Abstract: An electrode humidifier device having a cartridge and a reconfigurable steam nozzle, connected to the cartridge that may be changeable between a direct and a remote mounting. Fill and drain valves on a manifold may be operated to add or drain water, respectively, in the cartridge. A sensor may indicate a water level in the cartridge. A controller may be connected to the sensor, and the fill and drain valves. A steam output capacity of the cartridge may be maintained at a predetermined magnitude by controlling the level of water with a controller. The cartridge may have one or more handles for easily inserting or removing the cartridge in a housing. The manifold may be installed in the drain pan for easier cartridge replacement. The humidifier device may be directly mounted on an air duct of a heating system or can be installed remotely.

Abstract: An engine includes an air filter assembly having a filter element and a case. A base of the case includes multiple clips, multiple pins, and a catch. The clips are configured to engage a bottom wall of the filter element. A cover of the case includes multiple hinge wings, a hook, and a guide structure. Each of the hinge wings is coupled with a corresponding pin of the base to allow the cover to rotate about the pins. The hook is configured to fasten to the catch of the base for securing the case in a closed configuration. The guide is configured to facilitate placement of the hook and prevent lateral slipping of the hook from the catch of the base. The base and the cover define an interior volume of the air filter assembly sized to receive the filter element.

Abstract: A bathing system with a molded shell has hollows in the shell. A module with internal water and air chambers is installed in each hollow with jets mounted upon the front jet plate of the module. The module is of simple construction that is mounted in a hollow and is removable and interchangeable for easy upgrading and repair of the bathing system.

Abstract: An adjustment safeguard for a set screw on a carburetor includes a cap held non-rotatably on the head of the set screw. The cap is surrounded by a coaxially positioned wall sleeve fixed to the housing. A rotation stop is fixed to the housing to limit the angle of rotation of the cap in the sleeve in the rotational direction of the set screw. A through-opening in the cap permits inserting a tool into an engagement opening in the head of the set screw to avoid destruction by introducing too much torque into the adjustment safeguard. The form and opening width of the through-opening is limited by the use of a metal material such that a tool larger than the adjustment tool is not able to be inserted through the through-opening into the head of the set screw. The engagement opening is flexible to limit a maximum allowable adjustment torque.

Abstract: A console humidifier includes a humidification unit having a top portion with an air outlet there through. A water reservoir is located at a bottom portion of the humidification unit, and includes an air inlet there through. A portion of the water reservoir extends through a back wall of the humidification unit and includes a water tank interface. A water tank is positionable on the water tank interface, where the water tank include support members for caring the load of the water tank. A wick element is located in the humidification unit, with only an end portion of the wick element being positioned in the reservoir. The wick element being positioned about the air inlet. A fan assembly is located in the top portion of the humidification unit, where the fan assembly is interposed between the wick element and the air outlet in the top portion of the humidification unit.

Abstract: The carbonation device includes a cap system selectively mounted to the mouth of a liquid container. The cap system includes a cap, a syringe piston reciprocable within the cap, an actuating mechanism for reciprocating the syringe piston, and a reaction vessel selectively attached to the bottom of the cap. The syringe piston includes a storage area to be filled with water by repeated activation of the actuating mechanism. The water from the charged syringe piston discharges into the reaction vessel that has been filled with a preselected amount of reactants to initiate the carbonation reaction. In an alternative embodiment, the carbonation device includes a rotatable control ring to selectively puncture a CO2 cartridge inside the reaction vessel or introduce water into the reaction vessel to initiate carbonation reaction. In both embodiments, the CO2 flows from the reaction vessel into the container to carbonate the beverage contained therein.

Abstract: A carburetor provided on an intake pipe is disclosed. The carburetor includes a rotary cock attached to a fuel chamber. The cock is used for opening and closing fuel channels and drain channels. The cock has a rotational axis inclined relative to the central axis of the intake pipe.

Abstract: An adjustment safeguard for a set screw that is rotatably held in a housing has a cap that is non-rotatably secured on the head of the set screw. The cap is received in a sleeve of the housing and surrounded with minimal radial play by the sleeve that is essentially coaxially positioned relative to the cap. The cap is received with its axial length in the sleeve. The cap has a projection and the sleeve has a stop arranged in the interior of the sleeve. Projection and stop interact with each other in a rotational direction of the set screw. The cap has a top part and a separate bottom part. The bottom part is secured axially and non-rotatably on the head of the set screw. The bottom part engages with form fit the top part in the rotational direction and is axially connected to the top part.

Abstract: A high-velocity water misting gun with a very high-speed radial inflow hydraulic turbine mounted on the same shaft with an axial flow air compressor wheel compressing air discharged at high velocities through an exhaust air nozzle. All of the water discharging from the hydraulic turbine wheel is channeled directly into a water misting nozzle providing a fine water mist discharging into a high-velocity air flow provided by the axial-flow compressor. Preferred embodiments utilize a manually operated ball valve to control water pressure supplied to the gun. A second valve is a manually operated turbine water bypass valve that is integral part of the preferred embodiment which allows for change of turbine power and air flow independently of water flow. With turbine water bypass valve open, most of the turbine flow is bypassed around the turbine and directly into the water misting nozzle, increasing the water flow and decreasing the air flow and air velocity.

Abstract: The present invention discloses a readjustment-preventing carburetor and a method for preventing the carburetor from being readjusted. The carburetor includes an idle adjusting screw having a concave neck, an idle port and a screw hole communicating with the idle port. The idle adjusting screw is joined with the screw hole as a whole after being adjusted to a certain position, and any further adjustment will cause the concave neck to be broken off to prevent the idle adjusting screw of the carburetor from being readjusted. Additionally, the idle adjusting screw is joined with the screw hole by bonding or welding, thereby fundamentally preventing anyone from readjusting the idle adjusting screw of the carburetor and ensuring the discharge of the gasoline engine always in conformity with the requirements of environmental protection. The carburetor and the method of the present invention have the characteristics of simple process and structure, safety use and reliability.

Abstract: A carburetor valve and limiter cap assembly for limiting adjustment of fuel flow in a carburetor may include a needle valve and a limiter cap. The needle valve may have a tip, a threaded portion, a head having a flange with an outer diameter greater than the rest of the head, and one or more serrations formed on the head. The limiter cap may have a sidewall, a tab extending outwardly from the sidewall, a first cavity having an inner diameter sized for an interference fit with the flange, and at least one driving feature to engage at least one serration so that rotation of the limiter cap causes rotation of the needle valve. The interference fit between the flange and the limiter cap inhibits removal of the limiter cap from the needle valve to prevent undesired adjustment of the needle valves by an end user.

Abstract: Multi-fuel carburetors and related methods are provided for a combustion engine. A multi-fuel carburetor can include at least two fuel nozzles for providing fuel from a fuel source to a carburetor barrel to produce a mixture of fuel and air. A fuel control device movable with respect to at least one of the fuel nozzles can be used to selectively adjust the amount of fuel that can be drawn through that nozzle, thereby desirably adjusting the air/fuel ratio of the mixture produced in the carburetor barrel.

Abstract: An adjustment limiting device for a carburetor including a fuel adjustment valve rotatable to adjust a supply of fuel in or delivered from the carburetor includes an adjustment limiting cap and a connector. The adjustment limiting cap is adapted to be disposed over a portion of the fuel adjustment valve and includes a rotary connection feature adapted to limit relative rotational movement between the adjustment limiting cap and the fuel adjustment valve, and a rotation limiter to limit rotational movement of the adjustment limiting cap. The connector may be carried by the adjustment limiting cap to maintain the adjustment limiting cap on the fuel adjustment valve. The connector may be concealed by the carburetor body, permit the adjustment limiting cap to be fitted onto the fuel adjustment valve, and prevent the adjustment limiting cap from being removed from the fuel adjustment limiting valve.

Abstract: An adjustment safeguard for a set screw that is rotatably held in a housing has a cap that is non-rotatably secured on the head of the set screw. The cap is received in a sleeve of the housing and surrounded with minimal radial play by the sleeve that is essentially coaxially positioned relative to the cap. The cap is received with its axial length in the sleeve. The cap has a projection and the sleeve has a stop arranged in the interior of the sleeve. Projection and stop interact with each other in a rotational direction of the set screw. The cap has a top part and a separate bottom part. The bottom part is secured axially and non-rotatably on the head of the set screw. The bottom part engages with form fit the top part in the rotational direction and is axially connected to the top part.

Abstract: A carburetor valve and limiter cap assembly for limiting adjustment of fuel flow in a carburetor may include a needle valve and a limiter cap. The needle valve may have a tip, a threaded portion, a head having a flange with an outer diameter greater than the rest of the head, and one or more serrations formed on the head. The limiter cap may have a sidewall, a tab extending outwardly from the sidewall, a first cavity having an inner diameter sized for an interference fit with the flange, and at least one driving feature to engage at least one serration so that rotation of the limiter cap causes rotation of the needle valve. The interference fit between the flange and the limiter cap inhibits removal of the limiter cap from the needle valve to prevent undesired adjustment of the needle valves by an end user.

Abstract: In one aspect, a steam humidifier is disclosed. The steam humidifier includes a tank for containing water to be heated to generate steam and a water connection manifold that has a manifold chamber in fluid communication with a water supply passage and a water drain passage. The steam humidifier further includes a rotary valve that is configured to control a fluid passage between the tank and the manifold chamber and that is further configured to control the position of one or more locking features. The rotary valve is rotatable between a first locked position and a second unlocked position. In the first locked position, the fluid passage between the tank and the manifold chamber is open and the one or more locking features are engaged with a structure of the steam humidifier. In the second unlocked position, the fluid passage between the tank and the manifold chamber is closed and the one or more locking features are disengaged from the structure of the steam humidifier. Other aspects are disclosed.

Abstract: A volatile material dispensing device is provided, including a reservoir containing a supply of any one of numerous volatile materials having an outlet port with attached tube through which the volatile material flows, a valve and valve adjustment mechanism to control the flow rate through the tube, a lower housing incorporating a pad to receive the volatile material, and a tear-off tab that initially seals the tube and prevents flow until removed by the consumer. Optionally, the device may include an active mechanism, such as a fan, to aid dispersal of the volatile material. The device gives the user control of the intensity of the vapor by providing the ability to adjust the flow through the valve with the valve adjustment mechanism. The device also provides constant vapor intensity over time with a time-release dispersing mechanism delivering a controlled, consistent flow, with an appropriate drip rate.

Abstract: In one aspect, a steam humidifier is disclosed. The steam humidifier includes a tank for containing water to be heated to generate steam and a water connection manifold that has a manifold chamber in fluid communication with a water supply passage and a water drain passage. The steam humidifier further includes a rotary valve that is configured to control a fluid passage between the tank and the manifold chamber and that is further configured to control the position of one or more locking features. The rotary valve is rotatable between a first locked position and a second unlocked position. In the first locked position, the fluid passage between the tank and the manifold chamber is open and the one or more locking features are engaged with a structure of the steam humidifier. In the second unlocked position, the fluid passage between the tank and the manifold chamber is closed and the one or more locking features are disengaged from the structure of the steam humidifier. Other aspects are disclosed.

Abstract: A fuel metering apparatus provides a carburetor; a fuel float control, a fuel metering assembly and a rocker arm assembly. The rocker arm is mechanically linked to and is operated by an accelerator pedal. Its position determines the size of a gap between a fuel metering tube and the metering piston, of the fuel metering assembly, to adjust a gap between the metering piston and a metering tube, which determines the precise rate of fuel flowing into the carburetor's air stream.

Abstract: A carburetor fuel adjustment assembly includes a low speed needle valve and preferably a high speed needle valve threaded into respective receptacles of a carburetor body. Each receptacle defines an elongated cavity which intersects a fuel passage and has a valve orifice or seat. Each needle valve has a shank which threadably engages the respective receptacles and a tip that extends into the axially-aligned orifice or seat. The tip is axially movable relative to the orifice by rotation of the needle valve to control the size of the opening between the valve and orifice for fuel flow. A resilient body cooperates with the valve shank in laterally biasing the tip into a steadfast position relative to the orifice or seat. The lateral bias assures constant area for fuel flow through the orifice by resisting needle movement until a sufficient torque is intentionally applied to the needle valve.

Abstract: A device for a power tool that includes an internal combustion engine and a carburetor for supplying an air and fuel mixture to the engine. The carburetor includes at least one externally adjustable component. An air filter arrangement of the device is for in-taking air, filtering the air, and directing the filtered air to the carburetor. The arrangement includes a housing. A tamper-resisting portion of the device extends from the air filter arrangement housing and extends adjacent to the location of the at least one adjustable component. The tamper resisting portion includes a segment that permits access to the at least one adjustable component along a first direction and limits access to the at least one adjustable component off of the first direction.

Abstract: A carburetor fuel valve adjustment and limiter assembly for a combustion engine limits the maximum and minimum fuel amounts delivered through the valve of the carburetor. A needle valve of the adjustment and limiter assembly cooperates with a collar and pin generally located axially inward of an enlarged valve head. The collar of the limiter assembly is arranged telescopically with a valve shaft and yieldably biased to lock to the head when moved in an axially outward direction. When locked, and upon rotation of the valve, first and second stops carried by the collar are arranged to bear on a stationary pin carried by a carburetor body. During manufacture, the collar can be pushed axially inward against the bias of a spring to disengage the collar from the head to permit rotation of the needle valve while the collar remains stationary for unlimited adjustment of the needle valve.

Abstract: In order to improve a limiter cap (300; 300?) for limiting the adjustability of at least two set screws or valves (200), which are arranged side by side, with each set screw or valve (200) including at least one retaining nose or stop leg (240), extending in the transition area between the screw head (210) and the screw needle or valve needle (220) in a ring shape around the external circumference of the screw needle or valve needle (220), in particular for limiting the adjustment of the fuel flow through a carburetor (400; 400?), in such a way that inadvertently pushing the limiter cap onto the screw needle thus prematurely blocking said screw needle, already at the time when the (basic) carburetor adjustment takes place, is safely prevented, it is proposed that the limiting cap (300; 300?) is attached to each of the set screws (200) in particular in a way so as to be self-attaching, and/or in particular such that the limiter caps (300; 300?) engage each other with locking action, and/or without any further

Abstract: An adjustment system for a carburetor of an engine places a housing structure around the head of an adjustment screw to inhibit access to the head of the idle fuel adjustment screw except by properly trained technicians who possess an appropriately shaped tool which allows this access. In this way, the housing can function as intended, to limit access by untrained personnel to the idle fuel adjustment screw, while not requiring that it be completely removed or destroyed in order to allow appropriate access by trained personnel.

Abstract: An apparatus for adjusting the air-fuel ratio of a fuel mixture to be supplied to an engine. The apparatus has a pair of needle valve bodies and a pair of receptacles formed in a main body of a carburetor for receiving the needle valve bodies. Each needle valve body has a needle and a head. The needles are axially movable relative to a respective needle orifice. The needles may be axially advanced and retracted by rotating the needle valve bodies within the receptacles to respectively decrease and increase the flow of the fuel mixture around the needles and through the orifices. To prevent tampering with the needle valve body setting, the head of the needle valve body has an unconventional shape requiring a specialized tool to rotatably adjust the needle valve body. To further prevent tampering, the head is recessed with the main body of the carburetor.

Abstract: To prevent the entry of ambient air and liquid such as rainwater into a direct acting type auto-by starter and thereby prevent the formation of rust in the auto-by starter, by adjusting pressure fluctuations in the auto-by starter caused by the operation of a starting valve for opening and closing a starting intake passage. A starting valve is lifted to open a starting intake passage to start an internal combustion engine. Pressure in a sliding space for the starting valve is increased, so that the gas in the sliding space flows out. The flow of the gas is absorbed by an increase in volume inside a bellows boot mounted on an upper portion of the starting valve. When the starting valve is lowered by the operation of a spring member, the pressure in the sliding space is reduced to allow the gas flow from the bellows boot into the sliding space.

Abstract: A carburetor including a main body and a throttle valve received in a mixing passage through the main body. The throttle valve is movable to adjust the quantity of a fuel and air mixture supplied to an engine. A carrier member on the main body has a threaded bore in which a shank of an idle speed adjustment screw is received to adjust and control the idle position of the throttle valve. The idle speed adjustment screw is formed of a polymeric material such that the shank is deformed by engagement with the threaded bore to reliably retain the idle speed adjustment screw in its adjusted position in the threaded bore.

Abstract: A tamper resistant mixture adjustment screw arrangement for a carburetor. The arrangement includes a carburetor body having at least one air/fuel adjustment screw threaded therein. The adjustment screw has a threaded shank and a head portion. The head portion is defined by a smooth top surface and an undulant, uneven side surface capable of being engaged and mated by an adjusting tool having a complementary undulant, uneven side surface capable of being engaged and mated by an adjusting tool having a complementary undulant, uneven surface for initially adjusting the air/fuel mixture in the carburetor. A blocking curb extends from the carburetor body to a level which at least substantially corresponds to a projecting extent of each adjustment screw and being closely spaced to the screw head to prevent the screw from being turned by commonly available tools, but to permit the screw to be adjusted by the adjusting tool.

Abstract: A carburetor including a main body and a throttle valve received in a mixing passage through the main body. The throttle valve is movable to adjust the quantity of a fuel and air mixture supplied to an engine. A carrier member on the main body has a threaded bore in which a shank of an idle speed adjustment screw is received to adjust and control the idle position of the throttle valve. The idle speed adjustment screw is formed of a polymeric material such that the shank is deformed by engagement with the threaded bore to reliably retain the idle speed adjustment screw in its adjusted position in the threaded bore.

Abstract: An elongated drain screw mechanism having a solid front end disposed in the fuel bowl of a carburetor. The mechanism has an intermediate section disposed in the bowl the intermediate section having at least one transverse opening into which fuel in the bowl can flow, and a rear section extending through the bowl to the outside of the bowl. The rear section has a hollow open end and has a longitudinal channel connected to the transverse opening and communicating with the hollow open end. A first quick disconnect coupler is disposed in and seals said open end of the rear section. The first coupler has a normally closed position which blocks fuel flow and can be placed in open position at which fuel can flow.

Abstract: A tamper resistant mixture adjustment screw arrangement for a carburetor. The arrangement includes a carburetor body having at least one air/fuel adjustment screw threaded therein. The adjustment screw has a threaded shank and a head portion. The head portion is defined by a smooth top surface and an undulant, uneven side surface capable of being engaged and mated by an adjusting tool having a complementary undulant, uneven side surface capable of being engaged and mated by an adjusting tool having a complementary undulant, uneven surface for initially adjusting the air/fuel mixture in the carburetor. A blocking curb extends from the carburetor body to a level which at least substantially corresponds to a projecting extent of each adjustment screw and being closely spaced to the screw head to prevent the screw from being turned by commonly available tools, but to permit the screw to be adjusted by the adjusting tool.

Abstract: A fuel-air mixture control apparatus for adjusting the mixture of fuel and air that a carburetor provides to an internal combustion engine. A mixing passage provides a fuel-air mixture to one or more combustion chambers of an internal combustion engine. A main fuel supply passage provides fluid communication between a fuel source and the mixing passage through a main fuel nozzle. An idle fuel supply passage provides fluid communication between a fuel source and the mixing passage through an idle fuel nozzle. An idle fuel ratio control valve adjusts the proportion of fuel drawn into the mixing passage through the idle fuel supply passage to the flow rate of air drawn into the mixing passage. The idle fuel supply passage is in fluid communication with the main fuel nozzle. Vacuum pressure induced by flow rates across the main fuel nozzle, which exceed a predetermined flow rate, precludes idle fuel flow into the mixing passage.

Abstract: A fuel-air mixture control apparatus for adjusting the mixture of fuel and air that a carburetor provides to an internal combustion engine. A mixing passage provides a fuel-air mixture to one or more combustion chambers of an internal combustion engine. A main fuel supply passage provides fluid communication between a fuel source and the mixing passage through a main fuel nozzle. An idle fuel supply passage provides fluid communication between a fuel source and the mixing passage through an idle fuel nozzle. An idle fuel ratio control valve adjusts the proportion of fuel drawn into the mixing passage through the idle fuel supply passage to the flow rate of air drawn into the mixing passage. The idle fuel supply passage is in fluid communication with the main fuel nozzle. Vacuum pressure induced by flow rates across the main fuel nozzle, which exceed a predetermined flow rate, precludes idle fuel flow into the mixing passage.

Abstract: A tamper resistant mixture adjustment screw arrangement for a carburetor. The arrangement includes a carburetor body having at least one air/fuel adjustment screw threaded therein. The adjustment screw has a threaded shank and a head portion. The head portion is defined by a smooth top surface and an undulant, uneven side surface capable of being engaged and mated by an adjusting tool having a complementary undulant, uneven side surface capable of being engaged and mated by an adjusting tool having a complementary undulant, uneven surface for initially adjusting the air/fuel mixture in the carburetor. A blocking curb extends from the carburetor body to a level which at least substantially corresponds to a projecting extent of each adjustment screw and being closely spaced to the screw head to prevent the screw from being turned by commonly available tools, but to permit the screw to be adjusted by the adjusting tool.

Abstract: A rotary throttle valve carburetor includes an air intake passage and a throttle valve bore formed in a carburetor body, a cam disposed in the throttle valve bore, and a throttle valve disposed in the throttle valve bore so that one end engages the cam and th other end is accessible from outside the throttle valve bore for operable connection to a throttle valve lever. The carburetor may also have a cable holder with a receiving cylinder for an outer tube of a throttle valve lever cable, an insert port for an inner wire of the cable and a slot between the receiving cylinder and insert port. The slit is smaller than an end of the inner wire to prevent that end from passing through the slit. The carburetor may further include a tamper resistant fuel adjustment bolt including an anti-turning body keyed to the carburetor body and splined to the adjustment bolt after calibration of the carburetor to prevent inadvertent rotation, or user tampering with the calibrated setting.

Abstract: An apparatus for adjusting the air-fuel ratio of a fuel mixture to be supplied to an engine. The apparatus has a needle valve body and a receptacle formed in a main body of a carburetor which receives the needle valve body. The needle valve body has a needle and a head. The needle is axially movable relative to a needle orifice. The needle may be axially advanced and retracted by rotating the needle valve body within the receptacle to respectively decrease and increase the flow of the fuel mixture around the needle and through the orifice. To prevent tampering with the needle valve body setting, the head of the needle valve body has an unconventional shape requiring a specialized tool to rotatably adjust the needle valve body. To further prevent tampering, the head is recessed with the main body of the carburetor.

Abstract: A bubble generator is constructed to include a cylindrical casing, a tapered tube suspended in a front open side of the casing and adapted for guiding water into the casing, the tapered tube having recessed holes on the inside adapted for causing a negative pressure when water passing through the tapered tube into the inside of the casing toward the water outlet, a rod member axially slidably inserted through a rear closed side of the casing into the inside of the tapered tube, and a stopper fixedly fastened to the rod member and moved with the rod member to adjust the gap between the stopper and the tapered tube.

Abstract: A process for adjusting carburation in a bowl-type carburetor having a main fuel jet for directing fuel to be mixed with air includes moving a needle into and away from the main fuel jet orifice. The needle is threadably inserted through a bowl plug of the carburetor, and moved into and away from the main fuel jet orifice by manually actuating a knob operably associated with an end of the needle extending from the carburetor, allowing the adjustment of carburation without carburetor disassembly, and even while the vehicle is moving.

Abstract: A process for adjusting carburation in a bowl-type carburetor having a main fuel jet for directing fuel to be mixed with air includes moving a needle into and away from the main fuel jet orifice. The needle is threadably inserted through a bowl plug of the carburetor, and moved into and away from the main fuel jet orifice by manually actuating a knob operably associated with an end of the needle extending from the carburetor, allowing the adjustment of carburation without carburetor disassembly, and even while the vehicle is moving.

Abstract: A carburetor for an internal combustion engine is provided and includes at least one adjusting screw disposed in a housing for regulating the fuel/air mixture. The adjusting screw is screwed into a bore of the carburetor housing. The adjusting screw is embodied as a cheese head screw, whereby one end of the screw is provided with two slots that are cross-shaped relative to one another and extend over the diameter of the cheese head screw.

Abstract: A fuel needle valve assembly of a carburetor has a retainer which yieldingly restrains the rotational fuel flow setting capability of the needle valve. The retainer engages a shank of the needle valve and a parallel shaft, both of which project from the carburetor body. The retainer exerts a force which laterally displaces the projecting shank with respect to the shaft. The retainer has sufficient strength to ensure the factory set rotational setting of the fuel needle valve does not alter when a limiter cap is press fitted to a distal head of the needle. Furthermore, wherein the shaft is also a shank of a second needle valve, the same retainer laterally displaces the projecting shanks of both needle valves.

Abstract: A carburetor fuel mixture adjustment assembly has a threadable holder which suppresses rotation of a needle valve body disposed within an elongated receptacle defined within a carburetor body. The threadable holder is rigidly engaged within a threading chamber of the receptacle. During assembly, the needle valve body is extended through a bore of the holder as a threading portion of the valve body rotateable cuts an interior threading groove into the threadable holder. The threadable holder is held rigidly within the threading chamber by the carburetor body. A sealing holder is disposed within the receptacle axially inward of the threadable holder and is prevented from rotating within the receptacle by the threadable holder. A stem holder portion of the sealing holder assures a needle portion of the needle valve assembly remains concentrically disposed within an outlet orifice of a fuel chamber of the receptacle.

Abstract: A limiter cap assembly of a carburetor for a two cycle engine restricts maximum and minimum fuel amounts. The limiter cap assembly has a first cap engaged telescopically to the end of a low speed needle valve and a second cap engaged telescopically to the end of a high speed needle valve. The first and second caps are identical, each having a first tab and a second tab. The first tab sets the maximum fuel amount by contacting the adjacent cap and the second tab sets the minimum fuel amount by also engaging the adjacent cap. The first and second tabs are axially spaced apart so as not to obstruct rotation of the adjacent cap via the adjacent tabs. A housing having a lid encompasses the first and second caps. The caps each have a plurality of projections which engage an inner edge of the lid, thereby, provisionally staging the caps to the carburetor while final needle valve adjustments are made.

Abstract: A fuel needle valve assembly of a carburetor has a retainer which yieldingly restrains the rotational fuel flow setting capability of the needle valve. The retainer engages a shank of the needle valve and a parallel shaft, both of which project from the carburetor body. The retainer exerts a force which laterally displaces the projecting shank with respect to the shaft. The retainer has sufficient strength to ensure the factory set rotational setting of the fuel needle valve does not alter when a limiter cap is press fitted to a distal head of the needle. Furthermore, wherein the shaft is also a shank of a second needle valve, the same retainer laterally displaces the projecting shanks of both needle valves.

Abstract: A fuel needle valve assembly of a carburetor has a retainer which yieldingly restrains the rotational fuel flow setting capability of the needle valve. The retainer engages a shank of the needle valve and a parallel shaft, both of which project from the carburetor body. The retainer exerts a force which laterally displaces the projecting shank with respect to the shaft. The retainer has sufficient strength to ensure the factory set rotational setting of the fuel needle valve does not alter when a limiter cap is press fitted to a distal head of the needle. Furthermore, wherein the shaft is also a shank of a second needle valve, the same retainer laterally displaces the projecting shanks of both needle valves.

Abstract: A carburetor fuel mixture adjustment assembly including a threaded cylindrical needle valve receptacle formed in a carburetor main body and intersecting a fuel passage. A needle valve body is threaded into the needle valve receptacle and includes a needle that extends into an axially-aligned needle seat orifice portion of the fuel passage. The needle is axially movable within the needle seat orifice by rotation of the needle valve body to control how much of the orifice is open to fuel flow. A valve spring disposed between a head of the needle valve body and the carburetor main body biases the head away from the carburetor main body. A needle stabilizer engages and cooperates with the valve spring in laterally biasing the needle into one position relative to the needle seat orifice. The lateral bias assures constant fuel flow through the orifice by resisting needle movement.

Abstract: A carburetor body including a cylindrical bore, a frusto-conical stepped shoulder portion, a valve chamber and an outlet passage which are coaxially provided and sequentially reduced in the inner diameter inwardly from an end wall face thereof. A plastic retainer and a metal collar are interference fitted into the cylindrical bore. The fuel regulating needle valve includes a screw shaft portion, an unthreaded stem portion and a valve tip which are sequentially reduced in the outer diameter from a head of the fuel regulating needle valve toward the valve tip. The threaded shaft portion is screwed into a threaded bore formed in the metal collar, and at the same time, screwed into an axial bore formed in the plastic retainer while cutting thread grooves. The unthreaded stem portion projects from a distal end cylindrical portion of the plastic retainer into the valve chamber, and the valve tip projects from the valve chamber into the outlet passage.

Abstract: A cover is installed over an engine adjuster such as a carburetor adjustment screw. This cover is in the form of a cap having a flat top with a frangible brim portion. The cap is installed in a housing for the adjustment device, in a recess directly above the adjustment device. An inner rim is formed on the cap beneath the flat top with a recessed portion being formed between the top and the rim. The inner rim of the cap matingly engages a rim which may be formed in the top portion of the adjuster or in a housing surrounding the adjuster and snaps into place joined to either the adjuster or its housing. An anti-pry protective washer or shoulder is provided in the housing. This anti pry device is positioned in close proximity to the outer wall of the inner rim of the cap in a manner to prevent prying instruments from reaching under the inner rim in an attempt to remove the cap.

Abstract: A carburetor fuel mixture adjustment assembly has a threadable holder which suppresses rotation of a needle valve body disposed within an elongated receptacle defined within a carburetor body. The threadable holder is rigidly engaged within a threading chamber of the receptacle. During assembly, the needle valve body is extended through a bore of the holder as a threading portion of the valve body rotateable cuts an interior threading groove into the threadable holder. The threadable holder is held rigidly within the threading chamber by the carburetor body. A sealing holder is disposed within the receptacle axially inward of the threadable holder and is prevented from rotating within the receptacle by the threadable holder. A stem holder portion of the sealing holder assures a needle portion of the needle valve assembly remains concentrically disposed within an outlet orifice of a fuel chamber of the receptacle.

Abstract: A carburetor for an internal combustion engine of a hand-held working tool has a housing having an intake channel and a fuel-filled control chamber mounted in the housing. A fuel channel is connected to the control chamber and the intake channel. A control valve is mounted in the fuel channel and has a valve member. A control screw is mounted in the carburetor housing and acts on the valve member for adjusting it. A cap is fixedly mounted on the control screw and has a stop. A counter stop is mounted on the housing in a rotational path of the stop of the cap. A locking device for securing the cap relative to the housing is provided. The locking device has a locking member and counter locking members cooperating with the locking member for locking the cap in one of various preset positions relative to the housing.