US3618906A - Device and process for limiting idling fuel in carburetors - Google Patents

Device and process for limiting idling fuel in carburetors Download PDF

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Publication number
US3618906A
US3618906A US3618906DA US3618906A US 3618906 A US3618906 A US 3618906A US 3618906D A US3618906D A US 3618906DA US 3618906 A US3618906 A US 3618906A
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Prior art keywords
cap
head
idling
needle
fuel
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Expired - Lifetime
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William W Charron
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Ford Motor Co
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Ford Motor Co
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS, WEDGES, JOINTS OR JOINTING
    • F16B41/00Measures against loss of bolts, nuts, or pins; Measures against unauthorised operation of bolts, nuts or pins
    • F16B41/005Measures against unauthorised operation of bolts, nuts or pins
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M3/00Idling devices for carburettors
    • F02M3/08Other details of idling devices
    • F02M3/10Fuel metering pins; Nozzles
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16BDEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS, WEDGES, JOINTS OR JOINTING
    • F16B39/00Locking of screws, bolts or nuts
    • F16B39/02Locking of screws, bolts or nuts in which the locking takes place after screwing down
    • F16B39/10Locking of screws, bolts or nuts in which the locking takes place after screwing down by a plate, spring, wire or ring immovable with regard to the bolt or object and mainly perpendicular to the axis of the bolt
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M3/00Idling devices for carburettors
    • F02M3/08Other details of idling devices
    • F02M3/10Fuel metering pins; Nozzles
    • F02M2003/105Needle adjustment limiter caps
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S261/00Gas and liquid contact apparatus
    • Y10S261/38Needle valves
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S261/00Gas and liquid contact apparatus
    • Y10S261/84Tamperproof
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/6851With casing, support, protector or static constructional installations
    • Y10T137/7043Guards and shields
    • Y10T137/7062Valve guards
    • Y10T137/7065With means for accommodating a detachable actuator
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00Fluid handling
    • Y10T137/7069With lock or seal
    • Y10T137/7256Locks against rotary motion

Abstract

A polyamide cap fits tightly over the head of the idling needle and a vane on the cap abuts a boss on the carburetor body to prevent needle rotation in one direction. Internal teeth of the cap fit over the idling needle head to prevent separating the cap from the needle, while lands on the interior of the cap permit easy installation. The cap is installed during carburetor flow testing with the idling needle in the position producing the maximum allowable amount of fuel flow through the idling passages and with the vane contacting a boss on the side preventing further increases in the amount of idling fuel. A decrease in idling fuel can be effected by rotating the cap and needle in the direction moving the vane away from the boss for almost one full turn.

Description

United States Patent [72] inventor William W. Charron Livonia, Mich.

[211 AppLNo. 661,570

[22] Filed Aug. 18, 1967 [45] Patented Nov. 9, 1971 [73] Assignee Ford Motor Company Dearborn, Mich.

[54] DEVICE AND PROCESS FOR LIMITING IDLING 41.4, 66, 41, 71, DIG. 38; 29/447; 264/342; 137/385, 382, 382.5; 251/89, 92, 93,112,274, DIG. 4,115, 214, 20, 266, 291, 289; 239/366 [56] References Cited UNITED STATES PATENTS 1,801,396 4/1931 Thatchen 29/447 UX 1,872,786 8/1932 Mock eta1.. 261/41 (.4) 2,618,473 11/1952 Whitford.... 261/41(.4)' 2,858,570 11/1958 Richards 264/342 X 3,132,412 5/1964 Kneissig 264/342 X 3,166,292 l/l965 Forman 261/66 X 3,285,312 ll/1966 Dison et al 137/385 X 3,321,195 5/1967 Korte 261/41 (.4) 1,272,036 7/1908 Greuter 261/71 3,414,244 12/1968 Patterson, .lr. 261/41 2,551,117 5/1951 Gortner 287/53 H 2,544,111 3/1951 Schneebeli 261/71 X 2,590,217 3/1952 Snyder et a1. 261/71 X 2,816,573 12/1957 Kaddis et a1. 261/41 X 3,188,062 6/1965 Reid et a1 261/41 3,455,513 7/1969 Wyse 239/366 Primary Examiner-Ronald R. Weaver Attorneys-John R. Faulkner and Glenn S. Arendsen ABSTRACT: A polyamide cap fits tightly over the head of the idling needle and a vane on the cap abuts a boss on the carburetor body to prevent needle rotation in one direction. internal teeth of the cap fit over the idling needle head to prevent separating the cap from the needle, while lands on the interior of the cap permit easy installation. The cap is installed during carburetor flow testing with the idling needle in the position producing the maximum allowable amount of fuel flow through the idling passages and with the vane contacting a boss on the side preventing further increases in the amount of idling fuel. A decrease in idling fuel can be effected by rotating the cap and needle in the direction moving the vane away from the boss for almost one full turn.

PATENTEDNUV 9 I97! W/LL/AM W C/MRRON INVENTO a. I flaw JMW ATTORNEYS DEVICE AND PROCESS FOR LIMITING IDLING FUEL IN CARBURETORS SUMMARY OF THE INVENTION Recently adopted exhaust emission standards specify the maximum proportions of unburned hydrocarbons and certain other compounds in the exhaust gases of internal combustion engines. The amount of fuel supplied to an engine through the idling passages afi'ects directly the amount of undesirable exhaust emissions during engine idling. With proper calibration of the idling system during carburetor assembly, most emission standards can be met; however, an increase in the amount of idling fuel during subsequent engine or vehicle assembly operations or by field service personnel could increase the undesirable emission beyond the standards.

In the past, setscrews have been used to lock the idling control needle in a certain position Of course, the setscrews can be loosened to permit a change and then retightened with the change being impossible to detect without another calibration or an exhaust gas sampling. Furthermore, the setscrews must be loosened and retightened whenever the amount of idling fuel is adjusted for changes in engine requirements necessitated by varying climate, weather, ground elevation, or engine conditions.

The idling fuel limiting device provided by this invention does not interfere with minor adjustments to the idling fuel system while providing positive evidence of unauthorized tampering with the idling needle to increase the amount of idling fuel beyond the calibrated amount. In a device for metering fuel to an internal combustion engine that has a rotatable member for increasing and decreasing the amount of idling fuel, the limiter comprises a cap made of a hard but deformahle material fitting on the head of the rotatable member so the cap is nonrotatable relative thereto. A projecting vane is formed on the exterior of the cap where it contacts a rigid portion of the body when rotation of the member in the direction increasing the amount ofidling fuel is attempted.

Preferably the cap contains internal teeth fitting over the head of the threaded member, the idling needle in most conventional carburetors, with a force sufficient to prevent integral removal of the cap. Lands are formed on the interior of the cap to guide the cap on the head during installation.

The cap is installed after carburetor assembly while the carburetor is being flow tested. Just prior to cap installation, the idling needle is backed out to the position where the amount of idling -fuel is predetermined maximum providing engine compliance with the emission legislation. The cap then is pressed on the head of the idling needle with the vane on the cap abutting projection from the carburetor body on the side preventing further increases in the amount of idling fuel.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is an exploded view ofa cap and needle with a portion of the cap sectioned to show the internal teeth and lands. FIG. 2 is a sectioned elevation of a portion of a carburetor showing the cap installed on an idling needle with the needle installed in the carburetor body.

DETAILED DESCRIPTION Referring to FIG. 1, the cap represented by the numeral has a vane 12 formed on the exterior surface. Cap 10 preferably is made of polymeric material capable of surviving in the underhood compartment of a vehicle. Polyamides are desirable cap materials because soakingthe polyamide cap in water softens it to ease assembly. After assembly, the polyamide cap dries to become sufficiently tough toinhibit removal and sufficiently brittle to spit instead of yielding to a determined removal procedure. The interior of the cap contains four tapered lands, one of which is represented by numeral 14, evenly spaced and alternating with four inwardly projecting teeth, two of which are represented'by numerals 16 and 18. The inner surfaces of the teeth define a substantially radial plane while the outer surfaces taper to the interior wall of the cap. Cross slots 20 and 22 for receiving a screwdriver blade are molded in the closed end of cap 10.

Numeral 24 designates the carburetor idling needle. Needle 24 has a tapered point 26, a threaded body 28, and an enlarged head '30. A plurality of closely spaced axial slots 32 are cut into the cylindrical surface of head 30. The surface of head 30 facing body 28 is a'substantially radial plane. A radial slot 34 for receiving a screwdriver blade is formed in the outer radial surface of head 30.

Turning to FIG. 2, a carburetor 36 contains an induction passage 38 with a throttle blade 40 mounted therein. An idling fuel passage 42 is connected to a fuel source (not shown) and communicates through a port 44 with the induction passage 38 posterior to throttle blade 40. Idling needle 24 is threaded into a hole through the carburetor body coaxial with port 44. Cap 10 is pressed onto head 30 so teeth l6, 18, etc. pass over the cylindrical surface thereof and-snap into contact with the radial surface between the head and the body. Vane l2 abuts a projection 46 extending outward from the carburetor body.

During carburetor manufacturing, the carburetor is assembled completely except for installation of the cap on the idling needle. The carburetor is placed on a flow test stand and the idle needle is adjusted to provide the maximum amount of flow through the idling passage at which the engine ultimately using the carburetor will comply with exhaust emission standards. Then a polyamide cap, which has been soaked in water to soften it slightly, is pressed on the head of the idling needle with the vane abutting the boss on the side preventing further increases in the amount of fuel flow. For a needle having conventional right-hand threads, this abutment is on the right side of a boss located above the needle as shown in the drawing.

Lands 14 combine with the sloping outer surfaces of the teeth to guide the cap over the head of the idling screw until the teeth snap over the head into the position shown in FIG. 2. Once this occurs, the lands coact with the axial slots in the cylindrical surface of the needle head to inhibit relative rotation between the cap and the needle.

Needle 24 now can be rotated inward to reduce the amount of idling fuel but cannot be rotated outward to increase the idling fuel flow beyond the predetermined maximum. Lands l4 grip the cylindrical surface of head 30 tightly so there is not need to line up the slots 20 or 22 with slot 34 since the capneedle assemblycan be rotated either by hand or by inserting a screwdriver in the slots in the cap. It is preferable for lands 14 to interfere with head 30 sufficiently to remove cap material during or produce plastic deformation after installation. Other. useful polymeric cap materials include the phenolics, polyurethanes, polyacrylates, and the synthetic rubber materials.

During further carburetor processing the absorbed water in the polyamide cap material evaporates and the cap becomes relatively brittle. Any subsequent attempts to remove the cap generally result in splitting the cap along axial planes so the cap cannot be reinstalled. A visual inspection of the carburetor then readily reveals the tampering.

Thus, this invention provides an idle limiting device that is easily installed but cannot be removed without leaving clear evidence of tampering The device is useful carburetors of different types with the only requirement being an abutment for the vane. In many cases, an existing portion of the carburetor body can be used as the abutment; alternatively, a boss can be formed on the carburetor body specifically for this purpose as shown in the drawing. Installing the cap during flow testing insures adequate fuel flow despite tolerance variations in metering jets and other flow control components.

Iclaim: j

1. In a device having a body for metering fuel to an internal combustion engine and having a rotatable member for increasing the amount of idling fuel, an idling fuel limiter comprising a head formed on the rotatable member, said head being located just outside the body of said device, and

a cap made of a deformable material and movable onto said head, said cap fitting on the head so said cap is nonrotatable relative to the head, said cap containing internal teeth that deform to permit moving the cap over said head, said mitting rotation in the direction decreasing the amount of idling fuel.

2. The device of claim 1 comprising lands formed on the interior of the cap to guide the teeth over the head during instalteeth fitting over said head to prevent integral removal of 5 lation of the cap on the head the cap from the head, said cap having an exterior projecting vane located to prevent rotation of the member in the direction increasing the amount of idling fuel but per- 3. The device of claim 2 in which the cap is made of a polyamide.

i l l l i

Claims (3)

1. In a device having a body for metering fuel to an internal combustion engine and having a rotatable member for increasing the amount of idling fuel, an idling fuel limiter comprising a head formed on the rotatable member, said head being located just outside the body of said device, and a cap made of a deformable material and movable onto said head, said cap fitting on the head so said cap is nonrotatable relative to the head, said cap containing internal teeth that deform to permit moving the cap over said head, said teeth fitting over said head to prevent integral removal of the cap from the head, said cap having an exterior projecting vane located to prevent rotation of the member in the direction increasing the amount of idling fuel but permitting rotation in the direction decreasing the amount of idling fuel.
2. The device of claim 1 comprising lands formed on the interior of the cap to guide the teeth over the head during installation of the cap on the head.
3. The device of claim 2 in which the cap is made of a polyamide.
US3618906D 1967-08-18 1967-08-18 Device and process for limiting idling fuel in carburetors Expired - Lifetime US3618906A (en)

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Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5035540A (en) * 1973-03-01 1975-04-04
US4097561A (en) * 1976-04-23 1978-06-27 Nissan Motor Company, Limited Idle mixture adjusting device of carburetor
US4239710A (en) * 1978-03-03 1980-12-16 Aisan Industry Co., Ltd. Device for checking random adjustment of adjustable parts of carburetor
US4242290A (en) * 1979-07-30 1980-12-30 Ford Motor Company Carburetor idle mixture screw enclosure assembly
US4246929A (en) * 1978-02-13 1981-01-27 Colt Industries Operating Corp Tamper proof idle adjusting screws
US4271095A (en) * 1978-08-21 1981-06-02 Toyo Kogyo Co., Ltd. Idle adjusting device for a carburetor
US5046523A (en) * 1989-06-02 1991-09-10 George Horhota Lock core service valve
US5055238A (en) * 1989-06-30 1991-10-08 Shinagawa Diecast Industrial Corp. Diaphragm carburetor
US5236634A (en) * 1992-09-23 1993-08-17 Walbro Corporation Carburetor needle valve adjustment limiter cap and method of adjusting fuel flow
FR2689188A1 (en) * 1992-03-31 1993-10-01 Stihl Andreas Device opposing adjustments for an adjusting screw.
EP0589405A1 (en) * 1992-09-23 1994-03-30 Walbro Corporation Carburettor needle valve adjustment limiter cap
US5525267A (en) * 1993-04-30 1996-06-11 U.S.A. Zama, Inc. Tamper resistant limit cap
US5603869A (en) * 1994-10-19 1997-02-18 Wci Outdoor Products, Inc. Fuel mixture limitation device
US5630965A (en) * 1995-06-02 1997-05-20 U.S.A. Zama, Inc. Low force limit device
US5667734A (en) * 1995-05-19 1997-09-16 Walbro Corporation Carburetor with regulating valve limiting device
US5695693A (en) * 1994-09-13 1997-12-09 U.S.A. Zama, Inc. Carburetor fuel adjusting device
US5707561A (en) * 1996-07-18 1998-01-13 Walbro Corporation Tamper resistant carburetor needle valve adjustment limiter
US5753148A (en) * 1995-08-30 1998-05-19 Walbro Corporation Carburetor needle valve adjustment limiter cap apparatus and method of adjusting fuel flow
US5776379A (en) * 1996-03-26 1998-07-07 Barcarole Limited Carburetor adjustment screw apparatus
US5955007A (en) * 1994-09-13 1999-09-21 U.S.A. Zama Inc. Carburetor fuel adjusting device
US5984281A (en) * 1995-08-30 1999-11-16 Walbro Corporation Carburetor needle valve and limiter cap installation and adjustment apparatus
DE19833541A1 (en) * 1998-07-25 2000-01-27 Stihl Maschf Andreas Carburetor for internal combustion engine is portable, manually controlled work apparatus, such as motor chain saw, has suction channel in housing and fuel channel issuing into suction channel
US6302383B1 (en) * 2000-05-08 2001-10-16 Impco Technologies, Inc. Tamper resistant device for engine adjuster
US6467757B1 (en) * 1999-09-27 2002-10-22 Walbro Japan, Inc. Carburetor valve adjustment limiter cap assembly
US6491288B2 (en) * 2000-03-30 2002-12-10 Walbro Japan, Inc. Carburetor fuel mixture adjustment assembly
US6543752B2 (en) * 2000-09-06 2003-04-08 Andreas Stihl Ag & Co. Carburetor for an internal combustion engine and including at least one adjusting screw
US20040108605A1 (en) * 2002-12-10 2004-06-10 Gliniecki Gary U. Carburetor with plastic idle speed adjustment screw
US20120018908A1 (en) * 2010-07-24 2012-01-26 Walbro Engine Management, L.L.C. Carburetor valve adjustment limiter
US20120146250A1 (en) * 2010-12-08 2012-06-14 Andreas Stihl Ag & Co. Kg Adjustment Safeguard
CN107524546A (en) * 2016-06-16 2017-12-29 沃尔布罗有限责任公司 Feed forming apparatus with adjustable valve limiter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3005854C2 (en) * 1980-02-16 1990-06-13 Fa. Andreas Stihl, 7050 Waiblingen, De

Cited By (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5411857B2 (en) * 1973-03-01 1979-05-18
JPS5035540A (en) * 1973-03-01 1975-04-04
US4097561A (en) * 1976-04-23 1978-06-27 Nissan Motor Company, Limited Idle mixture adjusting device of carburetor
US4246929A (en) * 1978-02-13 1981-01-27 Colt Industries Operating Corp Tamper proof idle adjusting screws
US4239710A (en) * 1978-03-03 1980-12-16 Aisan Industry Co., Ltd. Device for checking random adjustment of adjustable parts of carburetor
US4271095A (en) * 1978-08-21 1981-06-02 Toyo Kogyo Co., Ltd. Idle adjusting device for a carburetor
US4242290A (en) * 1979-07-30 1980-12-30 Ford Motor Company Carburetor idle mixture screw enclosure assembly
DE3024980A1 (en) * 1979-07-30 1981-02-05 Ford Werke Ag Safety device for the idle adjusting screw of the carburetor of an internal combustion engine
US5046523A (en) * 1989-06-02 1991-09-10 George Horhota Lock core service valve
US5055238A (en) * 1989-06-30 1991-10-08 Shinagawa Diecast Industrial Corp. Diaphragm carburetor
FR2689188A1 (en) * 1992-03-31 1993-10-01 Stihl Andreas Device opposing adjustments for an adjusting screw.
US5252261A (en) * 1992-03-31 1993-10-12 Andreas Stihl Adjustment safeguard for an adjusting screw
DE4210553C2 (en) * 1992-03-31 2000-08-31 Stihl Maschf Andreas Locking device for a set screw
US5236634A (en) * 1992-09-23 1993-08-17 Walbro Corporation Carburetor needle valve adjustment limiter cap and method of adjusting fuel flow
EP0589405A1 (en) * 1992-09-23 1994-03-30 Walbro Corporation Carburettor needle valve adjustment limiter cap
EP0589149A1 (en) * 1992-09-23 1994-03-30 Walbro Corporation Carburettor needle valve adjustment limiter cap and method of adjusting fuel flow
US5322645A (en) * 1992-09-23 1994-06-21 Walbro Corporation Carburetor needle valve adjustment limiter cap and method of use
US5525267A (en) * 1993-04-30 1996-06-11 U.S.A. Zama, Inc. Tamper resistant limit cap
US5961896A (en) * 1994-09-13 1999-10-05 U.S.A. Zama Inc. Carburetor fuel adjusting device
US5695693A (en) * 1994-09-13 1997-12-09 U.S.A. Zama, Inc. Carburetor fuel adjusting device
US5955007A (en) * 1994-09-13 1999-09-21 U.S.A. Zama Inc. Carburetor fuel adjusting device
US5603869A (en) * 1994-10-19 1997-02-18 Wci Outdoor Products, Inc. Fuel mixture limitation device
US5667734A (en) * 1995-05-19 1997-09-16 Walbro Corporation Carburetor with regulating valve limiting device
US5630965A (en) * 1995-06-02 1997-05-20 U.S.A. Zama, Inc. Low force limit device
US5984281A (en) * 1995-08-30 1999-11-16 Walbro Corporation Carburetor needle valve and limiter cap installation and adjustment apparatus
US5753148A (en) * 1995-08-30 1998-05-19 Walbro Corporation Carburetor needle valve adjustment limiter cap apparatus and method of adjusting fuel flow
US5776379A (en) * 1996-03-26 1998-07-07 Barcarole Limited Carburetor adjustment screw apparatus
US5707561A (en) * 1996-07-18 1998-01-13 Walbro Corporation Tamper resistant carburetor needle valve adjustment limiter
DE19833541A1 (en) * 1998-07-25 2000-01-27 Stihl Maschf Andreas Carburetor for internal combustion engine is portable, manually controlled work apparatus, such as motor chain saw, has suction channel in housing and fuel channel issuing into suction channel
DE19833541C2 (en) * 1998-07-25 2000-07-13 Stihl Maschf Andreas Fuel adjusting screw on a carburetor for an internal combustion engine
US6234458B1 (en) 1998-07-25 2001-05-22 Andreas Stihl Ag & Co. Carburetor with secured control screw
US6467757B1 (en) * 1999-09-27 2002-10-22 Walbro Japan, Inc. Carburetor valve adjustment limiter cap assembly
US6491288B2 (en) * 2000-03-30 2002-12-10 Walbro Japan, Inc. Carburetor fuel mixture adjustment assembly
US6302383B1 (en) * 2000-05-08 2001-10-16 Impco Technologies, Inc. Tamper resistant device for engine adjuster
US6543752B2 (en) * 2000-09-06 2003-04-08 Andreas Stihl Ag & Co. Carburetor for an internal combustion engine and including at least one adjusting screw
US6814343B2 (en) * 2002-12-10 2004-11-09 Walbro Engine Management, L.L.C. Carburetor with plastic idle speed adjustment screw
US20040108605A1 (en) * 2002-12-10 2004-06-10 Gliniecki Gary U. Carburetor with plastic idle speed adjustment screw
US20120018908A1 (en) * 2010-07-24 2012-01-26 Walbro Engine Management, L.L.C. Carburetor valve adjustment limiter
US8348244B2 (en) * 2010-07-24 2013-01-08 Walbro Engine Management, L.L.C. Carburetor valve adjustment limiter
US20120146250A1 (en) * 2010-12-08 2012-06-14 Andreas Stihl Ag & Co. Kg Adjustment Safeguard
US8544829B2 (en) * 2010-12-08 2013-10-01 Andreas Stihl Ag & Co. Kg Adjustment safeguard
CN102536518B (en) * 2010-12-08 2015-11-25 安德烈亚斯.斯蒂尔两合公司 Adjustment protector
CN102536518A (en) * 2010-12-08 2012-07-04 安德烈亚斯.斯蒂尔两合公司 Adjustment safeguard
US10738741B2 (en) 2016-06-16 2020-08-11 Walbro Llc Charge forming device with adjustable valve limiter
CN107524546A (en) * 2016-06-16 2017-12-29 沃尔布罗有限责任公司 Feed forming apparatus with adjustable valve limiter

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Publication number Publication date
DE1751535A1 (en) 1971-07-08
GB1178657A (en) 1970-01-21

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