Abstract: A carburetor improvement for connecting a link (R) to a movable carburetor part (L3) so the connection is tamper resistant. A swivel (3) has a longitudinal bore (5) extending substantially therethrough and a transverse bore (7) through which the link extends. A clevis (13) comprises a pin (15) insertable through an opening (O) in the movable part. The pin has a head (17) and the diameter of the pin is equal to the diameter of the longitudinal bore in the swivel for the pin to be inserted into the bore. The end of the pin inserted thereinto has a generally U-shaped opening (19) at its end, the length of the opening being greater than the diameter of the link and the width of the opening being equal thereto. The inner end of the longitudinal bore has a decreasing diameter whereby the sidewalls (21) of the U-shaped portion of the pin are pinched together and press against the body of the link to capture the link in the swivel with sufficient force to prevent adjustment of the link.

Abstract: A variable venturi type carburetor includes a suction chamber, a suction piston moveable into and out of the chamber, a metering needle attached to the head portion of the suction piston, the needle being faced by a metering jet. The carburetor also includes a throttle valve. The head portion confronts the venturi section at the upstream side of the throttle valve. The head portion is obliquely cut or shaped at one side, which faces the throttle valve, and desirably is so positioned relative to the throttle valve that at least a portion of the throttle valve pivots during opening movement within space vacated by the obliquely cut or shaped piston portion as the piston moves in an opening direction.

Abstract: A carburetor device for an internal combustion engine is disclosed. The device includes a well adjacent to the intake manifold for holding a quantity of liquid fuel. Perforated tubing is in the bottom of the well, and air under pressure is selectively supplied to the tubing to froth the liquid fuel and produce fuel vapor. The amount of the tubing receiving air under pressure is varied in accordance with fuel demand. The fuel vapor is mixed with ambient air and directed into the intake manifold. The system includes a storage tank for providing the air under pressure, and a pump to supply air to the storage tank.

Abstract: A carburetor choke plate is rotated by a driver in one direction from its wide open position for cold enrichment and in the opposite direction from its wide open position for stoichiometric air-fuel ratio control. A fast idle cam limits throttle closure during operation in the cold enrichment mode, and a stop limits movement of the main metering rod toward its rich position in the stoichiometric air-fuel ratio control mode. The choke mechanism also positions an idle bleed valve to vary idle air-fuel ratio, and controls a latch to prevent secondary operation, during both the cold enrichment and the stoichiometric air-fuel ratio control modes.

Abstract: A carburetor has a fast idle cam with at least two steps being progressively engagable by a throttle stop or abutment secured to the throttle shaft when the chock valve is closed; a lost motion linkage connecting the choke valve and fast idle cam permitting this action to provide for a cold engine start and the coldest fast idle cam setting with the throttle valve idle speed setting at the greatest opening, and a second cold start at a fast idle cam setting intermediate the coldest and a warm setting, to permit the throttle valve to be located in a less open idle speed setting but greater than the normal warm engine setting.

Abstract: An automotive type carburetor has a fast idle cam mechanism that provides a dual path of operation that includes one ramp for engagement with the throttle valve stop screw for progressively closing the throttle valve as a function of temperature increases towards the normal operating level, and a second ramp engagable by the stop screw for automatically indexing the stop screw for an automatic return of the fast idle cam to a high cam step position upon a restart of a cold engine without necessitating any action on the part of the vehicle driver other than to render operable the vehicle ignition system.

Abstract: An automotive type carburetor has a rotatable lever connected to the choke valve and to an actuating link having a pin-slot type connection to an engine vacuum controlled servo, a fast idle cam is connected to the choke lever by a lost motion pin and slot connection and to a second actuating link also connected to the servo by a pin-slot type connection, the servo pin-slot connections to the links are such that when the engine is started with the choke valve closed and the fast idle cam on its high cam step, vacuum applied to the servo during a first stage movement rotates the choke lever to open the choke valve and subsequently during a second stage movement both the choke lever is rotated further and the fast idle cam is rotated off its fast idle step position, to reduce the opening of the throttle valve while opening further the choke valve, the first stage movement of the servo moving a diaphragm and plunger until the plunger blocks a main vacuum feed line to the diaphragm, the second stage movement movin

Abstract: A carburetor for internal combustion engines having a stationary metering element and a rotor assembly which is movable and rotatable with respect to the metering element to control the fuel-air mixture and to thoroughly admix the fuel and air before its passage to the engine.

Abstract: A carburetor for an internal combustion engine. A carburetor body has an induction passage for air to be drawn into the engine. A throttle valve is positioned in the induction passage and is movable between an open and a closed position to control the quantity of air drawn into the engine. A staging valve is positioned in the induction passage and is movable between an open and a closed position. The staging valve is closed during engine cranking and is moved to a first open position when the engine starts and toward its fully open position as the engine warms up. The opening movement of the staging valve is limited to a second open position which is less than its fully open position. The limiting of staging valve movement to this second and less than fully open position limits the usable air capacity of the carburetor to less than its maximum capacity.

Abstract: An improved carburetor for an internal combustion engine, the carburetor being simplified in construction over the prior art carburetors and incorporating versatility through the use of a self-adjusting double venturi which permits the carburetor to operate effectively over a wide range of operating conditions. Parts with bearing surfaces are lubricated by gasoline and are located where they will not be contaminated by dust carried by airflow through the carburetor.

Abstract: A carburetor choke valve or plate is interconnected to a fast idle cam mechanism by linkage having a lost motion permitting continued operation of the fast idle cam subsequent to the choke plate attaining a wide open position.

Abstract: A carburetor for an internal combustion engine. A carburetor body has an induction passage for air to be drawn into the engine. A throttle valve is positioned in the induction passage and is movable between an open and a closed position to control the quantity of air drawn into the engine. A staging valve is positioned in the induction passage and is movable between an open and a closed position. The staging valve is closed during engine cranking and is moved to a first open position when the engine starts and toward its fully open position as the engine warms up. The opening movement of the staging valve is limited to a second open position which is less than its fully open position. The limiting of staging valve movement to this second and less than fully open position limits the usable air capacity of the carburetor to less than its maximum capacity.

Abstract: A carburetor for an internal combustion engine. A carburetor body has an induction passage for air to be drawn into the engine. A throttle valve is positioned in the induction passage and is movable between an open and a closed position to control the quantity of air drawn into the engine. A staging valve is positioned in the induction passage and is movable between an open and a closed position. The staging valve is closed during engine cranking and is moved to a first open position when the engine starts and toward its fully open position as the engine warms up. The opening movement of the staging valve is limited to a second open position which is less than its fully open position. The limiting of staging valve movement to this second and less than fully open position limits the usable air capacity of the carburetor to less than its maximum capacity.

Abstract: A variable stage type carburetor having an intake passage, a throttle valve disposed in the intake passage, and a movable vane disposed at the upstream side of the throttle valve, the movable vane being adapted to cooperate with the wall of the intake passage in constituting a variable venturi and operatively connected to the throttle valve, so as to be moved in response to the movement of the throttle valve. The carburetor further has a first vane controller adapted for displacing the movable vane in the closing direction, independently of the throttle valve, when the venturi vacuum is lowered, and a second vane controller adapted to displace the movable vane in the closing direction, also independently of the throttle valve, when the force exerted by the intake air flow on the movable vane drops below a predetermined level.

Abstract: The pneumatic element which causes partial opening of the choke valve is connected to the intake pipe by a duct having a calibrated restriction. The duct opens into the pipe at a point which is located downstream of the throttle valve under all operating conditions and at another point which is downstream of the throttle when the latter is in the "cold" minimum opening position.

Abstract: A carburetor has an eccentrically mounted fast idle cam the axis of rotation of which is moved by an engine intake manifold vacuum actuated servo to automatically decrease throttle valve fast idle position as soon as the engine obtains a running condition from a cold engine start.

Abstract: A control mechanism for a carburetor having a throttle valve and a choke valve each of which valves has an idling position, a cold-starting position and a full-speed position. The throttle valve is spring-biased towards its idling position and the choke valve is spring-biased towards it full-speed position. Control levers are associated with the respective valves whereby when the choke valve is moved from its idling position towards it full-speed position, a lever member associated with the choke valve engages another lever member associated with the throttle valve and the interengaging lever members hold both valves in their cold-starting position in opposition to the biasing springs.

Abstract: A variable stage type carburetor has a vane controller adapted to forcibly bias a vane to a smaller opening degree when a throttle valve has been opened nearly to the maximum opening degree and, accordingly, the venturi vacuum is small. Between a limiting lever connected to a diaphragm of the vane controller and an interlocking lever connected to the vane, provided is an interlocking spring for affording a relative movement between the vane and the throttle valve. The interlocking spring can be deflected with a reduced force when the throttle valve has been opened nearly to the maximum opening degree.

Abstract: Disclosed herein is a carburetor for internal combustion engines having an automatic choke control mechanism including a vacuum diaphragm assembly operatively connected to a choke lever for opening a spring-biased closed choke valve and holding it open at idling and lower engine speeds and a linkage arrangement interconnecting a throttle valve lever and the choke lever for holding the choke valve open at higher engine speeds independently of the vacuum diaphragm assembly. The linkage arrangement includes a spring-biased choke pull-out lever which is held in a locked position during engine idling and lower engine speeds by a link having one end slidably received in a slot in the choke pull-out lever and the other end connected to the throttle lever.

Abstract: A variable stage type carburetor having a throttle valve and a movable venturi vane cooperative with the throttle valve. This carburetor further includes a negative pressure responsive device for forcedly shifting the venturi vane in a direction to be closed, irrespective of an opening of the throttle valve, when the negative pressure in the venturi portion is lowered to less than a given value, and an accelerator pump for additionally supplying fuel to an intake passage commensurate to the opening action of the throttle valve. The accelerator pump is effectively operated when the opening of the throttle valve remains at an angle no more than a given degree, while the negative pressure responsive device is effectively operated, when the opening of the throttle valve is at an angle no less than a given degree.

Abstract: A device for correcting the mixture ratio of fuel vapors and air for an internal combustion engine is disclosed, which comprises pressure-sensitive members of the barometric sylphon-bellows type and means responsive to the engine temperature of the same type, said two responsive means being connected by a flex transmission means which is kept loose but becomes tightened under certain conditions, such as the last portion of the throttle-opening stroke. The device in question thus effects the correction of the mixture ratio by modifying the density of the air introduced in the engine intake duct.

Abstract: An automotive type carburetor has a choke plate or valve that falls by gravity or is moved by airflow from a closed engine cranking position to a variable number of cold engine running partially closed positions as a function of the differential force between a bimetallic coiled spring and a modulating spring, the positions being independent of engine intake manifold vacuum.

Abstract: A carburetor capable of replacing the conventional carburetor of a poppet-valve type internal combustion engine and making possible satisfactory operation thereof using ordinary diesel fuel atomized under high pressure. After a short warm-up period on regular gasoline, instantaneous switch-over to diesel fuel is made manually or automatically.

Abstract: A fuel control system for an internal combustion engine with an unbalanced sensing vane pivotally disposed in an intake pipe upstream of a throttle valve, an actuating device having a pressure chamber and a movable diaphragm coupled to the sensing vane for actuating the same in response to a pressure applied to the pressure chamber, and a conduit communicating the pressure chamber with the intake pipe between the sensing vane and the throttle valve, a pressure difference responsive valve responsive to a pressure difference across the sensing vane to compensate the pressure applied to the pressure chamber to control the pressure difference across the sensing vane at a constant value irrespective of changes in the amount of intake air, and a fuel metering valve coupled to the sensing vane to meter and distribute fuel in response to the pivotal movement of the sensing vane.

Abstract: A control device for the engine of an engine driven saw having a carburetor with a normally closed fuel control or throttle valve and a normally open starting or choke valve. The device includes a selector member which has a "stop" position in which the engine ignition is disabled and an "operating" position in which the throttle valve is freely adjustable. The selector member also has a "warm start" position and a "cold start" position with the throttle valve being held in a position of minimum opening thereby in each position while the starting valve is held closed by the selector member only in the "cold start" position of the selector member.

Abstract: A flow rate measuring device for an internal combustion engine with an unbalanced sensing vane pivotably disposed in an intake pipe upstream of a throttle valve, an actuating device having a pressure chamber and a movable diaphragm coupled to the sensing vane for actuating the same in response to a pressure applied to the pressure chamber, and a conduit communicating the pressure chamber with the intake pipe between the sensing vane and the throttle valve. The flow rate measuring device further has a pressure difference responsive valve responsive to a pressure difference across the sensing vane to compensate the pressure applied to the pressure chamber, whereby the pressure difference across the sensing vane can be kept constant irrespective of changes in the amount of intake air.

Abstract: A fast-idle cam apparatus in a carburetor having an opening and closing control for forcibly opening and closing a throttle valve, and a mechanism for moving a choke valve and the throttle valve together during engine starting at low temperature, a spring mechanism being interposed in the mechanism so that closing direction movement of the throttle valve can be absorbed therein.

Abstract: In this automatic starting device for internal combustion engine carburetors, comprising a strangler starter shutter, linkage means for controlling this shutter incorporating a temperature responsive element, a cam connected through spring means to said shaft and co-acting with the positive throttle control linkage, said cam having a first cam face controlling the normal idling position of said throttle, followed by another cam face controlling the accelerated idling position thereof, the strangler starter shutter control linkage further comprises resilient connecting means adapted to yield in the fully open position of said shutter, the accelerated idling cam face extending in such a manner that it will still co-act along a predetermined stroke with said positive throttle control linkage after said shutter has reached its fully open position.

Abstract: A variable stage type carburetor provided with a venturi vane which is adapted to vary the venturi area in a venturi portion thereof, commensurate to the opening of a throttle valve. This carburetor features that, in the running condition where the opening of a throttle valve is considerably large and yet the quantity of intake air is relatively less, the venturi vane is forcedly displaced in a direction to be closed so as to increase the venturi negative pressure in the venturi portion, thereby enhancing the injection of fuel.

Abstract: An improved carburetor for an internal combustion engine, the carburetor being simplified in construction over the prior art carburetors and incorporating versatility through the use of a self-adjusting venturi which permits the carburetor to operate effectively over a wide range of operating conditions.

Abstract: A carburetor has a vacuum operated diaphragm type choke control device that acts in connection with a thermostatic control to permit the carburetor choke valve to be closed during starting but provides a controlled gradual opening of the choke valve after starting. An adjustable stop member permits adjustment of the opening by limiting the extent of movement of the diaphragm. The device includes purge feature for continual self-cleaning of the device. A one-way check valve device and precision by-pass means give exact control of the choke opening.

Abstract: A carburetor has a choke apparatus including a pulldown servo to crack open the choke valve a predetermined amount once the engine has attained a running condition, to lean the air/fuel mixture. The conventional bimetallic spring is included to slowly open the choke valve wider. A locking lever is provided to lock the choke valve against return to a more closed position than that attained by the pulldown servo, to prevent stalls due to cold engine loading and loss of vacuum; the lever, however, freely permitting opening of the choke valve and also including means to reset the locking lever so that the engine can be restarted with a closed choke valve.

Abstract: A carburetor has a cold engine fuel enrichment apparatus including a single vacuum servo to progressively first crack open the choke valve a predetermined amount once the engine has attained a running condition, to lean the air/fuel mixture, and then pull the fast idle cam off the high cam step, to decrease the mixture flow to the engine, the apparatus including a slide rail cam connected to the servo and progressively engagable with cam follower surfaces on the choke valve operating linkage and the fast idle cam to accomplish the above-desired functions in an automatic manner.

Abstract: A carburetor has a vacuum servo that actuates a rotatable cam member to automatically rotate the fast idle cam off its high cam step engagement with the throttle valve adjustable idle stop screw while at the same time opening the choke valve to both lean the mixture and reduce mixture volume, for better emission control than when manually controlled as in conventional constructions.

Abstract: In an air valve carburetor, additional fuel for cold start enrichment is provided by a primer pump operated by the throttle when the throttle is opened completely. The primer pump discharges through a jet traversed by the air valve, and the air valve is opened partially to expose the jet when the throttle is opened completely.

Abstract: The carburetor has a fast idle cam latch to prevent movement of the cam to a normal idle speed position, upon throttle valve kick-down operation, when the temperature is below a set level, to prevent engine stalling; the latch consisting of a bimetallic leaf spring in the path of movement of a finger attached to the cam, the spring being movable out of the path of the cam finger when the temperature is above the set level.

Abstract: An air valve type carburetor is described having an enlarged mixing chamber in an induction duct. Fuel is supplied to the mixing chamber at a plurality of annularly spaced locations about the circumference of the mixing chamber. An air valve having an umbrella-shaped disc is positioned at the entrance to the mixing chamber for regulating the flow of the air into the mixing chamber in response to the vacuum pressure prevailing in the mixing chamber. The air valve is designed to direct the air radially outward over the disc and along the periphery of the mixing chamber and to create a pressure depression behind the valve to cause the air to flow radially inward in a turbulent eddy into the central portion of the mixing chamber to thoroughly mix the fuel with the air. Fuel is metered to the mixing chamber in amounts responsive to the manifold pressure, atmospheric pressure and mixing chamber pressure. Additionally, the fuel is premixed with air prior to discharge into the mixing chamber.

Abstract: A carburetor for use in combination with an internal combustion engine has a body with an induction passage formed therethrough; a variable venturi within the induction passage is effective for variably determining the opening of a venturi throat defined thereby; and a throttle valve situated in the induction passage downstream of the variable venturi is operatively connected to the variable venturi for positioning the variable venturi generally in accordance with the position of the throttle valve.

Abstract: A power driven gas aerating carburetor for supplying the combustion chambers of an internal combustion engine with finely atomized air-fuel mixtures in controlled proportions under pressure for more thorough combustion of the air-fuel mixtures.