US3132716A - Muffler - Google Patents

Muffler Download PDF

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Publication number
US3132716A
US3132716A US182915A US18291562A US3132716A US 3132716 A US3132716 A US 3132716A US 182915 A US182915 A US 182915A US 18291562 A US18291562 A US 18291562A US 3132716 A US3132716 A US 3132716A
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United States
Prior art keywords
spring
opening
muffler
cylinder
groove
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Expired - Lifetime
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US182915A
Inventor
Cole C Williams
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L M COX Manufacturing CO Inc
Aeromil Engineering Co Inc
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L M COX Manufacturing CO Inc
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Publication date
Application filed by L M COX Manufacturing CO Inc filed Critical L M COX Manufacturing CO Inc
Priority to US182915A priority Critical patent/US3132716A/en
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Publication of US3132716A publication Critical patent/US3132716A/en
Anticipated expiration legal-status Critical
Assigned to AEROMIL ENGINEERING CO., INC., A CA CORP. reassignment AEROMIL ENGINEERING CO., INC., A CA CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: COX HOBBIES INC.
Expired - Lifetime legal-status Critical Current

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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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1861—Construction facilitating manufacture, assembly, or disassembly the assembly using parts formed by casting or moulding
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63H—TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
    • A63H27/00—Toy aircraft; Other flying toys
    • A63H27/02—Model aircraft
    • 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
    • F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
    • F01N1/165—Silencing apparatus characterised by method of silencing by using movable parts for adjusting flow area
    • 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
    • F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
    • F01N1/22—Silencing apparatus characterised by method of silencing by using movable parts the parts being resilient walls
    • 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
    • F01N13/1838—Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
    • F01N13/1844—Mechanical joints
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/34—Ultra-small engines, e.g. for driving models
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/02—Exhaust treating devices having provisions not otherwise provided for for cooling the device
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/28—Tubes being formed by moulding or casting x
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S181/00—Acoustics
    • Y10S181/404—Hobby craft engine muffler

Definitions

  • This invention relates to a muffler and more particularly to a mufiier for engines of the type used in model aircraft, boats and cars designated as .049 reed valve engines. Such models have become popular, but the loud, staccato noise is objectionable and has caused restrictive ordinances to be enacted by some communities.
  • the device is extremely simple, consisting of only three parts, and is very easy to install on existing engines.
  • FIGURE 1 is a side view of the front end of a model airplane with the muffler of this invention installed;
  • FIGURE 2 is an enlarged view taken on section line 2-2 of FIGURE 1; 9
  • FIGURE 3 is a section taken along line 3-3 of FIG- URE 2;
  • FIGURE 4 is an exploded perspective elevation of the mufiler pants.
  • FIGURES is a view similar to FIGURE 2 showing the mufiler top reversed.
  • FIGURE 1 the nose of an aircraft mounted with an .049 engine 10, a propeller 11 and a coil spring starter 12.
  • the starter is of the type shown in De Groat Patent No. 2,751,898, and is optional, but as stated hereinafter influences the orientation of the mufller top.
  • the muffler as best shown in FIGURE 4, consists of a mufiler housing 13, a mufiler top 14 and a muffler spring 15.
  • the muffler housing 13 comprises a casting 16 having a hexagonal extension 17 with cylindrical bore 18.
  • the casting 16 has an external annular groove 19 which groove is relieved to permit an arcuate slot 20 communicating with the interior of the casting 16 which is an enlarged, as compared to the bore 18, cylindrical bore 21.
  • the bottom of the annular groove is knurled with a plurality of spaced knurls 22.
  • the top of casting 16 is provided with a re-entr-ant enlarged bore to provide a shoulder 23 forming a seat for the mufiler top 14.
  • Top 14 is a thin disc having a cylindrical central extension 24 with a circular opening 25 therein.
  • Spring 15 is formed of flat thin plate bent into a major segment of a cylinder leaving an open space 26 and having one end bent outward to form a tab or handle 27.
  • a detent 28 is formed near the end of spring 15, as shown, by indenting the spring at that point.
  • the mechanism of this invention comprises the parts shown in FIGURE 4 when used with the model engine shown in the remaining views which disclose an existing .049 model engine.
  • the engine is disassembled by removing the cylinder 30 from the engine, installing housing 16 on cylinder boss 31, orienting the opening 26 in an up position on engines having cylinclers mounted sideways to allow ease of engine priming.
  • Muffler top 14 is seated on shoulder 23 with extension 24 either upward or downward.
  • the cylinder 30 is then reinstalled so that mufilertop 14 isseated oncooling fin 32, being the second cooling fin from the bottom of the cylinder.
  • Spring 15 is then installed in annular groove 19 and the assembly is completed.
  • FIGURE 1 if a De Groat starter 12 is used, one end thereof will be seated as shown in FIG- URE l, and the extension 24 of top 14 will extend down into housing 13 as shown in FIGURE 2. If no starter is used the top 14 will be inverted as shown in FIG- URE 5.
  • a mufller for a model engine having an open exhaust port comprising: a mufiler housing adapted to surround said port; said housing having an annular groove on its exterior and an opening in said housing adapted to align with said port; a flexible spring seated in said groove, said spring being in the form of a major segment of a cylinder with an outwardly extending tab; said spring providing a gap forming the minor segment of said cylinder and being movable in said groove to align said gap with said opening or to cover said opening as desired.
  • a muffler for a model engine having an open exhaust port comprising: a mufiler housing adapted to surround said port; said housing having an annular groove on its exterior and an opening in said housing adapted to align with said ports; a flexible spring seated in said groove, said spring being in the form of a major segment of a cylinder with an outwardly extending tab; said spring providing a gap forming the minor segment of said cylinder and being movable in said groove to align said gap with said opening or to cover said opening as desired; said annular groove being knurled and said spring having a detent selectively engageable in the knurls.
  • a muffler for a model engine having an open exhaust port comprising: a muffler housing adapted to surround said port; said housing having an annular groove on its exterior and an opening in said housing adapted to align with said port; a flexible spring seated in said groove, said spring being in the form of a major segment of a cylinder with an outwardly extending tab; said spring providing a gap forming the minor segment of said cylinder and being movable said groove to align said gap with said opening or to cover said opening as desired; said mufiler having a top removably seated thereon and having a cylindrical extension, said extension being arranged to extend into or outwardly of said housing as desired.
  • a mufller for a model engine having an open exhaust port comprising: a mufller housing adapted to surround said port; said housing having an annular groove on its exterior and an opening in said housing adapted to align with said port; a flexible spring seated in said groove, said spring being in the form of a major segment of a cylinder with an outwardly extending :tab; saidspring providing a gap forming the minor segment of said cylinder and being movable in said groove to align said gap with said opening or to cover said opening as desired; said annular groove being knurled and said spring having a detent selectively engageable in the knurls; said muffler having a top removably seated thereon and having a cylindrical extension, said extension being arranged to extend. into or outwardly of said housing as desired.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Description

y 1964 c. c. WILLIAMS 3,132,716
MUFFLER Filed March 27, 1962 INVENTOR,
United States Patent Ofiice 3,132,716 Patented. May 12, 1964 MUFFLER Cole C. Williams, Santa Ana, Calif., assignor to L. M.
Cox Manufacturing Co., Inc, Santa Ana, Calif., a corporation of California Filed Mar. 27, 1962, Ser. No. 182,915 4 Claims. (Cl. 181-40) This invention relates to a muffler and more particularly to a mufiier for engines of the type used in model aircraft, boats and cars designated as .049 reed valve engines. Such models have become popular, but the loud, staccato noise is objectionable and has caused restrictive ordinances to be enacted by some communities.
It is therefore the primary object of this invention to reduce the noise of such model engines and overcome the objections thereto.
It is a further object of this invention to accomplish the primary object with a minimum loss of power.
It is a feature of this invention that the device is extremely simple, consisting of only three parts, and is very easy to install on existing engines.
These and other objects, features and advantages will be apparent from the annexed specification, in which:
FIGURE 1 is a side view of the front end of a model airplane with the muffler of this invention installed;
FIGURE 2 is an enlarged view taken on section line 2-2 of FIGURE 1; 9
FIGURE 3 is a section taken along line 3-3 of FIG- URE 2;
FIGURE 4 is an exploded perspective elevation of the mufiler pants; and
FIGURES is a view similar to FIGURE 2 showing the mufiler top reversed.
Referring now more particularly to the drawings, there is shown in FIGURE 1 the nose of an aircraft mounted with an .049 engine 10, a propeller 11 and a coil spring starter 12. The starter is of the type shown in De Groat Patent No. 2,751,898, and is optional, but as stated hereinafter influences the orientation of the mufller top.
The muffler, as best shown in FIGURE 4, consists of a mufiler housing 13, a mufiler top 14 and a muffler spring 15.
The muffler housing 13 comprises a casting 16 having a hexagonal extension 17 with cylindrical bore 18. The casting 16 has an external annular groove 19 which groove is relieved to permit an arcuate slot 20 communicating with the interior of the casting 16 which is an enlarged, as compared to the bore 18, cylindrical bore 21. The bottom of the annular groove is knurled with a plurality of spaced knurls 22.
The top of casting 16 is provided with a re-entr-ant enlarged bore to provide a shoulder 23 forming a seat for the mufiler top 14.
Top 14 is a thin disc having a cylindrical central extension 24 with a circular opening 25 therein.
Spring 15 is formed of flat thin plate bent into a major segment of a cylinder leaving an open space 26 and having one end bent outward to form a tab or handle 27. A detent 28 is formed near the end of spring 15, as shown, by indenting the spring at that point.
The mechanism of this invention comprises the parts shown in FIGURE 4 when used with the model engine shown in the remaining views which disclose an existing .049 model engine.
To install the mulller on the engine the engine is disassembled by removing the cylinder 30 from the engine, installing housing 16 on cylinder boss 31, orienting the opening 26 in an up position on engines having cylinclers mounted sideways to allow ease of engine priming. Muffler top 14 is seated on shoulder 23 with extension 24 either upward or downward. The cylinder 30 is then reinstalled so that mufilertop 14 isseated oncooling fin 32, being the second cooling fin from the bottom of the cylinder. Spring 15 is then installed in annular groove 19 and the assembly is completed. 1
The operation of the above-described device is as follows. To start the engine, spring 15 is rotated in groove 19 to align opening 26 with one of the exhaust ports 40 of the engine to permit priming. The engine is then started and spring 15 is then moved to close the slot 20 for complete mufiling effect or to partially close the same, as desired. Detent 28 acting in knurls 22 will hold the spring as set. Spring 15, being flexible, will expand under pressure of exhaust from the engine to spend the exhaust fumes, but will efiectively muffle the sound, without however, unduly reducing the etficiency of the engine.
As shown in FIGURE 1, if a De Groat starter 12 is used, one end thereof will be seated as shown in FIG- URE l, and the extension 24 of top 14 will extend down into housing 13 as shown in FIGURE 2. If no starter is used the top 14 will be inverted as shown in FIG- URE 5.
While there has been described what is at present considered a preferred embodiment of the present invention, it will be appreciated by those skilled in the art that various changes and modifications can be made therein without departing from the essence of the invention and it is intended to cover herein all such changes and modifications as come Within the true spirit and scope of the appended claims.
I claim:
1. A mufller for a model engine having an open exhaust port comprising: a mufiler housing adapted to surround said port; said housing having an annular groove on its exterior and an opening in said housing adapted to align with said port; a flexible spring seated in said groove, said spring being in the form of a major segment of a cylinder with an outwardly extending tab; said spring providing a gap forming the minor segment of said cylinder and being movable in said groove to align said gap with said opening or to cover said opening as desired.
2. A muffler for a model engine having an open exhaust port comprising: a mufiler housing adapted to surround said port; said housing having an annular groove on its exterior and an opening in said housing adapted to align with said ports; a flexible spring seated in said groove, said spring being in the form of a major segment of a cylinder with an outwardly extending tab; said spring providing a gap forming the minor segment of said cylinder and being movable in said groove to align said gap with said opening or to cover said opening as desired; said annular groove being knurled and said spring having a detent selectively engageable in the knurls.
3. A muffler for a model engine having an open exhaust port comprising: a muffler housing adapted to surround said port; said housing having an annular groove on its exterior and an opening in said housing adapted to align with said port; a flexible spring seated in said groove, said spring being in the form of a major segment of a cylinder with an outwardly extending tab; said spring providing a gap forming the minor segment of said cylinder and being movable said groove to align said gap with said opening or to cover said opening as desired; said mufiler having a top removably seated thereon and having a cylindrical extension, said extension being arranged to extend into or outwardly of said housing as desired.
4. A mufller for a model engine having an open exhaust port comprising: a mufller housing adapted to surround said port; said housing having an annular groove on its exterior and an opening in said housing adapted to align with said port; a flexible spring seated in said groove, said spring being in the form of a major segment of a cylinder with an outwardly extending :tab; saidspring providing a gap forming the minor segment of said cylinder and being movable in said groove to align said gap with said opening or to cover said opening as desired; said annular groove being knurled and said spring having a detent selectively engageable in the knurls; said muffler having a top removably seated thereon and having a cylindrical extension, said extension being arranged to extend. into or outwardly of said housing as desired.
References Cited in the file of this patent UNITED STATES PATENTS

Claims (1)

1. A MUFFLER FOR A MODEL ENGINE HAVING AN OPEN EXHAUST PORT COMPRISING: A MUFFLER HOUSING ADAPTED TO SURROUND SAID PORT; SAID HOUSING HAVING AN ANNULAR GROOVE ON ITS EXTERIOR AND AN OPENING IN SAID HOUSING ADAPTED TO ALIGN WITH SAID PORT; A FLEXIBLE SPRING SEATED IN SAID GROOVE, SAID SPRING BEING IN THE FORM OF A MAJOR SEGMENT OF A CYLINDER WITH AN OUTWARDLY EXTENDING TAB; SAID SPRING PROVIDING A GAP FORMING THE MINOR SEGMENT OF SAID CYLINDER AND BEING MOVABLE IN SAID GROOVE TO ALIGN SAID GAP WITH SAID OPENING OR TO COVER SAID OPENING AS DESIRED.
US182915A 1962-03-27 1962-03-27 Muffler Expired - Lifetime US3132716A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3318412A (en) * 1966-03-17 1967-05-09 Mcculloch Corp Muffler with reed valve
US3643759A (en) * 1970-12-28 1972-02-22 Mcculloch Corp Muffler with reed valve providing continuous venting
US3894611A (en) * 1974-02-22 1975-07-15 Jr Charles J Raudman Muffler
US4042062A (en) * 1976-03-01 1977-08-16 Chicago Pneumatic Tool Company Air pulse noise damper for a pneumatic tool
FR2406720A1 (en) * 1977-10-18 1979-05-18 Globe Outils Pneumatiques Silencer for pneumatic motor for small tools - has expansion volume enclosed by elastic wall which vary opening according to pressure
US20050161282A1 (en) * 2002-10-24 2005-07-28 Sageman Robert J. Flapper finger valve

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2089262A (en) * 1935-05-29 1937-08-10 Nat Radiator Corp Relief device for combustion chambers
US2937708A (en) * 1958-03-20 1960-05-24 Jr Francis M Cottle Sound deadening device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2089262A (en) * 1935-05-29 1937-08-10 Nat Radiator Corp Relief device for combustion chambers
US2937708A (en) * 1958-03-20 1960-05-24 Jr Francis M Cottle Sound deadening device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3318412A (en) * 1966-03-17 1967-05-09 Mcculloch Corp Muffler with reed valve
US3643759A (en) * 1970-12-28 1972-02-22 Mcculloch Corp Muffler with reed valve providing continuous venting
US3894611A (en) * 1974-02-22 1975-07-15 Jr Charles J Raudman Muffler
US4042062A (en) * 1976-03-01 1977-08-16 Chicago Pneumatic Tool Company Air pulse noise damper for a pneumatic tool
FR2342825A1 (en) * 1976-03-01 1977-09-30 Chicago Pneumatic Tool Co PNEUMATIC TOOL INCLUDING A DAMPER FOR THE SOUNDS PRODUCED BY THE EXHAUST AIR
FR2406720A1 (en) * 1977-10-18 1979-05-18 Globe Outils Pneumatiques Silencer for pneumatic motor for small tools - has expansion volume enclosed by elastic wall which vary opening according to pressure
US20050161282A1 (en) * 2002-10-24 2005-07-28 Sageman Robert J. Flapper finger valve
US7240768B2 (en) * 2002-10-24 2007-07-10 Barnes Group Inc. Flapper finger valve

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AS Assignment

Owner name: AEROMIL ENGINEERING CO., INC., 1409 EAST ST. GERTR

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:COX HOBBIES INC.;REEL/FRAME:004901/0591

Effective date: 19831130

Owner name: AEROMIL ENGINEERING CO., INC., A CA CORP.,CALIFORN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:COX HOBBIES INC.;REEL/FRAME:004901/0591

Effective date: 19831130