler shell and the exhaust outlet cover. A spark catcher net (21) is inserted in the pocket and said net is kept in the pocket by means of a snap fastening means (20, 23).
Description
Spark catcher for a muffler
This invention relates to a spark catcher arrangement for a muffler comprising a muffler shell and an exhaust outlet cover that is fixed to one another in such a manner that a pocket is created between the shell and the exhaust conduit, said pocket being provided with a spark catcher net. It is previously known to use spark catcher arrangements to prevent sparks from entering the air outside the muffler in order to prevent for instance forest fires when using combustion engines on chain saws. Conventional mufflers usually comprise an exhaust outlet conduit that by means of spot welding or other suitable means is fixed to the shell of the muffler. The joint between the outlet conduit and the shell also comprises one or several screws by means of which a spark catching net can be clamped in a pocket between the conduit and the shell. However, this means that it becomes cumbersome and time consuming to clean or change the net since one or several of the screws of the muffler have to be taken away before the net can be removed.. It is also previously known to use spark catcher nets that are fixed directly to the muffler buy screw joints but this arrangement is rather complicated since it means that several component have to be used (net, additional screw, and some kind of weld nut or press nut). These types of fastening arrangements also exist without a nut but such arrangements have the disadvantage that the net is easily damaged as well as the thread the thread is shaped directly in the shell of the muffler. The purpose of this invention is to achieve a spark catcher arrangement that is simple to remove without the use of tools in order to clean it or to exchange it. This is achieved by means of a device having the characteristics mentioned in the claims. An embodiment of the invention will now be described with reference to the accompanying drawing showing a perspective view of the spark catcher arrangement. The figure shows the shell 10 of a muffler for a two-stroke combustion engine which is used on hand held tools such as chains saws and bush trimmers. The muffler is provided with an outlet opening 11 that at least partly is covered by an exhaust outlet cover 12 generally being shaped as a flat part 13 with an U-shaped middle section 14 that is open at one end and together with the shell of the muffler constitutes a pocket in which a spark catcher plate 15 can be inserted. The flat part 13 is in a suitable way for instance by spot weldings 16 fastened to the muffler shell 10. The middle section 14 is
provided with an outwardly extending hood 17 that overlaps the outlet opening 1 1 of the muffler and that is provided with an opening 18 through which the exhaust gases flow out. The outer end of the middle section 14 has a collar portion 19 that is provided with an elongated opening 20. The spark catcher plate 15 comprises a rectangular net 21 having a comparatively stiff structure and is secured to a handle 22 by means of spot welding or any other suitable means. The handle 22 comprises a sheet metal that is folded and in which the net is inserted. The handle 22 is provided with a resilient tongue 23 that is an integrated part of the sheet metal and has an elongated ridge 24 arranged parallel to the opening 20 of the collar portion 19. The inner edge of the ridge 24 constitutes a slanted surface 25. The snap fastening arrangement described above operates in the following manner. The spark catcher plate 15 is normally fully inserted in to the pocket between the muffler shell 10 and the exhaust conduit 12 such that the net 21 covers the outlet opening 11 of the muffler shell thereby preventing sparks from following the exhaust gases through the opening 18 of the hood 17. In this position the handle 22 is inserted into the collar portion 19 and the ridge 24 extends into the opening 20 which means that the spark catcher plate 15 is fixed to the shell of the muffler. Simultaneously the outer part of the resilient tongue 23 extends outside the edge of the collar 19. By depressing the resilient tongue 23 the spark catcher plate can easily be drawn out from the pocket and be removed from the shell 10 of the muffler in order to be cleaned or exchanged. The spark catcher plate 15can then again be inserted into the pocket which means that the slanted surface 25 of the ridge 24 will depress the resilient tongue 23 that will return to its original position when the ridge 24 reaches the opening 18 such that the spark catcher plate is again fixed to the muffler.
Claims
1. Spark catcher arrangement for a muffler comprising a muffler shell (10) and an exhaust outlet cover (12) that are fixed to one another in such a manner that a pocket is created between the muffler shell and the exhaust outlet cover said pocket receiving a spark catcher net (21) characterized in that said net is kept in the pocket by means of a snap fastening means (20,23).
2. Spark catcher arrangement according to claim 1 characterized in that the net (21) is connected to a sheet metal handle (22) that is provided with a resilient tongue (23) arranged to interact with an opening (20) of the exhaust outlet cover (12).
3. Spark catcher arrangement according to claim 1 or 2 characterized in that the exhaust outlet cover (12) comprises a plate shaped part (13) having a hood shaped portion (17) with an outlet for exhaust gases.
4. Spark catcher arrangement according to claim 3 characterized in that the plate shaped part (13) is provided with a collar portion (19) arranged to receive at least a part of the handle (22).
5. Spark catcher arrangement according to claim 4 characterized in that the collar portion (19) is provided with the opening (20) for said tongue (23).
6. Spark catcher arrangement according to claim 2 characterized in that the net (21) is welded to the handle (22).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0400903A SE0400903D0 (en) | 2004-04-02 | 2004-04-02 | Kick catcher for a muffler |
PCT/SE2005/000449 WO2005095766A1 (en) | 2004-04-02 | 2005-03-24 | Spark catcher for a muffler |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1740802A1 true EP1740802A1 (en) | 2007-01-10 |
Family
ID=32173680
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05722276A Withdrawn EP1740802A1 (en) | 2004-04-02 | 2005-03-24 | Spark catcher for a muffler |
Country Status (6)
Country | Link |
---|---|
US (1) | US20070221441A1 (en) |
EP (1) | EP1740802A1 (en) |
JP (1) | JP2007530868A (en) |
CN (1) | CN100455776C (en) |
SE (1) | SE0400903D0 (en) |
WO (1) | WO2005095766A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019157761A (en) * | 2018-03-13 | 2019-09-19 | 本田技研工業株式会社 | Exhaust device with spark arrester |
DE102018122042A1 (en) * | 2018-09-10 | 2020-03-12 | Faurecia Emissions Control Technologies, Germany Gmbh | Component of an exhaust system and method for producing such a component |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2725899A1 (en) * | 1977-06-08 | 1978-12-21 | Stihl Maschf Andreas | EXHAUST SILENCER |
CN2087240U (en) * | 1991-05-18 | 1991-10-23 | 上海市化工物品汽车运输公司 | Exhaust and extinguishing spark apparatus for automobile |
JP2504053Y2 (en) * | 1992-03-27 | 1996-07-03 | 株式会社丸山製作所 | Exhaust silencer |
US5451728A (en) * | 1992-11-19 | 1995-09-19 | Wci Outdoor Products, Inc. | Muffler for two-cycle internal combustion engine and method of assembly |
US5295602A (en) * | 1993-03-17 | 1994-03-22 | General Motors Corporation | Housing with snap latch closure |
US5577779A (en) * | 1994-12-22 | 1996-11-26 | Yazaki Corporation | Snap fit lock with release feature |
AU4736396A (en) * | 1995-02-14 | 1996-09-04 | Aktiebolaget Electrolux | Spark arresting structure |
JP3816581B2 (en) * | 1996-06-21 | 2006-08-30 | 株式会社共立 | Muffler for internal combustion engine |
US5743606A (en) * | 1996-08-16 | 1998-04-28 | Dell U.S.A., L.P. | Computer cabinet latching mechanism |
JP3738927B2 (en) * | 1997-06-23 | 2006-01-25 | 本田技研工業株式会社 | Muffler spark arrester equipment |
DE19747914A1 (en) * | 1997-10-30 | 1999-05-06 | Stihl Maschf Andreas | Exhaust gas silencer for two-stroke internal combustion engine |
JP3290394B2 (en) * | 1997-11-19 | 2002-06-10 | 富士ロビン株式会社 | Muffler with spark arrester |
JPH11324669A (en) * | 1998-05-20 | 1999-11-26 | Maruyama Mfg Co Ltd | Spark arrester and its manufacture |
JP2001050032A (en) * | 1999-08-09 | 2001-02-23 | Global Patent Network:Kk | Spark arrester provided with exhaust emission acceleration function |
AU2003284386A1 (en) * | 2002-10-31 | 2004-06-07 | White Brothers Performance Products, Inc. | Muffler with spark arrestor |
-
2004
- 2004-04-02 SE SE0400903A patent/SE0400903D0/en unknown
-
2005
- 2005-03-24 JP JP2007506109A patent/JP2007530868A/en active Pending
- 2005-03-24 WO PCT/SE2005/000449 patent/WO2005095766A1/en active Application Filing
- 2005-03-24 US US10/593,522 patent/US20070221441A1/en not_active Abandoned
- 2005-03-24 CN CNB2005800100117A patent/CN100455776C/en not_active Expired - Fee Related
- 2005-03-24 EP EP05722276A patent/EP1740802A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2005095766A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2005095766A1 (en) | 2005-10-13 |
CN1985079A (en) | 2007-06-20 |
CN100455776C (en) | 2009-01-28 |
SE0400903D0 (en) | 2004-04-02 |
US20070221441A1 (en) | 2007-09-27 |
JP2007530868A (en) | 2007-11-01 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 20061020 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR |
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DAX | Request for extension of the european patent (deleted) | ||
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
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18W | Application withdrawn |
Effective date: 20091203 |