Abstract: The priming system for a dual feed internal combustion engine provides a lighter, starting fuel to the venturi, the fuel nozzle, or to the carburetor bowl for engine starting. In a first embodiment, the starting or secondary fuel is mixed with the primary fuel in the fuel bowl, and the pure secondary fuel is provided to the fuel nozzle by actuation of a manually-operable primer. In a second embodiment, the secondary fuel is mixed with the primary fuel in the carburetor fuel bowl, and a shot of pure secondary fuel is provided directly to the carburetor venturi by the actuation of a manually-operable primer. In a third embodiment, a primer is manually operated before engine starting to remove primary fuel from the carburetor bowl and return it to the primary fuel tank. Thereafter, pure secondary fuel is provided directly to the carburetor bowl for engine starting through a changeover valve.

Abstract: A lubrication system for furnishing an atomized lubricant from a liquid supply into a working air line delivering compressed air to a pneumatic tool includes a liquid reservoir subjected to the combined air line dynamic and static pressures and having an atomizing delivery nozzle projecting in the direction of air flow with a bore sufficient to permit the lubricant to weep there along and to be initially atomized therein before discharge as an aerosol in the working air stream.

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: 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 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: Apparatus for atomizing fuel in a carburetor having a fuel inlet. The apparatus includes a mechanism for improved atomization of fuel leaving the fuel inlet. A mechanism is included for adjusting the atomization of fuel by adjusting the atomizing fuel mechanism relative to the fuel inlet. The atomizing fuel mechanism is supported within the carburetor. The support may extend through the carburetor housing or be formed integral the carburetor housing. Alternatively, a support may be carried by the fuel inlet.

Abstract: A carburetor with a main fuel jet and a throttle valve in a mixing passage and an apparatus for automatically supplying an enriched fuel and air mixture when an engine is cranked for starting and initial running of the engine upon starting. The apparatus has a mixing chamber with an air intake passage communicating with the mixing passage upstream of the throttle valve, a fuel inlet passage, and an outlet passage for the fuel and air mixture which communicates with the mixing passage downstream of the throttle valve. A valve for controlling the flow of the enriching fuel and air mixture through the outlet passage is manually movable to its opened position where it is releasably retained by an actuator mechanism operably associated with the throttle shaft for releasing and closing the valve when after the engine starts the throttle valve is initially moved from its idle position toward a full open position of the throttle valve.

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: Apparatus which accelerates the cooling of the stored water cooled in the storage tank after a refilling operation so that it corresponds to the temperature that is normally reached after a relatively long water storage period. The apparatus includes a carbonator tank having at least one spray opening in the water feed line leading into the head-space region of the carbonator storage tank and where the spay opening is directed to the side walls of the tank in the vicinity of an ice bank formed on an upper inner wall surface thereof. An additional spray opening is oriented so that it points directly at the water surface and by a relatively simple valving arrangement both downward and/or lateral sprays can be implemented.

Abstract: In a carburetor for an internal combustion engine, the improvement embodying an air flow surface disposed strategically in a venturi or air flow passageway of the carburetor, the air flow surface providing enhanced air flow velocity characteristics over a region thereof relative to the free stream velocity over the air flow surface, and an orifice located adjacent to the air flow surface in the vicinity of the region of enhanced air flow velocity so as to provide a vacuum signal through the orifice which corresponds substantially proportionally to the air flow velocity through the venturi or air flow passageway, the vacuum signal being usable for improving fuel delivery characteristics to the venturi as well as for other purposes. Several methods for incorporating the present invention into existing carburetor constructions are likewise disclosed.

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 readily mountable and removable carburetor-adjusting control harness accessory for use with a jet-propelled personal watercraft having a deck with a top engine compartment opening and a hood in sealed engagement with the deck at the periphery of the compartment opening to prevent entry of water into the Compartment, the harness having at least one coaxial structure comprising an outer casing and an inner flexible rotatable but non-twistable shaft, one end of the casing of each coaxial structure being in sealed relationship between the hood and the deck with that one end extending to the outside of the compartment when the compartment is closed by the hood, the inner shaft of each said structure extending throughout the length of the respective casing and beyond the ends of the casing, the outer manually accessible end of each shaft having a manually rotatable knob thereon for remote adjustment of a carburetor adjusting member on the other end of the shaft, a bracket structure for anchoring the carburetor en

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: 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: The present invention relates to an adjustment bubble bend. The structure of the adjustable bubble bend allows the user to control the volume of the bubbles produced by the device and to reduce the noise emitted from the device during operation.

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: An improved evaporative cooler containing a new and unique designed funnel induction system, which creates a greater vacuum of air drawn directly through each pad frame equally, and into the split squirrel cage, thereby increasing the vacuum and cooling efficiency by completely bypassing any heat generated or trapped inside the evaporative coolers dead space. The wettable air permeable pads have been redesigned and incorporated in a sandwich-type installation, being constructed of an absorbent spong-like plastic fiber, backed by a layer of coarse mesh-like type plastic fiber filter, thus providing a cleaner hygienic air supply,--at the same time reducing the amount of water needed in prior art evaporative coolers.

Abstract: A carburetor including a valve apparatus comprising a wall defining a chamber having an axis and having therein an inlet communicating with the chamber and an outlet communicable with the chamber and having a valve seat, a valve member having two opposite ends and a variable length in the direction of the axis which decreases only when at least a predetermined force is applied to the valve member in the direction of the axis, the wall supporting the valve member and being threaded so as to allow movement of the valve member along the axis and into and out of sealing engagement with the valve seat, the wall having a step extending into the chamber and engageable with the valve member, the step limiting the movement of one end of the valve member towards the valve seat.

Abstract: Steam distribution lines may be adapted for desuperheat without being removed from service by adding a branch conduit and a closure valve, hot tapping the line through the closure valve and adding a desuperheater apparatus including an elongated injection conduit with water injection nozzles disposed near the distal end thereof. An insertion and retraction device is mounted on the valve and supports the desuperheater apparatus for insertion of the desuperheat water injection conduit into the interior of the distribution line without interrupting steam flow. Temperature indicators and controllers are similarly installed on the distribution line downstream of the desuperheater apparatus.

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: Apparatus for adjustment of the main metering jet of a modular type high performance engine carburetor avoiding the problem of having to partially disassemble the carburetor in order to change the main metering jets. The invention includes a continuously adjustable elongated metering rod having a tapering point proximate the fuel orifice hole of an elongated cylindrical fuel metering jet, the rod adapted to pass horizontally through the carburetor float bowl module to the outside of the carburetor for external adjustment. The main metering jet is modified by a transverse located opening to pass fuel to the longitudinal fuel orifice hole with a second larger diameter concentric longitudinal hole adapted to receive and guide the metering rod pointed end into the fuel orifice hole.

Abstract: An apparatus for dispensing a water treating composition into the recirculating water of an evaporative system, such as an evaporative cooler. The water treating composition is contained in a container that is suspended in an inverted condition within the housing of the evaporative cooler with the outlet of the container facing downwardly. One end of a drip line is connected through a sealed closure to the interior of the container, and the opposite end of the drip line terminates above the level of water in the reservoir of the evaporative cooler. A manually adjustable needle valve is connected in the drip line and controls the gravity feed of the liquid composition through the drip line to the reservoir. Through the addition of the treating composition, scaling problems in the evaporative system are minimized, corrosion is eliminated and growth of bacteria and algae is inhibited.

Abstract: Carbonating apparatus includes a reservoir to be filled with fresh water through an outlet. Rotation of a control opens a valve, so that water passes from the reservoir into a pressure vessel. The control is then depressed to cause pressurized gas to be introduced into the water in the vessel, via a nozzle, from a gas cylinder, so as to carbonate the water. A slidably-operable control is then moved by an initial amount to cause a venting valve to open, thereby venting excess gas in the vessel to atmosphere. Further sliding movement of the slidably-operable control depresses a lever connected to an outlet valve, which permits dispensing of the carbonated water from the vessel, via a spout.

Abstract: A combination humidifier/water distiller apparatus comprises a container for holding tap water. A heater is provided for heating tap water in the container to a vaporized state. A condenser, positioned over the container, condenses the vaporized tap water into distilled water. A receptacle is positioned under the condenser for the collection of the distilled water. The receptacle includes a water track and valve for removing distilled water from the apparatus for other purposes. A nebulizer is included which converts the distilled water into a fine spray. A passage, associated with the nebulizer and the receptacle, supplies distilled water from the receptacle to the nebulizer so that distilled water is nebulized to a fine spray. The nebulizer includes a nozzle or the like for delivering the fine spray to the atmosphere to thereby humidify the surrounding air.

Abstract: The invention relates to a venturi scrubber for dust-laden gases, includes an intake portion (1) whose duct (8) through which the gas flows progressively reduces in size in the direction of flow (5, 6), and a ring duct (13) for a fluid, which is disposed at the largest-diameter end (12) of the intake portion (1) and which is connected over its entire periphery to the duct (13) of the intake portion (1), through which the gas flows, wherein at least one feed conduit (17) for the fluid opens substantially tangentially into the ring duct (13). The duct (13) which is under an increased pressure is connected by way of a through-flow gap (27) to the duct (8) of the intake portion (1), through which the gas flows. The flow gap (27) is so formed and arranged that the fluid issues substantially parallel to the adjoining region of the wall (7) of the duct (8), along said wall.

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 carburetor comprises an air induction passage and a choke valve movable in the air induction passage. The carburetor also includes a fuel chamber and a fuel inlet valve which controls the introduction of fuel into the chamber. A control rod is operative for movement axially along and rotationally about its longitudinal axis. The control rod is operatively linked with both the choke valve and the fuel inlet valve such that movement of the control rod in one of its axial and rotational directions operates the choke valve and movement of the control rod in the other one of the axial and rotational directions operates the fuel inlet valve.

Abstract: An improved carburetor having a mixing passage adapted for connection to an internal combustion engine, a pair of venturi plates pivotally mounted in the passage positioned in response to vacuum generated by the engine, a fuel spray bar extended across the passage, a primary fuel system for supplying a primary fuel to the bar automatically controlled in response to the positions of the plates, and an enrichment fuel system for supplying an enrichment fuel to the bar automatically controlled in response to the positions of the plates independently of the primary fuel system.

Abstract: Emergency fuel chamber adjacent to a carburetor float chamber is filled from the float chamber and gasoline from the emergency chamber flows to the float chamber upon actuation of a valve.

Abstract: A carburetion system for an internal combustion engine having improved fuel metering is disclosed and includes a fuel supply conduit which is formed in a portion of the body of the carburetor extending from a fuel source to the carburetor bore with that carburetor body portion having a first linear temperature coefficient of expansion. A mixture control member formed of a material having a second linear temperature coefficient of expansion engages the body in a first region and defines relative to the carburetor body in a second remote region a fuel metering orifice for controlling fuel flow through the fuel supply conduit. The mixture control member may be moved relative to the first and second regions to change the fuel to air ratio supplied to the engine. Employing a fuel metering orifice in the adjustable fuel metering arrangement, the minimum flow area of which has a simply connected convex cross sectional configuration, minimizes the adverse effects of ambient temperature changes.

Abstract: A carburetor for an internal combustion engine in a power saw. The carburetor has at least one adjustment screw which is fastened and secured in a bore of a receiving part on the carburetor housing or on the internal combustion engine. A shim or clamping piece, which is secured against rotation, is arranged in a recess of the receiving part. The clamping piece receives the adjustment screw in a positive, locking manner. The clamping piece has projections with which the clamping piece is held locked in the recess of the receiving part.

Abstract: A carburetor adapted to change a rate of fuel flow and an air bleeding characteristic so as to optimize the engine operation irrespective of change in fuel, for example, from gasoline to alcohol or change in altitude. The carburetor includes a main nozzle opening to an intake passage, a fixed support cylinder having a peripheral wall formed therethrough with a plurality of apertures, the peripheral wall being surrounded by an annular chamber communicating with the intake passage upstream of the main nozzle, and an air bleed pipe rotatably fitted in the fixed support cylinder and communicating with the main nozzle and a float chamber. The air bleed pipe has a peripheral wall formed therethrough with a plurality of groups of air bleed ports of different air-bleeding characteristics so that when the pipe is rotated relative to the fixed support cylinder, one group of the air bleed ports are placed into communication with the apertures in the fixed support cylinder so as to change the air bleeding characteristic.

Abstract: An improved carburetor (10) is disclosed and claimed by this application. The carburetor (10) includes an updraft section (16), a crossdraft section (18), and a downdraft section (20). The updraft section (16) includes a mixing chamber (22) in which fuel and air are mixed. This mixture formed therein passes into a plenum (84) of the crossdraft section (18) through which a plurality of ducts (88) extend. A hot fluid passes through these ducts (88) to heat the mixture passing through the plenum (84). The mixture, thereafter, passes through a plenum outlet (86) into another plenum (104) of the downdraft section (20) and to an intake manifold (12) for distributing the mixture to the cylinders of the engine.

Abstract: Disclosed herein is a carburetor comprising a body including an air induction passage, a choke valve pivotally supported in the air induction passage for pivotal movement between choke open and choke closed positions, a fuel inlet valve selectively operable for controlling introduction of fuel from a source into a fuel chamber, a control member supported by the body, having an axis, and operative for movement axially along and rotationally about the axis, and a linkage opertively connecting the control member with the choke valve and the fuel inlet valve for operating the choke valve in response to axial movement of the control member between choke open and choke closed positions and for operating the fuel inlet valve in response to rotational movement of the control member, which linkage includes a rigid arm extending fixedly from the choke valve, a choke control link integrally including a body part on the control member, an end part pivotally connected to the arm, and an intermediate resilient connecting p

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: A fuel calibration device is provided for replacing the original metering device associated with the carburetor and the fuel bowl of an internal combustion engine to enable the various fuel flows to be adjusted and calibrated. The metering systems of the device are accessible for interchanging them. A plurality of different metering systems are made available and changes are made by selection of the desired metering system. Provisions are made for changing idle jets, idle air, main system jets, main system air and main system emulsion tube.

Abstract: A modular addition to a modular constructed carburetor is disclosed having a manually adjustable control for selecting any of a plurality of fuel jets. A plurality of jets located in the modular addition are individually selectable from a remote location such as the dashboard of a vehicle allowing the driver to select desired fuel jets for the driving conditions encountered thereby maintaining a measure of control over the air/fuel ratio of the mixture flowing from the carburetor.