Abstract: A vacuum actuated valve for a constant vacuum type carburetor is formed with a first guide hole, a jet needle engaging step portion and a jet needle insertion hole therein. A spring seat has an outer cylindrical portion in an upper portion thereof, and an inner cylindrical portion and a jet needle supporting cylindrical portion therein. The outer cylindrical portion of the spring seat is arranged on the outer circumference of a diaphragm plate. The jet needle supporting cylindrical portion is inserted within a first guide hole. A lower end of a vacuum actuated valve return spring engages with a spring seating flange of the spring seat. A flange portion of a jet needle is restricted by the jet needle engaging step portion and the jet needle supporting cylindrical portion.

Abstract: An aerodynamic piece (48) for use with a carburetor having a barrel or round slide throttle valve (10). The piece (48) is formed as an Insert which abuts the undersurface (15) of the slide (10). The piece (48) has an inclined bottom surface (28, 31, 32), the amount of inclination (43, 44, 45) being selected to increase the flow rate through the carburetor throat for a given throttle setting. Air flow passing through the carburetor throat hits the surface (28, 31, 32) and imparts a component of upward motion to the fuel (56) passing by the needle valve (11), thereby Increasing the available cross sectional area of the carburetor throat to which the fuel is exposed for atomization. An indented region (38) at the top of the piece (48) permits the use of the piece with a wide range of original equipment slides (10). A size of the pressure drop relief orifice (40) formed within the aerodynamic piece (48) permits the magnitude of the pressure drop across the needle valve (9) to be varied in a linear manner.

Abstract: A fuel mixture adjusting and limiting device for a carburetor has a body received in a bore of the carburetor and defining a fuel passage through which liquid fuel is supplied to the high and/or low speed system of the carburetor, an inlet opening in the body through which fuel enters the fuel passage from a metering chamber of the carburetor and a metering pin slidably carried by the body and capable of at least partially restricting the flow of fuel through the inlet opening to control the flow rate of fuel through the body. An adjustment screw threadably received in the bore of the carburetor is rotatable to axially displace the adjustment screw and during at least a portion of the axial range of movement of the adjustment screw, the adjustment screw bears on the metering pin to axially displace the metering pin and thereby control the flow area of the inlet opening.

Abstract: Improvement in peanut clip limiter cap holder, wherein the clip spring legs are interconnected by a spring web that flexes to accommodate flexing of the clip legs free ends during insertion of the associated limiter caps into the retaining clip, and prolongs the effective friction grip service life of the clip. Optional detent dimples on the clip spring legs and cooperative limiter cap grooves enhance yieldable retention of the caps in the clip and the clip on the needle valves. When the peanut clip is used to install only a single limiter cap on a single needle valve, a dummy stud is mounted to the carburetor in the vacant needle valve position and the stud head occupies the vacant limiter cap position in the clip. An improved needle valve is made as an assembly of a lathe-turned tip/shank part and a separate precision die cast head part.

Abstract: In a first aspect, a carburetor fuel adjusting device that facilitates control of the quantity of fuel that flows from the fuel chamber to an air intake port of a carburetor by making it possible for the user to adjust an adjustment valve within the limits defined by emission control regulations. The carburetor fuel adjusting device has a cap having two appendages, and an engagement area to engage a valve extension of the fuel adjustment valves of a carburetor. The cap is retained by the retainer in either a disengaged position, or an engaged position wherein the engagement area of the cap becomes attached to the valve extensions. In the engaged position, the adjustment valves can be turned in unison with the cap within a range formed by the angle between the appendages which, when rotated, abut against stoppers.

Abstract: In a first aspect, a carburetor fuel adjusting device that facilitates control of the quantity of fuel that flows from the fuel chamber to an air intake port of a carburetor by making it possible for the user to adjust an adjustment valve within the limits defined by emission control regulations. The carburetor fuel adjusting device has a cap having two appendages, and an engagement area to engage a valve extension of the fuel adjustment valves of a carburetor. The cap is retained by the retainer in either a disengaged position, or an engaged position wherein the engagement area of the cap becomes attached to the valve extensions. In the engaged position, the adjustment valves can be turned in unison with the cap within a range formed by the angle between the appendages which, when rotated, abut against stoppers.

Abstract: A fastening member made of an elastic material is press-fitted in a gapless manner in an insertion hole that divides screw holes in a carburetor body into forward and rearward sections. Screw rods of adjustment valves are screwed into the screw holes and through screw through-holes formed in the fastening member. The screw through-holes have female screw-threads formed by thread rolling. The female screw-threads maintain pressing contact with the surfaces of male screw-threads on the screw rods as a result of the elastic recovery force of the female screw-threads, so that rattling and fuel leakage tend to be prevented.

Abstract: An aerodynamic piece (48) for use with a carburetor having a barrel or round slide throttle valve (10). The piece (48) is formed as an insert which abuts the undersurface (15) of the slide (10). The piece (48) has an inclined bottom surface (28, 31, 32), the amount of inclination (43, 44, 45) being selected to increase the flow rate through the carburetor throat for a given throttle setting. Air flow passing through the carburetor throat hits the surface (28, 31, 32) and imparts a component of upward motion to the fuel (56) passing by the needle valve (11), thereby increasing the available cross sectional area of the carburetor throat to which the fuel is exposed for atomization. An indented region (38) at the top of the piece (48) permits the use of the piece with a wide range of original equipment slides (10).

Abstract: A carburetor adjustment screw apparatus includes an adjusting screw (2) having a shaft (7) in screw threaded engagement with a carburetor body (4) and a head (8) by which the shaft may be rotated. A generally tubular open-ended housing (10) surrounds the head of the screw and a ring (11) is rotatably mounted in the open end of the housing. Stop means (19/20) limit the angular range of rotation of the ring. A plug (12) is mounted in the ring and engages the screw such that rotation of the plug effects corresponding rotation of the screw. The plug is movable relative to the ring between a first axial position wherein the plug can rotate independently of the ring and a second axial position wherein the plug engages the ring for co-rotation therewith such that the angular range of rotation of the plug is limited to the angular range of rotation of the ring.

Abstract: In a first aspect, a carburetor fuel adjusting device that facilitates control of the quantity of fuel that flows from the fuel chamber to an air intake port of a carburetor by making it possible for the user to adjust an adjustment valve within the limits defined by emission control regulations. The carburetor fuel adjusting device has a cap having two appendages, and an engagement area to engage a valve extension of the fuel adjustment valves of a carburetor. The cap is retained by the retainer in either a disengaged position, or an engaged position wherein the engagement area of the cap becomes attached to the valve extensions. In the engaged position, the adjustment valves can be turned in unison with the cap within a range formed by the angle between the appendages which, when rotated, abut against stoppers.

Abstract: A needle valve limiter cap of single-stage and two stage types having a hollow cylindrical outer body of rigid material, carrying a limiter arm. A spring steel hollow retainer clip sleeve is telescopically received in the body and has inwardly and outwardly protruding resilient barbs reversely oriented relative to one another to respectively engage the cap body and the needle valve shank to respectively prevent retrograde relative telescopic motion between the clip and the body and between the clip and valve shank. Easy seating of the single or two-stage caps into their locked first and/or second stage needle adjustment positions also produces an audible click and feel as the inwardly protruding spring barb(s) snap into a needle shank groove or grooves. A cap living-hinge type anti-tamper flap at the cap end prevents access of any adjustment tool to a needle valve head.

Abstract: A limiter of the extent of adjustment of a fuel metering needle valve of a carburetor for an internal combustion engine. The limiter has a housing with a passage in which the head end of the needle valve is received and a cap received in the passage on the head end of the valve for rotation in unison with the valve. An arm carried by the body of the cap is engagable with a stop in the passage to limit to less than one complete revolution the extent to which the cap and needle valve can be rotated by an end user to adjust the needle valve. To provide a tamper-resistant limiter, the head of the cap is received in a bore of the housing passage with either only a slight clearance between them or an interference fit which also inhibits rotation of the valve by vibration of the operating engine on which the carburetor and limiter are utilized.

Abstract: A carburetor fuel adjusting device that facilitates control of the quantity of fuel that flows from the fuel chamber to an air intake port of a carburetor by making it possible for the user to adjust an adjustment valve within the limits defined by emission control regulations. The carburetor fuel adjusting device has a cap having two appendages to limit its turning in the lean mixture direction and in the rich mixture direction, and an engagement area to engage a valve extension of the fuel adjustment valves of a carburetor. The valve extensions are inserted through insertion holes of a retainer attached to the carburetor body. When the cap is retained by the retainer in a disengaged position, wherein the engagement area is not attached to the valve extensions of the fuel adjustment valves, the adjustment valves can be adjusted separately from the cap. The cap, however, can be moved forward to an engaged position wherein the engagement area of the cap becomes attached to the valve extensions.

Abstract: The invention is directed to a spray cooler for regulating the temperature of superheated steam with a stream of cooling water. Its primary inventive feature is directed to a throttle area which has a continuously widening cross section disposed on a piston rod and arranged between the cooling water inlet opening and the nozzles of the spray cooler. The throttle area serves to regulate the pressure the cooling water in proportion to the movement of the piston carrying the throttle.

Abstract: A carburetor in which no deviation or change occurs in the adjusted position of a fuel regulating needle valve and when a cap for limiting the adjustment is mounted on the fuel regulating valve the cap cannot be intentionally broken or removed. A flow area of a fuel pasage of a carburetor body is adjusted by a needle valve received in a threaded hole in the body. Adjacent the threaded hole the carburetor body has a cylindrical cavity having a larger diameter than that of the threaded hole. A larger-diameter threaded portion is provided on the needle valve adjacent its head. A stop ring in contact with a shoulder in the cylindrical cavity is fitted on the larger-diameter threaded portion of the valve. A cup-shaped cap is fitted on the serrated head of the fuel regulating valve. An axial protrusion formed on the outer peripheral wall of the cap is engaged with an axial groove opening into the peripheral wall of the cylindrical cavity.

Abstract: A carburetor includes a main fuel jet having a reciprocal needle received therein for controlling fuel as such fuel flows into an air flow passage of the carburetor. The needle includes a stepped portion which is integrally formed or rigidly affixed thereto. The stepped portion is located along the length of the needle such that is located within the fuel jet in the minimum fuel flow position of the needle. This stepped portion prevents unwanted fuel from wicking or traveling up along the length of the needle when the needle is in its minimum fuel flow position and fuel flow through the fuel jet is to be at its minimum value.

Abstract: A fuel adjustment screw apparatus for a diaphragm-type carburetor comprises a screw member (4) having a shaft (4a) and a head (12) by which the shaft may be rotated, with a generally tubular open-ended housing (9) surrounding the head of the screw member. A cap member (10) is mounted in the housing and is movable axially of the screw member between a first position (as seen in FIG. 1) and a second position (FIG. 2). The cap member is held clear of the head of the screw member in the first position so that the screw member can rotate freely, and engages over the head of the screw member in the second position for rotation with the head. The housing has stop means (20) which is engaged by the cap member in the second position for limiting the angle of rotation of the head.

Abstract: A carburetor fuel adjusting limit device that facilitates control of the quantity of fuel that flows from the fuel chamber to an air intake port of a carburetor by making it possible for the user to adjust a fuel adjustment valve within the limits defined by emission control regulations. The limit device has a cap that comprises an engagement area to engage a valve extension of the fuel adjustment valve and radially extending appendages to limit rotation. The construction of the engagement area, which includes axial and radial locks, enables the cap to be pressed onto the valve extension with a relatively low amount of force. The fuel adjustment valve includes a screw head attached to the valve extension and constructed to break away from the valve extension at a torque that exceeds about 8 kg-cm. A retainer is utilized to retain the cap in a disengaged position adjacent the valve extensions. Once the cap is pressed onto the valve extension the cap and the fuel adjustment valve rotate as a unit.

Abstract: A limitation device which limits post-adjustment rotation of an adjustment screw (10) on single adjustment screw carburetors (20). In one embodiment, the limitation device uses a limiter cap (100, 200) removably attached to the adjustment screw (10) which works in conjunction with a limiter stop (300, 400) attached to the carburetor. In a second embodiment, the limitation device uses a limiter cap (700) removably attached to the adjustment screw (10) which works in conjunction with a plate (600) attached to the carburetor. In either embodiment, the limiter cap (100, 200, 700) presents a first and second rotational stop (110, 210) which cooperates with at least one rotational stop (304, 306, 404, 406, 606) on the limiter stop (300, 400) or plate (600). A special tool and method is also disclosed for installing and removing the device from the carburetor.

Abstract: A carburetor of the slide and metering rod type is characterized by the provision of an adjusting screw assembly which has an audible sound feature resulting in a click every quarter revolution of the carburetor adjusting screw. With this clicking, the carburetor can be precisely adjusted by merely counting the number of clicks in either a clockwise or a counterclockwise rotation.

Abstract: A tamper resistant limit cap for a carburetor having manual adjust valves that are able to adjust the effective area of the main fuel passage and the slow speed fuel passage. The cap covers tightly on the head part of the main fuel adjust valve and includes a flange attached to the outside of the cap that abuts a stop upon rotation of the cap, a guide flange attached to the outside of the cap to locate, upon installation, the final position of the cap, and two projections on the inside of cap to prevent removal of the cap from valve head part or independent rotation of the cap and head part relative to each other.

Abstract: The invention is directed to a carburetor for an internal combustion engine and includes an intake channel having a throttle flap mounted therein. Fuel passes from a fuel-filled control chamber via channels to main and idle nozzles through which the fuel enters the intake channel. The maximum permissible fuel quantity must be adjusted during a test run be means of an adjusting screw. This value can be changed by an operator. The maximum flow cross section for the fuel throughput is limited by at least one fixed throttle to which the main nozzle and the idle chamber are connected at the downstream end. In this way, strict exhaust-gas limit values are maintained. An adjustable throttle is provided with the aid of which the entire flow cross section can be reduced up to a pregiven minimum value. The carburetor described above is especially suitable for two-stroke engines of portable handheld work apparatus.

Abstract: A cap and method for limiting the range of adjustment of a fuel flow metering valve in a carburetor. The cap has a body with an arm projecting generally radially outwardly therefrom to abut against a stop carried by the carburetor to limit valve rotation and a passage therein for telescopically axially receiving the head end of a shank of the valve. Portions within the passage enable the cap to be retained in the shank of the valve in a freely rotating first position during assembly and arm orientation, and in a second position securing the cap to the valve to limit adjustment and maintain emissions calibration. Preferably, the cap may also be moved to a third position to releasably drivingly engage the valve to perform fuel flow adjustment before securing the cap to the valve. The cap can also be prepositioned angularly relative to an adjusted position of the valve before it is moved to its second position on the valve to limit the extent of subsequent adjustment of the valve.

Abstract: A carburetor of the slide and metering rod type is characterized by the provision of a tapered metering rod for streamlining the flow of air from the inlet end of the carburetor around the metering rod to reduce turbulence and increase air velocity by compressing the air flow. The metering rod has a wedge configuration with the forward pointed edge thereof facing in the direction of the inlet end and the side walls thereof tapering outwardly and rearwardly from the forward edge.

Abstract: The invention is directed to an adjustment safeguard for an adjusting screw rotatably held in a housing. The adjusting screw has a head which projects outside of the housing and a cap is mounted on the head of the adjusting screw so as to be accessible to an operator for imparting a rotational movement thereto. The cap has an appendage formed thereon and stops are provided which coact with the appendage to delimit the rotational range through which the adjusting screw can be rotated. A sleeve is disposed in surrounding relationship to the cap and is connected thereto. The cap is disposed almost entirely within the sleeve so that an operator cannot reach the cap for levering the latter off the adjusting screw without causing permanent visible damage to the safeguard. Accordingly, an effective tampering with the adjusting screw for obtaining a setting outside of the permitted adjusting range is effectively prevented since such a tampering will leave permanent visible damage.

Abstract: The stem of a needle valve for regulating fluid flow is threaded into the valve housing. A reversible electric motor, whose shaft engages the stem coaxially, rotates the stem and causes it to move the plug on the end of the stem into and out of a fluid flow port. A helical spring slidably located in a longitudinal bore in the stem is compressed by the shaft to urge the stem toward the housing in order to maintain a working threadable connection between the stem and the housing even when the stem is almost completely withdrawn.

Abstract: A cap and method for limiting the range of adjustment of a fuel flow metering valve in a carburetor. The cap has a body with an arm projecting generally radially outwardly therefrom to abut against a stop carried by the carburetor to limit valve rotation and a passage therein for telescopically axially receiving the head end of a shank of the valve. Portions within the passage enable the cap to be retained on the shank of the valve in a freely rotating first position during assembly and arm orientation, in a second position securing the cap to the valve to limit adjustment and maintain emissions calibration, and in a third position to releasably drivingly engage the valve to perform fuel flow adjustment before securing the cap to the valve.

Abstract: A fuel valve 1 is provided for injecting liquid fuel into a stream of air which comprises a valve member 2 movable along a displacement axis 3 with respect to a valve seat 4 to vary the fuel flow through the valve 1. The valve member 2 and the valve seat 4 have substantially parallel surfaces 7 and 9 which are inclined with respect to the displacement axis 3 and which define therebetween a passage for the flow of fuel having a width W corresponding to the distance apart of the surfaces 7 and 9 and a length L corresponding to the degree of overlap of the surfaces 7 and 9. The length L of the passage varies substantially in proportion to the width W as the valve member 2 is moved along the displacement axis 3. Such a valve construction minimizes the effect of momentum changes in the fuel orifice, and enables accurate control of fuel flow over a wide range of air flows and mixture strengths.

Abstract: An improved vacuum operated air valve for incorporation into the idle fuel port of an automotive carburetor. The valve includes a valve seat having an inner conically-shaped area and a surrounding planar area. The valve member includes an axially oriented stem and a flat radially-extending head, an outer end surface of which overlies the valve seat surfaces, whereby opening the valve to a very minute axial displacement opens a substantial venting area, increasing the sensitivity of the valve.

Abstract: There is disclosed herein an arrangement for limiting the rotation of adjustment valves which control main and idle fuel paths in a diaphragm carburetor. The valves are disposed relatively close together and have caps that are configured to act as stoppers for each other so as to limit the maximum rotation of each valve.

Abstract: A carburetor assembly which has a body formed of extruded aluminum and a plastic fuel bowl assembly secured to the body by means of a resilient spring clip. A gasket is located between the body and the fuel bowl. The fuel bowl is molded of plastic and includes an integral well, and a mixing screw housing as well as a primer housing. A plastic nozzle extends from the well through the venturi insert into a through passage into the body. The venturi insert is made of plastic material and includes molded grooves therein which form passages with the through passage of the body. The nozzle is resiliently urged against the gasket and the body by means of a spring located in the well thereby sealing the nozzle to the body.

Abstract: A carburetor comprising a combined float bowl and venturi section including an air passage with a venturi, a rotatably supported throttle valve plate located in the air passage, and a float chamber adapted to contain fuel, and a separate metering section mounted on the float bowl and venturi section, the metering section being molded of plastic and including a fuel passage communicating between the float chamber and the air passage, a needle valve seat within the fuel passage, an internally threaded bore having therein threads molded integrally with the metering section, and an externally threaded needle valve threadedly received in the bore and being movable into and out of engagement with the valve seat for controlling fuel flow through the fuel passage.

Abstract: A mechanism for idling position adjustment of a diaphragm carburetor will be described. The carburetor includes an idling nozzle which receives a fuel/air emulsion from an emulsifying chamber under idling conditions. The emulsifying chamber receives fuel from a fuel chamber and air from an acceleration port opening into the mixing passage. Furthermore, the emulsifying chamber communicates via a flow control valve to a venting port opening into the mixing passage. The flow control valve is coupled to the shaft of the throttle valve via mechanical connection means so that the idle position of the throttle valve is varied in accordance with manual adjustments of the flow control valve. This allows to adjust the fuel/air ratios under idling conditions by means of a single adjustment member.

Abstract: The position of the metering rod relative to the slide member of a carburetor is adjusted by rotation of an adjusting screw which slidably extends through an opening in a plate member fixedly mounted within a substantially vertical bore in the slide member. The upper end of the adjusting screw has an enlarged head in engagement with the upper surface of the plate member and is engageable with a suitable tool to rotate the adjusting screw. The lower end of the adjusting screw is threadably received within a threaded bore in the head portion of the metering rod which is slidably and nonrotatably received within the bore in the slide member. A helical spring member surrounds the adjusting screw and is disposed between the lower surface of the plate member and the head portion of the metering rod to urge the metering rod downwardly. Accordingly, rotation of the adjusting screw causes the metering rod to move upwardly or downwardly so as to vertically adjust it relative to the slide member.

Abstract: Carburetor altitude compensator apparatus (20) includes fingertip adjustable fuel to air mixture adjustment screw (22). The adjustment screw (22) includes a tracking member (30) rotatable therewith and cooperating with a graduated scale (42) to indicate the altitude at which optimum fuel/air mixture is derived for any given setting of the adjustment screw (22). An indentation (34) cooperates with the tracking member (30) to limit the range of possible adjustment of the adjustment screw (22) so as to avoid engine damage regardless of what adjustment the adjustment screw (22) is set at.

Abstract: A temperature compensated carburetor having a fuel metering system including a variable restriction needle gate valve for varying the effective flow cross-sectional area of the main and/or idle fuel supply duct to modulate the flow rate of fuel to the carburetor venturi mixing passage. The needle gate valve is made of plastic material having a much greater coefficient of expansion than the aluminum carburetor body in which it is adjustably mounted such that differential linear expansion and contraction of the needle valve relative to the carburetor body in response to ambient temperature changes varies the flow-controlling cross-sectional area of the fuel duct inversely relative to ambient temperature changes. The needle valve is a rod-like body with a threaded cylindrical mounting portion at one end threadably secured in a threaded bore in the carburetor body.

Abstract: A system for automatically levelling a vehicle, such as a recreational vehicle, relative to gravity includes a plurality of extensible jacks, preferably hydraulic, disposed at strategic positions on the vehicle underside. Switches sense the downward tilting of the vehicle relative to gravity at the strategic positions and produce signals to operate the jacks in accordance with such tilting. Before the jacks are extended, air bags in the vehicle are deflated. When the hydraulic pressure in a hydraulic circuit exceeds a first value, the jacks are extended in a particular sequence depending upon the particular directions in which the vehicle is tilted relative to gravity. A delay is preferably provided between the operations of each jack and the next jack in the sequence to eliminate transients in the next jack operation. When the vehicle has been levelled, jacks not previously extended are extended until they engage the ground with a second pressure less than the first pressure.

Abstract: Aquarium with a multiple conduit fixture through one wall, the fixture including an air inlet connected to a plurality of air outlets and a water conduit, each of the air outlets and the water conduit having a throttle valve means at the outside end of the fixture to regulate the flow of air and water respectively, and a perforated support sheet to cover the inside bottom of the aquarium and any conduits for air or water, and to support thereon a gravel bed and any decorative items on the bed, the aquarium featuring several air bubbling locations.

Abstract: This invention relates to a two-fluid nozzle which is adjustable to provide a substantially constant mixing energy. Adjustment of the two-fluid nozzle is made in accordance with the pressure and mass flow values of the liquid and gas fed to the nozzle. A microprocessor calculates the mixing energy from these values and provides an output to the nozzle to adjust it should its mixing energy be in variance with a pre-selected mixing energy.

Abstract: A system for automatically levelling a vehicle, such as a recreational vehicle, relative to gravity includes a plurality of extensible jacks, preferably hydraulic, disposed at strategic positions on the bottom of the vehicle. A plurality of switches sense the downward tilting of the vehicle relative to gravity at the strategic positions and produce signals to operate the jacks in accordance with such tilting. The jacks are extended in a particular sequence depending upon the particular directions in which the vehicle is tilted relative to gravity. The jacks become extended only when the hydraulic pressure in a hydraulic circuit exceeds a particular value. Since the rear of the vehicle weighs considerably more than the front, the switches are constructed and are connected in a circuit to resolve any ambiguities in favor of initially operating the jacks at the rear of the vehicle.

Abstract: A carburetor comprising a fuel/air induction passage, a secondary orifice communicating with the induction passage, and a fuel supply system operable to supply fuel from a source of fuel to the secondary orifice, the fuel supply system including a wall defining an elongated enclosed chamber having a longitudinal axis and a first end, the wall including an inlet communicating between the source of fuel and the chamber, and, at the second end, an outlet communicating between the chamber and the secondary orifice, the outlet including a valve seat, a valve member within the chamber and including a needle portion adapted to engage the valve seat, the valve member being movable within the chamber along the longitudinal axis of the chamber relative to a closed position wherein the needle portion sealingly engages the valve seat, a spring biasing the valve member toward the closed position, and an adjustment rod selectively engageable with the valve member for selectively and releasably moving the valve member away

Abstract: A variable venturi carburetor comprising an air passage provided in a suction piston, a needle mounting member provided at the head portion of the suction piston for mounting a fuel metering needle and an air discharging member provided at the needle mounting member, wherein the air passage communicates the air intake passage upstream of a venturi portion with the needle mounting member and is communicated with the venturi portion through the air discharging member.

Abstract: A tamper-resistant seal is disclosed for discouraging unauthorized access to an adjusting screw located in a fuel injection pump. The seal includes a bracket secured by one-way fasteners to the pump and is positioned adjacent to the adjusting screw. The bracket also includes a stud projecting outwards from its outer surface. A cover having an aperture formed therein is positioned over the bracket such that the stud passes through the aperture. When so aligned, the cover will completely enclose the one-way fasteners and the adjusting screw thereby preventing access to them. The cover is secured to the bracket by a fastener which locks onto the stud. The fastener prevents the removal of the cover from the bracket without physically destroying the seal. Such a seal is beneficial in providing visual assurance to the manufacturer that his pump has not been tampered with.

Abstract: Disclosed herein is a variable venturi carburetor for an internal combustion engine in an automobile comprising an air passage provided in the suction piston for communicating the inlet of the air intake passage with the base portion of the fuel metering needle and an air discharge portion provided in the fuel metering needle for communicating the air passage with the venturi portion.

Abstract: A valve assembly is provided for replacing the idle mixture jet screw of a conventional carburetor and includes structure for aerating the liquid fuel metered by the valve assembly, adjustably metering the aerated fuel supplied to the associated carburetor idle fuel port during idle operation mode of an associated combustion engine, increasing the flow of aerated fuel through the idle fuel port responsive to increase of engine speed while the associated throttle valve is open and at the same time effectively decreasing venturi vacuum of the associated carburetor and thus reducing carburetor main jet fuel flow, and reducing flow of fuel through the idle fuel port below idle mode fuel flow when the engine is operating under an engine braking mode, and reducing fuel flow during cruising operation mode; and also in the said three operating modes reducing the CO (carbon monoxide) in the residual of combustion; this as a result of a most complete combustion.

Abstract: A carburetor comprising a body defining a throat, a throttle slide member slidably mounted on the body and disposed in the throat, a rotary actuator for the slide member, and a tapered metering rod or needle mounted on the slide member and extending downwardly into a fuel supply tube leading into a sealed and pressurized fuel reservoir or bowl secured to the body. The slide member has front and rear, substantially flat panels disposed in substantially parallel relation, with the front panel being shorter than the rear panel for the purpose of providing air at the outlet of the fuel supply tube even when the slide is in a closed position and for directing air toward and around the outlet when the slide is in an open position. The bottom of the rear panel has a cut-out portion in alignment with the metering rod and fuel outlet at the throat for the purpose of directing high speed air flow toward the metering rod and around the fuel outlet.

Abstract: A fuel metering apparatus, for supplying metered fuel to an associated combustion engine, has an idle fuel metering and supply system comprising adjustable valving means which, in turn, comprises a discharge orifice means and cooperating valving member which is adjustably selectively positioned with respect to such orifice means in order to thereby establish a desired metered rate of fuel flow through the thusly determined effective flow area of the orifice means for a particular pressure differential thereacross; the adjustable valving member is generally contained within a cooperating body member or portion and access to the valving member, subsequent to it being selectively positioned, is prevented by a closure member or sealing plug placed in position after the said selective positioning of said valving member; the sealing plug is formed as by a hardened metal disc and caged within a body which body is held by the cooperating body member containing the valving member; relative rotation as between the cagi

Abstract: An adjustable idle needle valve assembly for an internal combustion engine carburetor includes an air bleed threaded needle valve mounted on a plug for a tubular metal housing, an insulating fiberglass sleeve in the housing and an electric needle valve heater coil within the insulating sleeve. The heater coil extends between the needle valve mounting plug and an outer air inlet plug for the tubular metal housing. An air-conducting shield tube extends between the plugs for isolating the flow of bleed air from the insulating sleeve, particularly when the outer plug is connected to a liquid vapor trap.

Abstract: A fuel control system for gasoline operated vehicles includes a metering device connected to the fuel line for controlling the rate of flow to the carburetor to permit a normal rate under ordinary driving conditions and an increased rate of flow under accelerated conditions with a filter being connected to the fuel line upstream from the metering device to prevent blockage of the main metering valve in the metering device and a second filter downstream from the metering device to act as a auxiliary reservoir.

Abstract: A variable venturi carburetor in which a biasing spring urges a metering needle to contact the metering jet during low air-intake operating conditions and including an expanded portion formed at the front end of the metering needle which is loosely contained in a large bore portion of a well during low air-intake operating conditions and which engages a small bore portion of the well during high air intake operating conditions to center the metering needle in the metering jet for maintaining bleed sensitivity constant while the amount of bleed air varies.