Abstract: A facultative lagoon, an airlift aerator for such a lagoon, and a method of operating such a lagoon. The aerator includes a U-shaped body with a down flow leg and an airlift leg and a float. The float sustains the U-shaped body with respect to the surface of polluted material contained in the lagoon. The upper ends of the legs are submerged slightly beneath the surface of the material in the lagoon. The down flow leg has a water inlet and the airlift leg has the water outlet. A bubble generator is connected to a lower portion of the airlift leg. Air supplied under pressure to the bubble generator introduces bubbles into the airlift leg which establishes a water circulation through the U-shaped body. Bubbles transfer oxygen to the passing water which is disbursed through the water outlet. The dissolved oxygen is used in the biodegradation of the hazardous and odorous gases of the waste material that would otherwise be emitted into the atmosphere.

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: The present invention serves to facilitate atomization of fuel in a diaphragm type carburetor for all-purpose two-cycle engines. A check valve used to prevent back flow is installed in the fuel passage leading from a constant-fuel chamber to a main nozzle, and an air bleed passage is connected at a position on the downstream side of the check valve. The main nozzle is constructed by forming nozzle openings which face downstream with respect to the engine intake air flow. The nozzle openings are located in a tubular member which cuts across a central axial line of the venturi so that the tubular member bridges the neck of the venturi.

Abstract: A fuel delivery system for an internal combustion engine. The fuel delivery system includes a carburetor housing having an air passage with a throttle valve disposed therein. A choke lever is movably mounted to the carburetor housing for restricting air flow into the air passage. A fuel injection device is provided for injecting fuel into the air passage before the engine is started. Movement of the choke lever to an engaged position simultaneously opens the throttle valve, restricts air flow into the air passage and activates the fuel injection device to inject a predetermined volume of fuel into the air passage. The air-flow restriction and the predetermined volume of fuel are adjusted to compensate for changes in ambient temperature.

Abstract: A diaphragm carburetor for an internal combustion engine of a portable hand-held working tool has a housing with a control chamber. A suction channel extends through the housing and has a venturi section. An inlet valve is connected to the control chamber and supplies the control chamber with fuel. A main valve channel connects the control chamber to the venturi section of the suction channel. A check valve is positioned in the main valve channel adjacent to the control chamber and closes the main valve channel toward the control chamber. The main valve channel has a straight and elongate portion extending from the check valve into the venturi section and projecting into the suction channel.

Abstract: The invention is directed to a membrane carburetor which includes an intake channel having a throttle flap which is pivotally journalled. The carburetor also includes a control chamber from which fuel can be supplied to the intake channel. A valve is mounted in an ancillary channel and a corresponding adjustment of the throttle flap results in dependence upon the opening and closing position.

Abstract: Fuel supply system (1) for internal combustion engines, arranged in a suction channel (2) leading to the engine body proper, the system (1) comprising one or several air-regulating valves (5,6) and one or several nozzles (3,3'). A cavity (7) or channel is provided in the wall of the suction channel (2) and is positioned in such a manner that when the air-regulating valve (5,6) assumes its closed position the cavity or the channel creates a communication path (21) from one side of the air-regulating valve to the other one, and in that an at least partly movable body (8) is positioned adjacent the cavity (7) or channels in such a manner as to be able to affect the through-flow resistance in the communication path (21). The position of the movable body (8) is controlled by a temperature-responsive member (9), for instance a bimetal element.

Abstract: A variable venturi carburetor, which is part of an intake system of an internal combustion engine, includes structural features which allow an air intake path of the carburetor to be shortened, and which allow the size of air chambers of the carburetor to be reduced. A piston valve is composed of a plate-shaped valve and a tubular portion. The plate-shaped valve is guided by a pair of grooves provide in sidewalls of the intake path. The tubular portion is attached to one side of the plate-shaped valve near a center of the side of the plate-shaped valve. The tubular portion has a rectangular or square cross-section. Each side of the rectangular cross section is shorter than the internal diameter of the intake path. A flange is attached to an upper end of the piston valve. The flange is of a reduced diameter and facilitates connection of the piston valve to a diaphragm.

Abstract: A fuel delivery system for an internal combustion engine. The fuel delivery system includes a carburetor housing having an air passage with a throttle valve disposed therein. The air passage has an inlet and an outlet. The outlet is in communication with the engine. Means are provided for simultaneously opening the throttle valve, restricting air flow into the air passage and injecting a predetermined volume of fuel into the air passage before the engine is started. Other means are provided for automatically adjusting the restriction of air flow and the predetermined volume of fuel to compensate for changes in ambient temperature.

Abstract: An accelerator having a main body defining a main chamber, a movable member (e.g., a diaphragm) positioned within and dividing the main chamber into a pneumatic chamber and a fuel chamber, and a damping orifice (e.g., in the main body) interconnecting the pneumatic chamber with a gas source (e.g., ambient air). The damping orifice has a cross sectional area less than about 0.002 square inches. To inhibit contamination of the accelerator, a filter can be operatively positioned between the pneumatic chamber and the ambient air.

Abstract: A perfume dispenser includes a housing, a fan and a perfume respectively mounted in the housing at different elevations and separated by a partition wall, the housing having clamping plates for mounting in louvers of an air output port of an air conditioner, a first air inlet adapted for guiding currents of air from the air conditioner into the fan chamber to turn the fan, a second air inlet adapted for guiding outside air into the perfume chamber, and a plurality of air outlets adapted for guiding air out of the fan chamber, the partition wall defining an air passage through which air passes from the perfume chamber to the fan chamber.

Abstract: An electronically controlled type floatless carburetor includes a fuel regulating chamber from which fuel is delivered to a main fuel passage including a main jet and a pilot fuel passage including a pilot jet as a main diaphragm is actuated. A main solenoid valve is disposed at the intermediate position of the main fuel passage located on the downstream side of the main jet. In addition, a pilot solenoid valve is disposed at the intermediate position of the pilot fuel passage located on the downstream side of the pilot jet. Operation of each of the main solenoid valve and the pilot solenoid valve is controlled by an electronic controlling circuit into which various parameters are inputted so as to assure that main fuel and pilot fuel are ejected in a suction passage from a main nozzle and a slow system ejection port while they are well adapted to all operational states of an engine.

Abstract: An electronically controlled type floatless carburetor includes a fuel regulating chamber from which fuel is delivered to a main fuel passage including a main jet and a pilot fuel passage including a pilot jet as a main diaphragm is actuated. A main solenoid valve is disposed at the intermediate position of the main fuel passage located on the downstream side of the main jet. In addition, a pilot solenoid valve is disposed at the intermediate position of the pilot fuel passage located on the downstream side of the pilot jet. Operation of each of the main solenoid valve and the pilot solenoid valve is controlled by an electronic controlling circuit into which various parameters are inputted so as to assure that main fuel and pilot fuel are ejected in a suction passage from a main nozzle and a slow system ejection port while they are well adapted to all operational states of an engine.

Abstract: A hand-guided, portable tool includes a housing and an internal combustion engine mounted in the housing. A fuel tank is mounted in the housing. The internal combustion engine has a carburetor with induction port for preparing a fuel/air mixture. An air filter is mounted in the housing. The air filter has a clean air side that is connected to the induction port. The internal combustion engine also has a control chamber with inlet valve. The control chamber is filled with fuel supplied thereto via the inlet valve from the fuel tank. The control chamber supplies fuel to the carburetor. The internal combustion engine has a compensation chamber delimited on one side by a control diaphragm that controls the inlet valve. The compensation line connects the compensation chamber to the clean air side of the air filter. The compensation line has a first connection section connected to the clean air side of the air filter and a second connection section connected to the compensation chamber.

Abstract: A down-drafting constant vacuum pressure type diaphragm carburettor includes a carburettor body with an induction passage, a throttle valve, a Venturi portion variable of open area. A vacuum actuated valve is arranged at upstream side of the throttle valve across the induction passage and extending in horizontal direction from one side to the other side, and controls an open area of a Venturi portion depending upon a vacuum pressure generated in the Venturi portion. A jet needle is mounted on the vacuum actuated valve. A fuel control system including a diaphragm arranged between a recessed portion of the carburettor body and a cover covering for defining a regulator chamber at the side of the recessed portion and an atmospheric pressure chamber at the side of the cover, and a valve seat. The diaphragm is arranged at lower side of a longitudinal axis of the jet needle.

Abstract: A carburetor for a two or four stroke engine having a diaphragm chamber for supplying fuel to the air intake passage of the engine, and a reservoir for primer fuel. A manually operable pump or bulb draws fuel from the diaphragm chamber into the reservoir. An outlet passage leads from the reservoir to deliver primer fuel to the engine. A normally closed manually operable valve or button is provided for opening the outlet passage. The capacity or the reservoir is varied as a function of ambient temperature by a temperature compensator.

Abstract: A carburetor start pump circuit, for starting an engine, has an auxiliary fuel pump mounted on a relatively standard carburetor body, a pulse passageway extending through the carburetor body to the auxiliary fuel pump, and a fuel circuit having an intake side extending from a metering chamber in the carburetor body to the auxiliary pump where it is interconnected to a discharge side extending from the auxiliary pump to a throttle bore in the air intake of the carburetor body. To facilitate control of fuel flow, the fuel circuit includes inlet and discharge check valves and a metering jet.

Abstract: A crankcase fuel injection system includes a diaphragm type fuel pump, a crankcase fuel injector assembly, and a main air inlet assembly. Engine crankcase pulses generated by the up and down movements of the piston are utilized by the fuel pump to replenish the fuel mixture in a fuel mixture injector chamber of the fuel injector assembly. The air mass entering the crankcase upon the upstroke of the piston is controlled within the main air inlet assembly by a throttle valve and metered across a main air venturi. The venturi signal at the main air venturi is amplified by a booster venturi. The amplified venturi signal is applied to a middle chamber formed between the two diaphragms of the compound diaphragm assembly which serves as the injector pump mechanism. The force acting upon the diaphragm assembly due to the amplified venturi signal is further amplified due to the area relationships of the two diaphragms.

Abstract: This invention provides a means of achieving the close control of iodine flow rate, temperature of the resulting combined gaseous mixture of iodine in diluent gas, as well as the rapid start and stop response time needed for full-scale laser operation. It comprises an iodine charge stored as a solid and is heated to converted the iodine to a liquid, a means to heat the iodine under pressure to extend the liquid temperature range of iodine, an atomizer for complete vaporization of the iodine, a helium iodine mixer to provide heat for iodine vaporization purporting iodine to helium proportion mass ratio and provides for complete mixing and a flow control system which controls the low iodine flow rates accurately.

Abstract: A diaphragm carburetor for an internal combustion engine has a housing and a control chamber positioned in the housing and having a fuel inlet valve. A control diaphragm is positioned in the control chamber. A Venturi channel extends through the housing. At least one throttle valve is positioned in the Venturi channel. An idle valve and a main valve open into the Venturi channel and are connected with an idle valve channel, respectively, a main valve channel to the control chamber. A fuel pump is positioned in the housing. A fuel channel connects the fuel pump and the fuel inlet valve of the control chamber. A control lever that is actuated by the control diaphragm for controlling the fuel inlet valve is provided. The fuel inlet valve has a valve seat and a valve member with a sealing member cooperating with the valve seat for opening and closing the fuel inlet valve. The sealing element has a flat end face. The valve member is connected to the control lever.

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 electronically controlled type floatless carburetor includes a fuel regulating chamber from which fuel is delivered to a main fuel passage including a main jet and a pilot fuel passage including a pilot jet as a main diaphragm is actuated. A main solenoid valve is disposed at the intermediate position of the main fuel passage located on the downstream side of the main jet. In addition, a pilot solenoid valve is disposed at the intermediate position of the pilot fuel passage located on the downstream side of the pilot jet. Operation of each of the main solenoid valve and the pilot solenoid valve is controlled by an electronic controlling circuit into which various parameters are inputted so as to assure that main fuel and pilot fuel are ejected in a suction passage from a main nozzle and a slow system ejection port while they are well adapted to all operational states of an engine.

Abstract: A drying bed for waste sludge in a wastewater treatment facility having a vertical drainage riser extending vertically from a subnatant discharge pipe near the bottom of the drying bed. A sludge inlet at an end of the drying bed communicates with a source of watery sludge. Water communicates through a mesh screen that wraps the vertical drainage riser and through openings in the vertical drainage riser to the subnatant discharge pipe. A valve is selectively opened to control the flow rate of the water from the subnatant discharge pipe. A method of dewatering waste sludge is disclosed. The wastewater treatment facility provides a mixing/balancing chamber for initial mixing of activated return sludge with influent wastewater for aggressive assimilation of wastes and an improved airlift for removal of suspended solids in the wastewater. The airlift comprises a solids evacuation pipe having a lower open end for receiving solids, an upper open end for exiting solids, and a midsection defining a series of holes.

Abstract: A construction of a fuel supply pipe with a proximal end press-fit portion formed of metal and a metering tip portion formed of synthetic resin. The metering tip portion, formed with a fuel jet therein, is telescopically connected to the proximal end press-fit portion of the fuel supply pipe to provide a stable fuel supply in a rotary throttle valve type carburetor.

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: To improve a carburetor including a main housing portion (12), in which a Venturi tube (2) and a throttling part (2a) are defined and which has an air intake side and an engine exit side, and a fuel pump (5) to the effect that, on the other hand a better starting procedure is provided and, on the other hand, the carburetor and, consequently, the engine are reliably prevented from getting flooded, it is suggested to supply fuel to the fuel pump (5) via a fuel intake (8) which is connected to the fuel tank (63) through a fuel line (64), and a fuel vapor supply (or vent) line (60) is provided which with its one end (61) is connected to the fuel intake feed channel (28) and with its other end (62) is connected to the fuel tank (63), and that in the route of the fuel vapor supply line (60) a check valve (66) is provided.

Abstract: Apparatus for producing and dispensing a product comprises a mixer which has a first inlet for receiving a liquid, a second inlet for receiving a fluid, and an outlet. A relatively long continuous turbulence passage of relatively small cross section has one end positioned to receive the effluent from the mixer outlet and its other end spaced from the mixer outlet so that the effluent is subjected to confined turbulent mixing in the turbulence passage until the fluid product is discharged from the passage other end. If that product is to be cooled, the turbulence passage leads to a cooling area which cools and at least partially freezes the fluid product issuing from that passage. A method of producing the product is also disclosed. The invention has particular application to the making and dispensing of frozen yogurt and ice cream and allows for the serving of individualized fresh portions in a variety of flavors and with little required cleaning.

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: An arrangement in an internal combustion engine comprises a membrane carbureter (10) having a fuel chamber (12) provided with a movable membrane (11) cooperating with a valve (17) for controlling the fuel supply to said fuel chamber. The air inlet of the carbureter is connected to a filter housing (31) provided with an air filter (32) for cleaning the inlet air, and a pressure chamber (13) is disposed adjacent said membrane and connected to said filter housing to control the fuel supply in relation to the pressure drop across said air filter (32). According to the invention, the membrane (11) is arranged in parallel with a wall (33) of the filter housing, and said wall is disposed adjacent to the pressure chamber (13) and provided with an opening (34) via which said pressure chamber communicates with the interior of said filter housing.

Abstract: A diaphragm-type carburetor has a high speed adjusting needle and a low speed/idle adjusting needle which are independently supplied with fuel from the metering chamber. The path for fuel to the low speed/idle needle has a valve which is controlled by the angular position of the throttle shaft such that when the throttle shutter is closed the valve is open whereas when the throttle shutter is open the valve is closed.

Abstract: A closed loop fuel supply system for operating engines in all possible attitudes in which fuel is delivered by a vacuum pump responsive to the vacuum level in the crankcase of the engine and in which the vacuum driving the pump is modulated in response to the pressure of fuel being delivered to the fuel supply system so that the amount of fuel delivered for combustion purposes is equal to the requirements of the engine without any excess. In another embodiment, the delivery of pulsating fuel is dampened to obtain a uniform fuel delivery and distribution to the combustion chamber is under the control of three shutoff valves operating throughout the speed range of the engine. In each embodiment fuel is conserved and a fuel return line is not required.

Abstract: A method and apparatus is provided for long-term extracorporeal preservation of living tissue. A tissue preservation device including a gas permeable membrane and perfusate allows oxygenation of the living tissue. The gas permeable membrane allows gas from a cyclically pumped source to permeate and expand the membrane, simultaneously oxygenating the perfusate and pumping the oxygen-enriched perfusate through the tissue. Simply constructed of a few basic components, the tissue preservation device is capable of operating in many physical orientations, and requires no electrical power for operation. Also provided is an apparatus for cooling and transporting the tissue preservation device.

Abstract: A closed loop fuel supply system for operating engines in all possible attitudes in which fuel is delivered by a vacuum pump responsive to the vacuum level in the crank case of the engine and in which the vacuum driving the pump is modulated in response to the pressure of fuel being delivered to the fuel supply system so that the amount of fuel delivered for combustion purposes is equal to the requirements of the engine without any excess so that a fuel return line is not required.

Abstract: The invention is directed to a membrane carburetor for an internal combustion engine such as a two-stroke engine having an intake for drawing the mixture in by suction. The membrane carburetor has a venturi section wherein the mixture is formed. A main nozzle opening opens forward of a throttle flap and an idle nozzle opening opens rearward of the throttle flap both viewed in flow direction. Both openings are connected via channels to a fuel-filled control chamber to which fuel flows via an inflow channel. An inlet valve is mounted in the inflow channel and has a valve body disposed opposite a valve seat fixed in the housing. The inlet valve is actuated in the opening direction via a control lever by a control membrane delimiting the control chamber.

Abstract: An engine for a portable working machine includes a carburetor having a fuel supply device which is to be operated by an intake pipe of a cylinder head provided with an intake valve and an exhaust valve, and a pulse pickup passage which is in fluid communication with the carburetor and which is connected to an inner wall of the intake pipe. The passage is provided at a connection portion between the intake pipe and the carburetor.

Abstract: A synthetic composite flexible diaphragm of a fabric of warp-knitted polyester fibers and an elastomeric polymer coating applied only to one side of the fabric and disposed in interstices between the fibers to provide when cured a barrier at least substantially impervious to liquid fuel.

Abstract: A diaphragm carburetor with both the main metering nozzle and an idle circuit supplied with liquid fuel from the same metering chamber and an accelerator and shut-off assembly in the idle circuit. The assembly has a valve which is open to supply fuel to the idle circuit when the throttle is in a closed idle position and closes off the supply of fuel from the metering chamber as the throttle is moved to its wide open position. Opening of the throttle also actuates a piston to supply additional fuel for accelerating an engine.

Abstract: An internal combustion engine with a diaphragm carburetor which provides additional fuel injection in all starting and environmental conditions. The carburetor is provided with a fuel recirculation line which communicates at one end with the fuel feed line of the carburetor, and which communicates at the other end with the fuel tank. The recirculation line is also provided with a choke for flow resistance.

Abstract: Method, system and apparatus for metering fuel to an internal combustion engine via a carburetor having a mixture conduit with a venturi therein. A main fuel nozzle supplies fuel to the venturi of the carburetor in response to the static pressure drop induced across an associated main fuel flow controlling restriction by the engine intake induced air flow through the carburetor mixture conduit. A pitot tube is disposed in the venturi with an opening facing upstream in a zone of maximum air flow through the carburetor venturi. A vent passageway system connects the pitot tube to a single closed air chamber cooperable with either a diaphragm or a float to regulate operation of an inlet valve controlling flow of fuel to a main fuel controlling restriction.

Abstract: A carburetor priming system for an internal combustion engine including a flexible bulb which is actuable in a first manner to permit displacement of a one volume of fluid and in a second manner to permit displacement of a second and lesser volume of fluid. Actuation of the bulb in the first manner provides a high volume prime for providing fuel enrichment to a carburetor that has been run dry of fuel. Actuation of the bulb in a second manner provides a normal volume prime.

Abstract: The invention relates to a membrane carburetor having an air filter connected upstream of the intake channel. The combustion air passes through the air filter and into the intake channel of the carburetor and coacts with the fuel drawn into the intake channel to form a fuel/air-mixture which enters the combustion chamber of the engine communicating with the intake channel. The compensation chamber of the carburetor is connected exclusively to the clean-air side of the air filter in order to avoid an overenrichment of the mixture when the filter material of the air filter becomes contaminated. The membrane carburetor can be used on two-stroke engines for portable handheld tools such as motor chain saws, cutoff machines, brushcutters or the like.

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 precooler for enhancing the cooling effectiveness and efficiency of an existing evaporative cooling system employing a misting system for precooling the ambient air before entering the air flow inlet to the evaporative cooler.

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 invention is directed to a control membrane of a carburetor including a carburetor chamber containing fuel. The control membrane defines a wall of this chamber and has a reinforcement portion in the center region thereof. This reinforcement portion transmits the membrane stroke to a controller lever. The control membrane provides for a simpler manufacture thereof and achieves a better functional reliability. The control membrane together with the reinforcement portion are configured as a one-piece component.

Abstract: An arrangement for limiting the temperature in a carburetor etc. of an engine prevents evaporation of fuel at a temporary stop in the operation of the engine. A receptacle (30) integrated with the carburetor contains a material (31), e.g. paraffin, with a melting point over the normal operating temperature. At a temperature above this melting point the material absorbs melting heat from the environment causing a limitation of the temperature. In this limited temperature the fuel evaporates much slower and a direct start with the remaining fuel after the operating stop is quite possible.

Abstract: The invention is an arrangement for controlling the air/fuel ratio A/F in a carburetor. The arrangement can be connected to a membrane or a float carburetor and controls the mixture ratio by influence on the differential pressure .DELTA.p between the fuel chamber (18) and the venturi (12). The subpressure from some part of the intake system (16) is passed through a magnetic valve (32) activated by pulses of a variable length. In order to equalize the whole or part of the subpressure there is an opening (33) with inlet from the atmosphere to the valve. By varying the pulse length a changeable subpressure is obtained which is connected in lieu of the regular atmospheric ventilation of the carburetor.

Abstract: The invention relates to a carburetor for an internal combustion engine and especially for a portable small engine. The carburetor includes a carburetor housing defining an intake pipe and a control chamber which communicates with the intake pipe via intake channels. A fuel-feed line which is closable by an inlet valve opens into the control chamber. The inlet valve includes a valve seat formed in the fuel-feed line and a valve body mounted on a positioning lever which is connected to a membrane defining a wall of the control chamber. The positioning lever can be pivotally actuated to open the inlet valve to admit fuel into the control chamber. An actuating lever is pivotally mounted on the carburetor housing and can be pivoted from a rest position to an active position whereat the actuating lever applies a force against the membrane to displace the latter and pivotally actuate the positioning lever to immediately open the inlet valve when starting the engine.

Abstract: In a charge forming apparatus comprising fuel supply means including an idling orifice and a low speed orifice for feeding the amount of fuel required during the period that an engine is idling or running at a low r.p.m. and a supplemental fuel passage for guiding the fuel to such orifices and an air feeding bypass for keeping the engine idling, the supplemental fuel passage is connected to a portion of the bypass upstream of a manually operable valve for regulating the flow rate of air by means of a connecting path. A negative pressure generated on the engine side rather than on a throttle valve makes negative the supplemental fuel passage and the bypass, but a negative pressure on the upstream side of a valve of the bypass varies in correspondence with the effective path area varied by the valve.

Abstract: A motorless continuous carbonator including a double acting piston type water pump driven by a double acting piston type gas pump actuator assembly powered by the carbonating gas. A connecting rod couples the pump piston with the actuator piston and includes means for operating a toggle switch mechanism for controlling a pair of solenoid valves respectively connected to the pump and actuator assembly for controlling the flow of water and carbonating gas, typically CO.sup.2, therefrom and thus deliver still water and CO.sup.2 to a semi-permeable membrane carbonator. The CO.sup.2 gas which initially provides the pumping force is subsequently fed to the carbonator where it is absorbed by the still water to form carbonated water which is then fed to a dispensing unit which may be either a post-mix dispenser utilized either on earth or in a microgravity environment.