Abstract: An orifice assembly is detachably attached to a cover serving as a wall surface of an atmospheric chamber. The orifice assembly includes two inner and outer communication ports in a housing thereof. The two inner and outer communication ports are shut out by a partition wall through which an orifice having a small diameter and a communication hole having a diameter larger than that of said orifice, and a check valve is disposed in the communication hole to close the latter therewith. One of the two inner and outer communication ports is communicated with an atmospheric chamber and the other inner and outer communication ports is communicated with the atmosphere. When the pressure in the atmospheric chamber becomes higher than the atmospheric pressure, the communication hole is closed with the check valve, and when the pressure in the atmospheric chamber 48 is equal to or becomes lower than the atmospheric pressure, the communication hole is opened.

Abstract: An attachment for a fuel carburetor possesses a fuel inlet, a needle-and-seat valve disposed in the inlet, and a float attached to the needle-and-seat valve. In one embodiment, the attachment is placed between and is in fluid communication with both the float bowl and the metering block of a typical carburetor. Fuel is pumped into the float bowl and the attachment in parallel from the fuel pump. The float in the attachment rises and falls according to the level of fuel in the interior of the attachment and float bowl, and thus regulates the position of the needle-and-seat valve, which in turn regulates how much fuel is pumped into the attachment and float bowl. The attachment is also provided with a device for injecting a spurt of fuel directly into the metering block to avoid lean fuel conditions when the throttle is initially opened. In an alternative arrangement, the float bowl and attachment are made as one integral unit.

Abstract: A carburetor float bowl is provided which is elongated in a direction lengthwise of the vehicle and has a smooth upwardly curved section on the bottom wall at the front and rear ends of the float bowl to minimize sloshing of the gasoline and also minimize foaming of the gasoline within the float bowl during severe back and forth rocking movement of the carburetor as would occur in a motorcycle passing over a series of bumps at a high speed.

Abstract: A carburetor of the "HOLLEY" 4150 or 4500 series is modified to double the fuel intake capacity thereof, to limit fuel sloshing in the float bowls thereof, to provide an upper fuel transfer passage between a pair of fuel inlet passages for each float bowl, to enable ready removable and replacement of the main jets independent of removable of the float bowls and to provide alternate main jet fuel pickup zones in different plan areas of the bottom of the float bowls.

Abstract: An adaptor (27) is provided in the float bowl (11) of a carburetor (10) to force the secondary fuel passage (18) to draw fuel from the center of the float bowl (11). A cap (31) is provided at the top of the adaptor (27) to seal the top of the adaptor (27) while allowing the secondary metering rods (19) to extend through the adaptor (27).

Abstract: A fuel controller has a fuel cut-off device in the form of a solenoid valve connected to an intermediate part of an air bleed commmunicating with the well of a variable choke carburetor. The fuel controller also employs a vacuum changeover valve which communicates with the engine intake manifold through a passage way and is connected to the air bleed between the solenoid valve and an air jet upstream of the solenoid valve. The solenoid valve is opened when the engine is decelerating in order to allow the well and the air bleed to communicate with each other, thereby controlling the air-fuel ratio. When the key switch is IC, the air bleed and the vacuum changeover valve communicate with the well, thereby cutting the supply of fuel to the mixing chamber.

Abstract: A sliding throttle valve type carburetor comprising a sliding throttle valve, an air intake passage and a fuel float chamber, the sliding throttle valve extending along a line of intersection with the intake passage and being disposed at an acute angle relative to the portion of the intake passage upstream from the sliding throttle valve. The sliding throttle valve forms an angle of intersection with the portion of the fuel surface in the float chamber upstream from the sliding throttle valve which is greater than the aforementioned acute angle.

Abstract: A carburetor for internal combustion engines, comprising an intake cylinder having an intake passage, a float chamber projecting from a lower side of the intake cylinder and capable of being filled with a fuel, floats provided in the float chamber for vertical movement in accordance with the change in the level of the surface of the fuel therein, a float valve adapted to open and close in accordance with the movements of the floats to maintain the fuel surface at a predetermined level, and a fuel passage for introducing the fuel in the float chamber into the intake passage, wherein that portion of the fuel passage which extends into the float chamber is inclined with respect to the axis of the intake passage, the floats are movable in parallel with the axis of the mentioned portion of the fuel passage, which extends into the float chamber, in accordance with the change of the level of the fuel surface in the float chamber.

Abstract: A carburetor including a main fuel system and a low-speed fuel system having a throttle valve shaft located parallel to a row of cylinders located in side-by-side relationship substantially perpendicular to the direction of movement of a vehicle. The carburetor is connected to a suction manifold in such a manner that a float chamber is interposed between the throttle valve shaft and the row of cylinders.

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: An improved carburetor metering block for converting a conventional gasoline carburetor to alcohol fuel involving a carburetor metering block means adapted to attach to a conventional carburetor and replace the removable fuel bowl and standard metering block wherein the improved carburetor metering block means is adapted to accept, simultaneously, a plurality of individual and separate fuel bowls. Such a device can inexpensively convert a conventional carburetor to the use of alcohol fuel consistent with sufficient fuel flow and adequate fuel level control.

Abstract: A carburetor for internal combustion engines of motor vehicles, having a suction conduit supplied with fuel from a float chamber in which the fuel is kept at a constant level by a needle valve actuated by a pair of floats. The float chamber has vertical side walls and the outer surfaces of the floats, particularly those facing the walls of the float chamber, are also vertical. A main jet is located on a vertical line passing through the center of gravity of a plane figure defined by sectioning a horizontal plane by a spatial figure defined between the inner walls of the float chamber and the outer surfaces of the floats. The main jet is supported by a columnar structure having vertical walls, suspended from the cover of the carburetor and accommodating the main and idling circuits of the carburetor.

Abstract: A float chamber is defined within a body, which is also formed with an inlet passage for supplying fluid into the float chamber, and an outlet passage for taking fluid out from the float chamber opening into a lower part of the float chamber. A float is mounted within the float chamber so as to be movable up and down, and acts on a fluid valve for controlling fluid flow into the float chamber through the intake passage, causing the valve to open and close. The shapes of the float and the float chamber are such that the amount of fluid required to be present in the float chamber in order to float the float at the position in which it just causes the valve to be closed, in equilibrium between its weight and the buoyancy force exerted by the fluid, is independent of the angle of tilting of the float chamber within a certain tilting range.

Abstract: A fuel supply system for a small engine including a constant level fuel chamber for receiving fuel from a fuel tank through a fuel drawing pipe to eject the fuel into a carburetor through a main nozzle after temporarily storing the fuel therein. A cover is provided to enclose the fuel drawing pipe and the constant level fuel chamber to separate the fuel drawing pipe and the constant level fuel chamber from a fuel storing section in the fuel tank, to enable fuel of a constant flow rate to be fed to the carburetor through the main nozzle irrespective of variations in the liquid level in the fuel storing section.

Abstract: An overflow device for a vehicular carburetor. The carburetor includes a float chamber in which a maximum level is to be maintained. A drainage tube drains fuel at higher levels to a reservoir at an elevation lower than the carburetor. A vent tube vents the reservoir at an elevation higher than the carburetor. The reservoir can be heated by engine heat to evaporate excess fuel.

Abstract: A carburetor for a multi-cylinder internal combustion engine which has for each cylinder a main combustion chamber defined above the piston in the cylinder and a sub-combustion chamber defined above the main combustion chamber and communicating with the latter through a torch nozzle. The carburetor has a main intake passage and a sub-intake passage for supplying a comparatively lean mixture and a comparatively rich mixture to the main and sub-combustion chambers respectively. The carburetor has a single throttle valve shaft extending across the main and sub-intake passages with a main throttle valve and a sub-throttle valve mounted on the valve shaft and disposed in the main and sub-intake passages respectively.The main and sub-throttle valves are attached to the single throttle valve shaft at the same attaching angle and have respective parallel surfaces and outer peripheral edge surface.

Abstract: An apparatus to control a liquid level in a carburetor with a fuel chamber formed in a main body of the carburetor. A level detecting element, i.e., thermistor, in the upper portion of the main body produces an electrical signal in response to liquid level, opens and closes an electromagnetic valve. Inflow of the fuel to the chamber is thereby controlled. A small chamber is formed in the fuel chamber by a partition for insertion of the detecting element.

Abstract: A carburetor for a multi-cylinder internal combustion engine which has for each cylinder a main combustion chamber defined above the piston in the cylinder and a sub-combustion chamber defined above the main combustion chamber and communicating with the latter through a torch nozzle. The carburetor has a main intake passage and a sub-intake passage for supplying a comparatively lean mixture and a comparatively rich mixture to the main and sub-combustion chambers respectively. The carburetor has a single throttle valve shaft extending across the main and sub-intake passages with a main throttle valve and a sub-throttle valve mounted on the valve shaft and disposed in the main and sub-intake passages respectively. One of the main and sub-throttle valves has an outside diameter smaller than the inside diameter of the associated intake passage so that the ratio of the open areas of the main and sub-intake passages is not constant as the throttle shaft is operated.

Abstract: A removable manifold for use with a high performance carburetor having a plurality of jets for supplying separate barrels of the carburetor with liquid fuel from a reservoir, the manifold being in the reservoir extending between and encapsulating the jets to generally equalize the flow of fuel from the reservoir to each jet, regardless of the angle of the fuel level in the reservoir.

Abstract: A carburetor for an internal combustion engine comprises a control for maintaining the pressure of the fuel supply through the carburetor constant. The control includes a sensing device, which is preferably a level sensing device, and a fuel feed valve which is automatically operated by the sensing device. The sensing device produces signals which operate the valve to control the rate of fuel supply to the carburetor and, in order to provide an indication of the instantaneous rate of fuel consumption of an engine to which the carburetor is fitted, these signals are also fed to a fuel flow indicator. The fuel flow indicator produces a reading of the fuel flow rate either in dependence upon the frequency of opening of the valve when the opening period is constant, or in dependence upon the period for which the valve is open when the frequency of opening of the valve is constant.

Abstract: An ultrasonic humidifier comprising an atomizing chamber 2 containing water which is atomized by an ultrasonic vibration board 4 to be discharged therefrom. A water supply tank 11 is provided with a valve rod 14 having a valve 15 adapted to close a water outlet 13 thereof. The valve rod 14 protrudes by the elastic force of a spring. A water supply tank chamber 5 which, when said water supply tank is mounted therein with the valve rod 14 directed downward, relatively depresses the lower end of the valve rod with the bottom thereof to open the water outlet 13. A valve rod receiving chamber 6 communicates with the tank chamber. The water level of the atomizing chamber 2 is equal to the level of said water outlet 13 of the water supply tank which confronts with the valve rod receiving chamber 6. A water delivering path (17a or 17b) establishing communication between the valve rod receiving chamber 6 and the atomizing chamber is bent and elongated in a horizontal plane thereof.

Abstract: A baffle device in the fuel bowl of the carburetor of a vehicle maintains the level of fuel in the fuel bowl constant regardless of erratic movement of the vehicle.

Abstract: The invention provides a carburetor comprising a float chamber, a throat and a fuel duct extending between the chamber and the throat and from which duct, subject to the below, fuel could overflow to the throat on tilting of the carburetor occurring; and wherein the carburetor is characterized in having a weir communicating, on one side, with the float chamber and, on the other side, with fuel collecting means and over which weir fuel can flow on such tilting occurring whereby to at least in part reduce overflow of fuel through said duct to the throat in consequence of such tilting.The carburetor may be made such in initial manufacture or an existing carburetor may be modified.A device for modifying a carburetor is also provided.

Abstract: A carburetor assembly for stratified charge combustion type engines wherein a rich set carburetor and a lean set carburetor are arranged such that a substantially straight line connects together the centers of an inlet bore of the rich set carburetor and inlet bores of a primary side carburetor and a secondary side carburetor of the lean set carburetor as seen from above. The rich set carburetor is disposed adjacent the primary side carburetor of the lean set carburetor and formed integrally therewith. A float chamber is arranged such that the center of its inclination is disposed in the vicinity of the center line between the main fuel nozzles of the primary side carburetor and the secondary side carburetor. An open end of the main fuel nozzle of the rich set carburetor is disposed at a level higher than open ends of the main fuel nozzles of the primary side carburetor and the secondary side carburetor of the lean set carburetor.

Abstract: An improved carburetor for vehicle engines of the down draft type having a suction duct connected to an intake manifold, a float chamber storing a predetermined constant quantity of engine fuel and arranged on one side of the suction duct in the transverse direction of a vehicle equipped with the carburetor, and a vertically extending fuel passage connected at one end to the float chamber and at the other end to a main fuel nozzle opening into the suction duct, the carburetor being capable of holding the fuel contained in the fuel passage at all times at a predetermined constant level for highly stabilized fuel supply to the engine irrespective of lateral or longitudinal inclinations of the fuel surface in the float chamber occurring under conditions of acceleration, deceleration or turning of the vehicle.

Abstract: A fuel carburetor structure is shown having a main fuel bowl or reservoir with a second fuel reservoir therein; a fuel inlet valve assembly for controlling the rate of fuel flow to both the main and second or auxiliary reservoirs is shown as having a needle-like inlet valve positioned by a float carried within the main reservoir and responsive to the level of the fuel contained therein; additional valving means resiliently resists the flow of fuel into the main reservoir and the degree of such resilient resistance is reflective of the degree to which the needle-like inlet valve has been moved toward its fully closed position; the additional valving means also serves to cause a flow of fuel from the needle-like inlet valve to the auxiliary reservoir via related conduit means.